Smelting system and smelting method for mother liquid of stainless steel

A technology of stainless steel and mother liquor, which is applied to the improvement of process efficiency, furnace type, furnace, etc., can solve the problems of high production cost, low production operation rate, high energy consumption of smelting, easy to achieve ratio, reduce energy consumption and raw material cost low effect

Inactive Publication Date: 2017-08-29
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Faced with the above technical problems, the present invention aims to provide a smelting system and method for stainless steel mother liquor to solve the problems of low production operation rate, high smelting energy consumption, and the high production cost of traditional stainless steel mother liquor requiring expensive high-carbon ferrochrome as raw material

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  • Smelting system and smelting method for mother liquid of stainless steel

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Experimental program
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Effect test

Embodiment 1

[0066] Chromite, iron concentrate, reducing agent, and binder are used as smelting raw materials, of which chromite (Cr 2 o 3 content is 43.69%, TFe content is 19.28%), iron concentrate (hematite, TFe is 51.45%), reducing agent, binder (bentonite) mass ratio is 100 parts: 100 parts: 70 parts: 13 parts; The particle size of chromite is 0.15mm-0.074mm, accounting for 38%, and below 0.074mm accounts for 30%. Semi-coke, whose particle size is below 0.074mm, accounts for 72%, and its fixed carbon is 75.44%. The above-mentioned raw materials are fed into the mixing device according to the proportion of the batching device, first dry mixed, then wet mixed with water, mixed and sent to the ball pressing device for molding, after being dried by 400 ° C dry gas, transported and distributed into the rotary hearth furnace , Reduction roasting at 1430 ° C to obtain metallized pellets. The hot metallized pellets are sent to the electric furnace and melted at 1720°C. After the slag and ir...

Embodiment 2

[0068] The smelting method of present embodiment stainless steel mother liquor is identical with embodiment 1 step, but process parameter is different, specifically as follows:

[0069] Chromite, iron concentrate, reducing agent, and binder are used as smelting raw materials, of which chromite (Cr 2 o 3 content is 43.69%, TFe content is 19.28%), iron concentrate (hematite, TFe is 51.45%), reducing agent, binder (bentonite) mass ratio is 100 parts: 200 parts: 96 parts: 19 parts; The particle size of chromite is 0.15mm-0.074mm, accounting for 30%, and below 0.074mm accounts for 15%. Semi-coke, whose particle size is below 0.074mm, accounts for 72%, and its fixed carbon is 75.44%. The above-mentioned raw materials are fed into the mixing device according to the proportion of the batching device, first dry mixed, then wet mixed with water, mixed and sent to the ball pressing device for molding, after being dried by 300 ° C dry gas, transported and distributed into the rotary hea...

Embodiment 3

[0071] The smelting method of present embodiment stainless steel mother liquor is identical with embodiment 1 step, but process parameter is different, specifically as follows:

[0072] Chromite, iron concentrate, reducing agent, and binder are used as smelting raw materials, of which chromite (Cr 2 o 3 content is 40.69%, TFe content is 21.24%), iron concentrate (hematite, TFe is 51.45%), reducing agent, binder (bentonite) mass ratio is 100 parts: 140 parts: 74 parts: 16 parts; The particle size of chromite is 0.15mm-0.074mm, accounting for 45%, and below 0.074mm accounts for 25%; the particle size of iron concentrate is 0.15mm-0.074mm, accounting for 30%, below 0.074mm, accounting for 40%. Anthracite, whose particle size is less than 0.074mm, accounts for 65%, and its fixed carbon is 80.56%. The above-mentioned raw materials are fed into the mixing device according to the ratio of the batching device, first dry mixed, then wet mixed with water, and then sent to the ball pre...

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Abstract

The invention relates to a smelting system and a smelting method for a mother liquid of stainless steel. The smelting system includes a mixing and pelletizing unit, a drying apparatus, a rotary hearth furnace, and an electric furnace. The mixing and pelletizing unit includes a raw material inlet and a pellet outlet; the drying apparatus includes a pellet inlet, a drying gas inlet, a flue gas outlet, and a dried pellet outlet; the pellet inlet is connected to the pellet outlet; the rotary hearth furnace includes a flue, a material distributing mouth, a burning nozzle, and a pre-reduced pellet outlet; the material distributing mouth is connected to the dried pellet outlet; the electric furnace includes a pre-reduced pellet inlet, an iron outlet and a slag outlet; the pre-reduced pellet inlet is connected to the pre-reduced pellet outlet. By means of the system and the method, ratio of chromite ore powder and iron ore is easy to control, and metallization ratio of thermal-state metallized pellet is high. So that a mother liquid of stainless steel, which includes required components, can be smelted in one step; the pellets are hot-delivered to the electric furnace with non-coke coal resource and hot delivery method which are low in cost, thus reducing cost and energy consumption.

Description

technical field [0001] The invention relates to the field of metal smelting, in particular to a smelting system and method for stainless steel mother liquor. Background technique [0002] Stainless steel has excellent properties such as heat resistance, high temperature resistance and corrosion resistance, and is widely used in modern industry. The raw materials for stainless steel smelting are mainly metal materials and alloys. Metal materials include return scrap, ordinary scrap and blast furnace hot metal. Alloys mainly include high, medium and low carbon ferrochromium, electrolytic ferronickel, metallic nickel or NiO, etc. Chromium-containing hot metal and chromium ore have dual properties of metal material and alloy. Different metal materials will adopt different smelting production processes. When the metal material is recycled steel scrap or ordinary steel scrap, the electric arc furnace is generally used as the primary furnace to melt scrap steel and alloy materi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/242C21B13/10C21C5/52C22C33/04
CPCC21B13/105C21C5/005C22B1/242C22C33/04Y02P10/20
Inventor 任中山闫方兴徐刚曹志成汪勤亚吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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