Transactions . iswork was great, and the total cost of the plant amounted to§31, Every effort was used to secure solidity of con-struction, and nothing but good material and workmanship wasemployed throughout. The plant was located to receive the tailings direct from themill, in two distributing-tanks, 14 ft. in diameter and 10 ft. inheight. The tanks are fitted with annular launders around therim and are filled with water before the admission of the tail-ings; the overflow is carried off in the annular launder-, andthence in iron pipes to the waste-launder under the leaching-vats. In o
Transactions . iswork was great, and the total cost of the plant amounted to§31, Every effort was used to secure solidity of con-struction, and nothing but good material and workmanship wasemployed throughout. The plant was located to receive the tailings direct from themill, in two distributing-tanks, 14 ft. in diameter and 10 ft. inheight. The tanks are fitted with annular launders around therim and are filled with water before the admission of the tail-ings; the overflow is carried off in the annular launder-, andthence in iron pipes to the waste-launder under the leaching-vats. In order to control the proportion of slimes allowed toescape, a slimes-arrester is provided. This consists of a sheet 754 TREATMENT OF TAIMNiiS BY THE CYANIDE PROCESS. of iron, 10 in. wide, fitted inside each lank, about 1 in. from the staws. extending all the way round, and held in positionby 8 iron brackets. This sheet is arranged so that it can In-raised entirely above the level of the tank, or lowered and im-. mersed until the upper edge is but slightly above the level ofthe water. In this position it is most effectual in arresting theoutflow of slimes. The exact position of the sheet can beregulated to suit the character of the ore under treatment. I i;i \ I mi \ i OF I ULINQ8 BY THE CYAN] DB PROOl 755 The tailings are distributed in these tanks by eight arm dis-tributors, working automatically. The tank- are fitted withfilters and are connected, beneath the filter, with thewswater receiver, which is in turn connected with the vacuum-pump. The cloth filters are protected by perforated boardsagainst injury in shoveling out the tailings. When the tanksarc full, the Bupernatant water is siphoned off, and connectionis then made1 with the waste-water vacuum-tank for abouttwelve hours. At the end of this time the tailings are sonearly dry that a shovelful tin-own into the vat below breaksup into a loose pile of sand. (The importance of this tact willbe shown later.) The distributo
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Keywords: ., bo, bookcentury1800, bookdecade1870, booksubjectmineralindustries
