Aug 16

chemical bleaching of minerals to increase whitness

US4824653A - Method of bleaching line - Google PatentsNo. 4,239,736, bleaching agents other than sodium hydrosulfite, such as zinc hydrosulfite, K-Brite - 3E, and K-Brite - 3K of the ia Chemical Company, as well as sulfur dioxide and zinc dust can also be used in the chemical reaction with iron, and particularly iron oxide. Another method of increasing the whiteness of.chemical bleaching of minerals to increase whitness,Tooth-bleaching procedures and their controversial effects: A .The bleaching mechanism in this case takes place by chemical degradation of the unsaturated quinone-type structures found in tetracycline, leading to fewer colored molecules (Feinman et al., 1991). Vital bleaching via a long-term night guard can sometimes improve the color of tetracycline-stained teeth (Leonard et al.,.

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Bleaching of kaolins and clays by chlorination of . - Semantic ScholarThe use of chlorination for iron and titanium removal from different clay and kaolin minerals, used in . Also, a thermodynamic analysis of the system using HSC Chemistry for Windows software was made. . color of the final product of the firing, achieving ceramic materials with notable whiteness, even with red clays.chemical bleaching of minerals to increase whitness,or low-concentration bleaching agents containing calcium and/or .the tooth surface, bleaching protocol used, chemical composition and pH of the . terms of either enamel hardness values or the mineral content of the enamel . Product details. High-concentration HPs. Low-concentration HPs. Whiteness. HP Maxx. Whiteness. HP Blue. Pola Office+. Opalescence. Boost. Pola Day 9.5%.

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21 Comment on chemical bleaching of minerals to increase whitness

Modification of the physico-chemical properties of udi clay mineral to .

palm oil can be reduced appreciably by adsorption process or bleaching by using clay mineral adsorbents [21]. In this work, the aim is to modify the physicochemical properties of local clay from Udi (Nigeria) to enhance its adsorptive capacity. This was achieved by calcination and acid activation of the clay mineral.

Safety issues of tooth whitening using peroxide-based materials

of the tooth structure, increasing its per- ception of whiteness. On the other hand, whitening is the process resulting in the material becoming similar in colour to . use of chemicals, sometimes in combination . In-office tooth whitening using hydrogen peroxide (H2O2) has been practised in dentistry without significant safety.

US4824653A - Method of bleaching line - Google Patents

No. 4,239,736, bleaching agents other than sodium hydrosulfite, such as zinc hydrosulfite, K-Brite - 3E, and K-Brite - 3K of the ia Chemical Company, as well as sulfur dioxide and zinc dust can also be used in the chemical reaction with iron, and particularly iron oxide. Another method of increasing the whiteness of.

Susceptibility of Enamel Treated with Bleaching Agents to Mineral .

Jun 7, 2011 . There are also some reports that bleaching agents promote chemical and microstructural changes in enamel, similar to initial caries lesions [16, 19], but it has ... It was noted that light irradiation increased the calcium loss for Whiteness HP Maxx but that there were no effects observed for Pola Office and.

Bleaching of kaolins and clays by chlorination of . - Semantic Scholar

The use of chlorination for iron and titanium removal from different clay and kaolin minerals, used in . Also, a thermodynamic analysis of the system using HSC Chemistry for Windows software was made. . color of the final product of the firing, achieving ceramic materials with notable whiteness, even with red clays.

or low-concentration bleaching agents containing calcium and/or .

the tooth surface, bleaching protocol used, chemical composition and pH of the . terms of either enamel hardness values or the mineral content of the enamel . Product details. High-concentration HPs. Low-concentration HPs. Whiteness. HP Maxx. Whiteness. HP Blue. Pola Office+. Opalescence. Boost. Pola Day 9.5%.

Safety issues of tooth whitening using peroxide-based materials

of the tooth structure, increasing its per- ception of whiteness. On the other hand, whitening is the process resulting in the material becoming similar in colour to . use of chemicals, sometimes in combination . In-office tooth whitening using hydrogen peroxide (H2O2) has been practised in dentistry without significant safety.

chemical bleaching of minerals to increase whitness,

anolyte as an alternative bleach for stained cotton fabrics

Chemicals like sodium hypochlorite, sodium hydroxide and various dyes are commonly used in the processing and specifically in the bleaching of cotton. ... The figure indicates that all bleach liquids removed the soot/mineral oil as time increased; however, at different levels of whiteness. Soot/mineral oil was best removed.

