A method for extracting gold by microwave roasting of gold-containing sulfur-arsenic concentrate

A technology of microwave roasting and sulfur arsenic concentrate, applied in the field of gold recovery, can solve the problems of insignificant increase in leaching rate, easy sintering, high energy consumption, etc., and achieve the effects of saving pretreatment time, preventing sintering, and improving leaching rate

Active Publication Date: 2016-06-15
NANHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using conventional microwave roasting technology to pretreat gold-containing sulfur-arsenic concentrate, there are disadvantages such as easy sintering, high energy consumption, and insignificant increase in leaching rate in the later stage.

Method used

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  • A method for extracting gold by microwave roasting of gold-containing sulfur-arsenic concentrate
  • A method for extracting gold by microwave roasting of gold-containing sulfur-arsenic concentrate
  • A method for extracting gold by microwave roasting of gold-containing sulfur-arsenic concentrate

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Experimental program
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Effect test

specific Embodiment approach

[0039] A new gold-containing sulfur arsenic concentrate microwave roasting gold extraction method, the specific steps are:

[0040] (1) Add a certain proportion of H to the gold-bearing sulfur-arsenic concentrate 2 O, its best mass ratio is: 10:1. gold-bearing sulfur arsenic concentrate and H 2O mix evenly until it becomes a moist block, spread it on the bottom of the crucible, the laying thickness is 1cm-3cm, the best laying thickness is 2cm. The crucible is made of a material that does not absorb microwaves, the best material being quartz.

[0041] (2) Put the crucible in an industrial microwave oven with a certain power and bake until there is no smoke. Stop microwave heating.

[0042] (3) After microwave roasting, the gold-sulfur-arsenic concentrate is ground to -200 mesh, and then leached by iodination method, and the leaching rate of the slag is calculated.

[0043] V embodiment

Embodiment 1

[0044] Example 1, spread 50g of gold-containing sulfur-arsenic concentrate on the bottom of the crucible, the paving thickness is 2cm, put it in an industrial microwave oven, adjust the microwave power to 800W, and there is no obvious reaction after microwave heating for 30min, stop the microwave, take out the crucible, Weigh after cooling, the weight has no obvious change compared with before microwave roasting, see the attached figure 1 . Then grind the gold-containing sulfur-arsenic concentrate after microwave roasting to -200 mesh, and then use the iodide method for leaching, and the gold leaching rate is 8.25%. figure 2 .

[0045] After adding 5g of water to 50g of gold-containing sulfur-arsenic concentrate, spread it on the bottom of the crucible with a thickness of 2cm, place it in an industrial microwave oven, and adjust the microwave power to 800W. After 30 minutes of microwave heating, no smoke comes out, stop the microwave , took out the crucible, weighed after c...

Embodiment 2

[0046] Example 2, spread 100g of gold-containing sulfur-arsenic concentrate on the bottom of the crucible with a laying thickness of 2cm, place it in an industrial microwave oven, adjust the microwave power to 2kW, and after microwave heating for 60min, no smoke comes out, stop the microwave, Take out the crucible, weigh after cooling, the weight loss rate is 24.80%, see the attached figure 1 . Then grind the gold-containing sulfur and arsenic concentrate after microwave roasting to -200 mesh, and then use the iodide method for leaching, and the gold leaching rate is 39.51%. figure 2 .

[0047] After adding 10g of water to 100g of gold-containing sulfur and arsenic concentrate, spread it on the bottom of the crucible with a thickness of 2cm, place it in an industrial microwave oven, adjust the microwave power to 2kW, and after microwave heating for 60min, no smoke comes out, stop the microwave , took out the crucible, weighed after cooling, the weight loss rate was 26.57%, ...

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Abstract

The invention relates to a novel microwave roasting and gold-extracting method for gold-bearing concentrated dimorphite. The method comprises the specific steps: (1) adding H2O in a certain proportion into gold-bearing concentrated dimorphite, uniformly mixing to obtain moist bulks, and paving on the bottom of a crucible, wherein the thickness is 1-3cm; (2) placing the crucible in an industrial microwave furnace to roast till no smoke emits and stopping microwave heating; and (3) crushing sulfur concentrate roasted by microwaves to -200 meshes, leaching the gold-bearing concentrated dimorphite roasted by microwaves by adopting an iodide process, and calculating the slag leaching rate. Compared with conventional treatment methods, the method provided by the invention has the advantages that sintering is avoided, pre-treatment time and energy consumption are saved, microwave power reduced, required equipment are simple, and convenience in operation, easiness in implementation and high extraction rate are achieved, and is further suitable for treating other gold ores with high contents of sulfur and arsenic.

Description

technical field [0001] The invention relates to the technical field of recovering gold from gold-containing sulfur-arsenic concentrate, in particular to a method for extracting gold from gold-containing sulfur-arsenic concentrate by using microwave irradiation technology. Background technique [0002] Gold is one of the rarest and most precious metals and has been a major currency in circulation for a long time in history. Although the monetary function of gold has been weakened, gold reserves are still one of the symbols of a country's national strength. The distribution of gold on the earth is very uneven. More than 80 countries in the world are developing gold mines, and the output varies greatly. my country is relatively rich in gold mine resources, and its output has always been ranked fourth in the world. [0003] 60% of the world's gold reserves belong to refractory metallurgical ores. Most of the gold is produced from hydrothermal deposits with complex components an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B11/00
Inventor 丁德馨胡南陈伟李广悦陈文光戴四元李峰彭志成王永东
Owner NANHUA UNIV
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