Non-autoclaved aerated phosphogypsum-based concrete block preparation method

Abstract

The invention discloses a non-autoclaved aerated phosphogypsum-based concrete block preparation method and solves problems of high one-time investment, high energy consumption and easiness in crackingof aerated phosphogypsum-based concrete blocks in the prior art. The preparation method includes: preparing, by weight, 40-60 parts of ardealite, 5-15 parts of slag powder, 5-10 parts of carbide slag, 5-15 parts of coal ash, 25-40 parts of cement, 0.1-0.15 part of silica sol and 0.07-0.1 part of aluminum powder paste; adding the raw materials into a stirring tank, adding hot water, stirring, adding aluminum powder paste, and stirring to obtain mixed slurry; immediately discharging the mixed slurry from the stirring tank into a steel mould through a chute, and after pouring, sending through arail to a curing area to realize foaming and hardening; cutting a cured and hardened cast material into blocks, and performing normal-temperature moisture curing; transferring through the rail to a natural drying and dewatering area to pile up, and detecting to obtain a qualified finished product. The method has advantages that making full use of industrial byproducts is realized, investment reduction and energy consumption reduction are realized, and the prepared product is high in quality and less prone to cracking.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a method for preparing autoclaved aerated phosphogypsum-based concrete blocks. Background technique [0002] my country is the world's largest producer of phosphate fertilizers, but the actual utilization rate of the by-product phosphogypsum is less than 30%, the stockpiles have exceeded 300 million tons, and the newly-increased stockpiles are 50 million tons every year, covering an additional area of ​​more than 4,000 hectares. In addition to occupying a large area of ​​land, the accumulation of a large amount of phosphogypsum may also cause environmental problems such as dust, groundwater and soil pollution, and disasters such as landslides, which has become a major bottleneck restricting the development of the phosphate fertilizer industry. How to comprehensively utilize phosphogypsum is an urgent problem in my country and even the world. Tests have shown th...

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Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a method for preparing an autoclaved aerated phosphogypsum-based concrete block, which solves the problem of large one-time investment, high energy consumption, and easy cracking problem

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