- Silica gel is a
granular, porous form of silica made synthetically from sodium silicate.
Despite the name, silica gel is a solid. Silica gel is most commonly
encountered in everyday life as beads packed in a semi-permeable
plastic. In this form, it is used as a desiccant to control local
humidity in order to avoid spoilage of some goods. Because of poisonous
dopants and their very high absorption of moisture, silica gel packets
usually bear warnings for the user not to eat the contents, but to throw
them away instead.
- Silicon is the
fourteenth element of the periodic table and is a Group IVA element,
along with carbon germanium, tin and lead. Pure silicon is a dark gray
solid with the same crystalline structure as diamond. Its chemical and
physical properties are similar to this material. Silicon has a melting
point of 2570° F, a boiling point of 4271° F, and a density of 2.33
g/cm3.When silicon is heated it reacts with the halogens to form
halides. It reacts with certain metals to form silicides and when heated
in an electric furnace with carbon, a wear resistant ceramic called
silicon carbide is produced.
- The colloidal silica
has very different stabilizing by it’s own pH degree. In general the
higher the concent- ration or the smaller the particle size, the greater
the effect of change of pH. The silica sols are extraordinarily stable
at pH 2 where the zeta potential is zero and become increasingly
sensitive to electrolytes at higher pH. The particles in colloidal
silica are stable above the pH 8 that is to be seen right fig. Most of
SILIFOG® S are stands between 9 and 10.5, it means all of SILIFOG® S are
stable in constructionally. The SILIFOG® AC is stable as pH 2 , it’s the
one and only as a acidity production.
- Silica was extracted
from rice hulls by three processing routes, starting with acid treatment
followed by burning and milling. The amorphous white silica powder
showed a surface area of 260 to 480 m2/g, purity above 99% and average
particle size of 2.0 to 0.6 mm. This silica is suitable for the
preparation of mullite whiskers employing the rare earth aluminosilicate
glass technique. Due to its highly pozzolanic reaction, this prepared
silica is used as an additive in high performance concrete.
- Silicon metal is made
from the reaction of silica (silicon dioxide, SiO2) and carbon materials
like coke, coal and wood chips. Silica is typically received in the form
of metallurgical grade gravel. This gravel is 99.5% silica, and is 3 x 1
or 6 x 1 in (8 x 3 cm or 15 x 3 cm) in size. The coal is usually of low
ash content (1-3% to minimize calcium, aluminum, and iron impurities),
contains around 60% carbon, and is sized to match that of the gravel.
Wood chips are usually hardwood of 1/2 x 1/8 inch size (1 x. 3 cm size).
All materials are received as specified by the manufacturer.
- The basic process heats
silica and coke in a submerged electric arc furnace to high
temperatures. High temperatures are required to produce a reaction where
the oxygen is removed, leaving behind silicon. This is known as a
reduction process. In this process, metal carbides usually form first at
the lower temperatures. As silicon is formed, it displaces the carbon.
Refining processes are used to improve purity.
- Colloidal silica
polishing suspensions are unique because they provide both a dispersing
action as well as a chemical mechanical polishing (CMP) action. It is
effective as an additive for the intermediate diamond polishing of
metals and is also the best polishing abrasive for eliminating
subsurface and surface damage in ceramics because of its CMP polishing
action.
- Unimin Corp. of the United States, is the largest producer
of silica in Quebec. Silica is mined from a quartzite deposit at Saint
Donat and from a sandstone deposit at Saint Canut. Most of the silica
produced by Unimin Limited originates from Saint Canut where the ore is
crushed, screened and beneficiated by magnetic separation. The
production capacity of the Saint Canut plant is about 550 000 t/y of
finished products. Most of Unimin’s output is used in the production of
glass containers, flat glass, fibreglass, and in the silicon carbide
industries.
