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Solvent extraction of ferronickel powder and waste liquor processing method

A treatment method and technology of ferronickel powder, applied in the treatment field of acid leaching and nickel precipitation wastewater, can solve problems such as environmental pollution, leaching agent sulfuric acid cannot be recycled, etc., and achieve the effects of reducing cost, increasing value, and improving utilization rate

Inactive Publication Date: 2009-08-19
YUNNAN TIN GROUP HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The direct nickel recovery rate of this method reaches 70-75%, the iron red contains 62-68% iron, and the iron yield can reach 70-75%, but the leaching agent sulfuric acid cannot be recycled, and a large amount of sulfate-containing waste Liquid, there is a certain problem of environmental pollution

Method used

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  • Solvent extraction of ferronickel powder and waste liquor processing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Main components of nickel iron powder: Ni6.95%, Fe 85.00%, particle size -200 mesh.

[0021] Hydrochloric acid leaching: Put 150Kg ferronickel powder, 980L water and 254Kg hydrochloric acid (containing 31% HCl) into the reactor, the liquid-solid ratio is 8:1, and the amount of hydrochloric acid added is 6 times the theoretical requirement of nickel in the ferronickel powder. Heat to 50-60°C, pass through compressed air, keep stirring and leaching for 18 hours. 152Kg of leaching residue and 1350L of leaching liquid were obtained. The leaching slag contains 0.15% nickel and 60.12% iron. The leaching rate of nickel and iron in the raw material is 97.81% and 28.33%.

[0022] Nickel precipitation in the leaching solution produces 34.40Kg of nickel sulfide, the nickel sulfide contains 28.73% nickel, and the nickel recovery rate is 94.83%.

[0023] The output of nickel precipitation wastewater 13101, the main component is: FeCl 2 87.31g / l, NiCl 2 0.53g / l, pH 2.5-3. 400l o...

Embodiment 2

[0025] Main components of nickel iron powder: Ni6.95%, Fe 85.00%, particle size -200 mesh.

[0026] Hydrochloric acid leaching: put 150Kg ferronickel powder, 600L water and 170Kg hydrochloric acid (containing HCl31%) into the reactor, the liquid-solid ratio is 5:1, the amount of hydrochloric acid added is 4 times the theoretical requirement of nickel in the ferronickel powder, and heated to 70~80℃, pass through the compressed air to keep stirring and leaching for 12 hours. 163Kg of leaching residue and 810L of leaching solution were obtained. The leaching slag contains 0.182% nickel and 64.03% iron. The leaching rate of nickel and iron in the raw material is 97.15% and 18.13%.

[0027] Nickel precipitation in the leaching solution produces 29.80Kg of nickel sulfide, the nickel sulfide contains 32.53% nickel, and the nickel recovery rate is 93.07%.

[0028] Output 780l of nickel precipitation wastewater, the main component is: FeCl 2 105.02g / l, NiCl 2 1.21g / l, pH 2.5-3. 40...

Embodiment 3

[0030] Main components of nickel iron powder: Ni6.95%, Fe 85.00%, particle size -200 mesh.

[0031] Hydrochloric acid leaching: put 150Kg ferronickel powder, 380L water and 85Kg hydrochloric acid (containing HCl31%) into the reactor, the liquid-solid ratio is 3:1, the amount of hydrochloric acid added is twice the theoretical requirement of nickel in the ferronickel powder, and heated to 90~100℃, pass through the compressed air to keep stirring and leaching for 7 hours. 186Kg of leaching residue and 520L of leaching solution were obtained. The leaching slag contains 0.28% nickel and 64.22% iron, and the leaching rate of nickel and iron in the raw material is 95.02% and 6.32%.

[0032] Nickel precipitation in the leaching solution produces 39.81Kg of nickel sulfide, the nickel sulfide contains 24..53% of nickel, and the recovery rate of nickel is 93.67%.

[0033] Output 490l of nickel precipitation wastewater, the main component is: FeCl 2 88.17g / l, NiCl 20.64g / l, pH 2.5-3....

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Abstract

The invention relates to a method for leaching nickel / iron powder and treating waste liquor thereof, in particular to a method for acid-leaching nickel / iron powder and treating nickel-precipitating waste liquor, belonging to the field of non-ferrous metallurgy. The method comprises the following steps: adding hydrochloric acid solution to the nickel / iron powder; heating; feeding air or oxygen for leaching; adding a nickel-precipitating agent to the leaching solution to precipitate nickel ions into nickel sulfide and obtaining the nickel-precipitating waste liquor containing chlorides at the same time; returning part of the nickel-precipitating waste liquor to the step of leaching the nickel / iron powder, atomizing the remaining waste liquor and mixing the atomized waste liquor with hot gases containing chlorine hydride; drying to obtain solid chlorides and gases containing chlorine hydride; absorbing and rinsing the gases containing chlorine hydride to output the chlorine hydride solution, and returning the chlorine hydride solution to the step of leaching the nickel / iron powder; and decomposing the solid chlorides into oxides and the hot gases containing chlorine hydride through calcinations. The method has the advantages of simple process, high recovery rate of nickel and cobalt and high production efficiency; chlorine hydride, as the leaching agent of the nickel / iron powder, can be recycled, therefore, the cost is low; and the method realizes zero discharge of the waste water, thereby preventing the environment from being polluted.

Description

technical field [0001] The invention belongs to the field of nonferrous metal metallurgy, and relates to a method for acid leaching of ferronickel powder and treatment of nickel-precipitated wastewater. Background technique [0002] Pyroreduction smelting to produce nickel-iron alloy and reduction-grinding to produce nickel-iron powder are one of the main treatment processes of laterite nickel ore. The disclosed process includes: (1) After the ore is crushed, it is sent to a drying kiln for drying, and then sent to be calcined and rotated kiln, at a temperature of 700°C, dry, preheat and calcinate to produce calcined sand; after the calcined sand is added to the electric furnace, it is then reduced and smelted with a reducing agent at a temperature of about 1500°C to produce a coarse nickel-iron alloy, (2) Laterite Nickel ore is crushed, mixed with reducing agent, additives and red clay according to a certain proportion, dried after ball making, reduced and roasted at 950-13...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/10C22B3/46
CPCY02P10/20
Inventor 王炜崔建明张雄林后宝明季登会
Owner YUNNAN TIN GROUP HLDG
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