By stirring the
mixture of
slag of arsenic and soda in smelting
antimony at 80 ℃ for (about) 2 h, the mixture was filtered so as to remove the antimony. Then the liquid after
removing antimony was blown by CO_2 in order to remove the
carbonic salt. The pH value of the mixture after removing the carbonic salt was adjusted and the appropriate Na_2S was added to the mixture in order to remove the
Arsenic. The commercial scale test was conducted for anti-pollution treating. The results indicate that the recovery rate of antimony and lead is 99.0% and 99.6%, respectively. The leach rate of arsenic,
Soda and sodium sulfate is 90%,99% and 100%, respectively. The content of soda in carbonic salt reaches 95% and the content of arsenic is about 1%; the content of arsenic in arsenide sulfur reaches 37%. Sodium hydroxide is used to absorb the little hydrogen sulfide which is produced in the process of removing arsenic,and the absorbing liquid goes back to removing arsenic system. The water solution is closed circularly, and there is no waste water pushing outside.Concentrate antimony and carbonate go back to antimony for smelting,arsenide sulfur and barium sulfate are as products for saling. The waste gas, waste water and waste slag aren′t produced using the technique. The technological process is simple,the handling condition can be easily controlled, and the investment in equipment is small.
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