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Method and device of treating urban mud by using cement rotary kiln

A technology for cement rotary kiln and municipal sludge, which is applied in the oxidation treatment of sludge, chemical instruments and methods, inorganic chemistry, etc., can solve the problems of reduced mechanical rigidity of conveyor, low thermal reaction effect of reaction cylinder, and inability to form continuous work. , to avoid the loss of heat, increase the stirring effect and overall strength, and improve the reaction speed and effect.

Inactive Publication Date: 2006-11-15
北控东方(北京)环保技术有限公司
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Problems solved by technology

[0004] The purpose of the present invention is to provide a method and a treatment device for utilizing cement rotary kiln to process municipal sludge, so as to solve the high operating cost of the treatment method in the prior art; The mechanical rigidity is greatly reduced and the problem of continuous work cannot be formed

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  • Method and device of treating urban mud by using cement rotary kiln
  • Method and device of treating urban mud by using cement rotary kiln
  • Method and device of treating urban mud by using cement rotary kiln

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specific Embodiment

[0044] Concrete embodiment: the main raw material needed for producing one ton of activated calcium oxide is as follows:

[0045] Limestone 756Kg,

[0046] Clay 220Kg,

[0047] Silica 60Kg,

[0048] Iron oxide 30Kg,

[0049] Gypsum 35Kg,

[0050] Sludge residue 324Kg.

[0051] That is to say, 30% of the limestone is replaced by sludge slag, and after calcining at 1100℃≈1250℃, the finished cement can be produced by using the conventional cement production process, as shown in Figure 2.

[0052] Chemical analysis of the sludge treatment shows that its calcium oxide content is as high as 50%, which can be replaced by calcium oxide in limestone, a common cement raw material. The process of the present invention uses the sludge treatment instead of limestone for batching according to this test result. The chemical compositions of the raw materials used in the experiment are listed in Table 1.

[0053] In order to simulate the experimental situation as much as possible, this e...

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Abstract

A method for treating city sludge by the rotary kiln of preparing cement features that said sludge containing calcium hydroxide is calcined in said rotary kiln to become calcium oxide. Its apparatus is composed of a sludge pre-treating unit and new material synthesizing unit. The spiral blades of the screw stirring-delivering mechanism have the concave-convex structure on their edge, resulting in high stirring effect and strength.

Description

technical field [0001] The invention relates to a method for treating excess sludge produced after urban sewage treatment and a device used in the method. Background technique [0002] The sludge produced by the urban sewage plant is the residue left after the sewage treatment plant collects and treats the urban sewage and discharges the reclaimed water up to the standard. It is a concentrated substance that exudes a foul smell, contains a variety of volatile gases, contains a variety of pathogenic bacteria and viruses, and is accompanied by various substances from industrial waste, household chemicals, pesticides, heavy metal ions, and toxic chemicals. thing. [0003] The prior art for treating the above-mentioned municipal sludge uses a two-component exothermic agent added to the sludge to evaporate and solidify its liquid components. The heat generating agent uses dehydrated aluminum strong salt and non-aluminum strong salt as acidic components, including 40-120 parts b...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/06C01F7/24C01F11/04
Inventor 陈子庭
Owner 北控东方(北京)环保技术有限公司
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