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Process of preparing iron smelting pellet with hematite concentrate

A technology for oxidizing pellets and making pellets is applied in the field of producing iron ore pellets. The effect of production efficiency and low price

Inactive Publication Date: 2007-10-03
CENT SOUTH UNIV
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Problems solved by technology

The products produced by adding slaked lime, limestone, dolomite, etc. are flux pellets, which will change the charge structure of the blast furnace when used in blast furnace ironmaking, and its production process is also difficult to control
In addition, there are also researches on the preheating and roasting performance of red and limonite pellets by performing grinding treatment on the mixture. Although it has a certain effect, there are practical problems such as low grinding capacity, high energy consumption and steel consumption.
[0005] In order to effectively solve the problems of high preheating roasting temperature, long time and narrow suitable roasting temperature range in the preheating roasting process of hematite concentrate pellets, as well as the resulting problems in the actual production process of equipment materials and The present invention is specially proposed to solve the problems of high production operation requirements and to realize high-efficiency and low-consumption utilization of hematite to prepare iron-making oxidized pellets

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  • Process of preparing iron smelting pellet with hematite concentrate

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Embodiment Construction

[0013] Refer to the attached drawings, Example 1: Preparation of oxidized pellets from Carajás hematite concentrate in Brazil, the main chemical components of which are: TFe 66.54%, FeO 0.8%, SiO 2 1.21%, Al 2 O 3 1.51%, CaO 0.028%, MgO 0.045%. Add appropriate amount of bentonite, which is a pelletizing binder, to pelletize after mixing. The resulting green pellets are dried and then preheated and roasted at a preheating temperature of 1000℃~1050℃, preheating time of 18min~21min, and baking temperature of 1310℃. Under the condition of the firing time of 21min, the compressive strength of the preheated balls is about 440N / piece, and the compressive strength of the calcined balls is only about 1860N / piece. Under the premise of the same ratio of pelletizing bentonite, it will be composed of Fe according to mass percentage 3 O 4 60%, CaO 20%, B 2 O 3 20% of the additives are finely ground to a particle size of less than 0.074mm, and then mixed into the mixture at a mass percentage of ...

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Abstract

The process of preparing iron smelting pellet with hematite concentrate includes grinding additive to size below 0.074 mm, mixing the additive with hematite concentrate, pelletizing, drying, pre-heating and roasting to obtain acid pellet for smelting iron. The additive consists of B2O3, CaO and Fe3O4, and adding the additive can lower the pellet pre-heating temperature by about 100 deg.c, lower the pellet roasting temperature by about 50 deg.c and shorten the pre-heating and roasting time by over 1 / 3.

Description

Technical field [0001] The invention relates to a method for preparing iron ore pellets, in particular to a method for preparing oxidized roasted pellets for iron making from hematite concentrate. Background technique [0002] The reasonable charge structure model of blast furnace with high basicity sinter and acid pellets has been accepted by the Chinese iron industry. In recent years, the proportion of acid pellets entering the furnace has been increasing year by year. With the continuous expansion of the scale of my country’s iron and steel industry, the demand for acid pellets is also increasing year by year. The domestic supply of iron ore resources suitable for iron ore pellet production is becoming increasingly tight. The use of foreign iron ore resources has become my country’s iron ore pellets. An important issue that group production must face. However, most of the imported foreign iron concentrates are hematite, and the iron ore pellet plants in my country mainly use m...

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Application Information

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IPC IPC(8): C22B1/00C22B1/14C22B1/02
Inventor 郭宇峰姜涛邱冠周张艳明杨永斌李光辉黄柱成范晓慧张元波董海刚
Owner CENT SOUTH UNIV
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