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A kind of bioselective leaching method of low-grade copper-cobalt ore

A low-grade and selective technology, applied in the field of microbial metallurgy, can solve the problems of loss of cobalt, difficult enrichment and recovery of cobalt, lack of cobalt recovery system, etc., and achieve the effect of short process flow, efficient recovery and simple equipment

Active Publication Date: 2015-11-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some cobalt-bearing sulfide ores use the traditional sulfur concentrate roasting to produce acid-slag leaching cobalt extraction process. For example, Qinghai Delni Copper-Cobalt Mine adopts the flotation-sulfur concentrate acidification roasting process to extract cobalt. Sulfuric acid is useless in this process. And air sulfur dioxide pollution is quite serious. More importantly, the direction of cobalt in the smelting process is complicated, and it is dispersed in each unit operation of the entire process, and the cobalt dispersed in matte copper and converter slag is difficult to enrich and recover, resulting in the loss of cobalt , the actual cobalt recovery rate is low (so far not more than 75%), and there are great defects in the process
There are also copper and cobalt mines that only have a copper recovery system, but lack a cobalt recovery system

Method used

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  • A kind of bioselective leaching method of low-grade copper-cobalt ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] (1) The low-grade copper-cobalt ore is crushed and ground to a particle size of ≤74 μm, accounting for 50% of the total flotation concentrate; the copper-cobalt ore contains 0.05% cobalt and 10.00% copper, wherein Copper exists in the form of chalcopyrite and cobalt in the form of cobaltite.

[0021] (2) Inoculate the mixed bacterial liquid containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiothiooxidans into 9K culture medium in an oxidation tank with stirring device, The amount of inoculum is based on the volume ratio of seed: medium = 1:10, inflated with air and stirred, the amount of air inflated is 0.1m 3 / h, the stirring rate is 600 rpm, the culture temperature is 44°C, the pH value of the culture solution is 1.0, and the culture time is 24 hours.

[0022] (3) Add copper-cobalt ore to the bacterial culture solution so that the mass concentration of ore powder is 25%, inflate with air and stir, the amount of air inflated ...

Embodiment 2

[0027] (1) The copper-cobalt ore is crushed and ground to a particle size of ≤74 μm, accounting for 65.4% of the total flotation concentrate; the copper-cobalt ore contains 2% cobalt and 18.00% copper, of which copper is It exists in the form of chalcopyrite, and cobalt exists in the form of chalcopyrite.

[0028] (2) Inoculate the mixed bacterial liquid containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiothiooxidans into 9K culture medium in an oxidation tank with stirring device, The volume ratio of the inoculum is: strain: culture medium = 1:15, fill with air and stir, the volume of air is 0.2m 3 / h, the stirring rate is 1000 rpm, the culture temperature is 52°C, the pH value of the culture solution is 1.5, and the culture time is 24 hours.

[0029] (3) Add copper-cobalt ore to the bacterial culture solution so that the mass concentration of the ore powder is 20%, inflate with air and stir, the amount of air inflated is 0.2m 3 / ...

Embodiment 3

[0034] (1) Crushing and grinding the copper-cobalt ore to a particle size of ≤74 μm accounts for 78% of the total flotation concentrate; the copper-cobalt ore contains 1.05% cobalt mass fraction and 25% copper mass fraction, of which copper is It exists in the form of chalcopyrite, and cobalt exists in the form of arsenite.

[0035] (2) Inoculate the mixed bacterial liquid containing Microspiral ferrooxidans, Thiobacillus ferrooxidans and Thiobacillus acidophilus thiothiooxidans into 9K culture medium in an oxidation tank with stirring device, The volume ratio of the inoculum is: strain: culture medium = 1:20, fill with air and stir, the volume of air 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 24 hours.

[0036] (3) Add copper-cobalt ore to the bacterial culture solution so that the mass concentration of the ore powder is 18%, inflate with air and stir, the amount of air in...

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Abstract

The invention discloses a biological selectivity leaching method of low-grade copper-cobalt ore, and belongs to the field of microbial metallurgy. The biological selectivity leaching method comprises the following steps: the copper-cobalt ore is crushed and grinded; a mixed bacterium liquid containing ferrous oxide micro spirilla, acidophilic thiobacillus ferrooxidans and acidophilic thiobacillus thiooxidans is introduced to a 9 K of culture medium for cultivating to obtain a bacterium culture solution. The copper-cobalt ore is added to the bacterium culture solution to conduct bacterium leaching on the cobalt concentrate; when the leaching rate of cobalt in the bacterium leaching liquid reaches above 97%, the leaching liquid containing valuable metal ions such as cobalt and copper is separated from the leaching residue; then Lix984N extraction agent is adopted to extract copper to obtain a copper product; the raffinate from which the copper is extracted is subjected to precipitation and iron removing treatment by a jarosite process to obtain an iron product; cobalt-containing liquid after being subjected to iron removal is crystallized to obtain a cobalt oxalate product. The biological selectivity leaching method has the advantages of short technique flow, easy operation, simple equipment, low energy consumption, no high-temperature smelting, no emission of pollutant smoke and poisonous gas, and quick achievement of separation and efficient recovery of cobalt and other valuable metals.

Description

technical field [0001] The invention belongs to the field of microbial metallurgy, in particular to a bioselective leaching method of low-grade copper-cobalt ore. Background technique [0002] Cobalt is an important strategic rare metal with excellent physical, chemical and mechanical properties. It is an important material for the manufacture of high-strength alloys, high-temperature resistant alloys, hard alloys, magnetic materials and catalysts. By 2008, the world's cobalt consumption will reach 8700t, and the world's cobalt consumption will be about 8000~10000t in the next few years. At present, the annual consumption of cobalt powder in my country is 2500~2800t, and its consumption fields are mainly in industries such as special steel, hard alloy, diamond tools and petrochemical catalysts. [0003] The world's cobalt reserves are 4 million tons, and resources are 8.8 million tons. Most of the cobalt resources are distributed in cobalt-bearing laterite nickel deposits, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/18C22B23/00C22B15/00
CPCY02P10/20
Inventor 杨洪英佟琳琳刘伟骆新耿刘媛媛朱景和
Owner NORTHEASTERN UNIV LIAONING
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