- In 2000, Canada
imported 13.1% less silica compounds compared to 1999. Imports fell from
444 171 t to 392 743 t even though their value increased from $95
million to $102.9 million. Imports from the United States come from
loosely consolidated and easily processed sandstones or lake sand
deposits located near the Great Lakes. Major U.S. operations are located
in the states of Illinois, Wisconsin, Michigan and Indiana.
- Atlantic Silica Inc.
mines a large unconsolidated high-grade (+99% SiO2) silica deposit near
Sussex. The company produces lump silica and silica sand of various
sizes. Fine sand products are sold in the Maritimes, Quebec, and the
northeastern United States for use in sandblasting, filter sand,
traction sand, cement and concrete manufacturing, refractory use and
decorative sand, and as a flux for ase-metal smelters; the sand could
also be used in glassmaking.
- Canadian silica
production (shipments) seems to have reached a high in 1994 and a
reprieve in 1998, but has maintained a slight decline since then.
Production in Alberta has increased progressively since 1994 while
production in Quebec since 1995 and in Ontario since 1996 has remained
relatively flat.
- In 1995, imports of
silica sand for use in foundries were 373 596 t valued at $12.03
million; in 1992 they were 315 191 t valued at $5.89 million, while in
1990 they were 589 162 t valued at $8.99 million. In 1995, imports of
silica sand for use in glassmaking were 189 841 t valued at $2.94
million; in 1992 they were 101 230 t valued at $0.995 million and in
1990 they were 152 028 t valued at $1.49 million.
- Electronic applications accounted for most
industrial uses of quartz crystal; other uses included special optical
applications
- Virtually all quartz crystal used for
electronics was cultured rather than natural crystal.
- Electronic-grade quartz crystal was essential
for making filters, frequency controls, and timers in electronic
circuits employed for a wide range of products, such as communications
equipment, computers, and many consumer goods, such as electronic games
and television receivers
- Limited resources of natural quartz crystal
suitable for direct electronic or optical use are available throughout
the world. World dependence on these resources will continue to decline
because of the increased acceptance of cultured quartz crystal as an
alternative material; however, use of cultured quartz crystal will
mean an increased dependence on lascas for growing cultured quartz
- Quartz crystal is the best material for
frequency-control oscillators and frequency filters
in electronic circuits. Other materials, such as aluminum orthophosphate
(the very rare mineral berlinite), langasite, lithium niobate, and
lithium tantalate, which have larger piezoelectric coupling constants,
have been studied and used. The cost competitiveness of these materials,
as opposed to cultured quartz crystal, is dependent on the type of
application the material is used for and the processing required |
General
Information
- Silicon dioxide
- Fused quartz
- Silica gel
- Silica-Fumed
silica
- Base Silica-Gel
- Crystalline silica
primer
- Silica aerogel cellular
structures
- Introduction to
functionalized silica gel and alumina
Manufacturing
Process
- Micronized silica gel
production process
- Manufacturing process
of silicon
- Manufacturing process
of silica gel beer
- Production of silica
from ash
- Production of
precipitated silica from rice husk
- Production of silicates
and gels using of silica extracted from hydrothermal solution
- Manufacture of silica
sols from separated geothermal water
Company
Profiles
- Ananta Industries
- Bee Chems
- Daiso
- Madhu Silica
- Malpro Silica
- MLA Group
- Newburgh Specialized Chemicals
- Norinco
- Rhodia Silica Systems
- SGE Analytical Science
- Supersil Chemicals
Functions and
Properties
- Magnetic silica
colloids for catalysis
- Chemical modification
of silica surface by immobilization of functional groups
- Self-catalyzed water
reactions with silica
- Solubility of amorphous
silica in water at high temperatures and high pressures
- Shear-induced
microstructural changes in flocculated suspensions of fumed
silica
- Characteristics of
hydrophobic fumed and precipitated silica
- Characteristics of
colloidal silica
- Microstructural and
mechanical properties of silica
- Microstructure,
Interfacial interaction and properties of silica
- Structure and
properties of silica nanoclusters at high temperatures
- Properties of
pharmaceutical grade fumed silica
- Properties and
functions of untreated fumed silica
- Effect of silica sol of
different routes on the properties of low cement castables
Consultants
- CMC, Inc.
- Daniel D. Perlmutter
- Gunars Indars
- Expert in applied
silica chemistry
- John Robert
Schlup
- Meyer R. Rosen
- Stratum Resources
Material Safety Data
Sheet
- Silicon
- Si-coat
- Untreated fumed
silica
- Silicon atomic
absorption standard
- Silicon carbide
powder
- SF1 Polishing
Fluid
- Silica Fume,
Amorphous
- Silicone Vacuum
Grease
- Silica gel
- Iron Base Magnetic
Core
Applications
- Silicon: An overlooked
trace mineral
- Applications of rice
hull-derived Silica
- Working of silica
fume
- Industrial silica
applications
- Silicas for battery
separators
- Silicate in leather
production
- Colloidal silica
polishing
- Moisture sensitive
component storage
- Stain–resistant sol–gel
silica coatings on stoneware tile
- Silica suspension and
coating developments for advanced LIGO
- Rare earth low silica
glasses for optical applications
- Improving GTA weld
penetrations in aluminium alloys through silica applications
- Polymer-Silica
nanoparticles composite films as protective coatings for stone-based
monuments
- Fumed silica in
cosmetic and personal care products
- Silica gel as carrier
in controlled drug delivery in tissue administration
- Colloidal silica as a
nanostructured binder for refractory castables
Projects and Case
Studies
- The Artemis
project
- Fumed silica China
Project
- Co-production of silica
from geothermal fluids
- Crystalline
silica exposure assessment Project
- Chemical behaviour of
geothermal silica after precipitation from geothermal fluids
- Silica extraction at
the Mammoth lakes geothermal site
- Chlorine free
technology for solar-grade silicon manufacturing
- The nature of the
acidity of amorphous silica-alumina catalyst support and its role in the
hydrotreating process
- Assessment of the
carcinogenic effect of silica dust
- Biofabrication of
nanostructured silica and use of enzymes involved in metabolism of
biogenic silica
- Project on the status
of silica dust and noise exposure in the mining industry
- Silica used as filler
in rubber matrix
- Membrane filtration of
colloidal silica
- Case
study:Silica
- Harnessing the power of
a grain of sand
- Batteries for advanced
transportation technologies program
- Reaction Mechanism of
Magnesium Silicates with Carbon Dioxide in Microwave Fields
- Demonstration of
amended silicates for mercury control at Miami fort unit 6
- Preparation of High
Purity Silica Glass by Hydrogel Technique
- Preparations of Silica
Slurry for Wafer Polishing via Controlled Growth of Commercial Silica
Seeds
|
Patent
- Silica
- Silanized Silica
- Silica gel
- Doped precipitated
silica
- Method of Making
Colloidal Silica
- Defluorination of fumed
silica
- Aqueous colloidal
dispersion of fumed silica without a stabilizer
- Method of generating an
aqueous suspension of colloidal silica
- Integration of ceramic
membrane into a silicon oxide production plant
- Ultrapure colloidal
silica for use in chemical mechanical polishing applications
- Use of silica as agent
for controlling the degradation of bicarbonate, resulting mixture and
its application
Technology
- Commercial silica
production from geothermal brines
- Large-scale production
of titania nano-coated silica-gel beads by fluidized bed chemical vapor
deposition
- Increasing the
compactability of echinacea purpurea powder using starch 1500® and fumed
silica
- POU filtration of
silica-based CMP slurries
- Silica free foundry at
silica sand prices
- Stabilization of
colloidal silica using small polyols.
