Method for producing porcelain granule light weight aggregate with sewage sludge

A lightweight aggregate and ceramsite technology, applied in the production of ceramic materials, dehydration/drying/concentrated sludge treatment, application, etc., can solve the problems of high sintering temperature and low sludge mixing ratio

Inactive Publication Date: 2008-06-11
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the disadvantages of low mixing ratio of existing process sludge, high sintering temperature and the addition of clay prohibited by the state, the present invention provides a method of using sludge as the building material under the premise of ensuring the performance of ceramsite lightweight aggregate products. Method for producing lightweight aggregate ceramsite by low-temperature sintering at 1080-1100°C as main raw material and without adding clay

Method used

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  • Method for producing porcelain granule light weight aggregate with sewage sludge
  • Method for producing porcelain granule light weight aggregate with sewage sludge

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Embodiment 1

[0027] In this embodiment, the amount of fly ash added accounts for 18% of the dry sludge mass, and the sintering temperature is 1080°C. The preparation method steps are as follows:

[0028] a. Firstly, heat-dry the dewatered sludge, and use a paddle dryer to dry at 180°C for 2 hours to obtain dry sludge with a moisture content of <10%;

[0029] b. The universal pulverizer crushes and sieves through a 45mm sieve;

[0030] c. Add fly ash with 18% dry sludge mass according to the raw material ratio of the process, and stir with a cement slurry mixer for 5 minutes, and mix evenly;

[0031] d, 8 MPa powder extrusion molding machine to obtain lightweight aggregate ceramsite blank;

[0032] e. Preheat at 350°C for 20 minutes. The purpose of preheating is mainly to reduce the content of organic matter in the billet and avoid cracking of the billet during sintering; sinter at 1080°C for 30 minutes;

[0033] f, the product is obtained after natural cooling.

Embodiment 2

[0035] In this embodiment, the amount of fly ash added accounts for 25% of the dry sludge mass, and the sintering temperature is 1100°C. The preparation method steps are as follows:

[0036] a. Firstly, heat-dry the dewatered sludge, and use a paddle dryer to dry at 180°C for 2 hours to obtain dry sludge with a moisture content of <10%;

[0037] b. The universal pulverizer crushes and sieves through a 45mm sieve;

[0038] c. Add fly ash with 25% dry sludge mass according to the raw material ratio of the process, and stir with a cement slurry mixer for 5 minutes to mix evenly;

[0039] d, 8 MPa powder extrusion molding machine to obtain lightweight aggregate ceramsite blank;

[0040] e. Preheat at 350°C for 20 minutes. The purpose of preheating is mainly to reduce the content of organic matter in the billet and avoid cracking of the billet during sintering; sinter at 1100°C for 30 minutes;

[0041] f, the product is obtained after natural cooling.

Embodiment 3

[0043] In this embodiment, the amount of fly ash added accounts for 20% of the dry sludge mass, and the sintering temperature is 1090°C. The preparation method steps are as follows:

[0044] a. Firstly, heat-dry the dewatered sludge, and use a paddle dryer to dry at 180°C for 2 hours to obtain dry sludge with a moisture content of <10%;

[0045] b. The universal pulverizer crushes and sieves through a 45mm sieve;

[0046] c. Add fly ash with 20% dry sludge mass according to the raw material ratio of the process, and stir with a cement slurry mixer for 5 minutes to mix evenly;

[0047] d, 8 MPa powder extrusion molding machine to obtain lightweight aggregate ceramsite blank;

[0048] e. Preheat at 350°C for 20 minutes. The purpose of preheating is mainly to reduce the content of organic matter in the blank and avoid cracking of the blank during sintering; sinter at 1090°C for 30 minutes;

[0049] f, the product is obtained after natural cooling.

[0050] Fig. 2 Schematic di...

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Abstract

A method for preparing ceramsite light aggregate by utilizing sludge belongs to solid waste treatment, proposal and resource technical field, which produces dry sludge through thermal drying dehydrated mud cake whose moisture percentage is 75-85%, wherein the dry sludge is broken and sieved through 45 mm screen, 18-25% fly ash by mass of the dry sludge is charged to stir, the stirred hybrid material is injected in the powder tablet compressing machine to squeeze and mould under the pressure of 8 Mpa to obtain ceramsite light aggregate blank, the blank is heated to 350 DEG C and is stayed for 20 min in order to lead to volatilize and exhaust completely and is calcined under the temperature of 1080-1100 DEG C for 30 min and is cooled to indoor temperature naturally, and then the ceramsite light aggregate is obtained. The invention for processing living sewage and sludge improves strength of the calcined product, and saves the calcined energy consumption greatly. The obtained ceramsite light aggregate is compact in uranium face, light in weight, high in strength, and satisfies national standard GB/T17431.2-1998, which can be used in the projects such as buildings, roads, bridges and the like.

Description

technical field [0001] The invention relates to a method for preparing ceramsite light aggregate by utilizing sludge, in particular to a resource utilization technology for producing lightweight aggregate ceramsite by drying and sintering municipal dewatered sludge, and belongs to the technical field of solid waste treatment and resource utilization. Background technique [0002] Municipal sludge is rich in organic matter, with a calorific value of more than 3000kcal / kg; its inorganic components are similar to clay, and it is a good natural resource. Today, when energy resources are increasingly tight and the country prohibits the use of clay to make building materials, sludge is used instead of clay to produce lightweight aggregate for building materials. The principles of harmlessness, reduction and recycling of solid waste will have broad development prospects. The use of sludge to make lightweight aggregates for building materials can also solidify heavy metals and remo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C02F11/12
CPCY02P40/60
Inventor 金宜英王兴润聂永丰杜欣
Owner TSINGHUA UNIV
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