Method for preparing nuclear power-grade high-purity boracic acid
A high-purity boric acid, nuclear power technology, applied in the direction of boron oxide compounds, etc., can solve the problems of unsatisfactory boric acid purity and excessive ionic impurity index, and achieve the effect of remarkable product performance, simple and easy-to-control process, and no environmental pollution.
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[0012] Example 1: Put rich B 10 Industrial boric acid is dissolved in a solvent, an oxidation assistant is added, reacted, filtered, evaporated and crystallized, and the crystals are dried below 70°C to obtain an intermediate product. Take 1000g of the above-mentioned intermediate product and mix with 5L of reactant, heat and stir for 1h, distill at 60℃, get the distillate and water in a volume ratio of 4:3, reaction temperature 55℃, evaporation and crystallization after 30min, crystallization temperature 50℃, centrifuge Separate the crystals and mother liquor, wash the crystals with water, and vacuum dry at 70°C to obtain a product with a purity of 99.9999%. The impurity content is: Fe 0.00004%, Ca 0.00005%, Na 0.00008%, Sb10 The content is 19.8%.
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[0013] Example 2: Dissolving common industrial boric acid in a solvent, adding two mixed oxidation assistants, reacting, filtering, evaporating and crystallization, drying the crystals below 70°C to obtain an intermediate product. Take 1000g of the above-mentioned intermediate product and mix with 6L of reactant, heat and stir for 2h, distill at 120℃ to obtain a mixture of distillate and water in a volume ratio of 1:1, reaction temperature 25℃, evaporation and crystallization after 60min, crystallization temperature 55℃, centrifuge Separate the crystals and mother liquor, wash the crystals with water, and vacuum dry at 100°C to obtain a product with a purity of 99.9999%. The impurity content is: Fe 0.00002%, Ca 0.00006%, Na 0.00009%, Sb 0.00001%, As 0.00001%, Pb 0.00002%, Si 0.00002%, other impurities are less than 0.000001%.
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