Purification technology of barite
With high quality, single type of barite ore depletion in our country at present the majority of barite ore grade is low, and other metal ore, non-metallic minerals closely associated, directly affect the value of use in the industry. As for the drilling mud weighting agent barite general fineness requirements above -0.056mm, density >4.2g/cm, grade >95%, soluble salt content 98%, CaO content of <0.36%, and must not contain Magnesium Oxide, lead and other harmful ingredients. For different purposes, the purity of barite barite whiteness, different content of impurities
With the continuous development of flotation purification using high grade barite ore dressing, to increase the low grade barite mine research and development efforts. Barite usually associated closely with the mineral fluorite, calcite and quartz, low grade, fine particle size distribution, complex composition, traditional gravity process is difficult to make it effective separation. Flotation can adapt to a variety of complex embedded type barite, and thus become the other main methods at the present stage of barite. The collector is the key to decide whether the effective separation of barite, common collector on the basis of adsorption can be divided into three types: the chemical adsorption of the anionic collector; the physical adsorption of the cationic collector collector; the collector somewhere between the sexes. According to barite and fluorite separation process can be divided into two kinds: one is to inhibit barite flotation fluorite; the other is to inhibit fluorite flotation barite. Yu Futao used sodium oleate as fluorite collector, YZ-4 extract cooperation with water glass and aluminium sulfate group inhibitor, inhibition of barite flotation of fluorite, eventually won the CaF2 grade of 96.81% and recovery of 92.44% and BaSO4 fluorite concentrate grade is 91.36%, the recovery rate is 86.75% of the barite concentrate, realize the efficient separation of fluorite and barite. Li Mingfeng with twelve sodium dodecyl sulfate as collector, sodium silicate and citric acid as inhibitor by inhibition of fluorite flotation fluorite, barite, finally BaSO4 grade is 93.28%, the recovery rate is 94.06% of the barite concentrate.
The physical purification methods of barite are mainly hand sorting, gravity separation and magnetic separation. The basis of hand selection is the difference of color and density between barite and associated ore. After crushing ore, barite minerals and gangue minerals can be effectively dissociated, hand selected can choose massive barite. Such as Guangxi Xiangzhou pan Cun mine, can get the size 30 ~ 150mm in the hand selection method, the content of BaSO4 >92% in china. The hand picking method is simple, convenient and easy to operate. It has low dependence on equipment and small cost, but requires high ore content and low production efficiency, which results in great waste of resources. Gravity separation is based on the density difference between barite and associated minerals.
