...Snowflake gypsum (alabaster) is a type of gypsum that is made in large quantities as a by-product of the chemical industry. In addition to natural gypsum, chemical gypsum is produced in large quantities as a by-product of the chemical industry. Examples include phosphate gypsum from the phosphoric acid manufacturing industry, glauconite gypsum made from glauconite by-products in the chemical industry and calcium chloride in the soda industry, and flue gas desulfurized gypsum from the process of removing sulfur dioxide from flue gas. Japan's gypsum resources are almost entirely dependent on these chemical gypsums, which is a completely different situation from other countries. *Some of the terminology explanations that mention "chemical gypsum" are listed below. Source | Heibonsha World Encyclopedia 2nd Edition | Information |
…粒が細かく塊状のものを雪花セッコウ(アラバスター)といい,彫刻用などに用いられる。 天然産のセッコウのほかに化学工業からの副産物として多量に製出するセッコウは化学セッコウとよばれ,リン酸製造工業からのリン酸セッコウ,化学工業の副生ボウ硝とソーダ工業の塩化カルシウムからのボウ硝セッコウ,排煙中の亜硫酸ガス除去工程からの排脱セッコウ(排煙脱硫セッコウ)などがある。日本のセッコウ資源はほとんどこれらの化学セッコウに依存しており,外国とまったく事情を異にする。… ※「化学セッコウ(石膏)」について言及している用語解説の一部を掲載しています。 出典|株式会社平凡社世界大百科事典 第2版について | 情報 |
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