SU1007728A1 - Method of processing silicomanganese slags - Google Patents

Abstract

A METHOD FOR PROCESSING SILICOMANGANIER PLAINS containing non-magnetic metal beads, including crushing of raw slag, pneumatic enrichment with separation of metal concentrate, intermediate product and clean scrap and returning intermediate product to repeated pneumatic enrichment of the slag and reduction of the degree of crushing of the slag of the Li. and metal metal phases, the initial slag is crushed to a slope 1.5–2 times the maximum. the maximum size of the metal bead, and the intermediate product before returning; it is further crushed to size, 2-4 times less than the maximum size of the metal in the original slag and subjected to dust removal.

Description

ISD

00 The invention relates to ferrous metallurgy, in particular to the processing of solid metallurgical slag and can be used to extract a non-magnetic metal from slag. There is a method of processing solid materials, including crushing, g1H). Thread and separation 13. However, this method is not suitable for processing slags containing non-magnetic metal. The closest technical solution to the proposed one is a method of processing silicomanganese slags containing nonmagnetic metal crowns, including crushing of the original slag, pneumatic enrichment with release of metal concentrate, intermediate product and pure slag and return of the intermediate product to repeated pneumatic enrichment. In this method, the slag is subjected to crushing of 13 mm, sieving and pneumatic enrichment. As a result of the air enrichment, metal and slag concentrates and an intermediate product containing metal beads embedded in the slag are obtained. The intermediate product is returned to the re-pneumatic enrichment 02. The disadvantage of this method is the re-grinding of the slag and metal phases, as well as the formation of a large number of small slag fractions (less than 1 mm), which significantly reduces the efficiency of metal extraction from the slag. The purpose of the invention is to increase the efficiency of the release of a non-magnetic metal from slag and reduce the degree of overgrinding of the slag and metal phases. The goal is achieved by the fact that in the method of processing slags of silicon-manganese containing non-magnetic metal cores, including crushing of raw slag, pneumatic enrichment with separation of metal-containing waste, intermediate product and pure slag and return of intermediate product to repeat, pneumatic enrichment, initial the slag was crushed to a particle size 1.5–2 times the maximum size of the metal beads, and the intermediate product before returning it to the repeated pneumatic enrichment rho

fractions, mm +70 4O-70 13-40 10-135-10

Content,% 7.5 38.0

36.4

1-5

-one

10, O

4.8

5.8

3.5 bt to a particle size of 2–4 times less than the maximum size of metal crowns in the original slag and dedusted. It has been established by research that, in the tongues and acid shpak from the production of silico-manganese, the maximum size of metal beads is 15-2 O mm, and their bulk is in a fraction of 5-1 O mm. Therefore, crushing the original slag to a grain size of 30-mm (against 13 mm in the prototype) allows reducing the content of dust-like (less than 1 mm) particles in it, which significantly increases the efficiency of non-magnetic metal release from the slag. So, if the efficiency of metal release from slags for classes 1-13 mm is 88-91%, then for classes. (O-1 mm) does not exceed 56-64%. A larger upper crushing limit than in the prototype also makes it possible to reduce the degree of over-shredding of the slag phase, which increases its value. When crushing the original slag to a particle size of more than 4 mm, the conditions for separating metal particles from slag significantly deteriorate, which increases the proportion of material with intermediate density and leads to a decrease in the efficiency of the release of non-magnetic metal from slag. When crushing the original slag to a particle size of less than 30 mm, the yield of small classes increases, which reduces the efficiency of separation of metal and slag, as well as the value of the resulting slag products. In the proposed method, the middling Fraction t to a particle size of 5-10 mm, which contributes to the fullest disclosure of metal beads and, accordingly, increases the efficiency of metal extraction from slag. When crushing an industrial product over l6 mm, the metal cores are incompletely opened, and when crushing less than 5 mm, slag and metal phases are overgrinding, which in both cases leads to a decrease in the separation efficiency of the nonmagitic metal and slag. Example. Recycled slag from the production of silico-manganese, containing, non-magnetic metal beads, barely having a particle size distribution.

 The maximum size of silico-manganese beads in the slag is 2 mm.

Conducted two series of experiments corresponding to the two methods of processing according to the known and proposed sprobob.

The known method. The initial slag is crushed to 13 mm and sent for pneumatic enrichment with separation of metal and slag concentrates and middling.

The industrial product is returned to the re-pneumatic okeydeidenke.

The proposed method. The original slag was crushed to a size of 4 mm and sent to pneumonic enrichment. The recovered middlings are crushed to 10 mm and directed to aerial classification. After that, the dust-free industrial products are returned to the repeated pneumatic enrichment.

In tab. 1 shows the results of pneumatic enrichment of crushed slag fractional composition.

Table 1

It is seen that the fragmentation of the original shlak to larger fractions led to a decrease in the yield of small fractions.

Intermediate product isolated during pneumatic enrichment, draw. b t to Yu mm. Held sieve sieving promprrdukta, crushed to different:

Broken Promprodukt directs particles of less than-1.0 mm particle size.

the classification carried out in the intermediate product is reduced by 92%. pneumoclassification countercurrent.

type The air velocity is 10 m / s. The sprayed middlings return

productivity is 0,5 t / h. As a result, pneumobacidi. The results of the experiment.

Those pneumlassification content of the slag are listed in Table. 3

fractions and the determined distribution of the metal in the form of pure beads and inclusions in the slag, depending on the degree of grinding of the middling.

In tab. 2 shows the material composition of the intermediate product,%.

table 2

51007728

Reuulgags of slag processing by production of silicomanganese Evaluation of the efficiency of the process of extracting a nonmagnetic metal from the slag is made according to the criteria, the main material composition of the products is enriched using the formula M E 100 I00-GG 100 Y, where E cd is the extraction of metal into metallic concentrate %; ESCD - extraction of slag to slag - concentrate,%} - yield of products,%; 1L.K. - metal concentrate; SL X - slag concentrate, the efficiency of the non-magnetic release of metal from the slag of the prototype

Table 3 l eg 87.5%, according to the proposed method 92.2%. On the basis of the conducted surveys, it was established that the processing of slags according to the prior. This method allows to increase the efficiency of non-compacting metal from slag by 4.7% compared with the prototype, as well as to reduce the degree of overgrinding of the slag and metal phases. The advantage of the proposed method is; which increases the efficiency of the process, reduces the degree of over-grinding of the slag and metal phases, and also improves the working conditions of the staff by reducing dust generation at the sites of overfilling.

Claims (1)

, METHOD FOR PROCESSING 'SILICOMARGANIAN SLAGS containing non-magnetic crusts of metal, including crushing of initial slag, pneumatic enrichment with the release of metal concentrate, intermediate product and pure slag and return of the intermediate product to re-pneumatic enrichment, characterized in that, in order to increase the efficiency of non-magnetic separation metal from slag and reduce the degree of overgrinding of slag and metal phases, the original slag is crushed to a particle size of 1.5-2 times greater than poppy. the maximum size of the metal kings, and the intermediate product is the return of pepper; it is re-crushed to re-Pneumatic enrichment to a coarse grain, 2-4 times smaller than the maximum size of the metal kings in the original slag, and subjected to dedusting ^; niyu. -