Discussion about the Application of Separation Process in the Middling of a Copper-Nickel Sulfide Ore
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摘要:
本文通过对金川硫化铜镍矿矿石性质的分析以及中矿单独再磨再选流程、两磨两选流程、两磨两选+中矿再磨流程应用前后指标的对比和流程分析，结合现场生产实际情况，分析其流程的特点、存在的问题，其分析结果认为，两磨两选工艺流程不论在总精矿镍品位还是在回收率指标上都优于中矿单独再磨再选流程。前者总精矿镍品位达到7.96%，比后者提高0.26%，镍回收率达到83.65%，比后者提高0.25%。两磨两选流程和两磨两选+中矿再磨流程对比后发现后者能使低精矿镍品位有较大幅度的提升，由实施前的3.95%提高到实施后的4.45%，同时总精矿镍品位由原来的8.061%提升到8.28%。
Abstract:Based on the analysis of copper-nickel sulfide ore, the comparison of indexes before and after the application of middling separate regrinding and reseparation process, two grinding and two separation process, two grinding and two separation + middling regrinding process and the analysis of the process. Combined with the actual production situation on site, the paper analyzes the problems existing in the characteristics of the process. The analysis results show that, two grinding and two separation process in both the total nickel concentrate grade and recovery index were superior to the middling separate regrinding and reseparation process. The former general nickel concentrate grade of 7.96%, 0.26% higher than that of the latter, nickel recovery rate reached 83.65%, 0.25% higher than the latter. Two grinding and two separation process and two grinding and two separation + middling regrinding process shows that the latter can make low nickel concentrate grade is greatly ascend, rose from 3.95% before the implementation to 4.45% after implementation, at the same time the total nickel concentrate grade from 8.061% to 8.28%
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Key words:
- Copper-nickel sulfide ore /
- Beneficiation /
- Middling /
- Regrinding and reconcentration
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表 1 两种流程指标对比分析结果
Table 1. Comparative analysis results of two processes
流程特点 原矿/
%总精矿镍
品位/%低精镍
品位/%总精镍回
收率/%中矿再磨单独
再选流程1.26 7.70 3.64 83.4 两段磨矿两段选别 1.21 7.96 4.18 83.65 
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表 2 两种流程指标数据情况
Table 2. Index data of two processes
项目 原矿品
位/%低精品
位/%总精品
位/%总回收
率/%两磨两选流程 1.363 3.95 8.061 85.68 两磨两选+中矿再磨 1.333 4.45 8.280 85.72
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表 3 两种流程镍品位对比结果分析
Table 3. Comparison results analysis of two processes
产品二段粗选
泡沫/%二段一次
扫选泡沫/%二段二次扫选泡沫/% 二段二次
精选泡沫/%二段一次
尾矿/%两磨两选流程 1.7 1.18 1.41 3.4 1.41 两磨两选+中矿再磨 1.97 1.37 1.1 4.4 1.35
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表 4 中矿再磨给料粒度组成及Ni金属含量分布
Table 4. Particle size composition and Ni content distribution of middlings regrinding feed
粒度/μm 产率/% 品位/% 金属分布率/% 累计金属分布率/% +96 3.00 1.32 2.98 2.98 −96+80 9.17 1.64 11.31 14.29 −80+74 2.17 1.67 2.72 17.02 −74+44.6 8.43 2.49 15.78 32.79 −44.6+28.8 34.11 1.48 37.96 70.75 −28.8+21.2 26.27 0.96 18.96 89.72 −21.2+15.0 10.59 0.92 7.33 97.04 −15+11.3 2.17 0.89 1.45 98.49 −11.3 4.09 0.49 1.51 100.00 合计 100.00 1.33 100.00 /
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表 5 中矿再磨后产品粒度组成及Ni金属含量分布/%
Table 5. Particle size composition and Ni metal content distribution of middling products after regrinding
粒度/μm 产率/% 品位/% 金属分布率/% 累计金属分布率/% +96 2.29 1.37 2.39 2.39 −96+80 6.69 1.66 8.48 10.88 −80+74 1.78 1.60 2.17 13.05 −74+44.6 6.28 2.55 12.21 25.26 −44.6+28.8 30.42 1.56 36.23 61.48 −28.8+21.2 26.19 1.10 21.99 83.47 −21.2+15.0 9.83 1.08 8.10 91.57 −15+11.3 2.88 0.99 2.18 93.75 −11.3 13.64 0.60 6.25 100.00 合计 100.00 1.31 100.00 /
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