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Iron ore liquid binder and preparation method thereof

A binder and liquid technology, which is applied in the field of iron ore liquid binder and its preparation, can solve the problems of deterioration of thermal stability of pelletized pellets, affecting the permeability of sintering process, and being unable to withstand thermal shock. The effect of strong adhesion, low processing cost, and easy dispersion and mixing

Inactive Publication Date: 2017-12-15
如皋市玉辉助剂厂
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  • Summary
  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, there are incompletely digested quicklime particles in the granulation pellets, and their volume will expand more than double during further digestion during the sintering and drying process, which will destroy the pellets and produce powder, which will affect the air permeability of the sintering process. The problem is particularly prominent when it is applied in the sintering of difficult-to-granulate iron ore
However, under the alkaline environment of sintering, due to the presence of a large amount of calcium and magnesium ions, ion exchange occurs and the bonding effect is not good.
However, the application of organic binders has the disadvantages of small amount of addition and difficulty in mixing. Although it has high mechanical strength at room temperature, the thermal stability of granulated pellets deteriorates due to premature decomposition of organic matter at high temperatures. Unable to withstand thermal shock of high temperature process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1: liquid binding agent is mixed according to the weight ratio of 1.0: 1.5: 27.5: 70 by ethylene-vinyl acetate copolymer latex powder, anionic polyacrylamide, SiO Mass fraction is 40%, water, at temperature It was prepared under the conditions of 60°C and pH 9. The liquid binder was applied to the sintering of specularite (see Table 1 for composition), and the results are shown in Table 2. Add 35% specularite to the sinter, and the chemical composition of the produced sinter is TFe57.63%, R2.00, SiO24.83%, MgO2.00%. Add 1% liquid binder to the sintered material, mix and granulate for 4 minutes, then ignite and sinter. It can be seen from Table 2 that when 1.0% liquid binder is added for sintering, the sintering speed is 2.27mm / min faster than the sintering speed without adding binder, and the utilization factor is increased by 0.17t / (m2·h). Basically the same.

Embodiment 2

[0021] Embodiment 2: the liquid binding agent is mixed according to the weight ratio of 0.8: 1.2: 38: 60 by vinyl acetate homopolymer latex powder, anionic polyacrylamide, SiO Mass fraction of 35%, water at a temperature of Prepared under the conditions of 75°C and pH 9.5. The liquid binder was applied to the sintering of vanadium-titanium magnetite (see Table 1 for the composition), and the results are shown in Table 2. Adding 58% vanadium-titanium magnetite into the sintering material, the chemical composition of the produced sintering ore is TFe50.64%, R2.28, SiO24.37%, MgO2.51%, TiO28.20%. Add 1.5% liquid binder to the sintered material, mix and granulate for 4 minutes, then ignite and sinter. It can be seen from Table 2 that, adding 1.5% liquid binder for sintering, the sintering speed is 2.25mm / min faster than that without adding liquid binder, and the utilization factor is increased by 0.13t / (m2 h). The strength is basically the same.

[0022] Table 1 Chemical Compos...

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Abstract

The invention relates to an iron ore liquid binder and a preparation method thereof. The liquid binder is made of redispersible latex powder, anionic polyacrylamide, silica sol with a SiO2 mass fraction of 30% to 60%, and water by mass. It is prepared by mixing at a ratio of 0.5-1.5:1.0-2.0:25-40:56.5-73.5, and stirring evenly under the conditions of temperature 50-80°C and pH value 8-10. The liquid binder is applied to sintering, and its addition ratio is 0.5-1.5% of the total weight of sintering raw materials. Due to the good dispersion and strong cohesive force of the liquid binder, it can improve the effect of iron ore granulation and the thermal stability of the granulation pellets, greatly improve the air permeability of the material layer during the sintering process, thereby increasing the sintering speed by 1.5-4mm / min, the utilization factor is 0.10~0.4t / (m2·h), and at the same time, it is ensured that the strength of the sinter drum does not change much.

Description

technical field [0001] The invention belongs to the field of iron ore sintering, and relates to an iron ore liquid binder and a preparation method thereof. Background technique [0002] As the basic raw material industry of the national economy, the iron and steel industry plays an important role in economic development. Iron ore sintering is currently the most widely used iron-containing raw material agglomeration method in domestic and foreign iron and steel enterprises. It provides blast furnaces with a certain particle size, strength and stable chemical composition. The technical indicators of sintering directly affect the effect of blast furnace smelting, production costs and product quality. [0003] At present, the proportion of sintered ore in my country accounts for 80% of the blast furnace iron-containing charge, and its demand is very huge. In recent years, in addition to investing in new sintering machines to expand production capacity, my country's iron and st...

Claims

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Application Information

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IPC IPC(8): C22B1/242C22B1/16
CPCC22B1/242C22B1/16
Inventor 陈修玲
Owner 如皋市玉辉助剂厂
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