A process for firing cement clinker in liquid phase using blast furnace molten slag

Abstract

The invention relates to a technology for firing a cement clinker by utilizing a molten slag liquid phase of a blast furnace. A device comprises an iron-making blast furnace, a slag tank, a metering belt, a stock bin, a raw mill, a firing tank furnace, a dry quenching slag boiler, a clinker hopper, an intermediate bunker, a liquid feeding port, a melting chamber, a tricalcium silicate crystal chamber, an overflow chamber and a discharging port. The invention has the beneficial effects that the molten liquid slag is directly utilized, the temperature is about 1450 DEG C, the molten liquid slagis an excellent heat source, the sampling chemical test analysis for the molten liquid slag is adopted for supplementing the volume of the chemical element of the cement clinker and the slag is fullymixed and dispersed and reacts under the furnace temperature for keeping liquid state till the main mineral tricalcium silicate is generated; the cement clinker is lastly acquired in the manner of dryquenching, pelletizing and heat exchange in dry quenching slag boiler; the energy consumption of slag cooling and milling is reduced; the energy consumption of preheating, dewatering, decomposing andsintering for forming liquid phase in the present process of producing and firing the cement is reduced; the pollutant emission is reduced; the energy conservation and emission reduction are practically realized; the technology is a practical method for protecting environment.

Description

technical field [0001] The invention relates to the fields of iron and steel smelting and building materials, in particular to a process for firing cement clinker in the liquid phase using blast furnace molten slag. Background technique [0002] The temperature of the high-temperature molten liquid slag discharged from the blast furnace smelting process can reach above 1400°C, and the enthalpy of the blast furnace liquid slag is about 1700MJ / t, which is equivalent to the heat of 60Kg standard coal; blast furnace slag is composed of gangue in iron ore and ash in fuel And the solvent is generally a substance formed by non-volatile components in limestone. Its main components are calcium oxide, magnesium oxide, aluminum oxide, and silicon dioxide, accounting for about 95% of the total blast furnace slag. Blast furnace slag is a silicate material, and its chemical composition is similar to some natural ores and Portland cement. It can replace natural rocks and be used as raw mat...

AI Technical Summary

Problems solved by technology

[0007] The burning process of existing cement clinker consumes a lot of resources such as limestone and energy such as electricity and coal, and the slag used as a mixture from molten liquid slag to water-quenched slag also consumes a lot of water and electricity, and emits harmful gases , causing serious environmental pollution problems, drying, grinding and consuming a lot of energy

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