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Method for extracting gold from cyanidation tailings

A technology of cyaniding tailings and calcium chloride, which is applied in the field of mineral processing and metallurgy, can solve the problems of low gold recovery rate, achieve high gold recovery rate, improve resource utilization rate, and high pellet strength

Inactive Publication Date: 2015-06-24
ZHAOJIN MINING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the oxidation leaching process, the gold recovery rate is low, and other metal elements cannot be removed

Method used

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  • Method for extracting gold from cyanidation tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] (1) Get 10kg of cyanide tailings, 200g of bentonite, and 100g of calcium chloride and add them to the mixer to form a mixture, and then moisten and grind the mixture so that the fineness of the mixture—200 mesh particle size accounts for more than 80% of the mass ratio ;

[0038] (2) sending the mixed material after moistening into a disc granulator with a diameter of 5 cm to granulate, spraying the calcium chloride solution obtained in 1.2L step (7) during the granulation process;

[0039] (3) The prepared pellets are sent to the grate machine for drying. The grate machine is divided into five drying sections. At 220°C, dry the pellets until the water content is less than 0.5wt%;

[0040] (4) The dried pellets enter the rotary kiln through the grate chute for roasting. In the rotary kiln, the fine coal powder sprayed from the coal injection pipe of the kiln head provides heat to control the temperature at 1050°C, and the roasting is completed for 4 hours to obtain hot...

Embodiment 2

[0046] (1) Get 10kg of cyanide tailings, 200g of bentonite, and 500g of calcium chloride and add them to the mixer to form a mixture, and then moisten and grind the mixture so that the fineness of the mixture—200 mesh particle size accounts for more than 80% of the mass ratio ;

[0047] (2) sending the mixed material after moistening into a disc granulator with a diameter of 5 cm to granulate, spraying the calcium chloride solution gained in the step (7) of 1.5L during the granulation process;

[0048] (3) The prepared pellets are sent to the grate machine for drying. The grate machine is divided into five drying sections. At 235°C, dry the pellets until the water content is less than 0.5wt%;

[0049] (4) The dried pellets enter the rotary kiln through the grate chute for roasting. In the rotary kiln, the fine coal powder sprayed from the coal injection pipe of the kiln head provides heat to control the temperature at 1150°C, and the roasting is completed for 4 hours to obtain ...

Embodiment 3

[0055] (1) Get 10kg of cyanide tailings, 200g of bentonite, and 1000g of calcium chloride and add them to the mixer to form a mixture, and then grind the mixture so that the fineness of the mixture -200 mesh particle size accounts for more than 80% of the mass ratio ;

[0056] (2) sending the mixed material after moistening and grinding into a disc granulator with a diameter of 5 cm to granulate, and spray the calcium chloride solution obtained in the step (7) of 1L in the granulation process;

[0057] (3) The prepared pellets are sent to the grate machine for drying. The grate machine is divided into five sections of drying area. At 250°C, dry the pellets until the water content is less than 0.5wt%;

[0058] (4) The dried pellets go through the grate chute into the rotary kiln for roasting. In the rotary kiln, the heat is provided by the fine coal powder sprayed from the coal injection pipe of the kiln head to control the temperature at 1200°C, and the roasting is completed ...

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Abstract

The invention belongs to the technical field of metallurgy, and particularly relates to a method for extracting gold from cyanidation tailings. The method comprises the following steps that the cyanidation tailings, bentonite and calcium chloride are proportionally mixed, pelletized, dried and roasted; metal gold and chlorine form a chemical compound; the chemical compound is volatilized in a form of smoke; the smoke is subjected to spray washing and concentrated by a thickener; ore pulp is subjected to filter pressing; an obtained filter cake is cyanidation leaching; and the gold is extracted. The method is simple in process, low in raw material requirement and high in gold recovery rate; the pellet strength is high; the phenomenon of rotary kiln accretion is avoided; the gold in the cyanidation tailings is recovered with lower production cost; in addition, 'zero waste emission' is realized in a whole production flow; environmental pollution is reduced; and a resource utilization rate is increased.

Description

technical field [0001] The invention belongs to the field of beneficiation and metallurgy, in particular to a method for extracting gold from cyanidation tailings by a chlorination roasting method. Background technique [0002] With the development of the gold industry, domestic easy-to-handle gold concentrates have basically been processed, and arsenic-containing gold concentrates have become the main raw materials for gold production. For simple gold concentrate, the cyanide leaching method has the advantages of high recovery rate and low cost. However, for complex gold concentrates, the gold and silver contents in the cyanidation tailings are still relatively high. According to incomplete statistics, as of 2010, the domestic gold system cyanide tailings discharge has reached more than 24.5 million tons. [0003] Common treatment schemes for cyanidation tailings include "pre-oxidation-cyanidation", "pressurized oxidation-cyanidation", "bacterial oxidation", "chlorination...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B11/00
CPCY02P10/20
Inventor 李秀臣秦洪训王云王立新刘洪晓王彩霞沈述保常耀超孙留根桑胜华孙英翔王维振孙振
Owner ZHAOJIN MINING
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