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One-furnace-two-section boiling baking process

A boiling roasting and roasting technology, which is applied in the field of boiling roasting technology, can solve problems such as environmental pollution, and achieve the effects of improving comprehensive recovery rate, improving leaching rate and saving energy.

Inactive Publication Date: 2007-12-05
CHINA NAT GOLD GROUP CORP TECH CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a two-stage boiling roasting process in one furnace, which not only solves the problem of oxidation of sulfide and carbon substances, but also solves the problem of secondary gold wrapping; the natural decomposition of carbonate minerals is used in the roasting process. Self-cleaning and curing of arsenic, sulfur and other oxides, effectively solving the problems of environmental pollution in the roasting process

Method used

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  • One-furnace-two-section boiling baking process
  • One-furnace-two-section boiling baking process
  • One-furnace-two-section boiling baking process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Grind the above-mentioned refractory gold ore until the content of -0.074mm accounts for 90%, and conduct different atmosphere and different roasting temperature tests in a single-stage roasting furnace, and the roasting time is 45 minutes;

[0036] The firing atmospheres are: air (21% oxygen);

[0037] Oxygen-enriched (75% oxygen);

[0038] Depleted of oxygen (10% oxygen);

[0039] Different temperature: 550°C; 600°C; 650°C; 700°C;

[0040] The results of the carbon leaching gold recovery roasting test are shown in Table 7:

[0041] Table 7 Test results of single-stage calcination at different temperatures and different atmospheres

[0042] Test results: Poor oxygen is better than air, and air is better than rich oxygen; high temperature is better than low temperature. From the test results of single-stage roasting at different temperatures and different atmospheres, the experimental research results are generally low, and the gold recovery index is not ideal.

Embodiment 2

[0044] As shown in accompanying drawing 1, under different atmosphere conditions, different temperature two-stage roasting tests have been carried out to ore, two-stage roasting time is respectively 45min, 30min, 60min, roasting test procedure is:

[0045] Step 1 is roasting material preparation:

[0046] The refractory gold ore in Example 1 was passed through a dry grinding process, and the grinding particle size -0.074mm accounted for 90%; the water content of the ore after dry grinding was less than 2%; the proportion of coal added was 3%;

[0047] Step 2 is the first stage of roasting:

[0048] Through the sealed screw feeder 1, it is fed into the fluidized roasting front chamber 2 of the fluidized roasting furnace for the first stage of roasting; the materials fed into the fluidized roasting front chamber 2 of the fluidized roasting furnace are strictly controlled according to the ore properties. The main parameters such as the air supply volume, the oxygen content of th...

Embodiment 3

[0057] As shown in accompanying drawing 1 and on the basis of embodiment 2, comprehensive optimal working condition has been carried out to expand continuous verification test, and test procedure is identical with embodiment 2, and test parameter is as follows:

[0058] Roasting test ore processing capacity: 8t / d

[0059] Coal burning ratio: 2.8%

[0060] Material particle size: -0.074mm content accounts for 90%

[0061] Two-stage roasting test:

[0062] Roasting temperature: one-stage roasting 680℃~700℃;

[0063] Two-stage roasting at 680°C to 700°C;

[0064] Roasting atmosphere: air is used for the first and second stage roasting, and the oxygen content of the air is 21%

[0065] Roasting time: a period of 30min

[0066] 30 minutes for the second stage

[0067] Air supply volume: a section of 84m 3 / h

[0068] Section 2 84m 3 / h

[0069] The test steps are as follows:

[0070] Step 1 is roasting material preparation:

[0071] The refractory gold ore of Example 1 ...

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Abstract

The present invention is two-section fluidizing and roasting process for intractable gold bearing ore. The two-section fluidizing and roasting process includes the following steps: preparing material, roasting of the material one sealed spiral feeder provides to the roasting furnace in the first section, and roasting of the material passing through the passage in the bottom of the partition wall in the second section. During roasting in the second section, the air supply amount is controlled properly so that the sulfide and carbide in the ore may be oxidized completely. The present invention has the advantages of capacity of avoiding the secondary loss of dissolved gold, raised gold leaching rate, raised comprehensive recovery rate, environment friendship, etc.

Description

technical field [0001] The invention relates to a boiling roasting process of refractory gold ore, in particular to a one-furnace two-stage boiling roasting process. Background technique [0002] As we all know, the characteristics of refractory gold ore are firstly containing sulfide, secondly, the gold is in the state of fine particles, and thirdly, containing carbonaceous matter; the boiling roasting process of refractory gold ore has been successfully applied to industrial production abroad, mainly for rich Oxygen roasting, the oxygen content is generally 50% to 100%. The advantage of oxygen-enriched roasting is that the ore can be burned rapidly at a relatively low temperature. In this way, the unit processing capacity of the equipment is 3 to 5 times that of ordinary equipment, and the sulfide and carbonaceous substances in the ore are completely oxidized and burned. The recovery rate is high. In addition, pure oxygen is used for roasting, and the amount of flue gas p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B1/14C22B11/00C22B3/04
CPCY02P10/20
Inventor 张清波汪丹鲁玉春谷志君
Owner CHINA NAT GOLD GROUP CORP TECH CENT
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