refractory material ball press machine in south africa

high alumina refractory materials for sale - rs company

high alumina refractory materials for sale - rs company

Cheap High Alumina Refractory Materials for sale in RS Group that is a professional kiln refractory manufacturer and supplier in China. We are qualified to do scientific research and experiment to develop productions. With four factories and one trading company, we are able to provide different kinds of high alumina refractory materials and serve for our clients.

We have long-term business relationship with partners from Korea, Japan, Vietnam, Pakistan, India, Indonesia, Malaysia, Nepal, Singpore, Taiwan, Greece, Spain, South Africa, Ethiopia, Jordan, Russia, Syria Ukraine and Laos and etc. Our productions are trusted due to our strict standard of production and good after-sale service.

High alumina products can be classified into shaped and unshaped products. Shaped products refers to those with certain shape, viz, alumina ball, alumina bricks. And unshaped products, also called monolithic products, are cement, concrete, and mortar. Rongsheng Refractory Co., Ltd provide a whole range of alumina refractory products, including:

High alumina bricks, contains more than 48% alumina oxides. Due to its high refractoriness, these products are usually used in the key parts of stoves and kilns, which have extremely high working environment. High alumina refractory bricks in Rongsheng refractory includes: Fire Clay Bricks, Light Weight Alumina Bricks, Insulating Bricks, Corundum Bricks, Mullite Bricks, Andalusite Bricks, Phosphate Bonded Alumina Bricks, Anti-Stripping Bricks.

High Alumina Castables Are Always Used To Build Monolithic Projects. The Advantages Of High alumina castables is that they are easy to transport, and simple to use. High alumina cement could be used as aggregate in building furnace walls. High alumina concrete refers to a hydraulic binder. The mineral composition of High alumina concrete include aluminate cathode, calcium aluminate, etc. High alumina mortar is an aluminate cement clinker. High alumina mortar are usually used as ingredient of refractory castables, and monolithic refractory materials.

High alumina ball can be applied in metallurgy, petrochemical, building, power, non-ferrous, ceramic industries for high temperature uses. Tabular alumina balls contains mainly corundum, which has a high bulk density, low porosity and high refractoriness.

Founded in the early 1990s, through 20 years innovation and development, the company have grown into a refractory conglomerate. Our business products cover metallurgy, power, building, petrochemical, glass, and non-ferrous industries. We have 180 stuffs, including over 20 specialists. There are three manufacture lines to produce shaped, unshaped and insulation refractory materials.

Our high alumina refractory materials for sale production facility includes 8 press machine of 400 tons, 6 press machine of 315 tons, 5 edge mills, 3 grinding machine, 3 double-roll crusher, and 128m tunnel kiln production line with automatic temperature control system of double section gas producer. We have a complete set of physical and chemical testing equipment and inspection system of refractory materials.

High alumina refractory products are made from bauxiteAl2O33H2Oor industrial alumina oxides, alumina in high alumina refractory products, refer to alumina oxides. Alumina oxides have extremely high melting point of 2054, boiling point 2980. It is a high hardness compound, which have excellent high temperature performance. Refractory Bricks and other refractory products made from alumina oxides can bear high temperature, resist slag erosion, has a good thermal shock resistant, abrasion assistant, good refractory under load performance, fine compressive strength, low linear change on reheating, dense crystal structure, low apparent porosity, etc.

Due to its excellent performance under high temperature, high alumina refractory materials for sale are commonly used in places that needs to be heated to an extremely high temperature. Industries like iron, steel, cement, electricity, ceramic, etc. always need high alumina refractory materials like high alumina bricks, high alumina refractory cements to build their kilns furnaces and stoves. And high alumina products are commonly used in blast furnace, rotary kiln, etc.

Rongsheng, a professional High Alumina Refractory materials manufacturer in China, exports all kinds of cheap high alumina refractory productstoKorea, Japan, Vietnam, Pakistan, India, Indonesia, Malaysia, Nepal, Singpore, Taiwan, Greece, Spain, South Africa, Ethiopia, Jordan, Russia, Syria Ukraine and Laos and etc.

home - rhi magnesita

home - rhi magnesita

RHI Magnesita, the leading global supplier of high-grade refractory products, systems and solutions, is pleased to announce it has executed a Memorandum of Understanding (MOU) with Australian technology company Calix []

RHI Magnesita,the leading global supplier of high-grade refractory products, systems and solutions, has been awarded AA for its sustainability achievements and initiatives in MSCIs ESG ratings. MSCI ESG Research is []

RHI Magnesita, the leading global supplier of refractory products, systems and solutions, today announces that the Honble National Company Law Tribunal, Mumbai Bench (NCLT) has approved the scheme of amalgamation []

Company uses artificial intelligence to revolutionize the refractories industry and convinces the jury RHI Magnesita, the world market and technology leader for refractories products, systems and solutions, is one of []

how to make clay bricks - all you need to know | african pegmatite

how to make clay bricks - all you need to know | african pegmatite

Clay bricks are the backbone of modern construction, providing homes and workplaces for millions. African Pegmatite is a leading supplier of additives and pigments for enhanced brick properties in terms of ease of manufacture, colour and mechanical strength.

