Method for smelting nickel-containing ferrochrome alloy

A ferroalloy, nickel-chromium technology, applied in the field of nickel-chromium ferroalloy smelting, can solve the problems of inability to ensure the uniformity of material distribution, high energy consumption and production costs, and low metal content, so as to shorten smelting time, reduce smelting power consumption, and batching uniform effect

Pending Publication Date: 2017-09-22
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Abstract
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Problems solved by technology

The flux is directly added into the furnace from the material pipe, and it is distributed in multiple layers with the ore raw materials, which cannot guarantee the uniformity of the material distribution and will cause material segregation.
In addition, nickel, an important alloying element of stainless steel, is not contained in ferrochrome alloys currently on the market. However, nickel-iron alloys are smelted through laterite nickel ore alone, and because the metal content in laterite nickel ore is low, energy consumption and production costs are both low. relatively high

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  • Method for smelting nickel-containing ferrochrome alloy

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Comparison scheme
Effect test

Embodiment 1

[0036] The Cr of the chromite powder that present embodiment uses 2 o 3 The content of TFe (total iron) is 41.24%, and the content of TFe (total iron) is 21.0%. The content of Ni in lateritic nickel ore is 1.70%, and the content of MgO is 19.17%.

[0037] Take 100 parts of chromite powder, 40 parts of laterite nickel ore, 25 parts of semi-coke, 3 parts of bentonite, and 8 parts of silica, and control the ratio of magnesium to aluminum to 0.91. The particle size of laterite nickel ore ground to below 100 mesh accounts for 83%; the particle size of semi-coke with carbon content above 75% to below 200 mesh accounts for 90%; the particle size of silica ground to below 200 mesh accounts for 83%. than 92%.

[0038] Such as figure 1 As shown, in step S100, the above-mentioned raw materials are mixed according to the above-mentioned proportions, and after mixing evenly, water is added to make the water content of the mixed raw materials 7%, and then the pellets are obtained by briq...

Embodiment 2

[0040] The Cr of the chromite powder that present embodiment uses 2 o 3 The content is 41.24%, the TFe (total iron) content is 21.0%, the Ni content of lateritic nickel ore is 1.70%, and the MgO content is 19.17%.

[0041] Take 100 parts of chromite powder, 100 parts of laterite nickel ore, 18 parts of semi-coke, 1 part of bentonite, and 10 parts of silica, and control the ratio of magnesium to aluminum to 1.20; grind the laterite nickel ore to a particle size below 100 mesh, accounting for 83% ; The semi-coke with a carbon content of more than 75% is ground to a particle size below 200 mesh, accounting for 90%; the particle size of silica ground to a particle size below 200 mesh accounts for 92%.

[0042] Such as figure 1 As shown, in step S100, the above-mentioned raw materials are mixed according to the above-mentioned proportions, and after mixing evenly, water is added to make the water content of the mixture 10%, and then briquetting is performed to obtain pellets. In...

Embodiment 3

[0044] The Cr of the chromite powder that present embodiment uses 2 o 3 The content of TFe (total iron) is 41.24%, and the content of TFe (total iron) is 21.0%. The content of Ni in lateritic nickel ore is 1.70%, and the content of MgO is 19.17%.

[0045] Take 100 parts of chromite powder, 60 parts of laterite nickel ore, 10 parts of semi-coke, 2 parts of bentonite, and 6 parts of silica, and control the ratio of magnesium to aluminum to 1.06. The particle size of the laterite nickel ore that is ground to below 100 mesh accounts for 80%; the particle size of semi-coke with a carbon content of more than 75% that is ground to below 200 mesh accounts for 80%; the particle size of silica that is ground to below 200 mesh accounts for 80%. than 80%.

[0046] Such as figure 1 As shown, in step S100, the above-mentioned raw materials are mixed according to the above-mentioned proportions, and after mixing evenly, water is added to make the water content of the mixed raw materials 8...

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Abstract

The invention relates to a method for smelting nickel-chromium ferroalloy, which comprises the following steps: uniformly mixing the ground laterite nickel ore with chromite powder, reducing agent, binder and fluxing agent to prepare balls The pellets are placed in a rotary hearth furnace for high-temperature reduction to obtain metallized pellets; the metallized pellets are sent to an electric furnace for high-temperature melting and separation to obtain nickel-chromium-iron alloys. The present invention uses the easy-to-form characteristics of laterite-nickel ore by mixing ingredients with chromite ore and high-magnesium laterite-nickel ore, reduces the addition of binders, and molds cheap and difficult-to-form chromite powder ore, reducing the Production cost; all raw materials are pre-mixed, the ingredients are relatively uniform, and the smelting time is shortened; the pellets are pre-reduced at high temperature in the rotary hearth furnace, which effectively reduces the power consumption of the electric furnace smelting; at the same time, due to the introduction of Ni in the laterite nickel ore, nickel-containing The ferrochrome alloy further obtained low-cost raw materials for smelting stainless steel.

Description

technical field [0001] The invention relates to the field of ferroalloy smelting, in particular to a method for smelting nickel-chromium ferroalloy. Background technique [0002] Ferrochrome alloys can be divided into four types according to the carbon content: high carbon, medium carbon, low carbon and micro carbon. They are mainly used in the production of special alloys and smelting special steels, such as stainless steel, spring steel, tool steel, etc., so they can be widely used in Aeronautics, aerospace, automobiles, shipbuilding and defense industries. At present, it is commonly used to smelt 300 series stainless steel together with nickel-iron alloy. The mainstream production process of ferrochrome is the submerged arc furnace process, which uses high-quality lump ore, coke or sintered ore to smelt ferrochrome in the submerged arc furnace. One of the key points in the production operation of the submerged arc furnace of this process is to ensure good air permeabili...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/243C22B23/02C22B34/32C21B13/14C22C35/00
CPCC22B1/243C21B13/0006C21B13/14C22B23/021C22B23/023C22B34/32C22C35/00
Inventor 任中山闫方兴徐刚陈佩仙曹志成吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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