Alkali-added wet type oxidation catalytic desulfurization waste solution recycling method

Abstract

The invention discloses an alkali-added wet type oxidation catalytic desulfurization waste solution recycling method. The method comprises the following steps of: pressurizing a desulfurization solution into a filter via a pump, then entering a decoloring kettle, adding activated carbon to decolor the desulfurization solution, pressurizing into a sulfo-evaporation kettle through the pump via a decoloring storage tank, evaporating the solution to a certain concentration in the evaporation kettle, placing into the filter for filtering, then crystallizing filtrate, and finally separating in a centrifuge to obtain a Na2S2O3 product; and pressing the filtrate after centrifugation into a SCN-evaporation kettle through the pump via a storage kettle, evaporating the solution to a certain concentration in the evaporation kettle, placing into the filter for filtering, enabling the filtrate to enter the SCN-evaporation kettle for crystallization, then separating in the centrifuge to obtain a rough NaCNS product, performing two times of solution, decoloring, evaporation and crystallization on the rough product, and then separating in the centrifuge to obtain a final fine NaCNS product. According to the method disclosed by the invention, the mature and advanced filtration, concentration, crystallization and separation process flows are selected, and all process sections are mutually linked and supplement each other, so that the optimization of the whole process is achieved.

Description

technical field [0001] The invention belongs to the technical field of environmental wastewater treatment, and aims at recycling, treating and reusing desulfurization waste liquid and its production process technology in coking enterprises adopting wet oxidation catalytic desulfurization with added alkali. Background technique [0002] The waste liquid comes from the desulfurization process of the coking chemical industry, and the desulfurization liquid mainly produces NaCNS, Na 2 S 2 o 3 , and other salts, their production increases the consumption of alkali and reduces the desulfurization efficiency. On the other hand, it is a valuable chemical raw material, and the treated water returns to the desulfurization system for continued use. Existing technology: The desulfurization method of wet oxidation catalytic method with external alkali is an advanced method, the desulfurization efficiency is over 98%, the solution is non-toxic, the adaptability, stability and pressure ...

AI Technical Summary

Problems solved by technology

In fact, the more important thing is that the sulfur is circulated in the system with coal, gas, and desulfurization liquid, and it is not really disposed of. It also increases the processing load of the desulfurization device, and the replaced desulfurization liquid is more likely to generate side salts, which reduces the desulfurization efficiency.

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