RU2490070C1 - Method of flotation of sulphide ores containing bearing metals - Google Patents

Abstract

FIELD: process engineering.

SUBSTANCE: invention relates to dressing of minerals, particularly, to flotation separation of noble metals and may be used for flotation dressing of gold-bearing sulphide ores and dressing products bearing noble metals. Proposed method comprises conditioning of crushed pulp in the presence of the main collector and complexing agent selective with respect to noble metals, introducing foaming agent and releasing noble metals into flotation product foam. Said complexing agent selective with respect to noble metals represents perhydro-1,3,5-dithiazanine-5-il-methane that can form sound bond with noble metals. Relationship between complexing agent selective with respect to noble metals and sulfhydric collector varies from 2:0.5 to 0.5:1.5.

EFFECT: higher yield of noble metals.

3 tbl, 7 ex

Description

The invention relates to the field of mineral processing, in particular to flotation separation of noble metals and sulfide minerals with associated noble metals from crushed raw materials, and can be used in flotation processing of gold-bearing sulfide ores and enrichment products containing precious metals.

Known methods of flotation using xanthogenates as a collector and combining xanthogenate with aeroflot [1] The disadvantage of this method is the low extraction of a valuable component in the concentrate, low selectivity index, high consumption of flotation reagents, high loss of metal with tailings.

Known methods for the extraction of precious metals (gold and palladium) from solutions by sorption using as a sorbent a heterocyclic compound of the dithiazinane series 1,2-bis (perhydro-1,3,5-dithiazin-5-yl) ethane. Using a sorbent can increase the degree of extraction of precious metals, reduce the specific consumption of the sorbent per unit of recoverable metal and the energy intensity of the process [2].

A known method for the extraction of precious metals from spent catalysts, including the dissolution of precious metals with an acid-oxidizing mixture, sorption of precious metals from a solution and their separation from the sorbent concentrate by ashing, characterized in that 1-hydroxy-2- (perhydro-1,3 -5-dithiazine) -5-yl-ethane [3].

In the above methods, precious metals in a state dissolved by an acid-oxidizing mixture are extracted with solid sorbents, substances belonging to the class of heterocyclic compounds of the dithiazinane series.

The closest in technical essence, in terms of characteristics and the achieved result is a method of flotation of gold sulfide ores by conditioning pulp with butyl xanthate, butyl aeroflot and blowing agent [4].

The disadvantage of this method is the low extraction of a valuable component in the concentrate, low selectivity index, high consumption of flotation reagents, high metal loss with tailings.

The technical problem solved by the developed technical solution is to develop an effective method for the separation of precious metals from ores and ore products, for example, gold and gold-containing sulfides in a flotation concentrate.

The technical result obtained by the implementation of the developed method consists in providing selective separation of valuable components into a concentrate while reducing irretrievable losses of valuable components with common tails in the presence of a sulfhydryl collector, a complexing reagent selective for precious metals and a blowing agent.

To achieve the technical result, it is proposed to use the developed method of flotation of gold-bearing ore, including conditioning pulverized pulp with a sulfhydryl collector, introducing a complexing reagent selective for precious metals and a blowing agent, and isolating valuable components in the foam flotation product, using the heterocyclic compound of the dithiazinane perhydride series as a complexing reagent -1,3,5-dithiazin-5-yl-methane (MTX).

In a preferred embodiment, a ratio of sulfhydryl collector, butyl xanthate and perhydro-1,3,5-dithiazin-5-yl-methane (MTX) ratio of 2: 0.5 to 0.5: 1.5 is used.

When implementing the method can be used:

- (sulfhydryl) collector, potassium xanthate (BKS), corresponding (GOST 7927-75) or other alkyl xanthates or dialkyldithiophosphates, etc.

- perhydro-1,3,5-dithiazin-5-yl-methane (MTX), obtained on the basis of hydrogen sulfide, by the reaction of multicomponent condensation with industrially available primary amines in the presence of formaldehyde according to a known method, for example, French Patent No. 1341792, cl. A01N, C07C, C07D, publ. 1963 - blowing agents: Methylisobutylcarbinol (MIBK) TU 6-02-891-78, Dimethylphthalate (D-3) GOST 8728-77 or Pine oil GOST6792-74.

The effectiveness of MTX is based on its ability to form a strong complex compound with Au on the surface of gold-bearing particles, ensuring the efficient separation of gold and gold-containing minerals.

To perform flotation separation of gold-bearing minerals in laboratory conditions, a laboratory mechanical flotation machine was used; in industrial conditions, any type of flotation machine can be used.

To confirm the effectiveness of the developed method, a comparison was made with the method selected as the closest analogue.

The experiments were performed on the above laboratory equipment, on the pyrite-containing tailings of the Gaisky concentrator, artificially enriched with gold-containing pyrite (V.A. Chanturiya, T.A. Ivanova, E.V. Koporulina). Methodology for assessing the effectiveness of the interaction of flotation reagents with gold-containing pyrite // Tsvetnye Metally No. 8, p.16-19.), And on the tailings of the gravity cycle of gold-containing ore of the Magistralnoye deposit (Krasnoyarsk Territory). The gold content in Guy’s tails is about 0.8 g / t of mineral. The gold content in the tails of gravity of the field is about 4-5 g / t, the iron content is 2.5-3.0%. The gangue is 30% represented by quartz and 52% by feldspars.

