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Method for resource utilization of wastewater in synthetic process of battery-grade iron phosphate

A synthesis process, iron phosphate technology, applied in chemical instruments and methods, phosphate, phosphorus oxyacids, etc., can solve the problems of increasing wastewater treatment costs, wastewater is not suitable for biological treatment, etc., and achieve good environmental protection and economic benefits , the effect of making up for the cost

Pending Publication Date: 2019-12-20
襄阳泽东新能源发展有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, sulfate radicals and a small amount of metal ions in iron phosphate wastewater can inhibit the growth of organisms, so the wastewater needs to be pretreated before microbial treatment. In addition, it is necessary to add a suitable carbon source in the post-treatment to adjust the appropriate pH, so that Increase the cost of wastewater treatment, so this kind of wastewater is not suitable for biological treatment

Method used

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  • Method for resource utilization of wastewater in synthetic process of battery-grade iron phosphate

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Effect test

Embodiment 1

[0032] After mixing the filtrate from the synthesis step and the conversion step in the synthesis process of battery-grade ferric phosphate, add ammonia water to neutralize while stirring, and adjust the pH of the solution to 7. Then the mixed solution is pumped into a plate-and-frame filter for filtration to obtain solid slag and a sulfate solution containing high-concentration ammonium salt and phosphate.

[0033] The above-mentioned sulfate solution containing high concentration of ammonium salt and phosphate is pumped into the manganese sand filter for further filtration, so that the content of suspended particles and iron ions in the filtrate is further reduced, so that SS≤5ppm, Fe≤0.1ppm. The filtrate passing through the manganese sand filter is then introduced into the ultrafiltration device through a pump, so that the filtrate index can meet the water inlet requirements of ultra-high pressure reverse osmosis (UPHRO). The ultra-filtered water is subjected to ultra-high ...

Embodiment 2

[0035] After mixing the filtrate from the synthesis step and the conversion step in the synthesis process of battery-grade ferric phosphate, add ammonia water for neutralization while stirring, and adjust the pH of the solution to 7.5. Then the mixed solution is pumped into a plate and frame filter for filtration to obtain solid slag and a sulfate solution containing high concentrations of ammonium salt and phosphate.

[0036] Pump the above solution into a manganese sand filter for further filtration to further reduce the suspended particles and iron ion content in the filtrate so that SS≤5ppm and Fe≤0.1ppm. The filtrate passing through the manganese sand filter is then introduced into the ultrafiltration device through a pump, so that the filtrate index can meet the water inlet requirements of ultra-high pressure reverse osmosis (UPHRO). The ultra-filtered water is subjected to ultra-high pressure reverse osmosis (UPHRO) to concentrate the initial concentration of waste liqu...

Embodiment 3

[0038] After mixing the filtrate from the synthesis process and the conversion process in the battery-grade iron phosphate synthesis process, adding ammonia water to neutralize while stirring, and adjusting the pH of the solution to 8. Then the mixed solution is pumped into a plate and frame filter for filtration to obtain solid slag and a sulfate solution containing high concentrations of ammonium salt and phosphate.

[0039]Pump the above solution into a manganese sand filter for further filtration to further reduce the suspended particles and iron ion content in the filtrate so that SS≤5ppm and Fe≤0.1ppm. The filtrate passing through the manganese sand filter is then introduced into the ultrafiltration device through a pump, so that the filtrate index can meet the water inlet requirements of ultra-high pressure reverse osmosis (UPHRO). The ultra-filtered water is subjected to ultra-high pressure reverse osmosis (UPHRO) to concentrate the initial concentration of waste liqui...

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Abstract

The invention discloses a method for resource utilization of wastewater in the synthetic process of battery-grade iron phosphate. The method comprises the following steps: a, adding ammonia water to adjust the pH value of the wastewater generated in the synthetic process of the iron phosphate to 7-8 to obtain a solution; b, filtering the solution for multiple times to obtain a product, namely a filtrate without suspended solids; c, pumping the filtrate into an ultrahigh-pressure reverse osmosis device, and performing a reaction to obtain concentrated water A and fresh water A; d, introducing the concentrated water A into an MVR evaporative crystallization device, carrying out vacuum concentration evaporative crystallization to obtain an ammonium sulfate and monoammonium phosphate mixture and evaporation condensate water, and carrying out centrifugal separation on the ammonium sulfate and monoammonium phosphate mixture to respectively obtain ammonium sulfate and monoammonium phosphate;e, mixing the fresh water A and the evaporation condensate water, and pumping the mixed water into a primary reverse osmosis device to obtain concentrated water B and fresh water B; and f, pumping theconcentrated water B into an ultrahigh-pressure reverse osmosis device, and recovering the fresh water B. The method has the beneficial effect that the treatment cost of the wastewater can be saved.

Description

technical field [0001] The invention relates to the field of inorganic materials, in particular to a method for resource utilization of waste water in the synthesis process of battery-grade iron phosphate. Background technique [0002] Iron phosphate is an ideal precursor for lithium-ion power batteries, electric tool batteries, energy storage equipment batteries and other battery cathode materials. With the rapid development of new energy vehicles, the market demand for power batteries and energy storage equipment batteries is increasing, so the demand for iron phosphate is also increasing. However, in the production process of iron phosphate, a large amount of high-concentration ammonium salt, phosphate and sulfate wastewater will be produced. If the wastewater is not treated properly, it will cause serious pollution and ecological damage to the surrounding environment, which will greatly restrict the development of enterprises. [0003] For iron phosphate production wast...

Claims

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Application Information

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IPC IPC(8): C01B25/28C01C1/24C02F9/10C02F101/10C02F101/16
CPCC01B25/28C01C1/24C02F9/00C02F1/66C02F1/001C02F1/444C02F1/441C02F1/04C02F2101/16C02F2101/101C02F2101/10C02F2101/105
Inventor 宋开荣刘雄才郭勇张红胜王强胜
Owner 襄阳泽东新能源发展有限公司
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