Study on the Kaolin Fine Tailings Refined Bleached Process

2012 ◽  
Vol 550-553 ◽  
pp. 2917-2920
Author(s):  
Chun Hua Liu ◽  
Zhi Hua Liu ◽  
Chang Bin Xia
Keyword(s):  
Citric Acid ◽  
Oxalic Acid ◽  
Ferric Oxide ◽  
Low Ph ◽  
Aluminum Silicate ◽  
Acid Acid ◽  
Fine Tailings ◽  
The Difference ◽  
Water Cut ◽  
Different Sources

Kaolin is a mineral composition of water cut aluminum silicate collection of words, used widely. But since most kaolin contain quality score 0.5% ~ 3% of iron oxide or hydrogen ferric oxide, restricted its use. With reduction and complexation method to kaolin bleach, which can effectively reduce the content of iron in the clay. The low pH in with organic acid(citric acid, acid, oxalic acid, also sugar) refined bleached high content of coal kaolin ferric oxide. The results show that, citric acid and also the sugar acid in iron effect is poor, does not meet the industrialized production, oxalic acid can remove kaolin can dip in iron, when pH lower than 1.2, the temperature of 80 °C on the bleaching, white degree of more than 80%, to adapt to the industrial application of coal kaolin basic conditions. At the same time, because of the difference of shading minerals, different sources of kaolin bleaching and the white degree stability condition is different, the actual production of should according to the specific of the sources, after the test to be sure.

scholarly journals Effect of Citric Acid on Color Changes of Calcium Silicate-Based Cements an In Vitro Study

2021 ◽  
Vol 11 (5) ◽  
pp. 2339
Author(s):  
Joanna Metlerska ◽  
Till Dammaschke ◽  
Mariusz Lipski ◽  
Irini Fagogeni ◽  
Anna Machoy-Mokrzyńska ◽  
...  
Keyword(s):  
Citric Acid ◽  
Calcium Silicate ◽  
In Vitro Study ◽  
Vitro Study ◽  
Color Measurement ◽  
Color Changes ◽  
Naked Eye ◽  
Root Canal Irrigants ◽  
The Difference

The aim of the present in vitro study was to investigate the effects of 10% and 40% citric acid (CA) on the color of calcium silicate–based cements (CSCs) in comparison to the effects of common root canal irrigants. Samples of six CSCs (n = 6)—ProRoot MTA (Dentsply, Tulsa, OK, USA), Biodentine (Septodont, Saint-Maur-des-Fossés, France), MTA Plus (Avalon Biomed Inc, by Prevest Denpro Limited, Jammu, India), MTA Repair HP (Angelus, Londrina, PR, Brazil), Ortho MTA (BioMTA, Seoul, Korea), and Retro MTA (BioMTA, Seoul, Korea)—were immersed in 10% and 40% CA as well as 15% EDTA, 2% NaOCl, 2% CHX, and 0.9% NaCl for 15 min, 1 h, and 24 h. ΔE values, representing the difference between the final and baseline values of the color components, were then determined using a VITA Easyshade Compact 5.0 spectrophotometer. Naked-eye evaluation of the changes in color and structures of the materials was performed using our own scale. Upon immersion of the materials in both 10% and 40% CA, there were statistically significant differences between spectrophotometric color measurement results for all CSCs (P < 0.05). However, CA does not cause dark discoloration, observable with the naked eye, of any of the materials, such as NaOCl and CHX. Significant statistical differences were also found between all CSCs in terms of submersion duration (P < 0.05). CA, which could be an alternative to EDTA use, caused greater CSCs discoloration and changed some of their structures. Unless required by the therapeutic procedure, clinicians should pay attention to the fact that the irrigant may affect the CSCs discoloration and minimize the contact time of irrigant with CSCs.

scholarly journals 2. On the Polarizability of Heat from different Sources

1845 ◽  
Vol 1 ◽  
pp. 334-334
Author(s):  
Forbes
Keyword(s):  
Low Temperature ◽  
The Difference ◽  
Different Sources

The author of this paper states in it his belief, that the curious fact formerly announced to the Society of the greater permeability of mica, laminated by heat, to heat of low temperature, contrary to the usual character of the same substance (a property which he has since extended (see Proceedings, Jan. 1840) to changes of mechanical conditions of surface), may very probably explain, as M. Melloni anticipates, the difference in point of fact long contested between them as to the equal or unequal polarizability of heat from different sources.

scholarly journals Compositional Changes during the Fruit Development of Two Peach Cultivars Differing in Juice Acidity

1998 ◽  
Vol 123 (5) ◽  
pp. 770-775 ◽  
Author(s):  
Annick Moing ◽  
Laurence Svanella ◽  
Dominique Rolin ◽  
Monique Gaudillère ◽  
Jean-Pierre Gaudillère ◽  
...  
Keyword(s):  
Citric Acid ◽  
Fruit Development ◽  
Prunus Persica ◽  
Sucrose Concentration ◽  
Titratable Acidity ◽  
The Difference ◽  
Normal Acidity ◽  
Vacuolar Ph ◽  
C Nmr

