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Method for continuously preparing low-cost battery grade ferric phosphate by utilizing iron filings

A ferric orthophosphate, battery-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of increasing equipment investment and operating costs, increasing the burden of washing and filtration, and large consumption of deionized water, etc. Achieve the effect of less washing water consumption, easy selection of separation device and fast reaction speed

Active Publication Date: 2016-09-28
云图新能源材料(荆州)有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If the consumption of deionized water is large, it will not only increase the cost, but also produce a large amount of sewage, which will bring great pressure to environmental protection.
On the other hand, ferrous sulfate solution is easily oxidized during the preparation process, resulting in extremely poor stability of product batches; and the solution mixes and reacts quickly to produce extremely small material particles, which further increases the burden of washing and filtration, and in the actual production process The selection of the filter is very harsh and the filtration efficiency is extremely low, thereby increasing the equipment investment and operating costs

Method used

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  • Method for continuously preparing low-cost battery grade ferric phosphate by utilizing iron filings
  • Method for continuously preparing low-cost battery grade ferric phosphate by utilizing iron filings
  • Method for continuously preparing low-cost battery grade ferric phosphate by utilizing iron filings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] (1) Phosphoric acid solution preparation

[0044] Weigh 100kg of phosphoric acid and add 325kg of deionized water and stir evenly to prepare a phosphoric acid solution with a concentration of 20% for later use; weigh 100kg of hydrogen peroxide with a concentration of 30% and add 400kg of deionized water and stir evenly to prepare a hydrogen peroxide solution with a concentration of 6% for later use , drive the prepared phosphoric acid solution and hydrogen peroxide solution into the high level tank with an explosion-proof pump;

[0045] (2) Dissolution-reaction

[0046]Weigh 42.5kg of iron red into the reaction kettle, and add 85kg of deionized water to stir vigorously. At the beginning, raise the temperature to the set temperature of 95°C. When the temperature rises to the set temperature, use the anti-corrosion pressure pump to adjust the step (1) 127.5kg of a good phosphoric acid solution is injected into the reactor feed port 4 and the air pressure nozzle 7 install...

Embodiment 2

[0054] (1) Solution preparation

[0055] Weigh 120kg of phosphoric acid and add 390kg of deionized water and stir evenly to prepare a phosphoric acid solution with a concentration of 85% for use. Weigh 100kg of hydrogen peroxide with a concentration of 28% and add 400kg of deionized water to mix evenly, and prepare a hydrogen peroxide solution with a concentration of 6% for use , drive the prepared phosphoric acid solution and hydrogen peroxide solution into the high level tank with an explosion-proof pump;

[0056] 2) Dissolution-reaction

[0057] Weigh 40kg of iron powder and pour it into the reaction kettle, add 350kg of deionized water and stir. At the beginning, the temperature rises to the set temperature of 45°C; 400kg is driven into the reactor feed port 4, and the pneumatic nozzle 7 installed at the 4 places starts to feed, and keeps stirring vigorously. The feeding time takes 2 hours to finish adding the phosphoric acid solution, and keeps stirring vigorously. The ...

Embodiment 3

[0066] (1) Solution preparation

[0067] Weigh 100kg of phosphoric acid and add 70kg of deionized water to stir evenly to make a 50% phosphoric acid solution for use. Weigh 100kg of hydrogen peroxide with a concentration of 30% and add 400kg of deionized water to stir evenly to prepare a 6% hydrogen peroxide solution for use. The good phosphoric acid solution and hydrogen peroxide solution are pumped into the high-level tank with an explosion-proof pump;

[0068] (2) Dissolution-reaction

[0069] Weigh 40 kilograms of cut iron scraps and place them in the reactor, add 200 kilograms of deionized water and stir slowly, and start the temperature rise to the set temperature of 90°C; after the temperature rises to the set temperature, use the anti-corrosion pressure pump to turn the step (1 ) 280 kg of phosphoric acid solution prepared into the reaction kettle feed port 4 installed pneumatic nozzle 7 began to feed, and slowly stirred, after adding phosphoric acid solution in 2 hou...

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Abstract

The invention discloses a method for continuously preparing low-cost battery grade ferric phosphate by utilizing iron filings. The method comprises the following steps: deionized water is pumped into an elevated tank; phosphoric acid is added into the elevated tank to prepare a phosphoric acid solution with the concentration being 20-85%; a hydrogen peroxide solution with the concentration being 6% is prepared in the same manner; the iron filings are added into a reaction kettle, the prepared phosphoric acid solution is added into the reaction kettle through an air-pressure type nozzle mounted at a material inlet of the reaction kettle, intense stirring is performed, and a template agent and a surfactant are added after the iron filings are completely dissolved; the prepared hydrogen peroxide solution is added, and products are extracted, filtered, washed and dried; finally, a battery grade ferric phosphate product is prepared through calcination. Raw materials used in the method are easy to obtain and low in price; the technology is simple, the operation is convenient, and the industrialization can be realized easily. The battery grade ferric phosphate material prepared according to the method has controllable appearance and particle size, the iron-phosphorus ratio ranges from 0.98 to 1.02, the batch stability is good, and the cost is low.

Description

technical field [0001] The invention belongs to the field of nano new energy materials, in particular to a new method for continuously preparing low-cost battery-grade iron orthophosphate by using iron scraps. Background technique [0002] The technology of lithium-ion batteries used in electric vehicles is relatively mature and has been recognized by the industry. In recent years, lithium iron phosphate has become a foregone conclusion as the positive electrode material of lithium batteries for electric vehicles. Especially at the end of 2015, when the Ministry of Industry and Information Technology "re-examined" the safety of three primary batteries for vehicles to solicit opinions, lithium iron phosphate has laid a solid foundation for its automotive battery industry. supremacy. A large number of battery companies have turned to the production and research and development of lithium iron phosphate batteries, which has caused the demand for lithium iron phosphate cathode ...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375C01P2004/03C01P2006/80
Inventor 郭孝东吴振国向伟钟本和
Owner 云图新能源材料(荆州)有限公司
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