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Preparation method and application of high-water-absorptivity composite binder for iron ore pellets

A technology of high water absorption and binder, which is applied in the field of metallurgical engineering materials, can solve the problems of reducing the iron grade of pellet ore, and the binder is difficult to adapt to the requirements of iron ore raw material moisture and pelletizing moisture, etc., to reach the total iron grade The effect of improving and reducing investment costs

Active Publication Date: 2015-11-25
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of the existence of binders in the production process of existing iron ore pellets that have strict requirements on the moisture content of iron ore raw materials, the use of bentonite will reduce the iron grade of pellets, and the existing binders are difficult to adapt to the moisture content of iron ore raw materials and pelletized moisture. Requirements and other issues; the purpose of the present invention is to provide a method for preparing a highly water-absorbing composite binder for iron ore pellets, the prepared composite binder has a higher water absorption capacity, and its 2h water absorption rate can reach 800% above

Method used

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  • Preparation method and application of high-water-absorptivity composite binder for iron ore pellets

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Mix sodium carboxymethylcellulose: sodium humate: bentonite: acrylic acid according to the mass percentage of 0.01:5:100:10, add water to make a mixed slurry; then use NaOH solution to adjust the neutralization degree of the mixed slurry to 70%; Add 0.1% of the initiator and 0.1% of the cross-linking agent in sequence, then place the mixed slurry at a temperature of 50°C and stir for 1 hour, then dry it at a temperature of 80°C, and break the dried sample And grind until the particle size of -0.074mm accounts for 99% by mass, thus obtaining a superabsorbent composite binder, and its 2h water absorption rate reaches 820%.

[0043] During application, the composite binder is added to the magnetite concentrate at a ratio of 0.5% of the dry mass of the magnetite concentrate and mixed evenly. The moisture content of the mixture is 9.0%, and the suitable moisture content of the obtained green balls is 9.6%. The drop strength is 4.2 times / 0.5m, the compressive strength is 14.2...

Embodiment 2

[0045] Sodium carboxymethyl cellulose: sodium humate: bentonite: acrylic acid is mixed evenly according to the mass percentage of 0.03:15:100:10, and water is added to make a mixed slurry; then NaOH solution is used to adjust the neutralization degree of the mixed slurry to 75%; Add 0.5% of the initiator and 1.0% of the cross-linking agent in sequence, place the mixed slurry at a temperature of 65°C and stir for 2 hours, then dry it at a temperature of 80°C, and break the dried sample And grind until the particle size of -0.074mm accounts for 99% by mass, thus obtaining a superabsorbent composite binder, and its 2h water absorption rate reaches 1260%.

[0046] In application, the composite binder is added to the magnetite concentrate according to the ratio of 0.75% of the dry mass of the magnetite concentrate and mixed evenly. The moisture content of the mixture is 9.7%, and the suitable moisture content of the obtained green balls is 10.4%. The drop strength is 7.5 times / 0.5m...

Embodiment 3

[0048] Sodium carboxymethyl cellulose: sodium humate: bentonite: acrylic acid is mixed evenly according to the mass percentage of 0.05:30:100:10, and water is added to make a mixed slurry; then the neutralization degree of the mixed slurry is adjusted to 80% by using NaOH solution; Add 1.0% of the initiator and 2.0% of the crosslinking agent in sequence, and place the mixed slurry at 80°C for 3 hours, then dry it at 80°C, and break the dried sample And grind until the particle size of -0.074mm accounts for 99% by mass, thus obtaining a superabsorbent composite binder, and its 2h water absorption rate reaches 1830%.

[0049] In application, the composite binder is added to the magnetite concentrate according to the proportion of 1.0% of the dry mass of the magnetite concentrate and mixed evenly. The moisture content of the mixture is 10.3%, and the suitable moisture content of the green ball obtained is 10.9%. The drop strength is 9.6 times / 0.5m, the compressive strength is 11....

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Abstract

The invention discloses a preparation method and application of high-water-absorptivity composite binder for iron ore pellets. Firstly, fine-ground calcium bentonite, sodium humate, sodium carboxymethyl cellulose and acrylic acid are mixed evenly, and then added with water to form mixed slurry; after the neutralization degree of the mixed slurry is adjusted through a sodium hydroxide solution, cross-linking agents and initiators are added for a reaction; and reaction products are dried, crushed and ground in sequence, and then the high-water-absorptivity composite binder is obtained. The prepared high-water-absorptivity composite binder is used for production of the iron ore pellets and has high adaptability to water in iron ore concentrate raw materials in the pelletizing process, the requirement for upper limit control over the water in the iron ore concentrate raw materials in the pelletizing process can be reduced, and the drying pretreating procedure of the iron ore raw materials during pellet production is simplified. In addition, by the application of the high-water-absorptivity composite binder, the use quantity of bentonite can be reduced remarkably, the total iron grade of finished pellet ore is improved, and industrial production requirements are met.

Description

technical field [0001] The invention relates to a preparation method and application of a highly water-absorbing composite binder for iron ore pellets, and belongs to the field of metallurgical engineering materials. Background technique [0002] In the existing production of iron ore pellets, the moisture control of iron concentrate raw materials is one of the important links to ensure the pelletizing efficiency. In particular, the concentrates in some concentrators are transported by pipelines, and are directly dehydrated after entering the pellet plant. Due to the limitation of the working efficiency of the existing dehydration devices, the moisture in the dehydrated iron concentrates is generally high, and the magnetite concentrates are generally high in moisture. The ore generally has a water content of 9.0-10%, while the hematite concentrate has a higher water content of 10-11%. Due to the large water content of iron concentrate raw materials, the suitable raw materia...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/244
Inventor 张元波姜涛李光辉范晓慧许斌孙阳刘兵兵周友连苏子键彭志伟黄柱成郭宇峰杨永斌李骞陈许玲游志雄陈军陈迎明杜明辉
Owner CENT SOUTH UNIV
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