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Method for preparing battery-grade iron phosphate by utilizing iron oxide waste material in metal processing industry

A metal processing, iron oxide technology, applied in chemical instruments and methods, non-metallic elements, phosphorus compounds, etc., can solve problems such as environmental pollution, reduce production costs, facilitate promotion and popularization, and solve the effects of environmental pollution

Active Publication Date: 2017-12-22
江苏荣信环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Strong acid groups (such as sulfate groups) introduced by strong acids are easy to attach to the surface of the ferric phosphate product to make the product acidic, so it is often necessary to use ammonium to adjust the pH. In addition, taking sulfate as an example, when ferric phosphate products are used as raw materials When used to prepare lithium iron phosphate, the sulfate radicals in it will produce sulfur dioxide after sintering, causing environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing battery-grade iron phosphate from iron oxide waste in the metal processing industry, comprising the steps of:

[0027] S1. Add iron oxide waste into the reaction kettle, and add waste acid to adjust the pH value, and after stirring evenly, use a filter press to filter to obtain filter residue 1 and filtrate 1;

[0028] S2. Add the filter residue 1 in the step S1 to the reaction kettle, and add phosphoric acid and hydrochloric acid to adjust the pH value. After stirring and reacting, use a filter press to filter to obtain filter residue 2 and filtrate 2;

[0029] S3, adding sodium sulfide solution to filtrate 1, stirring and reacting, and then filtering to obtain filter residue 3 and filtrate 3;

[0030] S4. Add the filter residue 2 in the step S2 to the reaction kettle, and add tap water to wash and filter to obtain the filter residue 4 and the filtrate 4. The filter residue 4 can be directly discharged harmlessly, and the filtrate 4 can be used a...

Embodiment 2

[0044] A method for preparing battery-grade iron phosphate from iron oxide waste in the metal processing industry, comprising the steps of:

[0045] S1. Add iron oxide waste into the reaction kettle, and add waste acid to adjust the pH value, and after stirring evenly, use a filter press to filter to obtain filter residue 1 and filtrate 1;

[0046] S2. Add the filter residue 1 in the step S1 to the reaction kettle, and add phosphoric acid and hydrochloric acid to adjust the pH value. After stirring and reacting, use a filter press to filter to obtain filter residue 2 and filtrate 2;

[0047] S3, adding sodium sulfide solution to filtrate 1, stirring and reacting, and then filtering to obtain filter residue 3 and filtrate 3;

[0048] S4. Add the filter residue 2 in the step S2 to the reaction kettle, and add tap water to wash and filter to obtain the filter residue 4 and the filtrate 4. The filter residue 4 can be directly discharged harmlessly, and the filtrate 4 can be used a...

Embodiment 3

[0062] A method for preparing battery-grade iron phosphate from iron oxide waste in the metal processing industry, comprising the steps of:

[0063] S1. Add iron oxide waste into the reaction kettle, and add waste acid to adjust the pH value, and after stirring evenly, use a filter press to filter to obtain filter residue 1 and filtrate 1;

[0064] S2. Add the filter residue 1 in the step S1 to the reaction kettle, and add phosphoric acid and hydrochloric acid to adjust the pH value. After stirring and reacting, use a filter press to filter to obtain filter residue 2 and filtrate 2;

[0065] S3, adding sodium sulfide solution to filtrate 1, stirring and reacting, and then filtering to obtain filter residue 3 and filtrate 3;

[0066] S4. Add the filter residue 2 in the step S2 to the reaction kettle, and add tap water to wash and filter to obtain the filter residue 4 and the filtrate 4. The filter residue 4 can be directly discharged harmlessly, and the filtrate 4 can be used a...

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Abstract

The invention discloses a method for preparing a battery-grade iron phosphate by utilizing an iron oxide waste material in the metal processing industry. The method comprises the following steps: filtration for seven times, distillation at two times, electrolysis at two times and roasting for one time. Compared with a conventional preparation process, the method for preparing the battery-grade iron phosphate by utilizing the iron oxide waste material in the metal processing industry has the advantages that production of sulfur dioxide is avoided, and the prepared iron phosphate does not contain iron oxide and chloride ions, so that the quality is higher, and an iron phosphate lithium battery prepared by the method has no problem of short circuit of elementary iron and can realize quick charging. New energy materials are converted by utilizing solid wastes, so that the problem of environmental pollution in local places is solved, the high-quality iron phosphate also can be prepared, sustainable development of the metal product industry is promoted, and the production cost of the new energy materials is reduced; meanwhile, an elementary lead-zinc raw material can be prepared from the iron oxide waste material, ferrous chloride and sodium hypochlorite also can be prepared, and promotion and popularization are facilitated.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and more specifically relates to a method for preparing battery-grade iron phosphate from iron oxide waste in the metal processing industry. Background technique [0002] Ferric phosphate, also known as ferric phosphate or ferric orthophosphate, has a molecular formula of FePO4 and is a white, off-white monoclinic crystal powder. It is the salt of iron salt solution and sodium phosphate, and the iron in it is positive trivalent. Its main purpose is to manufacture lithium iron phosphate battery materials, catalysts and ceramics. The color of high-purity ferric phosphate dihydrate is near white or light (light) yellow-white powder. With the loss of crystal water, the color gradually turns yellow, and the pure anhydrous is yellow-white powder. When the phosphorus in ferric phosphate dihydrate exceeds the standard, the appearance is off-white or dark off-white; if the iron exceeds the sta...

Claims

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Application Information

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IPC IPC(8): C01B25/37
CPCC01B25/375
Inventor 邓超群施荣标
Owner 江苏荣信环保科技有限公司
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