1. Gas phase carbonization method
The sodium carbonate solution is carbonized by carbon dioxide in a carbonization tower, and then separated, dried, and crushed to obtain the finished product.
2. Gas-solid carbonization method
Place sodium carbonate on a reaction bed, mix it with water, inhale carbon dioxide from the bottom, carbonize it, and then dry and crush it to obtain the finished product.
3. Waste alkali recovery method
In the production process of soda ash, the furnace gas generated by the calciner still contains a large amount of alkali powder after cyclone separation. The gas from this furnace is recovered with hot alkali to dissolve the alkali powder in the alkali solution. During the circulating dissolution process, some of the alkali solution is sent to the ammonia distillation tower to evaporate the ammonia in the hot alkali solution, further concentrating the alkali solution. As the alkali solution raw material for producing baking soda, the mixed gas of ammonia, carbon dioxide, and water from the top of the ammonia distillation tower enters the original furnace gas cooling tower. The mother liquor after separation and dehydration in the production of baking soda is used for hot alkali liquor circulation to dissolve and recover alkali powder in the furnace gas, forming a production process cycle.
After the waste alkali solution is recovered, it is carbonized, centrifuged, and dried to obtain a finished product of sodium bicarbonate.
4. Natural alkali processing method
Using natural alkali as the raw material, due to the high impurity content, strict control of alkali temperature, concentration, and mother liquor circulation times is required when preparing the alkali liquor. The total salt content in the mother liquor should be greater than 240g/L. After alkalization, the concentration of the alkaline solution is greater than 150g/L of sodium carbonate, less than 50g/L of sodium chloride, and less than 90g/L of sodium sulfate. The obtained alkaline solution is filtered and slag is removed, and then carbonized with carbon dioxide to form sodium bicarbonate crystals. After washing and dehydration, the washing solution can be returned to alkalization or discharged, and the crystals are dried to produce sodium bicarbonate finished products.
That's all for the explanation of the industrial preparation methods of sodium bicarbonate. I hope you can be helpful. For more information, please come to our website http://www.jinhao360.com Consult!