Method for producing calcium fluoride by utilizing high-fluorine-content industrial wastewater
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A technology for industrial wastewater and calcium fluoride, applied in chemical instruments and methods, metallurgical wastewater treatment, calcium/strontium/barium fluoride, etc., can solve the problem of high material consumption and energy consumption, high cost of fluorine-containing wastewater treatment, and secondary pollution and other problems, to achieve the effect of high fluorine recovery efficiency
Pending Publication Date: 2022-05-06
辽宁博创环保技术有限公司
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[0004] The object of the present invention is to provide a resource utilization method for producing calcium fluoride as steelmaking furnace protective slag by utilizing high fluorine-containing industrial wastewater. By adopting this method, the fluoride ion content in the discharged wastewater can be lower than 1.5 mg / L, and simultaneously produce The steelmaking furnace mold slag raw material with a calcium fluoride content of not less than 30% solves the problem that in the existing fluorine-containing wastewater treatment technology, the material consumption and energy consumption are large, the product cannot be recycled, and secondary pollution of different degrees is derived. Dealing with high cost issues
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Embodiment 1
[0024] A method for producing calcium fluoride by utilizing high fluorine-containing industrial waste water, comprising the following steps:
[0025] S1. Fluorine-containing waste water (fluoride ion concentration is 260mg / L) enters the 1# reaction tank, and calcium hydroxide is added to the 1# reaction tank, and the pH value is adjusted to 10, and stirred and mixed for 30 minutes; how much is the fluorine-containing waste water added? It doesn't matter, as long as the pH value is adjusted to 10 with calcium hydroxide;
[0026] S2. Introduce the upper layer waste water after the treatment of 1# reaction tank into 2# reaction tank, add calcium chloride in 2# reaction tank, adjust the chloride ion concentration to 400mg / L, stir for 30 minutes; as long as the chloride ion concentration is adjusted to 400mg / L L is enough;
[0027] S3. Introduce the upper-layer wastewater treated in the 2# reaction tank into the inclined plate settling tank, the supernatant of the inclined plate s...
Embodiment 2
[0034] A method for producing calcium fluoride by utilizing high fluorine-containing industrial waste water, comprising the following steps:
[0035] S1. Fluorine-containing waste water (fluorine ion concentration is 163mg / L) enters the 1# reaction tank, and calcium hydroxide is added to the 1# reaction tank, the pH value is adjusted to 9.3, and the mixture is stirred for 30 minutes;
[0036] S2. introduce the upper strata waste water after the 1# reaction tank treatment into the 2# reaction tank, add calcium chloride in the 2# reaction tank, adjust the chloride ion concentration to 320mg / L, and stir for 30 minutes;
[0037] S3. Introduce the upper-layer wastewater treated in the 2# reaction tank into the inclined plate settling tank, the supernatant of the inclined plate settling tank is introduced into the buffer tank, and the sludge produced in the inclined plate settling tank is discharged into the sludge thickening tank;
[0038] S4. Pump the wastewater from the buffer po...
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Abstract
The invention discloses a method for producing calcium fluoride by utilizing high-fluorine-content industrial wastewater, and belongs to the technical field of fluorine-containing wastewater treatment. The method comprises the following steps: introducing fluorine-containing wastewater into a 1 # reaction tank, adding calcium hydroxide to adjust the pH value to 9-11, stirring for 30 minutes, introducing upper-layer wastewater into a 2 # reaction tank, adding calcium chloride to adjust the chloride ion concentration to 300-400 mg/L, stirring for 30 minutes, introducing the upper-layer wastewater into an inclined plate sedimentation tank, introducing supernate of the inclined plate sedimentation tank into a buffer tank, and filtering to obtain the fluorine-containing wastewater. Sludge generated by the inclined plate sedimentation tank is discharged into a sludge concentration tank; pumping the sludge in the concentration tank into a solid-liquid separator to obtain a mixture solid product with the calcium fluoride content of 30-35% for recycling; and pumping the wastewater in the buffer pool into a precision filter, removing suspended matters in the wastewater, feeding the wastewater into a defluorination filtering tank filled with a special adsorption material, filtering the effluent with the fluoride concentration not higher than 1.5 mg/L, adjusting the pH value of the effluent to 6-9, and discharging the effluent. The problems that in an existing fluorine-containing wastewater treatment technology, material consumption and energy consumption are large, products cannot be recycled, and secondary pollution of different degrees is derived are solved.
Description
technical field [0001] The invention relates to a method for producing calcium fluoride by using high-fluorine-containing industrial waste water, in particular to a method for resource utilization of calcium fluoride used as steelmaking furnace mold slag by cooperating with the treatment of fluorine-containing waste water in the iron and steel industry. Background technique [0002] In recent years, the fluorine chemical industry is one of the fastest growing industries in the chemical industry. With the rapid development of the fluorine chemical industry, the discharge of fluorine-containing wastewater has brought threats to the ecological environment and has become the biggest obstacle to the sustainable development of the industry. Since most of the fluorine element in the treatment of fluorine-containing industrial wastewater eventually enters the sludge, the fluorine content of the sludge is high, and it is easy to cause secondary pollution during storage, transportation...
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