جستجوی مقالات مرتبط با کلیدواژه « فلوتاسیون » در نشریات گروه « زمین شناسی »

Mineralogical and liberation studies are the most important parameters used in the selection of separation. An investigation was carried out toidentify the various types of minerals present in fluorite ore and to determine the suitability of the methods for its preconcentration and finalconcentration. The sample has been evaluated and characterized by ore microscopy, x ray diffraction, chemical analysis and also approximate mineralogy based on chemical analysis and Microscopic studies and also the texture characteristics such as grain size, Situation of infor lockedparticle and their arrangement in the ore body were also investigated. According to surveys conducted this ore contains of fluorite (40.52%), calcite (24%), quartz (20%), smitsonite (8%), galena (2%), clay minerals (3%), barite 1%) and goethite (0.6%). Carbonate phases is two parts sparry calcite, micrite to microsparate piece has been observed. Quartz, in the form of microcrystalline with limonite and goethite oxide of stained has been observed. The liberation degrees of crushed ore in different size fractions was estimated by the Counting method of showed that for fluorite (1000μm), Calcite (100μm) and quartz (90μm) of fluorite in size 100 mesh (150μm) with quartz (36%) and calcite (23%) were determined. The size fraction of -600, +425, can be assessed for gravity concentration as a preconcentration process and for the size fraction -150,+75 μm for flotation.

In this research the effect of bubble surface area flux on flotation rate constant of coal particles was investigated and the results showed that flotation rate constant increased with increasing bubble surface area flux. The obtained Maximum flotation rate constant was 3.30 /min while the particle size and bubble surface area flux were -37μm and 25.891/s, respectively. The bubble-particle collision, attachment and detachment efficiency were calculated in order to analyze the results. The obtained Maximum Stokes collision efficiency was 81.57% while the particle size, bubble surface area flux, and flotation rate constant were -500+420μm, 27.431/s, and 1.17/min, respectively. The obtained Maximum Yoon, Stokes and Potential efficiency were 94.66, 56.74 and 45.61%, respectively. Moreover, the obtained maximum detachment efficiency was 34.57% while the particle size, bubble surface area flux and flotation rate constant were -500+420μm, 16.771/s, and 0.85 /min. The collection efficiency increased with increasing of the bubble surface area flux. The collection efficiency was high for the particle size range of -106+37μm and for out of this particle size range it decreased steadily. So, the low efficiency of floating coarse particles can be attributed to the high efficiency of detachment while the low efficiency of floating of the fine particles was due to the low efficiency of collision.

Fluorine sample used in the study was supplied from Kamarposht (Savadkooh) Fluorine miner. First studies on KamarPosht fluorine particles is for concentrating and high grading and receive to metallurgical grade extent.a sample received from accumulation of blasting orebroken in mine with 100Kg weight that the 80 percent of materials are under 500 micron. On Fluorine samples also microscopic studies, freedom degree and flotation tests have been done. Results of petrograghy is shown associate minerals with fluorine include quartz, calcite, barite and dolmite which can cause some problems in fluorine processing. Because of this anionic collector of oleic acid is used on fluorine flotation tests. Also for reaching to concentration with proper grade, was been used from sodium silicate inorganic depressant as depression of silicate minerals and sodium carbonate for regulation of pulp PH and metal salt of aluminum sulfate for depression of calcite.Finally %35 grade fluorin of feed reached to % 61/4 grade and % 85/88 recover by using flotation tests, that is metallurgical grade extent and main scope of the studies.

Gara-aghaj deposit located 36km northwest of urumieh is one of the titanium-phosphorous resources in Iran. The previous exploration studies indicated that there is 102Mt phosphorous ore deposit with average grading of 2.3% P2O5. In this research, the mineralogical studies of collected representative samples were performed by XRD, XRF, optical microscopy and SEM equipped by EDX. These studies indicated that ilmenite, magnetite and apatite are the main valuable minerals. The gangue minerals consist of the silicate minerals such as pyroxene, olivine, plagioclase and some secondary minerals. Analysis of apatite by EDX showed the presence of fluor-apatite in the ore. From textural viewpoint, apatites is mainly interlocked with ilmenite, magnetite and some gangue minerals with 60 microns liberation degree but there are some inclusions of apatite inside ilmenite and magnetite. The heavy liquid separation tests indicated that the first type of apatites, with density of 3, is mainly concentrated in tailing of gravity separation methods. This type of apatites is recoverable by flotation method. So, apatite concentrate can be obtained as a by-product of ilmenite concentration process by gravity methods.

In this research, characterization studies of sedimentary phosphate rock from Zanjan Dalir area with respect to processing are investigated. According to mineralogical studies, phosphate ore (Collophane 28.13%), sedimentary mineral and the predominant constituents of the gangues were Calcite (43.53%), Quartz and Dolomite (4.65%). Main composition of phosphate rock were P2O5 (11.9% wt), CaO (36.36% wt), SiO2 (24.49% wt) and MgO (1.01% wt). Microscopic studies showed that apatite pletts had inclusions of Calcite and Quartz (about 15-70 microns). Content of inclusions was considerable. Mineralogy texture is very complicated. Liberation degree determined by grain counting (with optic microscope) and sink and float test methods. From The results of liberation degree studies can be inferred that in dimension about 140 microns about 96% of phosphate particles librated. In desliming step about 8.2% of total phosphate was removed. Optimum grinding time to reaching liberation of phosphate particles was obtained about 10 min and 30 second. Organic material determined by heating method (about 1.66% wt). Scanning electron microscopy studies showed that inclusions and organic materials existed. Specific gravity of phosphate particles and gangues difference was low. Based on the mentioned studies, effective method for processing of phosphate minerals from carbonate and silicate impurities is suggested flotation method.

An investigation on beneficiation of Lakhshak antimony ore was carried out using flotation methods. The grade of antimony in representative sample was 17.23%. The most important minerals were stibnite, quartz and pyrite and the degree of liberation of stibnite was found to be 700 micrometer. The raw material was divided into three size fractions and beneficiation of fine size fraction (-210+38 m) was floated. The grade of mentioned fraction was 20.50 %. Taguchi method was used in flotation tests and optimum conditions were determined as follows: CuSO4 (1700g/t) as an activator, potassium etyle xanthate (900 g/t) as a collector, MIBC as a frother, pulp density 22% and grain size -150+38 m. All the experiments were carried out at pH = 6.8. As a result the grade and recovery of antimony was obtained 38% (Sb) and 91% respectively.