Pretreatment process for industrial hazardous wastes with cement kiln

A hazardous waste and co-processing technology, applied in the field of industrial hazardous waste treatment, can solve the problems of high disposal cost, high disposal cost and small disposal scale, and achieve the effect of large disposal capacity, strong adaptability and good environmental benefits

Active Publication Date: 2019-01-22
自贡金龙水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Compared with incineration disposal technology, several other disposal technologies have obvious limitations: (1) It is not the final disposal technology, such as physical disposal technology only changes the material form and separates substances, and other disposal methods are required, generally as pretreatment (2) Too targeted, only for specific wastes, such as chemical treatment, biological treatment and stabilization disposal technology; (3) High disposal cost
Among them, waste incinerators (rotary incinerators, mechanica

Method used

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  • Pretreatment process for industrial hazardous wastes with cement kiln
  • Pretreatment process for industrial hazardous wastes with cement kiln
  • Pretreatment process for industrial hazardous wastes with cement kiln

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] Embodiment 1: when this hazardous industrial waste is semi-solid oil sludge, it comprises the steps:

[0047] (1) Heating: The sludge is first transported to the sludge receiving bin 1 and electrically heated in the sludge receiving bin 1. An electric heating layer is installed on the outside of the sludge receiving bin 1, and the temperature of the inner cavity of the sludge receiving bin is maintained at 62°C. Then, The sludge in the sludge receiving bin 1 is transported to the disc dryer 3 through the screw feeder 2 and heated to 80°C to make the material flowable;

[0048] (2) Separation: The oil sludge heated by the disc dryer 3 is transported to the decanter centrifuge 5 by the plunger pump 4 to separate the mud phase solid and oil phase liquid;

[0049] (3) Grinding and entering the kiln:

[0050] The mud phase solids separated in step (2) are crushed in the colloid mill 6 to the raw meal fineness, specifically, when the mud phase solids are incombustible solids...

Embodiment 2

[0052] Embodiment 2: when this hazardous industrial waste is semi-solid oil sludge, it comprises the following steps:

[0053] (1) Heating: The oil sludge is first transported to the oil sludge receiving bin 1 and electrically heated in the oil sludge receiving bin 1. An electric heating layer is installed on the outside of the oil sludge receiving bin 1. The temperature of the inner cavity of the oil sludge receiving bin 1 is maintained at 65°C, and then , transport the sludge in the sludge receiving bin 1 to the disc dryer 3 through the screw feeder 2 and heat it to 95°C to make the material flowable;

[0054] (2) Separation: The oil sludge heated by the disc dryer 3 is transported to the decanter centrifuge 5 by the plunger pump 4 to separate the mud phase solid and oil phase liquid;

[0055] (3) Grinding and entering the kiln:

[0056] The mud phase solids separated in step (2) are crushed in the colloid mill 6 to the raw meal fineness, specifically, when the mud phase so...

Embodiment 3

[0058] Embodiment 3: when this hazardous industrial waste is semi-solid oil sludge, it comprises the following steps:

[0059] (1) Heating: The sludge is first transported to the sludge receiving bin 1 and electrically heated in the sludge receiving bin 1. There is an electric heating layer on the outside of the sludge receiving bin 1. The temperature of the inner cavity of the sludge receiving bin 1 is maintained at 68°C, and then , the sludge in the sludge receiving bin 1 is transported to the disc dryer 3 through the screw feeder 2 and heated to 100°C to make the material flowable;

[0060] (2) Separation: The oil sludge heated by the disc dryer 3 is transported to the decanter centrifuge 5 by the plunger pump 4 to separate the mud phase solid and oil phase liquid;

[0061] (3) Grinding and entering the kiln:

[0062] The mud phase solids separated in step (2) are crushed in the colloid mill 6 to the raw meal fineness, specifically, when the mud phase solids are incombusti...

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Abstract

The invention provides a pretreatment process for industrial hazardous wastes with a cement kiln. The process comprises the following steps: (A) when the industrial hazardous waste is semi-solid sludge, (1) heating: the sludge enters a disc drying machine and is heated until the material can flow; (2) separation: a mud phase solid and an oil phase liquid are separated by a centrifuge; and (3) grinding into the kiln: the mud phase solid is broken to the raw material fineness and transported to a decomposition furnace; and the oil phase liquid is used as an alternative fuel and then transportedto the cement kiln for calcining cement; and (B) when the industrial hazardous waste is solid: (1) Raymond mill classified grinding: a Raymond mill is used for respectively grinding solid waste with heat value and the solid waste without the heat value; (2) metering; and (3) kiln feeding: the solid waste with the heat value is used as the alternative fuel and transported to the cement kiln for calcining cement; and the solid waste without the heat value is sent to the decomposition furnace as a raw material for cement. The process can save energy and reduce emission, and reduce energy waste.

Description

technical field [0001] The invention relates to a pretreatment process for co-processing industrial hazardous waste in cement kilns, and belongs to the technical field of industrial hazardous waste treatment. Background technique [0002] Waste was first disposed of by landfill, but waste landfill sites have high requirements for site selection, construction and operation, high operating costs, and stabilization treatment must be performed before landfill, otherwise it is easy to cause "secondary pollution" of toxic and harmful substances. secondary pollution". [0003] At present, waste disposal technologies mainly include: physical disposal technology, chemical treatment technology, biochemical disposal technology, stabilization / solidification disposal technology and incineration disposal technology. Compared with incineration disposal technology, several other disposal technologies have obvious limitations: (1) It is not the final disposal technology, such as physical di...

Claims

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Application Information

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IPC IPC(8): B09B3/00B09B5/00
CPCB09B3/00B09B5/00
Inventor 胡斌欧阳卫东
Owner 自贡金龙水泥有限公司
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