Barium metaphosphorate production process

Abstract

The invention discloses a manufacturing technology of barium metaphosphate, which comprises the following steps: putting barium hydroxide in the container; adding the deionized water and active carbon to stir and heat with 1.05-1.10 specific gravity until the barium hydroxide is dissolved completely; stewing; filtering; obtaining fine barium hydroxide with iron, bronze, nickel, manganese and cobalt less than 0.0003 percent; putting the barium hydroxide in another container to stir and add high-quality phosphate; adjusting the pH value at 9-11 to obtain the deposition of barium hydrophosphate; adding the deionized water to dilute; obtaining the mixing paste of barium hydrophosphate; drying and condensing into barium metaphosphate by centrifugal spray. The technology is easy to adjust and control, whose production impurity content is low and recovery rate is high.

Description

technical field

[0001] The invention relates to a production process of barium metaphosphate, in particular to a production process of barium metaphosphate with low impurity content for flame retardant and phosphate optical glass additive. Background technique

[0002] At present, the production method of barium metaphosphate is mainly to use the mixture of barium hydrogen phosphate and barium carbonate to calcinate at high temperature for 15 hours to make barium metaphosphate. Another method is to react barium peroxide with phosphoric acid to generate barium phosphate precipitate, and heat the barium phosphate precipitate to convert it into barium metaphosphate. The common defects of these two methods are that the production cost is high, the yield is unstable, there are intermediates in the product, the product quality is unstable, and the production process is complicated. Contents of the invention

[0003] The object of the present invention is to provide a kind of pr...