Method for comprehensively recovering cyanide-containing wastewater

A technology for cyanide wastewater and wastewater is applied in the field of comprehensive recovery of cyanide-containing wastewater, which can solve problems such as unreasonable methods for cyanide-containing wastewater

Inactive Publication Date: 2015-09-02
BEIJING GENERAL RES INST OF MINING & METALLURGY
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Problems solved by technology

[0005] The present invention provides a method for comprehensive recovery of cyanide-containing wastewater

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  • Method for comprehensively recovering cyanide-containing wastewater
  • Method for comprehensively recovering cyanide-containing wastewater

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[0025] In order to not only improve the recovery rate of cyanide, but also realize the up-to-standard discharge of cyanide ions in wastewater, the present invention provides a method for comprehensive recovery of cyanide-containing wastewater. The process technology includes four parts: wastewater acidification activation, solid-liquid separation and comprehensive Recovery, stripping-absorption of acidizing liquid, deep oxidation treatment of stripping liquid. Specifically, the activation of wastewater acidification is mainly to add non-oxidizing acid to the acidification tower containing the cyanide-containing wastewater to adjust the pH value. The solid-liquid separation is for the recovery of valuable metals, and the solid-liquid separation of the cyanide-containing wastewater after acidification. During comprehensive recovery, the pH value of the cyanide-containing filtrate is adjusted, and then the cyanide-containing filtrate is put into the industrial production process ...

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Abstract

The invention relates to a method for comprehensively recovering cyanide-containing wastewater, which comprises the following steps: (1) adding non-oxidizing acid into an acidification tower filled with cyanide-containing wastewater to regulate the pH value, and complexing and precipitating metals in the cyanide-containing wastewater to acidify and activate the cyanide-containing wastewater; (2) carrying out solid-liquid separation on the cyanide-containing wastewater to recover valuable metals; (3) reutilization of the cyanide-containing filtrate obtained after separation: regulating the pH value of the cyanide-containing filtrate, and adding the cyanide-containing filtrate into the industrial production process for reutilization; (4) if the cyanide-containing filtrate needs to be discharged, sending the cyanide-containing filtrate into an air stripping-absorbing apparatus to remove and recover HCN from the cyanide-containing filtrate; and (5) carrying out deep oxidization on the filtrate subjected to air stripping until the filtrate achieves the discharge standard. The technical process has the advantages of low operating cost, high efficiency and low reagent consumption, can recover most cyanides and comprehensively recover copper, lead, zinc and other valuable metals, and converts the wastewater into harmless substances and resources.

Description

technical field [0001] The application relates to a wastewater purification process, in particular to a method for comprehensively recovering cyanide-containing wastewater. Background technique [0002] Cyanide is widely used in cyanide gold extraction, cyanide electroplating metal (such as brass or copper, etc.) industries; as a chemical raw material, cyanide is also widely used in synthetic rubber, chemical fiber production and dye industries. The production process must discharge a certain amount of cyanide-containing wastewater. [0003] In 2009, the total amount of cyanide in my country's industrial wastewater was 14053t, and the discharge of cyanide to the environment was 250.3t. Only cyanide gold extraction enterprises discharge about 20 million tons of cyanide tailings and about 5 million m3 of cyanide-containing wastewater every year 3 , cyanide-containing wastewater is highly toxic and widely distributed, and is a serious threat to human health and the lives of l...

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Application Information

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IPC IPC(8): C02F9/04C02F9/10C02F101/18
Inventor 孙留根王云黄海辉常耀超孙彦文徐晓辉靳冉公
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY
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