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Molybdenite concentrate suspended-state roasting process and equipment

A roasting process and suspension roasting furnace technology, applied in the direction of improving process efficiency, can solve problems such as unfavorable development of molybdenum industry, poor roasting quality, flue gas pollution, etc., and achieve fast chemical reaction rate, short roasting time, and prolong life. Effect

Active Publication Date: 2011-07-20
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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Problems solved by technology

[0007] my country's existing molybdenite roasting industry has backward technology, low thermal efficiency, high energy consumption, poor roasting quality, and serious smoke pollution, which is not conducive to the healthy development of my country's molybdenum industry. Suspension roasting technology can well solve this series of problems. The problem, the application space is very large

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  • Molybdenite concentrate suspended-state roasting process and equipment
  • Molybdenite concentrate suspended-state roasting process and equipment

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Embodiment Construction

[0030] The present invention will be described in further detail below in conjunction with the accompanying drawings and embodiments.

[0031] The molybdenite concentrate roasting process in suspension state comprises the following steps:

[0032] In the first step, the molybdenum fine powder is sent to the suspension roasting furnace system by compressed air through the air feeding and spraying device 2, and the heat exchange is completed in the heat exchange area, with 800kg of feed per hour, the temperature in the heat exchange area is 600°C, and the residence time is 7s ;

[0033] In the second step, after heat exchange, an oxidative desulfurization reaction occurs in the reaction zone of the suspension roaster system to generate high-sulfur calcine. The temperature in the reaction zone is 720°C, the wind speed is 15m / s, and the most probable residence time is 2 to 15s, including Sulfur content reduced from 35% to 10%;

[0034] The third step is to set the temperature of...

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Abstract

The invention discloses a molybdenite concentrate suspended-state roasting process, which comprises the following steps of: firstly, conveying molybdenum concentrate to a suspension roaster by using a gas-moving material spraying device through compressed air, and completing heat exchange in a heat exchange area, wherein the temperature of the heat exchange area is 500 to 750DEG C and the retention period is 2 to 15 seconds; secondly, performing oxidation desulfurization reaction in a reaction area of the suspension roaster to obtain roasted high-sulfur sand, wherein the temperature of the reaction area is 550 to 780DEG C, the air speed is 4 to 25m / s, and the retention period is 2 to 15 seconds; and finally, removing residual sulfur from the roasted high-sulfur sand in a rotary kiln at the temperature of between 550 and 780DEG C for 5 to 60 minutes to obtain roasted high-dissolubility molybdenum sand. The invention also provides molybdenite concentrate suspended-state roasting equipment, which overcomes various defects of stacked state roasting and fluidized roasting, has high thermal efficiency and good product quality, greatly shortens roasting time, can obtain the high-dissolubility low-sulfur molybdenum oxide, and ensures that SO2 in flue gas has high concentration and is convenient to recycle for making acid.

Description

technical field [0001] The invention belongs to the field of molybdenum concentrate treatment, and relates to a molybdenite concentrate roasting process and equipment in a suspended state. Background technique [0002] Molybdenum is a very important rare metal element, molybdenite (MoS 2 ) is the main occurrence state of molybdenum. At present, the metallurgical extraction of molybdenum mainly adopts roasting-wet leaching method, and the roasting process is to make molybdenum sulfide (MoS 2 ) oxidation desulfurization to obtain molybdenum oxide, in the case of insufficient oxidation reaction, the molybdenum oxide is a mixture of molybdenum dioxide and molybdenum trioxide, the industrial application of this molybdenum oxide mixture is too narrow, and can only be used to produce molybdenum steel Raw material - ferromolybdenum. Molybdenum oxide with a high content of soluble molybdenum oxide (molybdenum trioxide) can be obtained under the condition of sufficient reaction. Th...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/02C22B34/34
CPCY02P10/20
Inventor 徐德龙陈延信赵博胡亚茹李辉
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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