Comprehensive recovery of uranium and molybdenum in oxidized ore
2019-11-23 15:04:19
Uranium ore is often accompanied by molybdenum , which is sometimes accompanied by uranium. The relationship between uranium and tungsten and molybdenum is similar. Uranium and molybdenum have the symbiosis between minerals, and uranium and molybdenum are the same minerals. Most of the molybdenum-containing minerals found in nature contain uranium, which constitutes a series of uranium-containing molybdates.
The recovery of molybdenum from uranium ore is consistent with the process and reagents for extracting uranium, and usually no additional means are required. When the leaching of uranium ore by chemical beneficiation , the molybdenum is also leached into the acidic or alkaline uranium extract. If the uranium ore contains a small amount of molybdenum sulfide in the sulphide ore, the immersion liquid must be supplemented with a small amount of oxidant (nitric acid or sodium hypochlorite, depending on the uranium acid and alkaline selection). The soda (Na 2 CO 3 ) leaching reaction is as follows:
U 3 O 8 + 9Na 2 CO 3 + | 1 | O 2 +3H 2 O = 3Na 4 [ UO 2 ( CO 3 )] + 6NaOH |
2 |
MeMoO 4 + Na 2 CO 3 =Na 2 MoO 4 + MeCO 3
The uranyl trisulfide ion [UO 2 (CO 3 )] 4- formed by the reaction enters the extract simultaneously with the molybdate [MoO 4 ] 2- .
Separation of uranium-containing and molybdenum-containing extracts is usually carried out in several steps of co-extraction, stripping and selective precipitation.
Co-extraction: In an acidic medium, a tertiary amine (N235) is used as an extractant to extract ions of uranium and molybdenum in the acidic extract.
Stripping: The soda (Na 2 CO 3 ) solution is used as a stripping agent, and the uranium and molybdenum are back extracted into the soda liquid with organic molybdenum to purify the uranium and molybdenum.
Selective precipitation: Na 2 S was added to the stripping solution and adjusted to pH = 2 ± with sulfuric acid for selective precipitation. At this time, the uranium complex ions remain in the solution, and the molybdenum is selectively precipitated from the solution in the form of molybdenum trisulfide (MoS 3 ). Uranium and molybdenum are well separated.
For the extract containing higher molybdenum, Na 2 S can be directly added to the extract without co-extraction and stripping, and MoS 3 can be selectively precipitated in an acidic medium (pH=2±), and the uranium remains. In the mother liquor, uranium-molybdenum separation is achieved.
For the purer uranium-molybdenum extract, it is often separated from the tertiary amine (N235) organic phase by selective stripping without the above stripping and precipitation. The selective stripping is to extract the uranium from the organic phase by using the acidic solution of NaCl. At this time, the molybdenum remains in the organic phase, and the molybdenum is extracted from the organic phase by the Na 2 CO 3 solution, thereby achieving the separation of uranium and molybdenum.
For uranium minerals in molybdenum ore, uranium minerals are often recovered from the tailings of flotation molybdenum.
Engine Piston Rings,High Performance Piston Ring,Steel Piston Rings,Steel Piston Rings
KINCON POWER TECHNOLOGY CO.,LTD , https://www.kinconparts.com