معلومات عن التلك والرخام
صفحة 1 من اصل 1
معلومات عن التلك والرخام
Admin الثلاثاء أكتوبر 28, 2008 4:09 pm
Talc carbonate
is a geologic term for a suite of rock and mineral compositions found in metamorphic ultramafic rocks.
The term refers to the two most common end-member minerals found within ultramafic rocks which have undergone talc-carbonation or carbonation reactions, talc and the carbonate mineral magnesite.
Talc carbonate mineral assemblages are controlled by temperature and pressure of metamorphism and the partial pressure of carbon dioxide within metamorphic fluids, as well as by the composition of the rock
.
[edit] Compositional controls
In a general sense, talc carbonate metamorphic assemblages are diagnostic of the magnesium content of the ultramafic protolith.
• Lower-magnesian ultramafic rocks (12-18% MgO as a rule of thumb) tend to favor talc-chlorite assemblages
• Medium-MgO rocks (15-25% MgO) tend to produce talc-amphibole assemblages.
• High-MgO rocks with in excess of 25% MgO tend to form true talc-magnesite metamorphic assemblages.
Thus, the MgO content of a metamorphosed ultramafic rock can be estimated roughly by understanding the mineral assemblage of the rock. Magnesium content determines the proportion of talc and/or magnesite and aluminium-calcium-sodium content determines the proportion of amphibole and/or chlorite.
[edit] Talc Carbonate Minerals
Several minerals are diagnostic of talc carbonated ultramafic rocks;
• Talc
• Chlorite, generally magnesian bluish-green
• Tremolite-Cummingtonite-Grunerite amphiboles in greenschist facies rocks
• Anthophyllite-Cummingtonite amphibole in weakly carbonated serpentinite at greenschist facies or very rarely, uncarbonated amphibolite facies serpentinites
• Magnesite, and rarely dolomite in association with amphibolitic compositions
At amphibolite facies, the diopside-in isograd is reached (dependent on carbon dioxide partial pressure) and metamorphic assemblages trend toward talc-pyroxene and eventually toward metamorphic olivine.
About Talc
Today world is globalized and manufacturing companies & producers of consumer goods to industrial products, such as paints, plastics, ceramics, or cosmetics.
Talc is a mineral that is mined in many different countries of the world & being a natural product its composition varies between occurrences. Moreover, there is a great number of ways to process talc during micronization. Thus, differences in application are significant both by virtue of mineralogy and grinding. We believe that offering only specialized services such as product applications to Polymer and coatings companies. In a way that preserves the talc splat structure and ensures a constant particle distribution.
Z-TALC products are made from material occurring at Northern part of India. The raw material is ground on three stages and processed thereafter choosing applications and product characteristics.Consequently Z- Talc products are the very quality talc raw material available for our customers with guaranteed quality and service.
Types of Talc
• The term "talc" does not express the diversity of this mineral in nature. On the one hand, "talc" is a pure magnesium-silicate, on the other hand. It is a general term for a polynomial rock.
• Pure talc has the chemical formula: Mg3 Si4O10(OH)2. The theoretical chemical analysis shows the following values.
• Sio2 - 6.35%
• Mgo - 31.7%
• H2O - 4.8%
• Talc is most frequently accompanied by "chlorite" where the Mg²-ion has been substituted by Al³ - or Fe³ ions (France, Austria, Italy, USA etc.). To compensate the different loadings of the Al³± or Fe³± - ions compared to the Mg² - ion, an additional Brucite - layer is added at the Chlorite.
• Chlorite has a lamellar structure as well, with similar properties as pure talc in most of the typical applications. The theoretical formula is (Mg Al.Fe)12 (Si,Al)8O20 (OH)16. The typical colour is green (chloros = light green ) to opaque.
• At the chlorite talc lattice, Mg²+ is substituted by Al³+ or Fe³+. To compensate the different loadings of the Al³ or Fe³+ - ions compared to the Mg²+-ion an additional Brucite-layer is added at he chlorite modification. The Fe³± ion of a chlorite talc is mainly linked to the chlorite- layer, where a part of the Al³+ is substituted. The layers are electro-neutral. Therefore, also combinations of talc and chlorite-type are possible and are regularly found in particle.
