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Iron-nickel alloy resource recycling method and application

A nickel-iron alloy and resource-based technology, applied in chemical instruments and methods, inorganic chemistry, phosphorus compounds, etc., can solve problems such as unfavorable promotion, increased cost, and increased extraction process, and achieve short process flow, low equipment requirements, and simple operation Effect

Active Publication Date: 2021-06-29
HUNAN BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Related technology discloses a kind of method that nickel-containing pig iron prepares nickel sulfate solution and battery grade ferric phosphate, wherein the method involved is to combine nickel-containing pig iron with phosphoric acid / sulfuric acid or The mixed acid of phosphoric acid / hydrochloric acid is used for acid leaching, then lye and oxidant are added to precipitate iron phosphate, and the obtained mixed solution of nickel sulfate and sodium sulfate / ammonium sulfate is extracted and back-extracted to obtain a pure nickel sulfate solution. This process is feasible , but the prepared ferric phosphate can’t reach the battery level, and the increase of the extraction process will lead to an increase in cost, which is not conducive to popularization

Method used

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  • Iron-nickel alloy resource recycling method and application

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Experimental program
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Effect test

Embodiment 1

[0058] The method for resource recycling of nickel-iron alloy of the present embodiment comprises the following steps:

[0059] (1) A nickel-iron alloy block of 1mm to 60mm (iron: 63.28%, nickel: 35.51%, Co: 0.34%, Mn: 0.09%, Si: 0.27%, Cr: 0.05%, Ca: 0.006%, Mg: 0.004 %, Cu: 0.03%, S: 0.21%, P: 0.03%) are ball milled, pulverized, and sieved to obtain ferronickel powder;

[0060] (2) Mix 100 g of ferronickel powder with 1 L of sulfuric acid with a concentration of 1.5 mol / L, heat to 90° C., react for 4 hours, and filter to obtain ferronickel-containing leaching solution and leaching residue;

[0061] (3) Add 0.9 times the theoretical amount of sodium phosphate to the leaching solution obtained in step (2), stir for 1 hour, add 1.3 times the theoretical amount of hydrogen peroxide, stir for 2 hours, then add 50 g of anhydrous iron phosphate, heat to 80 ° C, and react 6h, filtered to obtain ferric phosphate and precipitated liquid;

[0062] (4) pulping and washing the iron pho...

Embodiment 2

[0068] The method for resource recycling of nickel-iron alloy of the present embodiment comprises the following steps:

[0069] (1) 200g nickel-iron alloy block (iron: 63.28%, nickel: 35.51%, Co: 0.34%, Mn: 0.09%, Si: 0.27%, Cr: 0.05%, Ca: 0.006%, Mg: 0.004%, Cu : 0.03%, S: 0.21%, P: 0.03%) mixed with 1L of sulfuric acid with a concentration of 1.5mol / L, heated to 80°C, reacted for 12 hours and filtered to obtain the leach solution containing ferronickel and unreacted ferronickel alloy block ;

[0070] (2) adding 1.0 times of theoretical amount of phosphoric acid to the leaching solution obtained in step (2), after stirring for 0.5h, feed oxygen, and the reaction time is 5h;

[0071] (3) Add 100 g of ferric phosphate dihydrate to the ferric phosphorus solution obtained in step (3), heat to 90° C., react for 4 hours, and filter to obtain ferric phosphate and precipitated liquid;

[0072] (4) pulping and washing the ferric phosphate obtained in step (4) for 2 hours, drying fer...

Embodiment 3

[0075] The method for resource recycling of nickel-iron alloy of the present embodiment comprises the following steps:

[0076] (1) The nickel-iron alloy block (iron: 83.12%, nickel: 15.45%, Co: 0.51%, Mn: 0.05%, Si: 0.36%, Cr: 0.09%, Ca: 0.012%, Mg: 0.008%, Cu: 0.05%, S: 0.22%, P: 0.01%) were ball milled and sieved to obtain ferronickel powder;

[0077] (2) 200g ferronickel powder is mixed with 0.8L concentration of nitric acid of 2.5mol / L, heated to 85°C, reacted for 5h and then filtered to obtain ferronickel-containing leaching solution and leaching slag;

[0078] (3) Add 0.93 times the theoretical amount of ammonium phosphate to the leaching solution obtained in step (2), and mix and stir for 2 hours;

[0079] (4) Add 20 g of alumina and iron phosphate dihydrate to the iron phosphorus solution obtained in step (3), heat to 70° C., react for 12 hours, and filter to obtain iron phosphate and precipitated liquid;

[0080] (5) pulping and washing the ferric phosphate obtaine...

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Abstract

The invention belongs to the field of iron-nickel alloy hydrometallurgy, and discloses an iron-nickel alloy resource recycling method and application. The method comprises the following steps: (1) carrying out ball milling, crushing and sieving on iron-nickel alloy to obtain iron-nickel alloy powder; (2) leaching the iron-nickel alloy powder with an acid solution, heating and stirring, and filtering to obtain a leaching solution and leaching residues; (3) adding a phosphorus source into the leaching solution, mixing, stirring, heating, and filtering to obtain iron phosphate and a post-precipitation solution; and (4) adding a neutralizer into the post-precipitation solution, heating and stirring, and filtering to obtain a nickel-containing solution. According to the method, after a nickel-iron alloy is dissolved by using an acid solution, iron phosphate is prepared under the action of a phosphorus source or a phosphorus source added oxidant and a precipitation auxiliary agent, the iron phosphate can be further used as a precursor of lithium iron phosphate to prepare a lithium iron phosphate positive electrode material, and the nickel-containing solution with relatively low impurity content can be obtained after the solution after precipitation is subjected to impurity removal.

Description

technical field [0001] The invention belongs to the field of nickel-iron alloy hydrometallurgy, and in particular relates to a method and application of resource recycling of nickel-iron alloy. Background technique [0002] Nickel-iron alloy, as an alloying element additive, is mainly used in steelmaking and cast iron industries, among which, the most important use is as a raw material for smelting stainless steel. In recent years, the process of smelting ferronickel using laterite nickel ore has developed rapidly. However, due to the shortage of laterite nickel ore in China and the increasingly stringent domestic environmental protection requirements, a large number of companies have established smelters in Indonesia. It is expected that Indonesia's ferronickel Production will increase at an accelerated rate. In the medium and long term, the growth rate of ferronickel production in China and Indonesia is much higher than the production speed and consumption growth rate of s...

Claims

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Application Information

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IPC IPC(8): C01B25/37C22B23/00C22B3/06C22B3/44
CPCC01B25/375C22B23/0415C22B23/0461Y02P10/20C22B23/023C22B23/0423C22B23/043C22B23/0438C22B23/005C22B3/44C01B25/45C01G53/10
Inventor 何芳乔延超陈若葵阮丁山谌志新邓浩臻李长东
Owner HUNAN BRUNP RECYCLING TECH
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