A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
REDUCTION TREATMENT METHOD OF SUBSTANCE CONTAINING CHROMIUM OXIDE, AND MANUFACTURING METHOD OF CIVIL ENGINEERING WORK MATERIAL
To provide a reduction treatment method of a substance containing chromium oxide capable of further reducing Crelution amount.SOLUTION: A reduction treatment method of a substance containing chromium oxide prepares a substance containing chromium oxide, sets water content rate with respect to water absorption rate of the substance containing chromium oxide to be 90% or less, and contacts the substance containing chromium oxide having the water content rate with respect to the water absorption rate of the substance containing chromium oxide of 90% or less, and aqueous solution containing a sulfur compound having oxidation number +5 or less by a total amount of sulfur content of 0.5 g/L or more.SELECTED DRAWING: None
【課題】Ｃｒ６＋溶出量をより低減できるクロム酸化物含有物質の還元処理方法を提供する。【解決手段】クロム酸化物含有物質を準備し、上記クロム酸化物含有物質の吸水率に対する含水率を９０％以下とし、吸水率に対する含水率を９０％以下とした上記クロム酸化物含有物質と、酸化数が＋５価以下の硫黄の化合物を硫黄分の合計量で０．５ｇ／Ｌ以上含有する水溶液とを接触させる、クロム酸化物含有物質の還元処理方法。【選択図】なし
REDUCTION TREATMENT METHOD OF SUBSTANCE CONTAINING CHROMIUM OXIDE, AND MANUFACTURING METHOD OF CIVIL ENGINEERING WORK MATERIAL
To provide a reduction treatment method of a substance containing chromium oxide capable of further reducing Crelution amount.SOLUTION: A reduction treatment method of a substance containing chromium oxide prepares a substance containing chromium oxide, sets water content rate with respect to water absorption rate of the substance containing chromium oxide to be 90% or less, and contacts the substance containing chromium oxide having the water content rate with respect to the water absorption rate of the substance containing chromium oxide of 90% or less, and aqueous solution containing a sulfur compound having oxidation number +5 or less by a total amount of sulfur content of 0.5 g/L or more.SELECTED DRAWING: None
【課題】Ｃｒ６＋溶出量をより低減できるクロム酸化物含有物質の還元処理方法を提供する。【解決手段】クロム酸化物含有物質を準備し、上記クロム酸化物含有物質の吸水率に対する含水率を９０％以下とし、吸水率に対する含水率を９０％以下とした上記クロム酸化物含有物質と、酸化数が＋５価以下の硫黄の化合物を硫黄分の合計量で０．５ｇ／Ｌ以上含有する水溶液とを接触させる、クロム酸化物含有物質の還元処理方法。【選択図】なし
REDUCTION TREATMENT METHOD OF SUBSTANCE CONTAINING CHROMIUM OXIDE, AND MANUFACTURING METHOD OF CIVIL ENGINEERING WORK MATERIAL
クロム酸化物含有物質の還元処理方法および土木工事用材料の製造方法
MATSUNAGA HISAHIRO (author)
2019-02-07
Patent
Electronic Resource
Japanese
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