Method of using low-grade witherite to produce high-purity barium chloride
A production method, the technology of barium chloride, applied in the direction of calcium/strontium/barium chloride, calcium/strontium/barium halide, etc., can solve the problem of not being able to directly produce high-purity barium chloride, and achieve low refining cost and excellent process The effect of short process and low equipment investment
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Embodiment 1
[0027] 1.8Kg of low-grade witherite ore powder (including BaCO 3 The content is 60wt%, CaCO 3 content of 15wt%) into the reaction vessel, add 15wt% hydrochloric acid under the condition of stirring for acidolysis reaction, control the reaction temperature to 45°C, control the pH value of the end of the reaction to be 2~3, until there is no CO 2 Until the bubbles escape, add lime milk to adjust the alkalinity [OHˉ] to 0.4g / L, maintain the alkalinity and temperature and stir for 5 hours, filter it carefully, add 15wt% hydrochloric acid to the filtrate to adjust the pH value to 7, and transfer it to the evaporator Evaporate under medium heating, and when crystallization occurs on the liquid surface, stop heating, cool naturally to 25°C, separate with a centrifuge, take 60mL of centrifuged residue and spray to wash the solid. Wet barium chloride was washed with 700 mL of saturated barium chloride aqueous solution, stirred and washed for 15 minutes, then centrifuged to separate, a...
Embodiment 2
[0029] 180Kg of low-grade witherite ore powder (including BaCO 3 The content is 55wt%, CaCO 3 content of 17wt%) into the reaction vessel, under the condition of stirring, add 3wt% hydrochloric acid for acid hydrolysis reaction, control the reaction temperature to 50°C, control the pH value of the end of the reaction to be 2~3, until there is no CO 2 Until the bubbles escape, add lime milk to adjust the alkalinity [OHˉ] to 0.5g / L, maintain the alkalinity and temperature and stir for 5 hours, filter it carefully, add 15wt% hydrochloric acid to the filtrate to adjust the pH value to 8, and transfer it to the evaporator Evaporate under medium heating, and when crystallization occurs on the liquid surface, stop heating, cool naturally to 30°C, separate with a centrifuge, take 5L of centrifuged residue and spray to wash the solid. Wet barium chloride was washed with 50 L of saturated barium chloride aqueous solution, stirred and washed for 20 minutes, then separated by centrifuge, ...
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