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Rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water and preparation and use method

A technology of turbid ring water and defluorinating agent, which is applied in the field of water treatment, can solve the problems of high fluoride ion content, and achieve the effect of simple process, strong operability and easy realization

Inactive Publication Date: 2019-10-08
鞍钢栗田(鞍山)水处理有限公司
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  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Using it as a trapping agent, combined with a rapid adsorption and sedimentation agent to solve the problem of high fluoride ion content in steelmaking turbid ring water

Method used

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  • Rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water and preparation and use method
  • Rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water and preparation and use method
  • Rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water and preparation and use method

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preparation example Construction

[0043] See figure 1 , the preparation method of the rapid sedimentation defluorination agent of processing fluorine-containing turbid ring water in steelmaking, the preparation method of polymerized aluminum iron silicate-carboxymethyl starch sodium in the described rapid adsorption sedimentation agent comprises the following steps:

[0044] 1) Prepare 0.15-0.25mol / L sodium silicate aqueous solution, take 3-6 parts of sodium silicate aqueous solution and use phosphoric acid with a mass concentration of 10%-15% to adjust the pH to 1.8-2.5, stir at 30-40°C for 2 -3 hours, after standing and aging for 24 hours to obtain polysilicate; then add 0.3-0.45mol / L Al 2 (SO 4 ) 3 2-4 parts of aqueous solution and 0.15-0.3mol / L Fe 2 (SO 4 ) 3 0.5-2 parts of aqueous solution, making n Al:Fe=3:1, n(Al+Fe):SiO 2 =1:1 (n is the ratio of the amount of substances), stir evenly, and obtain polyaluminum iron silicate after aging for 2-4 hours;

[0045] 2) After gelatinizing sodium carboxyme...

Embodiment 1

[0067] The test was carried out with a system of water samples from a steelmaking plant. The water quality analysis is shown in Table 2:

[0068] Table 2: Water sample index of embodiment 1

[0069]

[0070] Implement according to the treatment plan a, subject to the treatment of 1L fluorine-containing water sample, introduce 0.64L of reverse osmosis concentrated water (calcium ion concentration 560mg / L), react for 20-30 minutes and then add a rapid adsorption sedimentation agent at 71.7mg / L, Stir for 10-20 seconds, stand still for 15 minutes, then measure the fluoride ion concentration in the supernatant, which is 9.9 mg / L.

Embodiment 2

[0072] The test was carried out with a system of water samples from a steelmaking plant, and the water quality analysis is shown in Table 3:

[0073] Table 3: Water sample index of embodiment 2

[0074]

[0075] Implement according to the treatment plan b, subject to the treatment of 1L fluorine-containing water sample, introduce 0.15L of reverse osmosis concentrated water (calcium ion concentration 560mg / L), react for 20-30 minutes and then add a rapid adsorption sedimentation agent at 17.3mg / L, Stir for 10-20 seconds, and after standing for 15 minutes, measure the fluoride ion concentration in the supernatant, which is 8.1 mg / L.

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Abstract

The invention provides a rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water and a preparation and use method. The rapid sedimentation defluorination agent for treating steel-making fluorine-containing turbid circulating water uses reverse osmosis concentrated water as a trapping agent to trap fluoride ions in water to form calcium fluoride precipitate, and then calcium fluoride in the water is removed by adsorption of a rapid adsorption sedimentation agent, and finally the defluorination work is completed. By means of characteristicsof high salt, high calcium and high magnesium of the reverse osmosis concentrated water, waste is turned into treasure. The reverse osmosis concentrated water is used as the trapping agent, and the problem of high fluoride ion content in the steel-making turbid circulating water is solved by combining with the rapid adsorption sedimentation agent. On the one hand, the problem of excessive fluorine content in steel-making wastewater is solved, and the purpose of reducing hardness of reverse osmosis concentrated water is achieved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a rapid sedimentation defluorination agent for treating fluorine-containing turbid ring water in steelmaking, and a preparation and use method thereof. Background technique [0002] With the rapid development of fluorine-related industries in recent years, the total discharge of fluorine-containing wastewater in my country has increased sharply every year, making the problem of fluorine pollution increasingly serious. In the iron and steel industry, some processes need to use fluorite as raw material for production, resulting in some fluorine ions entering the circulating water system of the iron and steel plant. The effective treatment and reasonable utilization of fluorine-containing industrial circulating water will improve the utilization rate of water resources, promote energy conservation and emission reduction projects in steel plants, and benefit the safety of the...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/14C02F103/16
CPCC02F9/00C02F2001/007C02F1/441C02F1/285C02F1/545C02F2101/14C02F2103/16
Inventor 胡文军张柏鸿孙辉李红张宇张冲王坤鹏李俊峰
Owner 鞍钢栗田(鞍山)水处理有限公司
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