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Wave-absorbing lightweight aggregate and preparation method

A lightweight aggregate and raw material technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve problems such as high water absorption, affecting the mechanical properties of cement-based wave-absorbing materials, and consuming natural resources

Active Publication Date: 2014-08-13
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In addition, porous cement-based materials are also widely used in the preparation of wave-absorbing cement-based materials, which have good wave-absorbing properties; the aggregates used in cement-based wave-absorbing materials are often obtained by artificial high-temperature treatment using natural minerals. For example, porous perlite and other minerals will consume a lot of natural resources; at the same time, the firing of porous aggregates is often a firing process of one pre-fired and one-time roasted, with a high water absorption rate, many connected pores, and low strength. Mechanical properties of the whole cement-based absorbing material

Method used

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Embodiment 1

[0039]A preparation method of light absorbing aggregate, which comprises the steps of:

[0040] 1) Selection of raw materials: water, shale, municipal domestic sludge and fly ash are used as raw materials, and mixed according to the ratio to obtain raw meal. Each gram of raw meal contains 0.23g of water, 0.615g of shale, and 0.154g of municipal domestic sludge. Fly ash is 0.001g;

[0041] 2) One-time forming: using anhydrous roll forming to form the raw material into raw material balls, and control the diameter of the raw material balls to 5mm-12mm;

[0042] 3) Primary pre-burning and roasting: Air-dry the raw meal balls for 24 hours, then heat them to 450°C under carbonaceous fuel for the first pre-burning, and the pre-burning time is 15 minutes; then place the pre-fired raw meal balls on carbon As for the high-quality fuel, it is roasted in a high-temperature furnace, the roasting temperature is about 1180 ° C, and the roasting time is 15 minutes. The pre-burning and roasti...

Embodiment 2

[0052] A preparation method of light absorbing aggregate, which comprises the steps of:

[0053] 1) Select raw materials: use water, shale, and municipal domestic sludge as raw materials, and mix them according to the ratio to obtain raw meal. Each gram of raw meal contains 0.13g of water, 0.696g of shale, and 0.174g of municipal domestic sludge;

[0054] 2) One-time molding: Use a disc granulator to turn the raw meal into raw meal balls, add water at 15% of the mass of the raw meal, and control the diameter of the raw meal balls to 5mm-12mm, air-dry the raw meal balls for 24 hours per gram of raw meal The water content of the ball is below 0.05g;

[0055] 3) Primary pre-burning and roasting: ,, and then heated to 500°C under carbonaceous fuel for the first pre-burning, the pre-burning time is 20min; then place the pre-burned raw pellets on the carbonaceous fuel, Roasting in a high temperature furnace, the calcination temperature is about 1200°C, the calcination time is 20min...

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Abstract

The invention relates to a wave-absorbing lightweight aggregate and a preparation method. The method includes following steps: 1) employing water, shale, civil domestic sludge and fly ash as raw materials, mixing the raw materials to obtain a rough material; 2) carrying out a one-step moulding process to obtain rough material balls; 3) first pre-burning and first roasting: carrying out a drying process, a first pre-burning process and a first roasting process to the rough material balls; 4) first cooling: slowly cooling and rapidly cooling the roasted rough material balls to obtain a semi-finished product of the lightweight aggregate; 5) second moulding: carrying out a water-saturating process to the semi-finished product of the lightweight aggregate, wrapping a fly ash layer or a shale layer on the semi-finished product and air-drying the semi-finished product; 6) carrying out a second pre-burning process and a second roasting process to obtain a shell semi-molten aggregate; 7) carrying out a second cooling process to obtain a core porous aggregate; 8) constructing a shell structure: wrapping a graphitic layer on the core porous aggregate, carrying out a heat-preservation process and a cooling process to obtain the wave-absorbing lightweight aggregate. The wave-absorbing lightweight aggregate can effectively improve strength performance and wave-absorbing performance of a lightweight aggregate and can improve combination performance between the lightweight aggregate and a concrete.

Description

technical field [0001] The invention relates to a wave-absorbing lightweight aggregate and a preparation method thereof, belonging to the field of chemical materials. Background technique [0002] With the rapid development of radio, television, microwave technology and other electronic technologies, the impact of electromagnetic wave pollution on the environment is becoming more and more serious. The wide application of radio frequency equipment has led to a substantial increase in the intensity of electromagnetic radiation in the human living environment, which directly threatens people's health; excessive electromagnetic wave radiation has caused invisible pollution, which has become a public nuisance that people are very concerned about. One of the environmental protection projects. Electromagnetic radiation pollution can cause malfunctions or obstacles of micro-current integrated circuit electronic systems or equipment, including interference in aviation communications...

Claims

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Application Information

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IPC IPC(8): C04B18/30
CPCY02W30/91
Inventor 丁庆军胡曙光黄修林王辰任婷
Owner WUHAN UNIV OF TECH
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