SU1217910A1 - Method of producing ferrotungsten from tungsten concetrates - Google Patents

Description

The invention relates to ferrous metallurgy, in particular to the production of ferro-sacks.

The purpose of the invention is to increase the speed and degree of refining ferro-tungsten from impurities, intensifying the process of restoring shpak while simultaneously increasing the total concentration of manganese in nepepa6aTbmaeNajx concentrates and increasing furnace productivity, expanding the raw material base and reducing tungsten loss.

After scooping the ferro-tungsten, before refining the spike, the melt is prepared by periodical batch loading onto the surface of the melt and melting a mixture of high-manganese wolframite concentrate with MhO / iNO Oj2 ratio in it with silica and iron oxides at a ratio in the mixture of tungsten trioxide to silica and iodine and silica, and silica and fused silica with a silica ratio in the mixture of tungsten trioxide and silica in it. equal to 1: (0.8–1.3): (0.3–0.5) and the amount of high manganese wolframite concentrate 5–20% of the concentrate given for smelting in its other periods, with a constant uniform behind manual ultrasonic inspection of the entire surface of a melt during its preparation period and coke fines mixture of ferrosilicon when sootioshenii 1: (1,75-3) and an amount of coke fines from 25-45% in other periods specified by melting.

As high manganese wolframite concentrate By considering MnO / WOj: 0.2, it uses intermediate products of high-manganese wolframite ores with a content of WO 30-45%, S lOjj, 60-45%, and set them for smelting during the preparation of the melt in a mixture with iron oxides at the total ratio in a mixture of tungsten trioxide 1m to silica and iron oxides, providing a given ratio of 1: (0.8-1.5): (0.3-0.5).

The process of preparing the melt is carried out by introducing the surface of the melt remaining after scooping out the ferrunolfram periodically in 100-150 kg of a mixture of highly margarous tungsten concentrate with a ratio of Mcr / 4 (0, 2 with silica and iron oxides. Ratio in the mixture of trioxide carbon oxide to silica and to

to

17910

iron oxide 11 (0.8-1.5) :( 0.3-0.5) and when the amount of high-manganese tungsten concentrate is 5-20% by weight of the calculated concentrate for the remaining periods of melting. At the same time, a mixture of coke and ferrosilicon is set on the surface of the melt at their ratio I: (1.75-3) and the amount of coke is 25-45% of that calculated for the remaining melting periods. A mixture of coke and ferrosilicon is set uniformly over the entire surface of the melt over the course of the entire melt preparation operation.

As a high manganese wolframite concentrate, for example, wolframite hubn (erite concentrate with a content of 60-65% WO, and up to 22% Mg, 0) are used. As silica, silica sand is used.

15

20

taking into account the content of QiOg in the final citrate. Iron ores are used as iron oxides, the amount of which is also specified based on the iron content of the concentrate in the sand. As coke, pecox fines of fractions less than 10 mm are used. Ferrosilicon use lee-.

bo granulated or crushed to fractions less than 10 mm.

When the oxide melt is loaded on the surface, which by this period contains about all the components of a mixture of a wolframite concentrate, silica and iron oxides dissolve in it.

Upon contact of the components of the mixture with coke, which, by virtue of its

low density compared with slag floating on the surface of the melt, is the restoration of tungsten and iron from their oxides. MnO Hubnerite (,) in the presence of large contents of free Si Оj forms a strong low-melting compound MnO-SiOg with Tpl.1291 ° C, which contributes to the liquefaction of slag. In the presence of large contents

Manganese is practically not reduced in the FeO melt. Ferrosilicon, having a density of greater density, is melted, in contact with the reduced

tungsten and iron and forms

fusible (with Tpl. 1600 ° C) alloy with increased due to them density, which settles on the surface of

3

fusible metal bottom. Simultaneously with the process of droplets of this alloy, the reduction of tungsten and iron in the volume of the melt with silicon occurs. The silica produced in this process also contributes to the formation of a durable MnObN, and silicon associated with silicides with tungsten and iron enhances the activity of manganese, due to which the reduction of manganese does not occur practically in these layers of the slag melt.

