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Complex manganese ore powder pelletization process

A technology of manganese ore powder and pellets, which is applied in the field of iron and steel metallurgy, can solve the problems of low strength of pellets, coarse particle size of manganese powder ore, and poor thermal stability, and achieve the effects of reducing energy consumption, high manganese grade, and improving performance

Inactive Publication Date: 2010-02-10
CENT SOUTH UNIV
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  • Abstract
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Problems solved by technology

[0007] In order to solve the technical problems of coarse particle size, low specific surface area, poor spheroidization and poor thermal stability of manganese powder ore containing high crystal water, resulting in pellet bursting, low pellet strength and low output, high roasting temperature and high energy consumption, this project The invention provides a process for preparing pellets from complex manganese ore powder

Method used

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  • Complex manganese ore powder pelletization process

Examples

Experimental program
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Effect test

Embodiment 1

[0017] Example 1: The pretreatment method is to sieve and crush high-crystal manganese powder ore with a four-roller crusher to a particle size of -3mm, accounting for 90%, and then roll twice through a high-pressure roller mill at a material moisture content of 8.2%. Pressure 0.83MPa. When making pellets, the amount of bentonite used is 2.0% of the mass of manganese powder ore, the pelletizing time is 6 minutes, the water content of raw pellets is 16±0.5%, and the natural alkalinity is 0.17. Grate machine-rotary kiln conditions are: grate cloth height 220mm, blast drying wind speed 1.6m / s, blast drying time 2min, blast drying temperature 200℃, draft drying wind speed 1.6m / s, draft drying time 5min , Air extraction drying temperature 350°C, preheating stage 1 wind speed 2.4m / s, time 4min, temperature 700°C, preheating stage 2 wind speed 2.4m / s, time 15min, temperature 1050°C, roasting temperature 1330°C, time 15min. The results of the manganese ore pellets obtained are as fol...

Embodiment 2

[0018] Example 2: The pretreatment method is to sieve and crush the high-crystal manganese powder ore with a roller crusher until the particle size is -3mm, which accounts for 100%, and then roll once through the high-pressure roller mill under the material moisture of 8%, and the rolling pressure 1MPa. When making pellets, the amount of bentonite is 2.0%, the pelleting time is 8 minutes, the water content of raw pellets is 16±0.5%, and the natural alkalinity is 0.17. Grate machine-rotary kiln conditions are: grate cloth height 220mm, blast drying wind speed 1.6m / s, blast drying time 2min, blast drying temperature 200℃, draft drying wind speed 1.6m / s, draft drying time 5min , Air extraction drying temperature 350°C, preheating stage 1 wind speed 2.4m / s, time 4min, temperature 500°C, preheating stage 2 wind speed 2.4m / s, time 15min, temperature 1050°C, roasting temperature 1340°C, time 20min. The results of the manganese ore pellets obtained are as follows: the compressive str...

Embodiment 3

[0019]Example 3: The pretreatment method is to sieve and crush the high-crystal manganese powder ore with a roller crusher to a particle size of -3mm, which accounts for 100%, and then roll twice through a high-pressure roller mill under a material moisture of 8%. Pressure 0.83MPa. When making pellets, the amount of bentonite is 2.0%, the pelleting time is 6 minutes, the water content of raw pellets is 16±0.5%, and the alkalinity R=0.7. Grate machine-rotary kiln conditions are: grate cloth height 220mm, blast drying wind speed 1.6m / s, blast drying time 2min, blast drying temperature 150℃, draft drying wind speed 1.6m / s, draft drying time 5min , Air extraction and drying temperature 200°C, preheating stage 1 wind speed 2.4m / s, time 4min, temperature 600°C, preheating stage 2 wind speed 2.4m / s, time 15min, temperature 1080°C, roasting temperature 1330°C, time 15min. The results of manganese ore pellets obtained are as follows: the compressive strength of the preheated ball is 5...

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Abstract

The invention relates to a complex manganese ore powder pelletization process. High-crystal-water manganese powder ore is treated by a cylindrical drier for drying, a four-roll crusher for coarse crushing and a high-pressure roller mill for fine milling pretreatment, bentonite and flux are added in finely milled manganese ore concentrate obtained after pretreatment for pelletization, green pelletsare dried and preheated on a chain-grate machine, preheated pellets enter a rotary kiln for high-temperature roasting and then is cooled to obtain a pellet product. Compared with ball milling process, the invention can reduce the energy consumption in pretreatment flow, improve the ballability index of finely milled material, eliminate thermal explosion of pellets and solve the technical problemsthat narrow manganese ore softening temperature area affects pellet roasting. The adoption of two-segment preheating effectively prevents cracks on the preheated pellets and improves the performancesof the preheated pellets; the addition of limestone or dolomite as flux changes the alkalinity and the slagging property of raw material and enhances the pellet roasting and next melting; and the produced manganese ore pellet has high strength, large output and high manganese grade.

Description

technical field [0001] The invention relates to a process for preparing pellets by using manganese powder ore containing high crystal water, which belongs to the field of iron and steel metallurgy. Background technique [0002] For steelmaking enterprises, manganese is an indispensable element, so there is a saying in steelmaking that "no manganese can't make steel". Manganese is a deoxidizer and desulfurizer in the steelmaking process; manganese can strengthen ferrite and refine pearlite, so it can improve the strength and hardenability of steel, so it is also one of the good alloying elements. When the manganese content is greater than 10%, the corrosion resistance of steel in the atmosphere is greatly enhanced, and manganese can also reduce the damage of oxygen and sulfur to steel, thereby improving the forgeability and rollability of steel. When steelmaking pig iron and foundry pig iron are smelted, a small amount of manganese ore is added to increase the manganese cont...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/216C22B1/243
Inventor 朱德庆潘建徐栋梁春铁军罗艳红沈文俊
Owner CENT SOUTH UNIV
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