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Method for treating arsenical sludge by utilizing rotary cement kiln

A cement rotary kiln and rotary kiln technology, applied in the fields of comprehensive utilization of resources and environmental protection, can solve problems such as long residence time, achieve the effect of improving efficiency and reducing energy consumption

Inactive Publication Date: 2014-12-24
SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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Problems solved by technology

[0007] (2) Long stay time

Method used

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  • Method for treating arsenical sludge by utilizing rotary cement kiln

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Embodiment 1

[0049] A method of utilizing a cement rotary kiln to treat arsenic-containing sludge, such as figure 1 shown, including the following steps:

[0050] The gas is extracted from the grate cooler and the tail of the rotary kiln, and after being treated by the dust collector, the gas is sent to the dryer to dry the arsenic-containing sludge;

[0051] The arsenic-containing sludge transported from the sewage treatment plant is put into the sludge storage, and according to the proportion of 80% (weight) arsenic-containing sludge with a water content of 80% (weight) according to the production of 1 ton of cement clinker mixed with burning, the arsenic-containing sludge The arsenic sludge is evenly sent to the dryer for drying, and the moisture content of the dried sludge after rough control is 25-35% (weight); the gas discharged from the dryer is collected and purified by the dust collector and then discharged from the chimney Discharged into the atmosphere, the obtained dry sludge ...

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Abstract

The invention discloses a method for treating arsenical sludge by utilizing a rotary cement kiln. According to the method, cooling hot air produced during clinker cooling by a grate cooler of dry process cement production equipment and high-temperature kiln tail gas of the rotary kiln are introduced into a dryer to dry wet sludge, and drying tail gas is exhausted from a chimney after dust removal; and the dried sludge with certain water content is fed into the rotary cement kiln and subjected to co-firing with a cement raw material, arsenic in the arsenical sludge and the cement raw material CaO form calcium arsenate in the high-temperature co-firing process, arsenic curing and stabilizing purposes are achieved, and the arsenical sludge is safely and reasonably treated. According to the method, heat produced during cement production can be sufficiently utilized to dry the wet sludge, energy loss is reduced, and the benefit is improved.

Description

technical field [0001] The invention belongs to the technical field of resource comprehensive utilization and environmental protection, and in particular relates to a method for treating arsenic-containing sludge by using a cement rotary kiln. Background technique [0002] With the development of economy and society, the sources of wastes containing heavy metals have become complex and extensive, such as chemical production, production of chemical raw materials and other industries. Hazardous wastes are generally treated by professional incinerators, but the centralized incineration of hazardous wastes will produce incineration ash and dust, which usually contain heavy metals such as cadmium, manganese, lead and chromium, and become secondary hazardous waste things. It needs to be sent to the landfill for landfill treatment. The most important thing for safe landfill is to prevent the leachate of dangerous substances from seeping into the ground after landfill, especially t...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/38
CPCY02P40/10Y02P40/121
Inventor 虢清伟杨博豪许振成卓琼芳易皓
Owner SOUTH CHINA INST OF ENVIRONMENTAL SCI MEP
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