Method for preparing light thermal-insulating wall material by virtue of coal gangue

Abstract

The method discloses a method for preparing a light thermal-insulating wall material by virtue of coal gangue. The thermal-insulating wall material which is light in weight and high in strength is prepared from coal gangue, a fluxing agent and a foaming agent through processes of grinding, homogenizing, granulating, sintering at high temperature, foaming and the like. The thermal-insulating wall material disclosed by invention is high in mixing amount of coal gangue, and by virtue of heat generated from sufficient burning of residual carbon in the coal gangue, the wall material can be used for basically meeting a sintering requirement, so that fuel is saved and production cost is greatly reduced. The thermal-insulating wall material disclosed by the invention has the characteristics of being light in weight and high in strength, volume density is 250-600kg / m3, compressive strength is 3.0-11.0MPa and a heat conductivity coefficient is 0.08-0.13W / (m.k), therefore the wall material is a novel thermal-insulating wall material which integrates heat insulation, waterproofing, fireproofing, corrosion resistance and aging resistance properties; and the wall material can be used as a self-thermal-insulating wall material when being cut into a building block, and can be used as a light partition board when being cut into a slab.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a method for preparing lightweight thermal insulation wall materials by using coal gangue. Background technique [0002] Coal gangue is coal-associated waste rock, solid waste discharged during the excavation, mining and coal washing process, which is a mixture of carbonaceous, muddy and sandy shale, and has a certain calorific value. my country's annual emissions are 600 million tons, and more than 5 billion tons have been piled up so far, making it one of the largest industrial solid wastes in China. The discharge and accumulation of coal gangue not only causes waste of resources, occupies land, but also has certain hidden dangers such as environmental pollution. According to relevant reports, the utilization of coal gangue in some foreign countries has reached more than 90%, while the utilization rate of coal gangue in my country is only about 30% at this stage, mainly used ...

AI Technical Summary

Problems solved by technology

The discharge and accumulation of coal gangue not only causes waste of resources, occupies land, but also has certain hidden dangers such as environmental pollution.

According to relevant reports, the utilization of coal gangue in some foreign countries has reached more than 90%, while the utilization rate of coal gangue in my country is only about 30% at this stage, mainly used for power generation, extraction of various aluminum compounds, building bricks, etc. On the one hand, although these applications have realized partial resource utilization of coal gangue, the utilization rate is low and may even cause secondary pollution

[0003] At present, the external wall in my country generally adopts the wall structure of autoclaved aerated concrete blocks plus insulation layer. The wall structure is complex and has been constructed many times, and the wall integrity is poor.

Commonly used autoclaved aerated concrete blocks have shortcomings such as high water absorption, poor frost resistance, low strength, and high thermal conductivity. Short and other defects

However, the cement-based lightweight partition walls commonly used in interior walls have the problem of easy shrinkage and cracking; the existing foamed ceramic insulation boards have a narrow firing temperature (high requirements for sintering temperature control), and need to be wet-milled and spray-dried , tunnel kiln single-layer firing and other high-energy-consuming processes lead to high production costs and poor market competition

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