Magnesium smelting process with microwave carbon method

Abstract

The invention provides a magnesium smelting process with a microwave carbon method and relates to the technical field of magnesium smelting. The magnesium smelting process comprises the following steps: mixing magnesite which is finely ground to be 120 meshes and semi-coke which is finely ground to be 100 meshes at the ratio of 1 to 0.7 and pressing the mixture to form a magnesium brick, and pre-heating the magnesium brick: carrying out microwave heating to 1100 DEG C under vacuum pressure, and then heating to 1300 DEG C until magnesium steam reduced from the magnesium brick reaches a maximum peak value; when continuing to 23 to 30 minutes, enabling the magnesium brick to be released from the microwave heating so as to enter a microwave delaying effect and a residual heat heating state; continually carrying out a carbon reduction reaction on the magnesium brick under an energy-source-free state and reducing the magnesium steam; under a common effect of vacuum pressure and self pressure of the magnesium steam, crystallizing the magnesium steam, which is reduced from the magnesium brick and has the temperature of 900 to 1000 DEG C, under the condition of 450 to 500 DEG C, so as to obtain high-purity crystallized annular magnesium; when cooling slag of the smelted magnesium brick to 20 DEG C, discharging the slag; then carrying out the next period of magnesium smelting process with the microwave carbon method. The magnesium smelting process is used for smelting magnesium and is a novel magnesium smelting technology with a microwave energy source carbon method.

Description

technical field [0001] The invention discloses a microwave carbon method magnesium smelting process, which relates to the technical field of metallurgy; in particular, it relates to the technical field of the microwave carbon method magnesium smelting process. Background technique [0002] Magnesium compounds were discovered by humans in 1755, and metal magnesium was first discovered by humans in 1774. It was named after the ancient Greek city Magnesia, and the element symbol is Mg. It was confirmed to be useful in 1808, and it was first used in industry in Germany in 1886, and now it has a history of 129 years. Among practical metal materials, magnesium and its alloys have low density and are known as ultra-light materials in the 21st century. Adding ceramic reinforcements to magnesium can significantly improve the elastic modulus, strength, wear resistance and high temperature resistance. Compared with other metals, magnesium has lower density, higher specific stiffness a...

AI Technical Summary

Problems solved by technology

However, the deficiencies, defects and drawbacks of the known Pidgeon method are: high energy consumption, serious environmental pollution, short equipment life and high cost, small production capacity, low purity and high cost

Specifically: 1. High energy consumption: Heat sources other than the Pidgeon method are basically the heat generated by liquid fuel, gas fuel or solid fuel, and the vast majority of them use solid fuel coal as fuel. One ton of magnesium metal needs about 10t of high-quality coal. If calculated according to the coal consumption of 2.5kWh / kg coal power generation, this 10t of high-quality coal is equivalent to 25,000kWh. It can be seen that using coal as fuel has a very low thermal efficiency. Using solid coal (including liquid and gas fuel) as the fuel is low in thermal efficiency because most of the heat generated by fuel combustion is taken away by the flue gas

②. Serious environmental pollution: Pidgeon method uses solid, liquid and gaseous fuels to smelt magnesium and discharges too much combustion gas, causing great environmental pollution

③, equipment life is short and cost is high: the Pidgeon method uses external heating, the vacuum degree in the equipment tube is high, the damage to the high temperature steel alloy is very serious, and the service life of the equipment is short; at the same time, the consumption of the equipment accounts for a large 1 ton of magnesium metal costs 1500-2000 yuan equivalent to equipment, so the cost is high

④, small production capacity, low purity and high cost: Pidgeon method is heated outside the furnace, limited by heat transfer and furnace body (internal vacuum deforms under high temperature conditions), the diameter of the reaction furnace body is limited, so the output of a single furnace It is also limited. In order to reach a certain production scale, more reaction furnaces have to be manufactured, which greatly increases the manufacturing cost and investment of the furnace body and auxiliary equipment. The labor intensity of this situation is high, and it is impossible to realize large-scale industrial production and automation At the same time, due to high coal consumption, high consumption of reducing agent, large consumption of tank materials, etc., the cost is high, resulting in almost no profit for my country's magnesium smelters

However, it is worth noting that at present, there is no large-scale smelting equipment and control technology for systematic research on microwave calcination and the formation of a theoretical system.

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