Study on Manufacture of Short Mullite Fibers by Andalusite Mineral of Mei County China

The short mullite fibers were manufactured by andalusite mineral raw materials of Mei County China through isothermal sintering process between 1350°C and 1550°C under the oxidation atmosphere. And then the process which andalusite mineral raw materials of Mei County China had transformed into short mullite fibers was analyzed by X-ray automatic powder diffractometer D/MAX-2400, and the property of morphology of short mullite fibers was observed by scanning electronic microscope QUNATA200. The result manifests that in the range of experimental temperature, andalusite mineral raw materials of Mei County China fully transforms into mullite phase after the specimen is kept warm for 3 hours under sintered temperature 1450°C, and the mullite phases which are transformed at sintered temperature 1450°C mostly present in the form of short fiber while the temperature naturally cools to room temperature with furnace, and this kind of short mullite fiber has the best crystallinity, and the least structural defect and the highest length to diameter ratio.

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Solvothermal Synthesis and Luminescence Properties of Gd2O2S:RE3+ (RE3+=Eu3+/Tb3+) Hollow Sphere

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.807.1 ◽

2019 ◽

Vol 807 ◽

pp. 1-10 ◽

Cited By ~ 1

Author(s):

Guang Xi Xu ◽

Xiao Tong Sang ◽

Jing Bao Lian ◽

Nian Chu Wu ◽

Xue Zhang

Keyword(s):

Solvothermal Synthesis ◽

Solvothermal Method ◽

Raw Materials ◽

Hollow Spheres ◽

Hollow Structure ◽

Molar Ratio ◽

Detailed Characterization ◽

X Ray ◽

Electronic Microscope

Eu3+ and Tb3+ ions singly activated Gd2O2S hollow spheres have been successfully synthesized via solvothermal method by using Gd (NO3)3, Eu (NO3)3, Tb (NO3)3 and thiourea as raw materials. Detailed characterization of the as-prepared samples were obtained by X-ray diffractometry (XRD), field emission scanning electron microscopy (FE-SEM), transmission electronic microscope (TEM) and photoluminescence (PL) spectroscopy. The results demonstrate that at 220 oC for 24 h, the molar ratio of thiourea/Gd3+ has no significant impact on the phase composition of Gd2O2S products. With the reaction time increased from 6 h to 24 h, the morphology of Gd2O2S samples changed from ellipsoidal to near-spheroidal structure, but still remained hollow structure. PL results show that the strongest emission peaks for Gd2O2S:Eu3+ and Gd2O2S:Tb3+ samples were centered at 625 nm and 545 nm, corresponding to the 5D0→7F2 transition of Eu3+ ions and 5D4→7F5 transition of Tb3+ ions, respectively. The quenching concentrations for Eu3+ and Tb3+ ions were 12% and 6%, which can be attributed to the exchange interaction for Eu3+ and Tb3+ ions, respectively.

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Microstructural Analysis of Clay Ceramic Added with Argillite and Grog

Materials Science Forum ◽

10.4028/www.scientific.net/msf.798-799.219 ◽

2014 ◽

Vol 798-799 ◽

pp. 219-223 ◽

Cited By ~ 3

Author(s):

Veronica Scarpini Candido ◽

Regina Maria Pinheiro ◽

Sergio Neves Monteiro ◽

Carlos Maurício Fontes Vieira

Keyword(s):

Raw Materials ◽

Microstructural Analysis ◽

Sem Analysis ◽

Sintering Process ◽

X Ray Diffraction ◽

Ceramic Structure ◽

X Ray ◽

Initial Space ◽

Ceramic Sintering ◽

Sintering Conditions

The microstructure of a 1050oC fired clay ceramic added with both argillite and discarded ceramic waste, known as grog, was analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM). The objective was to evaluate not only the developed crystallographic phases but also the ceramic sintering conditions associated with the grog and argillite additions. The XRD results showed the presence of quartz and feldspar existing in the raw materials as well as hematite and mullite transformed at high temperature from the precursor clays. The SEM analysis revealed a consolidated ceramic structure in which the sintering process was effective in reducing the initial space between particles and thus improving the structural compactness.

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Addition of sedimentary rock to kaolinitic clays: influence on sintering process

Cerâmica ◽

10.1590/s0366-69132013000100017 ◽

2013 ◽

Vol 59 (349) ◽

pp. 147-155 ◽

Cited By ~ 11

Author(s):

A. E. Souza ◽

S. R. Teixeira ◽

G. T. A. Santos ◽

E. Longo

Keyword(s):

