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[Chemical Knowledge]：The production process and preparation method of soda ash.

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Soda ash, also known as caustic soda, is an important chemical raw material, widely used in textile, papermaking, metallurgy, medicine and other fields. The production process and preparation method of soda ash is one of the core competitiveness of soda ash manufacturing enterprises. Let's take a closer look at the production process and preparation method of soda ash.

1. Traditional soda ash preparation process

The traditional soda ash preparation process uses a co-firing method of sodium carbonate and sodium oxide. The specific process is as follows:

① Raw material preparation: soda ash raw materials (such as natural alkali stone or seawater excavated from mines) are purified to obtain sodium carbonate and sodium oxide with high purity.

② Mixing and drying: After mixing sodium carbonate and sodium oxide in a certain proportion, the water is removed and the calorific value of the raw materials is increased by drying.

③ Co-firing: Put the mixed and dried raw materials into the furnace, control the reaction temperature, atmosphere and fuel and other parameters, so that sodium carbonate and sodium oxide are co-fired at high temperature to generate soda ash, and the soda ash is cooled and separated by pressurized spraying.

④ Separation and filtration: The sodium carbonate, sodium oxide and soda ash produced in the furnace are separated, filtered and washed to obtain the final product.

2. modern soda ash preparation process

modern soda ash preparation process relative to the traditional process, more energy saving and environmental protection and efficient. Commonly used modern soda preparation process has the following.

(1) Biological Carbon Capture Process

The biological carbon capture process is a technology that captures carbon dioxide (CO2) from gas. The process mainly uses some microorganisms (such as Calvi bacteria) to convert CO2 into carbonate, and then prepare soda ash. The biological carbon capture process can not only convert CO2 into useful substances, but also greatly reduce CO2 emissions, so it has a very high environmental value.

(2) Sodium chloride co-firing process

Sodium chloride co-firing process is a process in which sodium chloride and sodium oxide of minerals are co-fired to prepare soda ash. Compared with the traditional sodium carbonate-sodium oxide process, the sodium chloride co-firing process has the advantages of low energy consumption and high product purity, and can also greatly reduce the emission of harmful gases such as SOx and NOx.

(3) solution evaporation process