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Mineral CSA is a finely ground calcium silicate feedstock produced by the U.S.-based company Harsco Minerals, which provides a solution for correcting acidic conditions and managing toxic metals associated with acid mine drainage (AMD). Mineral CSA has been used on operating and abandoned mine sites since 1991.〔(【引用サイトリンク】url=http://www.harscominerals.com/csa/csa.pdf )〕 It is a highly refined, repurposed calcium silicate aggregate. Its parent material is a downstream stainless steel furnace slag that undergoes “ageing” processes, fine grind pulverizing, and extensive metal separation (>99.95% of all metals removed) to remove impurities. Mineral CSA was manufactured by Recmix, established in 1989 in Canonsburg, PA. In 1996, Recmix opened a second manufacturing facility in Sarver, PA.〔(【引用サイトリンク】url=http://www.aboutus.org/Recmix.com#- )〕 In early 2007, Harsco Corporation acquired the company as part of its Harsco Minerals division (headquartered in Mechanicsburg, PA).〔(【引用サイトリンク】url=http://www.secinfo.com/d1znFa.tYq.9.htm )〕 ==Raising pH== Calcium silicate neutralizes active acidity by removing free hydrogen ions from the bulk solution, thereby increasing pH. As its silicate anion captures H+ ions (raising the pH), it forms monosilicic acid (H4SiO4), a neutral solute. Monosilicic acid remains in the bulk solution to aid in correcting the adverse effects of acidic conditions. CaSiO3 + 2H+ + H2O → Ca2+ + H4SiO4 (monosilicic acid) (Calcium silicate + Acidity + Water → Calcium + Monosilicic acid (neutral solute)) In the bulk solution, the silicate anion of Mineral CSA is very active in neutralizing H+ cations in the soil solution. Its CCE value is 90 – 100% and its relative neutralizing value is 98%. Mineral CSA’s (calcium silicate) ability to ameliorate the adverse effects of acidic soil allows it to aid in the revegetation of acidic soils. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Mineral CSA (brand)」の詳細全文を読む スポンサード リンク
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