Technique for roasting and dressing laterite nickel ore

A technology of laterite nickel ore and process method, which is applied in the field of laterite nickel ore treatment and beneficiation, double kiln roasting-mineralization treatment of laterite nickel ore, which can solve the problems of difficult post-processing, large amount of chlorinating agent, and high roasting temperature. Achieve the effects of strong equipment reliability, strong raw material adaptability, and simple process flow

Inactive Publication Date: 2009-09-23
张建宏 +6
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AI Technical Summary

Problems solved by technology

The disadvantages of this method are: (1) the amount of chlorinating agent used is too large, which increases the operating cost and causes difficulties in tail gas treatment; (2) the high roasting temperature easily causes ring formation in the rotary kiln
[0009] The above two patented technologies draw on the process principle of direct reduction iron production, and adopt the method of reduction roasting to process laterite nickel ore. Due to the high roasting temperature, most of the iron is also reduced during the roasting process, resulting in post-processing difficulties. The selected nickel concentrate The ore grade is low, and it is difficult to process lateritic nickel ore with high iron content

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  • Technique for roasting and dressing laterite nickel ore

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Effect test

Embodiment 1

[0025] The lateritic nickel ore contains 0.94% nickel, 0.06% cobalt, and 50.14% iron. The ore is roasted at 750°C for 30 minutes in the first rotary kiln, and the calcine is cooled and then ground. The ground calcine is mixed with 4 % coke powder and 6% calcium chloride are mixed into pellets, the diameter of the pellets is 6-12mm, the pellets are dried at 150°C for 1 hour, and the dry pellets are roasted in the second rotary kiln at a roasting temperature of 900°C to control the low oxygen content in the tail gas 2%, roasting time 50 minutes, water quenching and grinding after calcined sand is released, and the pulp is separated by a magnetic separator with medium magnetic field strength. The nickel concentrate contains 11.2% nickel, 0.65% cobalt, and the nickel recovery rate is 80%. The concentrate is flotation, and the nickel content of the concentrate after flotation is 18.0%; the tailings are separated by strong magnetic separator, shaker and flotation machine, and the iro...

Embodiment 2

[0027] The lateritic nickel ore contains 1.42% nickel and 22.50% iron. The ore is roasted at 600°C for 20 minutes in the first rotary kiln, and the calcine is cooled and then ground. The ground calcine is mixed with 6% charcoal powder, 10 % Calcium chloride dihydrate mixed pellets, pellet diameter 10-12mm, pellets were dried at 150°C for 1 hour, dry pellets were put into the same rotary kiln for roasting, roasting temperature was 1000°C, and the oxygen content in the tail gas was controlled to be less than 2% , the roasting time is 120 minutes, water quenching and grinding after the calcined sand is released from the furnace, the pulp is separated by a magnetic separator with a medium magnetic field strength, the nickel concentrate contains 16.7% nickel, and the nickel recovery rate is 85%; the concentrate is flotation, floatation The nickel content of the concentrated ore after beneficiation is 24.3%.

Embodiment 3

[0029] The lateritic nickel ore contains 1.85% nickel and 12.83% iron. The ore is roasted in the first rotary kiln at 900°C for 90 minutes. After the calcine is cooled, it is ground. % Sodium chloride mixed pellets, pellet diameter 10-20mm, pellets dried at 150°C for 1 hour, dry pellets into the second rotary kiln for roasting, roasting temperature 1100°C, control the oxygen content in the tail gas to less than 2%, roasting The time is 180 minutes. After the calcined sand is released from the furnace, it is water quenched and ground, and the pulp is separated by a magnetic separator with a medium magnetic field strength. The nickel content of the nickel concentrate is 22.9%, and the nickel recovery rate is 86%. The concentrate is flotation, and after flotation The concentrate contains 31.2% nickel.

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Abstract

The invention relates to a technique for roasting and dressing laterite nickel ore. The technique comprises the following steps that: raw ore is crushed, sieved and then roasted for the first time by use of a kiln; cold roasted sand powder is ground into fine powder; the fine powder is mixed well with carbonaceous additives and chlorinating agents and then pelletized to be pellets in a disk pelletizer; the pellets are dried by use of afterheat flue gas of the kiln and then enter a second kiln so as to be roasted; neutral or weak reducing atmosphere is adopted in the roasting process to inhibit the reduction of iron in laterite ore; roasting temperature is controlled below soft melting temperature; the roasted pellets are quenched with water under an airtight condition; water-quenched roasted sand is ground and then dressed so as to obtain nickel-cobalt concentrate; iron in tailings is recovered through high intensity magnetic separation and gravity separation; tail gas of a pellet-roasting kiln is subjected to vortex dust collection, neutralized with lime mortar and concentrated and then passes through a washing tower; and most of chlorinating agents are recovered after water-film dust removal. The technique is characterized by strong raw-material adaptability, simple process flow, low cost, environment-friendly property and the like.

Description

technical field [0001] The invention relates to a different type of laterite nickel ore processing and ore dressing method, in particular to a double kiln roasting-mineral processing process for laterite nickel ore, which belongs to the field of non-ferrous metals. Background technique [0002] Laterite nickel ore accounts for about 70% of the world's terrestrial nickel reserves. With the reduction of nickel sulfide ore resources, laterite nickel ore will become the main resource for obtaining nickel, especially in recent years. developed rapidly. [0003] The known metallurgical methods of lateritic nickel ore are divided into wet method and fire method. The wet method is mainly high-pressure acid leaching and reduction roasting-ammonia leaching technology, and the fire method is mainly smelting high-nickel iron in submerged heat electric furnace. The above methods all use the raw ore to directly enter the metallurgical process. Because the nickel content of the laterite n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B1/02C22B1/14C22B23/00
CPCY02P10/20
Inventor 张建宏谢永巨李建斌张国义张奇文邹小勇郝钢
Owner 张建宏
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