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Liquid state binder capable of reinforcing iron ore sintering, its preparation and its application method

An application method and binder technology, which is applied in the field of liquid binder for strengthening iron ore sintering, can solve the problems of deterioration of thermal stability of granulation pellets, influence of air permeability during sintering process, and inability to withstand thermal shock, etc. Achieve the effects of strong cohesive force, low processing cost, and easy dispersion and mixing

Active Publication Date: 2012-06-27
CENT SOUTH UNIV
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  • Abstract
  • Description
  • Claims
  • 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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  • Liquid state binder capable of reinforcing iron ore sintering, its preparation and its application method
  • Liquid state binder capable of reinforcing iron ore sintering, its preparation and its application method

Examples

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Embodiment 1

[0020] Embodiment 1: liquid binder is made of ethylene-vinyl acetate copolymer latex powder, anionic polyacrylamide, SiO 2 Silica sol with a mass fraction of 40% and water are mixed in a weight ratio of 1.0:1.5:27.5:70, and prepared under the conditions of a temperature of 60° C. and a pH of 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, SiO 2 4.83%, 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 that without adding binder, and the utilization factor is increased by 0.17t / (m 2 h), the strength of the drum is basically the same.

Embodiment 2

[0021] Embodiment 2: liquid binder is made of vinyl acetate homopolymer latex powder, anionic polyacrylamide, SiO 2 Silica sol with a mass fraction of 35% and water are mixed in a weight ratio of 0.8:1.2:38:60, and prepared under the conditions of a temperature of 75° C. and a pH of 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. Add 58% vanadium-titanium magnetite into the sinter, and the chemical composition of the produced sinter is TFe50.64%, R2.28, SiO 2 4.37%, MgO2.51%, TiO 2 8.20%. 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 the sintering speed without adding liquid binder, and the utilization factor is increased by 0.13t / (m 2 h), the strength of the drum is basically the same.

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Abstract

The invention relates to a liquid state binder capable of reinforcing iron ore sintering, its preparation and its application method. The liquid state binder is prepared by the steps that redispersible latex powder, anionic polyacrylamide, silica sol with SiO2 having mass fraction of 30%-60% and water are mixed according to the proportion of 0.5-1.5: 1.0-2.0: 25-40: 56.5-73.5, uniformly stirred under the condition that the temperature is 50-80 DEG C and the pH value is 8-10 to prepare the product. the liquid state binder is used for sintering, the addition proportion accounts for 0.5-1.5% of total weight of the sintering raw material. Because the liquid state has the advantages of good dispersibility and strong adhesion stress, is capable of improving the granulation effect of the iron ore, raising heat stability of small granulating balls, greatly improving the permeability of a material layer during the sintering process, raising the sintering speed by 1.5-4mm / min and the utilization coefficient by 0.10-0.4t / (m<2>.h), and simultaneously ensuring the little change of the tumble strength of the sintered ore.

Description

technical field [0001] The invention belongs to the field of iron ore sintering, and relates to a liquid binder for strengthening iron ore sintering and a preparation and application 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 pr...

Claims

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Application Information

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IPC IPC(8): C22B1/243C22B1/16
Inventor 甘敏范晓慧陈许玲姜涛张振慧袁礼顺李光辉郭宇峰杨永斌张元波李骞黄柱成白国华许斌王强季志云余志远李文琦王祎
Owner CENT SOUTH UNIV
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