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Method for preparing battery-grade iron phosphate by mine acid wastewater treatment solid waste

A mine acid wastewater, battery-grade technology, applied in chemical instruments and methods, phosphorus compounds, inorganic chemistry, etc., can solve the problems of transportation cost limiting sales radius, reducing iron phosphate cost, lithium iron phosphate production cost, and high cost of phosphoric acid railway line , to achieve high-value utilization, solve the problem of solid waste reduction, good economic and environmental benefits

Pending Publication Date: 2022-01-21
ZIJIN MINING GROUP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantage is that the cost of phosphate railway line is relatively high, and iron phosphate alone accounts for more than 30% of the cost of raw materials. Significantly reducing the cost of iron phosphate is one of the key factors to reduce the production cost of lithium iron phosphate
At present, the market mainly uses ferrous sulfate, a by-product of titanium dioxide, as a raw material to produce battery-grade iron phosphate. However, because titanium dioxide enterprises are mainly concentrated in the coastal areas of East China, central China and southwest China, transportation costs limit their sales radius; and many large titanium dioxide enterprises are Investing in self-built ferric phosphate production projects (such as Lomon Billion, China Nuclear Titanium Dioxide, etc.), resulting in a tight market for ferrous sulfate and an increase in prices

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  • Method for preparing battery-grade iron phosphate by mine acid wastewater treatment solid waste
  • Method for preparing battery-grade iron phosphate by mine acid wastewater treatment solid waste
  • Method for preparing battery-grade iron phosphate by mine acid wastewater treatment solid waste

Examples

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Embodiment 1

[0028] This example provides a method for preparing battery-grade iron phosphate by using mine acid wastewater to treat solid waste, such as figure 1 As shown, the specific steps include:

[0029] (1) Take 400g of mine acidic wastewater to treat solid waste (water content 50%), add dilute sulfuric acid solution with an acid concentration of 6g / L according to 3 times the dry weight of solid waste, and stir evenly; after heating to 60°C, add sodium metabisulfite, its The amount is 0.4 times of the molar amount of iron in acidic wastewater treatment solid waste, and the reaction time is 2h;

[0030] (2) adding calcium hydroxide solution to the slurry obtained in step (1), adjusting slurry pH=4.5, and then carrying out solid-liquid separation to remove metal impurity ions;

[0031] (3) add phosphoric acid and ammonium persulfate to the mixed oxidation reaction of step (2) gained filtrate simultaneously, wherein Fe:P: the mol ratio of ammonium persulfate is 0.9:1:0.55, and with am...

Embodiment 2

[0034] This example provides a method for preparing battery-grade iron phosphate by using mine acid wastewater to treat solid waste, such as figure 1 As shown, the specific steps include:

[0035] (1) Take 400g of mine acid wastewater to treat solid waste (water content 50%), add dilute hydrochloric acid solution with an acid concentration of 8g / L according to 4 times the dry weight of solid waste, and stir evenly; after heating to 70°C, add sulfur dioxide gas, and its molar The amount is 0.8 times the molar amount of iron in the acid wastewater treatment solid waste, and the reaction time is 1.5h;

[0036] (2) Add sodium hydroxide solution to the slurry obtained in step (1), adjust the slurry pH=5.0, and then carry out solid-liquid separation to remove metal impurity ions;

[0037] (3) add sodium dihydrogen phosphate and hydrogen peroxide to the mixed oxidation reaction of step (2) gained filtrate simultaneously, wherein Fe:P: the mol ratio of hydrogen peroxide is 0.95:1.05:...

Embodiment 3

[0040] A method for preparing battery-grade iron phosphate by using mine acid wastewater to treat solid waste in this embodiment, such as figure 1 As shown, the specific steps include:

[0041] (1) Get 400g of mine acid wastewater treatment solid waste (water content 50%), add dilute sulfuric acid solution with an acid concentration of 10g / L according to 5 times the dry weight of the solid waste, and stir evenly; after heating to 80°C, add sodium thiosulfate, Its molar weight is 1.0 times the molar weight of iron in acidic wastewater treatment solid waste, and the reaction time is 1.0 h;

[0042] (2) Add potassium carbonate solution to the slurry obtained in step (1), adjust slurry pH=5.5, and then carry out solid-liquid separation to remove metal impurity ions;

[0043] (3) Add potassium phosphate and hypochlorous acid to the mixed oxidation reaction to step (2) gained filtrate simultaneously, wherein Fe:P: the mol ratio of hypochlorous acid is 1.0:1.1:0.8, and the pH value ...

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Abstract

The invention discloses a method for preparing battery-grade iron phosphate by using mine acid wastewater treatment solid waste, the method comprises the following steps: leaching most of iron in slag by using the mine acid wastewater treatment solid waste as an iron source through reduction reaction, and then precipitating and purifying most of impurity metal ions such as aluminum, titanium, cobalt, nickel, copper, zinc, arsenic and the like; and finally, carrying out oxidation, precipitation and aging transformation to prepare the battery-grade iron phosphate (iron phosphate for HG / T 4701-2014 batteries) meeting the chemical industry standard. The method not only solves the problem of solid waste reduction, but also realizes high-value utilization of industrial solid waste, and has good economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the technical field of material synthesis, in particular to a method for preparing battery-grade iron phosphate by using mine acid wastewater to treat solid waste. Background technique [0002] At the beginning of the development of new energy vehicles, because the theoretical energy density of lithium iron phosphate batteries is lower than that of ternary cathode batteries, its application in power batteries is subject to certain limits. As BYD and Ningde Times have developed the "blade" and "PCT" battery technologies respectively, the energy density of the lithium iron phosphate system has been increased to 160Wh / kg, the situation has greatly improved, and the lithium iron phosphate battery with high safety factor and low cost is extremely popular. Big attention. According to the latest statistics of the Power Alliance (in May), the domestic power battery production totaled 13.8GWh, an increase of 165.8% year-on-year, of whi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/37
CPCC01B25/375C01P2002/72C01P2004/51C01P2006/82
Inventor 沈青峰王乾坤蒋开喜庄荣传唐定季常青江莉朱莞烨池荷婷廖祥辉
Owner ZIJIN MINING GROUP