The process is accompanied by active removal of CO, so that a layer of slag foam is formed on the surface, preventing heat loss through the throat and contributing to the intensive process of reducing tungsten and iron.

Batch periodic introduction to the surface of the melt (100-150 kg portions) of a mixture of concentrate, silica and iron oxides prevents deep penetration of tungsten and manganese oxides given with the mixture into the volume of the melt, which ensures the passage of reduction reactions from the injected concentrate and iron oxides in the upper layers of the oxide melt, and the uniform constant supply of the reducing mixture of coke and ferrosilicon ensures a constant intensity of the reactions in these layers and the extraction nnyh components from the reaction zone to ensure completeness of the reaction toward the formation of MnO SiOg sufficient fullness and transition manganese oxide phase.

A simultaneous increase in the oxide melt concentration of Si Og, and in the surface layer of the liquid metal phase, the concentration of silicon increases the activity of carbon and manganese, which remained in the metal before the period of preparation of the melt, which contributes to their transition to the oxide phase. The increased concentration of silicon in the liquid metal layer also contributes to a decrease in the solubility of sulfur in it, which also passes mainly into the oxide phase.

Increasing the concentration in the slag phase of SiOg and reducing the concentration as a result of reduction of FeO

25

17910

reduces the adhesion of the slag to the metal, which contributes to the enlargement of the reduced droplets (their coalescence) and the completeness of their precipitation.

5 The process of transition of MpO to the oxide phase in the form of a MnO-SiOj compound is the more intense and more complete the better the contact of these oxides. From this point of view, the most optimal

10 will be those mixtures of wolframite concentrates and silica in the required ratio, in which these oxides are located closest to each other. The most optimal in this sense

15 are the intermediate products of the enrichment of wolframite ores with thin germination of wolframites and quartzites, such as, for example, concentrates containing.,%: VJ OJ 35-40%; MPO

20 to 15; Si 0 36-40; iron oxides and impurities else.

Use to prepare a melt mixture of such a concentrate with iron oxides, providing the same ratio of tungsten trioxide, silica and iron oxides 1: (0.8-1.5) :( O, 3-0.5).

The duration of the melt preparation operation, depending on the amount of the specified high-manganese rolframite concentrate (5-20% of the amount of concentrate set in other periods) is 20-40 minutes.

After completion of the melt preparation operation, the reattachment of the spike is carried out. During this period, unlike the prototype method, only ferrosilicon is introduced over the entire surface.

The preparation of the melt carried out before the re-reduction promotes the removal of the main mass of tungsten and iron from the oxide phase. The richest in content of these components of the oxide melt remains slag foam, in which, due to the developed surface and kinetic difficulties, the oxides remain unresolved. With the introduction of ferrosilicon (without coke) on the surface of the melt, the foam is destroyed and the tungsten and iron remaining there are reduced. At the same time, during the movement of ferrosilicon, through the slag layer, these oxides are redressed (which did not have time to recover during the preparation

melt) from the volume of slag. In this case, the release of BJOg contributes to

thirty

35

40

45

50

55

evolution, which prevents the recovery of manganese. Drops of ferrosilicon, Acting as a precipitator, remove the remaining (reduced) metal from the slag. The low melting point of the slag and its significant overheating under the slag foam layer contribute to the high rate of precipitation of the molten metal droplets.

Due to the withdrawal of the main mass

recoverable items from

During the preparation of the charge phase, the periods of redevelopment and suspension are reduced for the deposition of metal droplets. It has been experimentally established that in this case, the optimal recovery time is 35-40 minutes instead of 80 minutes required to produce waste slag according to the prototype method, i.e. The introduction of the melt preparation operation not only does not delay the total duration of melting, but even shortens it. At the same time, the amount of wolf ramite concentrate per smelting is increased by the amount specified with high manganese tungstate, and the total melting time is reduced.

