G r a p h i t e D i s p e r s i o n s
T e c h n i c a l I n f o r m a t i o nGraphit Kropfmühl / AMG Mining AG
Graphit Kropfmühl / AMG Mining AG has more than
140 years of tradition and expertise in raw materials.
With our permanent will to create, market proximity
and absolute customer orientation we have become a
trend-setting graphite refiner. On the basis of state-of-
the-art, quality-conscious high technology and in an
intensive dialogue with customers and partners, we
develop high-quality special products. In order to secure
the supply of raw materials we hold shares in mines
located in Africa, Asia and Europe.
Our leading position as an internationally operating,
listed graphite specialist is both motivation and
obligation. Extensive research and development work
guarantees a permanent optimisation of our product
range and allows us to fulfil specific customer wishes.
07/
2013
www.gk-graphite.com
Natural Graphite
SyntheticGraphite
AmorphousGraphite
GraphiteParts
ExpandableGraphite
GraphiteDispersions
PORTFO
LIO
A member of Advanced Metallurgical Group N.V.
A member of Advanced Metallurgical Group N.V.
Contact: AMG Mining AG 94051 Hauzenberg , Langheinrichstraße 1 , Germany Tel.: +49 8586 609-178, Fax: +49 8586 609-112 e-mail: [email protected], web: www.gk-graphite.com
Contact: Zimbabwe German Graphite Mines (PTY) Limited90 Mutare Road Msasa, Harare / Zimbabwe Tel.: +49 8586 609-178, Fax: +49 8586 609-112 e-mail: [email protected], web: www.gk-graphite.com
Contact: Bogala Graphite Lanka Ltd. No 20 Tickell Road, Colombo 08 , Sri Lanka Tel.: +94 112 696-146, Fax: +94 112 698-708 e-mail: [email protected], web: www.gk-graphite.lk
Contact: Qingdao Kropfmuehl Graphite Ltd.Room 2502, Entrance 2, Building 2, Dragon Plaza No. 19 Miaoling Road, Laoshan District, QingdaoShandong Province 266061, P.R. ChinaTel.: +86 532 88967200, Fax: +86 532 88967100 e-mail: [email protected], web: www.gk-graphite.cn
Contact: AMG Mining AG 22880 Wedel , Von-Linne-Straße 7-11 , Germany Tel.: +49 8586 609-178, Fax: +49 8586 609-112 e-mail: [email protected], web: www.gk-graphite.com
Contact: Edelgraphit GmbH 53175 Bonn , Friesdorfer Straße 242 , Germany Tel.: +49 228 310236, Fax: +49 228 313026 e-mail: [email protected], web: www.edelgraphit.de
Contact: Graphite Týn, spol. s r.o.Písecká 417, 37501 Týn nad Vltavou, Czech RepublicTel.: +420 385 109210, Fax: +420 385 109210e-mail: [email protected], web: www.gk-graphite.cz
Sri Lanka
Zimbabwe
Qingdao
Wedel (b. Hamburg)
BonnTýn
Kropfmühl
AMG Mining AG, Kropfmühl, Germany
Corporate headquarters of GK group.processing of natural graphite, centre of excellence for graphite, R&D centre, administration of GK group
flotationpurification plant wide range of milling facilitiessieving and homogenisation plantproduction of dry graphite blendsproduction of graphite dispersions
AMG Mining AG, Wedel, Germany
storing, homogenisation and screening of natural and expandable graphite grades
Edelgraphit GmbH, Bonn, Germany
production of lubricants and graphite dispersionsmachining of graphite partscustomised graphite specialitiesproduction of ready-to-use graphite parts
Graphite Týn spol. s r.o., Týn, Czech Republic
processing of synthetic and special Sri Lankan vein graphiteprocessing of natural graphitepurification plantmilling facilitiessieving operationproduction of lubricants and graphite dispersions
Qingdao Kropfmuehl Graphite Ltd.Qingdao, Shandong Province, P.R. China
purification plantsieving and homogenisation plantproduction of graphite dispersionsmilling facilitiesprocessing of natural and synthetic graphite
Bogala Graphite Lanka Ltd., Bogala, Sri Lanka mining and processing of vein graphite
underground miningflotation plantmilling facilitiessieving operationlubricant plant
Zimbabwe German Graphite Mines Ltd., Zimbabwe
underground miningflotation plant sieving operation
Graphite
Like diamond, natural graphite is a modification of
carbon. The basic structure of graphite consists of a
hexagonal arrangement of carbon atoms which form
stable planar lattices with only weak inter-layer bonding
(Van der Waals forces).
