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A method for recovering gold from gold smelting slag

A technology of smelting slag and recovering gold, which is applied in the field of gold recovery, can solve the problems of complex process and not gold recovery, and achieve the effect of simple process, promoting gold leaching and good stability

Active Publication Date: 2020-12-25
苏尼特金曦黄金矿业有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Firstly, the mercury smelting tailings are ground with a ball mill until the fineness of -74μm accounts for more than 90%, and then enter the leaching tank, add gold-dissolving agents A, B and C into the leaching tank, stir and leaching for 24 hours, and the tailings The exposed gold is leached out, and the gold in the pulp solution is recovered by using the carbon slurry method; the tailings slurry after gold leaching continues to enter the flotation system, and is activated by adding activator D first, and then adding flotation agents E and F to recover gold in the form of concentrate Gold wrapped by sulfide ore; this method has the advantages of high gold recovery rate and no environmental pollution, but because this technology is used to recover gold from gold-containing mercury tailings, it is not suitable for recovery from gold smelting slag gold; secondly, its process is relatively complicated and not an efficient method for recovering gold

Method used

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  • A method for recovering gold from gold smelting slag

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] In the present embodiment, according to parts by weight, the composition of the gold leaching agent is: 20 parts of carbonized sodium cyanurate, 20 parts of sodium oxide,

[0041] 40 parts of sodium thiosulfate, 0.5 part of polyferric sulfate, 1 part of ammonium chloride;

[0042] A method for recovering gold from gold smelting slag, comprising the following steps:

[0043] (1) Break 2 kg of gold smelting slag (gold grade 687.58 g / t) to below 2 mm;

[0044] (2) put it into a titanium reactor, and soak it in hydrochloric acid with a mass concentration of 31% for 48 hours;

[0045] (3) washing the leaching residue with water until the pH value of the filtrate is 7, filtering to obtain a filter cake;

[0046] (4) Add water to the filter cake, and add calcium oxide to adjust the pH value to 10.5, adjust the slurry, and obtain a slurry with a mass percentage of 40%;

[0047] (5) In terms of the mass of gold smelting slag, add the gold leaching agent of 2000g / t in the slur...

Embodiment 2

[0049] In this example, according to parts by weight, the gold leaching agent includes the following components: 40 parts of carbonized sodium cyanurate, 10 parts of sodium oxide,

[0050] 20 parts of sodium thiosulfate, 5 parts of polyferric sulfate, 15 parts of ammonium chloride;

[0051] A method for recovering gold from gold smelting slag, comprising the following steps:

[0052] (1) Break 2 kg of gold smelting slag (gold grade 687.58 g / t) to <2 mm;

[0053] (2) Put it into a titanium reactor and soak it in hydrochloric acid with a mass concentration of 33% for 72 hours;

[0054] (3) washing the leaching residue with water until the pH value of the filtrate is 7, filtering to obtain a filter cake;

[0055] (4) Add water in the filter cake, and add calcium oxide to adjust the pH value to 11, adjust the slurry, and obtain a slurry with a mass percentage of 45%;

[0056] (5) In terms of the mass of gold smelting slag, add the gold leaching agent of 3000g / t in the slurry, t...

Embodiment 3

[0058] In this example, according to parts by weight, the composition of the gold leaching agent is: 20 parts of carbonized sodium cyanurate, 20 parts of sodium oxide, 40 parts of sodium thiosulfate, 0.5 parts of polyferric sulfate, and 1 part of ammonium chloride;

[0059]A method for recovering gold from gold smelting slag, comprising the following steps:

[0060] (1) Break 2 kg of gold smelting slag (gold grade 687.58 g / t) to <2 mm;

[0061] (2) put it into a titanium reactor, and soak it in hydrochloric acid with a mass concentration of 31% for 48 hours;

[0062] (3) washing the leaching residue with water until the pH value of the filtrate is 7, filtering to obtain a filter cake;

[0063] (4) Add water to the filter cake, and add calcium oxide to adjust the pH value to 10.5, adjust the slurry, and obtain a slurry with a mass percentage of 40%;

[0064] (5) Divide calcium peroxide with a total amount of 250g / t (in terms of the mass of gold smelting slag) into 5 parts, ea...

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Abstract

The invention belongs to the technical field of metal recovery, and specifically relates to a method for recovering gold from gold smelting slag. The main steps of the method for recovering gold fromgold smelting slag comprise the following processes: breaking for the gold smelting slag, hydrochloric acid soaking, leaching residue filtering, size mixing, gold leaching agent treatment, activated carbon leaching adsorption, and the like. The method is pollution-free to environment, high in recovery rate, and simple in technical process, is a clean and efficient gold recovery method, and is appliable to industrial popularization and application.

Description

technical field [0001] The invention belongs to the technical field of metal recovery, in particular to a method for recovering gold from gold smelting slag. Background technique [0002] Gold smelting slag contains residual gold, silver, copper and other valuable metals, which has a high recovery value and is an important secondary resource. Therefore, it is of great significance to recover the valuable metals in gold smelting slag, realize the resource utilization of smelting slag, and improve the comprehensive utilization rate of minerals. [0003] At present, common gold recovery methods from gold smelting slag include roasting-cyanidation leaching, acid leaching-cyanide leaching, flotation, high-temperature chlorination volatilization, regrinding + cyanidation, regrinding + amalgamation, Re-smelting, re-grinding + re-election, etc.; among these methods, sodium cyanide and mercury are highly toxic substances, and there are safety and environmental risks. Among them, the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B11/00C22B7/00
CPCC22B7/006C22B7/007C22B11/044Y02P10/20
Inventor 乔永平张化武白云龙马岳飞马忠凯
Owner 苏尼特金曦黄金矿业有限责任公司