After dropping the metal drops on the surface of the metal ingot, a formed layer of liquid metal containing up to 30% iron and the same amount of silicon remains. The content of manganese in the melt does not exceed 0.2%, carbon is 0.05%.

Depleted shpak with a content of less than 0.2% is released from the furnace and then begins the period of metal refining by successively melting tungsten-containing waste, heating the melt and batch filling and melting the blended tungsten concentrate with the ratio of ICO / X, 2 with simultaneous addition of coke to melt

1 &} the amount of carbon to be supplied with coking during the refining period is insignificant. The coking is set only to support slag foaming, which contributes to good heating of the melt. Therefore, carbon reduction occurs only in an insignificant part of tungsten oxides (iron and manganese are practically not recovered during this period). But

/five

20

179106

Tungsten is intensively reduced by silicon of the surface liquid metal layer. In this case, the metal is saturated with tungsten. Since the content of manganese and carbon is insignificant in the liquid metal melt 5 on the surface of a solid metal ingot (i.e. there is no need to refine the most 10 difficult refined components), the refining time is shortened, which is a reserve for increasing the furnace productivity of the processed concentrate. Experimentally established the required refining duration to obtain ferro-tungsten with a regulated silicon content (not higher than 0.8%), which does not exceed 250 minutes together 270 minutes according to the prototype method (for the amount of a given tungstic concentrate during this period is 6 tons).

After refining, ferro-tungsten is scooped out of the furnace. At the same time, a wolframite concentrate is simultaneously batch-filled (with the same ratio as in the refining of j and KOKSIK. The amount of coke here is greater than in the refining

The SRI, since it is the only reducing agent during this period. Simultaneously with tungsten, iron is reduced, and since the conditions for the formation of MnO SiOj during this period are insufficient (an insignificant amount of SiO and PeEO coming from the concentrate, and the reduced metal phase, due to the dispersity of the reduced particles and the absence of a precipitator, ferrosilicon is not rapidly removed from the reaction zone) , then the manganese is partially reduced. At the same time, the carbide formation process also takes place. Reduced manganese and carbon with carbide transfer to ferro-tungsten. However, the content of carbon and manganese in ferro-tungsten, due to the previously performed melt preparation operation, does not exceed the regulated requirements for ferro-tungsten. The resulting ferro-tungsten meets the requirements of standards (respectively, manganese is less than 0.6% and carbon is less than 0.7%),

If high-manganese tungsten nitrate is introduced onto the surface of the melt during its preparation without a mixture of silica and iron oxides or without one of these components, as well as introducing the mixture at the ratio of tungsten trioxide to silica and iron oxides greater than 1: 0.8: 0.3 , then: there is a place for the additional reduction of manganese, which leads to a delay in smelting and the possible production of ferro-tungsten with M content above regulated limits.

At a ratio of 0, Si Og and iron oxides in the mixture than 1: 1.5: 0.5, the putty is obtained as high-silicon, viscous, which impairs the kinetics of VJ and P reduction and decreases the rate and completeness of precipitation of metal drops from pshak, and this leads to inhibition of the smelting process, reduced furnace performance and increased loss of tungsten with slag. The same will be observed if the amount specified with a mixture of high-manganese concentrate is more than 20% of the concentrates specified in the remaining periods of melting. If this concentrate is reduced to less than 5% of that set in other periods of smelting, the problem of increasing the total concentration of manganese in the processed concentrates and increasing the furnace productivity both in the processed concentrate and in the resulting ferrofluteness is not solved.

If a mixture of concentrate, silica and iron oxides is placed on the surface of the melt by a one-time single charge, the components of the mixture are melted and mixed in the entire volume of the slag melt, which leads to difficulties in the reduction processes, delaying the smelting and reducing the productivity of the furnace . In addition, an excess of coke will occur in the upper layers of the melted slag, which will entail the inevitable reduction of manganese.

