Experimental Study On Copper Sulfide Leaching By Thiobacillus Ferrooxidans

Copper has a wide range of uses.With the development of society,the market demand has gradually expanded.my country's copper mine resources are very limited.The grade of copper mines has dropped from a few percent in the early 20th century to a few thousandths of today,and traditional processes have been unable to effectively recycle low-grade ores.Compared with traditional mining and smelting technology,biohydrometallurgy has the advantage of being able to process copper ore with low grade and poor selectivity.Further research on the biological leaching of copper sulfide ore can have certain guiding significance for the production of copper industry.In this thesis,Thiobacillus ferrooxidans was isolated from the pit water of the mining area,and the bacteria were enriched,cultured and identified.The optimal growth conditions of Thiobacillus ferrooxidans were studied.The optimal growth condition of Thiobacillus ferrooxidans on liquid medium is 2.0.The temperature is 30?,the initial Fe²⁺concentration is 9g/L,and the inoculation amount is 10%.The best conditions for the growth of Thiobacillus ferrooxidans on the solid medium:the temperature is 30?and the pH is 2.5.Biological leaching of chalcopyrite,chalcopyrite and chalcopyrite under the conditions of slurry concentration of 1%,3%and 8%showed that:chalcopyrite,chalcopyrite and chalcocite with a slurry concentration of 1%The leaching rates of copper ore bioleaching were 31.3%,94.7%and 97.2%respectively;the leaching rates of minerals with a slurry concentration of 3%were 28.4%,91.3%and 93.2%;the leaching of minerals with a slurry concentration of 8%The rates were 25.5%,87.6%,and 89.3%,respectively;indicating that the maximum leaching rate of the same minerals gradually decreased with the increase of slurry concentration.Using MS software to simulate the crystal structure of the three copper sulfide ores,calculate the bond length.The results show that the total bond energies of chalcopyrite,Bornite,and chalcopyrite are 802.608eV,536.86eV,and 390.32eV,respectively,and the total bond energy decreases in turn.The geological genesis and occurrence analysis of chalcopyrite,chalcopyrite and porphyrite,combined with the analysis of the difference in crystal structure of copper sulfide minerals,was analyzed under the same leaching conditions.The effect of copper ore leaching rate,and analysis of the causes.The results show that the ore-forming areas are the same,and the different genesis and occurrences among different minerals also make the crystal structure and composition of the minerals different.The difference in crystal structure and composition will lead to differences in their physical and chemical properties,and then lead to differences in leaching behavior;Crystals are atoms bonded together by bonds,and bond length is a factor that affects crystal stability.The crystal structure of copper sulfide minerals is different,and the crystal structure parameters are also different.The crystal structure is the key factor that determines the difference in the bacterial leaching efficiency of different copper sulfide minerals.The speed of theoretical analysis of mineral leaching is consistent with the experimental results.