• Steatite is a fairly compact modification or talc. Soapstone describes impure black talcs.
• A talc crystal is like a microscopic booklet in which each page is composed of a tin layer of Mg-hydroxide sandwiched between two layers of tetrahedral silica.
Pure talc is characterized by its hydrophobic properties, its slipperiness of surface, and the lowest Moh's hardness of 1. The softness of talc is due to the fact that the layers can easily be shifted and separated. The smooth, hydrophobic, water repellent surface slide against one another, giving talc its slippery and fatly feel. Commercial talc grades are harder due to impurities.
Other by-minerals found are as follows:
Carbonates Magnesite Finland, Italy, Canada,China
Dolomite France, Austria, Italy,USA, China,.
Canada
Calcite India
Mica, Serizite Austria, South Africa
Quartz Austria, France, China,Australia
Serpentine Canada, China
Tremolite USA, China, Sweden
• Part from the mineralogy, talc and chlorite deposits are classified by brightness and their aspect ratio. The lamellar talc is the most common modification (e.g. Haicheng & Guangxi (China). Jaipur (India), Mount Seabrook (Australia), Luzenac (France), Pinerlo (Italy ). The compactly structured talc very rarely occurs in Europe (Germany, Spain), the main deposit is Australia. This micro-crystalline type of talc is mainly used for electroceramics and paper.
• Crude talc colors are grey to green and pink, rarely white. Most European and north American talc deposits are of low and medium brightness. White talc deposits of significant dimension can be found in Asia and Australia.
• Pure talc remains unaltered in the presence of chemical regents.Carbonate and chlorite containing types have a higher solubility in acids.
• Hi Talc products are pure minerals with very low levels of impurities. The lamellarity of the mineral is distinct. The colour is slightly green as a crude ore. If ground, the powder becomes very bright
Our specifications are:-
Pure Talc:
Whiteness Ymin 95 aT40 um
Solubi lity in aciel 1.3%
Free silico 1.5%
With my best wishes
Kol.officer.doctor
Bahaa badr el-din mahmoud
Technolab el-bahaa group
is a geologic term for a suite of rock and mineral compositions found in metamorphic ultramafic rocks.
The term refers to the two most common end-member minerals found within ultramafic rocks which have undergone talc-carbonation or carbonation reactions, talc and the carbonate mineral magnesite.
Talc carbonate mineral assemblages are controlled by temperature and pressure of metamorphism and the partial pressure of carbon dioxide within metamorphic fluids, as well as by the composition of the rock
.
[edit] Compositional controls
In a general sense, talc carbonate metamorphic assemblages are diagnostic of the magnesium content of the ultramafic protolith.
• Lower-magnesian ultramafic rocks (12-18% MgO as a rule of thumb) tend to favor talc-chlorite assemblages
• Medium-MgO rocks (15-25% MgO) tend to produce talc-amphibole assemblages.
• High-MgO rocks with in excess of 25% MgO tend to form true talc-magnesite metamorphic assemblages.
Thus, the MgO content of a metamorphosed ultramafic rock can be estimated roughly by understanding the mineral assemblage of the rock. Magnesium content determines the proportion of talc and/or magnesite and aluminium-calcium-sodium content determines the proportion of amphibole and/or chlorite.
[edit] Talc Carbonate Minerals
Several minerals are diagnostic of talc carbonated ultramafic rocks;
• Talc
• Chlorite, generally magnesian bluish-green
• Tremolite-Cummingtonite-Grunerite amphiboles in greenschist facies rocks
• Anthophyllite-Cummingtonite amphibole in weakly carbonated serpentinite at greenschist facies or very rarely, uncarbonated amphibolite facies serpentinites
• Magnesite, and rarely dolomite in association with amphibolitic compositions
At amphibolite facies, the diopside-in isograd is reached (dependent on carbon dioxide partial pressure) and metamorphic assemblages trend toward talc-pyroxene and eventually toward metamorphic olivine.
About Talc
Today world is globalized and manufacturing companies & producers of consumer goods to industrial products, such as paints, plastics, ceramics, or cosmetics.
