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本文报道了对苯二酚生产过程中废锰催化剂内所含主要元素锰、钴、镍、铁的硫酸浸取行为。认为锰的浸取反应原理由硫酸与二氧化锰的氧化还原反应,及铁、氧化亚铁与硫酸反应所生成的硫酸亚铁与二氧化锰的氧化还原反应组成。实验中选择了不同的搅拌转速、液固比、浸取剂硫酸的浓度、温度等操作条件,考察了锰、铁、镍、钴的浸取情况,其中温度的影响最显著。在浸取温度为80℃,浸取剂硫酸浓度为2.8mol/L,液固比为6.6:1,搅拌转速为250rpm,浸取反应时间为3.5h的条件下,锰的浸出率几乎达到100％,铁的浸出率为75％。镍,钴在所有的实验条件下,浸出率均接近100％。
This paper reports the sulfuric acid leaching behavior of manganese, cobalt, nickel and iron contained in spent manganese catalyst in hydroquinone production process. It is considered that the principle of manganese leaching reaction consists of the redox reaction of sulfuric acid and manganese dioxide and the redox reaction of ferrous sulfate and manganese dioxide generated by the reaction of iron, ferrous oxide and sulfuric acid. In this experiment, different operating conditions such as stirring speed, liquid-solid ratio, concentration of sulfuric acid and temperature were chosen to study the leaching conditions of manganese, iron, nickel and cobalt, of which temperature had the most significant effect. Under the conditions of leaching temperature of 80 ℃, leaching agent concentration of sulfuric acid of 2.8mol / L, liquid-solid ratio of 6.6: 1, stirring speed of 250rpm and leaching reaction time of 3.5h, the leaching rate of manganese reached almost 100 %, Iron leaching rate of 75%. Nickel, cobalt in all the experimental conditions, the leaching rates are close to 100%.