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Method for leaching secondarily coated gold hematite

A secondary wrapping and hematite technology, applied in the direction of silicon dioxide, process efficiency improvement, silicon oxide, etc., can solve the problems of poor iron removal effect, high energy consumption, complicated process flow, etc., and achieve iron leaching speed Fast, low energy consumption, high iron leaching rate effect

Active Publication Date: 2020-08-11
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the technical problems existing in the prior art, the present invention provides a method for leaching secondary wrapped gold hematite to solve the poor iron removal effect of the ore samples containing hematite secondary wrapped gold in the prior art, which can Technical problems such as high energy consumption and complex process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] Using the method for leaching secondary wrapped gold hematite to remove iron from a certain second-stage roasting cyanide tailings, wherein the gold content in the second-stage roasting cyanide tailings is as high as 13.03g / t, and the iron content is 30.60 %, specifically including the following steps:

[0035] Step 1. Take 200g of the above-mentioned second-stage calcined cyanidation tailings slag, and add the second-stage calcine cyanidation tailings slag and water into the leaching tank according to the liquid-solid ratio of 4mL / 1g to obtain a mixed pulp;

[0036] Step 2, adding solid oxalic acid and potassium oxalate into the leaching tank of step 1 according to the ratio of molar mass ratio of 1:1; adding oxalic acid and oxalate and stirring to obtain leached pulp; wherein, the leached pulp contains C 2 o 4 2- The molar mass is 3.9 times of the total iron molar mass in the second stage calcination cyanidation tailings slag;

[0037] Step 3. The leached pulp was ...

Embodiment 2

[0041] Using the method for leaching secondary gold-hematite leaching to remove iron from a certain roasted cyanide tailings, the gold content in the roasted cyanide tailings is 4g / t, and the iron content is 38.00%, specifically including the following steps:

[0042] Step 1. Weighing 200g of the above-mentioned roasted cyanide tailings, and adding the roasted cyanide tails and water into the leaching tank according to the liquid-solid ratio of 6mL / 1g;

[0043] Step 2, adding solid oxalic acid and ammonium oxalate into the leaching tank of step 1 according to the ratio of molar mass ratio of 0.98:1.05, adding oxalic acid and ammonium oxalate and stirring to obtain leached pulp, and C in the leached pulp 2 o 4 2- The molar mass of is 4.02 times of the total iron molar mass in the roasted cyanidation tailings;

[0044] Step 3. The leached pulp was stirred and leached at 90°C for 60 minutes, then filtered and separated to obtain leaching slag and leaching solution; the leaching...

Embodiment 3

[0048] Using the method for leaching secondary gold-hematite leaching to remove iron from certain sulfuric acid slag, the contents of gold, silver, copper, lead, zinc and iron in the slag are respectively 4g / t, 110g / t, and 0.6% ﹑1.0%, 2.2% and 57%, including the following steps:

[0049] Step 1, take 30g of the above-mentioned sulfuric acid slag, and add the sulfuric acid slag and water into the leaching tank according to the liquid-solid ratio of 6mL / 1g;

[0050] Step 2, adding solid oxalic acid and ammonium oxalate into the leaching tank of step 1 with a molar mass ratio of 1:1, adding oxalic acid and ammonium oxalate and stirring to obtain leached pulp, and C in the leached pulp 2 o 4 2- The molar mass is 5.2 times of the total iron molar mass in the sulfuric acid slag;

[0051] Step 3. Stir and leach the leached pulp at 80°C, filter and separate after leaching for 90 minutes, and obtain leaching slag and leaching liquid. The leaching slag is the iron removal slag, and t...

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Abstract

The invention discloses a method for leaching secondarily coated gold hematite. The method comprises the steps that firstly, a secondarily coated gold core sample including hematite is mixed with water, and mixed ore pulp is obtained; an oxalic acid and oxalate mixed reagent is added into the mixed ore pulp, continuous stirring is carried out in the adding process, and leached ore pulp is obtained; and the leached ore pulp is stirred and leached, filtering and separating are carried out, and leaching residues and leachate are obtained, wherein the leaching residues are deironed slag. Accordingto the method for leaching the secondarily coated gold hematite, the oxalic acid and oxalate mixed solution is added into the secondarily coated gold core sample including the hematite, Fe(C2O4)3<3->with a large cumulative stability constant is generated through the high complexing action of C2O4<2-> on Fe3+, the hematite in the secondarily coated gold core sample including the hematite is leached in a complexing manner, the leaching speed is high, and the leaching rate is high and reaches up to 95% or above; and the leaching process is low in energy consumption, the equipment in the deironing process is simple, environmental pollution is low, and the industrialization is easy.

Description

technical field [0001] The invention relates to the technical field of pretreatment and iron removal of hematite-wrapped refractory gold ore resources, in particular to a method for leaching secondary-wrapped gold hematite. Background technique [0002] At present, the bulk industrial wastes containing hematite and gold mainly include the roasting cyanidation tailings produced by the gold smelting industry and the sulfuric acid slag produced by the synthetic sulfuric acid industry. The biggest feature of gold industrial production that is different from other metal production is that the tailings yield is close to 100%, while the synthetic sulfuric acid industry produces about 0.8 sulfuric acid slag per 1 ton of sulfuric acid produced. According to statistics, the annual discharge of cyanidation tailings by my country's gold smelting enterprises is about 24.5 million tons, and the annual discharge of sulfuric acid slag by the synthetic sulfuric acid industry exceeds 10 milli...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/16C22B11/08C22B11/00C01B33/12
CPCC22B3/1616C22B11/04C22B11/08C01B33/12Y02P10/20
Inventor 党晓娥刘安全李林波刘佰龙
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY