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Method for lowering content of magnesium in pentlandite concentrate

A technology of pentlandite and magnesium content, which is applied in the field of mineral separation, can solve the problems of high energy consumption, high MgO content, waste of resources, etc., achieve good separation selectivity, increase specific surface area, and reduce repulsion energy Effect

Active Publication Date: 2014-07-23
NORTHEASTERN UNIV
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Problems solved by technology

The nickel sulfide in the ore is mainly recovered by flotation, and there are two main problems in the recovery process: one is the low recovery rate of valuable metals; the other is the high content of MgO in the concentrate
The reason for the high magnesium is that there are a large number of magnesium-rich gangue minerals in the ore, such as serpentine, talc, chlorite, etc. These minerals have good buoyancy and low hardness during the grinding process. It is easy to over-grind, causing these fine gangue particles to easily adhere to the surface of useful minerals to form "heterogeneous agglomeration", and then float together into the concentrate, resulting in a high content of MgO in the concentrate grade. When the MgO content exceeds 6.8 %, the nickel grade will decrease correspondingly, so it is necessary to use an electric furnace with high energy consumption, high cost, low processing capacity, serious pollution and low efficiency for smelting, resulting in a serious waste of resources
[0003] At present, the main process for magnesium reduction is flotation. Researchers have done a lot of research work on flotation process, flotation agent system and flotation equipment, and have achieved remarkable results, especially in flotation process. Research institutes and universities at home and abroad have proposed a variety of processes, such as stage grinding-stage separation, flash flotation, acid flotation, BFP process, electrochemical control flotation, etc., and have also achieved certain results. Some processes have poor adaptability to changes in ore properties, resulting in inability to perform stably

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  • Method for lowering content of magnesium in pentlandite concentrate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The actual ore is Jinchuan low-grade pentlandite concentrate, containing 3.25% Ni, 9.49% pentlandite, 8.58% MgO, and 90% with a particle size of <0.075mm.

[0034] A method for reducing magnesium content in pentlandite concentrate, comprising the following steps:

[0035] 1. Disperse pulp

[0036] Add 100g of low-grade pentlandite concentrate to 400mL of water, mix well, pour it into a high-speed shear mixer at a speed of 1500r / min, adjust the pH value of the slurry to 10.5-11.0 with sodium carbonate while stirring; Add 20mg of sodium hexametaphosphate to the mixture, the rotation speed is 1500r / min, shear and stir for 5min, so that the pulp is evenly dispersed;

[0037] 2. Add magnetic seeds and surfactants

[0038] Add 4g of magnetite powder with a particle size of <10μm, 10mg of oleic acid and 10mg of kerosene to the stirred and dispersed pulp; adjust the rotation speed to 1200r / min, and shear and stir for 4min;

[0039] 3. Magnetic separation

[0040] Pour the o...

Embodiment 2

[0052] 1. Disperse pulp

[0053] Mix pentlandite concentrate and serpentine pure minerals according to the mass ratio of 1:1 to obtain artificial mixed ore; add 70g of mixed ore to 200mL of water, mix well, put it into a high-speed shear mixer, and the speed is 2500r / Min, while stirring, use sodium bicarbonate to adjust the pH value of the pulp between 10.0 and 10.5; then add 35 mg of sodium hexametaphosphate to the pulp, at a speed of 2500 r / min, shear and stir for 3 minutes, so that the pulp is evenly dispersed;

[0054] 2. Add magnetic seeds and surfactants

[0055] Add 3.5g of magnetite powder with a particle size of <10μm, 17.5mg of oleic acid and 17.5mg of kerosene to the stirred and dispersed pulp; adjust the speed to 1500r / min, and shear and stir for 6min;

[0056] 3. Magnetic separation

[0057] Pour the ore slurry stirred in step 2 into the feeding cylinder of the XCSQ-50×70 wet strong magnetic machine, and set the background magnetic field strength to 6.5×10 5 A...

Embodiment 3

[0060] 1. Disperse pulp

[0061] Mix pentlandite concentrate and serpentine pure minerals according to the mass ratio of 2:1 to obtain artificial mixed ore; add 100g of mixed ore to 300mL of water, mix well, and put it into a high-speed shear mixer with a speed of 2200r / Min, while stirring, use sodium carbonate to adjust the pH value of the pulp between 9.5 and 10.0; then add 40mg of water glass to the pulp, the speed is 2200r / min, shear and stir for 5min, so that the pulp is evenly dispersed;

[0062] 2. Add magnetic seeds and surfactants

[0063] Add 4g titanomagnetite powder with a particle size of <10μm, 20mg oleic acid and 20mg kerosene to the stirred and dispersed pulp; adjust the rotation speed to 1300r / min, and shear and stir for 5min;

[0064] 3. Magnetic separation

[0065] Pour the ore slurry stirred in step 2 into the feeding cylinder of XCSQ-50×70 wet strong magnetic machine, set the background magnetic field strength to 5.0×10 5 A / m, for magnetic separation t...

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Abstract

Nickel sulfide in low-grade ores is mainly recycled by a flotation method, but the defect is that the content of MgO in concentrate is high. As magnesium-containing minerals are high in smelting point and poor in mobility, when the content of MgO in concentrate is higher than 6.5%, adverse effects such as furnace body nodulation and furnace body corrosion are brought to a follow-up novel flash smelting process of nickel. In order to solve a problem that the content of magnesium in concentrate is high during separating of magnesium-nickel containing minerals, the invention provides a method for lowering the content of magnesium in pentlandite concentrate. The method comprises the following steps: adding surface conditioning agents such as sodium hexametaphosphate into the pentlandite concentrate, and uniformly dispersing ore pulp by stirring; then, adding magnetic seeds and a surfactant, and stirring to ensure that the magnetic seeds and the pentlandite concentrate generate adhesion agglomeration; and performing magnetic separation, thereby obtaining the pentlandite concentrate with the content of magnesium being lower than 6.5% (in terms of MgO). The method disclosed by the invention has the advantages of being good in pentlandite separation selectivity, environmentally friendly, low in energy consumption, easy to operate, high in efficiency, and the like, and solves a problem that the content of magnesium in nickel concentrate is high.

Description

technical field [0001] The invention belongs to the field of mineral separation, and in particular relates to a method for reducing magnesium content in pentlandite concentrate. Background technique [0002] Nickel is a silver-white metal with magnetism, good plasticity and electrical conductivity. It is not easily corroded and is widely used in the manufacture of various special steels, heat-resistant and corrosion-resistant alloys, hard alloys, etc. It is an important metal related to the national economy and people's livelihood. Nickel exists mainly in the form of nickel sulfide ore, laterite nickel ore and seabed nodules in nature. Among them, nickel sulfide ore is the main source of nickel extraction at present. The typical nickel deposits in my country mainly include Jinchuan nickel mine in Gansu, Panshi nickel mine in Jilin, Kalatongke and Huangshan nickel mines in Xinjiang, and Lengshui cyanide nickel mine in Sichuan. Underground mining, with the continuous developme...

Claims

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Application Information

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IPC IPC(8): B03C1/01B03C1/02
Inventor 袁致涛李丽匣卢冀伟朱烁申帅平
Owner NORTHEASTERN UNIV
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