过氧化物促进作用的研究和探讨

An Approach to the Accelerating Effect of Peroxide

探讨了H2O2和CaO2在去离子水、矿浆和氰化浸出液中的稳定性和去毒作用．通过对H2O和CaO2放氧速度的测定，得出；H2O2在弱碱性条件下的稳定性较好；在强碱性条件下，CaO2的稳定性较好；在矿浆和氰化浸出液中，H2O2能迅速分解而放氧，而CaO2却以相对较为缓慢的速度放氧．通过测定溶液和矿浆中的游离CN－，得出：在溶液中H2O2和CaO2的去毒作用随pH值的增大而减小；在矿浆中只要控制过氧化物的适宜用量，不但不会引起去毒作用，反而会节省大量氰化物．以此为依据，对全泥氰化和金精矿氰化的两个典型矿石进行了试验，表明利用H2O2或CaO2助浸均可提高浸出速度，缩短浸出时间．通过试验和理论分析证明，浸出速度得以提高的原因是溶解氧和过氧化物本身作为氧化剂都参与了浸金反应．本文最后对过氧化物促浸法进行了评价，并提出了应用前景．

The stability and detoxification of hydrogen peroxide and calcium peroxide in pure water, pulp and cyanide leach solution is discussed. By measuring oxygen liberating rate of hydrogen peroxide and calcium peroxide, it is concluded that hydrogen peroxide has good stability in weak alkaline medium and calcium peroxbide has good stability in strong alkaline medium. In pulp and cyanide leach solution, hydrogen peroxide can be discomposed to release oxygen quickly, but calcium peroxide can be discomposed to release oxygen slowly, By measuring the free CN in solution or pulp, it is concluded that the detoxification of hydrogen peroxide and calcium peroxide is weakened with the increase of the pH value of the solution. In pulp, when the amount of peroxide is suitable, d etoxification is not caused, but the cyanide consumption can be reduced greatly. According to the above theory, two pieces of typical ore from ore and gold concentration cyanidation stage are tested, it is shown that the leaching time can be shortened and the leaching rate can be improved by hydrogen peroxide and calcium peroxide assistant leaching. By experiment and theoretical analysis, it is proved that both the dissolved oxygen and peroxide itself, as oxidants, take the part in the gold leaching reaction. At last, the peroxide assistant leaching method is evaluated and the future application is proposed.