When the ratio of coke and ferrosilicon is more than 1: 1.75, the amount of ferrosilicon is not enough to completely precipitate the reduced metal droplets and flow to 0.

processes in the deep volumes of the slag melt, which will necessitate a prolongation of the regeneration period and a decrease in the productivity of the furnace. In addition, the reduction products will be poorly removed from the reduction zone, which will worsen the passage of the MnO-SiOj formation reaction and will contribute to the reduction of manganese.

A ratio of coke to ferrosilicon of less than 1: 3 only leads to an increase in the consumption of ferrosilicon and a subsequent increase in the duration of refining of ferro-tungsten without increasing the effect of removing the reduced metals from the reaction zone. This will reduce the performance of the furnace.

The amount of coking, specified in a mixture with ferrosilicon during the preparation of the melt, was determined experimentally and was regulated by the necessity of completing the reduction of tungsten and iron without reducing manganese and forming carbides. In this case, the coking is set in quantities proportional to the amount

Q of the assigned high-manganese wolframite concentrate: a smaller amount of concentrate corresponds to a smaller amount of coke (and, therefore, a mixture of it with ferrosilicon), and to a larger one, more. Less than 25% of the amount specified in the remaining periods), the amount of coke is not enough, to complete the restoration of tungsten and iron, which leads to a delay in the completion of

0

five

0

five

innovations, which means lower kiln performance, more (more than 45% of the time specified in other periods) is unnecessary, since it will contribute to the restoration of manganese and the deterioration of the quality of ferro-tungsten.

If a mixture of coke and ferrosilicon set on the surface of the melt

At the same time, the ferrosilicon will be lowered already in the initial stage of preparation of the melt on the furnace hearth, in the surface layers there will be a heavy excess of coke, which will lead to the recovery of manganese and its transfer to the metal. Therefore, the mixture should be given evenly throughout the entire melt preparation operation.

9

When used as a high-manganese wolframite concentrate of enrichment products of wolframite ores with a content of 30-45% O, additional supplementary operations of enrichment of intermediates are eliminated, at which tungsten is inevitably lost. The same operation becomes necessary to obtain products with a WC content of more than 45% WC.

If to use semi-products with content of Oj less than 30% on. remelting will receive a significant amount of ballast components, which will cause an increase in slag multiplicity and an increase in the loss of wolf

;frame.

The content of silica in the used products above 45% leads to an increased content of StOg in the donkeys, the slags become viscous, which worsens the kinetics of the reduction of the components of the charge and reduces the rate of extraction of the reduced elements from the slag, i.e. leads to a slow down of the smelting process and a decrease in the productivity of the furnace.

With a decrease in the silica content in intermediate products less than 36%, the amount of ballast additives introduced into the melt with the intermediate product increases, which causes an increase in the output of the spackle, and consequently, loss of tungsten, and increased power consumption for melting the ballast additives.

Smelting ferro-tungsten according to the proposed technology with the introduction of high-manganese tungsten concentrates partially with the MnO / WO ratio of 0.2 allows to increase the total manganese concentration in the processed concentrate without reducing the quality of ferro-tungsten produced in terms of margarica and other harmful components, to increase furnace productivity in the production of ferro-alframe - up to 23%, and in the case of using intermediates with the content of WO,. 30-45% to eliminate their additional processing and the loss of the leading element - tungsten.

The invention is as follows.

Experimental melting was carried out on an industrial rotating electric arc furnace with a transformer power

1010

3.5 MB A, on mixed wolframite concentrates obtained by mixing, concentrates KVG fT), KVG (KUi KVG-2 according to GOST

213-73. The composition of the synthesized concentrate for smelting,%: WjO 63.5; MnO (MnO / WO, 0,2) - 12.7; Si Oj 4.3;

| eo 6.8.

