Beneficiation method for improving rare earth grade of rare earth ore

Abstract

The invention relates to a beneficiation method for improving rare earth grade of rare earth ore, and belongs to the technical field of beneficiation technologies. The method is a beneficiation method by using low-grade rare earth ore concentrate to prepare high-grade rare earth ore concentrate and is characterized in that: the low-grade rare earth ore concentrate of which rare earth ore (REO) grade is below 60 percent and which is widely used in conventional production is used as a raw material; a washing reagent removal process which is never used in the traditional rare earth beneficiationis adopted in a beneficiation technology; and the whole flotation process adopts a mode of closed cycle beneficiation, so middling ore cannot be produced, and the grade and the recovery rate of the ore concentrate are improved. The invention has the remarkable characteristics that: the high-grade rare earth ore concentrate of which the REO grade is more than or equal to 65 percent and the recovery rate is more than or equal to 95 percent are produced, and high-quality raw materials are provided for effective improvement of the traditional rare earth smelting technology.

Description

technical field [0001] The invention relates to a mineral processing method for preparing high-grade rare earth concentrate from low-grade rare earth concentrate, and belongs to the technical field of mineral processing technology. Background technique [0002] The rare earth concentrates used in Baotou rare earth concentrate smelting are basically low-grade concentrates, and the rare earth grades in the concentrates are generally around 50%. There are currently two main processes for processing this mixed rare earth concentrate, one is the concentrated sulfuric acid roasting method, and the other is the sodium hydroxide decomposition method. The concentrated sulfuric acid roasting process was applied to rare earth smelting as early as 30 years ago, which seemed to be an effective smelting method for extracting rare earths at that time. However, with the development of science and technology and the increasing emphasis on environmental protection, many shortcomings of this ...

AI Technical Summary

Problems solved by technology

However, it is difficult to prepare a qualified rare earth concentrate with a grade of more than 65% by using the original beneficiation process. Blending together with a simple sweep, recovery is naturally low when producing high grade rare earth concentrates

2. Due to the complexity of rare earth minerals, the requirements for flotation agents and flotation conditions are relatively high. When the accumulation of agents is serious and the hardness of the pulp water is high, the agents will fail and the flotation efficiency will not be achieved.

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