Method for preparing sodium sulfide by smelting reduction of industrial sodium sulfate

Abstract

The invention relates to the technical field of sodium sulfide preparation, and discloses a method for preparing sodium sulfide by smelting reduction of industrial sodium sulfate. The method comprisesthe following steps: (1) mixing industrial sodium sulfate with a reducing agent, and carrying out ball milling to obtain a mixture with the fineness of less than or equal to 200 meshes, (2) adding the mixture obtained in the step (1) into a medium-frequency induction converting furnace, heating to a molten state, blowing mixed gas for converting reduction, reducing molten sodium sulfate into molten sodium sulfide, and pouring the molten sodium sulfide out of the medium-frequency induction converting furnace, and (3) pouring and molding the molten sodium sulfide poured out in the step (2), wherein in the step (1), the mass ratio of the industrial sodium sulfate to the reducing agent is 1: 0.4-1. According to the method, industrial sodium sulfate is used as a raw material, a reducing agentis added, the industrial sodium sulfate is molten and reduced into sodium sulfide through a full-fire method, the method is simple, environmentally friendly and small in equipment corrosion, and the prepared sodium sulfide is high in purity and content up to 90 wt% or above.

Description

technical field [0001] The invention relates to the technical field of sodium sulfide preparation, in particular to a method for preparing sodium sulfide through melting reduction of industrial sodium sulfate. Background technique [0002] At present, the vanadium extraction process mainly includes sodium vanadium extraction process and calcium vanadium extraction process, and the sodium vanadium extraction process is relatively mature, with high vanadium yield and low cost, but a large amount of industrial sodium sulfate will be produced in the production process, comprehensive utilization The difficulty is great, and the environmental protection pressure of enterprises is great. [0003] The Panzhihua Vanadium Factory of Panzhihua Iron and Steel Vanadium and Titanium Co., Ltd. adopts the process of extracting vanadium by sodium, and produces more than 70,000 tons of industrial sodium sulfate every year. At present, most of the industrial sodium sulfate produced in the sto...

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Problems solved by technology

[0004] The sodium sulfide prepared by reduction with industrial sodium sulfate as a raw material provides a good raw material selection for printing and dyeing, chemical industry, and non-ferrous mineral processing fields, but the prior art uses a water immersion process to prepare sodium sulfide with industrial sodium sulfate as a raw material. The process is complicated, and the obtained The purity of sodium sulfide is not high, which will cause serious environmental pollution, serious corrosion of equipment, and high energy consumption.

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