A kind of preparation method of artificial fluorite ball
A fluorite ball, artificial technology, applied in the direction of calcium/strontium/barium halide, calcium/strontium/barium fluoride, etc., can solve the problem of not teaching the recovery of artificial fluorite from waste hydrofluoric acid, and save processing costs , The effect of reducing the cost of raw materials
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[0022] Such as figure 1 Shown, the preparation method of artificial fluorite ball of the present invention comprises the following steps:
[0023] a) using recovered hydrofluoric acid waste liquid 10 and calcium fluoride sludge 15 as raw materials;
[0024] Wherein, the hydrofluoric acid (HF) content of the hydrofluoric acid waste liquid 10 is greater than 2%; the calcium fluoride (CaF) of the calcium fluoride sludge 15 2 ) content is greater than 60%, and after recovery, it needs to be treated by screening out impurities and dirt.
[0025] b) Add excess calcium compound to the hydrofluoric acid waste liquid 10 in step a), and control the hydrofluoric acid waste liquid 10 to carry out calcification reaction under the condition of pH value between 6-13 for 0.5-2 hours, so that hydrofluoric acid Hydrofluoric acid in waste liquid 10 is converted into calcium fluoride deposit;
[0026] Among them, the added calcium compound is calcium hydroxide (Ca(OH) 2 ) or calcium chloride ...
Embodiment 1
[0037] Take hydrofluoric acid waste liquid with a hydrofluoric acid (HF) content of 5% as a raw material; add excessive calcium chloride and carry out calcification reaction under the condition of pH=8 for 1 hour, and then undergo solid-liquid separation for 0.5 hour to obtain A calcium fluoride mud cake with a solid content of 45%; then, drying at a temperature of 85°C for 1 hour to prepare a calcium fluoride precursor with a moisture content of less than 20% and a calcium fluoride content of 75%. After crushing and homogeneous grinding, add an appropriate amount of cementing plastic agent to obtain calcium fluoride powder with a particle size of 10mm, and then sinter at a temperature of 35°C at a low temperature to obtain artificial calcium fluoride with a calcium fluoride content of 75%. Fluorite ball.
Embodiment 2
[0039] Hydrofluoric acid waste liquid with a hydrofluoric acid (HF) content of 4% is used as the main raw material; calcium fluoride sludge with a calcium fluoride content of 65% is used as the secondary raw material. After recycling, impurities and dirt are screened out. object handling.
[0040] After adding excess calcium chloride to the hydrofluoric acid waste liquid and performing a calcification reaction under the condition of pH=10 for 1.5 hours, after 4 hours of solid-liquid separation treatment, a calcium fluoride mud cake with a solid content of 47% was obtained; then, Based on the weight of the calcium fluoride mud cake, mix in 50% calcium fluoride sludge that has been screened out of impurities, and after stirring, dry it at a temperature of 90°C for 1 hour to obtain a fluoride powder with a moisture content of less than 18%. Calcium Fluoride Precursor with Calcium Fe content up to 76%. After crushing and homogeneous grinding, add an appropriate amount of cementin...
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