A method for leaching secondary wrapped gold hematite

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

Active Publication Date: 2022-01-18
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • 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 secondary-coated gold hematite. First, the secondary-coated gold ore sample containing hematite is mixed with water to obtain a mixed pulp; oxalic acid and an oxalate mixed reagent are added to the mixed pulp, The process is continuously stirred to obtain the leached ore pulp; the leached ore pulp is stirred and leached, filtered and separated to obtain the leaching slag and the leachate; the leaching slag is the iron removal slag; The mixed solution of oxalic acid and oxalate was added to the secondary wrapped gold ore sample of hematite, and the C 2 o 4 2‑ to Fe 3+ Has a strong complexation to generate Fe(C 2 o 4 ) 3 3‑ , complex leaching of hematite containing hematite secondary wrapped gold ore samples, fast iron leaching speed, high iron leaching rate, iron leaching rate is as high as more than 95%, low energy consumption in the leaching process, simple iron removal process equipment, The environmental pollution is small, and it is easy to industrialize.

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 Patents(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
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