Clinker-free baking-free fly ash polymer cement

Abstract

A burn-free fly ash ground polymer cement is characterized in that the cement contains the following components with the weight percentage of 65-86 percent of low-calcium fly ash, 4-20 percent of calcium containing compound, 10-18 percent of alkali excitant and 0-5 percent of admixture. And the calcium containing compound is one or a mixture of more than two of phosphorous slag, kiln dust or lime; the alkali excitant is the composite of NaOH or KOH with rapidly dissolved powdery sodium silicate, liquid silica sol and industrial water glass; the admixture is early strength agent and/or water reducing agent.

Description

1. Technical Field [0001] The present invention relates to a technology for producing polymerized cement using industrial waste slag and fly ash. Specifically, it is a kind of non-clinker and non-burning fly ash polymerized cement. 2. Background technology [0002] As we all know, the production process of Portland cement has high energy consumption, serious pollution, under-utilization of resources, and the annual discharge of fly ash in China reaches more than 200 million tons, and its cumulative storage volume is about 4 billion tons, covering an area of ​​40,000 to 50,000 hectares. , Which intensified environmental pollution and caused a huge waste of energy and resources. However, the annual utilization rate of fly ash in China is only 30% to 40%, and a considerable part of it is only used as a filling material, and the fly ash is not fully explored. Ash is a valuable resource of silica and alumina; the concept of geopolymer cement comes from the French professor Davidovits....

AI Technical Summary

Problems solved by technology

This kind of cement consumes 525 grade cement clinker and slag, and uses activated silica and calcium oxide. The composition of the composite activator is complex, and the resources are greatly limited. At the same time, the output of fly ash is small, and its production process is relatively complicated. Coal ash and water-quenched slag need to be stored, dried and dehydrated, so the production time is long and it is difficult to popularize and use

Chinese invention patent application publication number CN1173472A discloses "a kind of fly ash cement admixture" patent application again, and this patent application discloses a kind of using fly ash, alkaline activator (calcium hydroxide) and sodium phosphate) to produce fly ash-free cement admixture, the admixture has a low amount of fly ash, consumes 525R cement clinker, calcium hydroxide resources and sodium silicate, and the cost is high, so it is difficult to popularize and apply

The Chinese Invention Patent Application Publication No. CN1468824A discloses a patent application for "the method of producing cement with a large amount of fly ash". Grinding consumes resources such as gypsum, clinker and slag, the amount of fly ash is still not high, the production process is complicated, the cost is high, and it is difficult to popularize and apply