Application of Segmented Activation - Flotation to Silver Recover from a Zinc Leach Residue
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摘要:
某锌冶炼厂酸浸渣含银150~250 g/t，其中硫化银和单质银等可回收银仅占64.01%，银矿物粒度细且赋存形态复杂。针对该难选冶炼渣，采用分段活化—浮选工艺回收该酸浸渣中的银，并且控制矿浆Zn2+含量小于30 g/L，闭路试验可获得银精矿含银4 466.99 g/t、银回收率57.67%，相比现场银精矿品位及回收率均有较大幅度提升。
Abstract:The acid leaching residue of a zinc smelter contained Ag 150-250 g/t. Silver sulfide, elemental silver and other recoverable silver accounted for only 64.01%. The silver mineral size was fine and the occurrence form was complex. The silver in the acid leaching slag was recovered by the process of Segmented activation - flotation, and the content of Zn2+ in the pulp was controlled to be less than 30 g/L. Silver concentrate can be obtained by closed - circuit test with Ag grade 4 466.99 g/t and Ag recovery 57.67%, which was greatly improved compared with the grade and recovery of the on-site silver concentrate.
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Key words:
- zinc leaching slag /
- segmented activation /
- flotation
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表 1 锌酸浸渣多元素分析结果
Table 1. Multi-element analysis results of acid leaching residue
Element Ag* Zn Pb Cu Fe S SiO2 Other Content/% 245 20.03 2.05 0.96 21.33 6.97 7.57 41.02 *：g/t。 
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表 2 锌酸浸渣物相分析结果
Table 2. Phase analysis results of acid leaching residue
Ag Phase Ag2S Liberta Ag Ag2SO4 AgCl Ag2O Other Ag Distribution/% 50.80 13.21 5.39 4.24 10.89 15.47 Zn Phase ZnFe2O4 ZnS Zinc oxide Zn2SiO4 Distribution/% 59.98 12.87 10.21 16.94 Cu Phase CuFeS2 Cu2S CuS Copper oxide Distribution/% 50.21 5.23 3.86 40.7
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表 3 活化剂种类试验结果
Table 3. Test results of activator types
Types of activators Dosage/(g·t-1) Product name Yield/% Grade/(g·t-1) Recovery/% None 0 concentrate 10.77 754.00 32.98 tailings 89.23 184.87 67.02 total 100.00 246.14 100.00 ZJ-6 1000 concentrate 12.87 820.19 43.05 tailings 87.13 160.21 56.95 total 100.00 245.12 100.00 (NH4)2S 1000 concentrate 11.93 837.70 41.24 tailings 88.07 161.70 58.76 total 100.00 242.35 100.00 CuSO4 500 concentrate 11.21 750.90 35.12 tailings 88.79 175.06 64.88 total 100.00 239.59 100.00 CH4N2S 1000 concentrate 12.00 790.90 38.76 tailings 88.00 170.42 61.24 total 100.00 244.89 100.00 CH3CSNH2 1000 concentrate 11.78 846.00 40.96 tailings 88.22 162.82 59.04 total 100.00 243.30 100.00
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表 4 闭路试验结果
Table 4. Closed-circuit test results
Product Yield /% Grade Recovery Ag/(g·t-1) Cu/% Ag/% Cu/% concentrate 3.55 4 466.99 10.26 57.67 36.06 tailings 96.45 120.76 0.67 42.33 63.94 total 100.00 275.14 1.01 100.00 100.00
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