Harmless treatment and resource utilization method for alkaline washing sludge of hot galvanizing line

A hot-dip galvanizing and resource-based technology, applied in cement production, instruments, optics, etc., can solve problems such as waste of resources, achieve the effects of reducing processing costs, reducing consumption, and improving processing effects

Active Publication Date: 2019-11-08
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 reclamati

Method used

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  • Harmless treatment and resource utilization method for alkaline washing sludge of hot galvanizing line

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0042] Example 1

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

[0044] Step 1. Selective reduction of alkaline washed sludge

[0045] With CO gas, H 2 One or more of the gases and CO 2 The mixed gas of gas is used as a reducing agent to selectively reduce the alkali-washed sludge of the hot-dip galvanizing lin...

Example Embodiment

[0054] Example 2

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

[0056] Step 1. Selective reduction of alkaline washed sludge

[0057] With CO gas, H 2 One or more of the gases and CO 2 The gas mixture is used as a reducing agent to selectively reduce the alkaline washing sludge of the hot-dip galvanizing line. The reduction temperature is 1100°C and the reduction time is 0.5h. The volatile smoke and dust during the reduction process are collected to obtain zinc-rich volatiles and rich Iron is not volatile; the addition amount of the reducing agent M reducing agent Calculate according to the following formula:

[0058] M reducing agent =0.04~0.53M Fe2O3 +0.02~0.34M ZnO -0.11~0.45M Organic matter

[0059] Where: M reducing agent —Reducing agent quality; M Fe2O3 —Fe in alkaline washing sludge of hot-dip galvanizing line 2 O 3 The quality; M ZnO —Quality o...

Example Embodiment

[0066] Example 3

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

[0068] Step 1. Selective reduction of alkaline washed sludge

[0069] With CO gas, H 2 One or more of the gases and CO 2 The gas mixture is used as a reducing agent to selectively reduce the alkali-washed sludge of the hot-dip galvanizing line. The reduction temperature is 900°C and the reduction time is 1.5h. The volatile smoke and dust in the reduction process are collected to obtain zinc-rich volatiles and rich Iron is not volatile; the addition amount of the reducing agent M reducing agent Calculate according to the following formula:

[0070] M reducing agent =0.04~0.53M Fe2O3 +0.02~0.34M ZnO -0.11~0.45M Organic matter

[0071] Where: M reducing agent —Reducing agent quality; M Fe2O3 —Fe in alkaline washing sludge of hot-dip galvanizing line 2 O 3 The quality; M ZnO —Quality of ZnO in...

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Abstract

The invention discloses a harmless treatment and resource utilization method for alkaline washing sludge of a galvanizing line, and belongs to the technical field of solid waste resource recycling ina hot galvanizing process. The method specifically comprises the following steps that the collected alkaline washing sludge and the reducing agent of the hot galvanizing line are prepared according tocalculation and then subjected to selective reduction at the temperature condition of 800-1100DEG C to obtain zinc-rich volatile matters and iron-rich non-volatile matters; the zinc-rich volatile matters are leached in concentrated sulfuric acid, electrolyzed, and cleaned to obtain metal zinc; the iron-rich non-volatile matters are crushed and magnetically separated to obtain superfine iron and residual tailings particles; and cement clinker is obtain obtained by carrying out building material treatment on the residual tailings particles. By adopting the treatment method, the harmless treatment of the hot galvanizing line alkaline washing sludge without secondary pollution can be ensured, meanwhile, valuable resources are fully recovered and utilized, in addition, organic matters in the hot galvanizing line alkaline washing sludge are used for replacing part of reducing agents, the production cost is reduced, and the environmental protection is indirectly promoted.

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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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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