Bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores

A bacterial oxidation and pretreatment technology, which is applied in the direction of improving process efficiency, can solve the problems of poor gold extraction effect, and achieve significant economic benefits, less investment, and obvious economic benefits

Active Publication Date: 2010-08-04
NORTHEASTERN UNIV
View PDF2 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Affected by the geochemical properties of elements, Au and As are closely symbiotic, and a variety of arsenic-containing minerals often coexist in gold mines, such as arsenopyrite, realgar, orpiment, etc. Gold mines containing arsenopyrite and realgar are widely distributed. , the effect of gold extraction by bacterial oxidation method at home and abroad is not good

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores
  • Bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores
  • Bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] The results of multi-element analysis of the ore samples are shown in Table 3. The direct cyanide leaching rate of the ore is 32.1%.

[0037] Table 3 Example 1 ore sample multi-element analysis results

[0038]

[0039] Bacterial oxidation pretreatment - cyanide gold extraction method is as follows:

[0040] The mixed bacterial solution containing CCTCC NO: M209074 and CCTCC NO: M207215 was inoculated into 9K medium (see Table 1 for ingredients) in an oxidation tank with a stirring device for cultivation, and the inoculum volume ratio was: bacteria Seed: culture medium = 1:15, inflate with air and stir, aeration volume 0.2m 3 / h, the stirring rate is 1000 rpm, the culture temperature is 45°C, the pH value of the culture solution is 1.6, and the culture time is 18 hours.

[0041] Add the ore powder to the bacterial culture solution so that the mass concentration of the ore powder is 15%, inflate with air and stir, the amount of air inflated is 0.2m 3 / h, the stirri...

Embodiment 2

[0045] The results of multi-element analysis of ore samples are shown in Table 4. The direct cyanide leaching rate of the ore is 18.2%.

[0046] Table 4 Example 2 ore sample multi-element analysis results

[0047]

[0048] Bacterial oxidation pretreatment - cyanide gold extraction method is as follows:

[0049] The mixed bacterial solution containing CCTCC NO: M209074 and CCTCC NO: M207215 was inoculated into 9K medium (see Table 1 for ingredients) in an oxidation tank with a stirring device for cultivation, and the inoculum volume ratio was: bacteria Seed: culture medium = 1:20, inflate with air and stir, the amount of aeration is 0.3m 3 / h, the stirring rate is 1400 rpm, the culture temperature is 60°C, the pH value of the culture solution is 2.0, and the culture time is 12 hours.

[0050] Add the ore powder to the bacterial culture solution so that the mass concentration of the ore powder is 25%, inflate with air and stir, the amount of air inflated is 0.3m 3 / h, the st...

Embodiment 3

[0054] The results of multi-element analysis of ore samples are shown in Table 5. The direct cyanide leaching rate of the ore is 42.8%.

[0055] Table 5 Example 3 ore sample multi-element analysis results

[0056]

[0057] Bacterial oxidation pretreatment - cyanide gold extraction method is as follows:

[0058] The mixed bacterial solution containing CCTCC NO: M209074 and CCTCC NO: M207215 was inoculated into 9K medium (see Table 1 for ingredients) in an oxidation tank with a stirring device for cultivation, and the inoculum volume ratio was: bacteria Seed: culture medium = 1:10, inflate with air and stir, the amount of air inflated is 0.1m 3 / h, the stirring rate is 600 rpm, the culture temperature is 50°C, the pH value of the culture solution is 1.5, and the culture time is 24 hours.

[0059] Add the ore powder to the bacterial culture solution so that the mass concentration of the ore powder is 10%, inflate with air and stir, the amount of air inflated is 0.1m 3 / h, t...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention relates to a bacterial oxidation pretreatment and cyanidation gold extraction method of arsenopyrite and realgar type refractory gold ores, comprising the following steps of: inoculating a mixed bacterial solution containing CCTCC NO: M209074 and CCTCC NO: M207215 to a 9K culture medium for culturing; adding ore powder to a bacterial culture solution; carrying out bacterial oxidation pretreatment at the temperature of 44-60 DEG C, wherein pH is 0.8-2.5; charging air and stirring for 4-8 days, wherein the aeration rate is 0.1-0.3m3/h and the stirring rate is 600-1400 turns/min; adding water to bacterial oxidation slag and blending into a slag slurry; regulating the pH value of the slag slurry to 9.0-12; then adding sodium cyanide, wherein the pH value in the cyanidation process is 9.0-12, and the cyanidation time is 24-48 hours. The leaching rate of gold is greatly increased and can reach by more than 94 percent after cyanidation leaching is carried out on the bacterial oxidation treated bacterial oxidation slag, and the economic benefit is extremely remarkable.

Description

technical field [0001] The invention belongs to the technical field of biometallurgy, and in particular relates to a method for bacterial oxidation pretreatment of arsenopyrite-realgar type refractory gold ore-cyanidation gold extraction. Background technique [0002] Gold mine is an important non-renewable mineral resource. With the deepening of mining, the reserves of easy-to-leach gold mines are reduced, and the refractory gold mines have attracted widespread attention. Refractory gold ore means that the ore is leached directly after grinding, and the leaching rate of gold is low or very low. Generally, the leaching rate is 80% as the limit, and those lower than this are collectively referred to as refractory gold ore. Some ores are extremely difficult to leach, and the direct leaching rate of such ores is only 10% to 30%. Arsenic-containing gold ore is an important type of refractory gold ore. In order to improve the utilization rate, this kind of ore must be pretreate...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/18C22B11/08
CPCY02P10/20
Inventor 杨洪英崔日成佟琳琳
Owner NORTHEASTERN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap