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Dust cleaning device and dust cleaning method

A technology for cleaning equipment and dust, which is applied to chemical instruments and methods, transportation and packaging, and the removal of solid waste, etc. It can solve the problems of undisclosed, increased amount of cleaning waste liquid, increased number of processes, etc.

Active Publication Date: 2017-05-10
NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] Dust containing more than 2% fluorine, if there is no efficient cleaning device and cleaning method, there will be long-term cleaning and multiple cleanings, the amount of cleaning waste liquid will increase, the number of steps will also increase, and the cost of treatment will become very high For such a problem, until now, no technology related to a cleaning device and a cleaning method for efficiently performing such dust leaching treatment has been disclosed.

Method used

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  • Dust cleaning device and dust cleaning method
  • Dust cleaning device and dust cleaning method
  • Dust cleaning device and dust cleaning method

Examples

Experimental program
Comparison scheme
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Embodiment

[0067] Figure 5 An example of the dust cleaning device of the present invention is shown in a schematic diagram.

[0068] In the example of the present invention, it is an example of an apparatus in which all cleaning processes are performed in the same tank. A mixer M, a pH meter pH, and a fluoride ion concentration meter F are installed in the cleaning tank. pH control is performed by adding the NaOH aqueous solution from the NaOH aqueous solution tank via the pump P into the cleaning tank so that the pH of the dust slurry measured by the pH meter pH falls within a predetermined range. In addition, the fluorine concentration control is performed by the fluorine concentration control unit S, and the valve V is opened and closed by the control unit C, and the amount of water added to the cleaning tank is controlled so that the dust slurry measured by the fluoride ion concentration meter The fluoride ion concentration of the material is within the specified range. In additi...

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PUM

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Abstract

The present invention provides a cleaning device and a cleaning method capable of reducing fluorine in dust while suppressing leaching of useful metal components from dust containing fluorine at a high concentration of 2% or more. An agitating cleaning device, which is an agitating cleaning device that mixes dust containing zinc, lead, and cadmium as heavy metal components and containing 2% or more of fluorine with an alkaline cleaning solution, and leaches fluorine from the dust. Cleaning, the stirring cleaning device is equipped with a pH meter and a pH control device, and is also equipped with a fluoride ion concentration meter and a fluoride ion concentration control device. By controlling the fluoride ion concentration within the range of 100-14000 mg / l and the pH within the range of 10-13, the leaching of zinc, lead, and cadmium can be suppressed as much as possible and the fluorine concentration can be reduced.

Description

technical field [0001] The present invention relates to a dust cleaning device and a dust cleaning method used in cleaning treatment of dust required to recycle dust discharged during metal smelting as raw materials for zinc refining. Background technique [0002] Metal reduction furnaces such as rotary hearth furnaces and electric resistance furnaces are used to reduce metal components and reuse the dust, scale, and sludge generated during the production of ordinary steel and stainless steel. [0003] At this time, the dust generated from the metal reduction furnace contains zinc, lead, and cadmium as heavy metal components, and the fluorine is concentrated to more than 2%. Since the refractory material of the furnace body is damaged, it is necessary to remove these halogens, especially fluorine, in order to be able to recycle the dust as a raw material for zinc smelting. [0004] The present invention relates to a cleaning device and a cleaning method used for cleaning an...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00C22B1/00
CPCB09B3/80
Inventor 小野信行中尾隆二久保田宽吉水信义伊豆忠浩
Owner NIPPON STEEL & SUMIKIN STAINLESS STEEL CORP