Method for recovering melamine from melamine waste water and co-producing desulfurizer
A technology of melamine and desulfurizer, applied in separation methods, chemical instruments and methods, natural water treatment, etc., can solve the problems of undisclosed special materials and centrifugal technology, unexplained industrial applications, insufficient to cover operating costs, etc., Achieve the effect of saving treatment costs, achieving zero emissions, and saving ammonia sources
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Embodiment 1
[0023] The 10L melamine crystallization mother liquor wastewater (in this wastewater, water is 98.5%, OAT is 0.02%, melamine is 1.5%, ammonia is 0.1%) of 74 ℃ of 10L melamine crystallization mother liquor wastewater produced in the melamine wet production process is sent into ammonia Lower the temperature to 10°C in the cold heat exchanger, then adjust the pH value to 11 with liquid ammonia, and then send it to the cyclone for solid-liquid separation to obtain melamine slurry and the remaining ammonia, OAT and trace melamine liquid two parts. The melamine slurry was dried to obtain 141 g of melamine with a purity of 98.2%, and the yield of melamine was 92%. The remaining liquid containing ammonia, OAT and trace amounts of melamine enters the desulfurizer storage tank, adjusts the mass percentage concentration of ammonia to 4% with liquid ammonia, and enters the simulated flue gas treatment process for desulfurization. After desulfurization, the final product containing ammoniu...
Embodiment 2
[0025] The 10L melamine crystallization mother liquor wastewater (in this wastewater, water is 97.8%, OAT is 0.04%, melamine is 1.4%, ammonia is 0.2%) of 68 ℃ of 10L melamine crystallization mother liquor wastewater produced in the melamine wet production process is sent into ammonia Lower the temperature to 5°C in the cold heat exchanger, then adjust the pH value to 10.8 with liquid ammonia, and then send it to the cyclone for solid-liquid separation to obtain melamine slurry and the remaining ammonia, OAT and trace melamine liquid two parts. The melamine slurry was dried to obtain 136 g of melamine with a purity of 98.1%, and the yield of melamine was 95%. The remaining liquid containing ammonia, OAT and trace melamine enters the desulfurizer storage tank, adjusts the mass percentage concentration of ammonia to 6% with ammonia water, and then enters the simulated flue gas treatment process for desulfurization. After desulfurization, the final product mainly contains ammonium...
Embodiment 3
[0027] The temperature that produces in the melamine wet production process is 70 ℃ of 1L melamine crystallization mother liquor wastewater (in this wastewater, water is 98.2%, OAT is 0.03%, melamine is 1.5%, and ammonia is 0.2%) into ammonia Lower its temperature to 1°C in a cold heat exchanger, then adjust its pH value to 10 with ammonia water with a mass percentage concentration of at least 10%, and then send it to a cyclone for solid-liquid separation to obtain melamine slurry and the remaining melamine-containing Ammonia, OAT and trace melamine liquid in two parts. The melamine slurry was dried to obtain 14.9 g of melamine with a purity of 98.2%, and the yield of melamine was 97%. The remaining liquid containing ammonia, OAT and trace melamine enters the desulfurizer storage tank, adjusts the mass percentage concentration of ammonia to 10% with waste ammonia water, and then enters the simulated flue gas treatment process for desulfurization. After desulfurization, the fin...
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