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Method for harmlessly treating cyaniding tailings by utilizing microcrystalline glass granule surface crystallization process

A technology of cyanide tailings and glass-ceramics, which is applied in glass forming, glass manufacturing equipment, manufacturing tools, etc., can solve the problems of limited demand and achieve comprehensive utilization and significant economic benefits

Active Publication Date: 2021-02-23
BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] At present, the mainstream method for the disposal of cyanide tailings in the gold smelting industry is to store them temporarily in the designed hazardous solid waste tailings pool or export them to qualified cement factories for processing, because the cyanide tailings contain highly toxic cyanide. Chemicals, the demand of qualified cement plants is very limited

Method used

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  • Method for harmlessly treating cyaniding tailings by utilizing microcrystalline glass granule surface crystallization process
  • Method for harmlessly treating cyaniding tailings by utilizing microcrystalline glass granule surface crystallization process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] Cyanide tailings (moisture content 10%) after pressure filtration and dehydration are dispersed by a disperser (feeding particle size is 20mm).

[0054] Transport the broken cyanide tailings material to the rotary kiln for primary roasting at a temperature of 700°C for 30 minutes and a negative pressure of -30kpa to remove part of the cyanide and all of the cyanide in the cyanide tailings moisture.

[0055] The cyanide tailings after the primary roasting are transported to the roasting kiln for secondary roasting. The roasting temperature is 600°C and the time is 90 minutes. The high temperature is fully decomposed, and the decyanation tailings are obtained after the material is cooled, which is transported to the material plant for storage.

[0056] The decyanation tailings are crushed to 3mm by a crusher, the particle size of the auxiliary components is 2mm, the decyanation tailings account for 40.0wt.% of the total weight of raw materials, the auxiliary raw material...

Embodiment 2

[0062] Cyanide tailings (moisture content 15%) after pressure filtration and dehydration are dispersed by a disperser (incoming particle size is 15mm).

[0063] Transport the broken cyanide tailings material to a rotary kiln for primary roasting at a temperature of 750°C for 40 minutes and a negative pressure of -40kpa to remove part of the cyanide and all of the cyanide in the cyanide tailings moisture.

[0064] The cyanide tailings after the primary roasting are transported to the roasting kiln for secondary roasting. The roasting temperature is 500°C and the time is 100 minutes. The high temperature is fully decomposed, and the decyanation tailings are obtained after the material is cooled, which is transported to the material plant for storage.

[0065] The decyanation tailings are crushed to 4mm by a crusher, the particle size of the auxiliary components is 1mm, the decyanation tailings account for 50.0wt.% of the total weight of the raw materials, the auxiliary material...

Embodiment 3

[0071] Cyanide tailings (moisture content 20%) after pressure filtration and dehydration are dispersed by a disperser (incoming particle size is 30mm).

[0072] Transport the dispersed cyanide tailings material to the rotary kiln for primary roasting at a temperature of 800°C for 60 minutes and a negative pressure of -60kpa to remove part of the cyanide and all of the cyanide in the cyanide tailings moisture.

[0073] The cyanide tailings after the primary roasting are transported to the roasting kiln for secondary roasting. The roasting temperature is 800°C and the time is 180 minutes. The high temperature is fully decomposed, and the decyanation tailings are obtained after the material is cooled, which is transported to the material plant for storage.

[0074] The decyanation tailings are crushed to 4mm by a crusher, the particle size of the auxiliary components is 1mm, the decyanation tailings account for 55.0wt.% of the total weight of raw materials, the auxiliary raw mat...

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Abstract

The invention provides a method for harmlessly treating cyaniding tailings by using a microcrystalline glass aggregate surface crystallization process, which comprises the following steps: carrying out two-stage roasting decyanation on the cyaniding tailings subjected to filter pressing, proportioning the decyanated cyaniding tailings and auxiliary components according to a certain ratio, meltingthe batch at high temperature to obtain a glass liquid, after high-temperature molten glass is uniformly clarified, by a granulator, carrying out granulation, autonomously carrying out surface crystallization on the prepared glass particles in air to form microcrystalline glass particles of a 'ground curtain ' structure with crystal shells on the surfaces and amorphous cores inside, wherein heavymetal elements in the cyaniding tailings can serve as phase forming components in the crystal shells to form a new crystal phase, and solidifying the heavy metal elements in the amorphous core in a glass grid of the amorphous core. The microcrystalline glass particles can be used for preparing novel cementing materials for mine cemented filling and filling body aggregates. The method provided by the invention can realize heavy metal solidification of the cyaniding tailings and comprehensive utilization of the microcrystalline glass solidified body.

Description

technical field [0001] The invention relates to the technical field of hazardous waste disposal and comprehensive utilization, in particular to a method for harmlessly disposing of cyanide tailings by utilizing the crystallization process on the surface of glass-ceramic pellets. Background technique [0002] At the end of the 19th century, MacArthur proposed the method of using dilute cyanide solution to dissolve gold in gold ore and replace it with zinc metal to produce gold, and established the world's first cyanide gold extraction plant in Africa. Since then, cyanide gold extraction technology has been widely used in gold production in the world, and cyanide gold extraction technology has become the main method of modern gold mining. my country began to apply the cyanide method to gold extraction as early as the beginning of the 20th century. In 1901, a 2t / year cyanide test plant was built in Fanjiabu, Weihai, Shandong. Rapid promotion and rapid development. [0003] The...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C1/02C03C10/00C03B19/10
CPCC03C1/02C03C1/002C03C10/0063C03B19/1005Y02P10/20
Inventor 赵庆朝杨航李伟光朱阳戈
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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