The operation process of brown fused alumina smelting process is mainly divided into three steps: furnace opening, fusion and refining. The following is a detailed introduction to these three steps.
The furnace operation includes pre-furnace preparation, arc start, smoldering furnace, control, etc. When the control operation starts and the operating voltage changes, the furnace start operation ends.
The fusion operation refers to the transfer to the fusion stage after the opening operation. Most fused alumina electric furnace operation time is the fusion operation stage. It is the rated power for normal use, the feed amount is controlled according to the input power, and the charge reacts moderately and completely melts. When all charges are put into the furnace for low-pressure operation, the fusion operation ends.
The refining operation means that the charge is completely added in the late stage of fusion, and it is transferred from the low pressure to the refining operation. The main task of the refining stage is to adjust the product quality, increase the furnace temperature, convert the charge into products as much as possible, and complete the refining operation until shutdown.
Fused alumina is carried out in a short furnace reduction electric furnace, which provides heat with electrical energy to melt the raw materials and allow the reduction reaction to proceed.
The reduction reaction in the fusion process takes place after the alumina has melted, and the reducing agent is solid carbon. The carbon monoxide gas produced by the reaction burns at the furnace mouth and escapes.
After the bauxite is melted and reduced, it becomes fused alumina and melts. After the fusion is completed, it cools down to form a fused alumina frit.
Fusion fused alumina frit
The fusion process of bauxite in electric furnaces is carried out to a large extent. It is part of fusion, part of reaction, and part of it. This is also the granulation process of taking fused alumina abrasive intermittently in the fusion process, which is to crush qualified fused alumina blocks into granules, and divide them into various sizes according to a certain size range, and separate the iron in the abrasive to meet various grinding Different requirements of the tools require grinding requirements.
At present, the ordinary abrasive processing equipment mainly uses mineral processing and crushing equipment. Compared with the crushing of other raw materials or ores, the processing of abrasives has the following characteristics:
- Ordinary ores or materials are usually more easily broken. Generally, the compressive strength rarely exceeds 10000Pa, but the compressive strength of fused alumina abrasive is as high as 73000Pa or higher, which is a hard material that is difficult to break.
- In terms of finished size. The requirements of the concentrator are not very strict, usually only need to be less than a certain particle size, but abrasive processing has strict requirements on the particle size of the final product. The abrasive standard specifies a size range of 0.5. –5.6mm abrasive is divided into 4#240##27 particle size number; 0.5-635μm fine powder abrasive is divided into 14 numbers. Each particle size abrasive has strict particle size composition requirements.
- More angular shapes are needed for abrasive particles. According to different purposes, the abrasive particles need to be formed into the same type or needle shape. However, other materials are not processed.
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