Method for separating and recovering nickel, cobalt, magnesium, iron and silicon from nickel-bearing laterite

A technology for separation and recovery of laterite nickel ore is applied in the direction of improving process efficiency, which can solve the problems of high energy consumption and short furnace age, and achieve the effect of high extraction rate.

Inactive Publication Date: 2009-09-09
广西冶金研究院有限公司 +1
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Problems solved by technology

Electric furnace smelting requires high temperature, high energy consumption, difficult to solve furnace materials, and short furnace life
At present, there is no report on an ideal low-grade lateritic nickel ore smelting process

Method used

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Examples

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Embodiment Construction

[0025] The technical solutions of the present invention will be described in further detail below through examples.

[0026] The method for separating and recovering nickel-cobalt-magnesium-iron-silicon from laterite nickel ore of the present invention comprises the following steps:

[0027] 1. Sulfuric acid leaching

[0028] Take 270 grams of laterite nickel ore raw material, the main components are (wt%): Ni 1.82, Co 0.043, Fe 19.80, Mg 7.97. Add 628g / L H at a solid-to-liquid ratio of 1:3 2 SO 4 , was leached for 2 hours at 90°C, and suction-filtered with a Buchner funnel to obtain 930ml of leaching filtrate and 527 grams of filter cake, with a water content of 61.54wt% in the filter cake, 203 grams of dry residue, and 0.13wt% of Ni in the dry residue. According to 270 grams of raw ore, containing Ni 1.82wt%, the leaching rate of nickel is 94.63wt%.

[0029] 2. Pre-neutralize the leach filtrate with serpentine powder

[0030] Take the filtrate 930ml of the first step, add...

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Abstract

A method for separating and recovering nickel, cobalt, magnesium, iron and silicon from nickel-bearing laterite is disclosed; nickel, cobalt, magnesium and iron therein are leached out by using high-temperature peracid, leachate is pre-neutralized via serpentine powder, after the pre-neutralization, the leachate is neutralized by magnesite powder for de-ironing, and the scum is delivered for ironmaking after being dewatered by smoke gases in a fluidized bed furnace for making sulfuric acid, the de-ironed clear nickel liquid uses magnesite powder to precipitate nickel carbonate, and the precipitated liquid is concentrated and crystallized to obtain magnesium sulfate heptahydrate. The leached slag mainly contains silicon and can be used for making white carbon black. The invention can sufficiently recover and utilize nickel, cobalt, magnesium, iron and silicon in the nickel-bearing laterite, and the invention is simple in technology, low in energy consumption and pollution-free on environment.

Description

1. Technical field [0001] The invention relates to a hydrometallurgy method of laterite nickel ore, in particular to a method for separating and recovering nickel, cobalt, magnesium, iron and silicon from laterite nickel ore. 2. Background technology [0002] Lateritic nickel ore is divided into two types, one is limonite type, which is high in iron, low in nickel, low in silicon and magnesium, but high in cobalt. According to the traditional method, this ore should be processed by hydrometallurgy , but the leaching rate of nickel and cobalt in general wet smelting is low. If high-pressure leaching is used, the magnesium in it is easy to scar, which makes the operation difficult and the service life of the autoclave is not long. The other is silicon-magnesium-nickel ore, which has a high nickel content. In the past, it was considered that this kind of ore should be processed by pyrometallurgy. However, blast furnace smelting in pyrometallurgy has been eliminated due to backw...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B3/00C22B3/08C22B3/46C22B23/00C22B23/06C22B26/22
CPCY02P10/20
Inventor 伍耀明刘晨范庆丰何航军陈克勤黄瀚覃用宁苏鹏陈均宁黄进文
Owner 广西冶金研究院有限公司
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