Study on Improving Beneficiation Indexes for a Lead and Zinc Sulfide Ore in Sichuan by Using a New Collector Y2
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摘要:
四川某铅锌硫化矿方铅矿、闪锌矿和黄铁矿嵌布关系复杂。现场在中性条件下，以25#黑药作铅捕收剂浮铅，浮铅尾矿再选锌，获得的铅、锌精矿品位偏低、且精矿中铅、锌互含严重，难以实现高效回收铅、锌资源。为此，针对该铅锌硫化矿矿石性质，在高碱条件下，以具有较好选择性和捕收性的铅高效捕收剂Y2浮铅，硫酸锌作锌矿物抑制剂，经一次粗选、三精精选获得铅精矿，粗选尾矿经两次扫选后再选锌。试验室小型闭路试验研究结果表明，在原矿含铅1.39%、含锌2.38%的情况下，可获得铅精矿含铅50.34%、含锌6.59%、铅回收率80.61%，锌精矿含锌49.44%、含铅1.94%、锌回收率88.60%的较好指标。与现场工艺相比，铅精矿中铅品位提高了6.46%、铅回收率提高了7.04%、杂质锌含量降低2.23%，锌精矿中锌品位提高6.02%、锌回收率提高5.06%、杂质铅含量降低0.9%，使用新型捕收剂Y2的优越性明显。
Abstract:The dissemination relationship of galena, sphalerite and pyrite is complex in a lead and zinc sulfide ore located in Sichuan Province. The grade of lead and zinc concentrate obtained by the separation process of "lead tailings-zinc" with the collector of the 25# aerofloat and the neutral condition was relatively low, and the lead and zinc in the concentrate were severely contained in each other. It was difficult to achieve the efficient recycling of lead and zinc resources. Therefore, based on the properties of the lead-zinc sulfide ore, reagent Y2 with the better ability of selectivity and collection was used as the collector to sorting lead, while the zinc sulfate was used to the depressant under the condition of high alkali. The lead concentrate was obtained by the process of " one rough separation- three fine selections", and the zinc was obtained after the process of "two scavengings of roughing tailings". Laboratory small-scale closed-circuit test results showed that the lead concentrate with the lead content of 50.34%, the zinc content of 6.59% and the lead recovery of 80.61%, and the zinc concentrate with the zinc content of 49.44%, the lead content of 1.94% and the zinc recovery of 88.60% was obtained under the condition of the raw ore with the lead content of 1.39% and the zinc content of 2.38%. Compared with the on-site process, the indicators of laboratory small-scale closed-circuit test was better. For the lead concentrate, the lead grade had increased by 6.46%, the lead recovery had increased by 7.04%, and the impurity zinc content had reduced by 2.23%. For the zinc concentrate, the zinc grade had increased by 6.02%, the zinc recovery had increased by 5.06%, and the impurity lead content had reduced by 0.9%, which demonstrated that the new collector Y2 has better applicability.
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表 1 原矿的主要化学成分
/% Table 1. Main chemical elements of raw ore sample
Pb Zn S Fe Cu SiO2 MgO 1.39 2.38 7.93 3.34 0.04 41.30 0.45 Al2O3 As CaO Mn Cd Ag* Au* 2.11 0.03 9.15 0.02 0.05 18.43 0.11 注: Au、Ag的含量单位为g /t。 
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表 2 矿石中铅化学物相分析结果
/% Table 2. Chemical phase analysis of lead in sample
Lead phase Grade Distribution rate Lead sulfide 1.27 91.37 Lead Oxidized 0.09 6.47 Lead Bound 0.03 2.16 Total Lead 1.39 100.00
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表 3 矿石中锌化学物相分析结果
/% Table 3. Chemical phase analysis of zinc in sample
Zinc phase Grade Distribution rate Zinc sulfide 2.32 97.48 Zinc Oxidized 0.05 2.10 Zinc Bound 0.01 0.42 Total zinc 2.38 100.00
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表 4 不同工艺闭路试验结果
/% Table 4. Results of different closed-circuit process
Technology Product Productivity Grade Recovery Pb Zn Pb Zn New technology Pb concentrate 2.22 50.34 6.59 80.61 6.23 Zn concentrate 4.21 1.94 49.44 5.89 88.60 Tailings 93.57 0.20 0.13 13.50 5.17 Mine-run 100.00 1.39 2.35 100.00 100.00 The original technology Pb concentrate 2.35 43.88 8.82 73.57 8.69 Zn concentrate 4.52 2.84 43.42 9.16 82.32 Tailings 93.13 0.26 0.23 17.27 8.98 Mine-run 100.00 1.40 2.38 100.00 100.00
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