Preparation And Properties Of Composite Autoclaved Aerated Concrete Containing Copper Tailings And Ceramic Polished Mud

With the continuous advancement of industrialization and urbanization,more and more mineral resources have been utilized.Due to the imperfect mining technology and equipment,a large amount of industrial solid waste was brought after mining.A large amount of industrial solid waste has not achieved effective utilization,which is a tremendous waste and damage to resources and the environment.In order to solve this problem,we use copper tailings,which have a large discharge capacity and are not well treated yet,as our research goal and apply the new type of building materials prepared from copper tailings.Based on the preparation of autoclaved aerated concrete in copper tailings,the experimental study on the preparation of autoclaved aerated concrete by ceramic polishing mud and copper tailings was carried out to improve the problem of low compressive strength while use the existence of single-siliceous material of copper tailings for autoclaved aerated concrete.This study can effectively solve the problem of waste of resources and environmental pollution caused by traditional industrial solid waste,and bring new benefits to society.In this paper,copper tailings and ceramic polishing mud as the main research object,through autoclaved aerated concrete preparation test,the influence of particle fineness and blending amount of copper tailings and ceramic polishing mud on the proportion of autoclaved aerated concrete was studied,the technological parameters of copper tailing and ceramic polishing mud in the preparation of autoclaved aerated concrete were discussed.The macroscopic properties of the prepared autoclaved aerated concrete block such as compressive strength test,absolute dry density test,pore structure test and durability test as well as micro-performance tests such as XRD and SEM,the formation mechanism of autoclaved aerated concrete for the preparation of autoclaved aerated concrete using copper tailings and ceramic polishing mud was analyzed,providing theoretical support for the large-scale application of copper tailings and ceramic polishing mud.Through the mechanical grinding of copper tailings and ceramic polishing mud can effectively improve the content of active silica in the system,the grinding time were copper tailings grinding time 20min,ceramic polishing mud grinding time is 15min When the block prepared in compressive strength and absolute dry density composite national standards.The production process has the best mechanical properties and lower energy consumption when raw material ratio optimization and production process optimization,raw material quality percentage of copper tailings:ceramic polishing mud:cement:lime:gypsum at 40:25:10:22:3,the gas generating agent mass fraction of 0.1%,the ratio of water to feed is 0.65,water temperature is 50℃,static stop curing temperature is 50℃,curing time is 4 hours,autoclaved curing system is curing temperature 185℃ and constant pressure 8h.Ductile behavior of autoclaved aerated concrete block was studied.The main factors affecting the macroscopic performance of the block were that the overall pore structure of the block.The uniform and uniform distribution of block pore structure is beneficial to the compressive strength of the block,meanwhile,when these pores are not closed to each other,the thermal insulation performance and sound absorption performance of the block are improved;On the contrary,the high porosity of the block,the distribution of pore structure disorder,uneven pore size,closed pores less,the various physical properties of the block are poor.The autoclaved aerated concrete blocks were tested for microscopic performance.The results showed that the mineral phases of autoclaved aerated concrete blocks were dominated by the reaction of high-crystallinity and high-hardness tobobes,beimilon and less crystalline hydrated calcium silicate and amorphous gel and other products and unreacted quartz composition,needle-like or flake-shaped tobemelite,aluminum-substituted temepr mullite and unreacted quartz interpenetrate each other to form a dense pore structure,and the gel substance firmly binds these substances to form an integral body,making the block Macro-performance Compressive strength,durability,etc.are improved.