Recovery method of chemical polishing waste acid
The invention provides a chemical polishing waste acid recovery method which comprises the following steps: collecting phosphoric acid-containing wastewater obtained by first washing after chemical polishing, and enriching the phosphoric acid-containing wastewater in a chemical polishing washing wat...
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| creator | ZHANG DONGPING HUANG YUWEN ZHANG HAIPENG GAO WEI YANG XIUGAO XU FUHONG HUANG BAOXIAN |
| description | The invention provides a chemical polishing waste acid recovery method which comprises the following steps: collecting phosphoric acid-containing wastewater obtained by first washing after chemical polishing, and enriching the phosphoric acid-containing wastewater in a chemical polishing washing water collection device as to-be-treated acid-containing wastewater; filtering the to-be-treated acid-containing wastewater to remove impurities to obtain filtered wastewater; the filtered wastewater is placed in a concentration tank to be subjected to low-temperature negative-pressure concentration evaporation, concentrated acid and distilled water are obtained, the pressure in the concentration tank is 10-20 KPa, the evaporation temperature in the concentration tank is 70-90 DEG C, and the specific gravity of the concentrated acid is larger than or equal to 1.7 kg/L; placing the concentrated acid in a stirring and flocculating device, adding a flocculating agent for flocculating with metal cations into the stirring |
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filtering the to-be-treated acid-containing wastewater to remove impurities to obtain filtered wastewater; the filtered wastewater is placed in a concentration tank to be subjected to low-temperature negative-pressure concentration evaporation, concentrated acid and distilled water are obtained, the pressure in the concentration tank is 10-20 KPa, the evaporation temperature in the concentration tank is 70-90 DEG C, and the specific gravity of the concentrated acid is larger than or equal to 1.7 kg/L; placing the concentrated acid in a stirring and flocculating device, adding a flocculating agent for flocculating with metal cations into the stirring</description><language>chi ; eng</language><subject>CHEMICAL SURFACE TREATMENT ; CHEMISTRY ; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL ; COATING MATERIAL WITH METALLIC MATERIAL ; COATING METALLIC MATERIAL ; DIFFUSION TREATMENT OF METALLIC MATERIAL ; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL ; 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filtering the to-be-treated acid-containing wastewater to remove impurities to obtain filtered wastewater; the filtered wastewater is placed in a concentration tank to be subjected to low-temperature negative-pressure concentration evaporation, concentrated acid and distilled water are obtained, the pressure in the concentration tank is 10-20 KPa, the evaporation temperature in the concentration tank is 70-90 DEG C, and the specific gravity of the concentrated acid is larger than or equal to 1.7 kg/L; placing the concentrated acid in a stirring and flocculating device, adding a flocculating agent for flocculating with metal cations into the stirring</abstract><oa>free_for_read</oa></addata></record> |
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| subjects | CHEMICAL SURFACE TREATMENT CHEMISTRY COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATIONOR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL COATING MATERIAL WITH METALLIC MATERIAL COATING METALLIC MATERIAL DIFFUSION TREATMENT OF METALLIC MATERIAL INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION INGENERAL METALLURGY MULTI-STEP PROCESSES FOR SURFACE TREATMENT OF METALLICMATERIAL INVOLVING AT LEAST ONE PROCESS PROVIDED FOR IN CLASSC23 AND AT LEAST ONEPROCESS COVERED BY SUBCLASS C21D OR C22F OR CLASS C25 NON-MECHANICAL REMOVAL OF METALLIC MATERIAL FROM SURFACE TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE |
| title | Recovery method of chemical polishing waste acid |
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