Hubei province geological experimental testing center

Wuhan, China

Hubei province geological experimental testing center

Wuhan, China
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Qiu X.,Wuhan University | Qiu X.,Hubei Province Geological Experimental Testing Center | Liu Y.,Hubei Urban Construction Vocation and Technological College | Alshameri A.,Wuhan University | And 2 more authors.
Journal Wuhan University of Technology, Materials Science Edition | Year: 2017

Good fluidity (low viscosity) of highly concentrated kaolin is highly needed in paper-coating industry. We put forward an effective route to improve the viscosity concentration of Beihai kaolin slurries. The effects of various factors such as solid content, pH, dispersant content, and urea-intercalation on the viscosity of kaolin slurries were investigated. The results revealed that the viscosity of kaolin slurries significantly decreased with decreasing solid content or with increasing pH and dispersant content. It was worth noting that urea-intercalation was proven to be an efficient method for promoting the dispersion of highly concentrated kaolin as compared with adding dispersant. The intercalation ratio of urea-intercalated kaolin was increased from 17.36% with 2% of urea addition to 81.30% with 6% of urea addition. Meanwhile, the viscosity concentration of raw kaolin slurry was improved from 65.0% to 70.13% after the intercalation of urea with 6% addition, which was attributed to finer particle size, increased pH value and more negative charges of urea-intercalated kaolin. Therefore, the route is effective to improve the dispersion of highly concentrated kaolin for paper-coating. © 2017, Wuhan University of Technology and Springer-Verlag Berlin Heidelberg.


Liu Y.,Wuhan University | Liu Y.,University of Southern Queensland | Yan C.,Wuhan University | Zhang Z.,University of Southern Queensland | And 3 more authors.
Materials Letters | Year: 2016

We present a process of fabricating water floatable and permeable geopolymer block from industrial by-product fly ash. By adding oleic acid and H2O2 solution during the geopolymer manufacture process, a foamed geopolymer block with highly interconnected pores can be manufactured. The compressive strength of those foamed geopolymer block are 0.55±0.08 MPa at dry density of 0.37 g/cm3, and its permeability to water coefficient is 0.35 cm/s and the BET surface area is 67.62 m2/g. In addition, the porous geopolymer block possesses a high adsorption capacity for methylene blue, 50.7±0.7 mg/g, and shows the potential of being employed as low cost replacement for zeolites in applications such as waste water treatment at high mass transport rate. © 2016 Elsevier B.V.


Liu Y.,Wuhan University | Yan C.,Wuhan University | Qiu X.,Wuhan University | Qiu X.,Hubei province geological experimental testing center | And 3 more authors.
Journal of the Taiwan Institute of Chemical Engineers | Year: 2015

In this study, a faujasite block with certain compressive strength was successfully fabricated from fly ash based geopolymer via in-situ hydrothermal method. The effects of various factors, such as the SiO2/Al2O3 molar ratio of the geopolymer, the concentration of NaOH, crystallization time and crystallization temperature of the hydrothermal curing solution on the structure and morphology of the hydrothermal products were investigated. SEM and XRD results confirmed that these factors played essential roles in controlling the morphology and crystallinity of the hydrothermal products. The optimum faujasite block showed an octahedral shape and sharp edges with good crystallinity. In addition, the BET specific surface area, the total pore volume and the compressive strength of the faujasite block were 136.23m2/g, 0.14cm3/g and 5.14MPa, respectively. The optimum conditions for the synthesis of faujasite block were SiO2/Al2O3 molar ratio of 4.0, NaOH solution concentration of 1.0mol/L, and 24h for crystallization at 70°C. © 2015 Taiwan Institute of Chemical Engineers.


Lu L.,Hubei Province Geological Experimental Testing Center | Liu S.,Hubei Province Geological Experimental Testing Center | Ran X.,Hubei Province Geological Experimental Testing Center | Wei J.,Hubei Province Geological Experimental Testing Center | Wang F.,Hubei Province Geological Experimental Testing Center
Xiyou Jinshu/Chinese Journal of Rare Metals | Year: 2015

The deposits of sovite-alvikite type are rich in niobium-rare earth in Hubei province, but its complicated composition makes it hard to be beneficiated and smelted, so the niobium-rare earth deposits have not been exploited and utilized in a large scale for a long time. By polarized microscopy, chemical analysis, electron microprobe and X-ray diffraction (XRD) analysis and other tests, niobium minerals and accompany minerals category and content of samples were studied, including chemical compositions, structure construction, embedded characteristics and modes of occurrence of niobium minerals. The niobite minerals was finely disseminated, niobite particles size mainly ranged from 0.02 to 0.03 mm and ilmenorutile particles size mainly ranged from 0.01 to 0.02 mm. Niobite minerals were of complicated occurrence relationship, difficult dissociation in the ore and main symbiosis with calcite, biotite, apatite, ilmenite, pyrite. The niobium element had two existing forms, about 77.76% were liberated, mainly existed in niobite and ilmenorutile, but 22.24% of niobium minerals were of scattered distribution as isomorphism or microscopic inclusions. Based on the ore characteristics, the recycling of niobium minerals could be realized by magnetic separation, gravity separation, flotation and chemical processing. ©, 2015, Editorial Office of Chinese Journal of Rare Metals. All right reserved.


Dong X.-L.,Hubei Province Geological Experimental Testing Center | Dong X.-L.,Key Laboratory of Rare Mineral Experimental Technology | Jia Z.-X.,Hubei Province Geological Experimental Testing Center | Wang H.-P.,Hubei Province Geological Experimental Testing Center | And 4 more authors.
Yejin Fenxi/Metallurgical Analysis | Year: 2016

If selenium and tellurium in the polymetallic ore sample was determined directly after decomposition without effective pretreatment, the determination results would be inaccurate and the instrument would be contaminated because of the complicated matrix and the low abundance of selenium and tellurium in nature. The polymetallic ore sample was decomposed by nitric acid-hydrofluoric acid-perchloric acid. Arsenic, selenium and tellurium in the sample solution was reduced to simple substance by sodium hypophosphite with copper salt as contact agent medium in hydrochloric acid. The coprecipitation of selenium and tellurium with arsenic realized the separation of selenium and tellurium from other elements, eliminating the matrix effect. Finally, the precipitate was dissolved with hot nitric acid and determined by inductively coupled plasma mass spectrometry (ICP-MS). Thus, a determination method of selenium and tellurium in polymetallic ore was established. The results showed that the matrix effect, the fluctuation and drift of instrument signal could be corrected with cesium (133Cs) as internal standard. The correlation coefficients of calibration curves were both up to 0.999. The detection limit for selenium and tellurium was 0.004 and 0.003 ng/mL, respectively. The proposed method was applied to determination of polymetallic ore actual samples. The results were basically consistent with those obtained by hydride generation-atomic fluorescence spectrometry (HG-AFS). The proposed method was applied to determination of polymetallic ore certified reference material. The results were in good agreement with the certified values. The relative standard deviation (RSD, n=7) for selenium and tellurium was 1.2%-8.5% and 1.1%-6.2%, respectively. © 2016, CISRI Boyuan Publishing Co., Ltd. All right reserved.

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