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Method for producing high-nickel-grade nickel-iron powder by laterite-nickel ore autocatalytic reduction

A technology for laterite nickel ore and nickel-iron powder, which is applied in the field of comprehensive utilization of mineral resources, can solve the problems of increased production cost, waste of resources, unexplained tailings treatment in roughing and selection operations, etc., so as to reduce emissions and reduce consumption. , The effect of process environmental protection

Active Publication Date: 2014-10-08
UNIV OF SCI & TECH BEIJING
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Problems solved by technology

Although the use of these additives has the above advantages, it also increases the production cost
[0004] At the same time, in previous patents or papers, researchers usually use one or more stages of grinding and magnetic separation to obtain the final reduced ferronickel powder for the roasted products, but there is no explanation for the treatment of tailings in roughing and beneficiation operations
About 15-20% of the nickel is lost in the tailings, and the nickel in this part of the tailings mainly exists as tiny metal nickel-iron particles, but because the particle size is extremely fine (usually below 10 μm), it is difficult to Be caught and enter the tailings, resulting in a waste of resources

Method used

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  • Method for producing high-nickel-grade nickel-iron powder by laterite-nickel ore autocatalytic reduction

Examples

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Effect test

Embodiment 1

[0016] A lateritic nickel ore contains 34.69% iron and 1.49% nickel. The raw ore is crushed to -2mm to account for 100%, add 5% reducing agent coal, add 10% sodium sulfate, add about 11% water and mix well, press the ball on the double-roller briquetting machine, and the obtained carbon-containing pellets are anti-fall The average strength is 7 times / piece, and the compressive strength is 48N / piece; the dry ball drop strength after drying is 9 times / piece, and the compressive strength is 360N / piece. Then it was reduced and calcined at 1200°C for 50 min in a muffle furnace. After the roasted ore is cooled, it is first crushed to -2mm, and then it is ground and sorted in stages. The first stage grinding concentration is 68%, and the fineness is -0.074mm, accounting for 65%. The second stage grinding concentration is 62%, and the fineness is - 0.074mm accounts for 95%, and the strength of the two magnetic separation fields is 89.6kA / m. Finally, the nickel grade is 9.82%, the ni...

Embodiment 2

[0019] A lateritic nickel ore contains 26.68% iron and 1.46% nickel. The raw ore is crushed to -1mm to account for 100%, add 5% reducing agent coal, use 5% lime and 10% sodium sulfate as a mixed desulfurizer, add 10% water, mix and briquette on a double-roller briquetting machine. The average drop strength of the obtained carbon-containing pellet green balls is 7 times / piece, and the compressive strength is 50N / piece; after the pellets are dried, the drop strength is 9 times / piece, and the compressive strength is 156N / piece. Put the carbon-containing pellets in a muffle furnace for reduction roasting at 1150°C for 50 minutes; after the roasted ore is cooled, it is first broken to -2mm, and then it is ground and sorted in stages. The concentration of the first stage of grinding is 65%, and the fineness is -0.074 mm accounts for 65%, the second stage grinding concentration is 60%, the fineness is -0.074mm and accounts for 95%, and the magnetic separation field strength of the tw...

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Abstract

The invention provides a method for producing high-nickel-grade nickel-iron powder by laterite-nickel ore autocatalytic reduction, belonging to the field of comprehensive utilization of mineral resources. The method comprises the following steps: proportionally mixing powdery laterite-nickel ores, a reducer and an adhesive, pelletizing, carrying out reduction roasting on the carbonous pellets at high temperature, cooling, carrying out multistage grinding, carrying out low-intensity magnetic separation, carrying out medium-intensity scavenging on the magnetic tailings, and returning the scavenger concentrate to the raw ores for pelletizing. The returned product has the characteristic of small particle size and contains a small amount of nickel-iron metal particles; and the returned product has the following functions: the fine particles are filled in the slits among the coarse particles, thereby enhancing the pellet strength in the pelletizing process; and in the roasting process, the metal iron promotes the reduction of nickel through the catalytic coal gasification, and is used as the nucleating agent of the newly generated metal nickel-iron particles to promote the accumulation and growth of the metal nickel-iron particles. Compared with the existing coal-base direct reduction-magnetic separation technique, the method provided by the invention has the advantage of obviously higher nickel recovery rate and nickel grade, wherein the nickel recovery rate is up to 90%, and the nickel grade can reach more than 10%.

Description

technical field [0001] The invention relates to the field of comprehensive utilization of mineral resources, in particular to a method for producing high-nickel-grade ferronickel powder by autocatalytic reduction of laterite nickel ore. Background technique [0002] In recent years, with the rapid consumption of easy-to-select nickel sulfide resources, the global nickel industry has shifted the focus of resource development to laterite nickel ore (low-grade nickel oxide ore) resources with abundant reserves. The traditional limonite-type laterite-nickel ore wet treatment mainly includes high-pressure acid leaching, reduction roasting-ammonia leaching, and atmospheric pressure acid leaching; Nickel matte and other processes. These traditional processes have the problems of high energy consumption or low efficiency. In order to find a new and more effective laterite nickel ore treatment method, domestic scholars have recently developed a laterite nickel ore reduction roastin...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B23/02B03C1/02
Inventor 孙体昌刘志国寇珏王晓平于春晓
Owner UNIV OF SCI & TECH BEIJING
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