- Colloidal
polystyrene-silica hybrid particles prepared via alcoholic dispersion
polymerisation
- Development of porous
silica production by hydrothermal method
- Detection of decay in
wood treated with modified oil
Products
- Ultrafine silica
gels
- Aerosil and
silanes
- AVSil Laminated/Coated
Silica Fabrics
- AVSil Silica
Textiles
- PPG Silica
Products
- Rhodia silica
products
- Silica products from
Fisher Scientific
Plants
- ABB Limited Silica
analyzers
- EMD Chemicals silica
gels production plant
- Makall group silica
production plant
- Qingdao Haiyang Chemical Plant
- Vilnius Silica Brick
Plant
- Degussa Expands Silane
Capacity-New Production Plant for Solar Silicon
Market and
Report
- Market demand of
silica
- Overview of market of
silica
- Overview of silica sand
market
- Overview of
precipitated silica market
- Biogenic silica
accumulation in the sediments of iron Gate I reservoir on the Danube
river
- Innovation in
traditional CMP applications
- Degussa developed
silica- silane technology
- Silica in drinking
water
- Novel Processing route
to Fabricate Low Cost Fused Silica Ceramic Foam
- Machery- Nagel
Report
- Degussa annual report
2007
- Wacker chemie AG annual
report
- The Nebraska State
Recycling Association report
- Study of a novel silica
gel
- Silica fume resurges
report
- Nalco annual
report
- NewCo Pharmaceuticals
LLC report
- Taking corporate
responsibility seriously
- The silica industry in
the republic of South Africa
- Specialty silica
summit
- Silica Saudi Arabia - 2006
-
Silica/Quartz - Canada 2006
- Silica market in
2002
- Silica market in
2003
- Silica market in
2004
- Silica market in
2005
- Silica market in 2006
- Silica Data - 2007
- Silica Data - 2008
- Silica Data - 2009
- Silica Data - 2010
- Industrial Quartz Crystal - 2009
- Industrial Quartz Crystal - 2010
- Industrial Quartz Crystal - 2011
- Industrial Quartz Crystal - 2012
- Quartz Crystal ( Industrial) 2008
- Quartz Crystal ( Industrial) 2007
- Quartz Crystal ( Industrial) 2007 & 2008
- Sand & Gravel ( Industrial) 2000 to 2008
Manufacturers and
Suppliers
Colloidal
Silica
- Suppliers of colloidal
silica in Maharashtra
- China suppliers of
colloidal silica
- Indian exporters of
colloidal silica
- Suppliers of colloidal
solutions and nanoparticles
- Sell trade leads of
colloidal silica
- Selling leads of
colloidal silica
- Colloidal silica
suppliers
Fumed Silica
- China suppliers of
fumed silica
- Foreign exporters of
fumed silica
- Indian exporters of
fumed silica
- Selling leads of fumed
silica
- Sell offers of fumed
silica
- Sell trade leads of
fumed silica
Silica Gel
- China suppliers of
silica gel
- Silica gel
exporter
- Indian exporters of
silica gel
- Silica gel
manufacturers directory
- Selling leads of silica
gel
- Silica gel
suppliers
Precipitated Silica
- Kunal Chemical
Company
- China suppliers of
precipitated silica
- Precipitated Silica
suppliers in Maharashtra
- Precipitated Silica
manufacturers
- Selling leads of
Precipitated Silica
- Precipitated Silica
suppliers
Buyers
- Jay Chem
Marketing
- Foreign importers of
precipitated silica
- Indian importers of
precipitated silica
- Foreign importers of
silica gel
- Indian importers of
silica gel
- Silica gel buy
offers
- Foreign importers of
fumed silica
- Indian importers of
fumed silica
- Silica buyers list
1
- Silica buyers list
2
Equipment
Suppliers
- Bogging machine
suppliers
- Convenyor Belt suppliers
- Suppliers of cyclone
separator
- Silica filter
manufacturers
- Fluid energy mill
suppliers
- Mixing unit
suppliers
- Vaccum feeder
manufacturers
- Washing/Drying unit
manufacturers
- Water vessel
suppliers
Safety and Guides
- Minerals Planning
Guidance
- Fumed silica and fumed
alumina application and selection guide
- Working safely with
untreated fumed silica
- Hazard recognition of
silica
- Silica dust exposures
can cause silicosis
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