释义 |
wel·don process \ˈweldən-\ noun Usage: usually capitalized W Etymology: after Walter Weldon died 1885 English chemist : a process used formerly for the recovery of manganese dioxide in making chlorine from hydrochloric acid in a stoneware still by adding lime to the still liquor and oxidizing with air to precipitate a mud containing calcium manganite and yielding chlorine when recirculated and treated with hydrochloric acid |