Why does flake alkali crystallize
The main component of soap is fatty acid sodium salt, which is usually saponified from oil and caustic soda. In addition to fatty acid salts, soap made from flaky alkali also contains a lot of fillers such as rosin, water glass, spices, and dyes. From a planning point of view, fatty acid sodium molecules contain non-polar hydrophobic groups (alkyl groups) and flake-based polar hydrophilic groups (carboxyl groups). The hydrophobic group has a lipophilic effect. In the metallurgical industry, in order to remove insoluble impurities, flake caustic soda is often used to convert the usable components in the ore into soluble sodium salt. Therefore, caustic soda is often used (the flake caustic soda is also a flux), and sometimes caustic soda is also used.
At present, caustic soda has been widely used in light industry, dyes, rubber, chemical and other fields. Although it is widely used, it may encounter some minor problems when using it. For example, crystallization will affect our use. Let's take a look at the cause of the crystallization problem
1. Flaky alkali absorbs moisture and crystals
The flake caustic soda is packed in double bags. If the sewing of the bag is not fast enough and the sewing is not tight, the products in the bag will easily absorb moisture and affect the quality. Therefore, the original single seam is changed to double seam, and the packer is required to check the entrainment and suture process, so as to achieve a certain degree of separation from the air, which greatly reduces the crystallization problem.
2. The influence of flake alkali on temperature
The temperature of the flake caustic soda is determined by the drum cooling water flow and the drum speed of the flake caustic soda machine. The temperature of the circulating water in the drum of the flake caustic soda machine, whether the nozzles in the drum are blocked, and whether the drum is scaled directly affect the temperature of the flake caustic soda and the uniformity of the machine feed temperature. After cleaning the nozzle and the scale circulating water in the barrel, the temperature of the flake caustic soda drops from 63°C or 66°C to 58°C. Decreasing the temperature of flake caustic soda can reduce crystallization.
Therefore, if we encounter this problem again, we can find some reasons and know the correct treatment according to the above introduction. In addition, the crystallization of flake caustic has no direct relationship with quality, but if crystallization occurs, it will affect our use, so we must pay more attention.