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Method for separating nickel and iron from nickel-iron alloy and application

A technology of nickel-iron alloy and nickel-iron, which is applied in the direction of iron oxide/iron hydroxide, nickel sulfate, process efficiency improvement, etc., can solve the problems of high impurity content, high cost, poor quality of iron phosphate, etc., and achieve simple process flow, Great achievability, low acid consumption effect

Active Publication Date: 2021-06-11
HUNAN BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The iron phosphate obtained by this process is of poor quality and cannot reach the level of battery grade, and the nickel sulfate has to go through the extraction-reextraction process, which has high cost, low benefit, and relatively high impurity content

Method used

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  • Method for separating nickel and iron from nickel-iron alloy and application
  • Method for separating nickel and iron from nickel-iron alloy and application
  • Method for separating nickel and iron from nickel-iron alloy and application

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] The method for separating nickel and iron from nickel-iron alloy of the present embodiment may further comprise the steps:

[0043] (1) Weigh 200g of nickel-iron alloy (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%), add 2.5mol / L sulfuric acid solution for 1:8g / mL by solid-liquid ratio, dissolve at 80 ℃, after filtering, collect filtrate, obtain acid ferronickel Leachate;

[0044] (2) Add nickel-iron alloy powder to the ferronickel leaching solution obtained in step (1) to adjust the pH of the solution to 1.5, the time for adjusting the pH is 2h, and add iron powder of 0.8 times the theoretical amount required to replace nickel at 70°C After the replacement, filter to obtain sponge nickel and nickel sink mother liquor;

[0045] (3) adding hydrogen peroxide to the heavy nickel mother liquor obtained in step (2), ferrous iron in the solution can be oxidized to ferric iron and then hydrolyzed...

Embodiment 2

[0051] The method for separating nickel and iron from nickel-iron alloy of the present embodiment may further comprise the steps:

[0052] (1) Weigh 150g of nickel-iron alloy (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%) is 1: 6g / mL adding 2.5mol / L sulfuric acid solution according to mass solid-liquid ratio, dissolves at 85 ℃, filters, and gets filtrate to obtain acid ferronickel leaching solution;

[0053] (2) Add sodium carbonate to the acid nickel-iron leaching solution obtained in step (1) to adjust the pH of the solution to 1.8, the time for pH adjustment is 3h, and add 0.9 times the theoretical amount of iron required to replace nickel at 60°C Powder, after the replacement, filter to obtain sponge nickel and nickel sink mother liquor;

[0054] (3) The nickel-precipitated mother liquor obtained in step (2) is fed into oxygen, ferrous iron in the solution can be oxidized to ferric iron an...

Embodiment 3

[0059] The method for separating nickel and iron from nickel-iron alloy of the present embodiment may further comprise the steps:

[0060] (1) Weigh 100g of nickel-iron alloy (iron 67.22%, nickel 30.79%, Co: 0.47%, Mn: 0.08%, Si: 0.25%, Cr: 0.09%, Ca: 0.008%, Mg: 0.005%, Cu: 0.04 %, S: 0.29%, P: 0.05%), add 2mol / L hydrochloric acid solution according to the solid-liquid ratio of 1:8g / mL, dissolve at 65°C, filter, and take the filtrate to obtain the acid nickel-iron leaching solution;

[0061] (2) Add ammonia water to the acidic nickel-iron leaching solution obtained in step (1) to adjust the pH of the solution to 2.0, adjust the pH time for 4 hours, and add iron powder at 65°C that is 0.85 times the theoretical amount required to replace nickel. Filtration after the end to obtain sponge nickel and nickel sink mother liquor;

[0062] (3) Pass the heavy nickel mother liquor obtained in step (2) into air, ferrous iron in the solution can be oxidized to ferric iron and then hydro...

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Abstract

The invention belongs to the field of hydrometallurgy, and discloses a method for separating nickel and iron from a nickel-iron alloy and application. The method comprises the following steps: dissolving the nickel-iron alloy in an acid solution, filtering, and taking filtrate to obtain an acidic nickel-iron solution; adjusting the pH value of the acidic nickel-iron solution, heating, stirring, adding iron powder, and continuously heating and stirring to obtain sponge nickel and nickel precipitation mother liquor; enabling the nickel precipitation mother liquor to be subjected to oxidation iron precipitation to obtain ferric hydroxide slag and iron precipitation mother liquor; and dissolving sponge nickel into sulfuric acid, filtering, collecting filtrate, heating, and adjusting the pH value to obtain a nickel sulfate solution; According to the method, after the nickel-iron alloy is dissolved by using the acid liquor, nickel in the solution is replaced by iron powder to obtain sponge nickel, the nickel precipitation mother liquor is oxidized to generate ferric hydroxide, the nickel content is lower than 0.4%, the iron precipitation mother liquor can be returned to a leaching section, and the sponge nickel is subjected to acid dissolution, impurity removal and evaporative crystallization to obtain a battery-grade nickel sulfate product.

Description

technical field [0001] The invention belongs to the field of hydrometallurgy, in particular to a method and application for separating nickel and iron from a nickel-iron alloy. Background technique [0002] In recent years, with the rapid development of the lithium battery new energy industry, lithium-ion batteries have been widely used in various electronic devices due to their advantages such as high working voltage, high energy density, small self-discharge, long life, and no memory effect. Unlike other types of chemical power systems, the positive and negative electrode materials of lithium-ion batteries are still in constant innovation and development. As far as the current market analysis is concerned, NCM / NCA (battery cathode material) ternary materials occupy more than 50% of the market share, and the demand for nickel is increasing day by day. [0003] Worldwide, nickel production capacity is gradually in short supply. The supply of nickel sulfate is obviously ins...

Claims

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Application Information

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IPC IPC(8): C22B3/46C22B23/00C01G49/02C01G53/10
CPCC22B3/46C22B23/0469C01G49/02C01G53/10Y02P10/20
Inventor 何芳邓浩臻乔延超陈若葵阮丁山谌志新李长东
Owner HUNAN BRUNP RECYCLING TECH
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