Usually means: Waste byproduct from petroleum refining.
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We found 7 dictionaries that define the word sludge acid:

General (6 matching dictionaries)
  1. sludge acid: Merriam-Webster
  2. sludge acid: Wordnik
  3. sludge acid: Wiktionary
  4. Sludge acid: Dictionary.com
  5. sludge acid: FreeDictionary.org
  6. Sludge acid: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. sludge acid: Encyclopedia

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Definitions from Wiktionary (sludge acid)

▸ noun:  Impure dark-coloured sulphuric acid that has been used in the refining of petroleum.

Similar:
muriatic acid, lime pit, lime sulphur, lead sulphate, sulphostannic acid, sweet crude, lead sulfate, lithic acid, asphalt, slam, more...

Opposite:
alkaline, base, basic

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Similar:
muriatic acid, lime pit, lime sulphur, lead sulphate, sulphostannic acid, sweet crude, lead sulfate, lithic acid, asphalt, slam, more...

Opposite:
alkaline, base, basic



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