Method for leaching low-nickel high-iron alloy powder selectively through nitric acid

A ferroalloy and selective technology, applied in the direction of improving process efficiency, can solve the problems of high iron removal cost, cobalt loss, and difficulty in iron removal, and achieve the effects of saving nitric acid consumption, saving production costs, and ensuring leaching rate

CN107338357AActive Publication Date: 2017-11-10JINCHUAN GROUP LIMITED
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Publication Date
2017-11-10

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Abstract

The invention discloses a method for leaching low-nickel high-iron alloy powder selectively through nitric acid. The method comprises the steps that firstly, primary leaching is conducted on the low-nickel high-iron alloy powder through the concentrated nitric acid; when total immersion is ended, magnetic separation is conducted; magnetic separation concentrate is returned for further leaching, so that after remaining ore pulp is filtered, leaching residues and a leaching solution are obtained, and the leaching solution enters a neutralization-for-iron-removal procedure; the low-nickel high-iron alloy powder is added to the leaching solution, so that neutralization for iron removal is conducted; after a neutralization-for-iron-removal reaction is ended, magnetic separation is conducted; magnetic separation concentrate is returned to the primary total immersion procedure, so that after ore pulp is filtered, neutralization iron slag and a separation and immersion solution are obtained; and the neutralization iron slag obtained after filtration is subjected to washing, drying and calcinations, so that an iron ore concentrate product with the iron content ranging from 60% to 65% is obtained. By means of the method, nickel and cobalt leaching and iron removal are completed through one step, and selective leaching of nickel, cobalt and iron is achieved; the nickel and the cobalt enter the solution, and the iron is inhibited in the slag, so that the nickel and the cobalt are effectively separated from the iron; and the leaching rate of the nickel and the cobalt is greater than 98%; the nickel content of the leaching residues is less than 0.5%, the iron content of the leaching residues is less than 10%, and the cobalt content of the leaching residues is less than 0.02%; the iron content of the neutralization iron slag is greater than 50%, and the nickel content o the neutralization iron slag is less than 0.1%; and the iron content of the separation and immersion solution is less than 3 g / L.
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Description

technical field

[0001] The invention belongs to the technical field of nonferrous metal hydrometallurgy, and in particular relates to a nitric acid selective leaching method for low-nickel and high-iron alloy powder. Background technique

[0002] The laterite nickel ore adopts the crude ferronickel produced by the RKEF smelting process, which is low-nickel and high-iron alloy powder, and the composition is 2%-8%Ni, 50%-68%Fe, 0.08%-0.3%Co, 0.1%-0.6%Mn , 3%-10%Mg, 0.3%-1.0%Al, 1.0%-2.8%Cr, 3%-10%Si. The ferronickel powder is mainly directly used in the production of stainless steel, in which nickel can only be used as a low-end product, and cobalt enters the stainless steel with nickel, causing a large loss of cobalt, which does not reflect the value of cobalt. The metals in the coarse nickel-iron powder mainly exist in the form of simple substances or alloys. Using traditional sulfuric acid leaching, the leaching rate of nickel and cobalt is below 50%, and a large amount of...

Examples

Embodiment 1

[0014] The composition of the low-nickel high-iron alloy powder is shown in Table 1.

[0015] Table 1: Composition of low-nickel high-iron alloy powder (%)

[0016]

[0017] The nitric acid selective leaching method of the low-nickel high-iron alloy powder comprises the following steps:

[0018] a) One-stage full immersion-magnetic separation: Add concentrated nitric acid to the low-nickel and high-iron alloy powder, the amount of concentrated nitric acid is 100ml / 100g of low-nickel and high-iron alloy powder, then add diluent to control the liquid-solid ratio to 5:1, the leaching temperature at 105°C, the leaching time is 4h, and NO is recovered during the leaching process x (a mixture of NO and NO2), magnetic separation is carried out at the end of full leaching, the magnetic separation concentrate returns to continue leaching, the rest of the pulp is filtered and separated from liquid to solid, and the obtained leaching slag is silicon slag, which is discharged outside;...

Embodiment 2

[0022] The composition of the low-nickel high-iron alloy powder is shown in Table 2.

[0023] Table 2: Composition of low-nickel and high-iron alloy powder (%)

[0024]

[0025] The nitric acid selective leaching method of the low-nickel high-iron alloy powder comprises the following steps:

[0026] a) One-stage full immersion-magnetic separation: Add concentrated nitric acid to the low-nickel and high-iron alloy powder, the amount of concentrated nitric acid is 200ml / 100g of low-nickel and high-iron alloy powder, then add diluent to control the liquid-solid ratio to 10:1, and the leaching temperature at 75°C, the leaching time is 8h, and NO is recovered during the leaching process x (a mixture of NO and NO2), magnetic separation is carried out at the end of full leaching, the magnetic separation concentrate returns to continue leaching, the rest of the pulp is filtered and separated from liquid to solid, and the obtained leaching slag is silicon slag, which is discharged ...

Embodiment 3

[0030] The composition of the low-nickel high-iron alloy powder is shown in Table 3.

[0031] Table 3: Composition of low-nickel and high-iron alloy powder (%)

[0032]

[0033] The nitric acid selective leaching method of the low-nickel high-iron alloy powder comprises the following steps:

[0034] a) One-stage full immersion-magnetic separation: Add concentrated nitric acid to the low-nickel and high-iron alloy powder, the amount of concentrated nitric acid added is 300ml / 100g of low-nickel and high-iron alloy powder, then add diluent to control the liquid-solid ratio to 8:1, and the leaching temperature at 90°C, the leaching time is 6h, and NO is recovered during the leaching process x (a mixture of NO and NO2), magnetic separation is carried out at the end of full leaching, the magnetic separation concentrate returns to continue leaching, the rest of the pulp is filtered and separated from liquid to solid, and the obtained leaching slag is silicon slag, which is discha...