Rotary kiln fluidized roasting device and roasting process

Abstract

The invention discloses a rotary kiln fluidization roasting device and process. The rotary kiln fluidization roasting device comprises a rotary kiln body, a total air sleeve and an air blower which are sequentially communicated, the total air sleeve is connected to the outer wall of an intermediate temperate section of the rotary kiln body in a sleeving manner, and the air blower is arranged on the exterior of the total air sleeve. An air spraying device is communicated between the rotary kiln body and the total air sleeve and is arranged inside the rotary kiln body. A using method of the rotary kiln fluidization roasting device includes the following steps of burdening, feeding, rotary kiln starting, roasting or burning, smoke collecting, kiln slag collecting, smoke treatment and kiln slag treatment. Compared with the prior art, the air blower blows air to the interior of the rotary kiln body, and therefore the oxygen content of air in the rotary kiln body is increased; meanwhile, materials are stirred, so that the contact areas between the materials and the air are increased, and the ingredients of pulverized coal are reduced; and the rotary kiln fluidization roasting device and process have the beneficial effects of being high in using rate, high in volatilization efficiency of volatile matter, good in refining effect, low in energy consumption and low in smelting cost.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a rotary kiln fluidized roasting device and a roasting process. Background technique [0002] The rotary kiln is a rotary kiln, which is a cylindrical body with a length of 32-50m and a diameter of 1800-3500mm. It has a kiln tail, a kiln body and a kiln head connected in sequence. It is the feeding part of the rotary kiln. Fuels such as coal powder and natural gas are sent into the rotary kiln from the kiln head, and minerals mixed with coal powder and other reducing agents are added to the rotary kiln through the kiln tail. It is a low-temperature section, a medium-temperature section and a high-temperature section. The rotary kiln is installed horizontally on 3-5 sets of supporting wheels for support, and the rotary motion is realized through the transmission of the gear and ring gear, and the inclination angle between the rotary kiln and the ground is 3-5%. The kiln tail i...

AI Technical Summary

Problems solved by technology

In the prior art, non-ferrous metal smelting, chemical industry and other industries have always used this kind of rotary kiln to roast and calcinate minerals. The biggest problem with this traditional rotary kiln is the movement of materials in the kiln. The state is a semi-rolling state, so that the minerals cannot be fully contacted with oxygen, and coke powder or coal powder cannot be fully contacted with oxygen to generate reducing gas CO and fully burn CO, resulting in poor reduction effect of minerals, and cannot Make harmful and volatile metals and non-metals fully contact with oxygen, resulting in low volatilization rate, and when batching, coke powder or coal powder with a weight ratio of 40-45% or even 50% must be added to the material and put in the kiln head Pulverized coal spraying and blast roasting cause energy waste, so this is a technical problem in the non-ferrous metal smelting industry, and it is also a technical problem in other industries using rotary kilns with low heat utilization and high energy consumption

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