The unique properties of graphite resulting from its
distinctive layered structure and chemical inertness
make it the material of choice in many applications.
Properties of graphite
Excellent electrical and thermal conductivity
Excellent lubricating properties particularly at
elevated temperatures and pressures
High oxidation resistance and immunity against
aggressive chemicals
Environmentally friendly
Graphite dispersions
Many years of experience in the field of graphite
dispersions has continuously increased the quality and
performance of the Graphit Kropfmuehl products in the
market. Being a graphite refiner with own mines, we
have total control over the performance indicators in our
formulations. Choosing the right raw material source in
combination with the matching subsequent process, we
are able to offer dispersion products for a wide variety of
applications.
What is a dispersion?
A mixture of a minimum of two different materials
Single phases can be clearly defined and can
normally be separated by physical means
A dispersion of a solid in a liquid is called a
suspension. In the case of graphite the designation
“dispersion” is universial
Dispersed solid particles that are < 1 µm are known
as colloidal dispersions
Fields of application
Graphite dispersions are used in applications that
require a uniform and fine distribution of graphite
within the carrier material.
Depending on each individual application, the following
dispersion properties are of decisive importance:
Sedimentation stability, surface tension, wetting
behavior on different surfaces, adhesive power on
different surfaces, drying time, viscosity, pH-value, and
ionogenity.
In order to improve the dispersing effect, tailor-made
formulations, apart from graphite and the dispersion
agent (in most cases water), also contain protective
colloids, preserving agents, and other
additives. Graphite dispersions can be individually
produced for any application.
The main fields of application are:
Graphite dispersions for metal forming
Graphite coating dispersions
Graphite additives
Lubrication
Separation
Insulation
Heat transfer
Wear reduction
Descaling
ReleaseSurface protection
Corrosion inhibition
Graphite dispersions for metal forming
Lubricant properties in the metal forming process:
Water or oil based dispersions with fine grained
graphite improve forging operations. Higher productivity
combined with cost reductions result from tailor suited
graphite lubricants. A wide range of products is available
for both, the warm and hot forging process.
Coarser grained graphite dispersions meet the high
temperature requirements for mandrel bar lubrication
and rolling applications. Graphite based dispersions are
used as release agents in a wide variety of casting and
moulding appliances.
Graphite coating dispersions
Graphite coating dispersions are applied on different
surfaces to create a layer for reducing friction. The
graphite coating dispersions can be applied on metallic,
non metallic, plastic, rubber or natural basic materials.
Graphite coating dispersions are used to create a
conductive or protective coating. Depending on the
operation condition the dispersion contains a solvent or
polymeric based binder.
Graphite additives
Graphite is added to a solvent, oil or water to
enhance properties and performance. An oil based
graphite dispersion can be used as an additive to a
mineral or synthetic oil to achieve emergency running
properties.
A water based graphite dispersion is mixed with an
oil to create a product that withstands high
temperatures. A solvent based graphite dispersion
impregnates different materials and leads to
conductivity in the material matrix.
Our products
Brand Application Grap Aqua hot metal forming
Aquanet hot metal forming Graflak corrosion protection Aquapowder hot metal forming Grafein lubrication of railway points Descalin descaling agent Drigosin paint for corrosion protection Graphi pol surface coating, corrosion protection
If you have a very special application, we can offer
you a customer related solution. We provide for:
synergistic premixes
formulations with d50 < 2,0 µm graphite
dispersions for airspraying, printing, airless
application systems
comprehensive technical support
We can deliver graphite dispersions “ready to use” or
as a powder mixture which must be dispersed on site
using special high performance mixers.