Study on the Preparation of Calcium Sulfate Whisker by Hydrothermal Method

2012 ◽  
Vol 602-604 ◽  
pp. 1369-1372 ◽  
Author(s):  
Kang Bi Luo ◽  
Hu Ping Li ◽  
Yan Xia Tan
Keyword(s):  
Hydrothermal Method ◽  
Calcium Chloride ◽  
Sodium Sulfate ◽  
Calcium Sulfate ◽  
Sulfate Solution ◽  
Solution Concentration ◽  
Raw Material ◽  
Molar Ratio ◽  
Feed Mode ◽  
Calcium Sulfate Whiskers

This article took the sodium sulfate and calcium chloride as the raw material and prepared calcium sulfate whiskers by hydrothermal method. The experimental results show that the calcium sulfate precursors are prepared by the reverse feed mode in which the sodium sulfate solution drop into the calcium chloride solution under the solution concentration 0.6 mol/L and the molar ratio of Na2SO4 to CaCl2 at 1:1.8. The precursors were placed in pH=6.12 hydrothermal environments and treated in the autoclave at 140 °C for 4 h to obtain the calcium sulfate whiskers having for the ratio of length to diameter at 97.5 and the better morphology.

Preparation of calcium sulfate whiskers using waste calcium chloride by reactive crystallization

2010 ◽  
Vol 46 (2) ◽  
pp. 166-172 ◽  
Author(s):  
Xingfu Song ◽  
Lina Zhang ◽  
Jingcai Zhao ◽  
Yanxia Xu ◽  
Ze Sun ◽  
...  
Keyword(s):  
Calcium Chloride ◽  
Calcium Sulfate ◽  
Calcium Sulfate Whiskers ◽  
Reactive Crystallization

Study on Preparation of Calcium Sulfate Whisker with Leaching Tailings of Nickel Ore

2011 ◽  
Vol 287-290 ◽  
pp. 2084-2087 ◽  
Author(s):  
Li Wang ◽  
Chun Yan Zhuang ◽  
De Qin Meng
Keyword(s):  
Sulfuric Acid ◽  
Calcium Sulfate ◽  
Preparation Method ◽  
Orthogonal Experiment ◽  
Raw Material ◽  
High Grade ◽  
Reaction Conditions ◽  
Acid Reaction ◽  
Calcium Sulfate Whiskers ◽  
Calcium Sulfate Whisker

Taking leaching tailings of the nickel ore as raw material, calcium sulfate whiskers were prepared. The effects of Mg/Ca mole ratio, concentration of sulfuric acid, reaction temperature and precipitating time on the recovery of calcium were studied in this paper. The preparation method and reaction conditions of fibrous calcium sulfate whisker have been optimized by an orthogonal experiment, in order to obtain a high grade whisker product which could meet industrial requirements on whiteness and size.

Processing of Hydro-Mineral Lithium Raw Material of Kazakhstan Using Inorganic Sorbents

2021 ◽  
Vol 316 ◽  
pp. 643-648
Author(s):  
Zaure B. Karshigina ◽  
Zinesh S. Abisheva ◽  
Yelena G. Bochevskaya
Keyword(s):  
Manganese Oxide ◽  
Aluminum Hydroxide ◽  
Aluminum Chloride ◽  
Chloride Solution ◽  
Solution Concentration ◽  
Holding Time ◽  
Raw Material ◽  
Molar Ratio ◽  
Lithium Aluminum ◽  
Research Results

The article presents the results of studies on recovery of lithium from reservoir brines using both commercial and synthesized aluminum hydroxide and hydrated manganese oxide as sorbents. The research results showed that, when using commercial aluminum hydroxide and synthesized hydrated manganese oxide as sorbents, lithium recovery from brine was 21.8 and 20.1%, respectively. Studies were conducted on lithium chemisorption on freshly precipitated aluminum hydroxide, which was obtained by adding aluminum chloride solution and tri-calcium hydro-aluminate to the brine. Chemisorption of lithium was carried out under the following conditions: T = 50 °C; AlCl3 solution concentration - 120 g/dm3; molar ratio Li/Al = 7; pH equal = 8.0-8.8; holding time with stirring 1 h. The degree of lithium extraction from brine was 71%; lithium capacity of freshly precipitated Al (OH)3 was 5.9 mg/g. During calcareous leaching of lithium-aluminum precipitate, lithium was extracted into a solution by 74.7%.

