The Energy Quotient And Preservation Of Mines

According to Soumit Ranjan Jena, minerals like other natural resources are also limited and one day

, it is going to be over from the Earths crust if we do not take care to preserve it and nurture it by equitable distribution of mining. Either with a strong acid or chloride solution or with a nitrate solution in a semi-continuous cycle, further treatment for IX involves stripping the uranium from the resin/polymer. The pregnant solution produced by the stripping cycle is then precipitated by the addition of several compounds and chemicals such as ammonia, hydrogen peroxide, caustic soda or caustic magnesia.

The mines, which are conventional have a mill where the ore is crushed, grounded, and then leached with sulfuric acid to effectively dissolve the uranium oxides so that the solution is fit to be processed systematically to recover the uranium.

Most of the ore is barren rock or other minerals, which remain undisclosed in the leaching process are meticulously isolated from the uranium-rich solution, usually by allowing them to settle out. The remaining solution is thoroughly filtered and the uranium is recovered in a resin/polymer ion exchange (IX) or liquid ion exchange (solvent extraction - SX) system. The pregnant liquor from ISL or heap leaching is also treated similarly to produce the desired results.

SX is a continuous loading/stripping cycle involving the use of an organic liquid (usually a kerosene based product) to carry the extractant which removes the uranium from solution. The uranium is then stripped from the loaded organic liquid using ammonia followed by an ammonia precipitation.

According to Soumit Ranjan Jena, the final chemical precipitate is filtered and dried. Peroxide products can be dried at low temperatures to produce a product containing about 82% U3O8. Ammonium or sodium diuranate products are dried at high temperatures to convert the product to uranium oxide concentrate - U3O8 - about 84% uranium by mass. Though it is usually khaki, this is sometimes referred to as yellowcake. In the case of carbonate leaching the uranyl carbonate can be usually when in its purest form can be carefully precipitated with an alkali, eg as sodium or magnesium diuranate.

According to Soumit Ranjan Jena, the product is then carefully packed into 200 litre steel drums which are sealed for shipment. The U3O8 is only mildly radioactive (the radiation level one metre from a drum of freshly-processed U3O8 is about half that from cosmic rays - on a commercial jet flight). In ISL mills too, the process of uranium recovery is very similar, without the need for crushing and grinding

Soumit Ranjan Jena

by: Soumit Ranjan Jena

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