Experimental Research on Recovery Copper and Iron from Copper Smelting Slags by Direct Reduction Roasting-magnetic Separation
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摘要:
这是一篇冶金工程领域的论文。某铜冶炼渣浮选尾渣中铁品位为37.42%，铜品位为1.86%，根据其矿石性质特点，采用烟煤作为还原剂，应用直接还原焙烧-磁选工艺回收铜尾渣中铜铁，实验结果表明：将铜冶炼渣、烟煤和生石灰（作为助还原剂）按 100∶25∶20的质量比混合，在焙烧温度定
1200 ℃，时间为80 min，磨矿细度为-0.045 mm 80%，磁场强度为0.139 T条件下可获得铁品位为90.98%，铁回收率为90.13%，铜品位为5.82%、铜回收率为 87.38%的含铜铁精矿，实现了冶炼渣铜中铜铁的综合回收。Abstract:This is an article in the field of metallurgical engineering. Torecover copper and iron from a copper smelting slag flotation tailingwith iron grade of 37.42% and copper grade of 1.86%, according to the characteristics of its ore properties, the bituminous coal was used as a reductant, the process of direct reduction roasting - magnetic separation was applied.The experimental results show that copper smelting slag, bitumite and quicklime (as a co-reducing agent) are mixed in the mass ratio of 100∶25∶20, and at the conditions of roasting temperature of 1 200 ℃, time of 80 min, the roasted ores gringding fineness of -0.045 mm 80%, and magnetic strength of 0.139 T, the copper-bearing iron ore concentrate can be obtained with an iron grade of 90.98%, iron recovery of 90.13%, copper grade of 5.82% and copper recovery of 87.38%, thus realizing the comprehensive recovery of copper and iron from copper smelting slags.
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表 1 铜尾渣主要元素分析结果/%
Table 1. Main-element analysis results of copper tailing slags
Cu Pb Zn S TFe As Al2O3 MnO MgO SiO2 P CaO Au* Ag* 1.86 0.60 2.12 0.66 37.42 0.02 3.47 0.58 2.55 34.35 0.03 3.94 0.33 15.70 *单位为g/t 
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表 2 铜尾渣铜物相分析结果
Table 2. Analysis results of copper phase of copper tailing slags
相别名称 原生铜 次生铜 氧化铜 金属铜 全铜 含量/% 1.28 0.42 0.06 0.10 1.86 占有率/% 68.82 22.58 3.23 5.37 100.00
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表 3 铜尾渣铁物相分析结果
Table 3. Analysis results of iron phaseof copper tailing slags
相别
名称磁性
铁中铁赤、褐铁
矿中铁硅酸
铁中铁菱铁
矿中铁硫化
铁中铁全铁 含量/% 12.41 0.38 23.82 0.12 0.69 37.42 占有率/% 33.16 1.02 63.66 0.32 1.84 100.00
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表 4 最终精矿产品多元素分析结果/%
Table 4. Multi-element analysis results of the final concentrate products
TFe Cu Pb Zn MnO S SiO2 MgO CaO Al2O3 As P 90.98 5.82 0.03 0.02 0.08 0.02 0.52 0.23 0.07 0.07 0.02 0.08
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