DETECTING SILICA IN LIMESTONES

DR. ERIK HOGBERG, SWEDISH GEOLOGIST WITH CEMENTOCH-BETONG LABORATORIET, MALMO, HAS DEVELOPED A UNIQUE STAINING METHOD FOR DETECTING SILICA IN LIMESTONE. A SOLUTION CONSISTING OF 2 GRAMS METHYLENE BLUE, 450 GRAMS CONCENTRATED HYDROCHLORIC ACID AND 1,000 GRAMS WATER IS SPRAYED ON THE QUARRY FACE, ALLOWED TO REACT FOR 2 MINUTES AND THEN RINSED OFF THE FACE. FOLLOWING THE REACTION, THE SILICA-RICH LIMESTONE AREAS TURN DEEP BLUE, WHEREAS PRIOR TO SPRAYING THESE SAME AREAS COULD NOT BE DIFFERENTIATED FROM THE PURE LIMESTONE.

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  • Accession Number: 00217938
  • Record Type: Publication
  • Files: TRIS
  • Created Date: Apr 27 1974 12:00AM