Tank extraction technology is one of the two types of applications of bio-extraction technology. The speed of biological extraction is approximately 500,000 times faster than the natural oxidation of air and water in the absence of bacteria. The use of controlled conditions such as tanks equipped with stirrers and inflators can fully, quickly, and efficiently oxidize metal sulfides. For example, before using cyanide to extract gold, the use of 3-5 days of bio-extraction technology can increase gold recovery from 30% to 90%. The can extraction process involves continuously feeding the slurry to a primary reactor suspended in a bacterial container that is living in a slightly acidic environment. Most of the leaching occurs at this stage. With the continuous addition of pulp, partially oxidized pulp enters the second reactor and undergoes final oxidation. Leaching solution from the second reactor into the next container for solid-liquid separation. The solid-liquid separation was carried out using a counter-flow pour-and-wash washing cycle. The solution is either used to recover base metals or discharged in a non-polluting manner. Residues are treated or used to recover precious metals or as tailings. Can biological extraction has hitherto only been used to treat high levels of concentrates. The economic feasibility of tank oxidation depends on the following three factors: 1. The required reaction rate of metal recovery and the degree of sulfide oxidation determine the volume and quantity of the tank and the conditions of the agitator and ventilation, thus affecting the investment and operating costs; 2. Neutralization of reagents and solutions used for pH control affects operating costs; 3. The degree of salt content of mine water and the degree of requirements for acid-resistant items determine infrastructure investment.
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