In the metallurgical treatment of uranium ores large tonnages must be handled. Many ores are low grade so it becomes necessary to employ systems which can be operated on a continuous basis at low cost. A vast amount of research has gone into the development of suitable processes. One is solvent extraction, which has proven extremely efficient and simple in operation. Diligent work has gone into selection of the proper solvents. The solvent is a high flash point kerosene with 10% by volume of Di-2-ethyl hexyl phosphoric acid and 2.5% primary decyl alcohol or tributyl
The plant was originally designed to treat uranium ores with low lime-high vanadium content from the Lukachukai Mountains. The process utilized is known as the “Acid Cure” and had been developed for the most part by the AEC to increase recovery of vanadium values. Briefly, it involved “pugging” the ore with 10% water and 400-500 lbs. of concentrated sulfuric acid. The product was allowed to cure for six or more hours to convert the uranium and vanadium values into water soluble salts. Acid consumption and
Scrap metal, both ferrous and non-ferrous, present in industrial wastes, slags, smelter bi-products, sludges, refinery sweepings, ashes, etc., can be reclaimed in most instances at a profit and thus are made available for reuse in industry. Very substantial stockpiles of these scrap metal wastes are available for processing in the various industrial areas. 911metallurgist.com through its testing facilities during the past several years, has investigated many of these sources of good reclaimable metal
The principle of Counter Current Decantation is simply that, when water or solution is to act upon solids, both are made to pass, in contact, in opposite directions, so that at each end the strongest or most potent portion of either is acting upon the weakest or most exhausted portion of the other.
The recovery of dissolved gold and silver from slime pulp in the cyanide process, as first practiced, employed intermittent decantation.
Attempts to make this process continuous instead of intermittent were made as far back as 1902, but without success. The invention of the Dorr thickener furnished
The Sink and Float Separation Process is an alternative to the progressive depletion, during the last quarter century, of ores which could be economically treated by the old methods of gravity concentration necessitated the development of more efficient methods of concentration, the most successful and widely used of these methods being the Flotation Process. But during the past few years millman have realized that there is still a place for improved gravity concentration in a modern flowsheet, either in conjunction with flotation or alone. This is the result of the commercial
Gold Leaching Process Circuit NO. CY-1
This leach plant shows the continuous counter-current decantation system, in which all the ore is first reduced to a very fine state in the grinding mill-classifier circuit, in a Gold Leaching solution. The slime overflow of the classifier, usually 70%—200 mesh, or finer, is sent to the first thickener, known as the primary thickener.
Here the pregnant solution, containing a large part of the dissolved gold and silver values, overflows from the top of the thickener and is sent to a clarifier, then to the precipitating system where the gold and silver values are precipitated, the precipitate
The Froth Flotation Machine is universally used for all types of flotation problems. This machine finds a wide acceptance due to its flexibility in construction, which allows the machine to be adjusted to handle pulps with divergent physical characteristics, as well as the common and intricate metallurgical problems which confront the present day operator.
The Froth Flotation Machine is so designed that it will do a most acceptable job for coarse as well as fine flotation. The selectivity and flexibility
Metallurgical Recovery, which consists of the percentage of mineral saved, must not be confused with economic recovery which covers the percentage of the gross value of an ore recovered as a net profit. In other words, in commercial practice the prime object is the highest possible net profit over and above all costs. Thus a lower metallurgical recovery with a higher net profit is much more desirable than a higher metallurgical recovery with reduced net profit or an actual loss.
Another factor affecting economic recovery is the proximity of the operation to a market thus determining the proportion
In The Days of gravity concentration, the art of ore dressing developed on the cardinal principle of saving the values at as coarse a size as possible. Flowsheets were designed which featured an alternation of crushing and concentrating operations. Thus an ore might be crushed to ½ inch, jigged to yield a finished concentrate and a middling; the latter being recrushed to ¼ inch, jigged a second time to yield an additional finished concentrate and a middling, the latter crushed again to, say, 1/20 inch and tabled to yield a finished concentrate and a middling; tailing and so forth.
The flotation process is now used very extensively on gold ores, not only for concentrating the values without other processes, but also in conjunction with amalgamation, gravity concentration, or cyanidation leaching, to improve recoveries and to give lower treatment costs. In many instances, it is most profitable to recover the gold in the form of a concentrate, and either ship this product to a smelter, or amalgamate or cyanide the concentrates at the mine. In other cases, flotation