1 edition of Leaching rates for the HC1 extraction of aluminum from calcined kaolinitic clay found in the catalog.
Leaching rates for the HC1 extraction of aluminum from calcined kaolinitic clay
Includes bibliographical references.
|Statement||by R.S. Olsen ... [et al.].|
|Series||Report of investigations / United States Department of the Interior, Bureau of Mines ;, 8744, Report of investigations (United States. Bureau of Mines) ;, 8744.|
|Contributions||Olsen, R. S.|
|LC Classifications||TN23 .U43 no. 8744, TP245.A4 .U43 no. 8744|
|The Physical Object|
|Pagination||11 p. :|
|Number of Pages||11|
|LC Control Number||82600329|
The combination of calcined kaolinitic clays and limestone in Limestone Calcined Clay Cement (LC3) is a promising approach to reduce the cost and the CO2 emissions of cement production by reducing the clinker content of cement. This thesis investigates the feasibility of using various grades of calcined clays in LC3. LC blends with a clinker content reduced to 50% are by: 3. The product is termed as calcined clay. The calcination in EICL is done in rotary calciners. By controlling the calcination temperature, Metakaolin (–°C), Spinel (–°C) or Mullite Phases (>°C) of calcined kaolin can be produced. Metakaolin has applications in cement, rubber, cables & .
The leaching experiments were successful extracting more than 90% of the initial copper concentration in the one-step leaching. The best parameters were proved to be L/S 10 with a leaching time of 30 minutes. The two-step leaching, only involving the ash samples, gave a higher extraction yield allowing for a cheaper disposal method of the ash. Chemical leaching experiments with citric and oxalic acids on bauxite leaching result in a maximum extraction of aluminum to be nearly 39% at elevated concentrations of leaching agents and hours residence time. Keywords: Bioleaching, Bauxite, Microbial EPS, Specificity, Alumina Extraction of aluminum from raw bauxite involves.
3C 2 O 4 2-+ Fe 3+ [Fe(C 2 O 4) 3] Recent investigations have focused mainly on the study of iron extraction from kaolin, whose main component is kaolinite. In this work the method of iron removal by oxalic acid in a clay sample was adopted. For this purpose, an experimental design was carried out using a 2 k Factorial Design, where k is the number of factors . prepared composite was investigated by leaching test according to European technical standard EN . Leaching test is a suitable laboratory method for testing the material behaviour in various conditions. Leaching of material in modified extraction agents can approximate behaviour of material in natural conditions.
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Leaching rates for the HC1 extraction of aluminum from calcined kaolinitic clay. [Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC) Online version: Leaching rates for the HC1 extraction of aluminum from calcined kaolinitic clay.
[Washington, D.C.]: U.S. Dept. of the Interior, Bureau of Mines, (OCoLC. The leching reaction for calcined kaolinitic clay in a 5 pct stoichiometric excess of boiling to pct HCl was found to be zero order. Rate constants based on the weight-fraction of aluminum in the clay were found to be between and min-1 depending on feed preparation and leaching parameters.
Nitric acid leaching rates determined for calcined kaolinitic clay prepared by this method were found to correspond to a zero-order reaction model for both batch and continuous, stirred-tank leaching.
A rate constant of 0.C min-1 was determined. LEACHING ALUMINUM FROM CALCINED KAOLINITIC CLAY WITH NITRIC ACID By Richard S. Olsen, 1 William G.
Gruzensky,2 Sophie J. Bullard,3 R. Beyer, 1 and Jack L. Henry 4 ABSTRACT Prior work by the Bureau of Mines demonstrated a feed preparation method that eliminates the formation of slime during leaching of calAuthor: R.
Olsen. Sulfurous acid leaching of calcined kaolin with a caustic purification does not produce alumina that meets cell feed specifications for alumina purity.
A major contaminant is sulfur, which is not decreased by caustic purification. The process requires long leach duration and yields low alumina extraction. "The Bureau of Mines investigated the extraction of alumina from calcined kaolin by leaching with boiling HCl in a train of three gal continuous, stirred reactors.
Slurry discharged from the reactors contained an excessive amount of fines, which impeded solid-liquid by: 2. Extraction of Alumina from Local Clays by Hydrochloric Acid Process 35 6 M 10 Fig. Effect of leaching time and acid concentration on extraction on Al2O3 extraction at acid to clay ratio weight ratio of 10 and boiling temperature.
Fig. Effect of acid to clay weight ratio on alumina extraction at different acid concentrations. 15 20 25 30 from 25 to 20%, decreasing the leaching time 1 to 2 hour to 15 to 30 min eliminating the solvent extraction step for iron removal and eliminating the step to recover the aluminum content of the bleed stream circuit.
