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A kind of preparation method of iron powder cold-pressed pellet composite binder

A technology for cold-pressed pellets and binders is applied in the field of preparation of composite binders for iron powder cold-pressed pellets. Healthy development, wide source of raw materials, and effect of reducing dosage

Inactive Publication Date: 2017-07-18
LANZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Traditional inorganic binders such as bentonite, diatomaceous earth, lime, water glass, borate, etc., can be used as effective binders to help the formation of pellets, but will increase harmful elements in iron concentrate, The iron grade decreases, the metallurgical performance of the pellets deteriorates, and even causes environmental pollution
Organic binders such as coal tar, asphalt, pulp waste liquid, syrup, soap, peat, acrylamide, Palido, etc. are volatilized or burned and decomposed during the pellet roasting process, which is beneficial to improving the iron grade of pellets; High price, poor high temperature resistance, pellets are easy to burst in the blast furnace, endangering the safety of the blast furnace, affecting the smelting efficiency, and cannot meet the requirements for use

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] ①Crush and sieve bentonite, fly ash, magnesium oxide, calcium carbonate, and gypsum respectively, and then crush and sieve the obtained coarse particles again, and the particle size reaches 100 mesh;

[0016] ② Add 15g of bentonite prepared above, 3.5g of rapid-hardening Portland cement, 1.5g of rapid-hardening sulfoaluminate cement, 3.0g of sodium carboxymethyl starch, and 3.0 grams of polyacrylamide into an iron cup with mechanical stirring. g, pregelatinized starch 5.0g, fly ash 2.0g, magnesium oxide 1.0g, calcium carbonate 1.0g, gypsum 1.0g, stir continuously for 15 minutes, stirring speed 150 r / min, make it mix evenly, get composite bond agent. Then add the obtained binder into the mixer, then add iron ore powder and stir quickly to make it evenly mixed; then pour the mixed material into the pelletizing machine and cold press it into balls. The prepared pellets were placed at room temperature for 5 hours, and the surface of the raw balls had hardened, and they cou...

Embodiment 2

[0018] ① Pulverize and sieve bentonite, fly ash, magnesium oxide, calcium carbonate and gypsum respectively, and then pulverize and sieve the obtained coarse particles again, and the particle size reaches 120 mesh;

[0019] ② Add 10g of prepared bentonite, 5.0g of rapid hardening Portland cement, 8.0g of sodium carboxymethyl starch, 1.0g of polyacrylamide, 6.0g of pregelatinized starch, 2.0g of fly ash, and magnesium oxide into the mixer in turn. 1.0g, calcium carbonate 1.0g, gypsum 1.0, cement superplasticizer 1.0g g, stirring continuously for 20 minutes at a stirring speed of 180 r / min, to mix evenly to obtain a composite binder. Then add the obtained composite binder into a mixer, then add iron ore powder and stir quickly to make it evenly mixed; then pour the mixed material into a pelletizing machine and cold press it into balls. The prepared pellets were placed at room temperature for 5 hours, and the surface of the raw balls had hardened, and they could be completely con...

Embodiment 3

[0021] ①Crush and sieve bentonite, fly ash, magnesium oxide, calcium carbonate, and gypsum respectively, and then crush and sieve the obtained coarse particles again, and the particle size reaches 100 mesh;

[0022] ②Add 13g of prepared bentonite, 5g of rapid-hardening portland cement, 1g of rapid-hardening sulphoaluminate cement, 6g of sodium carboxymethyl starch, 3g of polyacrylamide, 5g of pregelatinized starch, and fly ash into the mixer in turn. 2g, 1g of magnesium oxide, 1g of calcium carbonate, 1g of gypsum, and 0.5g of cement superplasticizer, stirring continuously for 15 minutes at a stirring speed of 160r / min to make them evenly mixed to obtain a composite binder. Then add the obtained composite binder into a mixer, then add iron ore powder and stir quickly to make it evenly mixed; then pour the mixed material into a pelletizing machine and cold press it into balls. After the prepared pellets were placed at room temperature for 5 hours, the surface of the raw balls h...

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Abstract

The invention discloses a preparation method for an iron powder cold-pressing pellet composite binder and belongs to the technical field of iron powder metallurgy pellet binders. The composite binder is formed by successfully compounding inorganic binders, organic binders and multiple kinds of auxiliaries. The iron powder cold-pressing pellet composite binder is composed of bentonite, rapid hardening portland cement, rapid hardening sulphate aluminum cement, sodium carboxymethyl starch, polyacrylamide, pregelatinized starch, coal ash, magnesium oxide, calcium carbonate, gypsum and cement water-reducing agents by the mass ratio of 10-15: 3.5-5.0: 0-1.5: 3-8: 1-3: 5-6: 2: 1: 1: 1: 0-1. The formula of the prepared binder reaches the purposes of reducing the use amount of the bentonite and improving the grade of pellets and the metallurgical performance. The composite binder is applied to iron powder cold-pressing forming, the iron powder pellets meeting the use requirement are obtained through pressing, and the property indexes of the raw pellet strength, burst temperature and finished pellet compressive strength all meet the quality requirement of pellets.

Description

technical field [0001] The invention relates to the technical field of metallurgical pellet binders, in particular to a preparation method of iron powder cold-pressed pellet composite binders. [0002] technical background [0003] With the development of modern blast furnace ironmaking towards high yield, low consumption, long life and the application of new iron and steel smelting technologies, pellets play an increasingly important role in the iron and steel industry and have become an indispensable high-quality blast furnace metallurgical charge. Domestic pellet production mainly uses bentonite as a binder, and its main components are inorganic substances such as silicate and alumina; the general dosage is 3-5%, which will cause high inorganic content in the pellets, iron The grade decreases; the amount of slag increases in blast furnace smelting, the energy consumption increases, the utilization coefficient of blast furnace decreases, and the coke ratio increases, which ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/242
Inventor 石赟罗亮
Owner LANZHOU UNIVERSITY
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