Comprehensive treatment method for wastewater generated in iron phosphate production

A comprehensive treatment, iron phosphate technology, applied in the direction of natural water treatment, water/sewage treatment, water/sewage multi-stage treatment, etc., can solve the problems of insufficient recycling of active ingredients, high operating costs, etc., and achieve good market promotion value, realize full utilization, and reduce the effect of fluoride ion content

Active Publication Date: 2022-05-24
深圳永清水务有限责任公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In view of the problems of high operating costs and the inability to fully recycle the active ingredients in the mother liquor in the treatment technology of iron phosphate production wastewater at the present stage, it is necessary to achieve zero discharge of iron pho...

Method used

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  • Comprehensive treatment method for wastewater generated in iron phosphate production
  • Comprehensive treatment method for wastewater generated in iron phosphate production
  • Comprehensive treatment method for wastewater generated in iron phosphate production

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0044] Take activated alumina, wash it with deionized water for 5 times to remove surface impurities, immerse it in 0.02mol / L ferric sulfate solution under ultrasonic conditions (100 Hz) at 30°C for 5 hours, and wash it with deionized water after taking it out. 5 times, placed in a muffle furnace, heated to 450°C at a heating rate of 5-10°C / min, and kept for 6 hours to obtain modified activated alumina.

Embodiment 1

[0046] A certain annual output of 50,000 tons of iron phosphate production enterprises, the amount of wastewater and water quality are shown in Table 1 below:

[0047] Table 1 Composition of iron phosphate wastewater

[0048]

[0049] The following process scheme is used for processing:

[0050] (S1), the processing technique of washing water is: the washing water of ferric phosphate production waste water adds ammoniacal liquor, initially is outsourcing ammoniacal liquor, and after the technique goes through, use reclaimed ammoniacal liquor, adjust pH value to 3, filter, enter reverse osmosis membrane and concentrate, During concentration, the ratio of concentrated water and fresh water is 3:7, the gained concentrated water I is mixed with the mother liquor of ferric phosphate production wastewater, and the fresh water is directly reused or reused after advanced treatment according to the purpose.

[0051] (S2), the processing technique of mother liquor is:

[0052] (A) ...

Embodiment 2

[0070] Other conditions and operations are the same as in Example 1, except that in step (A), the fluorine-removing agent is aluminum sulfate, that is, no ferric sulfate is added, and the F ion concentration in the combined liquid phase is 8.3 mg / L. It is necessary to use more modified activated alumina to reduce the F ion concentration in the liquid phase to less than 1 mg / L. In order to achieve high-quality fluorine-free iron phosphate by-products, the cost increases. Explain that the present invention only uses a small amount of ferric sulfate and aluminum sulfate as a fluoride removal agent. The possible reason is that on the one hand, ferric sulfate and aluminum sulfate can cooperate to produce a synergistic effect to reduce the F ion content in the waste water; on the other hand, the added sulfuric acid Iron may have a modified effect on the activated alumina added later, further reducing the concentration of F ions. In addition, adding iron sulfate will not introduc...

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Abstract

The invention relates to a comprehensive treatment method for wastewater generated in iron phosphate production, the wastewater is divided into washing water and mother liquor, the comprehensive treatment method is characterized by comprising the following steps: (S1) washing water treatment: (S2) mother liquor treatment: A, fluorine removal; b, phosphorus removal; c, removing manganese; d, producing by-product calcium sulfate; e, removing calcium and magnesium; f, removing ammonia; and G, circulating. Zero emission of the iron phosphate wastewater is realized through process optimization, and according to different properties of various impurities, grading separation and recovery are performed, so that the resources are recovered to the maximum extent. According to the method, fluorine ions in the wastewater are removed in the early stage, a high-quality iron phosphate byproduct can be obtained, manganese dioxide and calcium sulfate are obtained in the subsequent stage, new impurities are not introduced while resources are recycled, a little surplus is obtained through cost benefit accounting, and the method is a comprehensive wastewater treatment method with great economic value.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a comprehensive treatment method for wastewater generated by iron phosphate production. Background technique [0002] In recent years, with the rapid development of the new energy industry, lithium batteries are favored due to their advantages of large energy storage, long life, good economy, and high safety. Lithium iron phosphate is one of the main lithium battery cathode materials currently commercialized at home and abroad, and its market demand continues to grow. As a precursor for the production of lithium iron phosphate cathode materials, its demand is also increasing year by year. In the production process of iron phosphate, it will go through processes such as synthesis, washing, aging, evaporation and drying. The production process of iron phosphate is different and the source of raw materials used is also different. Therefore, the composition of the generated wastew...

Claims

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Application Information

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IPC IPC(8): C02F9/10C01B25/37C01C1/02C01C1/28C01F11/46C01G45/02C02F101/10C02F103/34
CPCC02F9/00C01B25/375C01G45/02C01F11/46C01C1/022C01C1/28C02F1/001C02F1/441C02F1/66C02F1/281C02F1/5236C02F1/02C02F7/00C02F5/02C02F1/722C02F2101/105C02F2103/34Y02E60/10
Inventor 张颖宋乐山王俊包长春赵曙光曾子玥刘思李橙郑可卿李得元何超群李倩曹长
Owner 深圳永清水务有限责任公司
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