Process of preparing filter material for reducing fluoride content and improving water quality

A preparation process and filter material technology, which are applied in the field of filter material preparation technology for reducing fluoride and changing water, can solve the problems of difficulty in effectively achieving the purpose of reducing fluoride and changing water, high process cost, unsatisfactory effect, etc., and are convenient for popularization, application and processing. Simple process, obvious effect

Inactive Publication Date: 2007-12-19
山东乾天工贸有限公司 +1
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AI-Extracted Technical Summary

Problems solved by technology

[0013] The purpose of the present invention is to solve the problems of high cost of filter materials and processes for reducing fluoride and improving water, unsatisfactory effect, and difficulty in effectively achieving the purpose of reducing fluoride and impro...
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Method used

(2) raw material after pulverizing is carried out high-temperature roasting, and its temperature is 900-1000 ℃, and the time is 3-4 hours, preferably temperature is 950 ℃, and the time is 3 hours; To the selected natural zeolite raw material The purpose of high-temperature roasting is to remove the organic substances in the pores and channels of the zeolite, and the roasting conditions and time are controlled to maximize the adsorption capacity of the zeolite to water after roasting.
(3) putting into the hydrochloric acid that concentration is 30% after roasting is cooled 18-24 hours, carry out acid treatment...
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Abstract

The present invention is process of preparing filter material for reducing fluoride content and improving water quality, and the filter material has the advantages of simple preparation process, simple use, low cost, high fluoride content reducing effect and other advantages. The process includes the following steps: sorting natural zeolite material and crushing to 5-8 mesh; high temperature roasting at 900-1000 deg.c for 3-4 hr; cooling and treating in 30 % concentration hydrochloric acid for 18-24 hr; washing and soaking in inorganic salt solution for 12-24 hr; flushing and soaking in sodium health solution for 10-30 hr; flushing and soaking in 1-5 % concentration alum solution for 10-16 hr to activate; acid-alkali balancing; drying and water maintaining treatment to obtain the product.

Application Domain

Other chemical processesAluminium silicates +1

Technology Topic

Inorganic saltsFilter material +11

Examples

  • Experimental program(1)

Example Embodiment

[0041] In the following, the present invention will be further described in conjunction with the embodiments.
[0042] A process for preparing a filter material for reducing fluoride to water. Its steps are:
[0043] (1) It uses natural zeolite as raw material, and after selection, it is crushed to 5-8 mesh;
[0044] (2) The crushed raw materials are roasted at a high temperature, the temperature is 900-1000°C, and the time is 3-4 hours, preferably at 950°C, and the time is 3 hours; the selected natural zeolite raw materials are roasted at high temperature , Its purpose is to remove organic substances in the pores and channels of the zeolite, and to control the roasting conditions and time to maximize the adsorption capacity of the zeolite for water after roasting.
[0045] (3) After the roasted material is cooled, put it in 30% hydrochloric acid for 18-24 hours, and carry out acid treatment, preferably 20 hours; it achieves the following purpose: remove the SiO from the pores and channels of the zeolite 2 , Fe 2 O 3 And organic substances, so that the holes and channels can be dredged; H with a small radius+ Replace cations with large radius, such as Ca 2+ , Ma 2+ , Na + Etc., broaden the effective space of the pores; increase the adsorption of active centers.
[0046] (4) After rinsing the acid-treated material, mix it with inorganic salt according to the ratio of 1:0.03-0.05 and soak for 12-24 hours for salt treatment, preferably for 18 hours; salt treatment for zeolite to make Replacement of Ca in zeolite by monovalent cations of inorganic salts 2+ , Ma 2+ Wait.
[0047] (5) Rinse the salt-treated material and mix it with 2-10% sodium hydroxide solution in a ratio of 1:0.02-1 and soak for 10-30 hours, and then perform alkali treatment, preferably for 24 hours; Alkali treatment adjusts the pore structure of the zeolite and increases the active specific surface area, which can better adsorb the aluminum salt and its hydrolysate and become a good carrier for the aluminum salt. Via F - With Al 3+ The stable coordination effect can effectively adsorb and remove fluoride ions in water.
[0048] (6) After the treated materials are rinsed, they are placed in 1-5% alum solution for 10-16 hours for activation, preferably for 14 hours, to further improve and stabilize the activity of the modified zeolite;
[0049] (7) Perform acid-base balance on the activated materials;
[0050] (8) Dry the materials;
[0051] (9) The finished product can be obtained by water retention treatment.

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