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The steel industry is in the process of manufacturing and processing will produce a lot of waste acid wash,mainly use 2 kinds of acids,hydrochloric acid and sulfuric acid,be called waste acid wash. Due to high concentration hydrochloric acid or sulfuric acid high concentration of iron ions, contains about 120 grams of iron per liter, have the value of recycling,according to the "Environmental Waste Determination Standards" promulgated by the Environmental Protection Agency, this waste acid liquid is a corrosive business waste in hazardous business waste. Currently most of the companies commission large enterprises use roasting or neutralization raise its pH and bury it. As the production line increases, the production of waste liquid is increasing,increased processing costs,become an urgent problem for the industry. The main purpose of this studyto help solve the waste disposal problems encountered in the steel processing industry. First, the current situation of the steel processing industry, waste acid washing liquid production, removal and reuse status, etc. Background data analysis of waste acid production, further analysis of related recycling technologies at home and abroad, reuse of experiments to complete the recycling of waste acid washing liquid, Evaluating the feasibility of recovering waste acid washing solution by co-precipitation method. This study collected the waste acid washing liquid produced by domestic steel processing plants and completed the research object, discussion on the Feasibility of Using the Co-precipitation Method for Iron Resource Utilization in the Laboratory. Batch experiments using different operating temperatures, pH, reaction time, NaOH concentration, etc. Establish the optimal response conditions for resource utilization. Establish the optimal response conditions for resource utilization, whether it can comply with legal norms. Recycling experiment of iron in waste acid washing solution by co-precipitation method, 1 liter of waste acid can produce more than 360 grams of iron metal. Consider factors such as resource recovery rate, energy consumption, equipment material requirements, and iron production. The temperature is 80°C, the operation time is 90 min,1M NaOH and the pH8 is the best. Dissolved resource products are all within national standards and the Cd content in the filtrate is higher than the discharge water standard, and it needs to be treated before it can be discharged.
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