Production method of industrial sodium sulphide and equipment adopted in production method

Abstract

The invention discloses a production method of industrial sodium sulphide and equipment adopted in the production method. The production method has key points that high-temperature flue gas exhausted from the tail of a long converter during production is subjected to primary dust removal, then a part of the high-temperature flue gas is conveyed to the head of the long converter to be sprayed by a sprayer, and the sprayed flue gas forms an air curtain screen blocking the head of the long converter at the head of the long converter, so that cold air and water vapour outside the head of the long converter can not enter the long converter. Compared with the prior art, the production method has the advantages that quality of the industrial sodium sulphide product produced by the long converter and utilization rate of mirabilite can be equivalent to those of a long converter, namely sodium carbonate content in the industrial sodium sulphide product is reduced to be less than 3% and sodium thiosulfate content in the industrial sodium sulphide product is reduced to be less than 2%, and raw material utilization ratio is increased to be more than 85%; and an energy-saving effect is achieved, and development of the industrial sodium sulphide production from small-scale and batch production to large-scale, continuous and labour-saving production can be promoted, so that the production method has great significance on development of the industrial sodium sulphide production of China.

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 China. High utilization rate and low cost, it is still the mainstream equipment for industrial sodium sulfide production in China; in the early 1970s, long converters were put into use in China, 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 will react with the sodium sulfide and carbon dioxide that have been formed in the sodium sulfide calcining converter to form sodium carbonate impurities and sodium polysulfide (2Na2S+ O2+ CO2 Na2CO3+ Na2S2), sodium polysulfide When in contact with oxygen in the air, it will be transformed into sodium thiosulfate and sodium sulfite impurities. Hydrogen will react with mirabilite in the furnace charge and carbon monoxide in the furnace gas to generate sodium carbonate impurities and harmful hydrogen sulfide gases (Na2SO4+H2+3CO Na2 CO3+ H2S+2CO2), after the water vapor enters the converter, it will also combine with the sodium sulfide and carbon dioxide already formed in the converter The reaction produces sodium carbonate impurity and hydrogen sulfide harmful gas (Na2S+CO2+H2ONa2CO3+H2S), excess oxygen and water in converters for continuous production The presence of steam has produced serious side reactions. The generated sodium carbonate is brought into the product to reach more than 8-10%, and the impurity of sodium thiosulfate is also more than 5%, which 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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