METHOD FOR SUPPRESSING ELUTION OF FLUORINE AND/OR HEXAVALENT CHROMIUM

• Main Authors: KOBAYASHI YOSHIHIRO, SASAKI TATSUYA, ABIKO TAKASHI, KAMIYAMA TAIICHI, HORI TOSHISUKE
• Format: Patent
• Language: English; Japanese
• Published: 16.11.2015
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DISPOSAL OF SOLID WASTE; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; RECLAMATION OF CONTAMINED SOIL SOIL; REFRACTORIES; SLAG; TRANSPORTING; TREATMENT OF NATURAL STONE

PROBLEM TO BE SOLVED: To provide a method where both the suppression of the elution of fluorine and the suppression of the elution of hexavalent chromium or the suppression of the elution of fluorine or the suppression of the elution of hexavalent chromium can be sufficiently achieved.SOLUTION: A second substance contains Ca and/or S and the mixing amount of the second substance is determined based on the elution amount of Ca and/or the elution amount of S from the first substance and the elution amount of Ca and/or the elution amount (except hexavalent) of S from the second substance when suppressing the elution of fluorine and/or hexavalent chromium by mixing the second substance being an elution suppression material to the first substance where the elution amount of fluorine and/or the elution amount of hexavalent chromium exceeds the environmental quality standards. 【課題】フッ素の溶出抑制と六価クロムの溶出抑制との両方、或いは、フッ素の溶出抑制や六価クロムの溶出抑制を十分に行うことができるようにする。【解決手段】フッ素溶出量及び／又は六価クロム溶出量が環境基準を超えるような第１物質に対して、溶出抑制材である第２物質を混合してフッ素及び／又は六価クロムの溶出抑制を行うに際し、第２物質は、Ｃａ及び／又はＳを含有するものとし、第１物質からのＣａ溶出量及び／又はＳ溶出量と、第２物質からのＣａ溶出量及び／又はＳ溶出量（六価以外）に基づいて、第２物質の混合量を決定する。【選択図】図１