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Cyanide-free environment-friendly gold leaching agent

A gold leaching agent and environmental protection technology, applied in the field of hydrometallurgy, can solve the problems of large consumption of chemicals, difficult production, high production cost, etc., and achieve the effect of fast gold leaching speed, high leaching rate and fast leaching speed

Inactive Publication Date: 2021-10-08
柯柏友
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have the advantages of non-toxic or less toxic than cyanide, fast leaching speed and strong adaptability to impurities, but these methods also have certain limitations to varying degrees, such as large consumption of chemicals and difficulty in production. However, the disadvantages of high production cost and so on need to be further improved, especially to strengthen industrial experiment research, so it has not been able to actually replace the cyanidation method in gold industrial production and can be widely applied.

Method used

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  • Cyanide-free environment-friendly gold leaching agent
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The mineral property of a certain gold mine is gold oxide ore, valuable metal composition: Au3.5g / t, Ag105g / t; setting leaching conditions: chlorobromoisocyanuric acid is 0.1% (W / W), NaCI is 10% (W / W), pH value 5, solid-liquid ratio S: L is 1: 5; Grinding to -200 mesh accounts for 90%, according to setting, add sodium chloride in the pulp, make the concentration of sodium chloride at 10%, adjust The solid-liquid ratio is 1:5, add sulfuric acid to adjust the pH value to about 5, add chlorobromoisocyanuric acid powder at a concentration of 0.1%, stir and leaching for 6 hours, after the leaching is completed, use a filter press to separate the solid from the liquid, and the gold and silver in the leachate are absorbed by the gold-absorbing resin Recovery, tailings inspection, leaching rate of Au93.8%, Ag82.3%.

Embodiment 2

[0014] The mineral properties of a gold mine are low-grade oxidized gold ores, and the valuable metal composition: Au0.91g / t; the set leaching conditions: 0.1% (W / W) of chlorobromoisocyanuric acid, 5% (W / W) of NaCI ), pH value 6, solid-liquid ratio 1:5; ore grinding to -200 mesh accounts for 85%, and sodium chloride is added to the pulp according to the setting, so that the concentration of sodium chloride is 5%, and the solid-liquid ratio is adjusted to 1:5 , add sulfuric acid to adjust the pH value to about 6, add chlorobromoisocyanuric acid powder at a concentration of 0.1%, stir and leach for 4 hours, after the leaching is completed, use a filter press to separate the solid from the liquid, and the gold in the leaching solution is absorbed and recovered by gold-absorbing resin, tailings inspection, leaching The ratio is Au75.7%.

Embodiment 4

[0016] Gold copper flotation concentrate oxidation roasting sand in a gold smelter, valuable metal components: Au53.7g / t, Ag95g / t, Cu9.6%; set leaching conditions: 0.5% chlorobromoisocyanuric acid (W / W), NaCI is 10% (W / W), PH value is 4, solid-liquid ratio S:L is 1:6; the vertical mill regrinds to -300 mesh, accounting for 90%, and puts it in the pulp according to the setting Add sodium chloride to make the concentration of sodium chloride at 10%, adjust the solid-liquid ratio to 1:6, add sulfuric acid to adjust the pH value to about 3, add chlorobromoisocyanuric acid powder at a concentration of 0.5%, stir and leaching for 6 hours, and use a press to finish the leaching. After the solid-liquid separation by the filter, the gold and silver in the leaching solution are adsorbed with gold-absorbing resin, and the copper is replaced with reduced iron powder. The leaching rate of the tailings inspection is: Au93.3%, Ag91.5%, Cu93.2%.

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Abstract

The invention relates to a cyanide-free environment-friendly gold leaching agent which is an organic chlorine-bromine compound. The cyanide-free environment-friendly gold leaching agent has the chemical name of chlorobromoisocyanuric acid and the molecular formula of C3HO3N3ClBr, is white to reddish powder, is easily soluble in water, has stable chemical properties, is an efficient and broad-spectrum bactericide, and is widely applied to external disinfection of swimming pools, fishponds and livestock houses and sterilization and algae removal disinfection of industrial circulating water. The chlorobromoisocyanuric acid is dissolved in an aqueous solution to release Cl and Br to form hypochlorous acid (HCIO) and hypobromous acid (HBrO) molecules. Hypochlorous acid and hypobromous acid are strong oxidants and have a good gold leaching effect. Chlorine salt is added into a leaching solution to form chlorine-gold complex ions with the leached gold ions, so that the use amount of the chlorobromoisocyanuric acid is reduced. Production practices prove that the chlorobromoisocyanuric acid has the characteristics of high gold dissolving speed, high leaching rate, environmental friendliness, safety and high efficiency.

Description

technical field [0001] The invention relates to the field of hydrometallurgy, in particular to a non-cyanide environment-friendly gold leaching agent. Background technique [0002] The cyanidation gold leaching method has been developed for more than 100 years and has been dominant in the gold industry for a long time. The process of extracting gold by cyanidation is simple, has good adaptability, low production cost and high recovery rate of gold, which are the main reasons why this method has been adopted by people for a long time. However, the gold leaching speed is slow, the cycle is long, and the leaching process is easily disturbed by harmful impurities; sodium cyanide is highly toxic, which seriously endangers the lives of humans and animals, pollutes the ecological environment, and costs a lot for mine environmental protection. Since the 1970s, there have been many domestic and foreign researches on non-cyanide gold extraction methods, and a variety of gold extracti...

Claims

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Application Information

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IPC IPC(8): C22B3/16C22B11/00
CPCC22B3/165C22B11/04Y02P10/20
Inventor 柯柏友
Owner 柯柏友
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