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BLOCK FLOW DIAGRAM <br /> Site Name : Applied Aerospace Year : 2018 <br /> FINAL PRODUCTS <br /> RAW MATERIALS/ NONE HAZARDOUS <br /> FEED STOCKS t WASTE <br /> 7CWC 791 bo <br /> PHOSPHORIC ACID ( 37 , 846 lbs ) <br /> SULFURIC ACID/ FPL ETCH PROCESS CWC 792 <br /> SODIUM DICHROMATE ( 111 , 642 lbs ) <br /> ( Deoxidizes solution ) <br /> The FPL ( Forest Products Laboratory) etch process is a process licensed by <br /> Boeing . The phosphoric acid solution is used for anodizing aluminum parts and <br /> the sulfuric acid /sodium dichromate solution is used for deoxidizing aluminum <br /> parts . Once the acid is spent , it must be disposed of as hazardous waste . <br /> Due to specification changes that require tighter concentration ranges , the solutions <br /> must also be disposed of when those ranges are close to being exceeded . <br /> FIGURE 3 <br />