Brown corundum Production process
1) Preparation before opening the furnace: (1) Connect the electrode: blow the contact surface and tighten the thread. (2) Adjust the length of the electrode: the electrode is in contact with the arc coke, which does not affect the entry and exit or dumping of the furnace body. (3) Measure the distance between the electrode and the distance between the electrode and the furnace wall. (4) Measure secondary conductive system insulation: the resistance value of the insulation part > 0.5MΩ. (5) Check the furnace body transmission, electrode lifting, feeding and other system equipment, water, gas pipes, valves, etc.
2) Open furnace: (1) Place the arc coke: the starting coke particle size is 30~50mm. There are three placement methods: solid triangle: the amount of starting arc coke is large, it is not easy to break the arc, and it is used in the middle. Hollow triangle: the amount of arc starting coke is small, easy to break the arc, not commonly used. Crystal shape: small amount of arc starting coke, fast arc starting, easy to break arc, for furnace opening. (2) Power transmission: (3) arc starting: using higher voltage, when the current rises to 20~30%, increase the block of bauxite pressure arc, when the current load rises to 80%, it can be added to enter the smelting.
3) Smelting: mainly divided into two processes: the stewing furnace method and the open furnace method (see point 3 brown corundum smelting process method and characteristics) for “control” operation and furnace condition analysis.
4) Control: generally stop feeding, control the electrode rise, and small reactions are not processed. The resulting reaction block or “snort” post-processing. In case of levitation.
5) Refining: (1) Before transferring to refining, adjust the ingredient ratio and appropriately increase the amount of carbon. (2) Stop feeding, thin material layer, low voltage, high current operation.
6) Pour (out) furnace: (1) Start the electrode first, and then stop the electrode when the current is not less than 5000A. (2) The dumping furnace prepares the package 0.5h in advance and turns off the cooling water. (3) When pouring, follow the principle of first slow and then fast, and finally slightly slower. (4) Leave a little melt liquid to facilitate the next arc start. (5) Pay attention to the pouring angle to prevent the furnace nozzle from touching the crimping package. (6) After the resetting is reversed, when the electrode is 200~500mm away from the molten liquid, start to send electricity.
7) Precautions: (1) Smelting process, no abnormal phenomenon, send full load as required, and reduce the number of electrode activities. (2) The furnace is not unloaded for a long time, and the movable electrode can be forcibly unloaded for 30~40min. (3) After the electric furnace is destroyed by the large reaction equipment, or the power outage time is long, pay attention to the active electrode. (4) The electrode is glued and should be raised first. (5) Concentrate on running at full load according to the process.
