More than a century ago, gold ores were treated by roasting and subsequent leaching with aqueous solution of chlorine. Ross reported that chlorine consumption was 3 10 kilograms per tonne of ore and the gold extraction was 90 98 per cent MacArthur and Forrest introduced the cyanidation process in 1887. Cyanide
For elevating the leaching liquid from the well a wooden pump is used. The small quantity of metal used in its construction, for fastening the valves, etc., is not injurious. In case, however, a pump is used to raise weak lixivium from the gold leaching, it must be constructed entirely without metal, except lead, in those parts which come in contact with the lixivium.
Leaching Vat. 51. Leaching Vat. The leaching is done in wooden tubs, which are coated inside with a mixture of coal tar and asphalt melted together, and applied whilst hot. As the chlorination of gold is also effected in these tubs, they are provided with covers when that metal is present in the ore. If there is no gold, covers are not needed, nor is the coating of the tubs with tar so
67. The apparatus consists of a leaden tub a, in which the materials are put, and which is surrounded by a water chamber 6, also of lead, the outer wall of which rises as high as the top of the cover, c, and in which the curtain of the cover rests, forming what is called a water joint. The water should be six inches deep, or more.
34. A Reverberatoiy Furnace is simply an oven. There is a fire place at one end and a flue at the other, and the ore to be roasted is laid on a horizontal hearth between them. In the side walls are openings, which admit air, and allow the workman to turn the ore over, from time to time, with a long hoe, or rake.
18/02/2021· These materials must possess the following characteristics: Gold and silver values are leachable by cyanidation, size of the gold particles is extremely small, the host rock is porous to cyanide solution, and remains permeable during the relatively long leach cycle, gold particles in ores of low porosity are liberated or exposed by fracturing and crushing,
14/07/2019· The successful application of heap leaching to sedimentary gold ores will depend upon adequate test work, sound engineering, and thorough feasibility studies for each deposit. Basic criteria or technologies have been developed and are rapidly being improved for the heap leaching of copper and uranium ores.
INTRODUCTION Gold ores can be broadly categorized as free milling and refractory depending on their response to cyanide leaching 1. A gold recovery of >90% can be readily achieved with a conventional cyanide leaching of free milling ores 2.
07/09/2016· How to Leach Gold Leaching is usually carried out in circular tanks of wood or steel with a false bottom covered with some filtering medium. A grid is first made on the bottom of the tank by laying wooden strips about 2 in. by 3 in. on edge, a foot apart, and nailing across and on top of these, smaller strips having a square section of 1 to 1½ in., and leaving 1 in. spaces
This chamber is closed on the working side of the furnace and open on the other, and the ore is discharged into it through an opening about a foot in diameter, in the hearth near the working door. The opening is closed by an iron plate, which rests on a rabbet a couple of inches below the level of the hearth, and the depression thus formed is filled with roasted ore.
June 10, 2020
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