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Two-stage roasting mineral smelting integrated technique of laterite

A technology of laterite ore and nickel laterite, which is applied in the direction of wet separation, solid separation, chemical instruments and methods, etc., can solve the problems that cannot completely solve the problem of ring formation of materials, and the production situation is not very continuous and stable, so as to be easy to promote , low cost and high recovery rate

Active Publication Date: 2009-11-25
JILIN JIEN NICKEL IND +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because it uses a rotary kiln for roasting, even though it is automatically controlled by a computer system, it still cannot completely solve the problem of material ring formation, so its production is not very continuous and stable.

Method used

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  • Two-stage roasting mineral smelting integrated technique of laterite

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] a. Crush laterite, fluorite and coal to -3mm;

[0031] b. Add 5% coal powder and 5% fluorite powder according to the weight percentage of laterite ore and mix evenly;

[0032] c. Send it into the rotary kiln, control the roasting temperature in the high temperature zone to 1100°C, and the roasting time in the high temperature zone for 30 minutes, and control the material not to soften so that the rotary kiln does not form rings;

[0033] d. After exiting the kiln, the calcined sand enters the intermediate frequency heating device for two-stage roasting, so that the nickel and cobalt in the material are fully reduced, and the iron is partially reduced. The temperature is controlled at 1300°C to soften the material and flow out;

[0034] e. After the material is quenched in the water quenching tank, it is taken out and ground to a particle size of -200 mesh and 80%;

[0035] f, select concentrate ore under the magnetic field intensity of 2000 Oersted with magnetic separa...

Embodiment 2

[0038] a. Crush laterite, calcium oxide and coking coal powder to -2mm;

[0039] b. Add 5% pulverized coal and 10% calcium oxide according to the weight percentage of laterite ore, and then use a disc granulator to make pellets with a diameter of 10-15mm;

[0040] c. Send it into a rotary kiln, control the roasting temperature in the high temperature zone to 1250°C, and the roasting time in the high temperature zone for 60 minutes;

[0041] d. After leaving the kiln, the calcined sand enters the intermediate frequency heating device for two-stage roasting, so that the nickel and cobalt in the material are fully reduced, and the iron is partially reduced. The temperature is controlled at 1400 ° C to soften the material and flow out;

[0042] e. After the material is quenched in the water quenching tank, it is pulled out and then coarsely ground to -5mm, and the metal particles are selected by jigging to enter step g, and the tailings are finely ground to a particle size of -200...

Embodiment 3

[0046] a. Crush laterite, limestone, fluorite and oil shale to -3mm;

[0047] b. Add 5% oil shale, 5% limestone and 2.5% fluorite powder according to the weight percentage of laterite ore and mix them evenly, and then use a pair of roller pressing ball machines to make pellets with a diameter of 10-15mm;

[0048] c. Send it into the rotary kiln, control the roasting temperature in the high temperature zone to 1350°C, and the roasting time in the high temperature zone is 30min;

[0049] d. After leaving the kiln, the calcined sand enters the submerged arc furnace for two-stage roasting, so that the nickel and cobalt in the material are fully reduced, and the iron is partially reduced. After the material is softened by controlling the temperature at 1450°C, the calcined sand is released through the blanking flap;

[0050] e. After the material is quenched in the water quenching tank, it is taken out and ground to a particle size of -200 mesh 75%;

[0051] f, select concentrate ...

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Abstract

The present invention relates to a two-stage roasting mineral smelting integrated technique of laterite, and especially to the extracting and recovering of nickel, cobalt and iron in the low-grade nickel oxide ore. The laterite, additive and reducing agent are crushed into a granularity smaller than 5mm and are delivered into a rotary kiln for reduction roasting for a time period. The roasting temperature is controlled so that the material does not loop and is controlled lower than a softening temperature. After taking out from the kiln, the material is delivered into an intermediate-frequency heater for executing a two-stage roasting. The temperature is controlled so that the material flows out with a half-smelted state and enters into a water quenching pool for water quenching. After taking out and grinding, magnetic separation is executed for eliminating the non-magnetic impurity. Then the magnetic concentrate, namely the coarse ferronickel is obtained. The coarse ferronickel is refined with a conventional electric furnace for obtaining the ferronickel product. The aim of the invention is to process the laterite. The nickel, the cobalt and the iron are reduced to simple substances through reduction roasting. Then the nickel and the cobalt are separated along with the iron through the magnetic separation. The coarse ferronickel is generated and the ferronickel product is obtained after refining. The two-stage roasting mineral smelting integrated technique of laterite according to the invention has the advantages of simple technique, low cost, high recovery rate and easy generalization.

Description

Technical field: [0001] The invention relates to a non-ferrous metal smelting technology, which is a technology for producing ferronickel by combining pyrometallurgy and ore dressing technology on laterite ore to extract and recover nickel, cobalt and iron in the laterite ore. Background technique: [0002] About 30% of the global terrestrial nickel resources occur in sulfide ores, and 70% in laterite ores (nickel oxide ores). Currently only about 40% of global nickel production comes from laterite ores. With the acceleration of the development of laterite mine projects in the world in recent years, it is estimated that more than 50% of the global nickel production will come from laterite mines by 2012. Laterite ore has the characteristics of refractory mineral separation. Compared with nickel sulfide ore, laterite ore for smelting treatment has lower ore grade, higher smelting cost, and relatively poor development economy. [0003] The process of processing nickel oxide o...

Claims

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Application Information

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IPC IPC(8): C22B5/08C22B1/02B03B7/00C22C33/04C22C38/08
Inventor 孙士俊刘力勇李韧王学哲郭宏任洪胜张鸣昕马忠诚高晓艳袁凤艳刘光军
Owner JILIN JIEN NICKEL IND
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