Method for producing low nickel matte by smelting, reducing and vulcanizing nickel oxide ore

A technology for nickel oxide ore and nickel matte, applied in the field of nickel oxide ore smelting, can solve the problems of large installed load and high energy consumption of electric furnaces, and achieve the effects of small load, high vulcanization efficiency and stable properties

Pending Publication Date: 2021-08-24
CNGR ADVANCED MATERIAL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Rotary kiln pre-reduction-electric furnace smelting process is currently the mainstream process for smelting and producing ferronickel in the world. It can realize large-scale production. The quality of ferronickel products is excellent, but the energy consumption of electric furnace is high and the installed load is large.
[0006] With t...

Method used

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  • Method for producing low nickel matte by smelting, reducing and vulcanizing nickel oxide ore
  • Method for producing low nickel matte by smelting, reducing and vulcanizing nickel oxide ore
  • Method for producing low nickel matte by smelting, reducing and vulcanizing nickel oxide ore

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0053] The nickel oxide ore is dried and preheated in a rotary kiln, and the output temperature is 600 ℃ hot nickel oxide ore. The hot material produced by drying and preheating is screened by a grid, and the undersize is controlled to be less than 50mm. According to the ratio of nickel oxide ore: calcium carbonate = 10:1, the hot nickel oxide ore and the flux calcium carbonate are continuously added to the oxygen-rich molten pool smelting furnace from the furnace top, and at the same time according to nickel oxide ore: pulverized coal: sulfur = 100:18 : 2, inject the reducing agent pulverized coal and vulcanizing agent sulfur into the reaction area of ​​the molten pool through the furnace body, and inject oxygen-enriched air with an oxygen concentration of 85% at the same time, the oxygen-enriched air pressure is 0.2Mpa, and the oxygen excess coefficient is 0.3; Oxygen-enriched air with an oxygen concentration of 60% is injected into the upper gas phase space of the melt in th...

Embodiment 2

[0055] Compared with Example 1, other parameters are the same as in Example 1 except that the oxygen excess coefficient is controlled to be 0.35, which will not be repeated here. The sulfur content is 26.3%, the nickel metal recovery rate is 92.8%, the cobalt metal recovery rate is 82.6%, and the low matte metallization rate is 0.28. Reduced sulfide slag contains NiO: 0.12%, FeO: 17.37%, SiO 2 : 35.79%, CaO: 5.62%, MgO: 22.31%, Al 2 O 3 : 4.45%. The reduced sulfide fume is granulated and returned to smelting. Low nickel matte is intermittently released, and slag is continuously released for water quenching. The smelting flue gas enters the rotary kiln through the flue to dry and preheat the nickel oxide ore. The flue gas discharged from the outlet of the rotary kiln is dedusted by the bag filter and sent to the desulfurization system, so that the sulfur dioxide content in the flue gas meets the national emission standard.

Embodiment 3

[0057] Compared with Example 1, except that the oxygen excess coefficient is controlled to be 0.4, other parameters are the same as those of Example 1, which will not be repeated here. The low matte nickel produced by the reaction contains 28.8% nickel, 1.01% cobalt, and 41.58% iron. The sulfur content is 27.6%, the nickel metal recovery rate is 91.3%, the cobalt metal recovery rate is 80.2%, and the low matte metallization rate is 0.21. The reduced sulfide slag contains NiO: 0.13%, FeO: 17.52%, SiO 2 : 35.73%, CaO: 5.61%, MgO: 22.71%, Al 2 O 3 : 4.36%. The reduced sulfide fume is granulated and returned to smelting. Low nickel matte is intermittently released, and slag is continuously released for water quenching. The smelting flue gas enters the rotary kiln through the flue to dry and preheat the nickel oxide ore. The flue gas discharged from the outlet of the rotary kiln is dedusted by the bag filter and sent to the desulfurization system, so that the sulfur dioxide con...

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Abstract

The invention discloses a method for producing low nickel matte by smelting, reducing and vulcanizing nickel oxide ore. The method mainly comprises the following steps: drying and preheating the nickel oxide ore to produce thermal nickel oxide ore at the temperature of 600-900 DEG C; continuously adding the dried and preheated nickel oxide ore and flux into a melting pool of the melting furnace; spraying a reducing agent, a vulcanizing agent and oxygen-enriched air into a reaction zone of a molten pool in the smelting furnace, and controlling the oxygen excess coefficient alpha of the oxygen-enriched air to the reducing agent to be 0.3-0.4; and controlling the temperature in the furnace to be 1400-1550 DEG C, wherein the materials added into the furnace are subjected to a reduction vulcanization reaction in a molten state to produce low nickel matte and slag. The method is used for nickel oxide ore smelting, and has the characteristics of good environmental protection, short process, strong raw material adaptability, low production cost and the like.

Description

technical field [0001] The invention relates to the technical field of nickel oxide ore smelting, in particular to a method for one-step smelting of low nickel matte by smelting reduction and sulfidation of nickel oxide ore. Background technique [0002] Nickel is an important strategic metal with high temperature resistance, corrosion resistance and good ductility. It is widely used in stainless steel, electroplating and battery materials. Nickel ore resources are mainly nickel sulfide ore and nickel oxide ore. Nickel sulfide ore contains higher nickel and is easier to develop and utilize. With the reduction of nickel sulfide ore resources, the development and utilization of nickel oxide ore has become an inevitable trend. The global nickel oxide ore resources account for more than 70% of the total nickel ore, mainly distributed in Indonesia, New Caledonia, Cuba, the Philippines, Brazil, Colombia and Dominica near the equator. [0003] At present, the main processes for tr...

Claims

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Application Information

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IPC IPC(8): C22B5/10C22B5/08C22B23/02
CPCC22B5/10C22B5/08C22B23/021Y02P10/20
Inventor 陶吴刘燕庭訚硕冯德茂匡三双茹国生
Owner CNGR ADVANCED MATERIAL CO LTD
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