Preparation method for high-purity boric acid and nuclear-grade high-purity boric acid
A high-purity boric acid and boric acid technology, applied in the direction of boron oxide compounds, can solve problems such as unfavorable nuclear power industry development, high product cost, environmental impact, etc., and achieve the effect of solving technical problems, easy operation, and thorough removal of heavy metals
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Embodiment 1
[0033] Example 1 The preparation method of high-purity boric acid
[0034]The process steps include: 1) leaching industrial boric acid with water to remove part of the calcium, magnesium, and sodium impurities to obtain a high-purity boric acid precursor; 2) dissolving the high-purity boric acid precursor in pure water at a temperature of 80°C to 90°C , made containing H 3 BO 3 180g / L~220g / L boric acid solution, after deep removal of iron and heavy metals with composite additives, then filtered, cooled and crystallized, solid-liquid separation, washed, and dried to obtain high-purity boric acid products.
[0035] The composite additive is a combination of sulfide and ammonia water, which are used after pulping.
[0036] The sulfide is any one of ammonium sulfide, barium sulfide, strontium sulfide, potassium sulfide and sodium sulfide, and its dosage is 15 to 30 times the stoichiometric amount.
[0037] The volume ratio concentration of the ammonia water is 5%, and its co...
Embodiment 2
[0044] Example 2 Preparation method of nuclear-grade high-purity boric acid
[0045] Firstly, the undried high-purity boric acid obtained in Example 1 was dissolved in pure water at a temperature of 80°C to 90°C to prepare H-containing boric acid 3 BO 3 180g / L~220g / L boric acid solution, then add ammonium nitrate at 2.5~3.5g / L into the solution, heat-preserve and filter, cool and crystallize under stirring conditions to a final temperature of 10℃~20℃, and then separate solid and liquid; Recrystallize in this way for 1-2 times, dry and pack to get the product.
Embodiment 3
[0046] Example 3 The preparation method of high-purity boric acid
[0047] The process steps include: 1) leaching industrial boric acid with water to remove part of the calcium, magnesium, and sodium impurities to obtain a high-purity boric acid precursor; 2) dissolving the high-purity boric acid precursor in pure water at a temperature of 80°C to 90°C , made containing H 3 BO 3 240-280g / L boric acid solution, after deep iron removal and heavy metal removal with compound additives, is then filtered, cooled and crystallized, solid-liquid separation, washed, and dried to obtain high-purity boric acid products.
[0048] The composite additive is a combination of sulfide and ammonia water, which are used after pulping.
[0049] The sulfide is a combination of any two of ammonium sulfide, barium sulfide, strontium sulfide, potassium sulfide and sodium sulfide, and its dosage is 10 to 15 times the stoichiometric amount.
[0050] The volume ratio concentration of the ammonia w...
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