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Pellet preparation method

A pelletizing and pelletizing technology is applied in the field of green pellets and pellets preparation to achieve the effect of lowering the liquid phase formation temperature and good strength

Active Publication Date: 2011-10-05
ZHONGYE-CHANGTIAN INT ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The technical problem to be solved by the present invention is to provide a green pellet, which can prevent ring formation caused by excessive sintering temperature when the green pellet is roasted in a rotary kiln

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0054] Design grate machine-rotary kiln according to a kind of implementation mode of pelletizing device of the present invention, main design parameter is as follows:

[0055] Grate machine specifications: 4m (width) × 37.5m (length), the length of the first drying section is 7.5m, the set temperature is 230°C, the wind speed of the material surface is 1.5m / s; the length of the second drying section is 7.5m, and the set temperature is 360 ℃, the wind speed at the material surface is 1.2m / s; the length of the first preheating section is 7.5m, the set temperature is 700°C, and the wind speed at the material surface is 1.0m / s; the length of the second preheating section is 15m, and the set temperature is 1100°C. The wind speed on the surface of the material is 0.7m / s; the first-stage drying and the second-stage drying are both exhausted drying methods.

[0056] Rotary kiln set temperature: 1320°C.

[0057] Ring cooler specifications: diameter 12.5m, width 2.2m, effective coolin...

Embodiment 2

[0063] The difference from Example 1 is that the following process design parameters have been changed: the set temperature of the first drying section is 220°C, and the wind speed of the material surface is 1.4m / s; the set temperature of the second drying section is 340°C, and the wind velocity of the material surface is 1.3m / s s,; the set temperature of the first preheating section is 680°C, and the wind speed of the material surface is 1.1m / s; the set temperature of the second preheating section is 1080°C, and the wind speed of the material surface is 0.7m / s; The first-stage drying is the exhaust drying method; the set temperature of the rotary kiln is 1300° C.; other parameters are the same as in Example 1.

[0064] Raw material ratio: 41.4wt% of Brazilian hematite and sulfuric acid slag, 14.8wt% of magnetite, 1.5wt% of bentonite, 0.9wt% of dolomite. The water content is 11.6wt%, the burst temperature is 430°C, and the binary alkalinity is 0.35.

[0065] Send the raw pell...

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Abstract

The present invention provides a green pellet prepared from ferrous raw materials, an adhesive and an additive, wherein the diacidic alkalinity of the green pellet is 0.2-0.4, the ferrous raw materials comprise at least 80 weight percent of hematite and / or sulphuric acid residue. Compared with the prior art, when the pellet is roasted, because the pellet comprises partial CaO, the CaO reacts with Fe2O3 to generate a calcium ferrite system compound, the roasting temperature of the hematite pellet in a rotary kiln can be reduced to 1280-1330 DEG C, and a ring forming problem cause by overhigh roasting temperature is avoided, therefore, the high-intensity pellet ore can be prepared, and the continuous production can be ensured.

Description

technical field [0001] The invention relates to metallurgical raw materials, in particular to a method for preparing green pellets and pellets. Background technique [0002] Pellet is one of the main raw materials for blast furnace ironmaking and direct reduced iron. Pellets have several advantages over sinter. For example, the mechanical strength of pellets in the cold state is higher than that of sintered ore, so it is not easy to be broken and cracked during transportation, loading and unloading and storage, with less consumption and less powder produced, which is conducive to improving the air permeability of the blast furnace material column and making the furnace The airflow inside is evenly distributed. In the prior art, there are mainly three methods for preparing pellets, namely: the method of producing pellets in a shaft furnace, the method of preparing pellets by a belt roaster, and the method of preparing pellets by a chain grate-rotary kiln method. Compared w...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242C22B1/216
CPCY02P10/20
Inventor 夏耀臻肖业俭陈有垒黎前程
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD