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Process for preparing sulfur dioxide by roasting troilite in circulating fluidized bed

A circulating fluidized bed and sulfur dioxide technology, applied in chemical instruments and methods, inorganic chemistry, sulfur compounds, etc., can solve problems such as low yield, increased air inhomogeneity, and limited output of a single machine, so as to increase the output of a single machine, good uniformity

Inactive Publication Date: 2006-12-27
铜陵有色金属集团控股有限公司铜冠冶化分公司
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Problems solved by technology

The unit area yield of the bubbling fluidized bed roaster is very low, in order to increase the yield, a larger bed cross-sectional area is required
However, the increase in the cross-sectional area of ​​the bed will increase the inhomogeneity of the air
Therefore, the single machine output of the traditional bubbling fluidized bed roasting pyrite to prepare sulfur dioxide is limited.

Method used

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  • Process for preparing sulfur dioxide by roasting troilite in circulating fluidized bed

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Embodiment Construction

[0015] The process method of the present invention will be further explained below in conjunction with the accompanying drawings.

[0016] figure 1 It is a schematic structural diagram of an embodiment of a circulating fluidized bed device for roasting pyrite to prepare sulfur dioxide provided by the present invention. The device mainly includes a circulating fluidized bed reactor 10, a separation system 1, a feeding system 2, a feeding system 3, a slag discharge system 8, a fan 5, and an air distribution system 9 arranged outside the circulating fluidized bed reactor. Inside the circulating fluidized bed reactor, there is a built-in suspended screen heat balance system 11, and the heat balance system can also use an external bed heat exchanger or a membrane water wall heat exchanger. The separation system generally uses a cyclone separation device.

[0017] Firstly, ferric oxide with an average particle diameter of 40-50 microns is put into the circulating fluidized bed reactor ...

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Abstract

The invention discloses a preparing method of sulfur dioxide to sinter troilite through circulated bed in the chemical raw material preparing technological domain, which is characterized by the following: adopting ferric oxide with 40-50 um even particle diameter as bed material; making inner bed material lie rapid fluidization condition through adjusting fluidization wind quantity; heating bed material at 845-855 deg.c; improving evenness of inner bed temperature and composite gas-solid as well as one-set product; guaranteeing enough reacting time for fine particle separated from circulated fluidization bend reactor; allocating separating system and return system; separating fine particle from gas; sending the separated material to reactor continuously.

Description

Technical field [0001] The invention relates to a process for preparing sulfur dioxide by roasting pyrite, and belongs to the technical field of chemical raw material preparation. Background technique [0002] The traditional roasting process for preparing sulfur dioxide from pyrite uses a bubbling fluidized bed. Put a certain fineness of pyrite into a fluidized bed whose temperature is maintained at around 845°C to 855°C, and pass air into the bed to make the material in the bed a bubbling fluidized state, and at the same time oxidize the pyrite to ferric oxide (Contains a small amount of ferroferric oxide) and sulfur dioxide (contains a small amount of sulfur trioxide). In order to ensure the concentration of sulfur dioxide in the produced gas and the content of iron trioxide in the produced solid materials, the temperature uniformity in the bubbling fluidized bed and the uniformity of gas-solid mixing are very high. However, the characteristics of the bubbling fluidization sta...

Claims

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Application Information

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IPC IPC(8): C01B17/52
Inventor 徐五七左永伟徐光泽姚月亭
Owner 铜陵有色金属集团控股有限公司铜冠冶化分公司
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