The fineness required for the experiments was obtained by abrasion of minerals in a porcelain mill and dispersion into classes on sieves. The positive effect of this reagent on the flotation process is shown in the following examples.

Example 1 according to the prototype method (experiment 1 in table 1)

A portion of pyrite weighing 1 gram with artificially applied gold, fineness

(-0.1 + 0.063 mm), were placed in a 20 ml flotation chamber, a BCS collector (100 g / t) was introduced and conditioned for 1 min, MIBK blowing agent was introduced, stirred for 1 min, then floated for 3 minutes.

Example 2 (experiment 2 in table 1)

A portion of pyrite weighing 1 gram with artificially applied gold, fineness

(-0.1 + 0.063 mm), was placed in a 20 ml flotation chamber, MTX reagent (100 g / t) was introduced and conditioned for 1 min, MIBK blowing agent was fed, stirred for 1 min, then floated for 3 minutes.

Example 3 according to the developed method (experiment 3, 4, 5 in table 1)

A weighed portion of pyrite with artificially applied gold, fineness (-0.1 + 0.063 mm), was placed in a 20 ml flotation chamber, a BCS collector was introduced, MTX reagent was introduced, MIBK blowing agent was introduced, mixed for 1 min with each reagent, then floated for 3 minutes.

Table 1 The results of flotation of pyrite artificially enriched with gold by the prototype method (experiment 1) and by the proposed method (experiments 2-5) Experience number Reagent combinations Reagent consumption g / t Pyrite recovery,% one BCS one hundred 75.0 2 MTX one hundred 50.3 3 BKS + MTX BKS 75 + MTX 25 84.6 four BKS + MTX BKS 65 + MTX 35 91.5 5 BKS + MTX BKS 50 + MTX 50 82.6

Analysis of the data in table 1 shows that the conditions of experiments 3 and 4 are the best. The combination of MTX reagent with xanthate (experiments 3 and 4) allows to increase the yield of gold-containing pyrite in the foam product of flotation by 10-15%. With the complete replacement of xanthate by MTX, the yield is lower than with xanthate by 15%.

Example 4 by the prototype method (experiment 1 in table 2)

Experience tailings artificially enriched with gold. Gold-containing pyrite with a fineness (-0.1 + 0.063 mm) at a ratio of 20: 1 was added to a sample of the tailings of the Gaisky concentrator with a fineness (80% of the class -0.071 mm). After thoroughly mixing and averaging (quartering) the sample, the gold content in the sample was 83 g / t. Samples weighing 20 grams were placed in a 100 ml photocamera at T: W 1: 4, pH = 5.5 was created using CaO, and a BCS collector was introduced (60 g / t) and conditioned for 7 min, MIBK blowing agent (150 g / t) was introduced, stirred for 1 min, then floated for 5 minutes.

Example 5 according to the developed method (experiments 2-4 in table 2)

Gold-containing pyrite with a fineness (-0.1 + 0.063 mm) at a ratio of 20: 1 was added to a sample of the tailings of the Gaisky concentrator with a fineness (80% of the class -0.071 mm). After thoroughly mixing and averaging the sample (quarting), the average gold content in the sample was 83 g / t. Samples weighing 20 grams were placed in a 100 ml flotation chamber at T: W 1: 4, pH = 5.5 was created using CaO, a BCS collector, MTX reagent (60 g / t) were introduced, conditioned for 7 min, MIBK blowing agent was introduced (150 g / t) was stirred for 1 min, then floated for 5 minutes.

table 2 The flotation results of dump pyrite-containing tailings artificially enriched with gold by the prototype method (experiment 1) and by the proposed method (experiments 2-4) Experience number Product Exit, % Au content, g \ t Au recovery,% Flotation conditions one Concentrate 31,4 170.74 61.84 BCS - 60 g / t Tails 68.6 48.22 38.16 2 Concentrate 22,99 181.45 53.79 BKS - 20 g / t, MTX - 40 g / t, Tails 77.01 46.52 46.21 3 Concentrate 29.63 195.86 63.27 BKS - 40 g / t, MTX-20 g / t Tails 70.37 47.64 36.73 four Concentrate 25.88 186.22 54.66 BKS - 30 g / t, MTX - 50 g / t Tails 74.12 53.93 45.34

Analysis of the data in the table shows that the best flotation conditions for the proposed method are the conditions of experiment 3. Using a combination of MTX reagent with xanthate (experiments 2, 3 and 4) can increase the gold content in the concentrate by 11-15% and increase the extraction of gold in the concentrate by 1.6% (experiment 3).