Sedimentary Rock ◽

Sintered Material ◽

Physical And Mechanical Properties ◽

Ceramic Materials ◽

Clay Material ◽

Sintering Process ◽

X Ray Diffraction ◽

X Ray ◽

Mullite Phase ◽

Heating And Cooling

The physical and mechanical properties of clay-based ceramic probes with sedimentary rock added as the non-plastic component were evaluated. Samples were prepared with 0, 20, 40, 60 and 80 wt.% of rock added to the clay material. Pressed (7 ton) probes were sintered at 500, 800, 900, 1000, 1100 and 1200 °C and submitted to X-ray diffraction analysis and technological characterization. The X-ray diffraction results showed that the sedimentary rock had micaceous clay minerals, while the clay material had kaolinite as the main phases. Thermal analysis and X-ray diffraction showed reactions that indicated transformation (inversion of quartz), decomposition (loss of hydroxides) and phase formation (mullite) during heat treatment of the samples. The technological tests showed that the addition of sedimentary rock improved some properties of the sintered material, aided by the presence of fluxes. However, the presence of quartz in the rock hampered the formation of the mullite phase. The formation of new phases and transformations occurring during the heating and cooling of the samples helped explain the technological properties of ceramic materials.

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Preparation of Cordierite–Mullite Composite Crucibles and Structure Characterization

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.430-432.521 ◽

2012 ◽

Vol 430-432 ◽

pp. 521-524

Author(s):

Feng Feng Li ◽

Jiao Du ◽

Ming Xi Zhang ◽

Wei Chao Yang ◽

Yi Shen

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Raw Materials ◽

Sintered Sample ◽

Structure Characterization ◽

X Ray Diffraction ◽

X Ray ◽

State Process ◽

Sintered Temperature ◽

Scanning Electron

Cordierite–mullite composite crucibles were prepared via high-temperature solid-state process by using burn talc, datong soil, knar clay, bentonite, quartz, feldspar and alumina as raw materials, waste porcelain powder as skeletal material. The main influencing factors such as the raw materials radio and calcination temperature were discussed. The microstructure of the sintered sample was analyzed with X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The results show that the optimal prescription was sample II (13.34 wt% of burn talc, 10.496wt% datong soil, 40.65% knar clay, 15.00wt% waste porcelain powder,10.34wt% bentonite, 2.17wt% feldspar, 1.61wt% quartz, and 6.394wt% of alumina). The optimal sintered temperature was 1380°C and the holding time was 3 hours.

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Minerālo izejvielu pielietošanas un stikla šķiedras defektu izpēte

Material Science and Applied Chemistry ◽

10.7250/msac-2018-0007 ◽

2018 ◽

Vol 35 ◽

pp. 160-177

Author(s):

Janīna Sētiņa ◽

Gundars Mežinskis ◽

Vasilijs Akišins ◽

Laila Pētersone ◽

Inna Juhņeviča ◽

...

Keyword(s):

Glass Fibre ◽

Quartz Sand ◽

Raw Materials ◽

Glass Melts ◽

Mineral Raw Materials ◽

X Ray ◽

Experimental Glass ◽

Fibre Breakage ◽

Different Types ◽

Silicate Materials

Pētītas iespējas izmantot jaunas izejvielas stikla šķiedras ražošanā, īpašu uzmanību pievēršot Latvijas minerālām izejvielām – devona (Bāles atradne) un juras perioda (Skudras atradne un Pīlādžu atradne) kvarca smiltīm. Apstrādājot ūdenī Skudras atradnes kvarca smiltis, krāsojošo oksīdu daudzums samazināts līdz 0,066 %. Iegūto stiklu īpašību pārbaude parādīja attīrīto Skudru atradnes kvarca smilšu izmantošanas perspektīvu E-tipa stikla šķiedras ražošanā. Veikta arī citu šihtas izejvielu izpēte: kolemanīta, kianīta, kaļķakmens.Pielietojot augstas izšķiršanas spējas skenējošo elektronu mikroskopu, diagnosticēti stikla šķiedras defektu rašanās iemesli un izzināta to novēršanas iespēja.Study of Mineral Raw Materials and Defects in Glass FibresLatvian Devonian period sand from deposit Bāle and Jurassic period sand from deposit Skudra were studied, treated and compared with sand from existing Lithuanian supplier. Investigations of Latvian quartz sand showed that sand is characterized by surface impurities, which are easy to separate combining milling and water purification. These investigations and experimental glass melts using different types of sand confirmed that it is possible to use Latvian refined sand in glass industry.Other glass raw materials – colemanite, kyanite, kaolin, limestone – also have been examined.Glass fibre breakage points were studied using SEM, FTIR and X-Ray diffractions methods. Main reasons of glass fibre breakage are non-homogeneous glass and crystalline or gaseous inclusions coming from corrosion of refractory material. This article is result of the cooperation between Institute of Silicate Materials of Riga Technical University and JSC Valmieras stikla šķiedra.Keywords – glass, glass fibre, raw materials for glass, refined sand, glass defects

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Effect of nanotegnogenic high-alumina raw materials on the physical and mechanical parameters and phase composition of acid-resistant materials

NOVYE OGNEUPORY (NEW REFRACTORIES) ◽

10.17073/1683-4518-2021-8-53-60 ◽

2021 ◽

pp. 53-60

Author(s):

E. S. Abdrakhimova ◽

V. Z. Abdrakhimov

Keyword(s):

