Environment-friendly refining method of sodium sulfide

Abstract

The invention discloses an environment-friendly refining method of sodium sulfide. The method is high in production efficiency and less in environmental pollution, and can be used for obtaining the high-purity sodium sulfide product. The method comprises the following steps: (1) evenly mixing pulverized coal and anhydrous thenardite according to a mass ratio of 1 to (3-4), and then calcining at 70-1000 DEG C to generate a rough blank of the sodium sulfide; (2) filling with a thermalized container with billet water at the room temperature, and dissolving the hot rough blank of the sodium sulfide in the billet water at the normal temperature to form heated billet water; when every liter of the heated billet water in the thermalized container contains 370g of the sodium sulfide or more, introducing new low-concentration cleaning alkali sulfide water or clear water from the bottom of the thermalized container, and enabling the heated billet water at the upper part of the thermalized container to be replaced into a sedimentation tank of the next process; (3) settling the sodium sulfide liquid subjected to blank formation in the sedimentation tank, and screening out the primary refined sodium sulfide; (4) enabling the primary refined sodium sulfide to be subjected to evaporation extraction to obtain the sodium sulfide crystals.

Description

technical field [0001] The invention relates to an environment-friendly refining method of soda sulfide, which belongs to the technical field of soda sulfide production. Background technique [0002] Sodium sulfide is also called smelly alkali, smelly soda, yellow alkali, and alkali sulfide. Sodium sulfide is an inorganic compound, and pure sodium sulfide is a colorless crystalline powder. Strong hygroscopicity, easily soluble in water. The aqueous solution is a strong alkaline reaction. Causes burns on contact with skin and hair. So sodium sulfide is commonly known as alkali sulfide. Sodium sulfide aqueous solution will be slowly oxidized into sodium thiosulfate, sodium sulfite, sodium sulfate and sodium polysulfide in air. Due to the rapid formation of sodium thiosulfate, the main product of oxidation is sodium thiosulfate. Sodium sulfide deliquesces in the air, and is carbonized and deteriorated, releasing hydrogen sulfide gas continuously. The color of industrial ...

AI Technical Summary

Problems solved by technology

The formation of a hard shell blocks the cooling of the base water to the inside of the crude alkali, plays a role of heat preservation inside the crude alkali, and also increases the energy for the accumulation of steam, which eventually leads to the phenomenon of blasting

[0008] In the manufacturing process of sodium sulfide, due to the difference in raw materials, there may be insufficient purity of the manufactured sodium sulfide. Industrial sodium sulfide has many impurities and high iron content, which will affect the quality of the final product during the application process.