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
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[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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