SU1419805A1 - Method of reprocessing nonmagnetic cathode sediments - Google Patents

Abstract

The invention relates to powder metallurgy. The purpose of the invention is to reduce electrolyte losses and simplify the process. The invention is carried out as follows. The cathode sediment is crushed dry to a particle size of 0.4–0 mm, and then enriched in an organic liquid, allowing it to eliminate the dissolution of the electrolyte salts, suppress their hydrolysis and powder oxidation. In a non-aqueous medium, the electrolyte is ground to a particle size of iO, 063 mm, with the metal particles playing the role of abrasive and grinding media. The finished product is separated by distillation and returned to electrolysis. 2 tab.

Description

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about ate

1 - 141

The invention relates to powder metallurgy and can be used in the processing of non-magnetic cathodic precipitation.

The aim of the invention is to reduce electrolyte losses and simplify the process.

The method is carried out as follows.

The cathode sediment is crushed dry to 0, A-0 mm (the requirement for coarseness) and then enriched in an organic liquid of a non-aqueous medium, which eliminates the solubility of salts, suppresses their hydrolysis and oxidation of the metal powder. The enrichment process in a non-aqueous medium consists of a stage of selective electrolyte comminution to a particle size of 0, 063–0 mm, the output of the finished product by classifying iOj063 mm by grain, separating the liquid phase from the enrichment products by, distillation and returning it to the process,

The selective grinding of electrolyte is based on a significant difference in the physicomechanical properties of the metal and the non-metallic component of the cathode deposit. When mixed in a dense non-aqueous pulp (T: L {1: 1-1: 2), stronger and larger metal particles act as grinding and abrasive bodies (with respect to the electrolyte). When conditioned in a dense pulp with a stirrer speed of 1500 rpm and a stirring time of 30 minutes, the bulk of the electrolyte is ground to 0.063-0 mm,

In the thus prepared pulp there is a difference in the size of the electrolyte and the chrome powder. The difference in the density of chromium (7.19 g / CCO and electrolyte (2.4 t / nm) makes it possible, when grading +0.063 mm, to carry out gravitational enrichment due to the unequal speed of the particles.

Aromatic hydrocarbons (for example benzene), low molecular weight alcohols, hydrocarbons, etc. can be used as a liquid nonaqueous medium.

The results of enrichment, including selective electrolyte grinding and cathode sediment classification in

52

OjA -O mm grain size ± 0.063 mm are given in Table.

From Table 1 it follows that when grinding a material with a particle size of 1-0 mm to 0} 4-0 mm, the yield of class -O „05 mm increases from HjO to 22.9-2456% while reducing the metal in the electrolyte to 4.8 3.7% (due to dilution of this class with electrolyte).

In the course of research, the following methods were tested as dry separation of electrolyte from a metal: magnetic separation in a strong field, electrical separation, gas classification, and besitov electrovib.classification,

The results of the experiments are given in table 2,

As follows from the presented dan-sbiXj, none of the tested methods does not compete with 1x results with separation in a non-trace medium.

Essentially, the technology of cathode deposit of cores on a jaw crusher to a particle size of 10–0 mm. hammer to mm and then goes to the washing, which includes one stage of chromium powder washing with acidified (0.3% HC1) water and four stages.

acidification (prototype), while

return electrolyte is lost with drains

Using the proposed method of processing chromic cathode

the sediment allows to improve the technical and economic indicators of the process (to return to the process 78.3% of the electrolyte of the original quality., to reduce the loss of metha- nalic chromium

with electrolyte, reduce threshing; require cleaning of chromium salts, and simplify the process).

Form m l l a

about b e-g n i

The method of processing non-magnetic cathode deposits, mainly chrome-type Ecucion; grinding, hydro-metallurgical treatment of the precipitate and drying of the powder, about tons of l and h. In order to reduce electrolyte losses and simplify the process, the hydrometallurgical treatment is carried out on a liquid non-conventional medium by selectively grinding the electrolyte and classifying it by a grain of ± 0.063 mm.

Gravimetric composition of the initial n ground cathode sediment

T and S l and 1

8, 0 5.3 20.2

50, 8 .18,5 22,0

8, 8 8.0 2J, 5

12.9 18.0 20.0

29, 8 5.6 78.3

Table 2

Claims (1)

Claim A method of processing non-magnetic cathodic deposits, mainly chromic, including grinding, hydrometallurgical treatment of the precipitate and drying of the powder, which is carried out in order to reduce electrolyte losses and simplify the process, the hydrometallurgical treatment is carried out in liquid medium by selective grinding of the electrolyte and its classification by grain +0.063 mm Granulometric composition of the initial and ground cathode deposits with the distribution of metal and electrolyte in classes Table 1 Grades, mm Original sample Dry shredding Grinding in benzene Exit, Mass fraction, Extraction, Exit, Mass fraction! Exit, Mass fraction. Extraction X ί. . X Ζ 1 x Σ X X Metal Electro-Metal Electric Metal Electro Metal j Electro Metal Electronic Metal Electronic; 'rolls rolls rolls j ’ROLNT rolls rolls ♦ 1.0 1.057.4 + 1.0 + 0.4 .. 14.9 ^S 72.2, 4 + 0.2 36.0 a.s., 2 +, 063 32.667.9, 063 + ♦ 0, 05 1,531,1 -0.05 14.07.7 Total, ί0064.1 42.6 0.9 1,2 27.8 16.8 11.5 19.2 45.4 19.3 32.1 34.5 29, Ϊ 68.9 0.7 2.9 92.3 1.7 36.0 35.9 100 Ϊ 00 0.3 100 - 5,4 91.2 8.8 2 °, 1 91.0 9.0 40,4 75.8 24.2 1.9 34.2 65.8 22.9 4.8 95.2 100 64.1 35.8 0.5 - 0.2 7.7 1.3 5.3 41, 3 7.3 26.9 47.3 27,2 41.3 10 3.5 1.7 ', 7 60.7 24.6 100 100 100 84, 1 15.9 0.3 0.1 91.5 8.5 7.6 1,2 92.5 7.5 38.8 5." 79.6 20,4 51.5 23.5 23,4 76.6 0.6 3.6 3,7 98.3 . 4.* 66.0 64.1 35.9 100 100 Table 2 Way back Exit Bulk Extraction boots electric share of electro- tro- talla in ta 7 ° litas electro % cast D Gas class codification 8.0 5.3 Electrosepa- walkie talkie 50.8 18.5 Electrovibroclassification 8.8 8.0 Strong magnetic field dry separation 12.9 18.0 Non-aqueous separation 29.8 5,6 20,2 22.0 21.5 20,0 78.3