Magnesia Sinter with Flux Based on Magnesium Silicate

IntroductionTraditional steatite ceramics, made by firing (vitrifying) hydrous magnesium silicate, have long been used as insulators for high frequency applications due to their excellent mechanical and electrical properties. Early x-ray and optical analysis of steatites showed that they were composed largely of protoenstatite (MgSiO3) in a glassy matrix. Recent studies of enstatite-containing glass ceramics have revived interest in the polymorphism of enstatite. Three polymorphs exist, two with orthorhombic and one with monoclinic symmetry (ortho, proto and clino enstatite, respectively). Steatite ceramics are of particular interest a they contain the normally unstable high-temperature polymorph, protoenstatite.Experimental3mm diameter discs cut from steatite rods (∼10” long and 0.5” dia.) were ground, polished, dimpled, and ion-thinned to electron transparency using 6KV Argon ions at a beam current of 1 x 10-3 A and a 12° angle of incidence. The discs were coated with carbon prior to TEM examination to minimize charging effects.

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GEOCOLOGICAL RISKS AND MITIGATION IN MAGNESIUM SILICATE DEPOSIT MINING

MINING INFORMATIONAL AND ANALYTICAL BULLETIN ◽

10.25018/0236-1493-2018-2-0-111-117 ◽

2018 ◽

Vol 2 ◽

pp. 111-117

Author(s):

L.I. Khudyakova ◽

◽

O.V. Voiloshnikov ◽

Keyword(s):

Magnesium Silicate

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Investigation on the effect of tungsten doping and sintering temperature on microwave dielectric properties of lithium magnesium silicate ceramics

Journal of Materials Science Materials in Electronics ◽

10.1007/s10854-020-03412-9 ◽

2020 ◽

Vol 31 (11) ◽

pp. 8773-8779

Author(s):

Aleena Rose ◽

B. Masin ◽

K. Ashok ◽

H. Sreemoolanadhan ◽

T. Vijayakumar

Keyword(s):

Dielectric Properties ◽

Sintering Temperature ◽

Microwave Dielectric Properties ◽

Magnesium Silicate ◽

Microwave Dielectric ◽

Tungsten Doping

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Attributes of the soil fertilized with sewage sludge and calcium and magnesium silicate

Revista Brasileira de Engenharia Agrícola e Ambiental ◽

10.1590/1807-1929/agriambi.v19n11p1107-1113 ◽

2015 ◽

Vol 19 (11) ◽

pp. 1107-1113 ◽

Cited By ~ 2

Author(s):

Geraldo R. Zuba Junio ◽

Regynaldo A. Sampaio ◽

Altina L. Nascimento ◽

Luiz A. Fernandes ◽

Natália N. de Lima ◽

...

Keyword(s):

Sewage Sludge ◽

Cation Exchange ◽

Cation Exchange Capacity ◽

Ricinus Communis ◽

Block Design ◽

Magnesium Silicate ◽

Exchange Capacity ◽

Sludge Compost ◽

Sewage Sludge Compost ◽

Randomized Block Design

ABSTRACTThis study aimed to evaluate the chemical attributes of an Inceptisol cultivated with castor bean (Ricinus communis L.), variety ‘BRS Energia’, fertilized with sewage sludge compost and calcium (Ca) and magnesium (Mg) silicate. The experiment was conducted at the ICA/UFMG, in a randomized block design, using a 2 x 4 factorial scheme with three replicates, and the treatments consisted of two doses of Ca-Mg silicate (0 and 1 t ha-1) and four doses of sewage sludge compost (0, 23.81, 47.62 and 71.43 t ha-1, on dry basis). Soil organic matter (OM), pH, sum of bases (SB), effective cation exchange capacity (CEC(t)), total cation exchange capacity (CEC(T)), base saturation (V%) and potential acidity (H + Al) were evaluated. There were no significant interactions between doses of sewage sludge compost and doses of Ca-Mg silicate on soil attributes, and no effect of silicate fertilization on these attributes. However, fertilization with sewage sludge compost promoted reduction in pH and increase in H + Al, OM and CEC. The dose of 71.43 t ha-1 of sewage sludge compost promoted the best soil chemical conditions.

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Fabrication of highly efficient magnesium silicate and its adsorption behavior towards Cr(VI)

Microporous and Mesoporous Materials ◽

10.1016/j.micromeso.2021.111196 ◽

2021 ◽

pp. 111196

Author(s):

Xuekai Wang ◽

Jinshu Wang ◽

Weili Teng ◽

Yucheng Du ◽

Junshu Wu ◽

...

