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含闪锌矿、方铅矿和黄铜矿的复合硫化物以及在基体中含少量银的黄铁矿,在120℃和氧压为1000千帕时,于1—2N HCl中,经过90分钟便可以分解,溶液中锌的产率>97％,铜的产率>95％,而约83％的铅(以PbCl_2和PbSO_4形式),85％的银与大部分黄铁矿一起留于残渣中、就ZnS、PbS和CuFeS_2而言,元素硫的回收率接近100％。酸的当量相等时,在HCl中浸出比在H_2SO_4中快。溶解过程是一个受扩散控制的过程(与搅拌速度有很大关系,活化能为3.6千卡/摩尔)。当使用H_2SO_4作浸出剂时,形成的主要是铅黄钾铁矾Pb_(0.5)Fe_3(SO_4)_2(OH)_6。
Complex sulfides containing sphalerite, galena and chalcopyrite, and pyrite with a small amount of silver in the matrix, were heated in 1-2 N HCl at 120 ° C and oxygen pressure of 1000 kPa for 90 minutes Can decompose, the yield of zinc in solution is> 97%, the yield of copper is> 95%, and about 83% lead (in the form of PbCl_2 and PbSO_4), 85% silver remains with the majority of pyrite in the residue In the case of ZnS, PbS and CuFeS 2, elemental sulfur recovery is close to 100%. When the acid equivalents are equal, leaching is faster in HCl than in H 2 SO 4. The dissolution process is a diffusion-controlled process (which is strongly related to the agitation rate, with an activation energy of 3.6 kcal / mol). When H_2SO_4 was used as a leaching agent, Pb_ (0.5) Fe_3 (SO_4) _2 (OH) _6 was formed mainly from lead jarosite.