Preparation of Xonotlite Nano-Fibres Using the Silica Source from Coal Fly Ash and Ca(OH)2

2014 ◽  
Vol 633 ◽  
pp. 7-10 ◽  
Author(s):  
Jing Yang ◽  
Xin Zhang ◽  
Hong Wen Ma ◽  
Ming Wei Wang ◽  
Han Wu
Keyword(s):  
Fly Ash ◽  
Calcium Silicate ◽  
Coal Fly Ash ◽  
High Alumina ◽  
Thermal Synthesis ◽  
Hydrated Calcium Silicate ◽  
Hydrothermal Temperature ◽  
Silica Source ◽  
Naoh Solution ◽  
Hydrated Calcium

Extracting aluminum oxide from high-alumina coal fly ash are significant to make up for the inadequacy of bauxite resource in China. How to comprehensively utilize silica components in coal fly ash is a key technical question in industrialization for extracting of alumina from coal fly ash. Desilication of coal fly ash (CFA) and preparation of xonotlite were studied using the silica-rich solution from the CFA as silica source and calcium oxide as calcium source respectively. The CFA is from a power plant at Shizuishan city in Ningxia, China. Xonotlite was successfully prepared by a series processes including predesilication, hydro-thermal synthesis. The experimental results indicated that SiO2in the coal fly ash changed into NaSiO3after the coal fly ash was treated by desilication using NaOH solution. Hydrated calcium silicate was obtained from the reaction of the solutions produced by desilication and Ca (OH)2at the condition of Ca/Si (mol)=1, T=160°Cand t=1h. Xonotlite was synthesized by the hydrated calcium silicate using the hydrothermal temperature of 260°C for 2 hours. Keywords: Coal Fly Ash, Pre-desilication, alkali Hydrothermally-treated, Xonotlite nanofibres

scholarly journals Preparation of Hydrated Calcium Silicate High Filler Ink and Study on Printing Suitability

2019 ◽  
Vol 5 (05) ◽  
Author(s):  
Xu Peng ◽  
Wang Yingying ◽  
Tian Jianxin ◽  
Fan Dongdong ◽  
Gao Shuai
Keyword(s):  
Fly Ash ◽  
Calcium Silicate ◽  
Filling Ratio ◽  
High Alumina ◽  
Oil Absorption ◽  
Hydrated Calcium Silicate ◽  
Color Density ◽  
Printing Ink ◽  
Hydrated Calcium ◽  
Wide Potential

In the process of extracting alumina from high-alumina fly ash of power plant, the amorphous silica in fly ash is extracted by alkali solution and precipitated with lime milk to synthesis hydrated calcium silicate powder, which has the characteristics of high oil absorption, high value, low abrasion value, large specific surface area and low bulk density, show that the addition of hydrated calcium silicate filler to the printing ink helps to improve the viscosity, fineness, color density, color and other indicators. The filler filling ratio is higher than traditional ink fillers such as calcium carbonate. It is expected that the hydrated calcium silicate filler has wide potential application value in ink reduction, VOCs control and functionality.

Abundances and distribution of minerals and elements in high-alumina coal fly ash from the Jungar Power Plant, Inner Mongolia, China

2010 ◽  
Vol 81 (4) ◽  
pp. 320-332 ◽  
Author(s):  
Shifeng Dai ◽  
Lei Zhao ◽  
Suping Peng ◽  
Chen-Lin Chou ◽  
Xibo Wang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Power Plant ◽  
Inner Mongolia ◽  
Coal Fly Ash ◽  
High Alumina

Characteristics of Hydrated Calcium Silicate and Paper Filler

2013 ◽  
Vol 395-396 ◽  
pp. 577-581
Author(s):  
Quan Xiao Liu ◽  
Yan Na Yin ◽  
Wen Cai Xu
Keyword(s):  
Tensile Strength ◽  
Calcium Silicate ◽  
Crystalline State ◽  
X Ray Diffraction ◽  
Hydrated Calcium Silicate ◽  
X Ray ◽  
Color Density ◽  
Paper Filler ◽  
Hydrated Calcium ◽  
Tearing Strength

The X-ray diffraction of hydrated calcium silicate is analyzed and is applied in papermaking. It shows that hydrated calcium silicate have certain crystalline state. The tensile strength, tearing strength and folding strength of paper decrease in different degree with the increase of dosage of hydrated calcium silicate while the whiteness and the printing color density of paper improve. T tensile strength and folding strength of paper decrease in varying degrees with the increase of dosage of PAM while the tearing strength of paper and the whiteness improve. And the printing color density of paper is the same.

