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Cyanide sludge sintering cyanide removal process, cyanide-free brick, cyanide sludge sintering cyanide removal system and its application

A sludge and process technology, applied in the field of cyanide sludge disposal and utilization, can solve the problems of incomplete removal of cyanide, harsh manual operation requirements, high investment and operation cost, achieve good weather resistance and durability, reduce pollution, The effect of low disposal costs

Active Publication Date: 2021-11-05
BEIJING GENERAL RES INST OF MINING & METALLURGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] One of the purposes of the present invention is to provide a cyanide sludge sintering process for removing cyanide, so as to alleviate the technical problems of the existing technology such as complex process flow, high investment and operation cost, harsh manual operation requirements and incomplete cyanide removal

Method used

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  • Cyanide sludge sintering cyanide removal process, cyanide-free brick, cyanide sludge sintering cyanide removal system and its application
  • Cyanide sludge sintering cyanide removal process, cyanide-free brick, cyanide sludge sintering cyanide removal system and its application
  • Cyanide sludge sintering cyanide removal process, cyanide-free brick, cyanide sludge sintering cyanide removal system and its application

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Effect test

Embodiment 1

[0117] This embodiment provides a kind of cyanide-free brick sintered from cyanide sludge, and the technological process is as follows: figure 1 As shown, the specific process is as follows:

[0118] (1) Crush the gangue and coal powder to less than 2mm, and mix them evenly to obtain combustibles. Get the newly discharged cyanide sludge for subsequent use, wherein the water content of the cyanide sludge is 25%, and the cyanide content is 22.1mg / kg.

[0119] (2) Extrude the cyanide sludge and combustibles with a mass ratio of 70:30 through a mixed extrusion molding machine to obtain a wet billet, and the extrusion molding pressure is 3MPa.

[0120] (3) The wet billet is loaded on the kiln car by robot cross-stacking, and transported to the closed drying kiln by rails for drying and dehydration. The temperature of the airtight drying kiln is 250°C, and the pressure of drying and dehydration is -80Pa. When the moisture content in the wet billet drops below 6%, the calcined billet...

Embodiment 2

[0124] This embodiment provides a cyanide-free brick sintered from cyanide sludge. The difference from Embodiment 1 is that the oxygen content in the closed kiln is 10%, and other steps and process conditions are the same as in Embodiment 1. Let me repeat.

Embodiment 3

[0126] This embodiment provides a kind of cyanide-free brick sintered from cyanide sludge. The difference from Embodiment 1 is that the oxygen content in the closed firing kiln is 5%, and other steps and process conditions are the same as in Embodiment 1. Let me repeat.

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Abstract

The invention provides a cyanide sludge sintering cyanide removal process, cyanide-free bricks, cyanide sludge sintering cyanide removal system and application, and specifically relates to the technical field of cyanide sludge disposal and utilization. The process of sintering and removing cyanide from cyanide sludge is to sinter and remove cyanide after mixing cyanide sludge and combustibles to obtain cyanide-free bricks. Cyanide sludge and combustibles are preferably mixed according to the mass ratio of 70~95:5~30. The oxygen concentration is greater than 10% during sintering for cyanide removal. It is 24~36h. The cyanide sludge sintering and cyanide removal process provided by the present invention has a cyanide removal rate of over 99.9%, and the waste heat of the sintering kiln is reused in the process, and the comprehensive energy consumption and disposal cost are low; the mechanical automation degree in the process is high, and the final product has no impact on the process. The method is environmentally friendly, and cyanide-free bricks with economic value are obtained, which are suitable for large-scale use in the field of cyanidation tailings treatment in industries such as gold.

Description

technical field [0001] The invention relates to the technical field of cyanide sludge disposal and utilization, in particular to a cyanide sludge sintering and cyanide removal process, a cyanide-free brick, a cyanide sludge sintering cyanide removal system and applications. Background technique [0002] Most of the finished gold production enterprises adopt the cyanide gold extraction process, so a large amount of cyanide slag is produced every year. The output of cyanide tailings in my country's gold industry is about 100 million tons per year. At present, the decyanation treatment methods of cyanide slag include ozone oxidation, solid-liquid separation washing method, Inco method, natural degradation method, high temperature hydrolysis method, etc. These methods mainly have the following defects: [0003] Complex process; [0004] High investment and operation costs; [0005] Manual operation is demanding; [0006] Cyanide removal is not complete. [0007] In v...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B33/132C04B33/135C04B33/32C04B38/06A62D3/38
CPCA62D3/38C04B33/132C04B33/1321C04B33/1328C04B33/135C04B33/32C04B38/068C04B2235/422C04B2235/6583Y02P40/60
Inventor 杨航李勇李伟光赵庆朝朱阳戈
Owner BEIJING GENERAL RES INST OF MINING & METALLURGY