Optimization of Conditions for Extraction of Acid-Soluble Al2O3 from Pyrophyllite

2011 ◽  
Vol 366 ◽  
pp. 330-333
Author(s):  
Jun Jun Wu ◽  
Hai Feng Chen ◽  
Shi Jiang Zhao ◽  
Bin Li
Keyword(s):  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Thermal Activation ◽  
Acid Leaching ◽  
Hydrochloric Acid Concentration ◽  
Activation Temperature ◽  
Different Temperatures ◽  
Heat Activation ◽  
Silicate Clay ◽  
The Relationship

Pyrophyllite was the cheap, environmentally friendly alumina silicate clay minerals. This paper studied optimization of conditions for extraction of acid-soluble Al2O3 from pyrophyllite. Qualitative tests had been performed in studying pyrophyllite crystal at different temperatures by using scanning electron microscopy. Dissolution experiments showed that after thermal activation the behavior of alumina in acid the dissolution was different, which was affected by hydrochloric acid concentration, heat activation temperature and acid leaching time. When the calcinations temperature was 700 °C and hydrochloric acid concentration was 25%, the dissolution amount of alumina largest. The fit results indicated that the research for the relationship between dissolution and time by Using Exponential function series Asymptotic1 model to fitting match was the best. So the above function could be used to estimate each time the dissolution of alumina from pyrophyllite in hydrochloric acid.

The Impact of Heat Treatment on Pyrophyllite Structure and Acid-Soluble Properties

2011 ◽  
Vol 366 ◽  
pp. 326-329 ◽  
Author(s):  
Jun Jun Wu ◽  
Hai Feng Chen ◽  
Shi Jiang Zhao ◽  
Bin Li
Keyword(s):  
Heat Treatment ◽  
Thermal Activation ◽  
Acid Leaching ◽  
Basic Structure ◽  
Hydrochloric Acid Concentration ◽  
Activation Temperature ◽  
Different Temperatures ◽  
Ft Ir ◽  
Heat Activation ◽  
The Impact

This paper studied the influence of heat treatment on the pyrophyllite structure and acid-soluble properties of alumina. Qualitative tests had been performed in studying pyrophyllite crystal at different temperatures by XRD, TG-DTA, FT-IR and quantitative analysis of Al2O3. The quantitative titration method studied the dissolve characteristics of the different heat treatment samples in different acid conditions, and then a numerical simulation was done. The results showed that at temperatures below 480 °C, the pyrophyllite did not change the basic structure. 480~700 °C dehydroxylation reaction occurred, and the structure water of pyrophyllite is removed, and then turned into partial pyrophyllite. Dissolution experiments showed that after thermal activation the behavior of alumina in acid the dissolution was different, which was affected by hydrochloric acid concentration, heat activation temperature and acid leaching time. When the calcinations temperature was 700 °C, the dissolution amount of alumina was largest. These works could provide some theoretical basis for further application of pyrophyllite research.

scholarly journals Solvent Extraction of Thorium(IV) by Didodecylphoric Acid

2003 ◽  
Vol 8 (2) ◽  
pp. 107
Author(s):  
Fawwaz I. Khalili ◽  
Khaled M. Mousa ◽  
Ehsan I. Soudani
Keyword(s):  
Free Energy ◽  
Ionic Strength ◽  
Solvent Extraction ◽  
Hydrochloric Acid ◽  
Distribution Coefficient ◽  
Acid Concentration ◽  
Supporting Electrolyte ◽  
Hydrochloric Acid Concentration ◽  
Different Temperatures ◽  
Extraction Processes

Solvent extraction of Thorium (VI) ion from perchlorate solution using didodecylphosphoric acid, DDPA, in chloroform diluent was studied. The effects of stripping hydrochloric acid concentration, stripping time, extraction time, DDPA concentration, pH, ionic strength, supporting electrolyte and temperature on the extraction processes have been studied. From the distribution coefficient values at different temperatures,the enthalpy, the free energy and the entropy changes associated with the extraction processes were determined. The composition of the complex formed was established to be Th(ClO4)4-nRn(HR)5-n where, n=1 or 2 and (HR)2 represents the dimer of DDPA.  

Research on the Extract Al2O3 from Coal Gangue

2012 ◽  
Vol 524-527 ◽  
pp. 1947-1950 ◽  
Author(s):  
Lei Zhang ◽  
Hao Wang ◽  
Yu Li
Keyword(s):  
Hydrochloric Acid ◽  
Aluminum Oxide ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Coal Gangue ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Mass Ratio ◽  
Sample Mass ◽  
Solid Ratio

The experiments selected Wang Taipu gangue as raw materials and adopted single factor experimental method to study the leaching of aluminum oxide from gangue by using hydrochloric acid as leaching medium. The experiments studied solvent/sample mass ratio, hydrochloric acid/sample, liquid-solid ratio, hydrochloric acid concentration, leaching time and leaching temperature on Al2O3 leaching rate of coal gangue. Through the parallel experiment of the above factors, we can found that optimization conditions of hydrochloric acid leaching of alumina were: solvent /sample mass ratio: 0.20, solvent: NaF, liquid-solid ratio: 1:10, hydrochloric acid concentration: 6mol/L, leaching time: 150min, leaching temperature:110°C. In this case, the aluminum oxide of optimal leaching rate was 79.33%.

