A method suitable for preparing cold-set pellets from iron-containing sludge using composite adhesives

A technology of composite adhesive and cold-set pellets, which is applied in the field of adhesives for metallurgical ironmaking, can solve the problems of lowering the iron grade of cold-set pellets, lowering the iron-containing grade of pellets, affecting smelting energy consumption and output, etc. The effect of energy consumption, improving iron content and reducing secondary pollution

Inactive Publication Date: 2011-12-07
TONGJI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's pellets are added with an average of 4% bentonite, the most of which reaches 7-8%, and the least is no less than 2.5%, so that the iron-containing grade of the pellets decreases, which affects the energy consumption and output of smelting. Blast furnace ironmaking causes huge economic losses, and SiO2 in bentonite can also inhibit the reduction of iron, so it is urgent to develop new binders
[0005] In the process of producing cold-set pellets, if only inorganic adhesive is added, it will not only increase the cost of pelletizing, but also reduce the iron grade of cold-set pellets, which greatly restricts the use of cold-set agglomeration technology; if Only adding organic adhesives will not only reduce the bonding strength at high temperature, but also cause the thermal strength of the pellets to decrease, and even cause the pellets to burst at high temperatures

Method used

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  • A method suitable for preparing cold-set pellets from iron-containing sludge using composite adhesives
  • A method suitable for preparing cold-set pellets from iron-containing sludge using composite adhesives
  • A method suitable for preparing cold-set pellets from iron-containing sludge using composite adhesives

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Composite adhesive formula is as follows: (calculated by weight fraction)

[0024]

[0025] Add vinyl acetate, acrylic acid, and sodium carboxymethyl cellulose into the four-neck bottle according to the proportion, then add water according to the proportion, stir at 90°C and 1500 rpm until the glue is evenly mixed, and then mix the glue Pour out the solution and cool it to room temperature, and finally mix the cooled glue solution with molasses evenly according to the proportion to obtain the organic adhesive A. Take bentonite, calcium oxide, high-temperature cement, and alkaline sodium hydroxide according to the proportion, and mix them evenly to obtain inorganic adhesive B.

[0026] According to the proportion, the organic adhesive A and the inorganic adhesive B are compounded and stirred evenly (the compounding ratio is 1: 1), and then added in the mixture of iron concentrate powder and iron-containing sludge according to the proportioning (the mixing ratio is: co...

Embodiment 2

[0028] Composite adhesive formula is as follows: (calculated by weight fraction)

[0029]

[0030] Add vinyl acetate, acrylic acid, and sodium carboxymethyl cellulose into the four-neck bottle according to the proportion, then add water according to the proportion, stir at 90°C and 1500 rpm until the glue is evenly mixed, and then mix the glue Pour out the solution and cool it to room temperature, and finally mix the cooled glue solution with molasses evenly according to the proportion to obtain the organic adhesive A. Take bentonite, calcium oxide, high-temperature cement, and alkaline sodium hydroxide according to the proportion, and mix them evenly to obtain inorganic adhesive B.

[0031] According to the proportion, the organic adhesive A and the inorganic adhesive B are compounded and stirred evenly (the compounding ratio is 1: 1), and then added in the mixture of iron concentrate powder and iron-containing sludge according to the proportioning (the mixing ratio is: co...

Embodiment 3

[0033] Composite adhesive formula is as follows: (calculated by weight fraction)

[0034]

[0035] Add vinyl acetate, acrylic acid, and sodium carboxymethyl cellulose into the four-neck bottle according to the proportion, then add water according to the proportion, stir at 90°C and 1500 rpm until the glue is evenly mixed, and then mix the glue Pour out the solution and cool it to room temperature, and finally mix the cooled glue solution with molasses evenly according to the proportion to obtain the organic adhesive A. Take bentonite, calcium oxide, high-temperature cement, and alkaline sodium hydroxide according to the proportion, and mix them evenly to obtain inorganic adhesive B.

[0036] According to the proportion, the organic adhesive A and the inorganic adhesive B are compounded and stirred evenly (the compounding ratio is 1: 1), and then added in the mixture of iron concentrate powder and iron-containing sludge according to the proportioning (the mixing ratio is: co...

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Abstract

The invention belongs to the technical field of adhesives for metallurgical ironmaking, and is suitable for a method for preparing cold-set pellets from iron-containing sludge using composite adhesives. The specific steps are: use a composite adhesive that uses both inorganic and organic adhesives. The raw materials used for the organic adhesive in the adhesive are vinyl acetate, acrylic acid, sodium carboxymethyl cellulose, polyvinyl alcohol, polyisobutylene, molasses and coal tar, inorganic The raw materials used in the adhesive are bentonite, calcium oxide, alkaline sodium hydroxide, sodium chloride, talcum powder and light calcium carbonate; when the organic adhesive and inorganic adhesive in this adhesive are prepared, each component must be strictly prepared in a certain order. Controlling the ratio can not only avoid the shortcomings of using a certain type of adhesive alone, but also have good adhesion to iron-containing sludge. The invention recovers iron from iron-containing sludge and turns waste into resources, thus not only reducing storage and transportation links and environmental pollution, but also saving energy consumption in sintering and blast furnace production links.

Description

technical field [0001] The invention belongs to the technical field of adhesives for metallurgical ironmaking, and in particular relates to a method suitable for preparing cold-set pellets by using composite adhesives in iron-containing sludge. Background technique [0002] In the production of iron-making blast furnaces and steel-making converters in iron and steel enterprises, a large amount of smoke and dust are produced, which are processed and recycled to obtain iron-containing sludge (mainly containing Fe, C, CaO and other substances) through environmental protection and dust removal. This iron-containing sludge mainly includes converter sludge and blast furnace sludge. The sludge has a large water content, and it cannot be mixed evenly when directly mixed with raw materials, and it is easy to cause the belt to stick and the feed port to be blocked during the belt conveying process. The dried sludge slabs can't be used as raw materials even if they become agglomerated....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 任天斌黄超韩宇朱金鑫钟震
Owner TONGJI UNIV
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