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Cyanogen-containing barren liquor purification treatment and comprehensive utilization method

A technology for purification treatment and lean liquid, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage treatment, etc., can solve the problems of low comprehensive utilization value and high cost, reduce treatment costs, and simplify the process flow. Effect

Inactive Publication Date: 2016-06-08
SHANDONG GUODA GOLD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At the same time, in the process of roasting flue gas to produce sulfuric acid, a large amount of low-concentration waste acid (dilute acid) and flue gas tail gas are produced. The main component of tail gas is SO 2 and SO 3 , at present, low-concentration waste acid (dilute acid) mainly adopts acid-base neutralization separate treatment technology, and flue gas tail gas mainly adopts electrostatic demisting technology, but whether it is a separate treatment of waste acid (dilute acid) or flue gas tail gas is faced with High cost and low comprehensive utilization value

Method used

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Examples

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Effect test

Embodiment 1

[0023] A method for comprehensive utilization of cyanogen-containing barren liquid purification treatment, comprising the following steps:

[0024] 1) Primary treatment: the total cyanide content obtained after replacing the precipitated gold and silver with the cyanide gold extraction process is 1400mg / L, and the gold content is 0.015g / m 3 , the silver content is 0.06g / m 3 , the copper content is 0.6g / L cyanide-containing barren liquid and the sulfuric acid concentration of 1wt% waste acid produced by the roasting acid production process is mixed in the storage tank, adjusted to pH=7, and the resulting mixed solution is pumped to the top of the absorption tower , while roasting the SO produced by the acid production process 2 with SO 3 The acid production tail gas with a total volume content of 0.08% enters the bottom of the absorption tower, and the gas-liquid two-phase countercurrent fully contacts and reacts, and the flow rate of the mixed liquid is 5m 3 / h, the flow ra...

Embodiment 2

[0028] A method for comprehensive utilization of cyanogen-containing barren liquid purification treatment, comprising the following steps:

[0029] 1) Primary treatment: the total cyanide content obtained after replacing the precipitated gold and silver with the cyanidation gold extraction process is 1750mg / L, and the gold content is 0.02g / m 3 , the silver content is 0.08g / m 3 , the copper content is 0.85g / L cyanide-containing barren liquid and the sulfuric acid concentration of 2wt% waste acid produced by the roasting acid production process is mixed in the storage tank, adjusted to pH=7.5, and the resulting mixed solution is pumped to the top of the absorption tower , while roasting the SO produced by the acid production process 2 with SO 3 The acid production tail gas with a total volume content of 0.1% enters the bottom of the absorption tower, and the gas-liquid two-phase countercurrent fully contacts and reacts, and the flow rate of the mixed liquid is 7.5m 3 / h, the ...

Embodiment 3

[0033] A method for comprehensive utilization of cyanogen-containing barren liquid purification treatment, comprising the following steps:

[0034]1) Primary treatment: the total cyanide content obtained after replacing the precipitated gold and silver with the cyanidation gold extraction process is 2100mg / L, and the gold content is 0.03g / m 3 , the silver content is 0.10g / m 3 , the copper content is 1.10g / L cyanide-containing barren liquid and the sulfuric acid concentration that the roasting acid production process produces is 3wt% spent acid and mixes in the storage tank, adjusts to pH=8, and pumps the obtained mixture to the top of the absorption tower , while roasting the SO produced by the acid production process 2 with SO 3 The acid production tail gas with a total volume content of 0.12% enters the bottom of the absorption tower, and the gas-liquid two-phase countercurrent fully contacts and reacts, and the flow rate of the mixed liquid is 5m 3 / h, the flow rate of t...

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Abstract

The invention relates to a cyanogen-containing barren liquor purification treatment and comprehensive utilization method. By using smoke acid production tail gas, waste acid (diluted acid) and cyanogen-containing barren liquor generated after cyanogenation gold extracting, decyanation is performed by means of a secondary treatment technology; a primary treatment technology comprises the steps of performing a neutral reaction by the cyanogen-containing barren liquor, the waste acid and the acid production tail gas, producing cuprous rhodanide sediment in the reaction, controlling PH to be 5-6 at the endpoint of the reaction, filtering to recycle cuprous rhodanide, and for liquid after the neutral reaction, adjusting PH to be 7-8 by using NaOH, thus obtaining liquid after primary treatment; the secondary treatment technology comprises the steps of adding sodium pyrosulfite, FeSO4 and H2O2 into the liquid after the primary treatment, and performing decyanation by an air oxidation blow-off method. The GB8978-1996 integrated wastewater discharge standard is reached, and meanwhile harmless recycling is truly realized.

Description

technical field [0001] The invention relates to a comprehensive utilization method for high-efficiency purification treatment of barren liquid containing cyanide, and belongs to the technical fields of gold smelting waste liquid, chemical industry waste gas treatment and environmental protection. Background technique [0002] At present, the cyanide method is mainly used to extract gold and silver in my country's gold production. Although cyanide extraction of gold and silver is an economical and effective method, since cyanide leaching is used to extract gold and silver, and cyanide is a highly toxic chemical, the resulting Waste liquid discharge and treatment require a lot of treatment costs, so the barren solution after cyanide leaching and gold extraction, that is, the barren solution containing cyanide, is basically returned to the system for recycling. Although most of the cyanide-containing poor solution is returned to use, there are still some cyanide-containing was...

Claims

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Application Information

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IPC IPC(8): C02F1/66C02F1/72C02F1/20C02F101/18C02F103/16
CPCC02F1/66C02F1/20C02F1/722C02F2101/18C02F2103/16
Inventor 王建政孔令强梁志伟朱德兵郭建东
Owner SHANDONG GUODA GOLD
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