Technique for manganese recycling and comprehensive treatment of waste water and waste gas in electrolytic manganese industrial wastewater
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A technology for production wastewater and wastewater treatment, applied in neutralized water/sewage treatment, reduced water/sewage treatment, water/sewage multi-stage treatment, etc. High-level problems, to achieve the effect of reducing heavy metal content, low pollution, and eliminating costs
Active Publication Date: 2017-12-29
GUIZHOU SONGTAO JINRUI MANGANESE INDUSTRY CO LTD
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[0004] At present, in the recycling process of electrolytic manganese wastewater, most of the wastewater sources and reused destinations are the washing of manganese plates in the electrolysis workshop, and only a small part is used for washing cloth and cleaning tanks, etc., and the pH of the water used for rinsing manganese plates must be guaranteed to be Neutral, and the S content in water is low (SO 4 2- content is less than 2g / L), otherwise it will lead to abnormal appearance and color of the manganese plate and increase the sulfur content of the product
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Embodiment 1
[0020] Embodiment 1: chromium-containing waste water 30m 3 , where Cr 6+ The content is 36mg / L, add reducing agent ferrous sulfate 52kg to it, stir and react for 30min, then detect Cr 6+ 0.13mg / L, adding sodium hydroxide to adjust the pH value to 10, stirring for 30 minutes, and then carrying out precipitation and separation, the chromium slag enters the special slag field, and the remaining liquid is mixed into the manganese-containing wastewater;
[0021] Polishing wastewater 5m 3 , where: Cr 3+ 48.63mg / L, Ni 2+ 28.68mg / L, Fe 2+ 136.25mg / L, Cu 2+ 18.45mg / L, adjust the pH to neutral with sodium hydroxide, add 2.5kg of vulcanizing agent SDD, stir and react for 1 hour, carry out precipitation and separation, the slag enters the special slag yard, and the remaining liquid is mixed into manganese-containing wastewater;
[0022] Comprehensive waste water 100m 3 , where the manganese content is 1800mg / L, add 700kg of precipitating agent ammonium bicarbonate, stir and rea...
Embodiment 2
[0025] Embodiment 2: chromium-containing waste water 30m 3 , where Cr 6+ The content is 55mg / L, add reducing agent ferrous sulfate 80kg to it, stir and react for 30min, then detect Cr 6+ to 0.09mg / L, add sodium hydroxide to adjust the pH value to 10, stir for 30 minutes, and then carry out precipitation and separation. The chromium slag enters the special slag field, and the remaining liquid is mixed into manganese-containing wastewater;
[0026] Polishing wastewater 5m 3 , where: Cr 3+ 69.23mg / L, Ni 2+ 36.68mg / L, Fe 2+ 200.25mg / L, Cu 2+ 10.45mg / L, adjust the pH to neutral with sodium hydroxide, add 2.5kg of vulcanizing agent SDD, stir and react for 1 hour, carry out precipitation and separation, the slag enters the special slag yard, and the remaining liquid is mixed into manganese-containing wastewater;
[0027] Comprehensive waste water 100m 3 , where manganese content is 2150mg / L, add precipitant ammonium bicarbonate 840kg, stir and react for 2.8h, the measured ...
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Abstract
The invention discloses a technique for manganese recycling and comprehensive treatment of waste water and waste gas in electrolytic manganese industrial wastewater. The technique includes steps of disposing chromate wastewater and polishing wastewater; adding reducing agent in the chromate wastewater; reducing Cr6+ to Cr3+; then adding hydroxide to adjust pH, and generating chromic hydroxide sediment; making slag stack at a special slag field after being settled and separated, and making filter fluid enter the manganese wastewater; treating the polishing wastewater; recycling manganese, performing sulfate radical treatment; and others. The technique is segmented in the disposing process, the chromate wastewater and polishing wastewater are treated respectively; the wastewater with heavy metal ion is treated at first, thus the heavy metal content in the manganese carbonate slag is reduced, and the technique is good for recycling the manganese carbonate slag; the main water use in the technical process of the electrolytic manganese production is carried out at the flushing section, and the sulfate radical treatment technique is added to the wastewater treatment, thus the SO42- content is reduced, the sulfate radical is reduced from over 10g/L in the past to about 2g/L; the influence of the sulfate radical on the sulfur containing of the manganese piece in the electrolysis flushing water is reduced greatly.
Description
technical field [0001] The invention relates to the technical field of treatment and recycling of waste gas slag from electrolytic manganese production, and relates to the treatment of chromium-containing wastewater, the treatment of polishing wastewater, and the recycling of manganese. Environmentally friendly comprehensive treatment process for water treatment and recycling of water resources. Background technique [0002] According to the "Manganese Pollution Control Plan for the Border Areas of Hunan, Chongqing, and Guizhou" issued by the State Environmental Protection Administration, and the "Manganese Industry Pollution Control and Inspection Work Plan for the Border Areas of Hunan, Chongqing, and Guizhou Provinces (Cities)", and Guizhou Environmental Protection The "Notice on Requiring Songtao Huifeng Manganese Industry Co., Ltd. and other 9 enterprises to treat the production wastewater in the factory area and realize recycling within a limited period" issued by the ...
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