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Method for obtaining limonite pellets under laboratory conditions

An iron ore ball and laboratory technology, applied in the field of metallurgical research, can solve problems such as limiting the full application ratio of limonite powder and production restrictions, achieve good practicability and economy, improve compressive strength, and strengthen internal consolidation The effect of the reaction

Active Publication Date: 2021-12-03
ZHONGYE-CHANGTIAN INT ENG CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method still has the problem that in the ore blending process, the addition of other iron concentrate powders needs to be about 15%, and the content of limonite powder is about 85%. The proportion of other raw materials added except limonite powder is still high. The full application ratio of limonite powder is limited, and the production under certain specific conditions is limited
For example, in a mine rich in limonite, there is only limonite in the local area. If you want to adopt a direct pelletizing production plan in the mine, you need to transport other iron concentrate powder from other places to bring unnecessary transportation costs.

Method used

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  • Method for obtaining limonite pellets under laboratory conditions

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Such as figure 1 Shown, the method for obtaining limonite pellets under laboratory conditions, it may further comprise the steps:

[0022] Step 1. Add limonite powder with a particle size of 200 mesh to 100 mesh and more than 85% to account for 99% of the total limonite powder content (990g limonite powder), add 1% bentonite (10g bentonite) and mix evenly ore and add water to moisten to obtain 1kg total limonite ore powder;

[0023] Step 2, making the total limonite ore powder obtained in step 1 into green pellets in a pelletizer to obtain green pellets with a diameter of 15 to 35 mm and a content ≥ 95%;

[0024] Step 3. Put the green balls with a diameter of 15-35mm obtained in step 2 into a corundum crucible, dry at 200°C for 20 minutes, heat up to 700°C for preheating for 20 minutes, continue to heat up to 1200°C for 25 minutes, and turn off the electric furnace after roasting. Cool the furnace to 1000°C, then half-open the furnace door and continue to cool down. W...

Embodiment 2

[0028] Such as figure 1 Shown, the method for obtaining limonite pellets under laboratory conditions, it may further comprise the steps:

[0029] Step 1. Add 0.5% bentonite (5g bentonite) to the limonite powder with a particle size of 200 mesh to 100 mesh and more than 85% to account for 99.5% of the total limonite powder content (995g bentonite) and mix evenly ore and add water to moisten to obtain 1kg total limonite ore powder;

[0030] Step 2, making the total limonite ore powder obtained in step 1 into green pellets in a pelletizer to obtain green pellets with a diameter of 15 to 35 mm and a content ≥ 95%;

[0031] Step 3. Put the green balls with a diameter of 15-35mm obtained in step 2 into a corundum crucible, dry at 200°C for 20 minutes, heat up to 700°C for preheating for 20 minutes, continue to heat up to 1200°C for 25 minutes, and turn off the electric furnace after roasting. Cool the furnace to 1000°C, then half-open the furnace door and continue to cool down. Wh...

Embodiment 3

[0035] Such as figure 1 Shown, the method for obtaining limonite pellets under laboratory conditions, it may further comprise the steps:

[0036] Step 1. Add 0.2% bentonite (2g bentonite) to the limonite powder with a particle size of 200 mesh to 100 mesh and more than 85% to account for 99.8% of the total limonite powder content (998g bentonite) and mix evenly ore and add water to moisten to obtain 1kg total limonite ore powder;

[0037] Step 2, making the total limonite ore powder obtained in step 1 into green pellets in a pelletizer to obtain green pellets with a diameter of 15 to 35 mm and a content ≥ 95%;

[0038] Step 3. Put the green balls with a diameter of 15-35mm obtained in step 2 into a corundum crucible, dry at 200°C for 20 minutes, heat up to 700°C for preheating for 20 minutes, continue to heat up to 1200°C for 25 minutes, and turn off the electric furnace after roasting. Cool the furnace to 1000°C, then half-open the furnace door and continue to cool down. Wh...

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Abstract

The invention relates to a method for obtaining limonite pellets under laboratory conditions, and belongs to the technical field of metallurgical scientific research. Bentonite accounting for 1% or less of total limonite powder is added to limonite powder accounting for 99% or more of the total limonite powder, the mixture is uniformly mixed for ore blending, and water is added for wetting to obtain the total limonite powder; green pellets are prepared, and green pellets with the diameter of 15-35 mm account for 95% or more; and the green pellets are dried, preheated and roasted, an electric furnace is shut down after roasting, furnace cooling is performed to 1000 DEG C, then a furnace door is half open to continue cooling, a crucible containing the pellets is taken out when the temperature in the furnace is reduced to 800 DEG C, and the crucible is placed on a marble floor to be cooled to room temperature without taking out the pellets, so as to obtain the limonite pellets for a laboratory. According to the method, the high-proportion limonite powder is directly adopted as the raw material to prepare the finished pellets meeting the strength required by blast furnace ironmaking.

Description

technical field [0001] The invention relates to a method for obtaining limonite pellets under laboratory conditions, and belongs to the technical field of metallurgical scientific research. Background technique [0002] In recent years, the iron and steel industry has developed steadily, and the outstanding characteristics of my country's iron ore resources such as poverty, miscellaneous, and difficult selection make it necessary for my country to import a large number of high-grade iron ore resources from abroad. However, with the continuous development of society and the depletion of high-grade iron ore resources, the research and utilization of low-grade iron ore needs to be further deepened. As a representative ore of low-grade ores, limonite has not been widely put into production due to its low grade and poor performance, and its performance after roasting or sintering cannot meet the smelting requirements. If low-grade limonite can be converted into high-grade high-q...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/22C22B1/243C22B1/26
CPCC22B1/243C22B1/22C22B1/26Y02P10/20
Inventor 周晓雷王云鹏张闯范心瑜徐方鸿林钰智
Owner ZHONGYE-CHANGTIAN INT ENG CO LTD
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