Preparation process of sodium sulfide with low content of iron

Abstract

The invention discloses a preparation process of sodium sulfide with low content of iron, and involves the field of production of industrial sodium sulfide. The preparation process includes the steps: preparing thenardite from mirabilite as a raw material; mixing thenardite with pulverized coal, and preheating the obtained mixture in a preheater; adding the preheated materials into a converter from the tail part, adding fuel coal into the converter from the head, and reacting the thenardite with the pulverized coal to generate sodium sulfide; conducting hot melting on the sodium sulfide in a hot melting tank, and sending a supernatant obtained after precipitation to a storage tank; sending concentrated alkali water in the storage tank into a clarification tank; sending a clear alkali liquid into a reaction tank, adding an iron removal agent, performing a sufficient reaction of the iron removal agent and impurities in the clear alkali liquid, allowing the obtained material to stand, discharging precipitated insoluble matters into a mud groove and sending alkali liquor after standing into an evaporating pot; concentrating the alkali liquor; sending concentrated alkali liquor into a tableting machine to form flaky sodium sulfide, packaging sodium sulfide and preparing the packaged sodium sulfide for sell. The preparation process can effectively reduce the content of iron in sodium sulfide.

Description

technical field [0001] The invention relates to the field of industrial sodium sulfide production, in particular to a production process of sodium sulfide. Background technique [0002] In the production of industrial sodium sulfide, the main production method is the method of reducing mirabilite (sodium sulfate) with pulverized coal (carbon) at high temperature. The key equipment for the production of industrial sodium sulfide by this method is a high-temperature reaction furnace. [0003] In the past production, the high-temperature reaction furnace of industrial sodium sulfide has used manual turning reverberatory furnace (open hearth furnace), mechanical turning intermittent production converter (ie short converter) and mechanical turning continuous production converter (ie long converter). ) three kinds. Open hearth furnaces have been eliminated due to low production efficiency, high labor intensity, and serious environmental pollution; in the mid-1950s, short converte...

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Problems solved by technology

[0005] Although the above scheme has greatly improved the quality of sodium sulfide products and the utilization rate of mirabilite, and can promote the development of industrial sodium sulfide production from small-scale and intermittent to large-scale, continuous, and labor-saving, the above-mentioned scheme has not adopted Effective measures control the iron content of the produced sodium sulfide, which in turn leads to a higher iron content in the produced sodium sulfide. Usually, the iron content of the produced sodium sulfide reaches 150PPM. With the development of the times, the iron content of the produced sodium sulfide is higher. Sodium sulfide with high iron content can no longer meet the needs of industry, so there is an urgent need for a production process that can effectively reduce the iron content in sodium sulfide