Biological selectivity leaching method of low-grade copper-cobalt ore

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, and particularly relates to a method for bioselective leaching 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 manufacturing high-strength alloys, high-temperature 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 areas are mainly special steel, cemented carbide, diamond tools and petrochemical catalysts. [0003] The world's cobalt reserves are 4 million tons and the resources are 8.8 million tons. Most of the cobalt resources are distributed in cobalt-bearing laterite-type nickel deposits, and most of the ...

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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

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