Research of Al and Fe Leaching Rate in the Process of Slag Leaching by Hydrochloric Acid

2014 ◽  
Vol 675-677 ◽  
pp. 1417-1420
Author(s):  
Guang Qiang Mang ◽  
Ming Cheng
Keyword(s):  
Blast Furnace ◽  
Reaction Time ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Reaction Temperature ◽  
Acid Leaching ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Furnace Process ◽  
Leaching Condition

Smelting slag from mineral process and blast furnace process to vanadium titanium magnetite is a kind of precious secondary resource in which TiO2 content is higher than 20%. Taking titanium-bearing blast furnace slag in Panzhihua region as research object, this paper analyzes four factors that affect the leaching rate of Al and Fe. The four factors are reaction temperature, reaction time, acid concentration, and the ratio of acid and slag. The conclusion drawn from hydrochloric acid leaching experiment is the factor that causes greatest effect to leaching rate of Al and Fe is reaction temperature, then reaction time follows. Acid concentration and the ratio of acid and slag cause insignificant affect. Appropriate leaching condition is 5h reaction time, 5mol/L hydrochloric acid concentration, 90°C~100°C reaction temperature and 1.2 the ratio of acid and slag. Max leaching rate of Al and Fe is 78.5% and 65.8% respectively.

Experimental Study on Concentrating Scandium by Leaching from Associated Scandium Ore

2013 ◽  
Vol 734-737 ◽  
pp. 1033-1036
Author(s):  
Gui Fang Zhang ◽  
Peng Yan ◽  
Qing Rong Yang
Keyword(s):  
Experimental Study ◽  
Particle Size ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Hydrochloric Acid Concentration ◽  
Leaching Rate ◽  
Optimal Conditions ◽  
Research Results ◽  
Solid Ratio ◽  
Leaching Residue

Based on the benefication of the complex silicate ore containing scandium, the research about aid-leaching agent used in the leaching of the scandium concentrate was been conducted. And the suitable leaching agent and aid-leaching agent which the useful ions entered into leaching liquid and the harmful ions were kept in leaching residue were been found according to the experiment results. For the scandium of sample existed various complex silicate ore as isomorphism form, the research has adopted hydrochloric acid with aid-leaching agent to dissociate the silicate ore and make scandium entering into solution. The research results has shown that the scandium leaching rate could reach 92.06% under the optimal conditions which the hydrochloric acid concentration is 22.8%, the dosage of aid leaching agent is 6%, liquid solid ratio is 4:1, particle size of leaching material totally is less than 0.15mm and leaching time is 8h.

Effects of high hydrochloric acid concentration on aniline chemical polymerization

Polymer ◽  
1997 ◽  
Vol 38 (20) ◽  
pp. 5247-5250 ◽  
Author(s):  
Gustavo M. Morales ◽  
Marcos Llusa ◽  
Maria C. Miras ◽  
Cesar Barbero
Keyword(s):  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Hydrochloric Acid Concentration ◽  
Chemical Polymerization

Extraction of Tin (Sn) from Solder Dross by Using Hydrochloric Acid Leaching Treatment

2015 ◽  
Vol 754-755 ◽  
pp. 567-570
Author(s):  
Syarifah Aminah Ismail ◽  
Noorina Hidayu Jamil ◽  
Kamarudin Hussin ◽  
Mohd Arif Anuar Mohd Salleh
Keyword(s):  
Aqueous Solution ◽  
Particle Size ◽  
Hydrochloric Acid ◽  
Acid Concentration ◽  
Acid Leaching ◽  
Experimental Results ◽  
Solution Temperature ◽  
Hydrochloric Acid Leaching ◽  
Stirring Time ◽  
Acid Aqueous Solution

This project deals with the experimental results of leaching of Sn from solder dross by means of leaching using different concentration of hydrochloric acid (HCl). Solder dross was sieved to obtain a mean particle size of 75 μm. The solder dross powder obtained was leached by using HCl acid aqueous solution. To optimize the parameter required for recovery of Sn from solder dross, initially the bench scale studies were carried out using varying acid concentration, stirring time and temperature. The experimental indicate that 98.7% of Sn was leached out from solder dross using 0.1M of HCl, 24 hours of stirring time at60°C solution temperature.

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