Method for producing high-purity barium chloride with low strontium and high-purity barium chloride with low strontium

摘要

The present invention provides a method for producing high-purity barium chloride with low strontium and high-purity barium chloride with low strontium. The method comprises following processes: reacting: adding barium carbonate and hydrochloric acid into acid-resistant reactor under agitation to carry out reaction, keeping temperature at 55-60°C, controlling the reaction so as to make pH value of reaction solution at endpoin in a range of 3.5-4.0, after completing reaction, separating solid from liquid to obtain clear filtration containing barium chloride as liquid phase; adjusting process by excess acid: adding the clear filtration containing barium chloride obtained by separation into acid-resistant reactor, adding hydrochloric acid slowly under agitation, controlling [H+] at 2.0-6.0mol/L, cooling the solution until the temperature of the solution is lower than 35°C, then separating solid from liquid, obtaining barium chloride crystal as solid phase; dissolving and removing impurities: dissolving the obtained barium chloride crystal with water to prepare saturated solution at a temperature of 80-90°C, adding hydrogen peroxide, heating the solution to slightly boil, then neutralizing the solution with barium hydroxide to pH 7.0-7.5, separating solid from liquid, obtaining barium chloride-containing solution as liquid phase; and separating and drying: transferring the obtained liquid phase into cooling crystallizer, cooling slowly to 38-42°C, then separating solid from liquid, and drying the obtained solid to obtain the barium chloride product. The purity of high-purity barium chloride with low strontium obtained by the method is equal to 99.60% or more, and Sr content is lower than 10ppm.