Preparation method of haydite from municipal sludge

A technology for urban sludge and raw materials, which is applied in the production of ceramic products, clay products, and ceramic materials, can solve the problems of single sludge composition and waste of resources, and achieve the expansion of application scope, energy saving, and high cylinder pressure. Effect

Active Publication Date: 2017-09-29
QINGDAO YI ECO ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Chinese Patent Application No. 2011101491242 (Application Date: 2011.06.03) "Method for Disposal and Resource Utilization of Sludge in Urban Sewage Treatment Plants" discloses a method for disposal and resource utilization of sludge in urban sewage treatment plants. Residential domestic sludge in the treatment plant is used as raw material. After the steps of drying, stirring, granulating, sintering, crushing, dust removal, and powder screening, the sludge is fired into ceramsite that can be used by people. Since this method uses a single Municipal sludge is used as raw material, and the sludge composition is relatively simple. The obtained ceramsite has certain limitations in terms of performance and application.
Chinese Patent Application No. 021149380 (application date: 2002.03.07) "A Method of Using Biological Sludge from Sewage Treatment Plant to Burn Clay Ceramsite" discloses a method of using sewage treatment plant biological sludge to burn clay ceramsite , the specific raw material components include clay, dry biological sludge from sewage treatment plants, limestone, and iron powder. This method uses more clay, resulting in a waste of resources

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] The preparation method of ceramsite using urban sludge taken from a sewage treatment plant in Qingdao as raw material is made by the following specific steps:

[0026] (1) Drying: the urban sludge is concentrated, digested, mechanically dewatered and dried, and the moisture content of the raw sludge obtained is about 23%;

[0027] The specific steps of digestion are as follows: put the municipal sludge into the digestion tank, add methanogenic bacteria and acetogenic bacteria in the digestion tank, adjust the pH of the municipal sludge to about 6.5, and anaerobic treatment at about 37℃. Hours; each ton of municipal sludge puts 2 liters of methanogenic inoculants and 2 liters of acetogenic inoculants. In every liter of inoculants, the number of live bacteria is 10 9 -10 12 cfu / g;

[0028] (2) Ingredients: Take each raw material sludge 100, fly ash 15, kaolin 4, steelmaking slag 8, zeolite 12, hematite 4, calcareous shale 12, waste incineration fly ash 15 according to the follow...

Embodiment 2

[0067] The preparation method of ceramsite using urban sludge taken from a sewage treatment plant in Qingdao as raw material is made by the following specific steps:

[0068] (1) Drying: the urban sludge is concentrated, digested, mechanically dewatered, and dried to obtain a raw material sludge with a moisture content of about 22%; the digestion steps are the same as in Example 1;

[0069] (2) Ingredients: take the raw materials according to the following proportions by weight: raw material sludge 80, fly ash 10, kaolin 1, steelmaking slag 5, zeolite 5, hematite 1, calcareous shale 5, garbage Incineration of fly ash 5, Fe 2 O 3 0.5. Waste glass 1, calcium carbonate 0.1, sodium lauryl sulfate 0.1, sodium benzoate 0.1;

[0070] (3) Mix and stir the raw materials in step (2) evenly, and put the stirred materials into the granulator for granulation, with the particle size controlled between 15-20mm;

[0071] (4) Dry the pelletized pellets at 90°C for 2 hours, then preheat at 220°C for 2...

Embodiment 3

[0078] The preparation method of ceramsite using urban sludge taken from a sewage treatment plant in Qingdao as raw material is made by the following specific steps:

[0079] (1) Drying: the urban sludge is concentrated, digested, mechanically dehydrated and dried, and the moisture content of the obtained raw sludge is about 24%; the digestion steps are the same as in Example 1;

[0080] (2) Ingredients: take the raw materials according to the following weight parts: municipal sludge 120, fly ash 20, kaolin 5, steelmaking slag 20, zeolite 15, hematite 5, calcareous shale 15, garbage incineration Fly ash 20, Fe 2 O 3 2. Waste glass 4. Calcium carbonate 2. Sodium lauryl sulfate 2. Sodium benzoate 1.5;

[0081] (3) Take the raw materials in step (2), mix and stir them evenly, put the stirred materials into the granulator for granulation, and control the particle size between 15-20mm;

[0082] (4) Dry the pelletized pellets at 110°C for 1 hour, then preheat at 280°C for 10 minutes, and t...

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Abstract

The invention provides a preparation method of haydite from municipal sludge. The method particularly comprises the following steps: performing drying; preparing the following raw materials: sludge, fly ash, kaolin, steelmaking furnace slag, zeolite, hematite, calcareous shale, refuse incineration fly ash, Fe2O3, waste glass, calcium carbonate, lauryl sodium sulfate and sodium benzoate; uniformly stirring the raw materials, adding the mixture into a granulator, and performing granulation; performing drying and preheating on the granules, quickly transferring the granules into a sintering apparatus, performing low-temperature sintering, performing high-temperature sintering, and crushing the massive sintered product; and screening the crushed material. The method for preparing haydite reduces the generation of the massive sintered product, thereby correspondingly reducing the subsequent crushing work, and saving the energy consumption. The prepared haydite has the advantages of high cylindrical compressive strength and low bulk density, and the quality and properties of the haydite are obviously improved. The method implements conversion and cyclic utilization on the wastes, and thus, is beneficial to environment protection.

Description

Technical field [0001] The invention belongs to the field of ceramsite preparation, and specifically relates to a method for preparing ceramsite using urban sludge as a raw material. Background technique [0002] In recent years, with the rapid development of cities in my country and the increase in population, the amount of urban sludge has increased significantly. The traditional treatment methods for urban sludge are composting, incineration, and reclamation, which contains a large number of harmful microorganisms, heavy metals and their leachates. The pollution caused has attracted people's attention. In recent years, environmental protection laws and regulations have made strict regulations on the treatment of urban sludge. For example, a few years ago, urban sludge can be directly used as agricultural fertilizer. Due to the high content of heavy metals in the sludge, the use of sludge as fertilizer is now prohibited. [0003] Using urban sludge to produce ceramsite is one of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B33/138C04B33/132C04B33/135C04B33/13C04B33/32C04B38/06
CPCC04B33/13C04B33/1305C04B33/1321C04B33/1352C04B33/1355C04B33/138C04B33/32C04B33/323C04B38/009C04B38/0665C04B2235/3208C04B2235/3272C04B2235/3427C04B2235/661C04B2235/77C04B2235/96C04B18/021C04B18/023C04B18/027C04B18/305C04B28/021C04B28/082C04B33/00C04B33/02C04B33/135C04B35/62204C04B35/6262C04B2235/3206C04B2235/3244C04B2235/3463C04B2235/3472C04B2235/3481C04B2235/349C04B2235/36C04B2235/3873C04B2235/5454C04B2235/6567Y02W30/91Y02P40/60C04B14/047C04B14/106C04B14/108C04B14/22C04B14/28C04B14/308C04B18/08C04B18/106C04B18/142C04B24/04C04B24/16C04B40/0268C04B18/103C04B2111/00784
Inventor 林荣亮
Owner QINGDAO YI ECO ENVIRONMENTAL PROTECTION TECH CO LTD
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