Production method and device of calcium cyanamide

Abstract

The invention relates to a production method and device of calcium cyanamide. The method comprises the steps that smashed calcium carbide, catalysts and melted calcium cyanamide are added into corresponding feed bins; the smashed calcium carbide and catalysts are ball-milled to be with required granularity according to the weight proportion and sent into the calcium carbide bin; after the melted calcium cyanamide is ball-milled to be with the granularity ranging from 0.01 mm to 30 mm, the calcium cyanamide is sent to the melted calcium cyanamide bin; the materials in the calcium carbide bin and melted calcium cyanamide bin are sent to a rotary nitriding furnace according to proportions. The device comprises the rotary nitriding furnace, a feeding device installed on the furnace end, a nitrogen input device of a furnace body reaction zone and a cooling device of a furnace body cooling zone, a feed screw conveyor is installed on the furnace end, a heating device is installed on the nitrogen input device of the furnace body reaction zone, and a cooling device is arranged on the furnace body cooling zone. The production method and device of the calcium cyanamide have the advantages that the reaction temperature in the furnace can be adjusted in time, the temperature in the furnace is small in fluctuation, and the discharging and cooling effects are good.

Description

Technical field [0001] The invention relates to a production method and device of calcium cyanamide. Background technique [0002] The current process for producing calcium cyanamide using a rotary nitriding furnace is as follows: send the broken calcium carbide, calcium cyanamide back to the furnace, fluorite or calcium chloride, and sodium chloride as a catalyst to their respective silos, Then send them to the ball mill according to their respective weight proportions and grind them to the required fineness, then send them to the furnace charge bin with an elevator, and spray the prepared charge in the furnace charge bin into the rotary nitriding furnace through nitrogen gas for reaction. [0003] The optimal reaction temperature of the nitriding reaction in the rotary nitriding furnace is 1000-1100°C. If the temperature is too high, side reactions will occur, and if the temperature is too low, the nitriding reaction will be very slow, and the residual free calcium carbid...

AI Technical Summary

Problems solved by technology

The cooling method of the water jacket will generate dead angles in the jacket during the process of water flow in and out. On the one hand, the temperature of the furnace body in the cooling section will be uneven, resulting in deformation of the furnace body in the cooling section and a reduction in service life. The flow rate of water in the water jacket is not uniform, causing the slow cooling water to form a cooling dead angle in the water jacket. When the cooling water in the cooling dead angle is vaporized, the pressure in the water jacket will rise rapidly , the water jacket will be broken, and the inlet and outlet pipes of the cooling water of the nitriding furnace will collapse, and the cooling jacket of the cooling section of the nitriding furnace will be deformed, and the jacket will be broken if the cooling water meets the charge. will cause an explosion

In China, there are examples of manufacturers causing explosion accidents due to jacket water leakage into the furnace. At the same time, due to the large space in the water jacket, it is difficult to deal with the scale in it.

[0010] To sum up, the existing rotary nitriding furnaces have defects in process and structure in the devices that use nitrogen to transport materials into the furnace, the nitrogen input devices in the reaction section, and the cooling devices in the furnace cooling section, which affect the rotary nitriding process. Safe and Efficient Production of Furnace

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