Desulfurization gypsum clinker-free steel slag cement

Abstract

The invention discloses desulfurization gypsum clinker-free steel slag cement. The cement is mainly prepared from the following components in percentage by weight: 10 to 30 percent of desulfurization gypsum, 32 to 70 percent of steel slag, 10 to 55 percent of mineral slag, 2.5 to 5 percent of cement clinker and 0 to 5 percent of hemihydrate gypsum. The cement does not need calcining treatment andhas no exhaust emission, so the cement reduces the energy consumption and has good environmental coordination; and meanwhile, the cement relieves the environmentally-friendly pressure of steel-iron power enterprises, reduces the resource shortage pressure of the enterprises, and achieves the effects of lightening the exhaust emission burden of the enterprises, increasing the income and improving the ecological environment.

Description

technical field [0001] The invention belongs to the technical field of cement, and in particular relates to a desulfurized gypsum clinker-free steel slag cement. Background technique [0002] Since the "Eleventh Five-Year Plan", the construction of desulfurization facilities in my country's thermal power plants has developed rapidly, and a large number of desulfurization facilities have been completed and put into operation. More than 90% of the equipment in the desulfurization facilities adopts the lime-gypsum desulfurization process, so it is accompanied by a large amount of desulfurization gypsum. . At the same time, my country's steel output has reached hundreds of millions of tons per year, and the resulting steel slag is as many as tens of millions of tons per year. The problem of effective utilization of desulfurized gypsum and steel slag will become increasingly prominent. [0003] At present, steel slag and desulfurized gypsum can only be used for low value-added ap...

AI Technical Summary

Problems solved by technology

[0003] At present, due to the complex composition of steel slag and desulfurized gypsum and the lack of strict quality control, they can only be used for low value-added applications such as foundation pit backfilling and road base laying.

However, these utilizations, on the one hand, have resulted in the ineffective recycling of steel slag and desulfurized gypsum, resulting in a large waste of natural resources; environmental damage

[0004] In addition, the production of cement generally requires the use of a large amount of mineral resources, and these mineral resources can be finally produced by grinding, high-temperature firing (calcination), ball milling, etc.; and the high-temperature firing (temperature up to 1400°C) process, On the one hand, it will cause a large loss of energy, which is a high energy-consuming process; on the other hand, every 1 ton of cement fired at high temperature is often accompanied by the production of about 1 ton of CO 2 , this high-temperature firing process to prepare cement will undoubtedly have a more serious impact on the atmospheric environment where the greenhouse effect is becoming more and more serious

[0005] On the one hand, the massive production and disposal of desulfurized gypsum and steel slag lead to waste of mineral resources; on the other hand, the continuous production of high energy-consuming cement, accompanied by the continuous mining of mine resources and 2 The ever-increasing emissions

This undoubtedly not only increases the burden on the environment, increases energy consumption, but also causes a lot of waste of mineral resources