Recycling treatment method of lignin production wastewater
A lignin and waste water technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problems of high cost, waste of resources, waste of sulfuric acid, etc., and increase the product The effect of high income and utilization efficiency and simple equipment
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[0041] After the production of lignin, the wastewater is heated-----evaporate. After the evaporated waste liquid is cooled and recycled, the mirabilite and the black liquor containing sulfuric acid are crystallized and separated. Barium sulfate and sodium sulfide produce a large amount of sodium sulfide by evaporation and concentration into a 40%-50% solution.
[0042] The waste water enters the tower through the feed screw nozzle 13 through the pump feed pipe 3, and falls freely into a mist. The feed screw nozzle 13 is made of acid-proof stainless steel material. The high-pressure flue gas enters the Yanlong gas cabinet, enters the tower through the Yanlong duct 7 and the air inlet 6 of the induced draft fan, and is sent into the evaporator waste heat flue gas at about 170°C-270°C. The liquid mist is directly heated to evaporate, and the superheated steam rises with the smoke Entering the chimney, contact with the multi-layer grid and the filler 5 on the grid, multi-layer overla...
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