Experimental study on valuable metal recovery by flotation of cyanide residue and its application
To improve the resource utilization rate of cyanide residue and address the issues of low grade and recovery rates of valuable metal in flotation concentrates from gold cyanidation tailings,an analysis of the properties of cyanidation tailings and experimental studies on the recovery of copper,lead,and zinc were conducted.Based on the experimental results and actual on-site conditions,process optimization and reagent regime adjustments were imple-mented.Production practice shows that by adopting a lead preferential flotation followed by copper flotation process,with the lead flotation regulator ZJT at 3000 g/t,diethyldithiocarbamate at 100 g/t,copper flotation regulator ZJT at 2500 g/t,and collector ZJB-2 at 100 g/t,and using a flotation process of once roughing,twice cleaning,and twice scavenging,lead concentrate with a lead grade of 22.32%and a lead recovery rate of 45.76%,zinc concentrate with a zinc grade of 14.17%and a zinc recovery rate of 31.78%,and copper concentrate with a copper grade of 15.38%and a copper recovery rate of 45.76%can be obtained.After the process optimization,the combined lead and zinc grade in lead concentrate increased by 8-40 percentage points,and the copper grade in copper concentrate increased by 3-13 percentage points.
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