How does sodium nitrate evaporative crystallization control the crystallization process? Sodium nitrate is quite used, in the evaporation of crystallization may appear when the particle size is uneven and other issues, the following small series focus on how to control the crystallization process of sodium nitrate evaporation crystallization.
Sodium nitrate is mainly produced by nitrate extraction, and the general sodium nitrate process route can be summarized into two types: one is that after the ore is leached, the brine is heated and evaporated, and the sodium chloride and sodium sulfate are separated by filtration, and then cooled and crystallized to produce sodium nitrate.
The other is the sun evaporation process, that is, the ore is crushed, leached, the brine is sent to the salt pan for solar evaporation, and the crude salt obtained after separation is sent to the finishing workshop to produce sodium nitrate.
The two sodium nitrate evaporative crystallization processes mentioned above have high energy consumption, high production costs and low product quality; the latter make full use of solar energy and are conducive to the development and utilization of low-grade ore.
Xiaobian believes that in the production of sodium nitrate, it is possible to consider controlling the crystallizer during the crystallization process, so that the crystal size of the product sodium nitrate is increased and evenly distributed.
The crude salt is dissolved in water, at high temperature (75 ° C), solid-liquid separation, waste salt is discharged, the liquid phase continuously enters the DTB crystallizer for cooling, and sodium nitrate is continuously precipitated, and the finer crystals of sodium nitrate are formed in the crystallizer with the flow of liquid to form an internal cycle, and grow in the crystalline area, when the crystallization grows to the point that the stirring can not be lifted to form a cycle, it settles to the bottom of the crystallizer, and the release is the sodium nitrate product, the overflow liquid, the product filtrate and the washing water return to the crude salt to dissolve.
The process of separating impurities in sodium nitrate by thermal dissolution is effective and stable, and the control crystallizer is adopted in the crystallization process, which improves the crystallization form of sodium nitrate, and the product crystallization particles are large and uniform.
Sodium nitrate evaporative crystallization controls its dissolution temperature and dissolution time, and the dissolution ratio can obtain a product with uniform grain size.
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