Changes in metabolites were studied during the fruit development of two greenhouse grown peach [Prunus persica (L.) Batsch] cultivars with low acidity (`Jalousia') or normal acidity (`Fantasia'). Both cultivars had the same sucrose concentration in fruit mesocarp at maturity. In the fruit juice, pH was higher and titratable acidity was lower for `Jalousia' than for `Fantasia' from 80 days after bloom to maturity. At four different times during fruit development, in vivo 13C NMR spectroscopy was used to measure the vacuolar pH of fruit mesocarp. At 55 days after bloom, the vacuolar pH of fruit mesocarp was not significantly different between `Jalousia' and `Fantasia', whereas the juice pH was different between cultivars. The three major organic acids in fruit mesocarp were malic, citric, and quinic acids for both cultivars. Citric acid concentrations were similar in both cultivars until ≈85 days after bloom and then became significantly higher in `Fantasia'. A significantly higher concentration in malic acid in `Fantasia' than in `Jalousia' was observed from the end of the first growth phase to maturity. At maturity, `Fantasia' fruit had two and five times more malic and citric acid, respectively, than `Jalousia' fruit. The differences observed between `Jalousia' and `Fantasia' fruit for malic and citric acid concentrations accounted for the difference in titratable acidity. The differences in acid concentration appeared during the plateau between the two rapid growth phases of the fruit, i.e., far before the onset of maturation. The three major amino acids were asparagine, glutamic acid, and proline for both cultivars. Their concentration followed similar patterns in acid and low-acid fruit.

A Review of Maslahah Mursalah and Maqasid Shariah as Methods of Determining Islamic Legal Ruling

2021 ◽  
Vol 12 (3) ◽  
pp. 2994-3001
Author(s):  
Muhammad Nazir Alias Et.al
Keyword(s):  
Islamic Law ◽  
Legal Principles ◽  
Legal Principle ◽  
Difference Of Opinion ◽  
The Difference ◽  
Different Sources

The position of maqasid shariah as reference for Islamic legal ruling has been a source of dissenting opinions among contemporary ulama. Some of them accept maqasid shariah as a method of determining legal principles, whereas others do not. In classical usul fiqh literature, the discourse on maqasid shariah among the ulama only appears in discussions on the position of maslahah mursalah as a method of determining Islamic legal ruling. In light of this, the issue arises when the position of maqasid shariah, specifically as a source of law, is not mentioned by classical ulama. Therefore, a small number of scholars are of the view that maqasid Shariah is not clearly applied in the process of determining legal ruling, such as what had happened in the Shafie school of law. This article aims to review the concept of maslahah mursalah and maqasid shariah in the context of its status as a method of determining Islamic legal ruling. The findings of the study show that maslahah mursalah is not maqasid shariah because both of them originate from different sources. The rejection of maslahah mursalah by some ulama does not refer to maslahah that is in line with the higher objectives of Islamic law (maqasid shariah), but refers to maslahah that relies solely on logic and intellect. The difference of opinion among contemporary ulama regarding the position of maqasid shariah as a method of determining legal principle stems from confusion in defining and categorising maslahah mursalah and maqasid shariah.

The synergistic mechanisms of citric acid and oxalic acid on the rapid dissolution of kaolinite

2020 ◽  
Vol 196 ◽  
pp. 105756 ◽  
Author(s):  
Shao-Min Lin ◽  
Ya-Ling Yu ◽  
Zhi-Jie Zhang ◽  
Chen-Yang Zhang ◽  
Ming-Feng Zhong ◽  
...  
Keyword(s):  
Citric Acid ◽  
Oxalic Acid ◽  
Rapid Dissolution

Effect of pH on metabolism of alpha-ketoglutarate by renal cortical mitochondria

1981 ◽  
Vol 240 (2) ◽  
pp. F120-F126 ◽  
Author(s):  
R. L. Tannen ◽  
A. S. Kunin
Keyword(s):  
Low Ph ◽  
Alkaline Ph ◽  
Glutamine Concentration ◽  
Acid Base ◽  
Experimental Conditions ◽  
Effect Of Ph ◽  
Adaptive Changes ◽  
Overall Response ◽  
Per Se ◽  
The Difference

The effect of acid-base perturbations on mitochondrial alpha-ketoglutarate (alpha-KG) metabolism was quantitated by measuring the nitrogen and carbon metabolites of glutamine. alpha-KG metabolized was calculated as the difference between alpha-KG production from glutamine (glutamate deamination plus transamination) and alpha-KG accumulation in the medium. Under all experimental conditions accumulation in the medium of malate plus aspartate was altered similarly to the calculated change in alpha-KG metabolism. Mitochondria from rats with chronic acidosis were compared to pair-fed controls. Chronic acidosis resulted in increased alpha-KG production and its intramitochondrial concentration; the rate of conversion of alpha-KG to succinate was unchanged. When mitochondria from normal animals were incubated at pH 7.0, 7.4, and 7.7, the amount of alpha-KG metabolized was altered, but the magnitude and direction of the response was dependent on the concentration of glutamine (0.5, 1.0, or 5.0 mM). A low pH depressed production but stimulated the subsequent metabolism of alpha-KG, whereas an alkaline pH acted in the opposite fashion. The overall response at a given glutamine concentration depended on which effect predominated. Accordingly, chronic acidosis does not induce adaptive changes, but pH, per se, directly alters intramitochondrial alpha-KG metabolism.

scholarly journals Oxalic acid production by Aspergillus niger: an oxalate-non-producing mutant produces citric acid at pH 5 and in the presence of manganese

Microbiology ◽  
1999 ◽  
Vol 145 (9) ◽  
pp. 2569-2576 ◽  
Author(s):  
George J. G. Ruijter ◽  
Peter J. I. van de Vondervoort ◽  
Jaap Visser
Keyword(s):  
Citric Acid ◽  
Aspergillus Niger ◽  
Oxalic Acid ◽  
Acid Production
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