Research on Thermal Activation Pretreatment and Sulfuric Acid Leaching of Cobalt-Copper Sulfide Concentrates from Congo (Kinshasa)
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摘要:
针对刚果（金）硫化钴铜精矿矿物组成复杂、直接酸浸效果较差等物料特性，研究了热活化-硫酸浸出工艺来强化有价金属铜、钴的回收，取得了理想的浸出效果。试验结果表明，当硫化钴铜精矿、氧化钴矿和无水碳酸钠质量配比为1 GA6FA 3 GA6FA 0.4，于500℃温度下热活化2 h，所得焙砂在初始硫酸浓度为1.25 mol/L，液固比为5 GA6FA 1 mL/g，浸出为温度80℃，搅拌转速为300 r/min的条件下反应时间5 h，钴的浸出率为98.51%、铜的浸出率为97.80%，试验采用的工艺可实现硫化钴铜精矿中钴和铜的高效回收利用。
Abstract:Due to the complex mineral composition of Congo cobalt sulphide copper concentrate and the poor effect of direct acid leaching, the thermal activation pretreatment and sulfuric acid leaching process was investigated to strengthen the recovery of copper and cobalt. The test results showed that the leaching rate of cobalt and copper was 98.51% and 97.80% respectively obtained by the calcine generated from thermal activation at 500℃ for 2 h with the mass ratio of cobalt sulfide copper concentrate, cobalt oxide ore and anhydrous sodium carbonate of 1 GA6FA 3 GA6FA 0.4 reacting for 5 hours under the conditions of the initial concentration of sulfuric acid of 1.25 mol/L, liquid-solid ratio of 5 to 1 mL/g, leaching temperature of 80℃, and the stirring speed of 300 r/min. The process adopted in the experiment can realize the efficient recovery and utilization of cobalt and copper in the cobalt-copper sulfide concentrates.
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Key words:
- copper-cobalt sulfide concentrates /
- cobalt oxide mine /
- thermal activation /
- sulfuric acid /
- leaching
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表 1 硫化钴铜矿中主要元素含量 /%
Table 1. Main chemical composition of copper-cobalt sulfide concentrates
Co Cu Fe Ca Ni Mn Mg Zn S 8.45 20.94 15.65 0.36 0.47 0.09 1.84 0.01 16.74 
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表 2 氧化钴矿中主要元素含量/%
Table 2. Main chemical composition of cobalt oxide mine
Co Cu Fe Ca Ni Mn Mg Zn S 12.15 1.08 1.70 0.20 0.05 0.96 0.75 0.01 0.11
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表 3 平行试验结果
Table 3. Results of parallel experiments
Leaching rate Co/% Cu/% 1 98.49 98.38 2 98.38 97.53 3 98.65 97.48 Average 98.51 97.80
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