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Composite solid-waste lightweight high-strength haydite and preparation method therefor

A high-strength ceramsite and light-weight technology, applied in the field of resource utilization of solid waste, can solve the problems of green body strength decrease, poor molding stability, cracking in the drying process, etc., and achieve good heat insulation, earthquake resistance and heat insulation Effect

Inactive Publication Date: 2016-12-21
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0006] Aiming at the existing problems such as poor stability of ceramsite green bodies, cracks in the drying process, and reduction of green body strength caused by organic matter combustion, the present invention provides a light-weight, high-strength ceramsite and its main raw materials are municipal sludge and iron tailings. According to the preparation method, the urban sludge and iron tailings have a synergistic effect, which can realize the firing of ceramsite green bodies in a wide temperature range, avoiding the problems of small firing temperature range and component fluctuations interfering with product quality in traditional systems. During the molding and pre-firing process, the green body has high strength and stable size, and the performance of ceramsite is excellent: low bulk density and high cylinder compressive strength

Method used

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  • Composite solid-waste lightweight high-strength haydite and preparation method therefor

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preparation example Construction

[0056] A preparation method of composite solid waste lightweight high-strength ceramsite, such as figure 1 shown. Described preparation method comprises the steps:

[0057] (1) Mixing: Dry the wet sludge at 40-120°C, crush the obtained dry sludge or directly use wet sludge as raw material; mix the accurately weighed formula amount of dry sludge or wet sludge , iron tailings, auxiliary raw materials and foaming agent are put into the mixer and mixed evenly to obtain the basic mixture of ceramsite;

[0058] (2) Granulation: the ceramsite basic mixture is granulated to make ceramsite green particles with a diameter of 5.0-20.0mm;

[0059] (3) Drying: Coating the surface of the ceramsite green body particles with a layer of fly ash layer and drying at 40-120°C to obtain dry ceramsite green body particles;

[0060](4) Sintering: Sinter the dry particles of the ceramsite green body. The firing system is as follows: heat up to 600-650°C at a rate of 10.0-40.0°C / min, keep warm for ...

Embodiment 1

[0062] A method for preparing composite solid waste lightweight high-strength ceramsite, comprising the following steps:

[0063] (1) Put the municipal sludge in a drying oven at 40°C to dry and pulverize, accurately weigh 45.0kg of dewatered sludge, 40.0kg of iron tailings, and 15.0kg of auxiliary raw materials (including: 3.0kg of sodium carbonate, 2.0kg of Aluminum oxide, 10.0kg quartz sand), 0.5kg silicon carbide. Put the accurately weighed dewatered sludge, iron tailings, auxiliary raw materials and silicon carbide into the mixer and mix evenly to obtain the basic mixture of sludge and iron tailings ceramsite;

[0064] (2) Granulate the sludge combined with iron tail ceramsite base mixture to make spherical particles with a diameter of 5.0-20.0mm, and then coat a layer of fly ash layer on the surface of the spherical particles to obtain raw ceramsite Blank;

[0065] (3) placing the obtained sludge and iron tailings ceramsite green body in a 40°C oven to dry;

[0066] (...

Embodiment 2

[0069] A method for preparing composite solid waste lightweight high-strength ceramsite, comprising the following steps:

[0070] (1) Put the urban sludge in an 80°C drying oven to dry and pulverize it, and accurately weigh 40.0kg of dewatered sludge, 50.0kg of iron tailings, and 10.0kg of auxiliary raw materials (shale powder) according to the composition ratio For (by mass fraction): 44.40% SiO 2 , 27.73% Al 2 o 3 , 0.34% Na 2 O, 1.24% K 2 O, 10.77% CaO, 1.27% MgO, 5.56% Fe 2 o 3 ), 0.2kg silicon carbide; put the accurately weighed dewatered sludge, iron tailings, auxiliary raw materials and silicon carbide into the mixer and mix evenly to obtain the basic mixture of ceramsite;

[0071] (2) Granulate the sludge synergistic iron tail ceramsite base mixture to make spherical particles with a diameter of 5.0-20.0mm, and then coat a layer of fly ash layer on the surface of the spherical particles to obtain sludge synergistic Iron tailings ceramsite green body;

[0072] (...

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Abstract

The invention provides composite solid-waste lightweight high-strength haydite and a preparation method therefor. The composite solid-waste lightweight high-strength haydite is mainly prepared from the following raw materials in parts by weight: 40.0-60.0 parts of iron tailings, 10.0-15.0 parts of auxiliary raw materials and 0.1-3.0 parts of foamer. The composite solid-waste lightweight high-strength haydite further contains sludge, wherein the dry sludge content of the sludge is 30.0-50.0 parts. The preparation method comprises the steps: accurately weighing the sludge, the iron tailings, the auxiliary raw materials and the foamer according to a designed ingredient proportioning ratio, and carrying out uniform mixing so as to form a uniform basic mixture; and carrying out granulating and shaping so as to obtain unburned haydite, burning the unburned haydite, and carrying out annealing and cooling, thereby obtaining municipal sludge and iron tailing cooperated haydite. The haydite is prepared from the sludge and the iron tailings, which are cooperated with each other and serve as main raw materials, so that the sludge is subjected to harmless treatment and resource-converting utilization, the sludge, which is a municipal mineral product, is used for replacing a primary mineral raw material, and thus the economic and environmental benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and relates to a composite solid waste light-weight high-strength ceramsite and a preparation method thereof, in particular to a light-weight high-strength ceramsite prepared by municipal sludge in cooperation with iron tailings and the preparation thereof method. Background technique [0002] With the rapid development of social economy and the continuous improvement of the level of urbanization, the discharge of industrial sewage and urban domestic sewage in our country is increasing day by day, the rate of sewage collection and treatment and the depth of treatment are constantly improving, and the output of sludge is also increasing rapidly at a rate of 10% per year. Increase. Sludge contains organic matter and a large amount of inorganic matter (mainly silicon, aluminum, iron, calcium, etc.), which is similar to the raw material composition commonly used in many b...

Claims

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Application Information

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IPC IPC(8): C04B33/132C04B33/135C04B35/64C04B38/02C04B38/06C04B38/10
CPCC04B33/132C04B33/1321C04B33/1352C04B35/64C04B38/009C04B2235/3201C04B2235/3217C04B2235/3418C04B2235/3472C04B2235/349C04B2235/3826C04B2235/6562C04B2235/77C04B2235/96C04B38/10C04B38/02C04B38/06Y02P40/60
Inventor 曹建尉王志严明明赵庆朝
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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