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
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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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