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A method for comprehensive utilization of cyanide tailings cleaning transformation

A cyanide tailings and cleaning technology, applied in the direction of solid waste removal, etc., can solve the problems of unrecyclable, cyanide tailings pollution of the environment, etc., achieve good cyanide removal effect, solve backlog and secondary pollution , The effect of not polluting the environment

Inactive Publication Date: 2017-05-10
FUJIAN SHUANGQISHAN MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Improper treatment of these cyanide tailings will pollute the environment, but it contains some valuable elements such as sulfur, iron, etc. and cannot be recycled

Method used

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  • A method for comprehensive utilization of cyanide tailings cleaning transformation

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Comparison scheme
Effect test

Embodiment 1

[0037] A method for cleaning, transforming and comprehensively utilizing cyanide tailings, comprising the following steps:

[0038] 1) Using autoclaved method to hydrolyze cyanide in cyanide tailings

[0039] After the cyanide tailings are press-filtered, install them in a bucket truck, then put the bucket truck into the autoclave, vacuumize it for 0.4 hours after sealing, and then introduce steam. After the temperature rises to 170°C, start to hold the pressure for 4 hours , and then reduce the pressure to discharge ammonia-containing steam water, and the remaining secondary resource cyanide tailings in the autoclave;

[0040] 2) Add sodium dihydrogen phosphate and magnesium chloride to the ammonia-containing steam water obtained in 1), so that NH4 + , Mg 2+ and PO4 -3 The molar ratio is n(NH4 + ): n (Mg 2+ ): n(PO4 -3 )=1:1.1:1, adjust the pH to 8.5, use magnesium ammonium phosphate precipitation method to process the steam water containing ammonia nitrogen, then preci...

Embodiment 2

[0044] A method for cleaning, transforming and comprehensively utilizing cyanide tailings, comprising the following steps:

[0045] 1) Using autoclaved method to hydrolyze cyanide in cyanide tailings

[0046] After the cyanide tailings are press-filtered, install them in a bucket truck, then put the bucket truck into the autoclave, seal it and vacuumize it for 0.5 hours, then put in steam, and after the temperature rises to 190°C, start to hold the pressure for 2 hours , and then reduce the pressure to discharge ammonia-containing steam water, and the remaining secondary resource cyanide tailings in the autoclave;

[0047] 2) Add sodium dihydrogen phosphate and magnesium chloride to the ammonia-containing steam water obtained in 1), so that NH4 + , Mg 2+ and PO4 -3 The molar ratio is n(NH4 + ): n (Mg 2+ ): n(PO4 -3 )=1:1.1:1, adjust the pH to be 9, use magnesium ammonium phosphate precipitation method to process the steam water containing ammonia nitrogen, then precipita...

Embodiment 3

[0051] A method for cleaning, transforming and comprehensively utilizing cyanide tailings, comprising the following steps:

[0052] 1) Using autoclaved method to hydrolyze cyanide in cyanide tailings

[0053] Press-filter the cyanidation tailings and install them with a truck, then put the truck into the autoclave, seal it and vacuumize it for 1 hour, then introduce steam, and after the temperature rises to 200°C, start to hold the pressure for 1.5 hours , and then reduce the pressure to discharge ammonia-containing steam water, and the remaining secondary resource cyanide tailings in the autoclave;

[0054] 2) Add sodium dihydrogen phosphate and magnesium chloride to the ammonia-containing steam water obtained in 1), so that NH4 + , Mg 2+ and PO4 -3 The molar ratio is n(NH4 + ): n (Mg 2+ ): n(PO4 -3 )=1:1.1:1, adjust the pH to 9.5, use the magnesium ammonium phosphate precipitation method to treat the steam water containing ammonia nitrogen, then precipitate and filter ...

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Abstract

The invention discloses a clean conversion and comprehensive utilization method for cyanided tailings. The method comprises the following steps: hydrolyzing cyanides in the cyanided tailings with a high-pressure steaming method, closing an autoclave, vacuumizing for 0.4-1h, introducing steam, keeping the pressure for 1.5-4h after the temperature is raised to 170-200 DEG C, then reducing the pressure, discharging ammonia containing steam water, wherein secondary resource-cyanided tailings are remained in the autoclave; treating the ammonia nitrogen containing steam water with a magnesium ammonium phosphate precipitation method; and finally, carrying out flotation on the secondary resource-cyanided tailings to obtain sulfur concentrate with more than 48% of sulfur. The method has a good cyanogen removal effect and can achieve the one-time cyanogen removal rate up to more than 99.5%, and high-quality sulfur concentrate with more than 48% of sulfur and more than 5g / t of alloy can be obtained through floatation; and besides, the method is simple and convenient, can achieve clean production, and has cyanided tailing treatment cost of not higher than 80 yuan per ton.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of metallurgical waste slag, and in particular relates to a method for clean transformation and comprehensive utilization of cyanidation tailing slag. Background technique [0002] The cyanidation gold extraction process has the advantages of high gold recovery rate, strong adaptability to ore, simple process operation, and low cost. Among the many methods and processes of gold smelting, the cyanide leaching gold extraction process has always been irreplaceable. . [0003] Since its application in 1887, it has been widely used all over the world. By 2005, more than 80% of the world's new gold smelters still use the cyanide gold extraction process. [0004] But the cyanide used in the cyanidation gold leaching process has daunting toxicity. [0005] The cyanidation gold leaching process will produce a large amount of cyanide tailings. [0006] Cyanide tailings contain a large amount...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B5/00B09B3/00
Inventor 肖坤明郑新烟谢文清
Owner FUJIAN SHUANGQISHAN MINING
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