Wollastonite beneficiation technology

Wollastonite beneficiation technology : China has discovered wollastonite ore with commercial value in more than a dozen provinces (districts), and has built ore for sale, mainly for hand selection, but the theory and application of ore dressing research is relatively active.

1 Mao Yufan et al. used flotation, ε-potential measurement and XPS spectroscopy to study the floatability of wollastonite and separation from calcite , pointing out that the wollastonite surface is mainly Si and O, while Ca is concealed inside the mineral. , pure wollastonite can not be anionic collector flotation, after the metal ion to be activated in order to float.

2 Fanghe Equality has conducted in-depth research on the beneficiation and purification of skarn-type wollastonite ore rich in garnet , diopside and quartz . For the wollastonite ore with a crude ore grade of 57% to 60% and a Fe ₂ O ₃ content of more than 2%, a single flotation process is adopted, and the continuous ore test in the laboratory is successful, and the wollastonite concentrate grade can reach 90%. The Fe ₂ O ₃ content is less than 0.25%, and the ore recovery rate is 70%.

3 Yuan Jizu et al reported the theoretical study on the flotation separation of wollastonite and diopside. The use of dodecylamine hydrochloride as a collector and tannic acid as an inhibitor can effectively float wollastonite. Zhang Shouxiang et al studied the difference between flotation properties of wollastonite and quartz, and pointed out that in a weakly acidic medium, the combination of dodecylamine and sodium oleate can enhance the ability to capture quartz and improve the selectivity of the flotation process.

4 Fang Heping, Xu Xiaojun and others studied the surface chemistry of wollastonite and quartz, and studied the flotation characteristics of these two minerals when using dodecylamine as a collector. The test shows:

a. Wollastonite and quartz have similar surface chemistry, surface zeta potential is negative, and lack of metal ions, making these two minerals easy to float with amine collectors. 

b. Sulfuric acid as an inhibitor with dodecylamine as a collector can effectively separate wollastonite and quartz. The recovery and grade of both minerals are above 95%.

c. In the weakly acidic medium, the obvious difference in the adsorption and adsorption strength of dodecylamine on the surface of quartz and wollastonite, and the dissolution of sulfuric acid on the surface of silica are the key to the effective separation of quartz and wollastonite.

d. Wollastonite and diopside have similar crystal structure. Foreign countries generally choose magnetic separation method, but Wuhan University of Technology Cao Mingli, Yuan Jizu, Yuan Chuxiong use cationic collector dodecylamine hydrochloride and tannic acid as inhibitors. Successfully realized the flotation separation of wollastonite and diopside.

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