A method for preparing calcium fluoride from lime calcined residue
A calcium fluoride, calcining technology, applied in the direction of calcium/strontium/barium fluoride, ammonium chloride, silicon oxide, etc., can solve the problem of high impurity content in the final product of calcium fluoride, difficult to control the purity of calcium oxide, and difficult to control the reaction process and other problems, to achieve the effect of comprehensive utilization of waste residue, easy control of the reaction process and high production efficiency
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Embodiment 1
[0029] A method for preparing calcium fluoride by utilizing lime calcined residue, comprising the following steps:
[0030] 1) First add 30% fluosilicic acid solution into the reaction tank, and then add ammonia water with a mass fraction of 17% while stirring at a stirring speed of 20r / min. The speed of adding ammonia water is 20L / min. React for 1 hour at 50°C, where the molar ratio of ammonia water to fluorosilicic acid is 4.2;
[0031] 2) Pass the slurry obtained in step 1) into the filter tank, vacuum filter, the filter cake is a solid mixture of fluorosilicate, and the filtrate enters the fluorosilicate absorption device, and continues to recover fluorosilicate;
[0032] 3) Put the fluorosilicate solid mixture obtained in step 2) into the reaction kettle, add ammonia water with a mass fraction of 9%, stir while adding, the stirring speed is 40r / min, react for 1h, and wait until the pH of the slurry reaches 7.0, end the reaction, wherein the molar ratio of fluorosilicate ...
Embodiment 2
[0041] A method for preparing calcium fluoride by utilizing lime calcined residue, comprising the following steps:
[0042] 1) First add 30% fluosilicic acid solution into the reaction tank, and then add ammonia water with a mass fraction of 17% while stirring at a stirring speed of 20r / min. The speed of adding ammonia water is 20L / min. React for 1 hour at 50°C, where the molar ratio of ammonia water to fluorosilicic acid is 4.2;
[0043] 2) Pass the slurry obtained in step 1) into the filter tank, vacuum filter, the filter cake is a solid mixture of fluorosilicate, and the filtrate enters the fluorosilicate absorption device, and continues to recover fluorosilicate;
[0044] 3) Put the fluorosilicate solid mixture obtained in step 2) into the reaction kettle, add ammonia water with a mass fraction of 9%, stir while adding, the stirring speed is 40r / min, react for 1h, and wait until the pH of the slurry reaches 7.0, end the reaction, wherein the molar ratio of fluorosilicate ...
Embodiment 3
[0053] A method for preparing calcium fluoride by utilizing lime calcined residue, comprising the following steps:
[0054] 1) First add 30% fluosilicic acid solution into the reaction tank, and then add ammonia water with a mass fraction of 25% while stirring at a stirring speed of 30r / min. The speed of adding ammonia water is 30L / min. Reaction at 60°C for 2 hours, wherein the molar ratio of ammonia water to fluorosilicic acid is 5.0;
[0055] 2) Pass the slurry obtained in step 1) into the filter tank, vacuum filter, the filter cake is a solid mixture of fluorosilicate, and the filtrate enters the fluorosilicate absorption device, and continues to recover fluorosilicate;
[0056] 3) Put the fluorosilicate solid mixture obtained in step 2) into the reaction kettle, add ammonia water with a mass fraction of 10%, stir while adding, the stirring speed is 60r / min, and react for 2h, until the pH of the slurry reaches 7.5, end the reaction, wherein the molar ratio of fluorosilicat...
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Abstract
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