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Method for preparation of ceramsites by using sludge and river sediment and harmlessness treatment and immobilization of heavy metals

A technology for river sediment and heavy metals, applied in chemical instruments and methods, sludge treatment, water/sludge/sewage treatment, etc., can solve problems such as heavy metal solidification, and achieve good compactness, low water absorption, and high strength Effect

Inactive Publication Date: 2012-12-12
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Now a key issue in sludge resource utilization is the solidification of heavy metals. A good treatment process not only requires good practicability, but also requires it to be environmentally friendly and not cause secondary pollution.

Method used

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  • Method for preparation of ceramsites by using sludge and river sediment and harmlessness treatment and immobilization of heavy metals
  • Method for preparation of ceramsites by using sludge and river sediment and harmlessness treatment and immobilization of heavy metals
  • Method for preparation of ceramsites by using sludge and river sediment and harmlessness treatment and immobilization of heavy metals

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specific Embodiment approach 1

[0017] Embodiment 1: In this embodiment, a method of using sludge and river bottom mud to prepare building ceramsite is carried out according to the following steps: the sewage sludge and river bottom mud are naturally dried until the water content drops to 25%~35% after crushing, the crushed sewage sludge and river sediment are mixed according to the mass ratio of 3: (1~8) to obtain a mixture, and then silicate substances are added, and the amount of silicate substances It is 5%~15% of the mass of the mixture, mixed evenly, and then placed in a granulator for extrusion molding to obtain a ceramsite embryo body with a particle size of 6~10mm, dried naturally, and heated at a rate of 8~10 ℃ / min. Then keep it at 1050-1150°C for 20-40 minutes, and cool down with the furnace; the ceramsite for construction is obtained.

[0018] After testing, the loose bulk density of ceramsite samples after firing is 650~800 kg / m 3 , the apparent density is 1500~1800 kg / m 3 , the mud content ra...

specific Embodiment approach 2

[0026] Embodiment 2: This embodiment is different from Embodiment 1 in that: the silicate substance is sodium silicate. Other steps and parameters are the same as in the first embodiment.

specific Embodiment approach 3

[0027] Specific embodiment three: the difference between this embodiment and specific embodiment one or two is: the mass ratio of crushed sewage sludge to river bottom mud is 3: (3~7). Other steps and parameters are the same as those in Embodiment 1 or Embodiment 2.

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Abstract

The invention provides a method for preparation of ceramsites by using sludge and river sediment and harmlessness treatment and immobilization of heavy metals, which relates to a preparation method for constructional ceramsites. The invention aims to overcome the problems in treatment of sewage sludge and contaminated river sediment and immobilization of heavy metals. The method provided by the invention comprises the following steps: respectively crushing sewage sludge and river sediment after natural drying; mixing the crushed sewage sludge and the crushed river sediment according to a mass ratio of 3: 1-8 to obtain a mixture; adding a silicate substance and uniformly mixing the silicate substance with the mixture; placing an obtained product in a granulator for extrusion molding so as to obtain green bodies of the ceramsites; and subjecting the green bodies to natural air drying and sintering so as to obtain the constructional ceramsites. According to the invention, the immobilization rate of heavy metals exceeds 95%; the method of preparing the lightweight ceramsites by utilizing the sludge and the river sediment is simple, industrial production can be realized by using conventional equipment, so the method has a good application prospect.

Description

technical field [0001] The invention relates to a method for preparing ceramsite for construction; in particular, it relates to a method for preparing ceramsite for construction by using sewage sludge and river bottom mud as raw materials. Background technique [0002] At present, with the rapid growth of my country's sewage treatment volume, the amount of sludge produced in the sewage treatment process has also increased rapidly. By the end of 2010, the sludge production had reached nearly 22 million tons. The current status of my country's sewage treatment industry is still heavy on water and light on mud. At present, nearly 80% of the sludge produced by my country's sewage treatment plants has not been properly treated. Since sludge contains a large amount of toxic and harmful substances such as organic matter, germs, and heavy metals, improper treatment can easily pollute the ecological environment and endanger human health. At the same time, sludge contains some useful ...

Claims

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Application Information

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IPC IPC(8): C04B35/00C04B35/622C02F11/00
Inventor 许国仁刘明伟李圭白
Owner HARBIN INST OF TECH
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