A microwave high-temperature roasting reduction method for nickel-containing sludge

A high-temperature roasting and weight reduction technology, which is used in pyrolysis treatment of sludge, dehydration/drying/concentrated sludge treatment, etc., can solve the problem of effective utilization of high-temperature gas without considering the dielectric characteristics of the medium, and achieve the elimination of small leakage, The effect of increasing heating efficiency and improving high-temperature roasting effect

Active Publication Date: 2020-09-04
HEFEI WISDOM DRAGON MACHINERY DESIGN CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, in the above two patents, the change of the dielectric properties of the medium with temperature and the effective use of high-temperature gas in the microwave roasting process are not considered.

Method used

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  • A microwave high-temperature roasting reduction method for nickel-containing sludge
  • A microwave high-temperature roasting reduction method for nickel-containing sludge
  • A microwave high-temperature roasting reduction method for nickel-containing sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] A nickel-containing sludge reduction dual-cavity microwave high-temperature roasting device, such as Figure 1-6 As shown, it includes a microwave heating furnace 1 and a preheating furnace 2, and the nickel-containing sludge reduction dual-cavity microwave high-temperature roasting device includes a microwave heating furnace 1 and a preheating furnace 2, and the microwave heating furnace has two symmetrical A symmetrical microwave generating device 3 is arranged on the side furnace wall, and the microwave generating device heats the nickel-containing sludge in the heating furnace, and a furnace wall 7 adjacent to the microwave generating device on one side is provided with a heating furnace door 4, The door is used to put in and take out the nickel-containing sludge. The inside of the microwave heating furnace is a heating chamber 5, and the furnace wall on one side of the microwave heating furnace is provided with an air inlet 6 through to the inside of the heating cha...

Embodiment 2

[0042] A microwave high-temperature roasting reduction method for nickel-containing sludge comprises the following steps:

[0043] (1) crush the nickel-containing sludge with a moisture content of 8%, and set aside;

[0044] (2) Open the heating furnace door 4 on the wall 7 of the microwave heating furnace 1, and the preheating door 14 on the preheating furnace wall 16 of the preheating furnace 2, and place the broken nickel-containing sludge in the microwave heating furnace respectively. Inside the material bin 8 of the heating chamber 5 of the furnace 1 and the hollow material bin 12 of the preheating chamber 10 of the preheating furnace 2;

[0045] (3) Open the microwave generating device 3 of the microwave heating furnace, adjust the microwave power 1500W, and feed the dry air with a flow rate of 200ml / min into the heating cavity to heat and roast the nickel-containing sludge by the microwave heating furnace inlet 6 simultaneously;

[0046] (4) Heating the nickel-containi...

Embodiment 3

[0052] A microwave high-temperature roasting reduction method for nickel-containing sludge comprises the following steps:

[0053] (1) crush the nickel-containing sludge with a moisture content of 8%, and set aside;

[0054] (2) Open the heating furnace door 4 on the wall 7 of the microwave heating furnace 1, and the preheating door 14 on the preheating furnace wall 16 of the preheating furnace 2, and place the broken nickel-containing sludge in the microwave heating furnace respectively. Inside the material bin 8 of the heating chamber 5 of the furnace 1 and the hollow material bin 12 of the preheating chamber 10 of the preheating furnace 2;

[0055] (3) Open the microwave generating device 3 of the microwave heating furnace, adjust the microwave power 1500W, and feed the dry air with a flow rate of 50ml / min into the heating cavity to heat and roast the nickel-containing sludge by the microwave heating furnace inlet 6 simultaneously;

[0056] (4) Heating the nickel-containin...

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Abstract

The invention relates to a microwave high-temperature roasting reduction method for nickel-containing sludge, which mainly uses a double-cavity microwave high-temperature roasting method to fully utilize the waste heat of high-temperature roasting, so that the heated nickel-containing sludge can be dehydrated again before entering the microwave field , and at the same time achieve the best microwave absorption state, effectively avoid the slow temperature rise phenomenon caused by poor material absorption characteristics in the low temperature stage, increase the heating efficiency, and can effectively eliminate the disadvantages of a small amount of microwave radiation leaking from the gas outlet in traditional equipment. In the present invention, dry air is introduced during the heating and roasting process, so as to fully preheat the nickel-containing sludge and improve the high-temperature roasting effect of the nickel-containing sludge. The invention utilizes microwave heating technology to enrich valuable metals, and at the same time peels off the coating layer formed by gelled insoluble matter and gangue components in the material, providing conditions for the extraction of valuable metals in waste residues.

Description

technical field [0001] The invention relates to a microwave high-temperature roasting reduction method for nickel-containing sludge, which belongs to the technical field of microwave metallurgy. Background technique [0002] In recent years, with the rapid development of the battery industry, the amount of wastewater containing heavy metals produced by battery companies is increasing. At present, the chemical precipitation method is commonly used to treat the wastewater containing heavy metals in battery enterprises, so that the heavy metal ions in the wastewater are precipitated and transferred to the waste residue, thus forming a multi-component mixed hazardous waste containing Ni, Cd, Fe, Cu, Ca, etc. . These wastes have the characteristics of high moisture content, high thermal stability of heavy metal components and easy migration. If they are not handled properly, they will easily cause secondary pollution. Therefore, the new waste slag disposal technology for heavy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B1/02C22B23/02C22B7/00C02F11/13C02F11/10
CPCC02F11/10C02F11/12C22B1/02C22B7/001C22B23/02
Inventor 郭战永李发闯杨通胜张宁翟德梅苏光程芳
Owner HEFEI WISDOM DRAGON MACHINERY DESIGN CO LTD
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