The theoretical composition of boric acid is boron oxide and water. It is a white crystal and can be made into particles or powders. These two forms are stable under general conditions, have fluidity, can be easily transported by air or machinery, and the solution is slightly acidic. The methods of producing boric acid can be divided into one-step and two-step according to different treatment methods. Let's follow Xiaobian to understand:
One step process is a process for preparing boric acid by directly treating boron bearing minerals with inorganic acid, including sulfuric acid method, hydrochloric acid method, nitric acid method, etc. At present, China's boric acid industry is mainly based on sulfuric acid method, and other methods are rarely used.
The two-step method is a method to prepare boric acid by treating industrial borax (borax decahydrate or borax pentahydrate) with sulfuric acid, hydrochloric acid and nitric acid. The sulfuric acid method is an earlier production process in China. In recent years, the nitric acid process of treating borax decahydrate and borax pentahydrate with nitric acid to produce boric acid and co producing sodium nitrate has developed rapidly, and has become an important two-step boric acid process in China.
The one-step process of treating boron bearing minerals with sulfuric acid as decomposition agent has the advantages of mature process, simple process, less equipment investment and easy operation. Therefore, people have been paying attention to it for a long time. However, there are also some problems that require high grade and are not suitable for processing low-grade boron ore.
Serious equipment corrosion; It has great limitations in product quality control and low boron yield. Lack of reliable utilization of mother liquor and great impact on the environment. The yield, quality and comprehensive utilization of mother liquor are the three major issues to be solved in this process.
Of course, keep it sealed. Boric acid was once used by people in the country as an insecticide to control cockroaches, termites, fire ants, fleas, bark beetles and other pests. Boric acid will affect their metabolism and corrode their exoskeletons. It can be made into baits containing attractants (sugar, etc.) to kill insects. Direct use of dry boric acid has the same effect.
Boric acid is also used for many purposes. For example, in the production of glass fiber, it can reduce the melting temperature to facilitate drawing. In general, B2O3 can reduce viscosity, control thermal expansion, prevent devitrification, improve chemical stability, and improve mechanical and thermal shock resistance. Boric acid is often mixed with sodium borates (such as borax pentahydrate or anhydrous borax) to adjust the ratio of sodium to boron in glass production requiring low sodium content.
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