scholarly journals DESAIN DAN KARAKTERISASI SEL SURYA SISTEM ELEKTRODA TEMBAGA (I) OKSIDA (Cu2O/Al) MODEL PIPA PADA LARUTAN NATRIUM SULFAT (Na2SO4)

2018 ◽  
Author(s):  
Rahma Yulis ◽  
Rahadian Zainul ◽  
Mawardi
Keyword(s):  
Solar Cells ◽  
Sodium Sulfate ◽  
Electrical Energy ◽  
Sulfate Solution ◽  
Solution Concentration ◽  
Liquid System ◽  
Electrode System ◽  
Measurement Time ◽  
The Stability

Research has been conducted on "Design and Characterization of Solar Cells for Copper Oxide Electrode System (Cu2O) Model Pipes in Sodium Sulfate Solution (Na2SO4)". Solar cells (photovoltaic cells) are devices that have the ability to convert sunlight energy into electrical energy by applying the principle of photovoltaic. The principle of photovoltaic is defined as a phenomenon of the emergence of electrical voltage due to the contact of two electrodes connected to a solid or liquid system when exposed under sunlight. This study aims to determine the effect of sodium sulfate electolite solution concentration, the effect of measurement time on the generated current, determination of the concentration of solar cells, and the effect of design on electric current. In this solar cell study, the optimum concentration of sodium sulfate was 0.75 M. The measurement time produced power was at 12.00 WIB, then the stability of solar cells on the fifth day and the optimum design of solar cells was in the design 2. The maximum power obtained is 0.12325 mWatt and the electrode ability to produce electricity per area is 49.938412 mWatt / m2 with. The electrode area used is 0.00246804 m2.

Interactive effects of sodium chloride, sodium sulfate, calcium sulfate, and calcium chloride on snapbean growth, photosynthesis, and ion uptake

1995 ◽  
Vol 18 (5) ◽  
pp. 889-900 ◽  
Author(s):  
S. Awada ◽  
W. F. Campbell ◽  
L. M. Dudley ◽  
J. J. Jurinak ◽  
M. A. Khan
Keyword(s):  
Sodium Chloride ◽  
Calcium Chloride ◽  
Sodium Sulfate ◽  
Calcium Sulfate ◽  
Ion Uptake ◽  
Interactive Effects

Preparation of calcium sulfate whiskers by carbide slag through hydrothermal method

2014 ◽  
Vol 49 (10) ◽  
pp. 800-807 ◽  
Author(s):  
Yongqian Wang ◽  
Yinchang Li ◽  
Ao Yuan ◽  
Bo Yuan ◽  
Xinrong Lei ◽  
...  
Keyword(s):  
Hydrothermal Method ◽  
Calcium Sulfate ◽  
Carbide Slag ◽  
Calcium Sulfate Whiskers

scholarly journals Application of Multistage Concentration (MSC) Electrodialysis to Concentrate Lithium from Lithium-Containing Waste Solution

Metals ◽  
2020 ◽  
Vol 10 (7) ◽  
pp. 851
Author(s):  
Yeonchul Cho ◽  
Kihun Kim ◽  
Jaewoo Ahn ◽  
Jaeheon Lee
Keyword(s):  
Sodium Sulfate ◽  
Lead Time ◽  
Concentration Ratio ◽  
Lithium Concentration ◽  
Volume Ratio ◽  
Sulfate Solution ◽  
Lithium Carbonate ◽  
Raw Material ◽  
Lithium Sulfate ◽  
Material Solution