Bricks are the ubiquitous and versatile building material that provides the structure to many buildings, walls and decorative installations. As classic as they are common, the standard red brick varies in size by country and is used virtually everywhere. Of the many varieties of brick, clay bricks are by far the most common but others such as concrete bricks, mud bricks and others all form part of the building ecosystem for various applications.

The basic concept of mixing, forming, drying and baking (using a kiln) is almost identical across most types of bricks (with the notable exception being chemically set bricks). Typical modern fired clay brick composition is 50 to 60% by weight sand/silica, 20 to 30% alumina (directly from clay) and 2 to 5% lime. The balance is made up with iron oxide and magnesia. Other materials may be added such as refractory materials, glass powders, pigments and dyes for specialist applications, colouring or economic reasons to save cost.

Bricks are strong, good at heat retention and are fire and corrosion resistant. The most common shape is rectangular, however oval, cylindrical and other shapes are possible - particularly when produced using the extrusion method.

Bricks have been around for a large amount of human existence, providing vital shelter. Simple bricks would have been made from mud which was allowed to dry in the sun, before being cured in the presence of a nearby fire. Modern brick manufacture isnt all that different - especially the outdoor drying step which remains popular in many parts of the world.

The modern brick, in all its forms, is an essential part of the modern, global economy. With advances in manufacturing and progress in the field of additives and better management of starting materials, brick production is set to increase in rate as the global population grows, especially as more economies move towards higher living standards.

The first step in brick manufacture is consistent across all brick types, where all the raw materials are crushed and broken in a jaw crusher and a separator. This is done to ensure all minerals are mixed evenly and to achieve a predetermined size distribution. It is at this point that any pigments or additives are added, this is the best time as complete and thorough incorporation of the pigment or additive is ensured. Then, the mixture of ingredients desired for each particular batch is filtered and quality checked before being sent to one of the three brick shaping processes which are extrusion, moulding, or pressing.

Extrusion, out of these three is the most common and is also found to be the most economically scalable process due to the significant degree of mechanisation and automation. Now that the bricks are formed and have gone through any further quality control or surface treatment procedures, they then have to be dried so that they are free from any extra moisture. This is highly important as any excess moisture that might result in cracking during the firing process. Once this is done, they are taken to the ovens ready to be fired, after which they are cooled. Lastly, they are de-hacked, stacked and packaged.

The soft mud process is the oldest and most traditional method of brick manufacture. Firstly, relatively moist clay is taken, which has about 30% water by weight. It is then placed into a mould, either by hand or with a moulding machine and is pressed into the moulds. To keep the clay from sticking to the moulds, the moulds may be dipped in water immediately before being filled. This process produces bricks with a relatively smooth, dense surface and are known as water struck bricks. The same process can be used to create sand-moulded or sand-struck bricks by dusting the wet mould with sand right before forming the brick. These bricks have a textured and matted surface. The major disadvantage to the soft mud process is the greater amount of manual handling compared to extruded brick production.

The dry press process is the most commonly used process when making refractory bricks. Unlike the soft mud process, the clay in this has minimal water content, which is only about 10% of the total weight. The clay is placed in the moulds and a hydraulic press is used to give extremely high pressure conditions for the bricks. After they are exposed to high pressure, the bricks are then dried and fired. While they are still moist they can be engraved with functional grooves or different kinds of textures. Because of the time required, this type of production is typically reserved for high-value bricks such as the aforementioned refractory containing ones.

These bricks are known as wire cut bricks and this process is most commonly used today, owing to high production output and scalability. This process is much more modern than the others and requires less human interaction. The clay mixture is fed into a hopper, from where it is pressed through a shaping tool in a single, continuous stream, not dissimilar to sausage manufacturing. A wire then cuts the extruded clay into individual bricks which are then left to dry before being fired as usual. The bricks produced by this method have less moisture content than the other two types.

Primarily for a specific visual appearance reason, brick manufacturers may add a variety of pigments to their clay bricks, but some additional and enhanced properties may be realised through the use of these pigments.

