Straw ash molded building material free of burning and its preparation method

Abstract

The invention discloses a straw ash molded building material free of burning. Mainly prepared from straw ash, cement, gypsum and quicklime, the molded building material contains a potassium salt and/or potassium oxide from straw ash. The preparation method of the molded building material adopts the following raw materials of: 50-70 parts by weight of straw ash, 5-10 parts by weight of cement, 5-15 parts by weight of gypsum, 5-15 parts by weight of quicklime, and 2-5 parts by weight of an accelerating agent. And the preparation process comprises: (1) mixing straw ash, gypsum, quicklime and cement uniformly under room temperature and normal pressure, then adding water accounting for 28-40 wt% of the mixed powder into the powder and conducting stirring till the mixed powder turns into a muddy state, then adding an accelerating agent and mixing them uniformly; and (2) adding the muddy mixture prepared in step (1) into a mold, and carrying out vibration molding under room temperature and normal pressure, then performing demolding and taking out a billet, which is then placed indoors for complete curing under room temperature and normal pressure.

Description

technical field [0001] The invention belongs to the field of building materials, and relates to a straw ash and slag-free building material prepared by using straw ash and a preparation method thereof. Background technique [0002] my country is a large agricultural country. According to literature reports, my country's annual crop straw exceeds 700 million tons, and wheat straw reaches 100 million tons, ranking first in the world. In recent years, under the encouragement of the government, the recycling of crop straw has been further developed. In addition to the traditional crushing and returning to the field and processing feed, it is also used for papermaking and building decoration materials. According to reports, about 15% of the straw is returned to the field, about 16% is used as feed, about 3% is used as industrial raw materials, and nearly 70% of the other straw is not recycled, and many of them are burned in the atmosphere, and only 15% is burned. Efficiency is t...

AI Technical Summary

Problems solved by technology

Although the ash residue after straw burning can be used as fertilizer, its fertilizer effect is not as good as the current compound fertilizer, and the amount used as fertilizer is very limited. Therefore, the utilization of straw ash residue is an urgent problem to be solved, otherwise it will cause serious damage to the environment. Pollution, and affect the development of thermal power plants that directly burn straw

[0005] CN101844883A discloses a new type of composite ecological cement and the application of its products. Although the patent application involves using straw ash as a raw material to prepare composite ecological cement, and using the composite ecological cement to prepare building products, there are many other components in the raw materials. The content of straw ash is low, especially for unburned bricks prepared by it. Straw ash only accounts for 3.3% of the weight of unburned bricks. Moreover, the E component of the composite ecological cement in this patent application is an organic polymer compound, such as urine Aldehyde resin, VAE emulsion, cellulose, etc. will pollute the environment and cause damage to the human body during production and use