Talc is a mineral that is mined in many different countries of the world & being a natural product its composition varies between occurrences. Moreover, there is a great number of ways to process talc during micronization. Thus, differences in application are significant both by virtue of mineralogy and grinding. We believe that offering only specialized services such as product applications to Polymer and coatings companies. In a way that preserves the talc splat structure and ensures a constant particle distribution.
Z-TALC products are made from material occurring at Northern part of India. The raw material is ground on three stages and processed thereafter choosing applications and product characteristics.Consequently Z- Talc products are the very quality talc raw material available for our customers with guaranteed quality and service.
Types of Talc
• The term "talc" does not express the diversity of this mineral in nature. On the one hand, "talc" is a pure magnesium-silicate, on the other hand. It is a general term for a polynomial rock.
• Pure talc has the chemical formula: Mg3 Si4O10(OH)2. The theoretical chemical analysis shows the following values.
• Sio2 - 6.35%
• Mgo - 31.7%
• H2O - 4.8%
• Talc is most frequently accompanied by "chlorite" where the Mg²-ion has been substituted by Al³ - or Fe³ ions (France, Austria, Italy, USA etc.). To compensate the different loadings of the Al³± or Fe³± - ions compared to the Mg² - ion, an additional Brucite - layer is added at the Chlorite.
• Chlorite has a lamellar structure as well, with similar properties as pure talc in most of the typical applications. The theoretical formula is (Mg Al.Fe)12 (Si,Al)8O20 (OH)16. The typical colour is green (chloros = light green ) to opaque.
• At the chlorite talc lattice, Mg²+ is substituted by Al³+ or Fe³+. To compensate the different loadings of the Al³ or Fe³+ - ions compared to the Mg²+-ion an additional Brucite-layer is added at he chlorite modification. The Fe³± ion of a chlorite talc is mainly linked to the chlorite- layer, where a part of the Al³+ is substituted. The layers are electro-neutral. Therefore, also combinations of talc and chlorite-type are possible and are regularly found in particle.
• Steatite is a fairly compact modification or talc. Soapstone describes impure black talcs.
• A talc crystal is like a microscopic booklet in which each page is composed of a tin layer of Mg-hydroxide sandwiched between two layers of tetrahedral silica.
Pure talc is characterized by its hydrophobic properties, its slipperiness of surface, and the lowest Moh's hardness of 1. The softness of talc is due to the fact that the layers can easily be shifted and separated. The smooth, hydrophobic, water repellent surface slide against one another, giving talc its slippery and fatly feel. Commercial talc grades are harder due to impurities.
Other by-minerals found are as follows:
Carbonates Magnesite Finland, Italy, Canada,China
Dolomite France, Austria, Italy,USA, China,.
Canada
Calcite India
Mica, Serizite Austria, South Africa
Quartz Austria, France, China,Australia
Serpentine Canada, China
Tremolite USA, China, Sweden
• Part from the mineralogy, talc and chlorite deposits are classified by brightness and their aspect ratio. The lamellar talc is the most common modification (e.g. Haicheng & Guangxi (China). Jaipur (India), Mount Seabrook (Australia), Luzenac (France), Pinerlo (Italy ). The compactly structured talc very rarely occurs in Europe (Germany, Spain), the main deposit is Australia. This micro-crystalline type of talc is mainly used for electroceramics and paper.
• Crude talc colors are grey to green and pink, rarely white. Most European and north American talc deposits are of low and medium brightness. White talc deposits of significant dimension can be found in Asia and Australia.
• Pure talc remains unaltered in the presence of chemical regents.Carbonate and chlorite containing types have a higher solubility in acids.
• Hi Talc products are pure minerals with very low levels of impurities. The lamellarity of the mineral is distinct. The colour is slightly green as a crude ore. If ground, the powder becomes very bright
Our specifications are:-
Pure Talc:
Whiteness Ymin 95 aT40 um
Solubi lity in aciel 1.3%
Free silico 1.5%
With my best wishes
Kol.officer.doctor
Bahaa badr el-din mahmoud
Technolab el-bahaa group
Admin- Admin
- المساهمات : 20
تاريخ التسجيل : 28/10/2008
العمر : 56
الموقع : www.technolabelbahaagp.alibaba.com -
صفحة 1 من اصل 1
صلاحيات هذا المنتدى:
لاتستطيع الرد على المواضيع في هذا المنتدى