For experienced use

also additionally (on the operations of preparation of the melt) high-manganese concentrate of the brand KVG (t) with a content of 64.8; MpO 18.2 (MCU / WO ratio, 0.28); FeO 1.65;

Si Oj 4.6, and for melting with the use of high-manganese tungsten semi-finished product, the complex of brand KVK according to TU 48-5606-3 / 0-84 with content,%: NO, 38.4; MPO 11.5

(Ratio 0.3; F eO 0.25; 5; 0i 36.8; S 1.8.

As coke, the peck-coke breeze of the PKM-2 brand of fractions less than 10 mm with ash content was used.

2.3%. Ferrosilicon for melting using granulated fractions less than 10 mm of grade FS 65F with a silicon content of 68.5%, iron 31%. Dried low-phosphorus iron, low-phosphorus iron ore with an iron content of oxides of 61.4% was used as iron oxides; 0.7%; f 0,015%, as silica - dry quartz sand of class 1k with a content of 98.3% SiO; 0.4% FeO.

For batches used; also tungsten-containing wastes: ferro-tungsten chips, spackle from spoons, gas cleaning dust, as well as spent Le chisels, containing 95.4% iron, 4.1% tungsten.

Experimental smelting using the tested technology was carried out in three variants on a weight of shchitovanny tungsten mite concentrates (MpO / LO ratio 0.2) 8000 kg with the introduction of a high manganese concentrate mixture of VGH (T) mixture with quartz sand and iron ore at the operation of preparing the melt tungsten, silica and iron oxides in a mixture of 1: (0.8-1, 3b (0.3-0.5) and with amounts of concentrate KVG (T) 5 up to - 20% by weight of a given shchitovannogo concentrate in other periods of melts ( 400-1600 kg) at a constant

eleven

uniform loading on the entire surface of the melt a mixture of pekokoksovoy fines with ferrosilicon within the ratios G: (1.75-3) and with the amount of pekoksoksovoy fines in the amount of 25-45% of the melts set for the remaining periods.

Melting in version 1 was carried out in the following manner. After releasing the donkey from the furnace, cleaning and filling the bath and bypassing the electrodes, the furnace was turned on and loaded with tungsten-containing waste: 500 kg of ferro-tungsten chips, 230 kg of slag from spoons and gas cleaning dust and 815 kg of spent roller bits. The waste was smelted at the maximum power consumption of the transformer, swept over for 30 minutes and began to load 300 kg of batches of sewed concentrate with simultaneous loading of coke-coke breeze. In total, over this period (refining), 6,000 kg of shchitovanny concentrate and 200 kg of pecoke coke were loaded.

The end of the refining period was determined by the characteristic boiling of the bath. The readiness of ferro-tungsten (according to the content of silicon carbon and manganese) was evaluated visually by the selected sample from the furnace.

Then, while the bath rotated, the furnace was used to scoop the ferro-tungsten. During this period, another 2,000 kg of dried concentrate were loaded in portions of 100 k and an additional 300 kg of coke-coke breeze was introduced. The scooping was carried out at a reduced power of 25%, reducing the current load to prevent the overheat of the spike, in order to reduce the degree of manganese recovery.

After termination of ferro-tungsten, the melt was prepared. Periodically, portions of 100 kg were loaded onto the surface of the melt with high-manganese concentrate of the brand KVG (T) mixed with quartz sand and iron ore at a ratio of 1: 0.8: 0.3 in the mixture of tungsten trioxide, silica and iron, setting the concentrate to 5 % of a given blend concentrate for refining and scooping. In total, 400 kg of KVG (t) concentrate, 192 kg of quartz sand and 117 kg of iron ore were assigned for the operation of preparing the melt. In the same

I7910 2

the time was constantly uniformly throughout the whole operation of preparing the melt on the surface of the melt was given a mixture of pekoksokovoy fines and ferro

5 silicon at a ratio of 1: 3 and the amount of pecoke breeze in the amount of 25% of the amount specified during the refining and | scooping of ferro-tungsten (125 kg peck coke briquette and 375 kg of ferrosilicon).

