空气氧化法生产焦锑酸钠的氧化后液中砷和锑的脱除

研究了空气氧化法生产焦锑酸钠的氧化后液中脱除砷和锑的方法,并探讨了提高副产品硫代硫酸钠产量的途径.研究结果表明:采用硫酸和SO2中和脱除砷和锑,终点pH值分别控制在6.0和7.0,砷的脱除率分别为26.9%和19.3%,锑的脱除率分别为94.5%和93.5%;而采用硫酸亚铁、水合肼和硫化钠3种试剂脱除砷和锑,过量系数分别为1.0,2.0和1.0时砷的脱除率分别为70.0%,50.0%和60.0%,锑的脱除率分别为96.7%,95.6%和96.7%;在加硫磺反应中,当过量系数为1.1和时间为90 min时,硫向硫代硫酸钠的转化率能达到83.3%.

Removal of arsenic and antimony from oxidated solution of sodium thioantimonite production by air oxidation

The removal of arsenic and antimony from the oxidated solution was investigated in the sodium thioantimonite production by air oxidation, and the approach of enhancing the by-product output of sodium thiosulfate was explored. The results show that when sulphuric acid and SO2 gas are separately used to neutralize the oxidation solution, as the ending pH is controlled at 6.0 and 7.0, respectively,the removal ratio of arsenic is 26.9% and 19.3%; the removal ratio of antimony is 94.5% and 93.5 %, respectively. When FeSO4, N2H4 and Na2S with the excessive coefficient of 1.0,2.0,1.0 respectively are used to remove arsenic and antimony, the removal ratio of arsenic are 70.0% ,50.0% and 60.0%, separately; the removal of antimony can reach 96.7%, 95.6% and 96.7%, respectively. The transform ratio of sulfur can reach 83.3% when the sulphuric excessive coefficient is 1.1 and the time is 90min.