Effects of the Grinding Time on Selective Grinding Five grinding tests were conducted in a cone ball mill under conditions as follows the grinding concentration was set at 60% the filling ratio
Te major bauxite resources in China are characterized by a high content of alumina >55% Al 2 O 3 high silica content 5% 15% SiO 2 and a low mass ratio of Al 2 O 3 to SiO 2 A/S
In addition grinding kinetic models were applied to the experimental data in order to identify if the linear theory of the population balance model is valid during bauxite grinding
Most bauxite in China is diasporic and contains higher alumina as well as silica The ratio of Al 2O 3/SiO 2 of most of them is within 4～7 unfit to produce alumina by Bayer process directly A concentrate with A/S over 7～12 can be obtained by the new process of elective crashing and grinding from bauxite with middle low grade The advantages of the new process are simple
As suggested from the upgrade of alumina from low grade bauxite the effect of selective grinding can be evaluated by the upgrade of the soft mineral in the fine grinding product underscreen or −38 μm Yin et al 2004 For SG nickel laterite quartz represents the hard mineral and antigorite represents the soft mineral
Role of indigenous microbes in the formation and conversion of bauxite minerals is illustrated Many types of microorganisms such as fungi heterotrophic and autotrophic bacteria and yeasts inhabit bauxite ore deposits bringing about biogenesis and biomineraliztion Organisms capable of iron oxidation and reduction and solubilising calcium carbonate and
This paper introduces the survey of bauxite resources in China analyses the basal principle of selective dissociation then details dissociation process flow and selective grinding finally
MORE The selective grinding test of bauxite with aluminum to silicon ratio was conducted to investigate the influences of medium ratio shape and filling ratio on selective grinding of bauxite The resuits showed that medium ratio grinding medium with different shapes and medium filling ratio had certain effects on size compositions of grinding products and aluminum to silicon ratio
Other studies have attempted to upgrade bauxite ores through selective grinding by exploiting the different grindability between the minerals of interest diaspore 7 Mohs hardness and
Based on particle size analysis for grinding products silicates are predominantly present in the fine size fraction but diaspore is distributed in relatively coarse size fraction Recent studies have demonstrated the feasibility of using selective flocculation to pre de silicate bauxite Wang et al 2007 Wang et al 2008 Zhang et al 2003
Grinding as an important preparation step for beneficiation is very necessary to study for the finely disseminated extent vanadium bearing stone coal with complex chemical composition In this paper grinding medium time degree and monomer dissociation degree were investigated in detail The results show that the efficiency of rod milling is better than that of ball
Features of selective grinding of bauxite in ball mill Application of prediction control algorithm in grin ding grade Automatic control on the g1inding classification system of ball mill
The Bayer process is a chemical process for refining aluminium hydroxide Al OH 3 from bauxite; this aluminium hydroxide is subsequently calcined to produce alumina Al 2 O basis of the Bayer process is an understanding of the characteristics of the sodium hydroxide—sodium aluminate solution relationship namely its ability to keep sodium aluminate in a dissolved state
In this study sedimentation tests for individual minerals and artificially mixed minerals and bauxite ores were carried out to understand the effects of sodium tripolyphosphate STPP on the
Other studies have attempted to upgrade bauxite ores through selective grinding by exploiting the different grindability between the minerals of interest diaspore 7 Mohs hardness and
The latter process can be ascribed to the loss of the OH − groups in the reaction from goethite to hematite Figure 5a This reaction 2FeOOH → Fe 2 O 3 H 2 O occurs at temperatures
To enhance the efficiency of selective extraction of Li a combined process of grinding thermal activation was proposed and the influence of grinding time on Li leaching was discussed The coordination environment of Li in CG was studied from the atomic scale through the correlation analysis of Li and bivalent cation during leaching
According to Table 1 the main chemical composition of low grade bauxite were Al 2 O 3 SiO 2 Fe 2 O 3 and TiO 2 in addition to a small amount of CaO MgO K 2 O and Na 2 O It should be noted that Al 2 O 3 and SiO 2 were the most important components and the contents were % and % respectively The A/S of the sample was which was difficult to
tive grinding of bauxite was studied for the development and utilization of low grade bauxite including the influences of the mill type media and grinding agent Ball mill is commonly applied to grind minerals by using steel balls to crush material When the steel Citation Yang J ; Xu W ; Deng X ; Selective Grinding of Zn and Sn in
Bauxite is the most important mineral resource to produce Aluminum metal by mineral processing and metallurgical industry which mainly includes diaspore gibbsite boehmite et al [1] [2] However an approximate 98% of the bauxite ores in China are diasporic characterized which show the characteristics of high contents of aluminum and silica low Al/Si
It is feasible to carry out selective grinding for the typical diaspore type bauxite of China because of its characteristic Firstly diaspore with hardness of 7 is the main aluminum bearing minerals in the bauxite while the main silicon bearing minerals are kaolinite illite pyrophyllite etc whose hardness is smaller than 3 normally
The effects of the ball shape the short cylindrical and the mxied grinding media on selective grinding of bauxite were studied respectively The results show that the coarse particles are overgrind due to the powerful impact of big ball abrasive particles The mass ratio of Al 2O 3 to SiO 2 in coarse particles is increased by the abrasive effect of small ball shape medium
During acid leaching of bauxite residue red mud the increase in dissolution of rare earth elements REEs is associated with an increase in iron dissolution which poses problems in the downstream processing Therefore it would be beneficial to remove iron from bauxite residue by smelting reduction The slag generated in the smelting reduction process
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