After completion of the melt preparation, a pre-reduction was carried out. Dovostoyanie led ferrosilicium, which was asked, evenly throughout

15 surface melt. After completing the re-recovery, a 10-minute melt was spent to precipitate droplets of metal from the slag, during which the selected sample visualized the readiness of the spike for release, then cut the tap, released the slag, refilled the furnace bath, reloaded the electrodes and started the next melting.

25 Since the proposed melt preparation operation is carried out at the end of smelting and influences the duration of refining ferro-tungsten of the next smelting, then in order to evaluate the operations carried out on this variant (as well as on all subsequent variants of the smelting according to the proposed technology and prototype), that the variant characterizes melting in terms of the duration of the periods and the number of loaded materials, starting with the third, in which the regime is completely established. At the same time, the first melts served as a guideline for adjusting the spent roller cone bits (iron-containing material) assigned to melting to obtain ferroflux of the required composition for the content of tungsten

45 ma (72-76%). .

Parameters of the third smelting of option 1 are as follows: the duration of refining of the metal is 240 minutes; the duration of scooping the ferro

50 tungsten 70 min; melt preparation time 20 min; the duration of the recovery of the shpak is 35 min; duration 10 minutes; duration of the section-

55 years of slag production, furnace bath filling and electrode bypass 50 min; total melting time 425 min; number of sharoshech35

40

13

nk bits, set to melt 800 kg; the amount of ferrosilicon given on the addition of a shpak 135 kg.

The amount of charge materials per third smelting of option 1 and its characteristics are presented in Table 1, the characteristics of the smelting products and process indicators are given in Table 2. In Tables 1 and 2, the extraction of tungsten is shown by slag (the ratio in pshak to the total VJO given for smelting with concentrates), and the productivity - by processing for smelting MO, since these parameters by concentrate (productivity) due to the introduction of concentrates of different the composition of the smelting is not indicative, and show them on the obtained ferro-tungsten (extraction and productivity is not possible because TorOj) when scooping metal melting can partially go from previous melting to subsequent.

Melting for option 2 was carried out according to the same technology. The variation of the variant was that in the process of preparation, a mixture of KVG concentrate (t), quartz sand and iron ore was set to the melt surface with a ratio of tungsten trioxide, silica and iron oxides of 1: 1.15: 0.4 when the amount of VCG concentrate (T ) 1000 kg (12.5% of the amount specified in the remaining periods of the shrinked wolframite concentrate, and the mixture of coke-coke breeze and ferrosilicon at a ratio of 1: 2.2 and the amount of the coke-coke breeze was 35% of the time specified in the other periods. 711 kg of quartz are loaded of sand, 398 kg iron ore, 175 kg coke-pitch fines, 385 Kg of ferrosilicon. otrbotannyh number of roller bits for smelting and ferrosilicon at dovosstanovle- of slag (the third embodiment melting) was respectively 725 kg and 155 kg.

Melting for option 3 was performed in the same way, but when the ratio in a mixture of tungsten trioxide silica and iron oxides was 1: 1.5: 0.5 and the amount of concentration of KVG (t) for preparation of the melt was 1600 kg (20% of the specified -

ten

wolframite concentrate), and in a mixture of coke-coke breeze and ferrosilicon at a ratio of 1: 1.75 and the amount of coke-coke

trifles for the preparation of the melt 45% of the specified in the other periods of melting. In total, 1507 kg of quartz sand, 803 kg of iron

ORE 255 kg of pekokokskoi fines, 394 kg of ferrosilicon. The number of spent roller bits for smelting and ferrosilicon for the completion of slag removal (for the third smelting

option) was respectively 570 kg and 185 kg.

