Electric melting furnace, electric melting method and method for producing rock wool by using electric smelting red mud

Abstract

The invention provides an electric melting furnace, an electric melting method and a method for producing rock wool by using electric smelting red mud, and relates to the field of high-temperature melting. An electric melting furnace body is in structure matching with an ignition device, and electric discharging points of graphite electrodes of the ignition device are respectively and electricallyconnected with resistance wires; an electrode automatic adjusting mechanism comprises an electrode lifting mechanism, the electrode lifting mechanism is electrically connected with the three-phase graphite electrodes, and the electrode lifting mechanism drives the three-phase graphite electrode to ascend and descend; and the electric melting furnace body is provided with channels for moving the graphite electrodes. According to the technical scheme, the contact area between the three-phase graphite electrodes and a molten liquid can be adjusted, and the voltage can be converted under an on-load condition, so that electric arc heat is concentrated, the electric arc is stable, and the phenomena of large fluctuation of voltage and current, unstable arc burning, short circuit and arc breakingare avoided. Impact on the power grid in an implementation process is avoided, and no harmonic pollution is caused.

Description

technical field [0001] The invention belongs to the field of high-temperature melting, and in particular relates to an electric melting furnace, an electric melting method and a method for producing rock wool by electric melting red mud. Background technique [0002] At present, there are two types of representative melting furnaces on the market: the first type is a fuel-burning melting furnace, and the second type is an electric melting furnace. The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., and its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated. The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs. The electric melting furnace is widely used because of its advantages of less pollution and high d...

AI Technical Summary

Problems solved by technology

The first kind of fuel combustion melting furnace is divided into surface combustion melting furnace, cyclone melting furnace, etc., its disadvantage is that it produces a large amount of smoke and the tail gas treatment is complicated

The second type of electric melting furnace is divided into resistance furnace, electric arc furnace, plasma furnace, etc. The disadvantages are large power consumption and high maintenance costs.

[0004] However, there are the following problems in the arcing and ignition method of the electric melting furnace at the beginning of operation: first, the three-phase electrodes are inconsistent in arcing inside the electric melting furnace, resulting in an unbalanced three-phase current, and it is an instantaneous irregular three-phase current imbalance , which will cause malfunction of electrical equipment; second, the three-phase electrodes have intermittent arcing inside the electric melting furnace, sometimes short-circuited, sometimes arc-broken, the arc combustion is unstable, and the voltage and current fluctuate greatly, which requires repeated points The arc will cause a great impact on the power grid, and may generate high-order harmonics that will pollute the power grid and affect the safe operation of the power grid

[0006] However, there are the following problems in the process of producing rock wool using red mud as the main material in the cupola in the prior art: First, due to the high alkalinity of red mud, the corrosion resistance of the inner layer of the traditional cupola is not enough and cannot reach The production design cycle is high, and the cost of production and maintenance is high. Second, due to the high iron content in the red mud, the cupola used for the production of rock wool has no special taphole, and iron cannot be recycled. The slag outlet of the traditional rock wool cupola is located in the cupola The bottom can only be used to release iron slag, which causes waste and produces secondary tailings; third, cotton cannot be produced when iron slag is produced, and iron slag cannot be produced when cotton is produced, which requires frequent shutdowns, which seriously affects the output of rock wool products Fourth, the waste gas and dust generated in the production process of the cupola need further treatment to meet the emission standards, which increases the production cost; fifth, according to the national environmental protection requirements, it is strictly forbidden to use coke as heat in the cupola in the rock wool melting section , the use of natural gas as heat energy is also limited; Sixth, the thermal efficiency of traditional cupolas for rock wool production is low, and the thermal energy utilization rate is about 40-50%.

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