Method for improving rare earth grade of mixed rare earth ore

Abstract

The invention discloses a method for improving the rare earth grade of a mixed rare earth ore. The method comprises the following steps that ore-grinding is conducted, specifically, the mixed rare earth ore is grinded to more than 98 % of -200 mesh; roughing is conducted, specifically, the mixed rare earth ore after ore-grinding is subjected to pulp mixing, then is added into a flotation tank, stirring is started for flotation, the concentration of roughing pulp is about 60-70 %, and the temperature of the ore pulp is more than 50 DEG C; an inhibitor and a collecting agent are sequentially added while stirring, the pH of the slurry is 8-10 during roughing, and products after roughing are roughing concentrates and roughing railings; and concentration is conducted, specifically, four times of concentration are included, and the products after concentration are high-grade rare earth concentrates. According to the method, the high-grade rare earth concentrates can be obtained, the method process is simple and effective, industrial organization production is facilitated, no pollution is achieved, the recovery rate of rare earth is high, and the dilemma that an existing mixed rare earthsmelting process cannot be completely improved due to the problem of raw materials is effectively solved.

Description

technical field [0001] The invention relates to the field of ore dressing, in particular to a method for increasing the grade of rare earth in mixed rare earth ore. Background technique [0002] The Baotou Baiyun Obo deposit is a large-scale deposit of iron, rare earth and niobium polymetallic symbiosis in sedimentary metamorphism and hydrothermal metasomatism. 71 kinds of elements and more than 170 kinds of minerals have been discovered. There are many types of ores, among which the reserves of rare earths rank first in the world. There are as many as 15 kinds, but mainly bastnaesite and monazite light rare earth mixed ore, the ratio is 7:3 or 6:4, accounting for about 80% of the country's rare earth reserves. The symbiotic relationship between useful minerals is close, and the embedded particle size is fine. The particle size of rare earth minerals is generally between 0.074 and 0.01mm. The composition of the mixed ore in Baotou is complex. The useful rare earth minerals ...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the above problems, the object of the present invention is to provide a method for improving the grade of rare earth in mixed rare earth ore, and high-grade rare earth concentrate can be obtained by using this method. The recovery rate is high, effectively solving the dilemma that the existing mixed rare earth smelting process cannot be completely improved due to raw material problems

Images