A kind of production method of industrial sodium sulfide and the equipment used therefor

Abstract

The present invention discloses a production method for industrial sodium sulfide and the equipment used. The main point is: when the long -temperature smoke emitted by the tail of the furnace is produced by the tail of the furnace, it is transmitted to the furnace head to sprayThe sprayed flue gas forms the air screen barrier at the head of the furnace, so that the cold air and water steam outside the furnace head cannot enter the furnace.Compared with the existing technology, the method of the present invention can enable the quality and lucker utilization indicator of industrial sodium sulfide products produced by long transfer furnaces to be comparable to short transfer furnaces, that is, sodium carbonate in the product drops below 3%, sodium sulfate dropsBy 2%, the raw material utilization rate is more than 85%, and it also has energy -saving effects, which can promote the development of industrial sodium sulfide from small, intermittently to large -scale, continuous, and provincial labor.Significant.

Description

technical field [0001] The invention belongs to the field of industrial sodium sulfide production, in particular to a production method of industrial sodium sulfide and equipment used in the method, particularly a method of utilizing a long converter to produce industrial sodium sulfide and the equipment used in the method. technical background [0002] In the production of industrial sodium sulfide, the main production method is the method of reducing mirabilite (sodium sulfate) with pulverized coal (carbon) at high temperature. The key equipment for the production of industrial sodium sulfide by this method is a high-temperature reaction furnace. [0003] In the past production, the high-temperature reaction furnace of industrial sodium sulfide has used manual turning reverberatory furnace (open hearth furnace), mechanical turning intermittent production converter (ie short converter) and mechanical turning continuous production converter (ie long converter). ) three kinds...

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Problems solved by technology

Open hearth furnaces have been eliminated due to low production efficiency, high labor intensity, and serious environmental pollution; in the mid-1950s, short converters began to be used in my country. High utilization rate and low cost, it is still the mainstream equipment for industrial sodium sulfide production in my country; in the early 1970s, long converters were put into use in my country, although the single furnace has large production capacity, high production efficiency, less labor and low labor intensity , but in order to meet the requirements of continuous feeding and continuous discharging, a heating tank must be placed at the furnace head (discharging end) to leach crude sodium sulfide, and the furnace head cannot be sealed, not only a large amount of cold air is carried during production Oxygen enters the furnace, and when crude sodium sulfide at nearly 1000°C comes out of the furnace and enters the heating tank for leaching, a large amount of water vapor is also sucked into the furnace, and the water vapor enters the reaction furnace at 1000°C and then decomposes into hydrogen And oxygen, at high temperature, oxygen reacts with the sodium sulfide and carbon dioxide that have been generated in the sodium sulfide calcining converter to generate sodium carbonate impurities and sodium polysulfide (2Na 2 S+ o 2 + CO 2 Na 2 CO 3 + Na 2 S 2 ), sodium polysulfide is converted into sodium thiosulfate and sodium sulfite impurities in contact with oxygen in the air, hydrogen reacts with mirabilite in the furnace charge and carbon monoxide in the furnace gas, and also generates sodium carbonate impurities and harmful hydrogen sulfide gases (Na 2 SO 4 +H 2 +3CO Na 2 CO 3 + H 2 S+2CO 2 ), after the water vapor enters the converter, it will also react with the sodium sulfide and carbon dioxide already generated in the converter to generate sodium carbonate impurities and hydrogen sulfide harmful gas (Na 2 S+CO 2 +H 2 o Na 2 CO 3 +H 2 S), the existence of excessive oxygen and water vapor in the continuous production converter has produced serious side reactions, and the generated sodium carbonate is brought into the product by more than 8-10%, and the impurities of sodium thiosulfate are also more than 5%. Not only seriously affects the product quality, but also consumes more raw materials, the utilization rate of Glauber's salt can only reach about 75%, which increases the production cost of the product

[0004] In this regard, the current continuous converter production of industrial sodium sulfide manufacturers have experimented with off-site intermittent hot-melt leaching and chain-plate off-site continuous hot-melt leaching, but due to the method And equipment problems have not been adopted in the industrial sodium sulfide production industry so far, therefore, the continuous production of long converters has not been widely used in the current industrial sodium sulfide production industry

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