A kind of concrete aggregate prepared by using coal gangue and preparation method thereof

Abstract

The invention relates to concrete aggregate prepared by utilizing coal gangue and a preparation method thereof. The concrete aggregate is prepared from the following raw materials in parts by weight: 110-150 parts of broken coal gangue, 50-70 parts of foundry waste sand, 10-20 parts of copper sludge, 10-20 parts of red mud, 50-70 parts of regenerated diatomite broken pieces, 5-9 parts of additives, 6-10 parts of calcium hydroxide and 5-9 parts of sodium hydroxide solution with the mass concentration of 0.5mol / L, wherein the regenerated diatomite broken pieces are prepared from the following components in parts by weight: 40-60 parts of waste diatomite slurry, 20-30 parts of modified steel slag micro-powder, 6-11 parts of a surface modifier and 0.04-0.06 part of a foaming agent; and the modified steel slag micro-powder is prepared from steel slag and sodium metaborate which accounts for 1 / 10 to 1 / 2 of the weight of the steel slag. According to the invention, a large-scale application direction is found for the coal gangue, foundry waste sand, copper sludge, red mud, steel slag and waste diatomite, the waste materials are changed into things of value, and the environmental pollution and land occupation caused by solid wastes are reduced, so that the resources are further utilized, and energy conservation and environment friendliness are achieved.

Description

Technical field [0001] The invention relates to the technical field of building materials, in particular to a concrete aggregate prepared from coal gangue and a preparation method thereof. Background technique [0002] Solidified waste, such as coal gangue, waste foundry sand, copper mud, red mud, steel slag, discarded diatomaceous earth, etc. The government invests a lot of money every year to bury and burn them deeply, which seriously wastes valuable land resources. The sulfide produced by incineration will destroy ozone if it enters the atmosphere, and the smoke produced will cause environmental pollution such as haze. Therefore, the use of solidified waste has very important practical significance and value. [0003] At present, many solidified wastes have been used to prepare concrete aggregates, thereby turning waste into treasure, reducing environmental pollution, greatly reducing construction costs, and having huge economic benefits. However, due to improper material selec...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problems of low strength, low density, high water absorption, easy pulverization, low aging and weather resistance, and low service life of concrete aggregates prepared from solidified waste, as well as the problems that aggregates are easily scattered during use, the invention The purpose is to provide a concrete aggregate prepared from coal gangue and a preparation method thereof. The concrete aggregate of the present invention has high strength, high density, low water absorption, is not easily pulverized, has higher aging resistance and weather resistance, and the bone is The material is not easy to scatter, and has a wide range of applications, suitable for promotion