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Integrated approach to enriching nickel from nickel oxide laterite ore

A technology of nickel oxide ore and comprehensive method, which is applied in the field of nickel metallurgy, can solve problems such as difficult control of temperature control technology, difficulty in effective use of magnesium sulfate, and difficulty in meeting environmental protection requirements, so as to avoid the material pelletizing process and reduce energy consumption And the consumption of various materials, the effect of improving production efficiency and product quality

Inactive Publication Date: 2011-04-20
YUNNAN TIN GROUP HLDG
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Problems solved by technology

[0005] The ammonia leaching treatment process in the wet process is not suitable for the treatment of laterite nickel oxide ore with high copper and cobalt content, and is only suitable for the laterite ore on the surface; the pressure acid leaching process can achieve the highest recovery rate of nickel and cobalt, but only It is suitable for the treatment of lateritic nickel oxide ore with low magnesium content, because there are two major problems in the treatment of high magnesium ore, the consumption of sulfuric acid is too high and the use of magnesium sulfate is difficult to effectively use, which will directly affect its economic benefits and it is difficult to meet the increasingly stringent environmental protection requirements
[0006] The fire-wet combination process is suitable for processing any type of nickel oxide ore, and has low energy consumption and low production cost, but the current process technology is not stable enough, such as the mixing of pulverized coal and ore and the temperature control of the reduction roasting process are difficult to control
In addition, there are chlorine and hydrogen chloride pollution in segregation-mining, the production process is difficult to control, and the index fluctuates greatly.

Method used

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Experimental program
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Effect test

Embodiment 1

[0022] Embodiment 1: the chemical composition of magnesia laterite nickel oxide and ferrous laterite nickel oxide mixed ore raw material: Ni1.02~1.23%, Mg 12.01~16.02%, Fe 7.05~15.89%, Co 0.043~0.067%, Al3.21 ~ 4.88%, Si 2.01 ~ 15.96%.

[0023] A. Use a vertical mill to crush (after pretreatment) the raw ore (containing 15-20% structural water) containing surface water <5% to less than 0.5mm, and then add it to a multi-stage cyclone for drying, calcination and reduction, and spray it into The reduced coal powder accounting for 5% of the weight ratio of the raw ore is reduced and roasted, the temperature of the drying and calcining section is 700±50°C, the temperature of the reducing section is controlled at 950±50°C, and the reduction time is 0.5-1h.

[0024] B. The reduced material is quenched by water, and sent to a wet ball mill for grinding. The grinding concentration is controlled at 50-60%, and the grinding particle size reaches 200-320 mesh. A magnetic separator is use...

Embodiment 2

[0025] Embodiment 2: the chemical composition of magnesia laterite nickel oxide ore raw material: Ni 0.81~1.1%, Mg19.25~24.10%, Fe8.01~11.01%, Co0.021~0.03%, Al0.04~0.07%, Si15 .04~20.78%

[0026] A. Use a vertical mill to crush (after pretreatment) the raw ore (containing 15-20% structural water) containing surface water < 5% to less than 0.5mm, and then add it to a five-stage cyclone for drying, calcination and reduction, and spray it into The reduced coal powder accounting for 5% of the weight ratio of the raw ore is reduced and roasted, the temperature of the drying and calcining section is 750±50°C, the temperature of the reducing section is controlled at 900±50°C, and the reduction time is 0.5-1h.

[0027] B. The reduced material is quenched by water, and sent to a wet ball mill for grinding. The grinding concentration is controlled at 50-60%, and the grinding particle size reaches 200-320 mesh. A magnetic separator is used for sorting, and the magnetic field strength i...

Embodiment 3

[0030] Embodiment 3: the chemical composition of ferrous laterite nickel oxide ore raw material: Ni1.11~1.25%, Mg8.04~10.12%, Fe18.51~25.99%, Co0.061~0.081%, Al3.21~4.88%, Si2.01~15.96%.

[0031] A. Use a vertical mill to crush (after pretreatment) the raw ore (containing 15-20% structural water) containing surface water <5% to less than 0.5mm, and then add it to a multi-stage cyclone for drying, calcination and reduction, and spray into it at the same time The reduced coal powder accounting for 5% of the weight ratio of the raw ore is reduced and roasted, the temperature of the drying and calcining section is 700±50°C, the temperature of the reducing section is controlled at 950±50°C, and the reduction time is 0.5-1h.

[0032]B. The reduced material is quenched by water, and sent to a wet ball mill for grinding. The grinding concentration is controlled at 50-60%, and the grinding particle size reaches 200-320 mesh. A magnetic separator is used for sorting, and the magnetic f...

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Abstract

The invention relates to an integrated approach to enriching nickel from nickel oxide laterite ore, comprising the following steps of: breaking the nickel oxide laterite ore into 100-320-mesh specification by a vertical mill; and feeding into a multistage cyclone to successively dry, calcine and reduce; meanwhile, injecting coal, coke or carbon black solid reductant into the multistage cyclone for prereduction roasting, wherein the amount of the added coal, coke or carbon black solid reductant accounts for 1-13wt% of the nickel oxide laterite ore; circulating and returning smoke discharged by prereduction roasting back to the vertical mill for drying materials; carrying out water quenching and wet ore grinding to the reduced materials; and carrying out magnetic separation under the magnetic field intensity of 3000-5000 Gaussians to obtain nickel ore concentrates of which the grade is 5-15wt%. The method can be used for processing different types of nickel oxide laterite ore and has the characteristics of strong adaptability to raw materials, flexible production technology and products, high nickel and cobalt recovery rate, low energy consumption, environment-protection performance and the like.

Description

technical field [0001] The invention belongs to the technical field of nickel metallurgy, and in particular relates to a method for enriching nickel by reducing roasting in a multi-stage cyclone-magnetic separation. Background technique [0002] The lateritic nickel oxide ore is easy to mine, but it cannot be enriched by ore dressing. The smelting process is directly aimed at the raw ore, and the smelting scale is large. In addition, lateritic nickel oxide ore has complex components, many mineral types, low nickel and cobalt grades (Ni0.8-1.5%, Co<0.1%), and the metal minerals to be recovered (nickel oxide and cobalt oxide) are diffused and distributed in the ore. It is more difficult. Therefore, to solve the separation problem of iron-magnesium silicate in a large-scale smelting process, energy consumption and process costs will inevitably be increased. [0003] At present, there are roughly three types of nickel oxide ore treatment processes in the world, namely pyrot...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/00C22B1/02C22B3/04
CPCY02P10/20
Inventor 王炜董保生黄迎红董瀚潘基泽
Owner YUNNAN TIN GROUP HLDG
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