Preparation process of low-grade laterite nickel ore oxidized pellet

A technology of lateritic nickel ore and oxidized pellets, which is applied in the field of preparation of low-grade laterite nickel ore oxidized pellets, can solve the problems of blast furnace antegrade and high yield, short construction period, small investment, etc., and achieve low compressive strength , promote liquid phase bonding, improve the effect of compressive strength

Active Publication Date: 2013-01-09
北京中宏联工程技术有限公司
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AI Technical Summary

Problems solved by technology

[0003] At present, the processing methods of lateritic nickel ore put into production in the world are as follows: the most important process used in the pyrotechnic process is the reduction smelting nickel-iron process, and the reactors used include electric furnace and blast furnace. Other major pyrotechnic processes include Krupp process, rotary kiln-electric furnace smelting, reduction smelting ferronickel outside the furnace and other processes, but lateritic nickel ore is required to have a higher grade, and is required to be lump ore or sintered ore; the ammonia leaching process in the wet process is only suitable for treating the surface layer For laterite nickel ore, although the high-pressure acid leaching (HPAL) process has been industrialized and industrialized, it is difficult to popularize because it operates under high-pressure conditions and has high requirements for equipment, scale, investment, operation control and ore grade; The fire-wet method combined process is relatively simple, the investment is small and the construction period is short, which is suitable for small and medium-sized enterprises, but the technical difficulties lie in high energy consumption and comprehensive recovery of metals
Some domestic enterprises use the method of blast furnace smelting to prepare nickel-containing molten iron to utilize laterite nickel ore, but the blast furnace charge is mainly prepared by sintering, the output of the sintering machine is low, and the strength of the sinter is low, which seriously affects the smooth operation and high production of the blast furnace
At present, there is no precedent in the world where laterite nickel ore is prepared into pellets and supplied to the blast furnace for ferronickel smelting

Method used

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  • Preparation process of low-grade laterite nickel ore oxidized pellet

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] see figure 1 , dry the low-grade laterite nickel ore until the water content is 12%, and crush it to -3mm with a roller crusher; 45% laterite nickel ore, 34.3% iron concentrate, 15% chromite, 5.7% calcium Under the conditions of raw material ratio, when the water content of the mixture is 10%, the pressure is 0.67N / mm 2 After the high-pressure roller mill pretreatment, pelletize on the disc pelletizer, the pelletizing water is 12.2%, pelletizing time is 12min, the particle size of the pellets is controlled at 12mm; the drop strength of the pellets is 13.3 times / 0.5m, the additive formula: limestone : quartz sand: borax=58%: 27%: 15%, the particle size is less than 0.074mm and the content reaches more than 85%; under the conditions of pellet preheating temperature 1100°C, preheating time 13min, roasting temperature 1220°C, roasting time 13min, the preparation The finished product pellets have a compressive strength of 1915N / piece.

Embodiment 2

[0018] see figure 1 , dry the low-grade laterite nickel ore until the water content is 13%, and crush it to -3mm with a double-roller crusher; Under the conditions of raw material ratio, when the water content of the mixture is 10%, the pressure is 0.77N / mm 2 After pretreatment by high-pressure roller mill, pelletize on a disc pelletizer, the pelletizing moisture is 12.5%, the pelletizing time is 14min, and the particle size of the green pellets is controlled at 14mm; the drop strength of the green pellets is >20 times / 0.5m. Additive formula: limestone: quartz sand: borax = 62%: 23%: 15%, the particle size is less than 0.074mm and the content reaches more than 85%; the preheating temperature of the pellets is 1000, the preheating time is 15min, the roasting temperature is 1280, and the roasting time is 15min. Under these conditions, the finished pellets were prepared with a compressive strength of 2326N / piece.

Embodiment 3

[0020] see figure 1 , dry the low-grade laterite nickel ore until the water content is 11%, and crush it to -3mm with a roller crusher; 45% laterite nickel ore, 35% iron concentrate, 15% chromite, 5.0% calcium additive Under the conditions of raw material ratio, when the water content of the mixture is 10%, the pressure is 0.57N / mm 2 After pretreatment by high-pressure roller mill, pelletize on a disc pelletizer, pelletizing water is 12.3%, pelletizing time is 10min, particle size of green pellets is controlled at 15mm; green pellet drop strength is 13.3 times / 0.5m, additive formula: limestone : quartz sand: borax=60%: 27%: 13%, the particle size is less than 0.074mm and the content reaches more than 85%; under the conditions of pellet preheating temperature 1050, preheating time 12min, roasting temperature 1240, roasting time 12min, the preparation The finished product pellets have a compressive strength of 1900N / piece.

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Abstract

The invention discloses a preparation process of a low-grade laterite nickel ore oxidized pellet. The preparation method comprises the following steps: drying low-grade laterite nickel ore until the moisture content of the laterite nickel ore is 11-13%, and crushing the laterite nickel ore with a double-roll crushing mill until the grain size of the laterite nickel ore is minus 3mm; evenly mixinglaterite nickel ore, iron ore concentrate, chromite and a calcium-containing additive in a mass proportion of (45-50%):(30-35%):15%:(5.0-7.7%); carrying out high-pressure rolling pretreatment on the mixed material; pelletizing on a disk pelletizing machine, wherein the moisture content of fresh pellet is 12-12.5%, and the grain size of the fresh pellet is controlled to 12-16mm; and carrying out drying preheating and roasting on the fresh pellet in a chain gate and a rotary kiln or a belt type roasting machine so as to obtain the finished product oxidized pellet, wherein the preheating temperature is 1000-1100 DEG C, the preheating time is 12-15 minutes, the roasting temperature is 1220-1280 DEG C, and the roasting time is 12-15 minutes. The invention relates to the preparation process of the low-grade laterite nickel ore oxidized pellet with high finished product pellet compression strength and wide roasting temperature range when the laterite nickel ore is used for production of pellets.

Description

technical field [0001] The invention relates to a preparation process of laterite nickel ore oxidized pellets, in particular to a preparation process of low-grade laterite nickel ore oxidized pellets. Background technique [0002] Nickel and chromium are the main alloying elements for smelting stainless steel. About 63% of the world's nickel is used to produce stainless steel, so the stainless steel industry has the largest impact on nickel consumption. Currently, only land-based nickel sulfide ore and lateritic nickel ore are the only nickel resources that can be developed and utilized by humans, of which about 30% are Sulfide ore, 70% is oxide ore, while nickel sulfide ore provides 60% of all nickel metal production. Laterite nickel ore resources are surface weathered crustal deposits formed by weathering-leaching-deposition of nickel sulfide ore rock mass, and are loose clay-like ores composed of iron, aluminum, silicon and other hydrous oxides. Although the reserves of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/243
Inventor 潘建朱德庆李启厚周仙霖张金良
Owner 北京中宏联工程技术有限公司
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