SU1595947A1 - Method of refining black copper and secondary salts of noble metals by eletrolysis - Google Patents

Abstract

This invention relates to non-ferrous metallurgy, in particular to the electrolytic refining of non-ferrous metals. The purpose of the invention is to increase the selective removal of impurities. The goal is achieved due to the fact that cleaning is carried out in three electrolytic stages, with the first stage being carried out until the solid ingot of blister copper or the secondary alloy of precious metals is completely melted in the anodic polarization mode to form a bipolar melt electrode, the second stage is in the cathodic polarization mode before the impurities are introduced into the gas phase, the chloride oxide compounds of metals from the group including manganese, titanium, silicon, aluminum are introduced into the electrolyte melt; the third stage is carried out in the anodic polarization mode before water in the electrolyte melt is an excess of metal compounds introduced in the second stage, after which the spent electrolyte is used in the second purification stage. 2 tab.

Description

The invention relates to non-ferrous metallurgy, in particular to the electrochemical refining of non-ferrous metals.

The purpose of the invention is to increase the selective removal of impurities.

PRI me R. Ingot-electrodes are cast from blister copper or waste of copper-based precious metals; the cleaning process is carried out in a three-section electrolyzer. In the first section in the melt of chloride barium, borax, or their mixture in the ratio of 1: 1, the ingot-electrode is melted at

anodic polarization in the mode of a semi-immersed electrode. In this case, a 111; an ice melt of copper or an alloy of precious metals flows down onto the bottom of the electrolyzer and undergoes cathodic polarization. A copper melt along the bottom of the electrolyzer flows into the next sections of the electrolyzer, forming a flow-through bipolar electrode. In the second

The sections of the electrolyzer melt copper again subjected to cathode polarization in a chloride-oxide melt of compounds of alkaline earth metals, manganese, titanium, silicon, aluminum.

sl: oh her

four

table 2

Consumption of alloying metals in master alloys for the removal of precious metals, kg / t:

Mp

Ti

A1

Si

The content of alloying components in the electrolyte

MPO

Tio

Na2.SiFt

NaFAlF

Residual content of noble metals, g / t:

5.0 5.0 3.5 3.5

7.0 7.0 5.0 5.0

10.0 10.0 7.0 7.0

12.0 12.0 10.0 10.0

Claims (1)

Claim The method of refining blister copper and secondary alloys of precious metals by electrolysis in a melt of barium chloride or a mixture of barium chloride and borax, characterized in that, in order to increase the selective removal of impurities, the purification is carried out in three electrolytic stages, the first stage being carried out until the solid bullion ingot is completely melted or a secondary alloy of precious metals in the anodic polarization mode with the formation of a bipolar electrode from the melt, the second stage is carried out in the cathodic polarization mode, and chloride is introduced into the electrolyte idnye metal compounds from the group consisting of manganese, titanium, silicon and aluminum, and the third step are in a mode to anodic polarization in the output. excess electrolyte melt introduced. "at the second stage of metal compounds, after which the spent electrolyte is used in the second stage of purification" Face Options 1 Source material Prototype Proposed method Source material Prototype Proposed method Process parameters The contents of the main components and Tempera- tour *FROM Density current on stage Copper Extraction, X ve), X I II III 1st 5b 2nd 1 A / cm ’’ A / cm ² A / cm ² b. ι A / cm ² ——— 0.31 0.013 0.058 0,055 1250 - - 1,5 0.5 99.83 10 · ⁴ 10 ' ⁴ • “o- ⁴ 10 ' ⁴ 1250 fifty 1,5 0.5 ' 99.86 u ~ ^a 10'* 1 <r * 10- + 3.67 3.81 2.6 0.001 1250 - 1,5 0.5 ' 99.1 ίο * ⁵ 10·* 10 ³ 1250 fifty 1,5 1,5 0.5 98.3 Yu ^'th ' 10'* w ¹ 10'* Continuation of the table, 1 Options The content of the main components and impurities in the expected metal (alloy), X 5 5p Ζη Av Βί Those Pb g / t Aw. ' ^{g / t} ! RS, g / t Source material Prototype 0,03 10* 0.05 7 "10- * 0.003 7-10 ^ 0.026 2.10 ^st 0.06 10 4 0.002 2 "Yu ^and 0,07 10 ^ 807 9.1O ^'E 24 2 4 "10-> 73.24 10 The proposed method 10'* 2.KG ¹ 10 ^ 10 10** 10 ~ * ' Yu 2 IS- ⁵ 10'* 10 ' ⁵ Source material Prototype 0.26 10-> 5.63 10 “Ϊ 31.24 0.26 0.08 10 ~ ⁵ 1.18 1C ' ^g 0.002 Yu ' ^e 6.81 0.18 6,461 10 '' 0.38% s - ^g 0.187. 10'' The proposed method 10 ^m 10* w ^'e 10'* 10 10 ~ * 10 10 ' ⁵ 1 about; ⁵ 10'·* table 2 Indicator Way- prototype The proposed method ³ I > 1 5 Alloy consumption metals to ligate max for removal of precious metals, kg / t: Mp 2,164 Τΐ 3.28 - - - - - A1 3.56 - - - - - 8ί 1.42 - - - - - The content of alloying components in the electrolyte MnO .3.0 5,0 7.0 10.0 12.0 ΤΐΟι - 3.0 5,0 7.0 10.0 12.0 Pa _g 51P ^ Ν3ΡΑ1Ρ ₃ - 2,5 3,5 5,0 7.0 10.0 - 2,5 3,5 5,0 7.0 10.0 The residual content of noble metals, g / t: ser _o ebro 0.009 0.12 0.01 0.001 0.001 0.001 gold 0.004 0.01 0.008 0.001 0.001 0.001 platinum 0.001 0.015 0.006 0.001 0.001 0.001 Compiled by V. Kagermanyan