Mixed calcined cement admixture being produced through utilizing papermaking white mud, shale and coal gangue

Abstract

The invention discloses a mixed calcined cement admixture being produced through utilizing papermaking white mud, shale and coal gangue. The cement admixture is obtained through mixing waste papermaking white mud, shale with rich reserves and coal gangue with low prices according to a certain ratio, aging, forming, drying, calcining and cooling. The pozzolanic activity of the cement admixture is equivalent to that of second-level pulverized fuel ash, and the cement admixture can be used for partially or completely substituting for pulverized fuel ash or other cement admixtures. According to the mixed calcined cement admixture produced through solid wastes of the papermaking white mud and the like, the cement performance is improved, energy is saved, emission is reduced, wastes are turned into wealth, the environmental protection is benefited, moreover, the cement admixture is low in production cost and considerable in profit, the increasing shortage situation of the cement admixture can also be relieved, and obvious social benefit and economic benefit are obtained.

Description

technical field [0001] The invention specifically relates to a cement admixture made by co-firing papermaking white mud, shale and coal gangue, and belongs to the technical field of portland cement. Background technique [0002] The production of cement consumes a lot of energy and mineral resources such as limestone and clay, and also discharges a lot of pollutants. At the same time, the discharge of industrial waste residues (fly ash, blast furnace slag, coal gangue, papermaking lime mud, etc.) has increased year by year, which not only occupies a large amount of land, but even pollutes water sources, air, and soil, bringing great harm to economic construction and people's lives. Great harm. A large number of research results show that the use of industrial waste residues as cement admixtures not only effectively utilizes industrial waste residues, reduces environmental pollution and land occupation caused by waste residues, reduces cement production costs, but also reduc...

AI Technical Summary

Problems solved by technology

[0005] my country has become a big country of paper production, consumption, and import. Paper production and consumption account for 23.3% and 23.1% of the world's total respectively. Such a large paper production will inevitably cause a large amount of papermaking white mud waste. At present, a large Most enterprises use landfill or stacking to dispose of paper-making white mud. Although landfill treatment is simple and easy and requires less investment, it requires a large amount of land resources. In addition, due to compaction, rainfall and microbial decomposition during the sludge landfill For reasons such as high-concentration leachate and the dissolution of residual alkali will be produced, causing groundwater pollution

The long-term accumulation of white mud yards still has the risk of collapse under severe weather conditions, which has become a hidden danger of social harm

[0006] Looking at the research and development of comprehensive utilization of lime mud at home and abroad in recent years, there are still various technical obstacles in the comprehensive utilization of lime mud for pulping and papermaking, or it is difficult to popularize due to the influence of economic benefits, especially the industrialization of non-wood pulp and papermaking lime mud There is little precedent for promotional apps