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A kind of extraction method of gold and silver in clay graphite crucible slag

A technology of graphite crucible and extraction method, which is applied in the field of silver extraction and gold in clay graphite crucible slag, which can solve technical difficulties, inability to effectively extract gold and silver from clay graphite crucible slag, zero recovery rate, etc., and achieve high The effect of recycling efficiency, sufficient source of raw materials, and low price

Active Publication Date: 2020-04-17
CHENZHOU CITY JINGUI SILVER IND CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are few studies on the extraction of metal gold and silver from clay graphite crucible slag, because clay graphite crucible slag contains clay components. If the gold and silver are extracted directly by nitric acid and aqua regia, or they are first calcined and then added Both nitric acid and aqua regia leaching cannot effectively extract gold and silver in clay graphite crucible slag, and the recovery rate is almost zero. Therefore, there is a certain technical difficulty in recovering gold and silver from clay graphite crucible slag in the prior art

Method used

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  • A kind of extraction method of gold and silver in clay graphite crucible slag

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Experimental program
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Effect test

Embodiment 1

[0044]1) Stir and react the clay graphite crucible slag powder with a particle size of 150 mesh and sulfuric acid / fluorosilicic acid mixture at 50°C for 12 hours. After the reaction is completed, the mixed solution is cooled to room temperature, washed with water until neutral, and filtered to obtain filter residue and filtrate ; wherein the concentration of sulfuric acid in the sulfuric acid / fluorosilicic acid mixed solution is 80g / L, and the concentration of fluorosilicic acid is 100g / L; the mass volume ratio of clay graphite crucible slag powder and sulfuric acid / fluorosilicic acid mixed solution is 1:3g / ml ;

[0045] 2) After the filter residue was dried at 105°C for 12 hours, it was calcined at 950°C for 3 hours, and the calcined filter residue was cooled and ground to obtain powdery enrichment residue;

[0046] 3) Put the enriched slag in a nitric acid solution with a concentration of 100g / L, stir at room temperature for leaching reaction for 5 hours, dilute the mixed so...

Embodiment 2

[0049] 1) Stir and react the clay graphite crucible slag powder with a particle size of 200 mesh and sulfuric acid / fluorosilicic acid mixture at 60°C for 8 hours. After the reaction is completed, the mixed solution is cooled to room temperature, washed with water until neutral, and filtered to obtain the filter residue and filtrate ; wherein the concentration of sulfuric acid in the sulfuric acid / fluorosilicic acid mixed solution is 100g / L, and the concentration of fluorosilicic acid is 220g / L; the mass volume ratio of clay graphite crucible slag powder and sulfuric acid / fluorosilicic acid mixed solution is 1:2g / ml ;

[0050] 2) After the filter residue was dried at 105°C for 12 hours, it was calcined at 900°C for 2 hours, and the calcined filter residue was cooled and ground to obtain powdery enrichment residue;

[0051] 3) Put the enriched slag in a nitric acid solution with a concentration of 63g / L, stir at room temperature for leaching reaction for 4 hours, dilute the mixe...

Embodiment 3

[0054] 1) Stir and react the clay graphite crucible slag powder with a particle size of 325 mesh and sulfuric acid / fluorosilicic acid mixture at 70°C for 6 hours. After the reaction is completed, the mixed solution is cooled to room temperature, washed with water until neutral, and filtered to obtain the filter residue and filtrate Wherein the concentration of sulfuric acid in the sulfuric acid / fluorosilicic acid mixed solution is 150g / L, and the concentration of fluorosilicic acid is 340g / L; the mass volume ratio of clay graphite crucible slag powder and sulfuric acid / fluorosilicic acid mixed solution is 1:1g / ml ;

[0055] 2) After the filter residue was dried at 105°C for 12 hours, it was calcined at 1000°C for 1.5 hours, and the calcined filter residue was cooled and ground to obtain powdery enrichment residue;

[0056] 3) Put the enriched slag in a nitric acid solution with a concentration of 130g / L, stir at room temperature for leaching reaction for 6 hours, dilute the mi...

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Abstract

The invention discloses an extraction method for gold and silver in clay-graphite crucible slag. The extraction method comprises the following steps: taking clay-graphite crucible slag powder and a sulfuric acid / silicofluoric acid mixed solution to react; cooling, washing with water and filtering to obtain filter residues and filtrate; after drying the filter residues, carrying out high-temperature calcination; then cooling and grinding to obtain enriched slag; putting the enriched slag into a nitric acid solution and reacting at room temperature; then diluting and filtering to obtain extracting residues I and an extracting solution I; reducing the extracting solution I to extract the silver; putting the extracting residues I into nitrohydrochloric acid; after reacting completely, dilutingand filtering to obtain extracting residues II and a extracting solution II; reducing the extracting solution II to extract the gold. According to the extraction method disclosed by the invention, before being calcined, the clay-graphite crucible slag firstly reacts with the sulfuric acid / silicofluoric acid mixed solution, so that a condition that the clay-graphite crucible slag forms a block ina calcination process can be avoided; the separation of the gold, the silver and other impurities is realized, and the extracting and recycling rate of the gold and the silver is improved.

Description

technical field [0001] The invention belongs to the technical field of nonferrous metal recovery, and in particular relates to a method for extracting gold and silver from clay graphite crucible slag. Background technique [0002] Since the clay graphite crucible is often used to cast the smelted metal during pyrometallurgy, a small amount of crude metal will penetrate into the crucible during pouring. The crucible is used many times, and a large amount of metal will be enriched on the inner wall of the crucible. Especially when smelting gold, the clay graphite crucible used is enriched with more gold and silver. Gold and silver are high-value precious metals with extremely high economic recovery value. [0003] Ye Zhiqing announced a method for extracting indium and germanium from pyrometallurgical crucible slag by using the full wet method (patent application number CN201010169155. Indium, then MnO 2 Using concentrated sulfuric acid as an oxidant to leach germanium can ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B11/00
CPCC22B1/02C22B7/007C22B11/044Y02P10/20
Inventor 田宁郴李环黄前军谢兆凤
Owner CHENZHOU CITY JINGUI SILVER IND CO LTD
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