Block prepared from river sand and its preparation method

Abstract

The invention discloses a building block made of quartz sand as a raw material and a preparation method of the building block, and solves problems of low reactivity of quartz sand, difficulty in grinding, high energy consumption and the like in the conventional building blocks. The building block provided by the invention is prepared from the following raw materials in parts by weight: 55-65 parts of quartz sand, 10-15 parts of carbide slag, 10-20 parts of silicon-aluminum active admixture, 6-8 parts of lime, 2-3 parts of cement, 3-7 parts of additive and 8-10 parts of acid solution with concentration of 5%. The preparation method comprises the following steps: firstly mixing and grinding quartz sand with the acid solution; then, adding the other components to be grinded to obtain slurry; placing the slurry in a stirring machine; adding cement and additive to be stirred and formed; then, performing gas release, blank repairing and steam pressing to obtain a sand aerated building block. The building block provided by the invention is simple in process, low in production cost, high in reactivity, excellent in performance, low in energy consumption and friendly to the environment.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a block prepared from river sand as a raw material and a preparation method thereof. Background technique [0002] Autoclaved aerated concrete series products have light weight, good thermal insulation performance, and good sound-absorbing effect. Therefore, my country has become a big country in the preparation of this new type of building material. The supply is tight, resulting in the poor effect of the autoclaved aerated concrete blocks produced, and the quality cannot be guaranteed), which greatly increases the difficulty of developing sand aerated concrete blocks. River sand (that is, quartz sand) has the characteristics of good water stability, strong water permeability, fast subsidence, easy compaction, and small rise of capillary water. River sand is used as raw material for preparing sand aerated blocks, and local geographical advantages are used. Sustainable developme...

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Problems solved by technology

At present, there have been quite a few studies on the preparation of sand aerated blocks using river sand as the main raw material, but none of them have solved the problem of the reactivity of quartz sand well.

For example, the patent number is 200510042450.8, and the invention name is "Engineering blocks made of stone powder as raw material and its manufacturing process". The invention patent application uses dry stone powder, river sand, crushed stone and cement as raw materials, after stone powder pretreatment, It is made by batching, stirring, forming and curing. The raw materials are firstly dry-milled and then mixed with water and mechanically mixed to form. It is generally believed that this method can achieve better slurry stability and different requirements for different raw materials. treatment to improve product performance, but the method of mixing and stirring after dry grinding still has the following problems: quartz sand and other waste materials are affected by their preparation process, and their discharge methods are all wet discharge, which is limited by the feed content of dry grinding. Due to the water requirement, it is necessary to dry the raw materials, which leads to high energy consumption, long production cycle, and high cost; and the particle size of quartz sand is large, and the reaction is not thorough enough

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