A bench work study was carried out to investigate the use of kaolinitic clay containing % Al2O3 extremelyFile Size: KB. Raw coal-series kaolin samples were calcined at different temperature, and then were respectively leached by hydrochloric acid solution (15 wt%, L/S ratio of 10 cm 3 /g) at °C for 60 min.
The influence of calcination temperature on extraction rate of Al is shown in Fig. n °C and °C, the extraction rate of Al increases from % to % with calcination temperature, but Cited by: 8. The IUPAC defines calcination as "heating to high temperatures in air or oxygen".
However, calcination is also used to mean a thermal treatment process in the absence or limited supply of air or oxygen applied to ores and other solid materials to bring about a thermal decomposition.A calciner is a steel cylinder that rotates inside a heated furnace and performs indirect high-temperature.
The alumina extraction percent was determined at different leaching times ( min) and solid/liquid ratios ( g/ml). The purity of kaolin is about 95%. The transformation of kaolinite and aluminum extraction that occurred in each calcined sample have been characterized using XRD, TG, IR, and hydrochloric acid leaching methods.
C.-Y. Wu et al., “Extraction of aluminum by pressure acid-leaching method from coal fly ash,” Transactions of. Nonferrous Metals Society of China, 22 (), – CrossRef Google ScholarAuthor: Dmitry Valeev, Vyacheslav Pak, Alexandra Mikhailova, Margarita Gol’Dberg, Mark Zheleznyi, Irina Doro.
Hulbert and Huff [ 11 ] compared leaching rates of calcined kaolin in various acids and tested their data on a nucleation type model of the form: lnf l /(1- X)l= Ktm (3) where:X=the fraction of aluminium leached at time t;K=a first order rate constant;m=a parameter describing reaction mechanism, particle geometry, nucleation rate and hydration Cited by: Williams, ) or down to 20 per cent AlsO 3 for high-alumina kaolinitic clay (Mark, ), for the purposes of this paper the low limit of high- alumina clays will be placed arbitrarily at 40 per cent, A on the raw clay basis, i.e., just above the theoretical alumina content of kaolinite.
Boric acid. See also what's at Wikipedia, your library, or elsewhere. Broader term: Inorganic acids; Used for: Boracic acid; Filed under: Boric acid Effects of borax and. Kaolinite is a suitable material for fixing TiO2 nanoparticles in a composite form. The kaolinite/TiO2 composite has promising photoactive properties which are as important as is the possible impact of the composite on the environment.
Accordingly, the stability of the kaolinite/TiO2 composite dried at °C (KTI1) and calcined at °C (KTI6) and the stability of the original kaolinite Author: Michaela Tokarčíková, Kateřina Mamulová Kutláková, Jana Seidlerová.
The kinetics study of iron leaching from kaolin clay from the County of Agua Blanca (Mexico) was carried out using solutions of oxalic acid for iron dissolution.
The effects of acid concentration and temperature were studied to determinate kinetics parameters during iron leaching in oxalic acid media. To solve the problem of treating and leaching a clay ore in which the gold was finely disseminated, the author was able to suggest a unique method which he had seen described twenty-five years previously in a paper, “Occurrence and Treatment of Gold Ore at Bidi, Sarawak, Borneo,” by T.
Scrutton, which appeared in Trans. 15, I. M.,in which clay ore was treated by leaching. Calcined kaolin is a powdered white non-plastic material.
It is raw kaolin that has been fired (in a rotary calcining kiln) high enough to remove the 12% (approx) crystal water.
If you are a potter you can make your own calcined kaolin by simply bisque firing any raw powdered kaolin (in a small enough bisque vessel and slow enough ramp that the. Effect of calcination temperature of tunisian clays on the properties of geopolymers Ceramics – Silikáty 57 (3) () crystal and protected by a little bell from environmental pollution during the spectrum acquisition, which was per- formed regularly until the end of geopolymerisation.
The.adsorbed onto bentonite clay, leaving clean water and a heavy metal loaded clay precipitate as products. Due to the toxicity of heavy metals, the clay could not be disposed of safely in the past.
A method was thus required to remove the heavy metal content from the clay. Acid leaching was proposed to liberate the heavy metals from the loaded clay.valent iron ion in the leaching solution a er acid leaching process. e detailed information of the experiments could be found in previous studies [, ].
3. Results and Discussions e e ect of leaching time on the kinetic study of the extraction of Al 2 O 3 and Fe 2 O 3 using the hydrochloric acid solution is shown in Table. e relationship curve Cited by: 3.