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Method of preparing water treatment lightweight ceramisites by using lake sediment and waste additive

A light-weight ceramsite and water treatment technology, which is applied in the field of filter materials, can solve the problems of secondary pollution of dredged lake sediments, etc., and achieve the effects of facilitating microbial attachment, growth and film formation, reducing raw material costs, and broad prospects for industrialization

Inactive Publication Date: 2014-09-24
CHINESE RES ACAD OF ENVIRONMENTAL SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The present invention aims to solve the problem of secondary pollution caused by dredging lake bottom mud, and proposes a method for preparing expanded lightweight ceramsite filler for water treatment with lake bottom mud as raw material and steel slag and straw waste as additives

Method used

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  • Method of preparing water treatment lightweight ceramisites by using lake sediment and waste additive
  • Method of preparing water treatment lightweight ceramisites by using lake sediment and waste additive
  • Method of preparing water treatment lightweight ceramisites by using lake sediment and waste additive

Examples

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example 1

[0032] Example 1: Place the lake sediment in an oven at 105°C to dry it so that the water content is below 20%, crush and grind it to below 100 mesh, add water and stir, the amount of water accounts for about 22% of the sediment, and after mixing It is formed in a granule extruder, and then rolled in a disc to form raw meal balls of a certain size, with a particle size of 6-8mm. Dry the prepared raw pellets at 105°C for 1-2 hours, and set aside; keep the dried pellets in a muffle furnace at a temperature of 1120-1125°C for 10 minutes, take them out, and cool them down to room temperature to obtain expanded light weight pellets. Water treatment ceramsite filter material. The apparent density of the obtained ceramsite filter material is 780kg / m 3 , Bulk density 453kg / m 3 .

[0033] Strength is an important indicator of the performance of ceramsite. In the experimental process of the present invention, a self-designed magnetic stirring test method is adopted to simulate the c...

example 2

[0036] Example 2: The difference between this embodiment and Example 1 is that the temperature of the muffle furnace is set to 1100°C, other steps and parameters are the same as Example 1, and the apparent density of ceramsite is 920kg / m 3 , bulk density 491kg / m 3 , The mass wear rate is 1.51%.

example 3

[0037] Example 3: The difference between this embodiment and Example 1 is that the temperature of the muffle furnace is set to 1150°C, other steps and parameters are the same as Example 1, and the apparent density of ceramsite is 680kg / m 3 , bulk density 425kg / m 3 , The mass wear rate is 1.39%.

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Abstract

The invention provides a method of preparing water treatment lightweight ceramisites by using lake sediment and a waste additive. The method comprises the following steps: 1) drying the lake sediment till the water content is below 20% and preparing the lake sediment into powder of below 100 meshes; preparing dried steel slags into powder of below 80 meshes; and drying straws and preparing the straws into powder of below 60 meshes; 2) uniformly mixing the pre-treated lake sediment, steel slags and straws, adding water to stir, and uniformly mixing to form raw meal nodules with grain size being 6-8mm, wherein the use level of water is 20-25wt% of weight of the uniformly mixed material; and in the raw meal nodules, the content of the lake sediment based on dry weight is 80-100%; 3) drying the prepared raw meal nodules; and 4) preserving the heat for the dried raw meal nodules in a muffle furnace at 1080-1150 DEG C and taking out, and cooling to obtain an expanded lightweight water treatment ceramisite filter material. The invention further provides lightweight ceramisites prepared by the method.

Description

technical field [0001] The invention belongs to the field of filter materials, and relates to a method for preparing lightweight expanded ceramsite from lake bottom mud and steel slag waste, in particular to a water treatment lightweight ceramsite filter material produced by using lake bottom mud as the main raw material and steel slag and straw as additives. Preparation. Background technique [0002] With the continuous development of society and the acceleration of industrialization, a large number of pollutants enter the water body through industrial wastewater, domestic sewage, livestock breeding wastewater, and atmospheric precipitation, and are transferred to the lake sediment through adsorption, enrichment, and deposition. , so that most of the lakes and major rivers in our country are polluted to varying degrees, and the reasonable disposal of the polluted sediment has been highly valued. Environmental dredging has become a common way to deal with contaminated sedim...

Claims

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Application Information

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IPC IPC(8): C04B33/132B01D39/06
CPCY02P40/60
Inventor 李春华章丹叶春张大磊
Owner CHINESE RES ACAD OF ENVIRONMENTAL SCI