A kind of preparation method of cement substitute raw material

Abstract

The invention provides a method for preparing a substitutive raw material of cement, and belongs to the field of construction materials. According to the prepared calcium and silicon enriched substitutive raw material of cement, the emission load of CO2 gas of the cement industry and the unit clinker firing heat loss are reduced, and high-quality limestone is saved. The method comprises the following steps: adding pulverized fuel ash into wet discharged carbide slag with moisture content of 80-95 percent, wherein 14-20g of pulverized fuel ash is added into every 100g of the wet discharged carbide slag; and carrying out mechanical filter pressing to obtain the material with moisture content of 15-20 percent. Furthermore, an organic matter polyacrylamide is doped to serve as a dehydrating agent, and the moisture content of the carbide slag can be effectively reduced when the tempered carbide slag is mechanically dehydrated, and the minimum moisture content can be 15 percent. According to the method, the content of calcium oxide in the prepared material is not lower than 45 percent, the content of silicon oxide in the material is not lower than 17 percent, and the requirement on the quality of a cement raw material can be fulfilled. The cement prepared by using the principle is basically the same as conventional cement in chemical components, setting time, strength and other performances.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a preparation method of cement substitute raw materials. Background technique [0002] The cement industry emits CO per unit of GDP 2 relatively high industry. Limestone is used as raw material for cement firing, and about 0.8 tons of CO are emitted per ton of clinker produced. 2 , of which 2 / 3CO 2 from limestone CaCO 3 produced by decomposition. How to increase the intensity of energy conservation and emission reduction, and reduce the CO2 of cement unit output value 2 Reducing emissions is a major issue facing the cement industry, and it is also an unavoidable and arduous strategic task. With the rapid development of the cement industry, the use of industrial waste and low-quality raw materials to produce high-quality cement has become a hot topic. Therefore, preparing a cement raw material that can replace limestone is of great significance to the improvement of cement i...

AI Technical Summary

Problems solved by technology

However, due to the high water content of calcium carbide residue and good water retention, the wet calcium carbide residue liquid (water content up to 90%) is made into a filter cake with a water content of about 35% by means of concentration and pressure filtration. The calcium carbide residue filter cake with a water content of 35% is being transported , It is difficult to measure and control, and the composition of raw materials is easy to fluctuate, so the remaining moisture in carbide slag needs to be pre-dried to remove

The lower the final moisture content of calcium carbide slag drying, the better, but it requires too much heat, the output of a single machine is low, and the overall energy consumption is high

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