In order to manufacture lithium carbonate to be used as a raw material for a secondary lithium battery, lithium sulfate solution is used as a precursor, and the concentration of lithium is required to be 10 g/L or more. Electrodialysis (ED) was used as a method of concentrating lithium in a low-concentration lithium sulfate solution, and multistage concentration (MSC) electrodialysis was used to increase the concentration ratio (%). When MSC was performed using a raw material solution containing a large amount of sodium sulfate, the process lead time was increased by 60 min. And the concentration ratio (%) of lithium decreased as the number of concentration stages increased. In order to remove sodium sulfate, methanol was added to the raw material solution to precipitate sodium sulfate, and when it was added in a volume ratio of 0.4, lithium was not lost. Using a solution in which sodium sulfate was partially removed, fourth-stage concentration ED was performed to obtain a lithium sulfate solution with a lithium concentration of 10 g/L.

Experimental Study on Accelerated Speed of Concrete Sulfate Attack

2012 ◽  
Vol 204-208 ◽  
pp. 3754-3759
Author(s):  
Hong Fei Liu ◽  
Fa Jun Huang
Keyword(s):  
Experimental Study ◽  
Compressive Strength ◽  
Sodium Sulfate ◽  
Sulfate Solution ◽  
Solution Concentration ◽  
Sulfate Attack ◽  
Sodium Sulfate Solution ◽  
Insignificant Difference ◽  
Compressive Strength Of Concrete

Through test on compressive strength of concrete and mass changes, the effects of solution concentration and temperature on speed of concrete sulfate attack were investigated. The results show that, the speed of attack is accelerated with increasing concentration and temperature, as well as the decreasing of the size of the specimen, sulfate attack speed at 45 °C sodium sulfate solution soak with wet and dry cycle is insignificant difference with at 20 °C.It is suitable to adopt compressive strength as the assessing criterion of the sodium sulfate attack.

Mango (Magnifera indica) seed oil grown in Dilla town as potential raw material for biodiesel production using NaOH- a homogeneous catalyst

2019 ◽  
Author(s):  
Chem Int
Keyword(s):  
Diesel Engine ◽  
Physicochemical Properties ◽  
Seed Oil ◽  
Methyl Esters ◽  
Pollution Prevention ◽  
Raw Material ◽  
Biodiesel Production ◽  
Molar Ratio ◽  
Homogeneous Catalyst ◽  
Minimal Amount

Biodiesel produced by transesterification process from vegetable oils or animal fats is viewed as a promising renewable energy source. Now a day’s diminishing of petroleum reserves in the ground and increasing environmental pollution prevention and regulations have made searching for renewable oxygenated energy sources from biomasses. Biodiesel is non-toxic, renewable, biodegradable, environmentally benign, energy efficient and diesel substituent fuel used in diesel engine which contributes minimal amount of global warming gases such as CO, CO2, SO2, NOX, unburned hydrocarbons, and particulate matters. The chemical composition of the biodiesel was examined by help of GC-MS and five fatty acid methyl esters such as methyl palmitate, methyl stearate, methyl oleate, methyl linoleate and methyl linoleneate were identified. The variables that affect the amount of biodiesel such as methanol/oil molar ratio, mass weight of catalyst and temperature were studied. In addition to this the physicochemical properties of the biodiesel such as (density, kinematic viscosity, iodine value high heating value, flash point, acidic value, saponification value, carbon residue, peroxide value and ester content) were determined and its corresponding values were 87 Kg/m3, 5.63 Mm2/s, 39.56 g I/100g oil, 42.22 MJ/Kg, 132oC, 0.12 mgKOH/g, 209.72 mgKOH/g, 0.04%wt, 12.63 meq/kg, and 92.67 wt% respectively. The results of the present study showed that all physicochemical properties lie within the ASTM and EN biodiesel standards. Therefore, mango seed oil methyl ester could be used as an alternative to diesel engine.

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