含金物料熔融氯化提金中试探索

在小试基础上,分别对氰化尾渣和焙砂进行熔融氯化工艺中试,考察电炉工艺对不同条件的适应情况。氰化尾渣试验结果表明:添加4%～12%的氯化钙,金挥发率最高可以达到99%,渣含金可控制在0.5g/t以下。焙砂(炉底积料)试验结果表明:原料金品位89.64g/t,因铁硅比高,渣沉降效果差,导致渣含金2～7g/t。工程设计过程中,应该控制原料水分、调节熔渣成分、考虑分段挥发,确保金属充分回收。

Pilot Scale Test to Recover Gold from Gold-bearing Material by Molten Chlorination

Based on results of laboratory experiment, pilot scale test of molten chlorination process self-developed by BGRIMM to treat cyaniding tailings and calcine was conducted. Adaptation of electric furnace process in different conditions was investigated. The test results of cyaniding tailings show that the highest gold volatilization rate is 99% and gold content in slag can be controlled at 0.5 g/t below with addition of 4%-12% calcium chloride. The test results of calcine (bottom materials of roasting furnace) with gold content of 89.64 g/t show that gold content in slag is 2-7 g/t due to high Fe/Si ratio and poor sedimentation of slag. In order to insure sufficient metal recovery, moisture of raw material should be controlled, slag composition should be adjusted, and subsection volatilization during engineering design should be considered.