Sintering technology of cement clinker with directly doped steel slag in cement sintering system rotary kiln

Abstract

The invention discloses a sintering technology of cement clinker with directly doped steel slag in a cement sintering system rotary kiln. Steel slag in a molten state in a steel plant is processed by a hot smothering method; steel slag is cooled and cracked into particles; after magnetic screening, most steel is removed; then the steel slag is transported to a cement plant; after going through a buffer chamber, steel slag flows into a feed weigh; according to a preset flow, the steel slag is weighed; then the steel slag is transported to a sintering feed-end chamber platform; the steel slag is fed into a feed-end chamber ramp through dual wind blockage valves; steel slag flows into a rotary kiln, is mixed with other components of raw materials, and moves forward; and the high temperature flame from the coal-injection duct of the kiln head participate in the sintering chemical reactions to generate cement clinker. The target cement clinker comprises the following components: 67.47% of CaO, 22.50% of SiO2, 4.80% of Al2O3, 3.25% of Fe2O3, 2.00% of MgO, 0.5% of SO3, and 1.2% of f-Ca. The production and quality control are performed according to three values (KH, SM, and LM). Through the provided technology, the steel slag can be used as a resource in the cement industry; the grinding medium and electric energy are saved, the output of cement clinker is increased, and the space occupied by the steel slag is reduced.

Description

technical field [0001] The invention relates to the effective utilization of waste steel slag produced in the steelmaking process of a steel factory in a cement factory rotary kiln, in particular to a cement clinker firing process in which steel slag is directly infiltrated into the rotary kiln of a cement firing system. Background technique [0002] At present, my country's iron and steel plants produce a large number of by-products in the smelting process, and these by-products are collectively referred to as slag and steel slag. The chemical composition of the slag is close to that of the clinker produced by the cement factory. The slag in a high-temperature molten state is processed by water quenching and becomes granulated blast furnace slag. It has high chemical reactivity and has been fully utilized in the cement production process. , and achieved good social and economic benefits, slag has become a resource. However, the utilization of steel slag is far worse than t...

AI Technical Summary

Problems solved by technology

[0009] The technical problem to be solved by the present invention is: in order to overcome the existing defect that steel slag is used as a component of cement raw material and needs to go through the grinding process, the present invention provides a cement that is directly mixed with steel slag in the rotary kiln of the cement firing system. Clinker sintering process, which makes steel slag input into the rotary kiln and other components of raw meal for chemical reaction of cement sintering to produce cement clinker without going through the grinding process

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