An increase in the quality of the lead concentrate is reached due to the opening of aggregates of galenite with sphalerite and pyrite. The increase in the characteristics of ore concentration is explained by an increase in the content of metals in feeding the flotation and by a decrease of the ratio of the zinc content to the lead the zinc module.
The lead concentrate was indeed very poor quality. The concentrate grade ranged from to percent lead at very low lead recovery from the feed. The concentrate was heavily contaminated with copper, zinc and sulphur (pyrite). The copper metallurgical performance was better, on average, 81 percent of the copper in the feed was .
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