A method for separating and producing rare earths by using iron-containing rare earth raw ore

Abstract

The invention belongs to the field of comprehensive smelting of rare earth ores by fire method and wet method, and in particular relates to a method for separating and producing rare earths by using iron-containing rare earth raw ores. Through the setting of steps such as grinding, mixing, agglomeration, rotary hearth furnace material distribution, rotary hearth furnace smelting and separation, roasting, and water immersion, pearl iron products and rare earth products are obtained, which greatly improves production at a relatively low cost. Efficiency and rare earth leaching rate.

Description

technical field [0001] The invention belongs to the field of comprehensive smelting of rare earth ores by fire method and wet method, and in particular relates to a method for separating and producing rare earths by using iron-containing rare earth raw ores. Background technique [0002] my country has very large rare earth reserves, accounting for 35% of the world's reserves. With the development of metal material science, the role of rare earths has been paid more and more attention. Therefore, how to extract rare earths to the maximum has become the current research and development focus. Rare earths are generally symbiotic with other metal minerals. For example, the Baiyan Obo Iron Mine is a deposit of rare earths, iron and niobium symbiotic (that is, iron-containing rare earth ores). At present, the conventional smelting and extracting rare earth methods are divided into wet method and fire method, but the more difficult part is that the total recovery rate of rare eart...

AI Technical Summary

Problems solved by technology

At present, the conventional smelting and extracting rare earth methods are divided into wet method and fire method, but the more difficult part is that the total recovery rate of rare earth in the process of rare earth separation and extraction is less than 20%, and a large amount of remaining rare earth is stored in rare earth tailings, resulting in a huge waste of resources , how to increase the recovery rate of rare earth rare earth is a huge technical problem in front of our country

At present, the commonly used process is weak magnetic-strong magnetic-flotation process to separate iron concentrate and rare earth concentrate. Although this process can obtain rare earth concentrate, the final recovery rate of rare earth is only about 10%. Such a separation process High rare earth recovery rate cannot be obtained, and the separation efficiency is also very low. In addition, the rare earth concentrate obtained by this process will also cause environmental pollution in the subsequent treatment process, causing huge waste to the utilization of rare earth resources

At present, some researchers are studying the smelting of iron-containing rare earth ores in direct reduction furnaces (such as rotary hearth furnaces). However, since their main purpose is to obtain iron, rare earths are only produced as by-products. Although the separation of the two is achieved, the Its processing parameters are mainly set for obtaining iron. Although rare earth-rich slag will be obtained, there are no specific parameters for the valence state of rare earth and other leaching properties. The obtained rare earth-rich slag still needs After some processing, the separation operation can be performed

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