Raw Materials ◽

Physical And Mechanical Properties ◽

High Alumina ◽

Kaolin Clay ◽

Sintering Process ◽

X Ray ◽

High Chemical Resistance ◽

Process Studies ◽

Ir Spectroscopic ◽

Unenriched Kaolin

The use of nanotechnogenic high-alumina (Al2O3 > 70 %) raw materials of petrochemical production ― the spent IM2201 catalyst in the production of acid-resistant materials based on unenriched kaolin clay makes it possible to obtain products with high physical, mechanical and chemical parameters in the range of firing temperatures of 1250‒1300 o C. Nanotechnogenic raw materials contribute to an increase in surface energy, which is the source of the sintering process. Studies have shown that in compositions based on unenriched kaolin clay and chamotte from it, which do not contain nanotechnogenic high-alumina raw materials, mainly mullite is formed, which mainly forms the operational properties of ceramic products. X-ray diffractometric analysis showed that the introduction of nanotechnogenic high-alumina raw materials into the compositions of ceramic masses contributes to the formation of corundum. IR spectroscopic analysis confirmed the data of X-ray studies. Corundum is characterized by high chemical resistance to acidic and alkaline reagents and gives acid-resistant materials high physical and mechanical properties. Ill. 4. Ref. 33. Tab. 5.

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Preparation Cordierite-Mullite Composites with Iron Tailing

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.393-395.902 ◽

2011 ◽

Vol 393-395 ◽

pp. 902-906

Author(s):

Feng Feng Li ◽

Wei Chao Yang ◽

Ming Xi Zhang ◽

Li Fang Zhang ◽

Yi Shen

Keyword(s):

Bending Strength ◽

Sintered Material ◽

Raw Materials ◽

Sintered Sample ◽

Molar Ratio ◽

Alumina Powder ◽

X Ray Diffraction ◽

X Ray ◽

Shock Resistance ◽

Sintered Temperature

Cordierite–mullite composites were prepared by using iron tailing, burn talc, suzhou soil, knar clay and alumina powder as raw materials. The main influencing factors such as the molar ratio of cordierite to mullite, amount of iron tailing and calcination temperature were discussed. The microstructure of the sintered sample was analyzed with X-ray diffraction (XRD) and Scanning electron microscopy (SEM). The results show that the optimal prescription was V sample (36.4635wt% of iron tailings, 13.6813 wt % of burn talc, 10.2154 wt % of suzhou soil, 3.8405 wt % of knar clay and 35.7984 wt% of alumina), and its sintered material contains about 50% of mullite and 50% of cordierite;The optimal sintered temperature was 1250°C and the holding time was 2 hours. The bending strength of the sample is 29.79MPa and the thermal shock resistance expriments are above 60 times.

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Study of biohydrometallurgical technology used to recover gold from ore at a gold-recovery plant

Kompleksnoe ispolʹzovanie mineralʹnogo syrʹâ/Complex Use of Mineral Resources/Mineraldik shikisattardy Keshendi Paidalanu ◽

10.31643/2021/6445.03 ◽

2021 ◽

Vol 316 (1) ◽

pp. 24-31

Author(s):

A. K. Koizhanova ◽

◽

G. V. Sedelnikova ◽

M. B. Erdenova ◽

A. N. Berkinbaeva ◽

...

Keyword(s):

Sodium Hypochlorite ◽

Raw Materials ◽

Test Sample ◽

Gold Recovery ◽

Sodium Hypochlorite Solution ◽

Mineral Raw Materials ◽

X Ray ◽

Acidophilic Bacteria ◽

Chemical Studies ◽

Physical And Chemical

The article contains the results of the studies performed for the biochemical eхtraction modes for mineral raw materials using thionic bacteria Acidithiobacillusferrooxidans of a certain strain capable to oxidize sulfide minerals. A representative sample of mineral raw materials was taken, and its physical and chemical studies were performed. The optimal conditions to leach mineral raw materials with biochemical solvents based on various factors (temperature, S:W) were established. Modern physical and chemical methods of analysis were used during the study: X-ray fluorescence, X-ray phase, mineralogical, electron probe, chemical analyzes, IR methods to study the phase composition of ores and changes in the structure of minerals. The chemical composition of the ore sample quartered and crushed up to a size of -0.074 mm is as follows, wt. %: SiO2 - 60.11; Al2O3 6.2; Zn 0.016; Cu 0.10; Fe - 2.5; S 0.50; Au - 3.67 g/t and Ag - 3.2 g/t. This paper discusses various options for agitational leaching with acid pre-wash, bacterial dissection and oxidative decomposition of minerals using sodium hypochlorite. The results obtained showed that the most effective method to increase the gold recovery is to perform bacterial oxidation of ore using acidophilic bacteria At. Ferrooxidans preliminarily adapted to the material composition of the test sample, followed by treatment with sodium hypochlorite solution and cyanidation. Biohydrometallurgical ore processing provides high gold recovery (78.1%).

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