Reduction tank assembly with rotating stirring inner core structure for vertical reduction furnace

Abstract

The invention discloses a reduction tank assembly with a rotary stirring inner core structure for a vertical reduction furnace. The reduction tank assembly comprises a vertical reduction tank body (1), wherein a mounting frame (2) is arranged at the outer upper end of the reduction tank body (1), a driving motor (3) and a speed reducer (4) are mounted on the mounting frame (2), an output shaft ofthe speed reducer (4) serves as a rotating inner shaft (7), the rotating inner shaft (7) is externally sleeved with a rotating outer shaft (6), the rotating outer shaft (6) stretches into the reduction tank body (1) and is connected with a rotating core shaft (5) through a coupler (8). The reduction tank assembly is reasonable to design and is particularly suitable for stirring materials in the reduction process of a metal magnesium vertical tank reduction furnace. The reduction tank assembly is also suitable for the stirring heating of materials in the reduction procedure of other metal vertical tanks, the heating uniformity of the whole materials can be realized according to the heating requirements, and the materials on an inner layer are effectively reduced, so that the reduction yieldis maximized, and meanwhile, the reduction time is greatly shortened.

Description

technical field [0001] The invention belongs to the technical field of vertical reduction furnace equipment for metal magnesium reduction, in particular to a vertical reduction tank assembly with a rotating mandrel that has a rotating stirring function. Background technique [0002] The Pidgeon method for smelting magnesium is to mix the calcined dolomite and a certain amount of ferrosilicon (reductant) into powder and then press it into balls, put the pressed balls in the reduction tank, and pump the inside of the tank to below 13Pa vacuum; the reduction tank is placed in a heating furnace (also known as a reduction furnace) and heated at a temperature of about 1200 ° C, so that the calcined dolomite (MgO+CaO) and ferrosilicon undergo a reduction reaction, thereby displacing magnesium metal and displacing The metal magnesium vapor meets the crystallizer cooled by the circulating water jacket outside the tank and crystallizes to become crude magnesium. [0003] The device t...

AI Technical Summary

Problems solved by technology

[0003] The device to realize the reduction of metal magnesium is the metal magnesium reduction furnace. With the progress of production, the requirements for the operating environment, labor intensity and personnel, etc., the traditional horizontal tank reduction furnace in the past is gradually unable to meet the needs of the new situation. At present, there are Many manufacturers are designing and trialling vertical tank reduction furnaces, and have achieved normal production. However, for the current vertical tank reduction furnaces, there are still disadvantages such as long reduction time and low reduction yield. The reduction time of vertical tank reduction furnaces is generally For 16 hours, the average material-to-magnesium ratio for reduction is about 6.2, which is mainly caused by the poor thermal conductivity of the material and the inability to discharge the reducing gas in time, which affects the vapor pressure in the reduction zone.

[0004] In order to reduce the thickness of the material layer in the reduction tank of the current vertical reduction furnace, an intermediate metal tube is added in the middle of the reduction tank. The addition of the intermediate metal tube makes the thickness of the material layer thinner. At the same time, many small holes are opened in the center tube for the discharge of magnesium vapor. , but due to the poor thermal conductivity of the reduced material, the internal material cannot obtain heat in time, which affects the reduction time; at the same time, the magnesium vapor flows from the outer high temperature area to the middle, and the magnesium vapor will decrease during the flow process, and at the same time, the outer part will be heated first to obtain high temperature. , the magnesium vapor cannot be discharged in time, and there is resistance in the flow process, so it cannot be discharged in time, which increases the magnesium vapor pressure in the reduction zone, and the increase in the vapor pressure in the reduction zone directly affects the continuation of the reduction, thereby affecting the reduction efficiency

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