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Plant arsenic-removing pretreatment method for recycling golden from high-arsenic golden mine tailing

A technology for gold tailings and pretreatment, applied in the direction of improving process efficiency, can solve problems such as large equipment investment, complex production process, environmental pollution, etc., and achieve large bioconcentration coefficient, high absorption and enrichment, and arsenic migration. high total effect

Inactive Publication Date: 2009-07-29
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these methods have complex production processes and large investment in equipment. During the roasting process, low-toxic arsenopyrite, orpiment, realgar and other arsenic-containing minerals will be oxidized into highly toxic arsenic, arsenate and sulfur dioxide, causing environmental pollution.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] The arsenic content of a high-arsenic gold tailing is 1%, and the gold content is 0.3g / t. Take the high-arsenic gold tailings out of the tailings dam, lay them flat with a thickness of 40-50cm, and after deep plowing and drying for 4-8 days, plant a centipede grass every 20cm on the tailings sand, and water and irrigate as needed . Auxiliary watering foliage fertilizer, its main component is a liquid fertilizer composed of ammonium nitrate and ammonium dihydrogen phosphate mixed with water, which promotes its survival, strengthens photosynthesis, and can increase plant biomass by prolonging the life of leaves. At the same time, dilute citric acid and dilute malic acid solutions were poured into the gold tailings. After 4 months, the aboveground part is harvested for the first time, and the stubble should be 2 to 5 cm. After analysis and determination, the arsenic content in the tailings was reduced from 10086 mg / kg to 6740 mg / kg, which is equivalent to reducing the ar...

Embodiment 2

[0022] The gold grade of a certain high-arsenic gold tailings is 0.6g / t, and the average arsenic content is 0.7%. The high-arsenic gold tailings are taken out from the tailings dam, laid flat with a thickness of 50-60cm, and deep plowed once a day. After 5 days, On the tailings sand with 60 plants / m 2 Plant centipede grass at left and right intervals, introduce earthworms every half a month during the planting period to loosen the substrate, and water and irrigate as needed. After 6 months of planting, the aboveground part should be harvested, and the harvest should leave 2 to 5 cm of stubble. The arsenic content in high-arsenic gold tailings was reduced from 7562mg / kg to 1036mg / kg.

Embodiment 3

[0024] The average arsenic content of a high-arsenic gold tailing is 2.6%, and the gold grade is 0.8g / t. Take the high-arsenic gold tailings out of the tailings dam, crush the compacted tailings sand into particle sizes of 0.05-0.5mm, 1-1.5mm and 2-2.5mm, and the three particle sizes are mixed in a ratio of 1:1:1 After the combination of proportions, lay 40cm flat, deeply plow 2 times a day, and plant a big-leaf wellhead edge grass every 30cm on the gold tailing sand after 3 days. After germination, 0.1 mmol / L disodium edetate (EDTA), dilute tartaric acid, dilute citric acid, dilute humic acid and / or dilute malic acid were evenly sprayed every other month into the gold ore matrix. Water and irrigate on demand. After 4 months, the above-ground parts were harvested for the first time. After harvesting, the pre-cultivated big-leaf wellhead edge grass is transplanted to continue growing and extracting arsenic. After growing for 4 months and then harvesting, the arsenic content ...

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Abstract

The invention relates to a vegetable dearsenifying preprocess method for recycling gold in arsenic-rich gold milltailings. By planting ciliate desert-grass or Pteris cretica, arsenic in the gold milltailings is absorbed by roots due to super accumulation characteristic to arsenic, calciphilous, alkaline-resisting characteristic with large biomass, short growth period and cyanogens ion destroying characteristic. The arsenic is transferred upward to overground part and removed from the arsenic-rich gold milltailling by cutting the overground part, thus finishing arsenic extraction preprocess of secondary use of the gold milltailings .

Description

1. Technical field [0001] The invention relates to a plant arsenic removal pretreatment method for recovering gold from high-arsenic gold tailings. It is a kind of planting centipede grass or big-leaf wellhead edge grass, using its super-accumulation characteristics of arsenic, relying on its root system to absorb and enrich arsenic in a large amount in gold mines, and transport and transfer the arsenic upward to the aboveground, and then through harvesting The aboveground part removes the arsenic in the gold tailings, and completes the arsenic extraction pretreatment method for the secondary utilization of the gold tailings. 2. Background technology [0002] Gold tailings are the main solid waste of gold concentrators, and my country's gold tailings resources are very rich. In the gold mines built before the 1970s, most of the concentrators used traditional production processes such as flotation, gravity separation, amalgamation-mercury separation or gravity separation-flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/00C22B11/00C22B30/04
CPCY02P10/20
Inventor 王海娟宁平张泽彪曾向东王宏镔
Owner KUNMING UNIV OF SCI & TECH
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