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Plant arsenic-extraction pretreatment method for lowering smelting selection cost of high-arsenic gold ore

A pretreatment and gold mine technology, applied in the field of plant arsenic extraction pretreatment, can solve the problems of cyanidation leaching efficiency decline, influence of gold extraction efficiency, influence of gold recovery, etc., to achieve low investment and maintenance costs, low operating costs, The effect of beautifying the landscape

Inactive Publication Date: 2009-06-17
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, its gold extraction efficiency is greatly affected by associated minerals
Minerals such as arsenic and antimony are extremely harmful to the cyanidation of gold. When the arsenic content in gold ore is high, the cyanide extraction efficiency will be greatly reduced, which will affect the recovery of gold.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The average arsenic content of a refractory gold ore is 2%, and the gold content is 7.6g / t. Preliminarily crush the gold ore into a particle state of 2 The gold mine substrate, watered and irrigated by conventional methods, increases plant biomass by prolonging leaf life. After 5 months, the aboveground part was harvested for the first time, leaving 3 to 5 cm of stubble after harvesting. After analysis and determination, the arsenic content in the gold mine was reduced from 19923 mg / kg to 13274 mg / kg, which is equivalent to reducing the arsenic content in the gold mine by 33.37%. After harvesting every 4 months of growth, the arsenic content in the gold ore will continue to decrease. After 3 harvests, the arsenic content in the gold ore matrix will drop to 90mg / kg. recycling.

Embodiment 2

[0025]The gold grade of an arsenic-containing gold mine is 3.5g / t, and the average arsenic content is 1.1%. The gold ore is initially broken into a particle state of <1mm, and a gold ore matrix layer with a thickness of 20-30cm is tiled. Plant big-leaf wellhead edge grass at a distance of 15 cm. During the planting period, loosen and plow the substrate every half a month, and properly introduce animals such as earthworms to loosen the substrate. Increase the aeration and water permeability of the matrix, increase the oxidation-reduction potential of the matrix to promote the movement of arsenic into the solution, and accelerate the absorption and accumulation of arsenic by plants. At the same time, in the case of high oxidation-reduction potential, insoluble sulfides will become unstable and easy to Oxidation, so that the metal is released, is not only conducive to the uptake of arsenic by plants, but also the release of gold and subsequent leaching recovery. After 9 months of...

Embodiment 3

[0027] The average arsenic content of a refractory gold ore is 1.6%, and the gold grade is 16.3g / t. The gold ore is preliminarily broken into particle sizes smaller than 1mm, 3mm and 6mm, and the three particle sizes are combined in a ratio of 1:2:1, and then the gold ore matrix layer with a thickness of 30cm is flatly spread on the gold ore at an interval of about 20cm. Plant a centipede grass. Fertilize (same as example 1) every other month, water and irrigate according to conventional methods, and introduce microbial preparations to improve the amount of symbiotic fungi in the roots of centipede grass, which is conducive to the improvement of its rhizosphere environment and the absorption of elements such as arsenic accumulation. And after 5 months, its aerial part was harvested for the first time. Leave stubble of 3-5cm, and transplant the pre-cultivated and initially grown centipede grass to the gold ore substrate in the gap after harvesting, and continue to grow and ex...

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PUM

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Abstract

The present invention relates to botanic As extracting pre-treatment process resulting in lowered separating and smelting cost of high-As gold ore. The process includes planting ciliate desert grass onto arsenical gold ore substance to absorb As, and cutting ciliate desert grass growing to 40-60 cm height while leaving 3-5 cm height stubble for further growth. The process can lower the As content in gold ore to below 120 mg / kg, and has the advantages of great As absorbing amount and capacity of preventing soil and water loss and beautifying environment.

Description

1. Technical field [0001] The invention relates to a plant-extracting arsenic pretreatment method for reducing the dressing and smelting cost of refractory gold ore containing high arsenic. It is a method to remove and reduce the arsenic content of gold ore by means of plant extraction. 2. Background technology [0002] my country is rich in gold mineral resources, but a large part is refractory gold ore, which refers to the ore that cannot effectively leach most of the gold by conventional cyanidation after fine grinding. High-arsenic and high-sulfur refractory gold ore is a resource of strategic significance. Since it is difficult to recover by ordinary gold leaching techniques, it has not yet been developed and utilized in large areas. About 700 tons of gold reserves discovered in my country are refractory arsenic-containing sulfide gold ores. According to the general method, for every ton of gold extracted, 4,300 tons of arsenic and 200,000 tons of pyrite should be mine...

Claims

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Application Information

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IPC IPC(8): C22B3/00C22B1/14C22B11/00C22B30/04
CPCY02P10/20
Inventor 宁平王海娟曾向东张泽彪彭金辉王宏镔戴文娇范麦妮赵睿
Owner KUNMING UNIV OF SCI & TECH
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