Device for smelting magnesium, calcium, strontium and barium

Abstract

The invention provides a device for smelting magnesium, calcium, strontium and barium and belongs to the technical field of metallurgy. The device comprises an inner tank, an outer tank, a heat transfer enhancement device and a water cooling crystallizer. The diameter of the outer tank is greater than that of the inner tank and the inner and outer tanks are of single end-closed structures, and theopening direction of the inner and outer tanks are opposite; the heat transfer enhancement device is arranged in the inner tank at the center axially, the water cooling crystallizer is arranged at one end of the inner and outer tanks and the other end is a welding position. Heat in the device is transferred to a pelletizing feed from the inner and outer tanks simultaneously, so that the heat transfer efficiency is higher. As the inner tank also plays a role of transferring heat, the place with the lowest temperature in the reducing process is transferred from the position of an accessory of acentral tube of a conventional structure to the position between the inner tank and the outer tank, so that the reducing period can be reduced by the device under the condition of a same heating time. On the premise of a same reducing degree, the reduction rate can be increased.

Description

technical field [0001] The invention relates to the technical field of metallurgy, in particular to a device for smelting magnesium, calcium, strontium and barium. Background technique [0002] The smelting process of metal calcium, magnesium, strontium, and barium is to remove the CO from natural carbonate minerals through high-temperature calcination. 2 Obtain the oxides of the above metals (commonly known as calcined white), then crush the calcined white to a certain particle size and then fully mix it with metal powder as a reducing agent (ferrosilicon for magnesium smelting by Pidgeon method, aluminum powder for other metals), and press the ball , Put it into a heat-resistant steel reduction tank, and perform reduction under a vacuum of no more than 10Pa. The reduction temperature varies slightly depending on the type of metal. [0003] The traditional smelting method is to smelt in a reduction tank placed horizontally in the heating furnace (horizontal tank smelting)...

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Problems solved by technology

[0004] However, due to the limitation of the nature of the raw materials in the tank, the thermal conductivity of various calcined whites is very low, and the reduction process needs to be carried out under vacuum, so the heat in the heating furnace outside the tank must be transmitted to the raw materials in the tank. The heat transfer method is heat conduction, and the proportion of convection and radiation is low, especially during the heating process from the addition of cold material to 1,000 degrees (the starting reduction temperature of the above metals is 850-1100 degrees Celsius), due to the thermal conductivity of calcined white is very low, which is the main reason for the long time-consuming and low efficiency of the above-mentioned metallothermic reduction process

[0005] Patent 202576530U proposes a vertical tank with a screw feeder to solve the problem that the pellets are crushed by gravity impact during the feeding process and easily form sticky materials and sticky tanks

[0006] Patent 200610012977.0 proposes a smelting device in order to solve the problems of long feeding time, high labor intensity, difficulty in automatic feeding and unsatisfactory reduction effect of metal magnesium, calcium, and strontium reduction equipment. The basic feature of the reduction tank is that the reduction tank is vertical to prevent the heating furnace , and the bottom of the reduction tank is fixed with a slag discharge pipe extending to the outside of the heating furnace bottom, and the lower part of the slag discharge pipe is provided with a water-cooled sealing cover

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