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Method for recycling cyanide through high-pressure circulating countercurrent washing of cyanidation tailings

A high-pressure circulation, countercurrent washing technology, applied in metal cyanide, chemical instruments and methods, simple alkali metal cyanide, etc., can solve the problems of unstable treatment effect, easy generation of sulfur dioxide, affecting process indicators, etc., to achieve environmental and economical Significant social benefits, good washing effect and safe process operation

Inactive Publication Date: 2018-11-13
CHANGCHUN GOLD RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The invention provides a method for recovering cyanide by high-pressure circulation countercurrent washing of cyanide tailings to solve the problem of unstable treatment effect and high processing cost in the purification of cyanide tailings and the recovery of cyanide in gold concentrate biooxidation gold extraction enterprises. Moreover, sulfur dioxide is easily produced during the treatment process, causing secondary pollution. When the treated water is recycled, it will affect the process indicators.

Method used

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  • Method for recycling cyanide through high-pressure circulating countercurrent washing of cyanidation tailings

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Include the following steps:

[0030] (1) Pass the high-concentration cyanide-containing ore slurry into the compacted filter press 14 for pressure filtration to form a filter cake;

[0031] (2) Maintain the compacted state of the filter press, carry out "one-time high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid one;

[0032] (3) Maintain the compacted state of the filter press, carry out "secondary high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid two;

[0033] (4) The washing liquid one directly enters the buffer tank one 1, pumps into the heater 2, and flows into the reactor one 3, reactor two 4, reactor three 5, reactor four 6, buffer tank two 7, and pumps into the middle And tank one 8, self-flow enters neutralization tank two 9, and then enters buffer tank three 10;

[0034] (5) Add an appropriate amount of ...

Embodiment 2

[0051] Include the following steps:

[0052] (1) Pass the high-concentration cyanide-containing ore slurry into the compacted filter press 14 for pressure filtration to form a filter cake;

[0053] (2) Maintain the compacted state of the filter press, carry out "one-time high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid one;

[0054] (3) Maintain the compacted state of the filter press, carry out "secondary high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid two;

[0055](4) The washing liquid one directly enters the buffer tank one 1, pumps into the heater 2, and flows into the reactor one 3, reactor two 4, reactor three 5, reactor four 6, buffer tank two 7, and pumps into the middle And tank one 8, self-flow enters neutralization tank two 9, and then enters buffer tank three 10;

[0056] (5) Add an appropriate amount of c...

Embodiment 3

[0073] Include the following steps:

[0074] (1) Pass the high-concentration cyanide-containing ore slurry into the compacted filter press 14 for pressure filtration to form a filter cake;

[0075] (2) Maintain the compacted state of the filter press, carry out "one-time high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid one;

[0076] (3) Maintain the compacted state of the filter press, carry out "secondary high-pressure washing" with clear water, and the washing liquid evenly passes through the filter cake to produce washing liquid two;

[0077] (4) The washing liquid one directly enters the buffer tank one 1, pumps into the heater 2, and flows into the reactor one 3, reactor two 4, reactor three 5, reactor four 6, buffer tank two 7, and pumps into the middle And tank one 8, self-flow enters neutralization tank two 9, and then enters buffer tank three 10;

[0078] (5) Add an appropriate amount of ...

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Abstract

The invention relates to a method for recycling cyanide through high-pressure circulating countercurrent washing of cyanidation tailings and belongs to the field of environment protection. The methodcomprises the following steps: introducing high-concentration cyanogen-containing ore slurry into a compacted filter press and carrying out press filtering to form a filter cake; washing the filter cake under high pressure and conveying the filter cake into a buffering groove and a reactor; adding a proper amount of concentrated sulfuric acid into the reactor; introducing air with a certain flow into an absorption tower and the reactor by adopting a draught fan; taking a sodium hydroxide solution as an absorption solution and absorbing generated hydrogen cyanide gas to finally produce sodium cyanide; collecting at fixed period and recycling in a cyanidation technology. Aiming at the properties of the cyanidation tailings of gold concentrate smelting industries, an efficient, safe, green and environment-friendly, and economical and practical cyanidation tailing purification and cyanide recycling method is provided; significant environment protection problems of a gold industry are solved, and useful substances are recycled from being wasted; the wastes are changed into valuable things, and the environment, economic and social benefits are remarkable.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a method for treating cyanide tailings in the gold industry and recycling cyanide, in particular to a method for recovering cyanide by high-pressure circulation countercurrent washing of cyanide tailings in a gold concentrate biological oxidation plant. Background technique [0002] Cyanide is widely used in the beneficiation process of the gold industry, especially in gold concentrate smelting enterprises. The cyanide tailings produced by such enterprises have a great impact on the environment and the safety of human life, health and property. The cyanide tailings contain high The concentration of cyanide is huge, highly toxic, difficult to deal with, and expensive to deal with. The current treatment technology is mainly the chemical oxidation method such as sodium pyrosulfite. The treatment effect of this kind of treatment method is unstable and the treatment cost is high...

Claims

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Application Information

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IPC IPC(8): C02F9/04B01D53/78B01D53/54C01C3/10C02F103/16
CPCB01D53/54B01D53/78B01D2251/304B01D2251/604C01C3/10C02F1/001C02F1/66C02F9/00C02F2103/16
Inventor 迟崇哲邱陆明孟凡钰楚金澄
Owner CHANGCHUN GOLD RES INST
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