Melting option 4 was carried out. Similarly melting options 1-3, but as a high-manganese tungsten concentrate used intermediate (concentrate ICC Ratio set in the preparation of the melt mixture (concentrate

KVA rata and trioxy-dz iron ore. tungsten, silica and iron oxides 1: 0.954: 0.36. The amount of the ICC concentrate set for the operation was 1000 kg (12.5% of the set for smelted tungsten concentrate). The ratio of peck coke breeze and ferrosilicon for the operation of preparing the melt is 1: 2.586, the amount of a given coke coke breeze is 29% of that set for the rest of the heat. Altogether, 222 kg of iron ore, 145 kg of coke-coke breeze, and 375 kg of ferrosilicon were asked for the operation to prepare the melt. The number of waste cone bits for smelting and

ferrosilicon on the restoration

slag (for the third smelting option) was respectively 775 kg and 140 kg.

Melting of the prototype (variait 5 / carried out on the same batch materials (shchitovanny wolframite concentrate, pekokoksovskaya fines and ferrosilicon), as smelting options 1-4. The total amount of shchitovannogo concentrate, set for grinding (for refining and scooping ferro tungsten) was adopted this is the same - 8000 kg. The preparation of the melt in the smelting of this option was not carried out. The slag was completely re-reduced on a mixture of pekoksokovoy fines and ferrosilicon, the amount of which is melting

15

respectively 100 kg and 480 k, respectively. The number of used roller cone bits for smelting (one third of the variant), kg.

For comparison, similar prototype melts were carried out (option 6, which was different from option 5, in that the re-recovery of the shpak (to eliminate the effect of baking coke), as in options 1–4 of the proposed technology, was carried out only on ferrosilicon without coke. used roller cone bits for smelting and ferrosilicon before restoration of the shpak (for the third smelting option) was 760 kg and 650 kg, respectively.

The results of the third (characterizing options) heats options 2-6 are also presented in table 1 and 2.

A comparison of the melts carried out in 6 variants showed that at practically similar magnitudes of the extraction of tungsten into metal, the exception is melting of variant 6, in which, due to the rapid destruction of the spackle foam, when using only ferrosilicon without coking to refine the sludge and significant melt cooling, the slag was removed only up to the maximum permissible content, even with a long duration of the pre-dosing period, the productivity of the processed WOj concentrates into smelting according to the offer This method is 18.7-23% higher than the prototype of roiaBKiax. The duration of the heats of the proposed technology due to an increase in the rate and degree of refining of ferro-tungsten from impurities and intensification of the slag re-recovery process, despite the increased loading of concentrate and additional charge materials, by 10 55 min (2-11%) shorter.

The degree of refining ferrofolf frame in swimming trunks on the proposed technical

sixteen

The manganese statistics, despite the increase in its content in the processed concentrate, is higher, and in the smelting options 1 and 2 even a higher grade metal was obtained - FV70B (up to 0.5% Mp) than in the prototype smelting. The degree of refining from carbon and especially from sulfur is much better than in the bottoms

The prototype, characteristic in this respect, is the melting of option 4, in which an ICC concentrate with a sulfur content of 1.8% was processed. which is almost twice as high as

sulfur in conditioned concentrates. Melting using the proposed technology allows to process wolframite concentrates with a total manganese content of 2–7% relative higher than the maximum permissible value in ferro-tungsten smelting on wolframite using the prototype method. This allows you to set the smelting (concentrates with virtually any content (usually up to 22% MlO) of manganese during the melt preparation) and expands the possibilities of using high manganese wolframite concentrates.

Retention allows the use of off-grade semi-finished products with an OJ content of 30% or more to be highly efficient in smelting ferro-tungsten. This greatly expands em

raw material base and allows you to reduce the loss of tungsten from ores with a thin germination of particles of wolframite and quartzite, eliminating for them the operation of enrichment to conditioned materials

Research Institute of Wolframite in concentrates. Saving from the introduction of the proposed technology is achieved due to an increase in the output of the melting unit for the produced ferrite.

rovolfram, and when used for smelting ferrovolfram, high manganese tungsten intermediates with a tungsten content of 3045% - and by reducing the cost of ferro tungsten.

biS

g ...

