Process for preparing high-purity artificial fluorite by recovering fluoride-containing wastewater

Abstract

According to a process for preparing high-purity artificial fluorite by recovering fluoride-containing wastewater, a fluidized bed serves as a crystallization treatment device, fluoride components in wastewater are efficiently extracted in a supporter crystallization mode, a high-purity calcium fluoride artificial fluorite product is prepared, fluoride-containing wastewater can be treated to reach the standard, no secondary pollution exists, the problems of land occupation and environment pollution of bottom mud produced during treatment of industrial fluoride-containing wastewater are solved, fluoride resources in the bottom mud are effectively used, circulation is short, operation is simple, implementation is easy, fluoride pollution and fluoride resource waste are reduced, and process efficiency is high; good balance can be achieved between making emission not exceed the standard and controlling wastewater treatment cost. Produced calcium fluoride crystals are suitable for preparing artificial fluorite to serve as the substitute of natural fluorite, calcium fluoride crystals produced in the technological process are low in water content, fluoride-containing waste reducing or resourceful using aim is effectively achieved, and the process is an environment-friendly method for treating high-concentration fluoride-containing wastewater and is wide in industrial application prospects.

Description

technical field [0001] The invention relates to the preparation technology of C01F metal calcium compound in the IPC classification, belongs to the field of environmental engineering sewage treatment and resource recycling, and is a method for recycling fluorine-containing wastewater and sludge, especially the preparation of fluorine-containing wastewater nuclei crystallization. Pure artificial fluorite craft. Background technique [0002] Wastewater discharged from industries such as chemical industry, non-ferrous metallurgy, glass, electronics, electroplating, and photovoltaics often contains high concentrations of fluoride, causing fluorine pollution in the water environment. Research on fluorine-containing wastewater treatment technology has always been an important topic in the field of environmental protection at home and abroad. [0003] At present, there are mainly lime neutralization sedimentation method and coagulation sedimentation method in the treatment of fluor...

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Problems solved by technology

[0006] The resource utilization of fluorine-containing sludge is mainly realized by selling it as cement additives, paving materials and making unburned bricks, but this utilization method has the following problems: (1) The main substance in the sludge is fluorinated Calcium still has a certain solubility, and it is easy to pollute surface water, soil and groundwater through precipitation and surface runoff, causing secondary pollution, and there are certain safety hazards; (2) limited by the treatment process of fluorine-containing wastewater, such sludge particles are extremely It is easy to generate dust during temporary storage, transportation, and production, and these fluorine-containing dusts are easy to cause air pollution; (3) The output of sludge is far greater than the demand of the building materials industry. With the increase in freight costs in recent years, there will also be The phenomenon of long-term accumulation or random dumping of sludge will increase the pollution of soil and groundwater

[0015] Including the patent documents disclosed above, the traditional coagulation-sedimentation method has many shortcomings in the process of treating fluorine-containing wastewater to produce calcium fluoride, such as low purity of calcium fluoride sludge and crystals, small particle size, high process cost, and precipitation The sludge layer of the device has high water content, low calcium fluoride content, and many impurities. The operation of sludge-water separation is intensive, high operating costs and low treatment efficiency. The treated calcium fluoride bottom sludge can only be discharged outside to continue to cause environmental pollution, and cannot For the production of artificial fluorite products

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