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Integral gold refining kiln oxidizing roasting process for refractory gold ore

A technology for refractory gold ore and oxidative roasting, applied in the field of precious metal processing, can solve the problems of long process flow, complicated operation and high equipment requirements, and achieve the effect of solving serious environmental pollution, easy control of conditions and large ore processing capacity

Inactive Publication Date: 2007-03-21
云南省地质科学研究所
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods still have some unsatisfactory parts so far, such as: (1) the main problems of the oxidation roasting method are: long process flow, large investment, high production cost, small amount of ore processing, and serious environmental pollution; (2) The main problems of the pressurized oxidation method are: complex process flow, high equipment requirements, large investment, complicated operation, high production cost, and small ore processing capacity; (3) The main problems of the microbial oxidation method are: long ore pretreatment time, adaptability Limited reactivity, low oxidation of sulfur and arsenic, often low gold leaching

Method used

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  • Integral gold refining kiln oxidizing roasting process for refractory gold ore
  • Integral gold refining kiln oxidizing roasting process for refractory gold ore
  • Integral gold refining kiln oxidizing roasting process for refractory gold ore

Examples

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Effect test

Embodiment 1

[0033] In a gold mine in Yunnan, more than 90% of the gold is wrapped in pyrite and arsenopyrite in fine granular form. The ore contains S13%, As0.12%, C3%, Sb1%, etc., which is an extremely difficult gold to handle. Mine, pass it through the following process steps;

[0034] A. Grind the above gold ore to 40 mesh;

[0035] B. Add 1% by mass of pulverized coal rib burner to the above-mentioned ground gold ore, so that the carbon content in the mixture is controlled at 4% by mass. After fully mixing, it is made into a block or honeycomb shape. ;

[0036] C. Load the block or honeycomb material into the kiln car, send it to the preheating zone of the oxidation roasting section of the tunnel kiln, and then ignite and roast. The roasting temperature is 700°C and the roasting time is 3 hours;

[0037] D. After the roasted gold ore is cooled in the cooling zone of the oxidation roasting section of the tunnel kiln, it is then sent to the cooling zone between the oxidation roasting sectio...

Embodiment 2

[0044] In a gold mine in Yunnan, more than 90% of the gold is wrapped in pyrite and arsenopyrite in fine granular form. The ore contains S15%, As0.13%, C2%, Sb1%, etc., which is extremely difficult to handle. Mine, pass it through the following process steps;

[0045] A. Grind the above gold ore to 40 mesh;

[0046] B. Add 8% by mass calcium oxide sulfur fixation and arsenic fixation agent to the ground gold ore to make the sulfur and arsenic in the gold ore react with calcium oxide or calcium carbonate to complete the desulfurization and arsenic removal of the gold ore , At the same time, add 1% mass percentage of carbon powder combustion promoter to the ground gold ore, (generally sulfur>8% can be natural), as the fuel for oxidative roasting, after fully mixing, it is made into a block or honeycomb shape ;

[0047] C. Load the block or honeycomb material into the kiln car, send it to the preheating zone of the tunnel kiln oxidation roasting section for drying, and then ignite an...

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Abstract

The present invention provides integral kiln type oxidizing, roasting and gold refining process for refractory gold ore. The roasting, the cyanating and the gold refining are completed in the same tunnel kiln. The present invention has low investment, simple apparatus making, short technological process, easy control, high gold leaching rate, high S and As oxidizing rate, low production cost, easy waste treatment and other advantages.

Description

Technical field [0001] The invention relates to an oxidative roasting gold extraction process method for difficult-to-treat gold ore, and belongs to the technical field of precious metal processing. Background technique [0002] There are a large number of gold mines in nature due to impurities such as sulfur, arsenic, and carbon, which greatly restrict their development and utilization. For a long time, extensive and in-depth research has been conducted on the treatment methods of such gold mines at home and abroad. So far, the main treatment methods for this type of gold ore include: oxidative roasting method, pressurized oxidation method and microbial oxidation method. These methods have been greatly developed in recent years with the advancement of science and technology, and there are some successful application examples. However, these methods still have some unsatisfactory points, such as: (1) The main problems of the oxidation roasting method are: long process flow, large...

Claims

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Application Information

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IPC IPC(8): C22B11/00C22B1/02C22B1/14C22B3/04
CPCY02P10/20
Inventor 陈良忠杨正坤
Owner 云南省地质科学研究所
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