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Method for enhancing intensity of ground hematite pellet preheated pellets

A technology for hematite powder and hematite, which is applied in the field of iron-making raw material pellet production, can solve the problems of high preheating roasting temperature, high requirements on equipment material and production operation, and achieves lower preheating temperature and low processing cost. , the effect of increasing the specific surface area

Active Publication Date: 2012-10-03
SHANXI TAIGANG STAINLESS STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can effectively solve the problems of high preheating roasting temperature in the preheating roasting process of hematite concentrate pellets and the resulting high requirements for equipment materials and production operations in the actual production process, thereby efficiently utilizing Preparation of Oxidized Pellets from Hematite Powder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1: Prepare hematite powder pellets through high-pressure roller mill pretreatment:

[0023] The specific steps of preparing hematite powder pellets by this method are as follows:

[0024] (1) Raw material processing:

[0025] Selected raw materials: a Brazilian iron ore concentrate powder with a FeO content of 3.7%, a content of 67% with a particle size of less than 0.044mm, a moisture content of hematite powder of 7.5%, and a specific surface area of ​​1324cm 2 .g -1 ;

[0026] After the hematite is filtered or dried in a drum dryer to reach a suitable moisture content of 6.7%, it is sent to a high-pressure roller mill for pretreatment by high-pressure roller mill;

[0027] The pressure of the high-pressure roller mill is 5.3MPa, and the specific surface area of ​​the hematite powder is 1739cm when it exits the high-pressure roller mill. 2 .g -1 ;

[0028] (2) Ingredients:

[0029] The hematite powder and bentonite after the high-pressure roller mill ...

Embodiment 2

[0040] Embodiment 2: Preparation of hematite powder pellets through high-pressure roller mill pretreatment:

[0041] The specific steps of preparing hematite powder pellets by this method are as follows:

[0042] (1) Raw material processing:

[0043] Selected raw materials: a Brazilian iron ore concentrate powder with a FeO content of 1.2%, a content of 72% with a particle size of less than 0.044mm, a moisture content of hematite powder of 7.1%, and a specific surface area of ​​1203cm 2 .g -1 ;

[0044] After the hematite is filtered or dried in a drum dryer to reach a suitable moisture content of 6.5%, it is sent to a high-pressure roller mill for high-pressure roller mill pretreatment;

[0045] The pressure of the high-pressure roller mill is 5.5MPa, and the specific surface area of ​​the hematite powder is 1824cm when it exits the high-pressure roller mill. 2 .g -1 ;

[0046] (2) Ingredients:

[0047] The hematite powder and bentonite after the high-pressure roller m...

Embodiment 3

[0058] Embodiment 3: Preparation of hematite powder pellets through high-pressure roller mill pretreatment:

[0059] The specific steps of preparing hematite powder pellets by this method are as follows:

[0060] (1) Raw material processing:

[0061] Selected raw materials: Lanxian iron ore concentrate powder, FeO content is 6.5%, the content of particle size less than 0.044mm is 87%, the moisture content of hematite powder is 8.7%, and the specific surface area is 1432cm 2 .g -1 ;

[0062] After the hematite is filtered or dried in a drum dryer to reach a suitable moisture content of 6.5%, it is sent to a high-pressure roller mill for high-pressure roller mill pretreatment;

[0063] The pressure of the high-pressure roller mill is 5.0MPa, and the specific surface area of ​​the hematite powder reaches 1785cm when it exits the high-pressure roller mill 2 .g -1 ;

[0064] (2) Ingredients:

[0065] The hematite powder and bentonite after the high-pressure roller mill proce...

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Abstract

The invention relates to a method for enhancing the intensity of ground hematite pellet preheated pellets. The method comprises a burdening process, a mixing process, a pelletizing process, a distributing process and a baking process and is characterized in that: a process for pretreating ground hematite by using a high-pressure roller mill is performed; the pressure of the high-pressure roller mill is between 3 and 6 MPa; and the ground hematite is pretreated under an appropriate process parameter condition through the high-pressure roller mill pretreating process, so that the preheating temperature of a pellet is lowered to be below 1,000 DEG C and the intensity of a preheated pellet entering a rotary kiln reaches over 400 N / pellet. The method is particularly suitable for an enterprise which produces the pellet by taking the ground hematite as a raw material by a chain grate-rotary kiln process, can effectively solve the problem of high preheating and baking temperatures existing inthe preheating and baking processes of hematite concentrate pellets and the problems of high requirements on equipment materials, production operation and the like in the practical production process, which are caused by the high preheating and baking temperatures, and realizes production of oxide pellets for iron making by efficiently utilizing the ground hematite.

Description

technical field [0001] The invention relates to a method for increasing the strength of preheating pellets of hematite powder pellets, which belongs to the field of ironmaking raw material pellet production. Background technique [0002] In recent years, with the development of my country's iron and steel industry, many large-scale blast furnaces have been newly built. At the same time, in order to ensure the quality requirements of the raw materials for the furnace, a new grate-rotary kiln production line has been newly built. Compared with the traditional shaft furnace pellet production process, the quality of pellets produced by the grate machine-rotary kiln process is better, which ensures the stable operation of the blast furnace to a certain extent. At present, there are two main types of iron ore powder used in the production of pellets, one is magnetite powder and the other is hematite powder. After the magnetite powder is pelletized, when the grate-rotary kiln proc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/14
Inventor 范建军冯焕林蔡湄夏贺淑珍张华
Owner SHANXI TAIGANG STAINLESS STEEL CO LTD