Light high-strength sludge ceramsite and preparation method thereof

Abstract

The invention relates to a light high-strength sludge ceramsite and a preparation method thereof. The preparation method comprises the following steps: S100, mixing sludge, fly ash, water glass, an ultrafine composite pore-forming agent and an auxiliary dispersant, and carrying out ultrasonic aging to obtain a raw material; S200, granulating and molding the raw material, and controlling the watercontent of molded raw material particles to be less than 0.5%; and S300, roasting and hardening the raw material particles obtained in the step S200 to obtain the light high-strength sludge ceramsite.A superfine composite pore-forming agent with superfine particles is selected as a gas-forming component, and the superfine composite pore-forming agent is uniformly dispersed into the material by adopting the auxiliary dispersant and an ultrasonic dispersing mode. By controlling a roasting system, different gas-forming components in the superfine composite pore-forming agent generate gas holes which are different in size and are uniformly and densely distributed to form a pore structure form of 'filling' macropore gaps with micropores, so that the lightweight high-strength sludge ceramsite is low in apparent density and high in strength, and the problem that the density and the strength are difficult to balance in a ceramsite preparation process is solved.

Description

technical field [0001] The invention relates to the field of material technology, in particular to a light-weight high-strength silt ceramsite and a preparation method thereof. Background technique [0002] Ceramsite is a kind of lightweight aggregate produced by foaming in a rotary kiln. It has low density, high cylinder compressive strength, high porosity, high softening coefficient, good frost resistance, good shock resistance and energy absorption, and alkali resistance The lightweight aggregate concrete prepared by using it has the advantages of high specific strength, good durability, good thermal insulation and fire resistance, good shock resistance and energy absorption effect, and excellent anti-alkali aggregate reactivity. It is widely used in industrial and civil buildings. and other projects have achieved large-scale application. The engineering application results show that using lightweight aggregate concrete instead of ordinary concrete for construction projec...

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Problems solved by technology

[0003] However, when ceramsite is used as aggregate to prepare building materials, there are some difficult problems to solve, which are mainly reflected in the contradictory relationship between low density and high strength of ceramsite: in order to make ceramsite have a lower density, often through Increasing the content of air-entraining components in the raw meal and increasing the roasting temperature will increase the internal gas generation of the ceramsite, and the internal pores of the prepared ceramsite will increase, and the density will decrease accordingly. However, at this time, due to the large internal gas generation of the ceramsite , The higher the firing temperature, the formed pores are easy to connect with each other, the glass phase material in the ceramsite is blocked by the connected pores, and the mechanical properties are significantly reduced; in order to make the ceramsite have higher strength, it is often necessary to increase the glass after the raw material is melted. The content and density of phases need to reduce the content of gas-generating components and lower the roasting temperature. At this time, the mechanical properties of the prepared ceramsite are improved, but the density is relatively high.

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