Production method for reducing pellet pulverization

A production method and pelletizing technology, which are applied in the production field of reducing pellet pulverization, can solve the problems of high manufacturing cost and investment time cost, low applicability, etc., achieve low manufacturing cost, facilitate water vapor evaporation, improve The effect of burst temperature

Pending Publication Date: 2022-04-29
ANHUI UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this application, the air permeability of the pellets is increased by ore blending (that is, adding additives), so that the moisture in the pellets can escape more easily, and the moisture in the raw pellets is reduced by optimizing the pelletizing parameters. It has a good effect, but it is not universally applicable, because the pelletizing performance of each iron concentrate powder is very different, and each additive has a greater impact on the improvement of the bursting temperature of a specific pellet. If only If you want to increase the bursting temperature of pellets through ore blending and optimizing pelletizing parameters, you will have to spend a lot of time and effort to test and adjust the ratio. The manufacturing cost and investment time cost are high, so it is urgent to design It is particularly important to have a process route that has strong adaptability to pellet raw materials and can greatly increase the bursting temperature of pellets without the need for ore blending and optimization of pelletizing parameters.

Method used

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  • Production method for reducing pellet pulverization
  • Production method for reducing pellet pulverization
  • Production method for reducing pellet pulverization

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] 1.1. Ordinary drying at low temperature: First, fully mix 100% ultra-fine iron concentrate powder and 2.0% bentonite agent, add 6% water to mix, control the moisture content of the raw balls to 7% during the pelletizing process, and the pelletizing time is 18 minutes, including 2 minutes of consolidation, sieving to control the diameter of the green balls at 12.5-13.5mm; then, the green balls are subjected to low-temperature drying treatment, the wind speed of blast drying is controlled to be 1.5m / s, the drying temperature is 155°C, and the drying time is 2min.

[0052] 1.2 Drying at low temperature and high air volume: The batching and green ball making part are the same as in Example 1.1, and the improved belt roaster of the present invention is used to carry out blast drying treatment (that is, preheating section, roasting section, soaking section and cooling second section) The air volume is adjusted to the blast drying section), which effectively increases the air ...

Embodiment 2

[0057] 2.1. Ordinary drying at low temperature: 100% ultra-fine iron ore concentrate powder, mixed with slaked lime calculated at 1.2 alkalinity, and then mixed with 6% water to fully mix. 2 minutes, the diameter of green balls is 12.5 ~ 13.5mm, ordinary drying at low temperature, the wind speed of blast drying is 1.5m / s, the drying temperature is 158°C, and the drying time is 2 minutes.

[0058] 2.2. Drying at low temperature and large air volume: the ingredients and green pellets are the same as in Example 2.1, and the blast drying method of the present invention is used for drying treatment. The blast drying wind speed is controlled to be 3m / s, the drying temperature is 158°C, and the drying time is controlled. for 2min.

Embodiment 3

[0063] 3.1 Ordinary drying at low temperature: 100% coarse iron ore powder, add 2.0% bentonite, add 6% water to mix thoroughly, the water content of green balls is 8%, the time for pelletizing is 16 minutes, and then consolidated for 2 minutes, the diameter of green balls is 12.5 ~ 13.5mm, low temperature ordinary drying blast drying wind speed 1.5m / s, drying temperature 152 ℃, drying time 2min.

[0064] 3.2 Drying at low temperature and large air volume: the ingredients and green pellets are the same as in Example 3.1, and the blast drying method of the present invention is used for drying treatment. The blast drying wind speed is controlled to be 3m / s, the drying temperature is 152°C, and the drying time is 2min .

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Abstract

The invention discloses a production method for reducing pellet pulverization, and belongs to the technical field of pellet preparation. The method comprises the following steps: step 1, raw material pretreatment; the method comprises the following steps: drying mineral powder with low bursting temperature, fully and uniformly mixing the mineral powder with a binder and an additive in proportion, and then adding water for mixing; step 2, pelletizing treatment; 2, pelletizing the raw materials treated in the step 1 to prepare green pellets; thirdly, green pellets are treated, and finished pellets are obtained; and the green pellets screened in the second step are laid in a belt type roasting machine to be subjected to low-temperature drying, roasting and cooling treatment, and finished pellets are obtained. By adopting the technical scheme, the purposes of greatly increasing the pellet burst temperature and reducing pellet pulverization of the belt type roasting machine in the drying stage can be achieved, so that the manufacturing cost is effectively reduced, and the method is suitable for preparing pellets of different raw materials.

Description

technical field [0001] The invention belongs to the technical field of pellet preparation, and more specifically relates to a production method for reducing powdering of pellets. Background technique [0002] As a high-quality ironmaking charge, pellets are widely used in blast furnace production because of their unique advantages in improving the blast furnace utilization factor, improving the gas permeability of the material column, reducing exhaust gas emissions, and facilitating transportation. In recent years, with a series of environmental protection and overcapacity requirements issued by the state, the proportion of pellets in the blast furnace charge has been increasing, and the national production of pellets has also increased year by year. The main raw materials for the production of pellets are fine iron concentrate powder and binder. In order to meet the iron grade requirements of the blast furnace for iron-containing raw materials, the production of iron concen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/04C22B1/24C22B1/243C22B1/26
CPCC22B1/04C22B1/2406C22B1/26C22B1/243
Inventor 温宝良杨佳龙杨建吴宏亮张晓萍尤胜强常生朝张纯银孙晓东
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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