while washing plastic scrap grinding I tried to neutralize the caustic present in it with HCl.The addition of HCl caused a grey sludge which would float to the top leaving clear water below.I had thought that the resulting NaCl would be soluble in water and not create a problem but the floating sludge is problematic.When the water turns basic the sludge mixes with the water again.Has any one faced any similar difficulties? What is this floating sludge? How does one handle it?
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