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Normal-pressure leaching method for high-grade nickel matte and nickel sulfate

A leaching, atmospheric pressure technology, applied in the direction of nickel sulfate, process efficiency improvement, etc., can solve the problems of high oxidant consumption, high manufacturing cost, large equipment volume, etc., to improve mass transfer efficiency, leaching process safety, and improve leaching. rate effect

Active Publication Date: 2021-11-02
HUNAN CNGR NEW ENERGY TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a nickel raw material, high-matte nickel belongs to the sulfide eutectic of nickel, copper, cobalt, iron and other metals. Nickel, copper, and cobalt mainly exist in sulfide phase and a small amount of alloy phase. High consumption, high cost
Although the existing technology mentions atmospheric pressure + high pressure leaching, the leaching rate in the normal pressure process is low, only 30-50%, and the material throughput of the subsequent high pressure leaching system is still large, the equipment is bulky, the manufacturing cost is high, and the safety is low

Method used

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  • Normal-pressure leaching method for high-grade nickel matte and nickel sulfate
  • Normal-pressure leaching method for high-grade nickel matte and nickel sulfate
  • Normal-pressure leaching method for high-grade nickel matte and nickel sulfate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] Grinding: Grind 5 kg of high nickel matte (purchased from Jilin Jien Nickel Industry Co., Ltd.) to 150 mesh with a ball mill. The test results of high nickel matte are shown in Table 1.

[0068] Table 1 Detection results of high nickel matte composition

[0069] Co% Mn% Ni% Cu% Fe% Al％ 1.17 0.0028 60.29 12.59 3.28 0.0005 Ca% Mg% As% S％ Zn% h 2 O%

0.0014 0.0011 0.055 12.53 0.0003 0.93

[0070] The first normal pressure leaching: after grinding, high nickel matte is slurried with water according to the ratio of high nickel matte mass (kg) to water volume (L) as 1:8 (water 40L), and concentrated sulfuric acid is added after slurrying to control the leaching pH value Maintained at 1.0, the leaching tank is supplemented by ultrasonic oxygen leaching. During the period, the leaching slurry in the leaching tank passes through the sanding equipment and returns to the leaching tank for continuous cycle leaching. The ultr...

Embodiment 2

[0074] The difference with embodiment 1 only lies in:

[0075] The first normal pressure leaching: after grinding, high nickel matte is slurried with water according to the ratio of high nickel matte mass (kg) to water volume (L) as 1:6 (water 30L), and concentrated sulfuric acid is added after slurrying to control the leaching pH value Maintained at 1.2, the leaching tank is supplemented by ultrasonic oxygen leaching, during which the leaching slurry in the leaching tank passes through the sanding equipment and then returns to the leaching tank for continuous cycle leaching, the ultrasonic frequency is 50kHz, and the flux of oxygen is 20m 3 / (h*ton of dry material), oxygen concentration 88%, solid-liquid separation after leaching for 9 hours to obtain the first leaching liquid and the first leaching slag, the slag contains nickel after accounting, the leaching rate of nickel after the first normal pressure leaching reaches 53.29% .

[0076] The second atmospheric pressure le...

Embodiment 3

[0079] The difference with embodiment 1 is:

[0080] The first atmospheric pressure leaching: after grinding, high nickel matte is slurried with water according to the ratio of high nickel matte mass (kg) to water volume (L) as 1:10 (water 50L), and concentrated sulfuric acid is added after slurrying to control the leaching pH value Maintained at 0.5, the leaching tank is supplemented by ultrasonic oxygen leaching, during which the leaching slurry in the leaching tank returns to the leaching tank after passing through the sand grinding equipment, continuous cycle leaching, ultrasonic frequency 80kHz, oxygen flux 50m 3 / (h*t dry material), oxygen concentration 95%, solid-liquid separation after leaching for 6 hours to obtain the first leaching liquid and the first leaching slag, the slag contains nickel after accounting, the leaching rate of nickel after the first normal pressure leaching reaches 55.52% .

[0081] The second atmospheric pressure leaching: the first leaching sl...

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Abstract

The invention provides a normal-pressure leaching method for high-grade nickel matte and nickel sulfate.The method comprises first normal-pressure leaching and second normal-pressure leaching, ultrasonic waves and oxygen are applied in the first normal-pressure leaching process and the second normal-pressure leaching process, on one hand, no hydrogen peroxide is consumed, the leaching cost is low, and the risks of transportation, storage and process management and control are avoided; on the other hand, the stability of the raw materials in the leaching process is destroyed, the raw materials are prevented from being wrapped by leaching liquid, the activity is prevented from being reduced, the Ni leaching rate in the normal-pressure leaching process is increased, the material throughput of a high-pressure leaching system is greatly reduced, the volume design quantity of an autoclave is small, and production control is safer; and finally, oxygen is promoted to be in efficient contact with the raw materials and hydrogen sulfide generated in the leaching process, hydrogen sulfide can be rapidly converted into sulfuric acid, the treatment risk of hydrogen sulfide gas is effectively reduced, and the leaching process is safer.

Description

technical field [0001] The application relates to the technical field of hydrometallurgy, in particular to a high-pressure nickel matte leaching method and nickel sulfate. Background technique [0002] In the current development of ternary batteries, the tendency of high nickel is becoming more and more obvious. High nickel and reduced cobalt can increase the energy density of the battery and reduce the cost of the battery. As a nickel raw material, high-matte nickel belongs to the sulfide eutectic of nickel, copper, cobalt, iron and other metals. Nickel, copper, and cobalt mainly exist in sulfide phase and a small amount of alloy phase. High consumption and high cost. Although the existing technology mentions atmospheric pressure + high pressure leaching, the leaching rate in the normal pressure process is low, only 30-50%, and the material throughput of the subsequent high pressure leaching system is still large, the equipment is bulky, the manufacturing cost is high, and...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B23/00C01G53/10
CPCC22B7/007C22B23/043C01G53/10Y02P10/20
Inventor 刘增威王博宇肖超訚硕
Owner HUNAN CNGR NEW ENERGY TECH CO LTD
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