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Method for treating hazardous wastes

A technology of hazardous waste and flue gas treatment system, applied in the field of industrial waste treatment, can solve the problems of large floor space and complex hazardous waste treatment process, and achieve the effects of small floor space, improved recovery rate and simple process flow

Inactive Publication Date: 2019-03-01
CHINA ENFI ENGINEERING CORPORATION
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Problems solved by technology

[0005] The present invention aims to provide a method for treating hazardous waste to solve the technical problems of complicated hazardous waste treatment process and large occupied area in the prior art

Method used

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  • Method for treating hazardous wastes

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Embodiment 1

[0044] 1. The process scheme is as follows (see figure 1 ):

[0045] Solid hazardous waste materials containing heavy metal sludge, soot, residue, spent catalysts (referred to as solid hazardous waste containing metal), after batching, enter the disc granulator for granulation (or mixing machine for mixing), and the prepared granules (or mixed materials) and waste activated carbon are mixed in proportion and then sent to the rotary kiln. The rotary kiln uses granular coal as auxiliary fuel, and the granular coal is sprayed into the rotary kiln by a spray gun. The free water and crystal water are removed from the material in the rotary kiln, and calcined and decomposed. The calcined material at 800°C is discharged from the kiln head, and then transported to the side-blown submerged combustion bath melting furnace by means of hot charging and hot delivery.

[0046] A weakly reducing atmosphere is maintained in the rotary kiln, and the flue gas is fully burned in the secondary ...

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Abstract

The invention discloses a method for treating hazardous wastes. The method comprises the following steps of: sending hazardous wastes and active carbon into a rotary kiln for roasting, discharging theroasted materials produced by the rotary kiln, sending the roasted materials to a side-blowing submerged combustion molten pool smelting furnace for smelting in a hot charging and hot delivering mode, sending the flue gas of the rotary kiln into a first flue gas treatment system, adding limestone and hematite into a side-blowing submerged combustion molten pool smelting furnace to adjust the slagtype, adopting natural gas as fuel, carrying out submerged molten pool smelting in an oxygen-rich side-blowing mode, crushing the slag produced by molten pool smelting by water to obtain glass-stateharmless slag, and sending the flue gas of the side-blowing submerged combustion molten pool smelting furnace into a second flue gas treatment system. The method for treating hazardous wastes has theadvantages of simple process flow, easy realization of high-level automation, relatively small occupied area, capability of realizing that the recovery rate of valuable metals in solid hazardous wastes containing heavy metal sludge, smoke dust, residues, waste catalysts and the like reaches more than 98 percent, which achieves the comprehensive utilization of resources and energy and the purposesof energy conservation and environmental protection.

Description

technical field [0001] The invention relates to the technical field of industrial waste treatment, in particular to a method for treating hazardous waste. Background technique [0002] With the acceleration of urbanization, the discharge of domestic wastewater and industrial wastewater is increasing, and the output of sludge as a by-product of sewage treatment is also increasing accordingly. Sludge has complex components, extremely high water content and is not easy to dehydrate. It contains many refractory organic pollutants, harmful heavy metals and pathogenic microorganisms, which seriously threaten the survival, health and development of human beings. Practice has proved that the resource utilization of sludge is the inevitable way out of sludge treatment. [0003] Solid hazardous waste mainly comes from sludge, dust and residues produced by surface treatment industry, printed circuit board industry, electroplating industry, glass manufacturing industry, basic chemical ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B1/02B09B3/00B09B5/00
CPCB09B3/00B09B5/00C22B1/02C22B7/001Y02P10/20
Inventor 宋珍珍黎敏徐小锋崔沐陈学刚邬传谷李冲
Owner CHINA ENFI ENGINEERING CORPORATION
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