The identity of jurupaite and xonotlite

1954 ◽  
Vol 30 (224) ◽  
pp. 338-341 ◽  
Author(s):  
H. F. W. Taylor
Keyword(s):  
Calcium Silicate ◽  
Hydrated Calcium Silicate ◽  
Brown Discoloration ◽  
The One ◽  
Hydrated Calcium

Jurupaite was discovered at Crestmore, California, by A. S. Eakle in 1921. The mineral was found in a quarry which was rapidly being enlarged, and Eakle stated that it was probably represented only by the one specimen which he had collected. He showed that it was a hydrated calcium silicate containing magnesia, with the composition 2(Ca,Mg)O. 2SiO2. H2O, the ratio of lime to magnesia being approximately 7 : 1.This specimen passed into the keeping of Professor A. Pabst, who kindly made a portion available to the writer. He confirmed that it was unlikely that any other specimen existed. The jurupaite consisted of rosettes of white needles or fibres, about a centimetre in diameter. A brown discoloration was observed on the exposed outer surfaces of the specimen, but not on freshly cut surfaces. Calcite was present in contact with the jurupaite.

Research and Application on Magnesium Slag

2011 ◽  
Vol 280 ◽  
pp. 208-211 ◽  
Author(s):  
Si Yu Wang ◽  
Li Guang Xiao ◽  
Qiang Zhou ◽  
Kai Xu ◽  
Bao Li Chen ◽  
...  
Keyword(s):  
Calcium Silicate ◽  
Cementitious Material ◽  
Good Combination ◽  
Phase Changes ◽  
Differential Analysis ◽  
Ideal Strength ◽  
Hydration Products ◽  
Hydrated Calcium Silicate ◽  
Hydrated Calcium ◽  
The Ideal

The content of water glass in accordance with the size of range is a major factor in magnesium slag strength. The microstructure of the block of orthogonal testing three shows network-like, acicular, cotton wool attached to each other, the main hydration products are calcium silicate hydrate, needle-like ettringite and CSH gel, just the good combination among the hydration products the cementitious material get the ideal strength value. From the view of differential analysis curve, Ca (OH) 2 decomposed when the temperature reaches 500 °C -540 °C, Ca (OH) 2 generated by the calcium component within the cementitious material reaction with alkali, and the Ca (OH) 2 will participate in the reaction of hydrated calcium silicate gel, and enhance strength of the test block. From the TG thermal analysis we can see that there is no water loss in the process, the performance of ofmineral phase changes and thermal stability are great.

Fabrication of Nano Zeolite P from Coal Fly Ash by Combining Alkaline — Fusion and Hydrothermal Reactions

2013 ◽  
Vol 591 ◽  
pp. 126-129 ◽  
Author(s):  
Yong Zai Wang ◽  
Le Wang ◽  
Hong Ming Xu ◽  
Shao Hui Luo
Keyword(s):  
Fly Ash ◽  
Single Phase ◽  
Hydrothermal Reaction ◽  
Coal Fly Ash ◽  
Reaction Products ◽  
Hydrothermal Temperature ◽  
Hydrothermal Reactions ◽  
Alkaline Fusion ◽  
Crystallite Sizes ◽  
Zeolite P

Well-crystallised nanozeolite P has been synthesized from coal fly ash by combined method of alkaline-fusion and hydrothermal reactions. The influence of preparation parameters, such as the proportion of fly ash/NaOH, the hydrothermal reaction temperature and time on the reaction products were investigated by XRD and FESEM. Results indicated that, the optimum conditions for fabrication of a single phase of zeolite P were the mass ratio of fly ash/ NaOH =1/1, fusion temperature at 550°C and hydrothermal temperature at 100°C for 48h .The average crystallite sizes of the zeolite samples are 29.4nm. The obtained products show crystal morphology heterogeneity comprised by various euhedral forms.

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