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Method for treating laterite-nickel ore surface ore through three-stage reduction method

A technology of laterite nickel ore and reduction method, applied in the field of iron and steel smelting, can solve the problems of unbearable slag volume, inability to remove direct reduced iron, limited usage, etc., to achieve waste recycling, avoid high coke ratio problems, The effect of increasing the added value of the process

Active Publication Date: 2020-11-10
王萍 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The smelting process with high coke ratio also leads to the high sulfur and phosphorus content of low ferronickel produced, and the iron products produced are relatively low quality
[0008] 3) The direct reduced iron produced from the surface layer of lateritic nickel ore cannot remove Al by magnetic separation 2 o 3
When the direct reduction method is adopted, the follow-up process cannot bear the amount of slag brought by the spongy direct reduced iron into the furnace. At the same time, during the solid state reduction, the extremely fine Al in the ore 2 o 3 Particles cannot aggregate, cannot be removed by magnetic separation, and cannot be fed into the furnace, resulting in a high slag product, direct reduced iron, of little use
[0010] 4) The amount added to the blast furnace is too small
[0011] A small amount of low-nickel surface ore with low sulfur and phosphorus content and high iron content is added to the blast furnace to replace ordinary iron ore by a small number of steel mills (5%). However, because many current steel standards restrict the use of chromium and nickel, its usage is extremely limited, and cause waste of alloying elements

Method used

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  • Method for treating laterite-nickel ore surface ore through three-stage reduction method
  • Method for treating laterite-nickel ore surface ore through three-stage reduction method
  • Method for treating laterite-nickel ore surface ore through three-stage reduction method

Examples

Experimental program
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Effect test

Embodiment 1

[0055] Embodiment 1 The smelting of Philippine laterite nickel ore surface ore

[0056] According to attached figure 1 The schematic diagram of the process flow shown is for the smelting of the surface ore of laterite nickel ore in the Philippines, and its composition is shown in Table 1, in which the water of crystallization is not removed, and the elements cobalt, lead, tin, arsenic, antimony, and bismuth are not included; there is no flux for solid-state reduction Table 2 shows the composition of reduced coal and PCI coal used in this section.

[0057] Table 1 Composition of surface ore of Philippine lateritic nickel ore

[0058] element Fe Ni Cr 2 o 3

SiO 2

al 2 o 3

MnO P S moisture Content (wt%) 49.00 0.71 3.16 2.19 7.39 0.78 0.004 0.20 31.50

[0059] Table 2 Composition of reduced coal and PCI coal

[0060]

[0061] 1) Flux-free solid-state reduction section

[0062] Dry the surface ore of the laterite ni...

Embodiment 2

[0070] Example 2 Indonesia laterite nickel ore surface ore smelting basic alloy steel

[0071] The composition of the Indonesian laterite nickel ore surface layer treated in this embodiment is shown in Table 4.

[0072] Table 4 Composition of Indonesian laterite nickel surface ore

[0073] components Fe co Ni al 2 o 3

Cr 2 o 3

CaO MgO SiO 2

mn P S Content (wt%) 48.50 0.022 0.66 7.98 3.36 0.017 0.22 1.24 0.21 0.055 0.18

[0074] The process flow operation of the flux-free solid-state reduction section and the magmatic reduction section is the same as that of Example 1, the difference is that the slag discharge starts, the slag is discharged, the dephosphorization agent is added, and the dephosphorization is added to each ton of steel. Add 30kg of the agent to make the phosphorus in the steel reach below 0.03-0.05%.

[0075] The composition of the main product after the smelting of this embodiment is as shown in...

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Abstract

The invention belongs to the technical field of iron and steel smelting and discloses a method for treating laterite-nickel ore surface ore through a three-stage reduction method. The method for treating the laterite-nickel ore surface ore comprises three steps of a flux-free solid reduction stage, a magmatic reduction stage and a melt reduction refining stage, and can be used for finally producing nickel-chromium-containing basic alloy steel or low-nickel iron and aluminate cement clinker. According to the method for treating the laterite-nickel ore surface ore, non-coke smelting is adopted,high-value recovery of alloy elements in the laterite-nickel ore surface ore difficult to treat in an existing process and resource utilization of waste Al2O3 are achieved with low cost, and extremelyhigh economic value is achieved.

Description

technical field [0001] The invention belongs to the technical field of iron and steel smelting, and in particular relates to a method for treating surface ore of laterite nickel ore by using a three-stage reduction method. Background technique [0002] According to estimates by geologists, the prospective reserves of laterite nickel ore on the earth are more than 500 billion tons, and the surface layer of laterite nickel ore resources accounts for about one-third of the laterite nickel ore resources. The surface ore of laterite nickel ore has the following advantages: ① High iron content, if the crystal water in the surface ore of laterite nickel ore is removed, the iron content ratio can be as high as 50 or more; ② Contains nickel-chromium alloy elements necessary for the production of high-quality alloy steel, The total amount of iron, chromium and nickel in the raw ore that removes the crystal water by drying can be as high as 60% or more; ③The content of lead, tin, arsen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14C21B13/02C21B13/08C21B13/04C21B13/12C04B7/32
CPCC21B13/14C21B13/0006C21B13/006C21B13/0066C21B13/02C21B13/08C21B13/04C21B13/12C04B7/32
Inventor 王平赵永璞
Owner 王萍