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Method for improving strength of iron ore concentrate green pellets

A technology for iron concentrate and green pellets, which is applied in the field of improving the strength of hard-to-make ductile iron concentrate green pellets and the strength of iron concentrate green pellets, can solve the problem of low green pellet strength and large amount of binder used. and other problems, to achieve the effect of improving drop and compressive strength, less equipment investment, and improved drop strength and compressive strength

Active Publication Date: 2014-12-03
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Aiming at the disadvantages of large amount of binder used and low green pellet strength in the iron concentrate pelletizing process of the prior art, the purpose of the present invention is to provide a method that can effectively improve the green pellet strength of iron concentrate and reduce the bonding strength. This method is simple to operate and low in cost, and is especially suitable for the pelletizing of refractory nodular iron concentrate, which can significantly improve the pelletizing performance of refractory nodular iron concentrate and obtain high-strength green pellets.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Using low-rank lignite as raw material, add 0.1mol / L NaOH solution according to the mass ratio of sodium hydroxide solution and low-rank lignite at 3:1, and extract at 80°C for 30min to obtain a sodium humate solution with a concentration of 116g / L . Then adjust the pH value of the sodium humate binder solution to 6.0 with a HCl solution with a concentration of 1 mol / L. The obtained sodium humate solution is added to 98.6% fluorine-containing magnetite at -200 mesh according to the ratio of 0.2wt% of the dry weight of sodium humate to the dry weight of iron concentrate, and mixed evenly, and then pre-treated by moistening and grinding to produce For balls, the drop strength of raw balls is 3.9 times / 0.5m, and the compressive strength is 18.2N / piece, meeting the production requirements of pelletizing.

Embodiment 2

[0025] Using weathered coal as raw material, add 0.3mol / L NaOH solution according to the mass ratio of sodium hydroxide solution to weathered coal at 5:1, and extract at 75°C for 60 minutes to obtain a sodium humate solution with a concentration of 137g / L. Then adjust the pH value of the sodium humate binder solution to 7.0 with a HCl solution with a concentration of 3 mol / L. The obtained sodium humate solution is added to the flotation hematite concentrate of 89.3% at -200 mesh according to the ratio of 0.6wt% of the dry weight of sodium humate to the dry weight of the iron concentrate, and then mixed evenly, and then pre-treated by moistening and grinding For pelletizing, the drop strength of raw pellets is 5.2 times / 0.5m, and the compressive strength is 15.8N / piece, meeting the pelletizing production requirements.

Embodiment 3

[0027] Using a mixed coal sample of low-rank lignite and weathered coal as raw material, add 0.5mol / L NaOH solution according to the mass ratio of sodium hydroxide solution to weathered coal at 6:1, extract at 75°C for 90min, and obtain a concentration of 142g / L L of sodium humate solution. Then adjust the pH value of the sodium humate binder solution to 8.0 with a HCl solution with a concentration of 5 mol / L. The obtained sodium humate binder solution is added to the specularite in the ratio of 0.8wt% of the weight of the iron concentrate according to the dry weight, and then mixed evenly, and then moistened and pretreated to make pellets. The ball drop strength is 4.8 times / 0.5m, and the compressive strength is 16.6N / piece, meeting the production requirements of pelletizing.

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Abstract

The invention discloses a method for improving the strength of iron ore concentrate green pellets. The method comprises the following steps: adjusting the pH value of a sodium humate solution with a certain concentration to be 6.0-8.0 by using acid, then uniformly adding the sodium humate solution to the surface of iron ore concentrates, performing wet-grinding pre-treatment after uniform mixing, and pelletizing. The method is simple in operation and low in cost, is suitable for pelletizing various iron ore concentrates, and is particularly suitable for pelletizing iron ore concentrates which are difficult to pelletize; moreover, the use amount of the sodium humate is small, and the falling strength and compression strength of the prepared green pellets are obviously improved to meet requirements for pellet production.

Description

technical field [0001] The invention relates to a method for increasing the strength of iron concentrate green pellets, in particular to a method for improving the strength of refractory nodular iron concentrate green pellets, and belongs to the field of metallurgical engineering materials. Background technique [0002] In recent years, my country's pellet industry has been vigorously developed, and the proportion of pellets in blast furnace charge has increased year by year, providing high-quality charge for increasing production, saving energy, reducing costs and increasing efficiency in blast furnace production. However, since bentonite is generally used as a binder in the production of pellets at present, its dosage is generally 2% to 3% (a few up to about 5%). Production practice has proved that about 90% of bentonite will remain in the finished pellets, resulting in a decrease in the TFe grade of the pellets, and the organic binder is a substance mainly composed of hig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244
Inventor 张元波李光辉姜涛周友连范晓慧郭宇峰杨永斌黄柱成李骞陈许玲彭志伟甘敏徐斌孙阳陈军游志雄苏子键刘兵兵刘臣
Owner CENT SOUTH UNIV
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