The grinding section is divided into three sections. The first section of the classifier overflow particle size is less than 0.074mm70%, and the second section is copper , lead , zinc and sulfur mixed concentrate re-grinding. The graded particle size is less than 0.074mm92~94%, and the third stage is desulfurization. The copper, lead and zinc mixed concentrates are reground, and the grinding grain size is less than 0.074mm96~98%.
The selection process uses a combined process of heavy and floating (full mixing-separation flotation), as shown in the figure below.
The lead and zinc mixed concentrate is dewatered in three stages, the concentrate contains less than 8% water, and the copper and sulfur concentrates are dehydrated in two stages.
The plant is characterized by re-election of coarse gold in a coarse grinding condition to obtain a gold concentrate with a grade of 360 g/t and a recovery of 40%. The flotation operation consists of full-mix flotation, desulfurization flotation and separation flotation of copper, lead and zinc, and is carried out in weakly alkaline, alkaline and weakly acidic medium respectively. In order to achieve the purpose of discarding tailings and reducing metal loss, copper, lead and zinc were mixed twice. The process is flexible in design and configuration for the destination of mixed coarsely-selected concentrates and the return location of the separated ore. It can adapt to the change of the original ore grade. When the ore grade is high, it can be produced according to the dotted line position in the above figure.
Beneficiation plant process indicators, consumption indicators and major equipment units are as follows:
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