Clean production method for recovering uranium and molybdenum from wrapped uranium and molybdenum ores

Abstract

The invention discloses a clean production method for recovering uranium and molybdenum from wrapped uranium and molybdenum ores and belongs to the field of chemical engineering and metallurgy. The clean production method comprises the following steps of evenly mixing the crushed wrapped uranium and molybdenum ores with additives, and then adding water for pelletizing; conveying the pelletized ores into a rotary kiln for roasting; cooling the roasted ores and then conducting heaping; and then spraying a leaching agent to conduct leaching. According to the clean production method for recoveringthe uranium and molybdenum from the wrapped uranium and molybdenum ores, the ores and a sulfur-fixing agent are mixed evenly and are subjected to pelletizing; in the roasting process, not smoke and dust are generated; 95% or more of sulfur can be solidified in the ores; the roasted ores can be subjected to heap leaching; the leaching rates of the uranium and molybdenum in the ores can reach up to90% and 80% or more correspondingly; the solid-liquid separation step is omitted; the solid content of a leaching solution is low, and the leaching solution can be directly used for subsequent extraction separation. The clean production method has the advantages of being reasonable in technological process, high in production efficiency, high in metal recovery rate, friendly to the operating environment and the like.

Description

technical field [0001] The invention belongs to the fields of chemical industry and metallurgy, and in particular relates to a clean production method for recovering uranium and molybdenum from wrapped uranium-molybdenum ore. Background technique [0002] Encapsulated uranium-molybdenum ores are mainly distributed in the Hebei-Inner Mongolia metallogenic belt. They are medium-low temperature hydrothermal porphyry-type uranium-molybdenum ores. The properties of this type of ore are very complex, and its notable feature is that there is a special form of molybdenum minerals in the ore- Glysolite forms a dense sulfide package on the attached ore, which hinders the penetration of the leaching agent into the inclusion and the oxidation of the molybdenum mineral by the oxidant, increasing the difficulty of leaching uranium and molybdenum. Therefore, for this type of ore The extraction technology of uranium and molybdenum has become a hot issue in the metallurgical field. [0003]...

AI Technical Summary

Problems solved by technology

[0003] For this type of refractory uranium-molybdenum ore, in order to improve the leaching rate of uranium and molybdenum, most of them adopt enhanced oxidation acid leaching technology, high pressure alkali leaching technology and oxidation roasting technology, among which the most commonly used method in enhanced oxidation acid leaching technology is permanganate Potassium enhanced oxidation leaching, hydrogen peroxide enhanced oxidation leaching and nitric acid enhanced oxidation leaching, etc. Although the enhanced oxidation leaching process can improve the leaching of uranium and molybdenum, there are problems such as large oxidant consumption and high production costs. In addition, because the ore itself is clay and the leaching solution There are many organic matters, which makes the solid-liquid separation of leached pulp extremely difficult

The use of high-pressure alkaline leaching technology has problems such as high equipment cost, high maintenance cost, difficult operation, difficult solid-liquid separation, and complicated recovery process of uranium and molybdenum metals.