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Method for producing molten iron through multistage restoring complex difficultly-separated iron mine powder

A technology of iron ore powder and refractory separation, applied in the field of iron and steel metallurgy, can solve the problems of inefficient utilization of iron ore, high energy consumption, long ironmaking process, etc., achieve green development and utilization, simple production process, and high heat utilization efficiency high effect

Active Publication Date: 2018-05-11
NORTHEASTERN UNIV LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the current technical problems such as inability to efficiently utilize complex and refractory iron ore, long ironmaking process and high energy consumption, the present invention provides a multi-stage method for producing molten iron by reducing complex and refractory iron ore powder. Iron ore is used as a raw material, and molten iron with a metallization rate of more than 95% is obtained through a multi-stage cascade reduction process. The method specifically includes the following steps:

Method used

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Effect test

Embodiment 1

[0035] In this embodiment, a kind of fine-grained hematite ore in Benxi, Liaoning is used as a raw material, and common coal in Benxi is used as a reducing agent to produce molten iron by the method of the present invention, through the following steps:

[0036] 1. The composition of fine-grained hematite is mainly: TFe: 28.25%, FeO: 2.83%, SiO 2 :52.88%, Al 2 o 3 : 0.15%, CaO: 1.25%, MgO: 1.90%, P: 0.88%, S: 0.46%. The pulverized coal is the common pulverized coal in Benxi area, and the fixed carbon content in the pulverized coal is 82.3%.

[0037] 2. Raw materials are crushed, using crushers and ore mills to crush complex and refractory iron ore to -1mm, and coal to -1mm.

[0038] 3. The raw materials are mixed evenly, and the ingredients are mixed according to the mass ratio. It is determined according to the coal blending calculation and actual needs. The excess coal blending ratio in raw material mixing is 1.1.

[0039] 4. Send the raw materials mixed in proportion in...

Embodiment 2

[0043] In this embodiment, a kind of limonite in Anhui area is used as raw material, and coal in Anhui area is used as reducing agent to produce molten iron by the method of the present invention, through the following steps:

[0044] 1. The composition of limonite is mainly: TFe: 46.51%, FeO: 0.16%, Fe 2 o 3 :67.98%, SiO 2 :17.31%, Al 2 o 3 : 3.67%, CaO: 0.16%, MgO: 0.28%, P: 0.07%, S: 0.13%, limonite content accounts for 80%, coal powder is coal from Anhui area, and the fixed carbon content in coal powder is 81.6% .

[0045] 2. Raw material crushing, using crushers and ore mills to crush complex refractory iron ore to -0.5mm content accounting for 60%, and coal crushing to -0.5mm content accounting for 50%.

[0046] 3. Raw materials are mixed evenly. According to the calculation of coal blending and actual needs, the excess ratio of coal blending in raw material mixing is 1.15.

[0047] 4. Send the mixed raw materials in proportion to the fluidized bed reactor, heat an...

Embodiment 3

[0051] In this embodiment, a kind of siderite ore in Gansu area is used as raw material, and local coal is used as a reducing agent to produce molten iron by the method of the present invention, through the following steps:

[0052] 1. The composition of siderite ore is mainly: TFe: 26.75%, FeO: 20.23%, SiO 2 :30.23%, Al 2 o 3 : 8.65%, CaO: 0.68%, MgO: 1.89%, P: 0.03%, S: 0.15%, the siderite content in the ore is 70%. The pulverized coal is local coal, and the fixed carbon content in the pulverized coal is 82.9%.

[0053] 2. Raw material crushing, using crushers and ore mills to crush complex refractory iron ore to -0.1mm content accounting for 50%, and coal crushing to -0.1mm content accounting for 30%.

[0054] 3. Raw materials are mixed evenly. According to the calculation of coal blending and actual needs, the excess ratio of coal blending in raw material mixing is 1.1.

[0055] 4. Send the raw materials mixed in proportion into the fluidized bed reactor, heat and redu...

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Abstract

The invention relates to a method for producing molten iron through multistage restoring complex difficultly-separated iron mine powder, and belongs to the technical field of steel metallurgy. The method is characterized in that the iron mine powder and pulverized coal are mixed according to proportion through coal blending calculation, a mixture is fed into a fluidized bed reactor to be heated to700 DEG C-1100 DEG C, the motion lasts for 0.2 h-1.0 h, and first-stage restoring is carried out; a first-stage restored material is fed into a second-stage reaction tank at the temperature ranging from 800 DEG C-1300 DEG C, the motion lasts for 1.0 h-5.0 h, the second-stage restoring process is carried out, a second-stage restored material is fed into a deep reduction furnace at the temperatureranging from 1200 DEG C-1500 DEG C, motion lasts for 2.0 h-5.0 h, third-stage restoring is carried out, and separation of the molten iron and slag is achieved; and the iron metallization ratio of third-stage reduction molten iron discharged from the deep reduction furnace can reach 95% or above.

Description

technical field [0001] The invention belongs to the technical field of iron and steel metallurgy, and in particular relates to a method for producing molten iron by multi-stage reduction of complex refractory iron ore powder. Background technique [0002] my country's complex and refractory iron ore reserves exceed 20 billion tons, mainly including oolitic hematite, fine-grained hematite, refractory mirror iron ore, limonite, siderite and other types of iron ore Because the above types of iron ore are mostly embedded with extremely fine particle size, mineral composition and ore structure and structure are complex, it is difficult to select and enrich by conventional beneficiation methods. Many, can not realize the direct smelting production of molten iron. Therefore, under the current level of beneficiation and smelting technology, the above-mentioned complex and refractory iron ore cannot be effectively developed and utilized, resulting in my country having to rely heavily ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21B13/14
CPCC21B13/0006C21B13/14
Inventor 李艳军袁帅韩跃新高鹏孙永升张淑敏
Owner NORTHEASTERN UNIV LIAONING
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