Technological method for preparing hydroxyapatite by using phosphating waste water as raw material

A technology of hydroxyapatite and process methods, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of large output of phosphating wastewater process sludge and high treatment costs, and achieve good economic and social benefits, Effects of reducing pollution and saving phosphorus resources

Inactive Publication Date: 2017-04-26
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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Problems solved by technology

[0007] Aiming at the problems of large sludge output and high treatment cost in the existing precipitation method for treating phosphating wastewater, the present invention provides a novel phosphating wastewater treatment method, that is, hydroxyapatite is prepared from high-concentration phosphating wastewater, which not only It can reduce the sludge output in the phosphating wastewater treatment process, and can recover the high value-added product hydroxyapatite

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  • Technological method for preparing hydroxyapatite by using phosphating waste water as raw material

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Embodiment 1

[0022] The phosphating wastewater of a stationery factory in Hangzhou is treated by the process method of the present invention (the workpiece is not pickled before phosphating, and the wastewater contains 254 mg / L of phosphorus). First, add NaOH solution to the wastewater, adjust the pH to 7.4, and remove Fe in the wastewater 2+ 、Ni 2+ 、Cu 2+ Heavy metal ion impurities such as heavy metal ions, standing and filtering to obtain the supernatant; then adding Ca(OH) to the obtained supernatant 2 , keep n(Ca) / n(P) at 1.5, stir at 40°C for 2h, then stand and age at 40°C for 6h, then filter, wash, and dry to obtain a solid product, and finally send the obtained solid product to In a muffle furnace, it was calcined at 700°C for 4h in an air atmosphere. The phosphorus removal efficiency of phosphating wastewater can reach 93.7%, and the purity of hydroxyapatite produced is 79%.

Embodiment 2

[0024] The phosphating wastewater of a large-scale metal surface treatment enterprise in Jiangsu is treated by the process method described in the present invention. First, add NaOH solution to the wastewater, adjust the pH to 7.8, and remove Fe in the wastewater 2+ 、Ni 2+ 、Cu 2+ Heavy metal ion impurities such as heavy metal ions, standing and filtering to obtain the supernatant; then adding Ca(OH) to the obtained supernatant 2 , keep n(Ca) / n(P) at 2.0, stir at 50°C for 4h, then stand and age at 50°C for 6h, then filter, wash and dry to obtain a solid product, and finally send the obtained solid product to In a muffle furnace, calcination at 800 °C for 6 hours in an air atmosphere to obtain hydroxyapatite. The phosphorus removal efficiency of phosphating wastewater can reach 95.1%, and the purity of hydroxyapatite is 73%.

Embodiment 3

[0026] The phosphating wastewater of a certain refrigerator factory in Hefei is treated by the process method of the present invention. First, add NaOH solution to the wastewater, adjust the pH to 8.5, and remove Fe in the wastewater 2+ 、Ni 2+ 、Cu 2+ Heavy metal ion impurities such as heavy metal ions, standing and filtering to obtain the supernatant; then adding Ca(OH) to the obtained supernatant 2 , keep n(Ca) / n(P) at 3.0, stir at 60°C for 6h, then stand and age at 60°C for 6h, then filter, wash, and dry to obtain a solid product, and finally send the obtained solid product to In a muffle furnace, calcination at 1000 ° C for 8 hours in an air atmosphere to obtain hydroxyapatite. The phosphorus removal efficiency of phosphating wastewater can reach 90.8%, and the purity of hydroxyapatite is 81%.

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Abstract

The invention relates to a technological method for preparing hydroxyapatite by using phosphating waste water as a raw material. Aiming at high concentration phosphating waste water, the method is used for disposing the high concentration phosphating waste water with NaOH as a regulator and Ca(OH)2 as a precipitant, and preparing hydroxyapatite at the same time. Fractional precipitation and a product morphology control method are adopted to ensure the purity of the hydroxyapatite and improve the quality of the hydroxyapatite. Simple in process and operation, the method can not only remove most PO4<3-> and heavy metal ions in phosphating waste water to make effluent quality up to an emission standard but also recycle the by-products, so that the method has good economic benefits and application prospects.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment and resource regeneration, and specifically relates to a process method for preparing hydroxyapatite by using phosphating wastewater as a raw material. Background technique [0002] Phosphating treatment is the process of forming an insoluble phosphate film on the metal surface by using a solution containing phosphoric acid or phosphate, which is a commonly used process technology for metal surface treatment. The general phosphating process includes alkali cleaning to remove oil, pickling and rust removal, phosphating and passivation treatment, during which a large number of pollutants are produced, such as emulsified oil, surfactants and phosphate, etc. The amount is relatively large, exceeding the standard seriously, and due to the wide variety of pollutants, it brings considerable difficulty to wastewater treatment. With the rapid development of the automobile manufactur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/32C02F1/52
CPCC01B25/321C01P2006/80C02F1/5236C02F2301/08
Inventor 叶飞赵泽华张后虎焦少俊张俊许元顺王俊杰王玉婷
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
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