Explosion and bubble prevention alkali decocting furnace

Abstract

A explosion and bubble prevention alkali decocting furnace comprises a taper pot bottom, a circular furnace wall, a U-shaped foundation ring, a smoke exhaust pipe, a high-temperature resistant bearing, a stirring rod and a drive rotation mechanism; a periphery at the bottom end of the taper pot bottom is connected with a periphery at the bottom end of the circular furnace wall through the U-shaped foundation ring, the smoke exhaust pipe is arranged at the top end of the taper pot bottom and is communicated with the taper pot bottom, the high-temperature resistant bearing is arranged on the smoke exhaust pipe and is fixed with the stirring rod, and the high-temperature resistant bearing is rotated under the action of the drive rotation mechanism, so as to driven the stirring rod to rotate. Therefore, the arrangement of the taper pot bottom enables deposited sodium hydroxide crystals to slide into the U-shaped foundation ring lower in heated temperature, and a thermal explosion is avoided; under the action of the drive rotation mechanism, the stirring rod can be driven to stir bubbles in high-concentration and high-viscosity sodium hydroxide alkali liquor, the bubble accumulation is destroyed, and bubbling is prevented; and the smoke exhaust pipe is arranged at the upper end of the taper pot bottom to lengthen a heat exchange distance, the smoke exhaust temperature is low, the thermal efficiency is igh, and the explosion and bubble prevention alkali decocting furnace has the characteristics of high safety and high efficiency.

Description

technical field [0001] The invention relates to the lead-antimony non-ferrous smelting industry, in particular to an alkali boiling furnace, more specifically, to an alkali boiling furnace capable of preventing local implosion and bubbles from bubbling during alkali boiling. Background technique [0002] In the lead-antimony non-ferrous smelting industry, when the Harris method is used to refine the crude alloy by the molten sodium hydroxide method, the soda boiling furnace is often used to make a large amount of sodium hydroxide lye concentrated and then boiled into molten lye at 300-400°C for repeated use. [0003] During this process, as the concentration of sodium hydroxide increases, a large number of precipitated sodium hydroxide crystals sink to the bottom of the furnace. Since the bottom of the pot in the alkali boiling furnace is flat or slightly arched, the hydroxide deposited on the bottom of the pot is oxidized. Sodium crystals are too concentrated at the heat s...

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Problems solved by technology

[0003] During this process, as the concentration of sodium hydroxide increases, a large number of precipitated sodium hydroxide crystals sink to the bottom of the furnace. Since the bottom of the pot in the alkali boiling furnace is flat or slightly arched, the hydroxide deposited on the bottom of the pot is oxidized. Sodium crystals are too concentrated at the heat source of the combustion furnace, resulting in uneven heat conduction, forming a local implosion, and the splashed sodium hydroxide lye will cause harm to people or things around

[0004] On the other hand, because the sodium hydroxide lye used contains a lot of impurities, as the concentration of sodium hydroxide increases, its viscosity becomes higher and higher. During the continuous heating process, a large number of bubbles will be generated and the pot will overflow. cause loss

[0005] Moreover, because the soot of the combustion furnace at the bottom of the above-mentioned soda boiling furnace is directly discharged by the combustion furnace, because the temperature when the soot is discharged is as high as 500-600 ° C, a large amount of heat will be taken away, and the thermal efficiency is low

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