Method for preparing flower ceramic particles with urban water supply sludge

A technology for water supply sludge and flower ceramsite, which is applied in the environmental field, can solve problems such as affecting the absorption and metabolism of plant nutrients, and achieve the effects of moderate fertilizer retention, reduced energy consumption, and stable chemical properties.

Inactive Publication Date: 2014-04-16
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the use of water supply sludge for garden planting is a promising disposal method, but due to the high aluminum content in water supply sludge, it will affect the absorption and metabolism of plant nutrients, so the application still has certain limitations

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The formula and method of firing flower ceramsite with water supply sludge, the specific method is as follows:

[0018] (1) Add high-efficiency polyaluminium chloride with 10% dry sludge to the water supply sludge and dehydrate to a moisture content of 75%. After drying and grinding other ingredients through a 100-mesh sieve, the water supply sludge, coal slime, burnt gemstone, chestnut The dry weight ratio of shell and waste glass is 30%: 30%: 30%: 5%: 5%, stir evenly, air-dry at room temperature for 2 days, and send it to a granulator to make spherical particles of 10mm.

[0019] (2) After drying the raw material balls at room temperature for 1 day, they were sent into the muffle furnace for continuous heating and roasting to 1000°C. The whole heating process was divided into 4 stages, the heating rate of the first stage was 20°C / min, and The heating rate in the second stage is 5°C / min, the heating rate in the third stage is 10°C / min, and the heating rate in the last ...

Embodiment 2

[0023] The implementation of this example is different from Example 1 in that: the ratio of raw materials in step 2 is according to the feed water sludge, coal slime, burnt gems, chestnut shells and waste glass according to the dry weight ratio of 40%: 20%: 25%: The ratio of 5%: 10% is mixed well, and other steps and parameters are the same as in Example 1.

[0024] The appearance of the finished ceramsite is dark brown spherical solid with rough surface, and the bulk density is 600-650kg / m 3 , the cylinder compressive strength is 6.0MPa, and the water absorption rate is 14.7-19.4%.

Embodiment 3

[0026] The implementation of this example is different from Example 1 in that: in step 2, the proportion of raw materials is according to the feed water sludge, and the dry weight ratio of coal slime, burnt gemstone, chestnut shell and waste glass is 50%: 20%: 20%: 5 %: 5% mixing and mixing, other steps and parameters are the same as in Example 1.

[0027] The appearance of the finished ceramsite is dark brown spherical solid with rough surface, and the bulk density is 520-580kg / m 3 , the cylinder compressive strength is 4.5MPa, and the water absorption rate is 17.5-26.2%.

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Abstract

A method for preparing flower ceramic particles with urban water supply sludge belongs to the field of environmental technology, and relates to the resource utilization of solid waste. Materials accounted by dry weight rate, including 30-50 percent of water supply sludge, 10-30 percent of coal slurry, 20-30 percent of flint clay, 5-7 percent of Chinese chestnut shell, 8-10 percent of waste glass and the like, are dried, grinded, mixed and uniformly agitated to be prepared into spheres 6-15 mm in particle diameter. The spheres are subjected to pre-heating torrefaction and cooling so as to form the high performance flower ceramic particles. The ceramic particles prepared by the method are light and have loose and porous surfaces, can absorb a considerable amount of water, and has proper ability to keep nutritious substances. Compared with soilless substrates such as sand and wood chips, the flow ceramic particles have the characteristics of cleanness, neatness, attractiveness in shape, lightness, no pollution, cleanable performance, durability, higher stability in chemical property and the like.

Description

technical field [0001] The invention relates to a method for burning high-performance flower ceramsite by using urban water supply sludge, which belongs to the field of environmental technology. Background technique [0002] While producing drinking water, urban water supply plants also produce a large amount of sludge. This part of sludge comes from the filtrate and sediment produced in the raw water purification process, accounting for about 4%-7% of the total net water, including concentrated suspended matter and organic matter, and coagulation remaining in the mud agent. Compared with sewage sludge, the number of E. coli in feedwater sludge is very small, and the content of heavy metals is also low, which reduces the environmental threat caused by excessive bacteria and heavy metal pollutants. In the current situation of severe shortage of water resources and increasingly serious water environment pollution, more and more people pay more and more attention to the impor...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/132C04B38/00
CPCY02P40/60
Inventor 李依丽杨珊珊李艳玲尹晶
Owner BEIJING UNIV OF TECH
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