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Fan H.,Chongqing University | Duan H.,Chongqing University | Tan K.,Chongqing University | Li Y.,Institute of Multipurpose Utilization of Mineral Resources | And 3 more authors.
JOM | Year: 2017

A new process of producing synthetic rutile from molten titanium slag with the addition B2O3 is proposed. The process includes a molten modification process and a leaching process. The molten modification process was conducted by adding B2O3 into molten slag. The leaching process was conducted by adding hydrochloric acid and subsequent NaOH. The results show that CaO and MgO are leached out by hydrochloric acid and that synthetic rutile is further improved by NaOH. The optimized conditions are 2% B2O3 amount, 5% hydrochloric concentration, 80°C leaching temperature, and 30 min leaching time. The synthetic rutile with 86.77% TiO2 and 1.23% (CaO + MgO) was prepared. From x-ray diffraction results, thermodynamic calculation and the theory of bond parameter function, with the addition of B2O3, calcium silicate is transformed into calcium borate and anosovite is transformed into magnesium borate. Calcium borate and magnesium borate are leached out by hydrochloric acid, leading to the enrichment of rutile. © 2017 The Minerals, Metals & Materials Society

Lin C.,Sichuan University | Lin C.,Institute of Multipurpose Utilization of Mineral Resources | Mao L.,Sichuan University | Huang N.,Sichuan University | An Z.,Sichuan University
Plasma Science and Technology | Year: 2012

X-ray fluorescence (XRF) in combination with partial least-squares (PLS) regression was employed to analyze the ore slurry grade. Using the Monte Carlo simulation code PENELOPE, X-ray fluorescence spectra of ore samples were obtained. Good accuracy was achieved when this method was used to analyze elements with concentrations of several percent or above. It was demonstrated that the more the number of X-ray fluorescence spectra used to calibrate, the better the obtained accuracy. In this method detector resolution was found to have little or no effect on the results of quantitative analysis. The effect of the concentration of water was investigated as well, and it was found to have little influence on the results.

Li F.,Southwest Jiaotong University | Li F.,Chengdu Textile College | Liu F.-Y.,China Geological Survey | Lin C.-S.,Institute of Multipurpose Utilization of Mineral Resources
Hedianzixue Yu Tance Jishu/Nuclear Electronics and Detection Technology | Year: 2014

In this paper, by using the Monte Carlo method for producing mineral powder XRF spectra to test 30 samples of mineral grade, the results show that the method is capable for concentration values of several percent to tens of percent elements are tested. Various factors affect the analysis results have been discussed, results show that as the number of learning spectrum is more, and standard sample concentration range covers lager range, the testing results are more accurate and reliable. This method is fast for on-line testing of mineral grade. ©, 2014, Atomic Energy Press. All right reserved.

Xiao J.,Southwest University of Science and Technology | Xiao J.,Key Laboratory of Vanadium titanium Magnetite Comprehensive Utilization of Ministry of Land and Resources | Zhang Y.,Key Laboratory of Vanadium titanium Magnetite Comprehensive Utilization of Ministry of Land and Resources | Zhang Y.,Institute of Multipurpose Utilization of Mineral Resources | And 3 more authors.
Zhongguo Kuangye Daxue Xuebao/Journal of China University of Mining and Technology | Year: 2015

Higher proportion of harmful phosphorus of 1.17% was found in Chongqing Taohua oolitic hematite-limonite. 85.90% of the phosphorus distributed in hematite, and the rest were in the form of collophanite. A segregation roasting and low intensity magnetic separation technology was proposed to upgrade iron and remove phosphorus. Ores, chlorinating agent and reductant were mixed and put into roasting furnace to conduct segregation roasting. After being transferred from weak to strong magnetic mineral, the iron was recovered by low intensity magnetic separation from roasting ores. Study results indicated that during roasting, new ore phases dominated by magnetite (Fe3O4), metallic iron (Fe) and a few ferrous oxide (Fe) were generated, and effective separation of iron minerals as well as phosphorus minerals was achieved. The iron concentrate separation characterized by iron content of 71.65%, phosphorus content of 0.17%, iron recovery of 87.92% was obtained under roasting temperature of 950℃, dosage of coke of 20%, dosage of rejected salt of 45%, roasting time of 60 min, low-intensity magnetic field intensity of 0.12 T and 95% of grinding fineness less than 0.038 mm. The effect of upgrading iron and removing phosphorus was obvious. ©, 2015, China University of Mining and Technology. All right reserved.

Lu Y.,University of Sichuan | Lu Y.,Institute of Multipurpose Utilization of Mineral Resources | Wang J.,University of Sichuan | Yuan H.,University of Sichuan | Xiao D.,University of Sichuan
Analytical Methods | Year: 2014

Carbon quantum dots (CQDs) have attracted significant attention due to their low toxicity, biocompatibility and potential applications, particularly in the field of biomedical imaging. However, the major drawback limiting the application of CQDs is their relatively low quantum yield (QY). For further study and applications of CQDs, this class of carbon nanomaterials requires separation and purification. In this paper, we report a general method to separate CQDs obtained using resorcinol (m-C6H6O2) as the carbon precursor on a C18 column through high performance liquid chromatography (HPLC). The separation of CQDs was achieved by binary gradient elution using acetonitrile-water and acetonitrile-methanol as the mobile phases and acetonitrile plays an important role in the separation of CQDs. The resolution of some peaks improved when the flow rate was increased; however, the separation of certain other peaks worsened, almost disappearing at higher flow rates. The characterization of the collected fractions revealed that the oxygen-containing functional groups on the CQDs are crucial when separating the CQDs through this method. Our method is feasible and the collected purified CQDs have QY as high as 0.72. © the Partner Organisations 2014.