Manganese umber refers to a broad range of manganese oxides, which are compounds with a broad applicability in pigmentation applications, in addition to having a wide variety of uses well beyond being a source of manganese metal. In addition to the rich brown colourations provided by these pigments - supplied by African Pegmatite - some added benefits such as easier handling and longer brick lifetimes are possible. When used in clay bricks, the depth of colour is viewed as excellent with a superior surface finish. A distinct benefit of the use of manganese umbers is that brick firing temperatures can be elevated - as high as 1,280 C - at which temperatures other bricks would vitrify and become unstable.

The main uses of manganese dioxide in bricks are as a pigment to change the background colour or used as an additive to manufacture speckled bricks or even both. It's important to note that even though the same basic material is used for both the processes, the determining factor between the two things is the particle size and the amount of umber used. The oxides of manganese occur together and often with iron oxide when mined, these collectively form manganese umber. The umber can be treated by a calcination process after which it is referred to as burnt umber. Burnt umber affords a much darker colouration to the final brick or ceramic tile. Manganese umber can be applied as a superficial coating pre-firing instead of being mixed into the clay. However, when used as in this manner, the water resilience properties normally associated with adding manganese to bricks are less prevalent.

Firing stability for manganese umber is good, and normal brick and ceramic firing temperatures are comfortably tolerated up to 1,280 C. If firing above 1,150 C is available, this is preferential, as it means less manganese umber needs to be used to achieve the same colour profile.

K37 is a ceramic pigment composed mainly of iron oxide, but with a substantial quantity of manganese oxide present. This has the effect of producing a deep black pigment. K37 is long lasting and non-toxic. Added in the clay mixing stage, K37 will rapidly disperse through the mixture and provide a uniformity of pigment and a consistent colouration to the final product. Higher concentrations of K37 will afford black, whilst lower concentrations will produce browns post-firing. Typical additions of K37 are between 6 and 12% by weight for a standard brick manufacture. With the desired colouration level in mind, the amount of pigment should also be calculated with the iron content of the clay in mind. Excess pigment combined with elevated iron levels can prove a hindrance to workability.

One of the advantages to using K37 over synthetic stone is that K37-pigmented ceramics will not fade over time. Instead of post-firing treatments such as glazing and painting, the complete and uniform inclusion of K37 provides a much more natural looking pigmentation, whilst being much more stable over a long timeframe. A similar visual effect and resilience to basalt can be achieved with K37 pigmentation of clay bricks, albeit with lower cost. Mechanical and strength properties of pigmented bricks using K37 is analogous to untreated bricks. Because of the complete incorporation of the pigment through the clay, the persistence of colour through the finished brick and/or tile is notable and much more effective than surface painted or glazed bricks, while also having the advantage of not being able to be chipped off or damaged on the surface, and K37 pigmented bricks are highly tolerant of adverse weather. Long term piment stability contributes to long brick and thus building lifetimes, to the benefit of both residents and contractors., in addition to an almost zero maintenance requirement.

K37 is best suited for use in clay bricks at the standard firing temperature of 1,130 C, including and especially for red clays. K37B is a developed variant of the K37 pigment that is optimal for use at lower firing temperatures around 1,080 C - particularly useful for regions with less stable or poorer quality clays.

K37 ceramic pigment is supplied as standard as a finely milled black powder, with greater than 98% of the material being ground to below 45 um (325 mesh). The specification of K37 as supplied by African Pegmatite is as follows.

Naturally white firing clay or ivory clay is used with chrome flour to form different shades of grey colour in your ceramic bricks.Often concrete or cement is used to achieve these colours however concrete is very limited in the shades of grey used and may not offer any thermal or water tolerance property enhancement. Iron chromite is used as a grey brick oxide and can create a vast range of grey colours as well as the benefits of having a fired ceramic rather than a concrete or cement brick. This is a very effective grey brick pigment which has the added benefit of being at least semi-refractory in nature owing to the presence of the chromite; a refractory material in its own right. Because of the refractoriness afforded by the chromite, chrome flour is also used in the production of chrome magnesite refractory bricks, which are used in the construction of certain furnaces and kilns.

Due to its highly corrosion and chemical resistant nature, chrome flour is used to produce magnesia chrome refractories that are especially well suited to non-ferrous metals like copper, lead, and zinc furnace linings. These bricks are suitable for the following:

Chromite-containing bricks are rarely used as primary building bricks for buildings or walls, owing to the refractory content making them more expensive, even if they are harder wearing and longer lasting. Owing to density of the chromite, bricks made using this material tend to be heavier than their standard clay counterparts.

African Pegmatite is a leading supplier of pigments and additives for the production of the highest quality clay bricks for many applications. Providing a wealth of experience and unparalleled service, African Pegmatite is the ideal partner for the building and construction sectors.

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