Abstract
Zinc occupies a vital position in modern industrial production, and zinc metal is mainly extracted from marmatite or sphalerite. Marmatite or sphalerite is often associated with pyrite and pyrrhotite in natural polymetallic sulfide deposits. Therefore, how to well achieve the selective separation of marmatite or sphalerite from associated pyrite and pyrrhotite is an important issue, because it is directly related to the efficient and sustainable utilization of zinc-bearing sulfide mineral resources. In this paper, a systematic research taking the selective separation of marmatite from high-sulfur sulfide ores as its core, was conducted. The results confirmed that pulp redox potential (Eh) as well as dissolved oxygen (DO) dominated the selective separation of marmatite from associated pyrite and pyrrhotite, and the Zn recovery and Zn grade of zinc concentrates could be greatly improved by controlling Eh. As a result, an effective and feasible operating mechanism with two-step Eh regulation was first established. The findings are expected to help scholars understand the marmatite-pyrite/pyrrhotite (Zn-S) selective flotation better, favor the beneficiation of high-sulfur polymetallic sulfide ores in study or practice, and provide important inspirations for the theoretical research or practical utilization on other similar sulfide resources, especially those containing pyrrhotite.
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