Method for cleaning cyanide in gold ore tailings

A gold mine tailings and cleaning treatment technology, which is applied in the direction of protection devices against harmful chemicals, can solve the problem of difficult to obtain gold mine tailings, etc., achieve deep decyanation secondary pollution, good decyanation effect, no production The effect of secondary pollution

Pending Publication Date: 2020-12-15
西安弗尔绿创矿业科技有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the industry has provided a method for decyanation treatment of gold ore cyanidation tailings for backfilling. methods such as hydrogen peroxide oxidation or hydrogen peroxide oxidation are not easy to produce secondary pollution for deep dechlorination treatment", but it is often difficult to obtain gold mine tailings with lower content of cyanide by ozone oxidation or hydrogen peroxide oxidation. Research and development An efficient and less costly method for completely removing cyanide from tailings is urgently needed

Method used

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  • Method for cleaning cyanide in gold ore tailings
  • Method for cleaning cyanide in gold ore tailings
  • Method for cleaning cyanide in gold ore tailings

Examples

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Embodiment 1

[0033] A method for cleaning cyanide in gold mine tailings according to the present embodiment, comprising the following steps;

[0034] Step 1. Adjust the pH of the gold mine tailings slurry with concentrated sulfuric acid and / or NaOH to be 8, and 0.5kg of powdered Na 2 S 2 O 5 , 0.2kg powdered CuSO 4 and 1m3 After the above-mentioned pH adjustment, the gold mine tailings slurry is mixed to obtain a mixed slurry;

[0035] In step 2, under the temperature condition of 20°C, the mixed slurry in step 1 is oxidized for 3 hours under aeration conditions to obtain a slurry after the reaction; the aeration is performed by using an air pump to inflate the mixed slurry in step 1. The inflation rate is 12.5L / (m 3 min), where m 3 Corresponds to the volume of the gold mine tailings slurry after pH adjustment in step 1.

[0036] Detection: take 10 mL of the supernatant of the reacted slurry, and measure the cyanide content of the supernatant according to "HJ484-2009 Determination of...

Embodiment 2

[0039] A method for cleaning cyanide in gold mine tailings according to the present embodiment, comprising the following steps;

[0040] Step 1. Adjust the pH of the gold mine tailings slurry to 9 with concentrated sulfuric acid and / or NaOH, and mix 0.5kg of powdered Na 2 S 2 O 5 , 0.2kg powdered CuSO 4 and 1m 3 After the above-mentioned pH adjustment, the gold mine tailings slurry is mixed to obtain a mixed slurry;

[0041] In step 2, under the temperature condition of 20°C, the mixed slurry in step 1 is oxidized for 3 hours under aeration conditions to obtain a slurry after the reaction; the aeration is performed by using an air pump to inflate the mixed slurry in step 1. The inflation rate is 12.5L / (m 3 min), where m 3 Corresponds to the volume of the gold mine tailings slurry after pH adjustment in step 1.

[0042] Detection: take 10 mL of the supernatant of the reacted slurry, and measure the cyanide content of the supernatant according to "HJ484-2009 Determination...

Embodiment 3

[0045] A method for cleaning cyanide in gold mine tailings according to the present embodiment, comprising the following steps;

[0046] Step 1. Adjust the pH of the gold mine tailings slurry to 10 with concentrated sulfuric acid and / or NaOH, and mix 0.5kg of powdered Na 2 S 2 O 5 , 0.2kg powdered CuSO 4 and 1m 3 After the above-mentioned pH adjustment, the gold mine tailings slurry is mixed to obtain a mixed slurry;

[0047] In step 2, under the temperature condition of 20°C, the mixed slurry in step 1 is oxidized for 3 hours under aeration conditions to obtain a slurry after the reaction; the aeration is performed by using an air pump to inflate the mixed slurry in step 1. The inflation rate is 12.5L / min (m 3 min), where m 3 Corresponds to the volume of the gold mine tailings slurry after pH adjustment in step 1.

[0048] Detection: take 10 mL of the supernatant of the reacted slurry, and measure the cyanide content of the supernatant according to "HJ484-2009 Determin...

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Abstract

The invention discloses a method for cleaning cyanide in gold ore tailings, which comprises the following steps: 1. mixing powdery Na2S2O5, powdery CuSO4 and gold ore tailing slurry with the pH valueof 9-11 to obtain mixed slurry; 2, carrying out an oxidation reaction on the mixed slurry under an aeration condition to obtain reacted slurry; 3, adjusting the pH value, and adding hydrogen peroxideto obtain hydrogen peroxide-containing slurry; 4, carrying out an oxidation reaction on the hydrogen peroxide-containing slurry for 1-8h under an aeration condition to obtain reacted slurry; and fifthly, the pH is adjusted, filtering is conducted, and the gold ore tailings obtained after cleaning treatment are obtained. According to the method, powdery Na2S2O5, powdery CuSO4 and hydrogen peroxideare used as raw material reagents, cyanide in the gold ore tailings is removed through a two-step oxidation reaction under the inflation condition, the content of cyanide in the treated gold ore tailings leachate can be reduced to 0.05 mg / L, and the technical specification requirements of gold ore tailings backfilling are fully met.

Description

technical field [0001] The invention belongs to the technical field of gold mine tailings treatment, in particular to a method for cleaning cyanide in gold mine tailings. Background technique [0002] Gold extraction by cyanidation is widely used in the field of gold ore. The granular gold is converted into Au(CN) by soaking the ore particles in a cyanide aqueous solution after grinding. 2 - into the solution, and then the gold is precipitated out of the solution by methods such as precipitation. As a raw material for gold extraction by cyanidation, cyanide will inevitably remain in the wastewater and tailings generated in the process of gold extraction by cyanide. The impact on human health and the environment is extremely serious. [0003] The removal of cyanide in tailings and wastewater is mainly based on biological removal, physical removal, chemical removal and electrolytic oxidation removal. Currently, the commonly used methods include chlor-alkali method, activate...

Claims

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Application Information

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IPC IPC(8): A62D3/38A62D101/45
CPCA62D3/38A62D2101/45Y02P10/20
Inventor 侯东壮刘浪郇超杨奇星邱华富张波王美周文武秦学斌赵玉娇王湃张小艳屠冰冰李艳孙伟博
Owner 西安弗尔绿创矿业科技有限责任公司
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