Preparation method of high-purity boric acid

Abstract

The invention provides a preparation method of high-purity boric acid. The preparation method comprises the following steps: putting industrial boric acid into a mixed solution of circulating mother liquor and trace inorganic acid, stirring, and heating for dissolution; performing thermal reaction for 1-2 hours in a temperature range of 80-95 DEG C; cooling to obtain wet boric acid crystals; respectively washing the crystals by virtue of mother liquor alternately purified by a cation exchange resin column and an anion exchange resin column; and drying to prepare high-purity boric acid. Compared with the prior art, the technical scheme provided by the invention has the technical advantages of being simple in process flow, having no environmental pollution, being high in crystal purity and low in manufacturing cost, selecting between granular or lamellar crystals, and the like; moreover, the crystal particle size distribution can be greatly improved.

Description

technical field [0001] The application of the present invention relates to the purification process of industrial grade boric acid. Background technique [0002] Industrial boric acid is an industrial grade product obtained by performing sulfuric acid method, hydrochloric acid method, carbon ammonia method, nitric acid method and other processing methods on boron-containing minerals, and finally crystallized in aqueous solution, in which boric acid content is more than 95%. Boric acid is widely used in glass manufacturing, enamel, electronics industry, medicine, metallurgy, military industry, chemical reagents, nuclear power industry and aerospace and other fields. With the development of modern industry, the application fields of boric acid are constantly expanding, and the requirements for its product performance and quality are also gradually improving, and there have been researches on refining and purifying boric acid and related industries. [0003] Due to different m...

AI Technical Summary

Problems solved by technology

[0005] The existing industrial boric acid purification methods have many technical deficiencies, including long process flow, high production cost, unsatisfactory product purity, etc. These purification preparation methods all use filtration to filter out impurities, but in actual operation, filtration needs to be It is carried out under high temperature conditions to prevent boric acid crystallization. The filtration process takes a long time and will increase the loss of raw materials. There is heat loss in the process, and the filtration effect of the filtration method is also limited, and the fine impurities in the solution will still pass through the filter. These fine impurity particles remain in the product, which also affects the purity of boric acid; the first and third schemes use additional materials, which will introduce more complex impurities, and the second scheme is finally obtained by cooling in a constant temperature bath. Crystals increase cost consumption; each preparation process also produces a large amount of waste that cannot be reused and is difficult to handle

The existing boric acid refining treatment methods are difficult to avoid the above-mentioned problems

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