Understand the production process of sodium sulfide_Industrial additives

A granular sodium sulfide production process, including raw materials – calcination – hot melt – clarification and mud washing – chemical impurity removal – precipitation – evaporation concentration and other processes, and the concentrated sodium sulfide solution is stored in a reactor or agitator , the sodium sulfide content is ≥60%, it is pumped out by the pump, and the impurities are filtered through the filter. The temperature of the sodium sulfide solution entering the granulator is 130-150°C, the delivery pressure is 0.3-0.5MPa, and it is sprayed through the machine head nozzle, and the steel is It is cooled and formed on the belt cooler, and the solidified particles are discharged into the unloader and vacuum packed or sealed in a plastic bag to obtain the finished product.

Sodium sulfide production process

A granular sodium sulfide production process, including raw materials – calcination – hot melt – clarification and mud washing – chemical impurity removal – precipitation – evaporation concentration and other processes, and the concentrated sodium sulfide solution is stored in a reactor or agitator , the sodium sulfide content is ≥60%, it is pumped out by the pump, and the impurities are filtered through the filter. The temperature of the sodium sulfide solution entering the granulator is 130-150°C, the delivery pressure is 0.3-0.5MPa, and it is sprayed through the machine head nozzle, and the steel is It is cooled and formed on the belt cooler, and the solidified particles are discharged into the unloader and vacuum packed or sealed in a plastic bag to obtain the finished product. The above-mentioned granular sodium sulfide production process has reasonable design and advanced technology. Based on the unique physical properties of sodium sulfide concentrate, granulation process conditions and granulation equipment are provided, so that sodium sulfide products can be granulated, and vacuum packaging technology can be applied, effectively It effectively prevents the deliquescence and oxidation of sodium sulfide products, thereby extending the storage time. Granulated products can use automatic packaging systems to reduce labor intensity, improve the working environment, and reduce packaging costs.

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1. A granular sodium sulfide production process, including raw material process – calcination process – hot melt process – clarification mud washing process – chemical impurity removal process – precipitation process – evaporation concentration process, its characteristics The sodium sulfide solution after evaporation and concentration, with a sodium sulfide content of ≥60%, is pumped out by a pump, and the impurities are filtered through a filter. The temperature of the sodium sulfide solution entering the head of the granulator is 130-150°C, and the delivery pressure is 0.3-0.5 Mpa, sprayed out through the nozzle of the machine head, cooled and formed on the steel belt cooler, the solidified particles are discharged into the unloader, and vacuum packed or sealed in plastic bags to obtain the finished product.

A method for preparing anhydrous, high-purity sodium sulfide [CN25049-0013-0001]

[Abstract] The present invention relates to a method for preparing anhydrous, high-purity sodium sulfide by drying the water-containing sodium sulfide so that the Na2S content is at least 98wt.%. The method used is to combine the water-containing sodium sulfide with water-insoluble sodium sulfide The miscible organic solvents are heated together to a temperature 10-20°C lower than the melting point of hydrated sodium sulfide; and then heated in steps, with each step increasing the temperature by 1-10°C and held for 5-15 minutes until it is 10-20°C higher than the melting point of hydrated sodium sulfide. At 20°C; continue to heat to the boiling point of the water-solvent mixture, perform azeotropic distillation under vacuum or pressure, and distill away the crystal water.

Preparation method of anhydrous sodium sulfide crystal [CN25049-0012-0004]

[Abstract] The present invention relates to a method for preparing anhydrous sodium sulfide crystals. The method is to add an auxiliary agent to the sodium sulfide solution prepared by reducing sodium sulfate with pulverized coal and then crystallize it after removing impurities to obtain a crystal containing 9 crystal waters or 5.5 sodium sulfide crystals of crystallized water are then heated and dried under reduced pressure conditions. The characteristic is that the drying temperature is closely related to the pressure, thus avoiding the coalescence of hydrates or sticking to the dryer. The anhydrous sodium sulfide crystals obtained by this method have the characteristics of high purity, large specific surface area, and uniform particles, and can fully meet the quality requirements of anhydrous sodium sulfide during the synthesis of polyphenylene sulfide (pps).

