Method for preparing industrial sodium carbonate through hydrazine hydrate byproduct sodium carbonate decahydrate by means of multi-effect evaporation technology

Abstract

The invention relates to ADC foaming agent production technology improvement and wastewater recycling, in particular to a method for preparing industrial sodium carbonate through hydrazine hydrate byproduct sodium carbonate decahydrate by means of the multi-effect evaporation technology. The method comprises the steps that firstly, sodium carbonate decahydrate is dissolved into an alkali dissolution tank, after being preheated by a preheater, the sodium carbonate decahydrate enters all effect evaporators in parallel to be heated, evaporated and concentrated, the sodium carbonate decahydrate is evaporated and crystalized to form monohydrate sodium carbonate, the crystalized monohydrate sodium carbonate is deposited at the bottom of the evaporator, enters a centrifugal machine head tank after being thickened through a salt pump and a suspension separator, and is dehydrated through a centrifugal machine to obtain monohydrate sodium carbonate, and the centrifugal mother liquid is returned back to a sodium carbonate decahydrate storage tank; when the salt and hydrazine hydrate contents are high, the centrifugal mother liquid is fed to other processes to be recycled, then, water is separated out when the monohydrate sodium carbonate is heated, and the monohydrate sodium carbonate is converted into sodium carbonate at the temperature of 109 DEG C, and the finished industrial product sodium carbonate is obtained. The method is unique, no carbonization is needed, comprehensive waste residue government is achieved in the hydrazine hydrate production process, and the purpose of environmental protection is achieved.

Description

technical field [0001] The invention relates to the improvement of the production process of ADC foaming agent and the recycling of waste water, in particular to a method for preparing industrial soda ash through the production of sodium carbonate decahydrate by-product of hydrazine hydrate through a multi-effect evaporation process. Background technique [0002] Application number CN201310164695.2, application date May 6, 2013, name is a method for comprehensive utilization of sodium carbonate decahydrate by-product of urea hydrazine hydrate. Raise the temperature and turn it into a certain concentration of sodium carbonate solution, filter and remove impurities, enter the carbonization tower and feed CO 2 Carbonization is carried out to generate sodium bicarbonate, and the sodium bicarbonate generated by the reaction is centrifuged, separated, and dried to obtain baking soda. The technological process is relatively complicated. [0003] There is currently no solution to t...

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Problems solved by technology

[0002] Application number CN201310164695.2, application date May 6, 2013, name is a method for comprehensive utilization of sodium carbonate decahydrate by-product of urea hydrazine hydrate. Raise the temperature and turn it into a certain concentration of sodium carbonate solution, filter and remove impurities, enter the carbonization tower and feed CO 2 Carry out carbonization to generate sodium bicarbonate, centrifuge and separate the sodium bicarbonate generated by the reaction, and obtain baking soda after drying. The process is relatively complicated

[0003] There is currently no solution to the above problem