In recent years, the pollution problem of used batteries at home and abroad increasingly concerned about the waste contains large quantities of heavy metals in the environment of the battery after the soil, and water is a serious threat to humanity itself. Due to less acid consumption, handling, low cost heavy metals leaching high operating temperature and pressure, etc., some researchers are trying to use bio-leaching technology, rechargeable laptop battery remove the battery from waste and recycling of toxic heavy metals, a more systematic study of China specialists, bio-leaching waste filtered in more nickel in nickel-cadmium batteries, cadmium, cobalt is feasible. batteries oxides and hydroxides of heavy metals exist mainly in the form, rather than the form of sulphides, batteries of bioleaching is required along with a large number of prototype materials, such as sulfur and ferrous ion, so that the bio-leaching mechanism may be related to ore, sludge, fly ash and soil leaching of sulphide mechanism is very different, but the batteries for the mechanism of bioleaching has been rarely reported.
Lithium-ion battery is currently the largest amount of secondary batteries, which contain cobalt in the market in recent years has reached 75 ~ 90 yuan / ton, the dissolution of cobalt and recycling of used lithium-ion batteries have been treated for topics, while cobalt bioleaching and release of solvents also recently been the concern of scholars home and abroad. published in “Science Bulletin No. 23 of 2008,” Lithium-ion battery scrap precious metals bioleaching mechanism of cobalt “The paper reported the lithium-ion battery scrap cobalt bio-leaching mechanism to reveal the impact type energy matrix cobalt leaching efficiency of underlying causes.
Bioleaching refers to the use of certain micro-organisms or their metabolic products of oxidation, reduction, complexation, adsorption, or dissolution, the solid-phase extraction of some of the insoluble components of a technology. In recent years, bioleaching technology goods in low-metal minerals, heavy metals remediation of contaminated soils, sewage sludge and hazardous fly ash removal of heavy metals detoxification and many other aspects to be studied in depth. Bio-leaching technology is currently the most widely used is the Thiobacillus ferrooxidans and Thiobacillus ferrooxidans, the primary mechanism is the use of these two types of acidophilic Thiobacillus bio-oxidation and low pH environment will result type intractable heavy metals that can be dissolved state. The research group has studied the bacterium Thiobacillus ferrooxidans and composition of mixed strains used lithium-ion batteries leaching.
In the ore, sludge, fly ash and soil solid phase, heavy metals, mainly in the form of sulfur is generally accepted that their leaching leaching mechanisms involving direct and indirect mechanisms. Thiobacillus acidophilus direct mechanism is through the cell and some Bennett direct sulfur oxidation enzyme system of mines in a soluble sulfate, dell latitude d610 battery,dell latitude d620 battery indirect mechanism is mainly the use of Thiobacillus ferrooxidans metabolites - the high sulfuric acid for iron-oxidizing sulfides metal sulfates.
The results show that strains mixed cobalt leaching efficiency above 90%, but also with a mixture of sulfur and pyrite in the matrix of energy, cobalt leaching efficiency than a single atom sulfur pyrite or only where a substantial increase in the energy matrix. also showed that lithium-ion fragments of the dissolution of cobalt is entirely attributed to the indirect mechanism of bioleaching has no direct mechanism.