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A method for reducing magnesium content in pentlandite concentrate

A technology for pyrite and magnesium content, applied in the field of mineral separation, can solve the problems of high MgO content, high energy consumption, waste of resources, etc., meet the requirements of the quality of nickel raw materials, increase specific surface area, and reduce repulsion energy Effect

Active Publication Date: 2016-04-20
NORTHEASTERN UNIV LIAONING
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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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  • A method for reducing magnesium content in pentlandite concentrate

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Experimental program
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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 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 ore slu...

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 recovered through flotation, but its disadvantage is that the MgO content in the concentrate is high. Due to the high melting point of magnesium-containing minerals, the fluidity is poor. When the MgO content in the concentrate is higher than 6.5% , which will bring adverse effects such as furnace body nodulation and furnace body corrosion to the subsequent new nickel flash smelting process. Aiming at the problem of high magnesium content in magnesium-containing nickel ore sorting concentrates, the present invention provides a method for reducing the magnesium content in pentlandite concentrates. In this method, surface adjusters such as sodium hexametaphosphate are added to the pentlandite concentrate, and the slurry is evenly dispersed through stirring; magnetic seeds and surfactants are then added, and after stirring, the magnetic seeds and the pentlandite concentrate are Adhesion agglomeration occurs; and through magnetic separation, a pentlandite concentrate with a magnesium content of less than 6.5% calculated as MgO is obtained. This method has the advantages of good selectivity for nickel pyrite minerals, environmental protection, low energy consumption, easy operation, and high efficiency, and solves the problem of high magnesium in nickel concentrate.

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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Patent Type & Authority Patents(China)
IPC IPC(8): B03C1/01B03C1/02
Inventor 袁致涛李丽匣卢冀伟朱烁申帅平
Owner NORTHEASTERN UNIV LIAONING
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