Example 6 - by the prototype method (experiment 1 in table 3)

A sample of gravity tails weighing 300 grams was ground in a ball mill to a particle size of 80% of the class -0.071 mm. The resulting pulp was transferred to a flotation chamber with a volume of 1 dm ³ , a collector - butyl xanthate 60 g / t was added. The pulp with the collector was conditioned for 2 minutes, a blowing agent - dimethyl phthalate (D-3) 75 g / t was fed and the main flotation operation was carried out for 6 minutes. After the main flotation, 25 g / t of butyl xanthate, 25 g / t of D-3 blowing agent were added to the chamber, stirred for 1 min, and then control flotation was carried out for 5 minutes.

Example 7 - according to the developed method (experiments 2-4 in table 3)

A sample of gravity tails weighing 300 grams was ground in a ball mill to a particle size of 80% of the class -0.071 mm. The resulting pulp was transferred to a flotation chamber with a volume of 1 dm ³ , a complexing reagent was added: in experiment 2, MTX reagent 15 g / t and butyl xanthate 45 g / t; in experiment 3 - MTX reagent 30 g / t and butyl xanthate 30 g / t; in experiment 4 - MTX reagent 60 g / t. Then, a foaming agent, D-3, 75 g / t was introduced and the main flotation operation was carried out for 6 minutes. After the main flotation, 25 g / t of butyl xanthate, 25 g / t of D-3 blowing agent were added to the chamber, stirred for 1 min, and control flotation was performed for 5 minutes.

Analysis of the data in table 3 shows that the conditions of experiments 2 and 3 are the best. The combination of MTX reagent with xanthate (experiments 2 and 3) allows to obtain high quality gold concentrate, increase gold recovery in the main flotation concentrate and significantly reduce gold losses with flotation tailings. With the complete replacement of xanthate by MTX in the main flotation operation (experiment 4), a concentrate was obtained with a gold content of 61.68 g / t, instead of 31.32 g / t in the experiment with xanthate (experiment 1). However, gold recovery with MTX reagent is 2% lower than with xanthate.

The results presented in the table indicate a high selectivity of the MTX reagent with respect to gold. The developed method allows for the selective selection of valuable components in the concentrate while reducing irrevocable losses of valuable components with tails relative to the prototype method.

Table 3 The results of the flotation of tailings of gravity of ore from the Magistralnoye deposit by the prototype method (experiment 1) and by the proposed method (experiments 2-4) one Exit, Au content, Au extraction, Collector Product % g / t % Xanthate 60 g / t Basic concentrate flotation 12.22 31.32 91.12 Xanthate 25 g / t Control concentrate flotation 3.87 2.28 2.10 Tails 83.91 0.34 6.78 Source food 100.00 4.20 100.00 2 MTX 15 g / t + Basic concentrate flotation 11.53 35.67 94.61 Xanthate 45 g / t Concentrate Xanthate control 25 g / t flotation 2.62 3.04 1.83 Tails 85.85 0.18 3,55 Source food 100.00 4.35 100.00 3 MTX 30 g / t + Concentrate DOS. flotation 11.42 34.70 94.48 Xanthate 30 g / t Xanthate Concentrate counter. 25 g / t flotation 3.40 2,55 2.07 Tails 85.18 0.17 3.45 Source food 100.00 4.19 100.00 four Concentrate MTX 60 g / t main flotation 6.49 61.68 89.28 Xanthate 25 g / t Control concentrate flotation 1.98 8.54 3.78 Tails 91.53 0.34 6.94 Source food 100.00 4.48 100.00

The developed method allows to provide higher technological parameters of flotation compared to the prototype

Information sources

1. Extraction of precious metals from the tailings of processing plants. Enbaev I.A. et al. Metallurg, technol. in the processing of ores and concentrates of non-ferrous metals. GOSNII Color Met, M., 1993. - P.104-105).

2. A method of extracting gold and palladium from solutions. Aleev R.S .; Dalnova Yu.S.; Aksenenko R.I .; Germasheva N.I .; Esipenko A.I .; A. Poloumov; Borisova V.V .; Nedorubko A.G. RU, patent 2102508 C1 (51) 6C22B 11/00, C22B 3/24, 1998.

3. The method of extracting precious metals from spent catalysts. Aleev R.S., Dzhemilev U.M., Dalnova Yu.S., Borisova V.V., Poloumov A.V., Esipenko A.I., Andrianov V.M. and Kalimullin A.A. RU, patent No. 21116362, C22B 3/24, 11/00, B01J 23/96, 1998.

4. L.Ya. Shubov, S.I. Ivankov, N.K. Shcheglova. Flotation reagents in the processes of mineral processing: Reference: In the book. / Ed. L.V. Kondratieva. M .: Nedra, 1990. - Book. 2. (Prototype).

Claims (1)

A method of flotation of sulfide ores containing noble metals, including conditioning pulverized pulp in the presence of a main collector and a complexing agent reagent selective for noble metals, introducing a blowing agent and releasing noble metals in a foam flotation product, characterized in that perhydro is used as a complexing agent reagent selective to noble metals -1,3,5-dithiazin-5-yl-methane, capable of forming a strong compound with noble metals, the ratio of UFH collector and complexing reagent selective for noble metals is from 2: 0.5 to 0.5: 1.5.