SU1458408A1 - Method of processing perroalloy slags - Google Patents

Abstract

The invention is suitable for ferrous metallurgy, and that is, for the processing of ferro-smelting aluminum, and can be used to extract non-magnetic alloys, such as silico-manganese, from slags. The aim of the invention is to increase the through extraction of the reduced lead from slag, to improve the ecology of the process. Before pneumatically enrichment from slag, it is proposed to eliminate the fraction minus 3-8 mm, and the enrichment of the plus product is carried out at a flow rate Q per 1 m of each section of the separator equal to (i, 8-). , -h-10 (m 3 / h) 5 where p-bulk is for the density of the plus product, t / m; h its thickness in this area of the separator deck, m. The method allows to increase the through extraction of manganese from slag by 6.8-12.2%, reducing the amount of dust emissions during the process. table ,,. 53

Description

The invention relates to black meraj. prm -: .. is intended for the processing of ferroalloy slags and can be used to extract non-magnetic alloys, for example, silicon manganese, from pshacks.

The purpose of the invention is to increase the through extraction of the restored host element from the throttle, to improve the ecology of the process.

The essence of the invention is as follows.

The predominant size of the rounded over the alloy beads in ferroalloy slags is within 0- (3-8) mm. When crushing the source material, they are opened freeing up with varying degrees of completeness from the rio silicate metal-slag interface. The operation of the pneumatic separator (decking mode; organizing the pseudo-layer of the material on the deck by air flow) cannot create the necessary conditions for the effective separation of the metal-slag mixture of the specified size - minus 3-8 mm. As a result, after the separation of the entire material, the alloy content in the slag fraction 0- (3-8) mm remains almost the same as in the original (before enrichment) slag. In addition, differences in the dynamic characteristics of the mixing of coarse and fine slag along the surface

The strips of the separator deck lead to uneven distribution of material in the working both in size and thickness of its layer, which makes it difficult to control the air flow to create the most favorable enrichment regimes.

As shown by the analysis of samples of material localized in the dust cleaning system, the processing by the method of pictorial separation of small classes of galaxies is accompanied by significant metal losses, which in the form of microcolleges with air flows created by an excellent ventilator.

Thus, the preliminary screening of slag of minus 3–8 mm with the subsequent use of it according to well-known methods and enrichment of the plus class allows to significantly improve the effect: the enrichment of slag enrichment with ferroalloy, thus increasing the loss of the leading element end-to-end extraction, and almost completely eliminate dust drops during separation.

 Free from small class slag, falling on the deck of cenapsiTOpa in the course of its operation, is distributed among workers; it has zones with a certain regularity depending on the enrichment mode S, which allows in each case (vice, the size of the original slag, the required separation parameters etc.) select the most efficient process conditions. At known frequencies of pulling up the air flow and the oscillations of the working surface of the separation, the decisive factor is Stanovit (- air consumption on a certain part of the deck per 1 m as a function of the total density of the slag of all1: g material ( p, t / m) and its inner layer (h, m). Such a relationship that determines the boundaries of the most efficient (from the point of view of extracting its element from ferroalloy slags) of the enrichment mode is described by an empirical formula:

Q (l, 8-2,4) p-h-10 (m / h)

At values of the coefficient of proportionality, lower: 158 ,, kinetic energy, the energy of the pulsating air is: (this flow is insufficient for creating the effect of slag boiling and gravitational separation of its KONmoHeHTOB

0 5 g

five

density, which reduces the quality of the metal concentrate and increases the loss of metal with a light product (depleted slag).

Exceeding the coefficient value of 2.4 results in the rapid movement of the entire slag along the inclined surface of the deck towards the bead of unloading the alloy-depleted material, which dramatically reduces the yield of the enriched product and, as in the first case, increases the irrecoverable loss of ferroalloy.

 An example. The slag, crushed to a particle size of 0–20 mm, from smelting of silicon manganese was subjected to sieving according to the class of 5 mm, and the plus fraction was enriched on a pneumatic separator (deck area 12 m) with an air pulsation frequency of 220 min and a sweep frequency of the separation working surface of 360 min. Four fields with an area of 3 m each, the separator deck was adjusted so that, depending on the average P -h, certain values of the coefficient of proportionality were recorded.

Result a pilot industrial is-. the method of processing is presented in the table,

Maximum total extraction. manganese in the metal concentrate and slag sand with a particle size of 0-5 mm is achieved in the range of the proportionality coefficient from 1.8 to 2.4. At values of the coefficient outside the specified interval, a sharp decrease in the extraction of manganese into the metal concentrate is observed with a comparable content of this element in it, thereby significantly increasing the total loss of manganese with a lean product.

The proposed method of processing makes it possible to increase the through extraction of manganese from slags by 6.8-12.2%, to reduce metal losses with drunk and pick-ups during the enrichment of slags.

f o

the invention

pm u l and

A method of processing ferroalloy slags, including crushing of the original slag, pneumatic enrichment to screening the small fraction of the slag, different from; that, in order to increase the through extraction of the restored lead element from slag, to improve the ecology of the process 5158 58886

ca, sifting out the fraction minus 3–8 mm equivalent to (I, 8–2, 4) p b. 0 m VH, where they exist before the pneumatic ob- f — the bulk density of the material, by enrichment, and the enrichment of the positive prot / m, and h — the thickness of the layer of material that the duct on the separator deck is carried out

at air flow Q per 1 m of deck,

m, on this section of the separator deck

equal to (I, 8-2, 4) p b. 0 m VH, where f is the bulk density of the material, t / m, and h is the thickness of the layer of material,

m, on this section of the separator deck,

Claims (1)

60 claims A method of processing ferroalloy slags, including crushing of the initial slag, pneumatic enrichment 55 and screening of a fine slag fraction, characterized in that, in order to increase the through extraction of the recovered lead elementary separation of its components from the slag, improve the ecology of the process 14548408 ⁶ ca, screening fraction minus 3 -8 mm is carried out before pneumatic enrichment, and the enrichment of the positive product on the separator deck is carried out at an air flow Q of 1 m ¹ deck equal to (i, 8-2,4) _р -h · 1 0 * m ³ / h, where p - bulk density l of material, t / m ^e , and h is the thickness of the material layer, m, in this section of the separator deck. Processing method. Proportionality coefficient Q. THOUSAND .Μ ^3/1 * · Μ ¹ Solojayany MP in metalheap, X Extract MP from the original, X The entrainment of metal with dust, X from the outcome of # ¹ I field _f h 0.60 II field r 0.59 III none 0.46 IV none f h 0.25 in metal  vlah Fractions 0-5 w total Offers 1,6 9.6 9,4 7. * 4.0. 62.8 . 17.6 28.6 46.2 0.08 gay 1.8 10, β 10.6 8.3 4,5 63.1 26.0 28,4 54,4 0.11 2.0 ) 2.0 11.8 ' 9.2 5,0 64 3 31, 9 27.9 59.8 0.12 2.2 13,2 13, about 10.1 5.5 64.0 28,4 29.3 57.7 0.14 2,4 14,4 14.2 11.0 6.0 64.0 27.6 28,2 55.8 0.17 2.6 15.6 15.3 12.0 6.5 64,2 16.1 28.3 44,4 0.19 Prototype Q _{oi- (} “94tys.mE / h and Deco” (12 m ⁵ ) 64.1 29.1 18.5 47.6 1,64