1、氣相碳化法

1. Gas phase carbonization method

將碳酸鈉溶液，在碳化塔中通過二氧化碳碳化后，再經(jīng)分離、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、氣固相碳化法

2. Gas-solid carbonization method

將碳酸鈉置于反應床上，并用水拌好，由下部吸入二氧化碳，碳化后經(jīng)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、廢堿液回收法

3. Waste alkali recovery method

在純堿生產(chǎn)過程中，純堿煅燒爐產(chǎn)生的爐氣，經(jīng)旋風分離后，仍含有較多的堿粉。將此爐氣用熱堿回收，使堿粉溶解在堿液內(nèi)，在循環(huán)溶解過程中，部分堿液送往蒸氨塔，蒸出熱堿液中氨，使堿液進一步濃縮，作為生產(chǎn)小蘇打的堿液原料，蒸氨塔頂出來的氨、二氧化碳和水混合氣，進入原來爐氣冷卻塔。小蘇打生產(chǎn)中分離脫水后的母液，用于熱堿液循環(huán)，以溶解回收爐氣中堿粉，構成生產(chǎn)過程循環(huán)。

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.

廢堿液回收后，經(jīng)碳化、離心分離、干燥，制得碳酸氫鈉成品。

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

4、天然堿加工法

4. Natural alkali processing method

以天然堿為原料，由于雜質(zhì)含量較高，因而堿液配制時，需嚴格控制化堿溫度、濃度及母液循環(huán)次數(shù)，母液中總鹽量應大于240g/L。化堿后堿液濃度碳酸鈉大于150g/L、氯化鈉小于50g/L、硫酸鈉小于90g/L，所得堿液經(jīng)過濾除渣，然后與二氧化碳碳化生成碳酸氫鈉結晶，經(jīng)洗滌脫水，洗液可返回化堿或排放，結晶經(jīng)干燥，制得碳酸氫鈉成品。

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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