1、气相碳化法

1. Gas phase carbonization method

将碳酸钠溶液，在碳化塔中通过二氧化碳碳化后，再经分离、干燥、粉碎，即得成品。

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、气固相碳化法

2. Gas-solid carbonization method

将碳酸钠置于反应床上，并用水拌好，由下部吸入二氧化碳，碳化后经干燥、粉碎，即得成品。

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、废碱液回收法

3. Waste alkali recovery method

在纯碱生产过程中，纯碱煅烧炉产生的炉气，经旋风分离后，仍含有较多的碱粉。将此炉气用热碱回收，使碱粉溶解在碱液内，在循环溶解过程中，部分碱液送往蒸氨塔，蒸出热碱液中氨，使碱液进一步浓缩，作为生产小苏打的碱液原料，蒸氨塔顶出来的氨、二氧化碳和水混合气，进入原来炉气冷却塔。小苏打生产中分离脱水后的母液，用于热碱液循环，以溶解回收炉气中碱粉，构成生产过程循环。

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.

废碱液回收后，经碳化、离心分离、干燥，制得碳酸氢钠成品。

After the waste alkali solution is recovered, it is carbonized, centrifuged, and dried to obtain a finished product of sodium bicarbonate.

4、天然碱加工法

4. Natural alkali processing method

以天然碱为原料，由于杂质含量较高，因而碱液配制时，需严格控制化碱温度、浓度及母液循环次数，母液中总盐量应大于240g/L。化碱后碱液浓度碳酸钠大于150g/L、氯化钠小于50g/L、硫酸钠小于90g/L，所得碱液经过滤除渣，然后与二氧化碳碳化生成碳酸氢钠结晶，经洗涤脱水，洗液可返回化碱或排放，结晶经干燥，制得碳酸氢钠成品。

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.

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