A metal magnesium reduction heating method with internal and external heating

Abstract

A metal magnesium reduction heating method with internal and external heating, the traditional magnesium reduction heating method adopts heat transfer from the outside of the reduction tank to the inside of the tank, the heat transfer rate is low, the heat transfer is slow, the reaction time is as long as 10-12 hours, and the flue gas and Heat dissipation results in a large loss of energy consumption. In the center of the reduction tank, a movable electric heater that can be loaded and unloaded at any time is installed to heat the inside and outside of the reduction tank at the same time. The reduction time is shortened by 5-7 hours. The low temperature area in the center of the reduction tank is changed to a high temperature area. The outer wall of the tank is no longer a high temperature area, which reduces the consumption of the reduction tank. At the same time, due to the overall increase of the temperature in the reduction tank, the reaction speed is accelerated, the magnesium crystal is dense, and the quality is improved. Specific embodiments: 1. Insulating and sealing terminals are installed on the canned reduction can; 2. A detachable active electric heater is installed in the can; 3. The can terminal and the electric heater are connected with a terminal board; 4 , The terminal outside the tank is connected with the power line and the computer control line for network control. Operation method: 1. Fill the reduction tank after cleaning the residue to the horizontal center position; 2. Put on the movable electric heater; 3. Put the material ball on the upper vacancy of the electric heater; 4. Install the crystals in sequence 5. Turn on the electric heater switch when the vacuum reaches 35-60Pa; 6. After the reaction is over, turn off the power of the electric heater, and after operating in the usual order, pull out the electric heater The heater is used to scrape out the reduced slag for the next cycle.

Description

technical field [0001] The invention belongs to the field of metal magnesium production process transformation, and relates to a reduction technology in which an electric heater is installed in the reduction tank and heated at the same time on the basis of external heating in the existing reduction tank during the Pidgeon method magnesium smelting process. Background technique [0002] The traditional Pidgeon method of magnesium smelting reduction tank heating method is that multiple reduction tanks are installed in the reduction furnace, and the reduction furnace burns coal gas, or natural gas, coke oven gas, coal bed methane and other fuels to heat the outer wall of the reduction tank, and the reduction tank is reduced by heat conduction. The reduction mixture in the tank is heated, and a reduction reaction occurs under vacuum conditions to produce coarse magnesium crystals. Due to the poor heat transfer effect of the reduction mixture, the general reaction takes 10-12 hour...

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Problems solved by technology

The reaction time in the patent can be reduced to 1-5 hours, the result is attractive, but this result is obtained from the experimental results of the 10kg mixture in the laboratory. To realize industrial production, it is necessary to experience the amplified microwave penetration ability, the furnace Influenced by many factors such as heat dissipation loss and enlarged operability, there is still a long way to go, and it is difficult to realize industrialization in the near future

[0005] The Burzano method in Italy abroad and the Zhengzhou Light Metal Research Institute in China did not use the reduction method of installing an electric heater inside the reduction material layer in the metal magnesium factory in Minhe Tuzu Village, Qinghai in the last century. Since all the heaters inside the reduction container are used , large heat dissipation loss, low electrothermal conversion efficiency, power consumption is around 25000-40000kwh, and it is difficult to operate normally under the condition of high electricity price

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