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This paper describes the use of all-wet process in two steps to deal with the complexity of domestic factory soot washed residue containing lead , including comprehensive recycling of lead, bismuth , tin, silver , indium and other valuable metals testing process , lead product obtained reach the industrial secondary standard ; bismuth analytical grade products meet requirements ; higher grade ammonium chloride tin impurity content can be less than 0.1% ; germanium, indium and silver enrichment , quality is also higher for these valuable elements comprehensive recovery and lay a good foundation. Major transformation during the test , dip preparation of lead and lead products , CR, bismuth preparation products , tin and tin products recycling preparation, liquid handling , and several other conversion processes . Conversion process which utilize PbCO 3 solubility product than PbSO 4 smaller principle, the PbSO 4 into PbCO 3 < / sub>, thereby removing sO 4 2 - ; leaching of lead and lead products during preparation , leaching of lead , lead and a small amount of bismuth nitrate form of access solution , leaching solution neutralized Shen Bi , so that one of bismuth to precipitate in the form of removal , and in the sink lead the process, lead nitrate to form PbSO 4 precipitation makes nitric acid regeneration, clean after washing with caustic soda were generated in and tribasic lead sulfate or massicot ; CR process, bismuth, arsenic , tin, copper , zinc and other metal carbonates and oxides are dissolved in hydrochloric acid , while also reducing dissolved arsenate and 100 ~ 125 ℃ temperature , AsCl 3 and GeCl 4 , SnCl 4 , HCl and other low- boiling distillate Break chloride , and then Na 2 S , respectively, germanium and arsenic precipitation and regeneration hydrochloric acid ; bismuth product preparation process, first with ammonia and BiCl 3 solution , hydrolysis of crude bismuth oxychloride , crude bismuth oxychloride impurities washed first with dilute nitric acid , sulfuric acid wash and then by copper, tin , zinc, iron and other impurities , and by alkali and removing SO 4 and 2 - tin, arsenic , selenium, tellurium and other impurities in the crude alkali-soluble bismuth oxide with an appropriate concentration and the amount of bismuth nitrate were dissolved , and then neutralized with aqueous ammonia and nitric acid bismuth is bismuth nitrate obtained , bismuth nitrate obtained by the conversion of ammonium bicarbonate bismuth carbonate ,
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