magnetic separation equipment
PTMS MAGNETIC SEPARATOR
what is magnetic separation in Kaolin？
Compared with single fluorocarbon strontium ore at home and abroad, due to the similar physical and chemical properties of minerals and the close relationship between rare earth minerals and iron minerals and gangue minerals. Since the late 1950s, many research institutions in China have carried out a large number of experimental studies on the rational exploitation of rare earth deposits, and reported more than 20 kinds of mineral processing techniques. In the early 1990s, the rare earth beneficiation process made significant progress, and high-grade, high-recovery rare earth concentrates were obtained from iron ore. These flow charts have been developed: calcination - magnetic separation - flotation, flotation - low magnetic separation, low magnetic flotation - high magnetic separation and low magnetic - high magnetic flotation separation processes. Among them, low-intensity magnetic separation - high-intensity magnetic separation - flotation.
After being crushed, the ore is ground to 90-95% and passed through 0.074 mm. Through (rougher and cleaner stages) magnetite is recovered in the concentrate. The tailings are treated by roughing at a magnetic field strength of 1.4 T to recover another iron mineral, hematite and most rare earth minerals. The hematite and rare earth minerals contained in the coarsely selected concentrate are separated by the cleaning agent at a magnetic field strength of 0.6T.
In the rare earth flotation circuit, the REO feed grade is 9.78-12%. Flotation is carried out under low basic conditions (pH 9), the flotation reagent contains naphthyl hydroxamic acid as a collector for rare earth minerals, sodium silicate as an inhibitor of silicate, and J 10 as a foaming agent. The percentage of solids fed is 35-45 wt%. Under a coarse flotation plus a scavenger and two detergents, the first rare earth concentrate has a grade of REO 55 wt% and the second rare earth grade has a REO 34 production weight percentage of 72-75%. Composite recovery rate. These concentrates are a mixture of rare earth minerals, mainly bastnasite and monazite. The separation of bastnasite and monazite is carried out by further flotation using phthalic acid or benzoic acid as a fluorocarbon antimony ore and alum as a collector of monazite inhibitors.
Different flotation reagents were tested. Previously, only fatty acids (such as oxidized paraffin and oleic acid) were used as collectors to obtain rare earth concentrates with REO grades as low as 15-20% and low recovery. Ç 5 to 9 by saponification of hydroxamic acid is mainly used for flotation of rare earth minerals in the 1970s and 1980s; then, synthesis of cyclic alkyl hydroxamic acid by naphthenic acid is used as a collector because of fatty acid C The shortage of synthetic materials is 5 to 9. The miracle grade of FSO 60% by weight flotation concentrate is obtained by processing REO 25-30 grade re-concentration concentrates. When a compatibility inhibitor is used, it is % by weight. In 1976, the factory was successfully tested and commercial production began in 1978. Thereafter, commercial high-grade rare earth concentrates (REO > 60 wt%) and high flotation recovery (60-65%) were obtained by using the reagent system (Luo et al., 2002; Li et al., 2007).
In 1986, naphthalene was prepared from naphthalene as a raw material by sulfonation hydrolysis-alkali metal hydroxide reaction, followed by acylation reaction and hydroxylamine condensation system. A more selective collector H205 was successfully developed as aromatic Representative of hydroxamic acid. -NH-OH) to prepare naphthyl isobutyl hydroxamic acid. In the presence of NaSiO 3 , the use of a new generation of rare earth mineral collector H205 can significantly improve the rare earth grade and recovery. After the 1990s, a hydroxamic acid with a double activating group, a flotation oil No. 8, was modified from H205 and used as a collector in the Bayan Obo Rare Earth Processing Plant (Cao et al., 2013). By the end of 2012, Bayan Aobo rare earth flotation concentrate has been developed into an annual output of 250,000 tons of rare earth concentrates with a grade of 50%.
