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Microwave high-temperature roasting and reduction method of nickel-containing sludge

A high-temperature roasting and reduction technology, which is applied in the fields of pyrolysis sludge treatment, dehydration/drying/thickened sludge treatment, etc., can solve the problems of effective utilization of high-temperature gas without considering the dielectric properties of the medium, and achieve the elimination of a small amount of leakage, The effect of increasing heating efficiency and improving the effect of high-temperature roasting

Active Publication Date: 2019-03-26
HEFEI WISDOM DRAGON MACHINERY DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Microwave high-temperature roasting and reduction method of nickel-containing sludge
  • Microwave high-temperature roasting and reduction method of nickel-containing sludge
  • Microwave high-temperature roasting and reduction method of 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 and reduction method of nickel-containing sludge. A double-cavity microwave high-temperature roasting method is mainly adopted, high-temperature roasting waste heat is fully used, and therefore the nickel-containing sludge can be dehydrated before entering a microwave field, the best wave-absorbing state can be achieved, slow heating caused by poor wave-absorbing of materials at the low temperature stage is effectively avoided, heating efficiency is improved, and the defect that a small amount of microwave radiation is released from an air vent of traditional equipment is effectively overcome. Dry air is introduced during the heating roasting process, and therefore the purposes of fully preheating the nickel-containing sludge and improving the nickel-containing sludge high-temperature roasting effect are achieved. The microwave heating technology is adopted to enrich valuable metals, a coating formed by gelatinized insoluble matter and gangue composition in the materials is peeled off, and conditions are provided for extraction of valuable metals from waste residue.

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 Applications(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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