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Method for one-step acid leaching of laterite-nickel ore and co-production of lithium iron phosphate positive electrode active material

A cathode active material, laterite nickel ore technology, applied in chemical instruments and methods, phosphorus compounds, battery electrodes, etc., can solve the problems of low leaching selectivity and unsatisfactory electrical performance of materials, achieve uniform particle and size, improve Electron conductivity and lithium ion diffusivity, and the effect of improving battery specific capacity

Active Publication Date: 2020-07-31
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the technical problems that the existing laterite nickel ore element leaching selectivity is not high, and the electrical performance of co-produced materials is not ideal, the present invention innovatively provides a one-step high-pressure phosphoric acid leaching of laterite nickel ore and co-production of high-performance lithium iron phosphate Positive electrode active material; aims to achieve high selective separation of high-value elements (such as nickel / cobalt, etc.) Co-deposition to improve the electrochemical performance of the resulting material

Method used

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  • Method for one-step acid leaching of laterite-nickel ore and co-production of lithium iron phosphate positive electrode active material
  • Method for one-step acid leaching of laterite-nickel ore and co-production of lithium iron phosphate positive electrode active material
  • Method for one-step acid leaching of laterite-nickel ore and co-production of lithium iron phosphate positive electrode active material

Examples

Experimental program
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Effect test

Embodiment 1

[0056] Crush the laterite nickel ore to obtain laterite nickel ore powder with a particle size of 1 mm, add phosphoric acid solution to the laterite nickel ore, and mix to obtain laterite nickel ore slurry; wherein, the ratio of the acid solution to the laterite nickel ore mass is 10:1; the phosphoric acid solution in the phosphoric acid solution The mass ratio of mass to laterite nickel ore is 3:1. The ore slurry is poured into a sealed reactor, and stirred and leached at a temperature of 130°C for 90 minutes, wherein the leaching pressure is 0.27MPa, and the stirring speed is 30rpm. The yield of iron phosphate is 1.69 times of the quality of laterite nickel ore, and the phase analysis of iron phosphate is as follows: figure 1 , the main component is ferric phosphate dihydrate; the main components of ferric phosphate are as shown in Table 2, with a purity of 98%, and doped with metals such as aluminum and manganese, wherein the iron / phosphorus molar ratio is 0.9, (iron+alumin...

Embodiment 2

[0061] Crush the laterite nickel ore to obtain laterite nickel ore powder with a particle size of 1 mm, add phosphoric acid solution to the laterite nickel ore, and mix to obtain laterite nickel ore slurry; wherein, the ratio of the acid solution to the laterite nickel ore mass is 6:1; the phosphoric acid solution in the phosphoric acid solution The mass ratio of mass to laterite nickel ore is 3:1. The ore slurry is poured into a sealed reactor, and stirred and leached at a temperature of 120°C for 90 minutes, wherein the leaching pressure is 0.2MPa, and the stirring speed is 30rpm. The yield of iron phosphate is 1.65 times of the quality of laterite nickel ore, and the main component is iron phosphate dihydrate with a purity of 98%. The result is similar to that of Example 1.

[0062] After drying the obtained iron phosphate product, it is evenly mixed with lithium carbonate at a molar ratio of 1:1 and then roasted to obtain a lithium iron phosphate positive electrode materia...

Embodiment 3

[0064] Crush the laterite nickel ore to obtain laterite nickel ore powder with a particle size of 1mm, add phosphoric acid solution to the laterite nickel ore, and mix to obtain laterite nickel ore slurry; wherein, the ratio of the acid solution to the laterite nickel ore mass is 8:1; the phosphoric acid solution in the phosphoric acid solution The mass ratio of mass to laterite nickel ore is 4:1. The ore slurry is poured into a sealed reaction kettle, and stirred and leached at a temperature of 140°C for 60 minutes, wherein the leaching pressure is 0.36MPa, and the stirring speed is 30rpm. The yield of iron phosphate is 1.70 times of the mass of laterite nickel ore. The main component is ferric phosphate dihydrate with a purity of 98%, and the result is similar to Example 1.

[0065] After drying the obtained iron phosphate product, it is evenly mixed with lithium carbonate at a molar ratio of 1:1 and then roasted to obtain a lithium iron phosphate positive electrode materia...

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Abstract

The invention belongs to the field of laterite-nickel ore smelting and electrochemical application, and particularly provides a method for one-step acid leaching of laterite-nickel ore and co-production of a lithium iron phosphate positive electrode material. The method comprises the following steps that the laterite-nickel ore is mixed with a phosphoric acid solution with a certain solubility, then the mixed ore pulp is injected into a closed reactor, and leaching is carried out under the conditions that the temperature is 110 - 150 DEG C and the pressure is 0.2 - 0.5 MPa, solid-liquid separation is carried out after the leaching is completed to obtain an iron phosphate precursor product, and lithium adding roasting is further carried out to obtain the lithium iron phosphate positive electrode material. According to the method, selective separation of iron and nickel and cobalt in the laterite-nickel ore can be achieved, in addition, synchronous coprecipitation of iron, aluminum and manganese can be achieved in the leaching process, iron phosphate doped with metal ions is obtained, and the battery performance of the prepared material is improved.

Description

technical field [0001] The invention discloses a method for one-step acid leaching of laterite nickel ore and co-production of lithium iron phosphate cathode active material, and belongs to the field of laterite nickel ore smelting and electrochemical application. Background technique [0002] Lithium batteries are widely used due to their advantages such as high specific energy, high battery voltage, wide operating temperature range, and long storage life. In recent years, the country has vigorously developed new energy sources. With the rapid advancement of the industrialization of new energy vehicles, the demand for batteries has increased significantly. Currently mainstream lithium batteries include lithium iron phosphate batteries and ternary lithium-ion power batteries. Among them, lithium iron phosphate batteries have the advantages of good thermal stability, high specific energy, good cycle performance, excellent safety performance, and no memory effect, and are wid...

Claims

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Application Information

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IPC IPC(8): C22B3/06C22B23/00C01B25/37C01B25/45H01M4/58H01M10/0525
CPCC01B25/375C01B25/45C01P2004/03C01P2004/50C01P2006/40C01P2006/80C22B3/06C22B23/0415H01M4/5825H01M10/0525Y02E60/10
Inventor 罗骏李光辉姜涛饶明军彭志伟张鑫
Owner CENT SOUTH UNIV
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