Test on Iron Recovery by Leaching and Magnetic Separation from a Laterite-type Gold Mine in Western Yunnan Province
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摘要:
研究对象为滇西某红土型氧化金矿，该金矿原矿Au品位1.72 g/t，共伴生Ag 17.50 g/t、TFe 28.19%（mFe含量11.52%），该金矿属低品位复杂难选多金属氧化金矿。针对前期开展的“原矿洗矿分级-泥沙分选，泥选系统预选抛尾”产出的粗砂及预选粗精矿，提出了“砂选系统全泥氰化浸金银－浸渣弱磁、强磁选铁，泥选系统预选粗精矿氰化浸金、银”的技术路线，本研究开展了系统的回收Au、Ag、Fe的工艺实验研究，并对各工艺环节中，工艺参数对指标的影响进行了详细的分析。实验结果表明，该工艺技术指标较为优良，最终可获得Au浸出率88.99%，Ag浸出率31.52%，Fe回收率57.57%的全流程技术指标。
Abstract:The present study focuses on the comprehensive utilization of resources, specifically examining a laterite oxidized gold deposit located in western Yunnan Province. In this gold ore, the Au grade is 1.72 g/t, accompanied by 17.50 g/t Ag and 28.19% TFe (with an mFe content of 11.52%), which belongs to a low-grade complex and refractory polymetallic gold ore. A technical route of "the whole mud cyanidation leaching of gold and silver in the sand separation system-low and high magnetic separation iron from leaching slags, and cyanidation leaching of gold and silver from the pre-selected coarse concentrate in the mud separation system" was proposed, for the coarse sand and pre-selected coarse concentrate produced by the process of "raw ore washing classification-sand separation, pre-concentration for discarding tailings in the mud selection system". This study conducted a systematic process test research on the recovery of Au, Ag, and Fe, analyzing the impact of process parameters on the various indicators. The results showed that the process achieved excellent technical indicators, and finally, an Au leaching rate of 88.99%, an Ag leaching rate of 31.52%, and an Fe recovery rate of 57.57% were respectively obtained in the whole process.
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表 1 泥选系统预选抛尾实验结果
Table 1. Results of pre-selection tail throwing test of the mud separation system
产品名称 作业产率/% 品位/% 作业回收率/% Fe Au* Ag* Fe Au Ag 砂矿 57.25 39.26 2.798 20.19 79.73 93.13 66.05 混和粗精① 22.35 16.19 0.329 14.38 12.83 4.28 18.36 抛尾尾矿 20.42 10.27 0.219 13.36 7.44 2.59 15.59 给矿 100.00 28.19 1.720 17.5 100.00 100.00 100.00 *单位为g/t。
①预选粗精为弱磁粗精与强磁粗精的混合粗精矿。
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表 2 原矿浸出实验结果
Table 2. Results of the raw ore leaching test
产品
名称品位/（g/t） 对原矿回收率/% 作业浸出率/% Au Ag Au Ag Au Ag 浸渣 0.151 11.17 8.78 63.83 91.22 36.17 给矿 1.72 17.5 100.00 100.00
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表 3 预选粗精矿浸出实验结果
Table 3. Leaching test results of pre-selected mixed coarse concentrate with tail dumping
产品名称 品位/（g/t） 对原矿回收率/% 作业浸出率/% 对原矿浸出回收率/% Au Ag Au Ag Au Ag Au Ag 浸渣 0.110 8.09 1.43 10.33 66.56 43.73 2.85 8.03 给矿 0.329 14.38 4.27 18.36
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