"CPU

AND

P And

ABOUT

Kl

§S§

&

-g

I | b 11§ | × a .e 8 i to a

I; Ihhti

I S - t to S P fif

 e -

d 3 9

m

I s

11g &

g, S 8 I g I

llliilis &

II1 i fe

about (n iB M M in

i | ggs§gi "

Yahv8o.v Rpp

I

g g "

I 1st

3 Th S 9 A

one

and

lilila

"

I

about

m eG

s

about

 and

at

2 .l

- iw o

G o “h

 and g. ,,

S s

 r in

ini

m g- rt o o

3225

H, (H M (3 O O O

U1L

Ltd

1L MF M

8§ § O “

S s s 2

G4 (H G4 (H

g

g

s

3

W o sh

Th r t r

YU

"

ABOUT

o

8 g S

MF N N

s

w

s

(M

g

- 14 n

To “o)

liMI-fe |

IfieM

3 § I g s a

BUT

§

yii

"G 8

1 $ «W for I

Vhki am "and

ilifslssli

hlih

R

. I о t;

k A t;

h

"C3i

3 "

A i a

-four . "EU L 3 about I I nxiooha and"

th "in || 8,828

L smgg & iss

J

fi as u Ф м

Ssg

tc.

g "

A me

rggfr

Th

rggg

i. li

8 J "I i o A" o

S 2 S I g

boo

g3S

stig

bt

h

5 in

4 A

BUT

S9

| i

: Sll

about "} II

"52

W o r. in s

5: 5 3

 g 9 s

oh oh oh oh

; ) 0 5 S 8

3 5 I

oh oh oh oh

1 t in g.

about

rO 3 O “L g o

 .M "h M MN

d. 5 I

mm - f I

1L w "about Q9

2 2 2 2 S

1L “W,

And S I and

l

isl

I I

S

(L m | L irt.

"H r 4 ii

fo. l lll

eight

m

. “G4 P -“ P

Claims (2)

1. METHOD OF MELTING ferrotungsten wolframite concentrates predominantly in a rotating electric arc furnace batch process comprising refining ferro tungsten by successive fusion waste melt and warm batch filling and penetration sshihtovannogo wolframite concentrate ratio MhO / WO ₃ 40.2 simultaneous additive coke fines, scooping ferro-tungsten with simultaneous batch filling of the bound tungsten concentrate with the same ratio MnO / WOj and coke, adding slag by introducing ferrosilicon over the entire surface of the melt, holding the melt and releasing bead, characterized in that, in order to increase the speed and degree of refining of ferro-tungsten from impurities, to intensify the process of re-reducing slag while increasing the total concentration of manganese in the processed concentrates and increasing furnace productivity , after scooping out ferro-tungsten before re-restoration of the spar, melt preparation is carried out by periodic batch loading on the surface of the melt and penetration of a mixture of high manganese tungsten concentrate with a MnO / WOj ratio in it> 0.2 with silica and iron oxides with a ratio of 1: (0.8-1.5 in the mixture of tungsten, silica and iron oxides ) :( 0.3-0.5), and the amount of high-manganese tungsten / concentrate is 5-20% by weight of the concentrate set for melting in its remaining periods, with constant uniform loading over the entire surface of the melt during its preparation of the coke mixture and ferrosilicon at a ratio of 1: (1.75-3) and quantities e coke 25-45% of the specified in the remaining periods of the heat. 2. The method according to π.I, characterized by the fact that, in order to expand the raw material base and reduce losses of tungsten, as a high manganese tungsten concentrate with a ratio of Mg) O ^ MO in it _? > 0.2, they use intermediates for the enrichment of high-manganese tungsten ores with a content of (No. 0 _? 30-45%, Si 0 ₂ 36-45% and set them for melting during preparation of the melt mixed with iron oxides with a total ratio in the mixture of trio ·· tungsten, silica and iron oxides, providing a given ratio of 1: (0.8-1.5) :( 0.3-0.5).