Keyword(s):

Magnesium Silicate ◽

Adsorption Behavior ◽

Highly Efficient

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Evidence of formation of an amorphous magnesium silicate (AMS) phase during alkali activation of (Na-Mg) aluminosilicate glasses

Cement and Concrete Research ◽

10.1016/j.cemconres.2021.106464 ◽

2021 ◽

Vol 145 ◽

pp. 106464

Author(s):

Harisankar Sreenivasan ◽

Elijah Adesanya ◽

He Niu ◽

Priyadharshini Perumal ◽

Anu M. Kantola ◽

...

Keyword(s):

Magnesium Silicate ◽

Alkali Activation ◽

Aluminosilicate Glasses

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Photodegradation of Phenolic Compounds from Water in the Presence of a Pd-Containing Exhausted Adsorbent

Applied Sciences ◽

10.3390/app10238440 ◽

2020 ◽

Vol 10 (23) ◽

pp. 8440

Author(s):

Lavinia Lupa ◽

Laura Cocheci ◽

Bogdan Trica ◽

Adina Coroaba ◽

Adriana Popa

Keyword(s):

Phenol Degradation ◽

Magnesium Silicate ◽

Degradation Process ◽

Liquid Ratio ◽

Phenol Solution ◽

Secondary Sources ◽

Great Economic Importance ◽

Phenol Photodegradation ◽

Cyphos Il 101 ◽

Solid Liquid

A closed-cycle technology regarding the use of an exhausted Pd-based adsorbent as a photocatalyst in the degradation process of phenol is presented. Pd (II) represents a precious metal of great economic importance. Its obtained from natural sources become more difficult to achieve. Therefore, also considering the regulations of the “circular economy,” its recovery from secondary sources turn out to be a stringent issue in the last years. Pd(II) ions are removed from aqueous solution through adsorption onto Florisil (an inorganic solid support—magnesium silicate) impregnated with Cyphos IL 101 (trihexyl tetradecyl phosphonium chloride). It was observed that the presence of the ionic liquid (IL) in the adsorbent structure doubles the adsorption efficiency of the studied materials. The newly obtained Pd-based photocatalyst was exhaustively characterized and was used in the degradation process of phenol from aqueous solutions. The phenol degradation process was studied in terms of the nature of the photocatalyst used, time of photodegradation and solid: liquid ratio. It was observed that both the presence of IL and Pd lead to an increase in the efficiency of the phenol degradation process. The new Pd-based photocatalyst could be efficiently used in more cycles of phenol photodegradation processes. When is used as a photocatalyst the Florisil impregnated with IL and loaded with 2 mg/g of Pd, a degree of mineralization of 93.75% is obtained after 180 min of irradiation of a phenol solution having a concentration of 20 mg/L and using a solid:liquid ratio = 1:1.

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Ceramic Proppants Based on Ultrabasic Rocks of Kazakhstan Chromite Ore Deposits

Materials Science Forum ◽

10.4028/www.scientific.net/msf.946.169 ◽

2019 ◽

Vol 946 ◽

pp. 169-173

Author(s):

A.A. Biryukova ◽

T.D. Dzhienalyev ◽

A.V. Boronina

Keyword(s):

Oil And Gas ◽

Mineralogical Composition ◽

Magnesium Silicate ◽

Gas Production ◽

Ore Deposits ◽

Raw Material ◽

Chrome Spinel ◽

Overburden Rock ◽

Oil And Gas Production ◽

Silicate Ceramic

The purpose of the work is the obtaining of magnesium silicate ceramic proppants, based on ultrabasic overburden rocks of Kempirsai deposits of chromite ores (Kazakhstan). The chemical and mineralogical composition of ultrabasic overburden rock was studied by chemical, microscopic and X-ray diffraction analyzes. It is established that the main mineral of ultrabasic overburden rocks is serpentine, present in the form of fibrous chrysotile and lamellar antigorite. In the impurities are iron oxides and hydroxides, chrome spinel, carbonates, quartz. Assessment of the use of overburden rocks as a raw material for the production of ceramic proppants was carried out. The sintering interval of overburden rocks was determined at 1280-1300 °C. The sintering firing optimum temperature of ceramics, based on this type of raw material is 1300 °C. It is established that to harden the structure of magnesium silicate ceramic it is necessary to activate the raw material thermally at a temperature of 1000 °C. The influence of binder type on the properties of magnesium silicate proppants, based on the Kempirsai serpentinites was studied. Magnesium silicate proppants, based on ultrabasic overburden rocks, were obtained with the following properties: apparent density – 1.6 g/cm3, strength resistance (52 MPa) – 14%, sphericity and roundness – 0.8; chemical resistance (hydrochloric acid) – 98%, static strength of the fraction 16/20 - 72–118 N/granule. The field of application is oil and gas production, metallurgy and ceramic industries.

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