Molten iron heat insulation agent with metallurgical waste as raw material, and manufacturing and application method thereof

Abstract

The invention provides a molten iron heat insulation agent with metallurgical waste as a raw material, and a manufacturing and application method thereof. The molten iron heat insulation agent comprises, by weight, 40%-70% of dry quenching fly ash, 20%-42% of water quenching blast furnace slag, 4%-10% of expanded perlite and 3%-8% of bentonite. The molten iron heat insulation agent has the beneficial effects that the molten iron heat insulation agent is totally composed of light spheres and is free of scattering during field use and good in material coverage, and the field operation environment and the use efficiency of the heat insulation agent are obviously improved; 60% or more of the raw material of the molten iron heat insulation agent is composed of metallurgy waste which does not need to be mechanically processed or ground, and the cost of the raw material is low; the molten iron heat insulation agent can be closely bonded to the blast furnace slag on the surface of molten iron,can make slag to be formed easily, and is small in heat conductivity coefficient, stable and reliable in heat insulation effect and free of resulfurization, and the steelmaking cost is not increased;the slag accretion effect is good, the phenomenon of crusting of a molten iron bottle mouth is reduced, and the workload of manual slag removal is reduced; and the molten iron heat insulation agent has obvious economic benefits and environmental benefits.

Description

technical field [0001] The invention relates to the field of heat preservation of metallurgical melts, in particular to a heat preservation agent for molten iron using metallurgical waste as a raw material and a method for manufacturing and using the same. Background technique [0002] Hot metal tanks and torpedo tanks are basic equipment in ironworks. In the process of sending the molten iron produced by the blast furnace to the next process, there will inevitably be iron loss and temperature reduction, that is, heat loss. Relatively speaking, due to the poor insulation conditions of the open iron ladle, the temperature drop of the molten iron is significantly higher than that of the torpedo pot under the same conditions. [0003] The temperature of molten iron has a great influence on steelmaking. According to the converter smelting process, the heat of converter smelting basically comes from the physical heat and chemical heat of molten iron. Under the condition of cons...

AI Technical Summary

Problems solved by technology

But there are following problems in this invention, the one, the S content in the fly ash is relatively high, will increase molten iron [S] content when being used as main raw material for molten iron insulation, increased the molten iron pretreatment or converter smelting cost; The 2nd, added 3 ~5% fluorite, and F in fluorite seriously corrodes the lining of molten iron tanks and converters, and is not conducive to the control of molten steel refining process. At present, most iron and steel enterprises have minimized or even stopped adding fluorite to molten iron tanks or converters

And this invention also has the problem of dust pollution caused by fly ash and other fine particles during on-site use

[0007] However, metallurgical enterprises have a large amount of surplus CDQ dedusting ash, which has a carbon content of over 80%, is irregularly granular, has low density, high calorific value, and high porosity. , and because of its small particle size, it is easy to spontaneously ignite. It is mainly used for blast furnace injection at present, and there are few other utilization methods. It is difficult to effectively handle and safely place it when the surplus is large, and the cost is low.

[0008] In summary, the hot metal heat preservation agent in the prior art has problems such as poor heat preservation effect, high cost, large dosage, and serious dust pollution on the job site, which can no longer meet the actual needs of continuously reducing ironmaking costs. It is necessary to research and develop a low-cost heat preservation agent. , thermal insulation effect stable, less dusty hot metal thermal insulation agent