Clinker free regenerated slag micro-powder compound cement

Abstract

The invention discloses clinker free regenerated slag micro-powder compound cement which is prepared by the following components in percentage: 25-35% of regenerated micro-powder, 35-45% of slag micro powder, 15-25% of mineral slag, 8-15% of desulfurization gypsum, 5-15% of alkali residue and 1-5% of additive based on total percentage of 100%. The clinker free regenerated slag micro-powder compound cement provided by the invention cannot only ensure the quality of cement, but also has the characteristics of adequately utilizing waste resources, reducing milling, reducing CO2 discharge, improving the environment and reducing the energy consumption.

Description

technical field [0001] The invention relates to the technical field of cement, in particular to a clinker-free steel slag recycled micropowder composite cement. Background technique [0002] With the acceleration of my country's infrastructure construction, the construction industry has entered a stage of rapid development. Waste concrete, as an important part of construction waste, is disposed of in open-air stacks or landfills, causing serious environmental pollution. Therefore, the utilization of waste has become Become one of the national environmental protection and sustainable development strategic goals. [0003] 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 ac...

AI Technical Summary

Problems solved by technology

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. As a solid waste of soda-making enterprises, alkali slag has not been effectively utilized for a long time

At present, wastes such as steel slag, alkali slag and desulfurized gypsum cannot be effectively recycled, resulting in a large waste of resources; cause serious 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 often produces about 1 ton of CO2. Atmospheric environment with increasingly serious greenhouse effect brings more serious impact

[0005] On the one hand, the massive production of waste concrete, steel slag, alkali slag, desulfurized gypsum, etc., waste of mineral resources caused by waste; increase

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