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A method for improving the selectivity of carbothermal reduction of laterite nickel ore

A laterite nickel ore and selective technology, applied in the metallurgical field, can solve the problems of limited promotion, unsatisfactory nickel-iron product quality, and lower nickel grade, etc., and achieve the effect of simple process flow, good nickel recovery effect, and improved grade effect.

Inactive Publication Date: 2016-08-31
CENT SOUTH UNIV
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Problems solved by technology

[0005] It is precisely because nickel needs to be efficiently enriched with iron as a carrier in the direct reduction-magnetic separation process, so a large amount of iron is reduced as a carrier in the reduction process. Although a good metal recovery rate can be obtained, the reduction of a large amount of iron is simultaneously Reduce the nickel grade in the product, and the quality of ferronickel products is not ideal, thus limiting the promotion of ferronickel products prepared by direct reduction-magnetic separation

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  • A method for improving the selectivity of carbothermal reduction of laterite nickel ore

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Embodiment 1

[0023] Fully mix the laterite nickel ore powder with a certain quality of sulfur-containing additives, and dry the agglomerates. Among them, the sulfur-containing additives contain sodium sulfate and sodium sulfide, and the total sulfur in the sulfur-containing additives and the total iron in the laterite nickel ore The mass ratio of the sulfur-containing additive is 0.15; the ratio of the mass of sodium sulfate and sodium sulfide to the total mass of the sulfur-containing additive is 0.6. Roasting at 1050°C for 60 minutes in a reducing atmosphere with a CO mass percentage of 40% yields a reduced product. After cooling, the reduced product is crushed and ground until 90% of it is smaller than 74nm, and then separated by magnetic separation. According to the test and analysis, the sulfidation rates of nickel and iron in the reduction products are 4.35% and 20.42% respectively, and the metallization rates of nickel and iron are 91.78% and 70.69% respectively. The grades of nicke...

Embodiment 2

[0025] Fully mix the laterite nickel ore powder with a certain quality of sulfur-containing additives, and dry the agglomerates. Among them, the sulfur-containing additives contain sodium sulfate, and the mass ratio of the total sulfur in the sulfur-containing additives to the total iron in the laterite nickel ore is 0.20; the ratio of the mass of sodium sulfate in the sulfur-containing additive to the total mass of the sulfur-containing additive is 0.8. Roasting at 1050°C for 60 minutes in a reducing atmosphere with 50% CO by mass, the reduced product was obtained. After cooling, the reduced product was crushed and ground until 90% of it was smaller than 0.074mm, and then separated by magnetic separation. According to the test and analysis, the sulfidation rates of nickel and iron in the reduction products are 4.82% and 25.23% respectively, and the metallization rates of nickel and iron are 90.96% and 66.85% respectively. The grades of nickel and iron in the obtained ferronic...

Embodiment 3

[0027] Fully mix the laterite nickel ore powder with a certain quality of sulfur-containing additives, and dry the agglomerates. Among them, the sulfur-containing additives contain sodium sulfide, and the mass ratio of the total sulfur in the sulfur-containing additives to the total iron in the laterite nickel ore is 0.23; the ratio of the mass of sodium sulfide to the total mass of sulfur-containing additives is 1.0. Roast at 1050°C for 50 minutes in a reducing atmosphere with a CO mass percentage of 50% to obtain a reduced product. After cooling, the reduced product is crushed and ground until 90% of it is less than 74nm, and is separated by wet weak magnetic separation. According to the test and analysis, the sulfidation rates of nickel and iron in the reduction products are 5.02% and 27.16% respectively, and the metallization rates of nickel and iron are 92.14% and 64.05% respectively. The grades of nickel and iron in the obtained ferronickel product are 12.05% and 81.46% ...

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Abstract

The invention discloses a method for improving laterite-nickel ore carbothermic reduction selectivity. A sulfur-containing assistant is added in laterite-nickel ore and the mixture is subjected to carbothermic reduction-sorting process so that a nickel-iron product is obtained. Through action of the sulfur-containing assistant, based on an appropriate carbothermic reduction process, nickel oxide in the laterite-nickel ore is reduced into metallic nickel, iron oxide is reduced into metallic iron and other parts are bonded to sulfur in the assistant so that ferrous sulfide is obtained. The method realizes nickel and iron selective reduction / sulfuration in laterite-nickel ore carbothermic reduction, greatly improves a nickel grade of the reduced product nickel-iron, produces a high-quality nickel-iron product, satisfies requirements on stainless steel smelting raw materials, has the characteristics of strong raw material adaptability, simple processes, good product quality, low treatment cost and good nickel recovery effects, and provides a novel direction for future high-efficiency and low-cost treatment on laterite-nickel ore.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a method for improving the carbothermal reduction selectivity of laterite nickel ore. Background technique [0002] With the depletion of high-quality nickel sulfide ore resources, laterite nickel ore will be the main source of nickel supply. At present, the direct reduction method has become a popular research method for processing laterite nickel ore. Among them, the rotary kiln granulated iron method (Dajiangshan method) is currently the only industrial application method in the world that uses a rotary kiln to process laterite nickel ore. The advantages of this process are short process, low energy consumption, low production cost, and adaptability to ore wide. But at the same time, there are also problems such as harsh process conditions, difficult operation and control, and easy formation of rings in the kiln during the production process, which limits the popularizati...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B23/02C22B5/12C22B5/06
Inventor 李光辉姜涛罗骏饶明军张元波张鑫范晓慧李骞陈许玲彭志伟郭宇峰黄柱成杨永斌朱忠平梁斌珺游志雄贾浩徐斌
Owner CENT SOUTH UNIV
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