Method for recovering fluorine resources from low-grade bauxite decomposition waste gas
A technology of bauxite and resources, which is applied in the field of comprehensive utilization of low-grade bauxite decomposition, can solve the problems of resource and energy consumption, achieve the effect of improving recovery rate, solving the shortage of fluorine resources, and good effect
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Embodiment 31
[0095] Stirring and kneading balls: take 20.000g of bauxite after acid leaching to remove iron, and the silicon content in it is 15.75%; grind the 20.000g of bauxite into 200 mesh particles, and then add 1 times the reaction ratio of fluoride Ammonium is mixed with a small amount of water, and then kneaded into a plurality of compact mixing balls, and the plurality of mixing balls are placed in an oven to keep warm and dry to remove the moisture therein, so as to form a plurality of mixed slag particles.
[0096] Roasting and desiliconization: then respectively place a plurality of the mixed slag particles in a fluidized bed reactor, and roast them for 3 hours at 500° C. After the reaction, 18.125 g of iron-removing bauxite products with a silicon content of 1.39% and Decomposition exhaust gas containing silicon fluoride gas, wherein the removal rate of silicon in the above-mentioned iron-removing bauxite is 92.00%.
[0097] Gas absorption ammonolysis: the gas product is passe...
Embodiment 32
[0100] The method for recovering fluorine resources provided in Example 3.2 is basically the same as the method for recovering fluorine resources provided in Example 3.1, the differences are as follows:
[0101] In the step of stirring and kneading the balls, ammonium fluoride with a reaction ratio of 1.2 times is added to the iron-removing bauxite;
[0102] In the step of roasting and desiliconization, the roasting reaction temperature is 700°C. After the roasting reaction is completed, 18.076 g of aluminum fluoride solid residue product with a silicon content of 3.98% and a gas product containing silicon fluoride gas are obtained, wherein the above-mentioned The removal rate of silicon in iron-removing bauxite is 77.16%;
[0103] In the step of gas absorption ammonolysis, the gas product is passed into the absorption tower at -4kPa, the gas product is hydrolyzed at 70°C, and the ammonolysis neutralizes the content of the ammonolysis tank pH is 7, and aged at 70°C for 1.5 ho...
Embodiment 33
[0106] The method for recovering fluorine resources provided in Example 3.3 is basically the same as the method for recovering fluorine resources provided in Example 3.1, the differences are as follows:
[0107] In the step of stirring and kneading the balls, ammonium fluoride with a reaction ratio of 1.2 times is added to the iron-removing bauxite;
[0108] In the step of roasting and desiliconization, the roasting time is 1h. After the roasting reaction is completed, 17.421g of aluminum fluoride solid residue product with a silicon content of 1.27% and a gas product containing silicon fluoride gas are obtained. The removal rate of silicon in bauxite is 92.98%, and the silicon content in the gaseous organism is 2.929g;
[0109] In the step of gas absorption ammonolysis, the gas product is passed into the absorption tower at -5kPa, the gas product is hydrolyzed at 80°C, and the ammonolysis neutralizes the content of the ammonolysis tank The pH was 8 and aged at 80°C for 2 hou...
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