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Method for smelting oxide ore

A smelting method and oxide technology, which is applied in the field of dry smelting of oxide ores, can solve the problems of difficulty in stacking lumps, increased cost, and low processing efficiency

Pending Publication Date: 2021-04-02
SUMITOMO METAL MINING CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In addition, when the diameter of the agglomerate is limited within a certain range like the technique described in Patent Document 1, the yield of the agglomerate is inevitably lowered, and as a result, the cost may increase.
It should be noted that when the laying density of the agglomerates is in the range of 0.5 to 0.8, not only is it not densely filled, but also it becomes difficult to stack the agglomerates, so the processing efficiency is low

Method used

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  • Method for smelting oxide ore
  • Method for smelting oxide ore
  • Method for smelting oxide ore

Examples

Experimental program
Comparison scheme
Effect test

no. 1 approach

[0057] figure 1 It is a process chart showing the process flow of the nickel oxide ore smelting method. Such as figure 1 As shown, the method for smelting nickel oxide ore in this embodiment (first embodiment) includes: a mixing step S1 of mixing raw materials of nickel-containing oxide ore; a drying step S2 of drying the obtained mixture; A reduction step S3 in which the mixture is heated to a predetermined reduction temperature and then reduced; and a recovery step S4 in which the metal and slag obtained as a reduction product are separated and the metal is recovered.

[0058] [mixing process]

[0059] The mixing step S1 is a step of mixing raw material powders of nickel-containing oxide ore to obtain a mixture. Specifically, in the mixing step S1, nickel oxide ore as a raw material ore is mixed with a carbonaceous reducing agent, and iron ore, a flux component, a binder, etc. Powders with a diameter of about 0.1 mm to 0.8 mm were mixed to obtain a mixture.

[0060] At ...

Embodiment approach

[0105] image 3 It is a process chart showing the flow of the method for smelting nickel oxide ore according to the second embodiment. Such as image 3 As shown, in the smelting method of the second embodiment, unlike the smelting method of the first embodiment, the drying process and the reducing process are performed together.

[0106] Specifically, the method for smelting nickel oxide ore according to the second embodiment includes: mixing process S11, mixing raw materials of nickel oxide ore; drying and reducing process S12, putting the obtained mixture into a reduction furnace for drying treatment and performing a reduction treatment; and a recovery step S13 of separating the obtained metal and slag as a reduction product and recovering the metal.

[0107] It should be noted that since the mixing step S11 and the recovery step S13 respectively correspond to the mixing step S1 and the recovery step S4 in the smelting method of the first embodiment and perform the same pr...

Embodiment 1

[0120] >

[0121] (mixing process)

[0122] Nickel oxide ore and iron ore as raw material ores, silica sand and limestone as flux components, binder and carbonaceous reducing agent (coal powder, carbon content: 82% by mass, average particle size: about 65 μm), The mixture was obtained by mixing using a mixer while adding an appropriate amount of water. It should be noted that, regarding the carbonaceous reducing agent, nickel oxide (NiO) and iron oxide (Fe 2 o 3 ) is contained at a ratio of 27% by mass when the amount required for reduction without excess or deficiency is 100% by mass.

[0123] (drying process, reduction process)

[0124] In Example 1, the obtained mixture was directly loaded into the drying equipment without molding and dried at a temperature above 180° C. for 1 hour, and the dried mixture was charged into a reduction furnace with a burner (combustion furnace )middle. A gas burner using gas fuel is used as the burner. In the combustion furnace, the cha...

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Abstract

The purpose of the present invention is to provide a method for smelting oxide ore, the method being capable of efficiently producing high quality metal. The present invention pertains to a smelting method for producing a metal such as ferronickel as a reduced product by reducing a mixture of a carbonaceous reducing agent and an oxide ore such as nickel oxide ore, the method comprising a reductionstep in which the mixture is charged into a reduction furnace and the oxide ore is reduced by heating the mixture with a burner to obtain molten metal and slag. In the reduction step, the molten metal and the slag generated by reducing the oxide ore are separated by gravity separation. In the reduction step, it is preferable to heat the mixture such that the temperatures of the metal and the slagobtained in the reduction furnace are each in the range of 1300-1700 DEG C.

Description

technical field [0001] The present invention relates to a dry-type smelting method of oxide ores, and more specifically, relates to a method for producing a reduced product by using oxide ores such as nickel oxide ores as raw materials and reducing them with a carbonaceous reducing agent. Metal smelting methods. Background technique [0002] As a method of smelting nickel oxide ore called limonite or saprolite, which is a type of oxide ore, there are known dry smelting methods for producing nickel matte using a smelting furnace, and producing iron matte using a rotary kiln or a mobile hearth furnace. The dry smelting method of ferronickel (Ferronickel), which is an alloy with nickel, and the wet smelting method of producing mixed sulfide mixed with nickel and cobalt by acid leaching under high temperature and high pressure conditions in an autoclave, etc. [0003] Among the various methods described above, especially in the case of reducing and smelting nickel oxide ore usi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B23/02C21B13/00C22B5/10C22C33/04
CPCC22B5/10C22C33/04C22C1/023C22B23/023C22B1/243Y02P10/20Y02P10/134
Inventor 井关隆士
Owner SUMITOMO METAL MINING CO LTD
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