Method for recovering sulfur from zinc oxygen pressure leached high-sulfur slag

Abstract

The invention discloses a method for recovering sulfur from zinc oxygen pressure leached high-sulfur slag, and belongs to the field of non-ferrous metal metallurgy. The method comprises the steps of firstly, performing blank roughing; adding lime into roughing tailings for size mixing, then adding a combined inhibitor of sodium sulfide, zinc sulfate and sodium sulfite, a collecting agent and a foaming agent, and carrying out two-stage dosing roughing; and after the concentrates I, II and III obtained through roughing are combined and mixed with lime, adding an inhibitor for second-stage concentration, wherein the concentrate II obtained through concentration is sulfur concentrate. According to the invention, separation of sulfur from minerals such as zinc sulfide, sulfate and silicate in the zinc oxygen pressure leaching high-sulfur slag is effectively achieved, the grade of sulfur products is improved, stockpiling of the zinc oxygen pressure leaching slag is reduced, favorable conditions are provided for comprehensive recovery of various elements, valuable elements such as lead, zinc and silver enter the tailing slag, the flotation tailings and the lead concentrate can be subjected to lead smelting together after ore blending, and then valuable elements such as lead, zinc and silver in the flotation tailings are further recycled.

Description

Technical field: [0001] The invention belongs to the field of non-ferrous metal smelting, and in particular relates to a method for recovering sulfur from zinc-oxygen pressure leaching of high-sulfur slag. Background technique: [0002] Sulfur products mainly come from natural sulfur mines and recycled sulfur. Since the 1990s, the global production of natural sulfur has continued to decline, while the amount of recycled sulfur has increased significantly. my country is a big sulfur consumption country, but domestically produced sulfur is relatively small, and the demand for sulfur is highly dependent on foreign countries. From a global perspective, the Middle East, North and South America, and the former Soviet Union countries are the main sources of sulfur supply. Domestic sulfur mainly comes from petroleum, natural gas, coal chemical industry and other inorganic salt chemical industry. Compared with natural sulfur ore, recovered sulfur has the advantages of high purity, ...

AI Technical Summary

Problems solved by technology

The sulfur recovery rate of the leaching slag is low in flotation without chemical addition, while the sulfide will float together with sulfur in the case of adding conventional flotation reagents, resulting in low grade of sulfur concentrate

In order to further obtain high-grade sulfur products, thermal filtration process is generally used after flotation, and a large amount of sulfur will be lost in the filter cake through thermal filtration, resulting in low recovery rate of elemental sulfur and high energy consumption.