Lu F.,Chongqing University | Wen L.-Y.,Chongqing University | Wang H.-P.,Chongqing University | Liang H.-L.,Chongqing University | Li Y.-K.,Institute of Multipurpose Utilization of Mineral Resources
Guocheng Gongcheng Xuebao/The Chinese Journal of Process Engineering | Year: 2015

The interaction between gas and particles in a fluidized furnace was simulated using CFD software. The distribution of instantaneous particles concentration, change of velocity and orientation of particles with time, pressure drop with height at the center of bed, and radial concentration distribution of particles under various arc degrees of furnace bottom were investigated. The results showed that the gas from the center of flat bottom was stronger than that from the arc bottom, when the superficial velocity was 0.24 m/s. The center pressure dropped suddenly at the height of 300~400 mm, the inner loop in the region of reaction was reinforced, and the particles concentration was distributed equally when the arc degree of bottom was 60°, the portion of bubbles with the diameter less than 50 mm was higher and the number of bubbles was more than that under the arc degrees of 90° and 0°. The simulated results agreed with the experimental ones of photographs and parameter change curves of gas-particles flow. A better fluidization could be achieved under the arc degree of furnace bottom at 60°. ©, 2015, Science Press. All right reserved.

Fei G.-C.,Chengdu University of Technology | Wen C.-Q.,Chengdu University of Technology | Zhou X.,Chengdu University of Technology | Zhou X.,Institute of Multipurpose Utilization of Mineral Resources | And 2 more authors.
Kuangwu Yanshi/ Journal of Mineralogy and Petrology | Year: 2010

Dongzhongla ore deposit is located in the Zhaxue-Yaguila mineralization area, Nyainqentanglha Range, Tibet and is a new founded middle-large size lead-zinc deposit. The host quartz veins in the Dongzhong lead-zinc deposit was measured by laser microprobe 40Ar-39Ar dating method in order to obtain the ore-forming age. As a result, the isochron age of the ore is 42. 2 Ma ±1. 7 Ma, inverse isochron age is 42 Ma±3 Ma with the MSWD value of 2. 4 and the initial 40Ar/36 Ar value of 303. 6±1.4. The measured age is in agreement with-the inverse isochron age within a reasonable error range, and the dating results can be regarded as the ore-forming age of the Dongzhong lead-zinc deposit (formed during early Eocene). In the same mineralization zone, the Sharang porphyry molybdenum deposit has a Re-Os isochrone age of 51 Ma ±1.0 Ma,and the Yaguila lead-zinc-molybdenum polymetallic deposit yields a Re-Os weighted average model age of 58.7 Ma ±8. 5 Ma. All the geochronology information indicated that the mineralization movements occurred during main Indian-Asian collision period (41 Ma∼65 Ma) in the Nyainqentanglha mineralization belt. This study provided important evidence for the research and exploration of lead-zinc molybdenum-copper polymetallic ore deposits in the Nyainqentanglha Range.

Xu S.,Chongqing University | Long M.,Chongqing University | Li Y.,Institute of Multipurpose Utilization of Mineral Resources | Chen D.,Chongqing University | And 3 more authors.
Metalurgia International | Year: 2013

The extraction of vanadium from a high Ca/V ratio vanadium was studied by direct roasting and water leaching. In the present paper, the effects of Na2CO3 amount, roasting temperature and roasting time on the extraction of vanadium were studied. Results showed that the Na2CO3 amount and roasting temperature are the main factors in roasting process affecting the final leaching rate of vanadium. As indicated in the experimental study, the optimal Na2CO3 amount is 19%, the roasting temperature is 800°C, and the roasting time is 90 min respectively. By the mean of TG-DSC analysis and X-Ray diffraction(XRD) techniques, the oxidation process and material phase transformation of vanadium slag during roasting process under the optimal roasting conditions were analyzed and discussed.

Diao J.,Chongqing University | Qiao Y.,Chongqing University | Zhang X.,Chongqing University | Ji C.-Q.,Institute of Multipurpose Utilization of Mineral Resources | Xie B.,Chongqing University
CrystEngComm | Year: 2015

This paper investigated the growth of spinel crystals in vanadium slag under different heat treatment conditions. The growth mechanism was clarified by SEM + EDS and statistical analyses based on the CSD theory. The results showed that all CSDs follow lognormal distributions. Long holding time and low holding temperature below 1300°C benefit the growth of spinel crystals. We proposed that the growth mechanisms of the spinel crystals consist of two regimes: in the first regime, nucleation control with a decaying rate within the temperature range of 1400 to 1250°C; in the second regime, surface control when the temperature is below 1250°C. The mean crystal diameter changes from 16.6 to 26.2 μm with an increase in holding time at 1250°C. The relationship between the mean diameter of the spinel crystals and the holding time in the present study can be best described by the equation D = 16.32t0.11. © The Royal Society of Chemistry 2015.

Institute Of Multipurpose Utilization Of Mineral Resources | Date: 2015-01-08

The present invention discloses a monazite and apatite paragenetic ore enrichment method. High-grade and high-recovery-rate monazite concentrate can be obtained by adopting the method through steps of ore grinding, floatation, magnetic separation and low-acid advanced leaching treatment and re-floatation. In this process, the applicable range of ore pulp temperature is wide, the process flow is short, the ore dressing conditions are mild, the energy consumption is small, the used diluted acid can be cyclically regenerated and used, the pollution is small, the environmental stress is small and the recovery rate of low-grade monazite and apatite paragenetic ores can be obviously improved.

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