Latest progress in mineral processing of non-metallic ores

In many mineral processing research and production of non-metallic mineral resources, the fluorite sorting remained a priority in 2009. In addition, there are certain restrictions on the beneficiation of non-metallic minerals such as quartz , feldspar and andalusite .

Aiming at the characteristics of a typical quartz-type fluorite ore in Hebei, such as low grade, high oxidation degree and high mud content, and fine granularity of fluorite inlay, Dou Yuandong et al. based on the original production process, the first selected work of the first paragraph reached 99.95. % quartz powder; the concentrate is re-grinded to achieve a grinding fineness of 90%-0.038mm, which can fully dissociate fluorite and quartz, effectively avoid over-grinding, optimize the beneficiation environment, and be fluorite and quartz. The sorting provided favorable conditions, and the final concentrate CaF ₂ grade increased from 88.00% to 97.23%, and the recovery rate reached 70.56%.

Zhu Liangyou conducted an optional experimental study on a fluorite ore in Pengshui County, Chongqing. It was found that the use of a combination inhibitor (sodium hexametaside + SH) has a good effect on the separation of fluorite from barite and calcite , and plays a key role in obtaining qualified concentrates; mud, a roughing, scavenging twice, five times selected flotation process, with oleic acid as collector, NaC03 adjustment agent, sodium hexametaphosphate SH group of the phosphorus modifier cooperation obtained CaF ₂ Fluorite concentrate with a content of 99.12%, a recovery rate of 85.2%, a SiO ₂ content of 0.18%, and a CaCO ₂ content of 0.35%.

Gao Huimin et al. conducted a flotation test on a fine-grained fluorite ore in Inner Mongolia. By comparing three basic schemes of alkaline rough selection + weak acid selection, all-alkaline flotation and full weak acid flotation, it is found that the alkali acid combination process can obtain better concentrate index; using self-developed modified fatty acid Salt YSB-2 is a collector. At room temperature, 7 times of fine selection and fine I tailings are used as the final tailings under conditions of weak alkalinity (pH=9.0) under rough selection and weak acidity (pH=6.0). Discarded, the remaining middle mines were concentrated back to the alkaline acid process of Jing I, and the grade fluorite concentrate with CaF ₂ content of 98.70%, recovery of 89.20%, SiO ₂ content of 0.93% and CaCO ₃ content of less than 0.37% was obtained.

Xie Chunmei et al. used fluorite and barite in a fluorite ore in Guizhou to separate and float after separation. At pH = 8.5 to 9.0, oleic acid was used as a collector, and water glass was used as a crude selective inhibitor. Sodium metaphosphate and starch are selected combination inhibitors, and one pass rough selection, one sweep selection, and three selections are performed, which better realizes the mixed flotation and separation of fluorite and barite. Grade and recovery of fluorite concentrate.

On the basis of rock analysis of a quartz sand mine in Hainan, Dou Zhonglei et al. carried out a beneficiation and purification experiment using various methods such as screening, scrubbing, re-election and flotation. The sieving-scrubbing-de-fluiding-shaker-reverse flotation process was determined. The flotation was carried out in a neutral aqueous medium using a fluorine-free and acid-free flotation method, and finally the SiO ₂ content in the quartz sand was increased to 99.9. %,the above.

Ding Yazhuo et al. conducted a reverse flotation purification study on a feldspar quartz ore in Liaoning. The use of grinding, deliming, flotation, re-grinding, de-mudging, filtration, high-temperature drying of the purification process, with SiO ₂ grade 93.01% quartz ore as raw material, finally obtained a SiO ₂ grade of 99.95% Quartz powder; Scanning electron microscopy and energy spectrum analysis of flotation products found that eliminating the cover of fine-grained slime on the surface of quartz particles is an important measure for the flotation purification of quartz ore.