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A method for harmless disposal and resource utilization of hot-dip galvanizing line alkaline washing sludge

A hot-dip galvanizing and recycling technology, applied in cement production, optics, photography, etc., can solve problems such as waste of resources, reduce processing costs, improve processing effects, and promote environmental protection

Active Publication Date: 2021-06-22
ANHUI UNIVERSITY OF TECHNOLOGY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome the problem that the alkali cleaning sludge in the existing hot-dip galvanizing industry is usually directly stacked or reclamation treatment, thereby causing a large waste of resources, and provides a harmless disposal of the alkaline cleaning sludge in the hot-dip galvanizing line and resource utilization methods

Method used

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  • A method for harmless disposal and resource utilization of hot-dip galvanizing line alkaline washing sludge

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The main components of the hot-dip galvanizing line alkali-cleaning sludge in this embodiment after being roasted for 2 hours at 400 ° C in a non-oxidizing environment in a muffle furnace are: Fe 2 o 3 The content is 35.58% (the iron in the alkali washing sludge mainly exists in the form of ultrafine iron, which is converted into iron oxide scale after roasting), Al 2 o 3 Content is 19.49%, SiO 2 The CaO content is 17.81%, the CaO content is 12.52%, the ZnO content is 6.95%, and the MgO content is 2.26%. Such as figure 1 As shown, the method for harmless disposal and resource utilization of hot-dip galvanizing line alkaline cleaning sludge in this embodiment includes the following steps:

[0044] Step 1. Selective reduction of alkali washing sludge

[0045] With CO gas, H 2 One or more of the gases and CO 2 The mixed gas of the gas is used as a reducing agent to carry out selective reduction treatment on the alkaline washing sludge of the hot-dip galvanizing line...

Embodiment 2

[0055] The method for harmless disposal and resource utilization of hot-dip galvanizing line alkaline washing sludge in this embodiment includes the following steps:

[0056] Step 1. Selective reduction of alkali washing sludge

[0057] With CO gas, H 2 One or more of the gases and CO 2 The mixed gas of the gas is used as a reducing agent to carry out selective reduction treatment on the alkali washing sludge of the hot-dip galvanizing line. The reduction temperature is 1100 ° C, and the reduction time is 0.5 h. Iron non-volatile matter; the addition M of the reducing agent 还原剂 Calculate according to the following formula:

[0058] m 还原剂 =0.04~0.53M Fe2O3 +0.02~0.34M ZnO -0.11~0.45M 有机物

[0059] Among them: M 还原剂 — mass of reducing agent; M Fe2O3 —Fe in alkali washing sludge of hot-dip galvanizing line 2 o 3 quality; M ZnO — the quality of ZnO in the alkaline washing sludge of the hot-dip galvanizing line; M 有机物 —The quality of organic matter in alkaline washing ...

Embodiment 3

[0067] The method for harmless disposal and resource utilization of hot-dip galvanizing line alkaline washing sludge in this embodiment includes the following steps:

[0068] Step 1. Selective reduction of alkali washing sludge

[0069] With CO gas, H 2 One or more of the gases and CO 2 The mixed gas of the gas is used as a reducing agent to carry out selective reduction treatment on the alkaline washing sludge of the hot-dip galvanizing line. The reduction temperature is 900 ° C, and the reduction time is 1.5 h. Iron non-volatile matter; the addition M of the reducing agent 还原剂 Calculate according to the following formula:

[0070] m 还原剂 =0.04~0.53M Fe2O3 +0.02~0.34M ZnO -0.11~0.45M 有机物

[0071] Among them: M 还原剂 — mass of reducing agent; M Fe2O3 —Fe in alkali washing sludge of hot-dip galvanizing line 2 o 3 quality; M ZnO — the quality of ZnO in the alkaline washing sludge of the hot-dip galvanizing line; M 有机物 —The quality of organic matter in alkaline washing...

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Abstract

The invention discloses a method for harmless disposal and resource utilization of galvanizing line alkaline washing sludge, and belongs to the technical field of reutilization of solid waste resources in the hot-dip galvanizing process. The specific steps of the present invention are as follows: the collected hot-dip galvanizing line alkaline washing sludge and reducing agent are mixed according to the calculation, and then selectively reduced at a temperature of 800-1100°C to obtain zinc-rich volatile matter and iron-rich non-volatile matter; Zinc volatile matter is leached in concentrated sulfuric acid, electrolyzed and washed to obtain metallic zinc; iron-rich non-volatile matter is pulverized and magnetically separated to obtain ultra-fine iron and remaining tailings particles; remaining tailings particles are processed into building materials to obtain cement clinker. Adopting the treatment method of the present invention can ensure that the alkali-cleaning sludge of the hot-dip galvanizing line can fully recycle and utilize valuable resources while the harmless disposal of the hot-dip galvanizing line alkali-cleaning sludge does not produce secondary pollution. The organic matter in the product replaces part of the reducing agent, reduces production costs and indirectly promotes environmental protection.

Description

technical field [0001] The invention belongs to the technical field of reutilization of solid waste resources in the hot-dip galvanizing process, and more specifically relates to a method for harmless disposal and resource utilization of alkaline washing sludge on a hot-dip galvanizing line. Background technique [0002] With the country's increasing environmental protection requirements, the disposal requirements of industrial "three wastes" are becoming more and more stringent. However, the disposal of solid waste has encountered great difficulties. Hot-dip galvanizing is an effective metal anti-corrosion method, which is mainly used in metal structure facilities in various industries, and has been developed on a large scale in the past 30 years. Before hot-dip galvanizing of cold-rolled strip steel, since the surface of the strip steel may be covered with dirt such as rolling oil, machine oil, powder and dust, if the surface is not pre-cleaned, these dirt will be convert...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B1/02C22B5/12C22B19/20C22B19/30C25C1/16C21B13/00C04B7/24
CPCC04B7/24C21B13/00C22B1/02C22B5/12C22B7/007C22B19/22C22B19/30C25C1/16Y02P10/134Y02P10/20Y02P40/10
Inventor 吴朝阳孙晓宇先琛付文涛许坤孔辉刘莉眭梦静
Owner ANHUI UNIVERSITY OF TECHNOLOGY
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