Preparation method of sodium sulfide crystal [SY25049-0001-0005]

[Abstract] The present invention relates to a method for preparing Na2S·5.5H2O, sodium sulfide crystals and a method for preparing anhydrous sodium sulfide crystals using Na2S·5.5H2O sodium sulfide crystals. This method is to add additives to the sodium sulfide solution prepared by reducing sodium sulfate from pulverized coal to remove impurities, and then crystallize it under certain conditions to obtain sodium sulfide crystals containing 5.5H2O. The crystals are heated with non-oxidizing gas under normal pressure. Heating is characterized by controlling the gas temperature and pressure to avoid hydrate bonding and at the same time, the water is taken away by the gas. The anhydrous sodium sulfide crystal obtained by this method has the characteristics of high purity, large specific surface area and uniform particles.

Production method of high-purity crystalline sodium sulfide [SY25049-0029-0007]

[Abstract] The invention discloses a method for producing high-purity crystalline sodium sulfide and by-product paper iron sodium sulfide. It includes using barium sulfide calcined material as raw material, leaching, acidolyzing the leach liquid to produce H2S and purifying it, and then passing the ion membrane caustic soda absorption reaction to obtain sodium sulfide solution, and then evaporating, concentrating, cooling and crystallizing, and centrifugal separation to obtain high Pure colorless crystalline sodium sulfide product; the mother liquor after centrifugal separation is then evaporated, concentrated, and cooled to crystallize to obtain solid low-iron sodium sulfide. The invention has a wide source of raw materials, and the barium and sulfur elements contained in the raw materials can be utilized respectively. The use of ion membrane caustic soda absorption reaction can effectively improve its purity, and the production cost is reduced by 40 to 50% compared with the background technology. Therefore, the process flow is simple and reliable, the crystallized sodium sulfide produced is high-purity colorless crystal, the Fe content of the by-product low-iron sodium sulfide is ≤20PPm, the comprehensive utilization efficiency of raw materials is high, and it can significantly reduce production costs and improve economic benefits.

Preparation method of anhydrous sodium sulfide crystalsIn the reactor or agitator, the sodium sulfide content is ≥60%. It is pumped out by the pump, and the impurities are filtered through the filter. The temperature of the sodium sulfide solution entering the granulator is 130-150°C, and the delivery pressure is 0.3-0.5MPa. The machine head nozzle is ejected and cooled and formed on the steel belt cooler. The solidified particles are discharged into the unloader and vacuum packed or sealed in a plastic bag to obtain the finished product. The above-mentioned granular sodium sulfide production process has reasonable design and advanced technology. Based on the unique physical properties of sodium sulfide concentrate, granulation process conditions and granulation equipment are provided, so that sodium sulfide products can be granulated, and vacuum packaging technology can be applied, effectively It effectively prevents the deliquescence and oxidation of sodium sulfide products, thereby extending the storage time. Granulated products can use automatic packaging systems to reduce labor intensity, improve the working environment, and reduce packaging costs.

Conveyor belt for sodium sulfide granulation [SY25049-0019-0004]

[Abstract] The utility model belongs to the molding technology of compounds, especially a conveyor belt used for sodium sulfide granulation. It is provided with a layer of fluoropolymer film on a metal base tape. After the sodium sulfide liquid drops onto the fluoropolymer membrane, it does not spread out, but shrinks into a hemispherical shape. After condensation, it becomes hemispherical particles, and can easily fall off the conveyor belt without any effort, thus solving the problem of sodium sulfide. The problem of not easily falling off the existing conveyor belt.

Sodium sulfide packaging process [FW25049-0003-0001]

[Abstract] The present invention is a sodium sulfide packaging process. $ This packaging process method eliminates the traditional iron drum packaging and uses plastic bags for sealed packaging. In order to adapt to the new packaging, during the evaporation and concentration process of sodium sulfide production, the concentrated sodium sulfide solution is injected into the iron mold. Immerse in the cooling pool for cooling, condense into a solid and then demould. The formed sodium sulfide solid is sealed and packaged in a plastic woven bag lined with a plastic bag. The advantage is that the process is simple, and the sodium sulfide is not easy to absorb moisture and deteriorate; it is small in size. It is light in weight, easy to load, unload, transport and use, and can improve warehouse utilization; saving steel can save 30 to 50% of packaging costs.