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A method for preparing ferronickel by strengthening the direct reduction process of laterite nickel ore

A laterite nickel ore and direct technology, applied in the field of metallurgy, can solve problems such as the difficulty of separating ferronickel and tailings, and achieve the effects of promoting aggregation growth, strengthening separation, and improving mass transfer process

Active Publication Date: 2020-02-21
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the problems such as the difficulty in separating ferronickel and tailings in the direct reduction process of laterite nickel ore, the present invention provides a method for preparing ferronickel by strengthening the direct reduction process of laterite nickel ore, which can significantly improve the separation effect of ferronickel and nickel Good recycling effect

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  • A method for preparing ferronickel by strengthening the direct reduction process of laterite nickel ore
  • A method for preparing ferronickel by strengthening the direct reduction process of laterite nickel ore

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Embodiment 1

[0033] The laterite nickel ore powder is fully mixed with a certain quality of flux and reducing agent, and the agglomeration is dried. Among them, the flux is quicklime, and the amount of calcium oxide is 10% of the mass of laterite nickel ore; the reducing agent is lignite, and the reducing agent The mass ratio of medium fixed carbon to total iron in laterite nickel ore is 0.35. The agglomerates were calcined at 1200°C for 3 hours in a rotary kiln to obtain reduced products. It is measured that the mass ratio of the liquid phase to the material during the roasting process is about 23%. After water quenching, the reduction product is crushed and ground until 90% of it is smaller than 74 μm, and then separated by magnetic separation. The grades of nickel and iron in the obtained ferronickel product are 7.1% and 82.3% respectively, and the recovery rates of nickel and iron are 82.3% and 81.9% respectively. Compared with the comparative example, the grades and recovery rates o...

Embodiment 2

[0035]Fully mix the laterite nickel ore powder with a certain mass of flux and reducing agent, and dry the agglomerates, wherein the flux is quicklime, and the amount of calcium oxide added is 15% of the mass of laterite nickel ore; the reducing agent is lignite, and the reducing agent The mass ratio of medium fixed carbon to total iron in laterite nickel ore is 0.35. The agglomerates were calcined at 1200°C for 3 hours in a rotary kiln to obtain reduced products. It is measured that the mass ratio of the liquid phase to the material during the roasting process is about 28%. After water quenching, the reduction product is crushed and ground until 90% of it is smaller than 74 μm, and then separated by magnetic separation. The grades of nickel and iron in the obtained ferronickel product are 7.6% and 85.2% respectively, and the recovery rates of nickel and iron are 85.3% and 87.1% respectively. Compared with the comparative example, the grades and recovery rates of nickel and ...

Embodiment 3

[0037] Fully mix the laterite nickel ore powder with a certain mass of flux and reducing agent, and dry the agglomerates, wherein the flux is quicklime, and the amount of calcium oxide added is 15% of the mass of laterite nickel ore; the reducing agent is lignite, and the reducing agent The mass ratio of medium fixed carbon to total iron in laterite nickel ore is 0.35. The agglomerate was calcined at 1250°C for 3 hours in a rotary kiln to obtain a reduced product. It is measured that the mass ratio of the liquid phase to the material during the roasting process is about 35%. After water quenching, the reduction product is crushed and ground until 90% of it is smaller than 74 μm, and then separated by magnetic separation. The grades of nickel and iron in the obtained ferronickel product are 8.0% and 87.8% respectively, and the recovery rates of nickel and iron are 88.2% and 89.0% respectively. Compared with the comparative example, the grades and recovery rates of nickel and ...

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Abstract

The invention discloses a method for preparing ferro-nickel through a reinforced laterite nickel ore direct reduction technique. An alkaline flux is added to laterite nickel ore according to a certainmass proportion, and ferro-nickel products are prepared through a rotary kiln direct reduction technique. In the reduction roasting technique, the component contents of calcium oxide and ferrous oxide in laterite nickel ore are controlled through the combined action of the flux and a reduction agent, proper low-melting-point eutectic phases are generated, and the reduction roasting temperature ofa rotary kiln is lowered; and the liquid-phase formation amount in the reduction process is increased, the mass transfer process between ferro-nickel particles is improved, aggregation growth of theferro-nickel particles is promoted, and thus the separation effect of the magnetic ferro-nickel products and non-magnetic tailings is reinforced. Through the method, the operation temperature of the rotary kiln can be lowered by 200 DEG C, the recovery rate of nickel and iron is greatly increased, and the nickel and iron separation effect is obviously improved.

Description

technical field [0001] The invention discloses a method for preparing ferronickel by strengthening the direct reduction process of laterite nickel ore, belonging to the technical field of metallurgy. Background technique [0002] Global land-based nickel ore resources are divided into nickel sulfide ore and laterite nickel ore. Among them, nickel sulfide ore accounts for about 40%, and the remaining 60% is laterite nickel ore. Limited by lateritic nickel ore dressing and smelting technology, nickel sulfide ore was the main source of nickel production for a long period of time in the past. High-grade nickel sulfide ore was used as raw material to produce nickel-containing products to meet the demand for nickel in various industries. With the continuous consumption of explored nickel sulfide ore and the continuous reduction of newly explored nickel sulfide ore reserves, the exploitable nickel sulfide ore resources worldwide are increasingly depleted, making it difficult to me...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C21B13/00
CPCC21B13/006C22B23/023
Inventor 李光辉罗骏饶明军姜涛彭志伟张元波张鑫
Owner CENT SOUTH UNIV
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