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Method for synergetically treating fluorine-containing sludge in cement kiln

A co-processing, cement kiln technology, applied in the field of environmental protection and sludge treatment, can solve the problems of small processing capacity, high processing cost and high energy consumption, and achieve the effects of long residence time, production cost saving and high temperature

Active Publication Date: 2013-01-23
杭州易辉环保科技有限公司
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  • Abstract
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Problems solved by technology

[0004] Among various sludge disposal methods, the high moisture content of sludge is a major problem. In the existing various reduction and resource disposal methods, it is necessary to dehydrate the sludge in advance or special drying treatment For example, the sludge is used for cement batching after the water content is reduced to below 40% through a special dehydration device, which makes the sludge treatment process complicated, high energy consumption, small treatment volume, and high treatment cost

Method used

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  • Method for synergetically treating fluorine-containing sludge in cement kiln

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Embodiment 1

[0034] In the new dry-process cement clinker production line with a daily output of 2,500 tons, the cement raw materials are accurately measured according to the weight ratio of limestone: sand shale: copper slag = 80.0:15.6:4.4, and then are transported by the belt into the raw cement mill, and the waste heat of the cement kiln is used. The tail gas is dried and pretreated with fluorine-containing sludge with a moisture content of 60% by a disc dryer, and the moisture content is ≤30%, and then transported to the limestone conveyor belt by a metering conveyor belt, mixed and homogenized with limestone and added to the cement raw meal mill. Add 1.67 tons of the above-mentioned fluorine-containing sludge per hour (converted to about 1% of the wet fluoride-containing sludge in the cement raw material). Cement raw meal is homogenized and sent to the calcination system to be fired into cement clinker. The ratio of cement clinker is: lime saturation ratio (KH) = 0.920, silicic aci...

Embodiment 2

[0036] In the 2,500-ton new dry-process cement clinker production line, it is accurately measured according to limestone:sand shale:copper slag=80.0:15.6:4.4 (weight ratio), and then it is conveyed by belt into the cement raw material mill, and the waste heat exhaust gas from the cement kiln is used. The disc dryer dries the fluorine-containing sludge with a moisture content of 60% and pre-treats it with a moisture content of ≤30%, and then uses a metering conveyor belt to transport it to the limestone conveyor belt, mix and homogenize it with limestone and add it to the cement raw meal mill. The amount of sludge is 8.33 tons (converted to about 5% of the wet fluorine-containing sludge in the cement raw material). The fluorine-containing sludge is dried in the raw cement mill by using the waste heat of the rotary kiln exhaust gas, and mixed with the cement raw material. Grind together into cement raw meal, after homogenization, send it to the calcination system, and burn it ...

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Abstract

The invention provides a method for synergetically treating fluorine-containing sludge in a cement kiln. According to the method, the fluorine-containing sludge with water content of 40-80% can be synergetically treated in a cement kiln, and the sludge mixing amount accounts for about 1-5% of the total amount of the cement raw material. The method provided by the invention is characterized in that the fluorine-containing sludge with the water content of 40-80% is dried by afterheat tail gas of the cement kiln, so that the fluorine containing sludge can be safely treated in the cement kiln andthe performance indexes of the produced cement reach the national standard. According to the invention, since the fluorine-containing sludge is used as an available resource, the fluorine-containing sludge containing fluorides is safely treated and a great deal of land is saved.

Description

technical field [0001] The invention belongs to the field of sludge treatment in the field of environmental protection, and in particular relates to a method for co-processing fluorine-containing sludge by using a cement kiln in cement production. technical background [0002] Fluorine-containing sludge is the sludge produced by photovoltaic enterprises in the process of processing monocrystalline silicon wafers, cells, modules, power generation systems and other products. Wastewater is mainly disposed of by chemical precipitation / coagulation treatment. Additions such as calcium hydroxide, calcium chloride, calcium sulfate, and calcium carbonate produce insoluble calcium fluoride precipitates to remove fluorine in wastewater. It is said that the fluoride concentration can be treated to about 12-30mg / L. This method is currently the most important way to treat fluorine-containing wastewater in domestic industry, and it is also the main source of fluoride-containing sludge. I...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/24
CPCY02P40/10
Inventor 郑慧
Owner 杭州易辉环保科技有限公司
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