登入選單
返回Google圖書搜尋
其他書名
Slotted-type bolts
出版U.S. Department of the Interior, Bureau of Mines, 1953
URLhttp://books.google.com.hk/books?id=7-HhxUeub80C&hl=&source=gbs_api
EBookFULL_PUBLIC_DOMAIN
註釋The investigation reported in this paper is one of several included in a broad program of developing new or improved concentration processes for the oxidized and partly oxidized deposits of lead and zinc. A sample from the Playter lease, Newton County, Mo., containing pyromorphite was successfully concentrated by fatty acid flotation to a grade of over 62 percent lead. Owing to the presence of a high content of slime-size values, the overall recovery of lead at that grade was limited to 44 percent.