Tooth whitening - Wikipedia

Techniques include bleaching strips, bleaching pens, bleaching gels and laser tooth whitening. Bleaching methods generally use either hydrogen peroxide or carbamide peroxide which breaks down into hydrogen peroxide. Common side effects associated with bleaching include increased sensitivity of the teeth and.

Effects of Light Activated In-office Bleaching on Permeability .

mineral change in enamel after LED/laser activated in-office . (Whiteness HP Maxx, FGM Dental Products,. Joinville, SC . increased sensitivity. Therefore, the aim of this study was to evaluate the effects of in-office bleaching associated with light emitting diode. (LED)/laser light activation on the permeability, microhardness.

Spectroscopic studies of kaolin from different Brazilian . - CiteSeerX

chemical bleaching, filtering and drying (Murray,. 2002; Wilson et al, 2006). All these steps are used to remove mineral impurities such as Fe or Ti oxides, mica and quartz. Chlorination may also be used for Fe and Ti removal (Gonzбles & Ruiz,. 2006). To improve kaolin whiteness, the beneficia- tion has to take into account.

Removing Natural Color By Chemical Reaction, E.g., Bleaching, Etc .

Search for Removing Natural Color By Chemical Reaction, E.g., Bleaching, Etc. Patents and Patent Applications (Class 426/253) Filed with the USPTO. . which process comprises adding at least one enzyme that is effective in directly converting said pigment into a form which results in increasing the whiteness of at least.

Comparison of chemical reactivity of bauxite-tailings pre-and post .

Comparison of chemical reactivity of bauxite-tailings pre- and post-calcinations and whitening bauxite-tailing . Conventional methods for whitening bauxite-tailings were ineffective. A new . The process of post-reaction calcination, on the other hand, resulted in an increase in whiteness of bauxite-tailings from 19% to 73%.

Bond Strength of Metallic Brackets After Dental Bleaching | The .

The criteria for tooth selection were intact buccal enamel surface and no pretreatment with chemical agents such as alcohol, formalin, hydrogen peroxide, or any .. Many authors5,15–18 have related bleaching to considerable changes in enamel structure, such as loss of mineral content, increased porosity, and loss of.

Effects of Combined Use of Light Irradiation and 35% Hydrogen .

Objective: The objective of this study was to evaluate the effects of the combined use of light irradiation (LIR, halogen light, or LED/diode laser) and 35% hydrogen peroxide (35%HP) on human enamel mineral content. Background Data: The use of high-intensity light has been indicated for acceleration of the rate of.

The effect of the teeth bleaching with 35% hydrogen . - Nature

The conclusion of this study was that bleaching with an in-office bleaching material containing 35% hydrogen peroxide reduced the tensile bond strength of orthodontic bracket adhesive to the enamel surface. Standards and requirements of various services are increasing day by day and dentistry is not the exception.

purification of kaolin by selective flocculation - Cetem

It was possible to diminish TiO2 content and increase kaolin brightness . In this case, physic-chemical methods have been used such as high intensity . minerals. After sedimentation step, the overflow is removed, coagulated and bleached with sodium dithionite. Behl et al.(13), in another method, propose the addition of.

Development of a Bleaching Process for a Kaolin of Industrial .

Two-level fractional factorial experimentation was thus utilized to establish the main factors having an influence on the iron removal and to define a subsequent experimental test design. The factors involved in this study were: temperature, concentration of oxalic and ascorbic acids, mineral concentration, mixing conditions,.

SODIUM SULFATE

and as a byproduct from various chemical business recovering sodium sulfate from battery 5% each; and miscellaneous, 11%. . had traditionally ranked about 47th in terms of This material is suitable for the detergent using chlorine dioxide for the bleaching process .. Top 50 Chemicals Increased Substantially in 1994.

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