【摘要】 在难浸金矿加熟石灰固砷、固硫焙烧预处理工艺的基础上，提出了选择性固砷焙烧新工艺。热力学分析表明，加入钙盐选择性固砷焙烧是可行的，钙盐的加入可减少甚至避免Ｆｅ２（ＳＯ４）３和ＦｅＡｓＯ４的形成，而且３ＣａＯ·Ａｓ２Ｏ５比ＣａＳＯ４更稳定，即３ＣａＯ·Ａｓ２Ｏ５比ＣａＳＯ４更易形成。试验研究结果表明，对于含砷１２１％，硫２０９９％、锑１３４％、碳３２６％的金精矿，经选择性固砷焙烧预处理，砷的固定率可达到９２％，而７８％～８４％的硫则以ＳＯ２气体挥发，金浸出率为９２％左右。更多还原

【Abstract】 Based on the pretreatment technigue of roasting difficulttoleach gold ore in the presence of slaked lime to fix arsenic and sulfur, the authors have developed a new arsenicfixing roast techniqhe for difficulttoleach gold ore. Thermodymanic analysis has shown that in the presence of calcium salts the arsenicfixing roast technique is feasible. The addition of calcium salts can reduce or even avoid the formation of Fe2(SO4)3 and FeAsO4. Also 3CaO·As2O5 has a higher stability than CaSO4, and therefore it is easy for the former to form compared with the latter. The test results have shown that after the pretreatment of gold concentrate containing 121% As, 2099% S, 134% Sb and 326% C by the arsenicfixing roast technique, an arsenicfixing ratio of 92% and a gold reach ratio of 92% can be achieved, and 78%～84% S is volatilized as SO2.更多还原