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Comprehensive utilization method of iron ions in pressurized leaching solution of arsenic-bearing gold ore

A technology of pressurized leaching and leaching solution, which is applied in the direction of improving process efficiency, can solve problems such as increasing costs, and achieve the effects of acid balance, smooth flow, and reduction of chemical consumption.

Active Publication Date: 2019-04-23
ZIJIN MINING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] In order to save the amount of acid, it can be considered to use the acid solution of pressurized oxidation leaching when decomposing carbonate, but for gold concentrate with low sulfur content (25%) Ore (medium) ore, due to the lack of acid produced by oxidation, it is necessary to add sulfuric acid in the process of decomposing carbonate and add alkali when neutralizing and removing impurities, thus increasing the cost

Method used

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  • Comprehensive utilization method of iron ions in pressurized leaching solution of arsenic-bearing gold ore
  • Comprehensive utilization method of iron ions in pressurized leaching solution of arsenic-bearing gold ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0057] A gold concentrate contains 15.2% sulfur, 21% iron, 3.2% arsenic, and 41.5% carbonate (calculated as calcium carbonate). Add concentrated sulfuric acid to start, and then return the oxidative leaching solution 6 of liquid-solid separation to stir and acidify to decompose carbonate, acidify solution 3 to neutralize and remove impurities, first add lime at 180kg / t to start, and then return the remaining oxidative leaching solution 6 of liquid-solid separation to return Neutralize and remove impurities.

[0058] Adopt the method of the present invention, concrete operation steps and technological parameters are as follows:

[0059] (1) Oxidative leaching solution 6 contains H 2 SO 4 42.1g / L, with Fe 3+ 21g / L.

[0060] (2) the gold essence (middle) ore before entering the autoclave and the oxidation leaching solution 6 of step D carry out agitation acidification reaction, decompose carbonate, and the reaction is carried out in three series-connected stirring tanks, and ...

Embodiment 2

[0064] A gold concentrate (middle) ore contains 12.3% sulfur, 19.1% iron, 1.6% arsenic, and 30.06% carbonate (calculated as calcium carbonate), and the oxidized liquid after pressurized oxidation produces 150kg / t of acid, according to 144kg / t t First add concentrated sulfuric acid to start, then return the oxidative leaching solution 6 of liquid-solid separation to agitation and acidify to decompose carbonate, and acidify solution 3 to neutralize and remove impurities. 6 Return to neutralize and remove impurities.

[0065] Adopt the method of the present invention, concrete operation steps and technological parameters are as follows:

[0066] (1) Oxidative leaching solution 6 contains H 2 SO 4 34g / L, with Fe 3+ 19.1g / L.

[0067] (2) the gold essence (middle) ore before entering the autoclave and the oxidation leaching solution 6 of step D carry out agitation and acidification reaction, decompose carbonate, the reaction is carried out in three series-connected stirring tank...

Embodiment 3

[0071] A gold concentrate (medium) ore contains 10.8% sulfur, 14.4% iron, 0.9% arsenic, and 25.04% carbonate (calculated as calcium carbonate), and the oxidizing liquid produces 132kg / t of acid after pressurized oxidation, according to 113kg / t t First add concentrated sulfuric acid to start, then return the oxidative leaching solution 6 of liquid-solid separation to agitation and acidify to decompose carbonate, and acidify solution 3 to neutralize and remove impurities. 6 Return to neutralize and remove impurities.

[0072] Adopt the method of the present invention, concrete operation steps and technological parameters are as follows:

[0073] (1) The pressurized leaching solution contains H 2 SO 4 31g / L, with Fe 3+ 18.2g / L.

[0074] (2) the gold concentrate slurry before entering the autoclave and the oxidative leaching solution 6 of step D carry out agitation acidification reaction, decompose carbonate, the reaction is carried out in three series-connected stirring tanks...

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Abstract

The invention relates to a comprehensive utilization method of iron ions in pressure leaching solutions of arsenic-bearing gold mine. The comprehensive utilization method is carried out according to the following steps and conditions that three-stage stirring acidification is conducted, gold concentrates (middlings) and oxidation leaching solutions which are first started with sulfuric acid and then obtained through a step D are stirred into pulp and subjected to an acidification reaction, carbonate is decomposed, the reaction is carried out in first to third stirring tanks which are connectedin series, and the oxidation leaching solutions are added according to the calculated value of the formula V=980*Omega / CH2SO4+2.625CFe3+; thickening is conducted, acidized mine pulp is added into a thickener for sedimentation, then alkali is first added to acidizing fluid, and residual oxidation leaching solutions are used for neutralization impurity removal after start; pressurization oxidationis carried out, and acidized mine pulp underflow is added into a high pressure autoclave for pressurization oxidation under a certain condition; and liquid-solid separation is carried out, liquid-solid separation is conducted on the acidized mine pulp, oxidation leaching solutions containing H2SO430-50g / L and Fe3+18-25g / L are obtained, and the oxidation leaching solutions are stored in a solutiontank for recycling. Iron in the oxidation leaching solutions is utilized to replace the sulfuric acid and the alkali to realize acid balance of the system, stabilize the mine pulp sedimentation effect, guarantee process smoothness and prevent Fe(OH)3 generated by hydrolysis from forming colloid, and the comprehensive utilization method has the beneficial effects of being economical, simple, efficient and the like, and is applicable to similar oxygen pressure factories.

Description

technical field [0001] The invention relates to a comprehensive utilization method of iron ions in a pressurized leaching solution of arsenic-containing gold ore, which is suitable for applications similar to oxygen pressure factories. Background technique [0002] There are many types of gold deposits in my country, among which gold is sulfided such as pyrite FeS 2 , arsenopyrite FeAsS and other packages are one of the main reasons for the low gold extraction rate of refractory gold mines. In the prior art, pressurized oxidation is the most efficient process for treating sulfide-coated gold ores because of the pyrite FeS 2 There are two parallel competing reactions in the oxidation under high temperature and high pressure conditions: [0003] FeS 2 +7 / 2O 2 +H 2 O=FeSO 4 +H 2 SO 4 (1) [0004] FeS 2 +2O 2 =FeSO 4 +S 0 (2) [0005] There are also two reactions in the oxidation of arsenopyrite FeAsS: [0006] 2FeAsS+13 / 2O 2 +3H 2 O=3H 3 AsO 4 +2FeSO 4 (3...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/08C22B11/00
CPCC22B3/08C22B11/04Y02P10/20
Inventor 陈景河蔡创开王春熊明许晓阳丁文涛郭金溢黄怀国陈庆根
Owner ZIJIN MINING GROUP