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

A technology of sodium sulfate and sodium sulfide, applied in the direction of alkali metal sulfide/polysulfide, etc., can solve the problems of low purity of sodium sulfide, large environmental pollution, complicated process, etc., and achieve improved reduction efficiency, low environmental pollution, and high purity high effect

Inactive Publication Date: 2020-12-04
PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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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.

Method used

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

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preparation example Construction

[0045] The method for preparing sodium sulfide of the present invention has the following advantages compared with traditional methods:

[0046] (1) The intermediate frequency induction blowing furnace is used as the reduction equipment, which saves energy and has high production efficiency;

[0047] (2) Use nitrogen to carry out dynamic stirring, reduce the consumption of reducing gas, make reducing gas and molten state sodium sulfate contact more fully simultaneously, improve reducing efficiency;

[0048] (3) It is an all-fire process, does not need to use water immersion process, and has less corrosion to equipment;

[0049] (4) the method is simple and feasible to operate, and can prepare high-purity sodium sulfide whose content is more than 90% by weight;

[0050] (5) Compared with the wet process, the environmental impact is small, and it mainly produces waste gas that can be absorbed, and does not produce waste water and waste residue.

Embodiment 1-4

[0053] (1) Add industrial sodium sulfate (industrial sodium sulfate is a by-product of sodium vanadium extraction process) to an intermediate frequency induction blowing furnace for heating, and heat it to a molten state; then inject nitrogen and reducing gas into the molten sodium sulfate The mixed gas is carried out blowing reduction, the molten sodium sulfate is reduced to molten sodium sulfide, and then the molten sodium sulfide is poured out from the intermediate frequency induction blowing furnace;

[0054] (2) the molten sodium sulfide poured out in the step (1) is cast;

[0055] In step (1), specifically, the schematic diagram of the cross-sectional structure of the intermediate frequency induction converting furnace is as follows figure 2 As shown, the intermediate frequency induction converting furnace includes a feeding device 1, a dust collection device 2, an induction coil 3, a heating body 4, a sliding nozzle 5 and a converting gun 6; the heating body 4 is a cyl...

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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) adding industrial sodium sulfate into a medium-frequency induction converting furnace for heating to a molten state; then mixed gas of nitrogen and reducing gas is injected into the molten sodium sulfate for converting reduction, the molten sodium sulfate is reduced into molten sodium sulfide, then the molten sodium sulfide is poured out of the medium-frequency inductionconverting furnace, and the volume ratio of the nitrogen to the reducing gas is 1: 0.1-1; and (2) pouring and molding the molten sodium sulfide poured out in the step (1). According to the method, industrial sodium sulfate is used as a raw material, a medium-frequency induction converting furnace is used as reduction equipment, mixed gas is blown for converting reduction, the method is simple andenvironmentally friendly, equipment corrosion is small, and the prepared sodium sulfide is high in purity.

Description

technical field [0001] The invention relates to the 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 storage mode ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B17/28
CPCC01B17/28C01P2006/80
Inventor 郝建璋任世磊
Owner PANZHIHUA IRON & STEEL RES INST OF PANGANG GROUP
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