An elaborate product portfolio of additives, which have been specially designed for each individual process, is available for the manifold application spectrum in the refractory industry.
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Zschimmer & Schwarz
Ceramic AuxiliariesMax-Schwarz-Strasse 3–5
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Short setting times are required for the time-optimised manufacture of cement-bonded components. The use of a setting accelerator in cement-containing bodies allows the creation of a lattice of hardly soluble silicate compounds. This gives the components sufficient strength, and the result is that they can be removed from the moulds easily, before the cement bond develops its full potential.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory components. After drying, these refractory components can be heated faster than hydraulically bonded bodies.
Thixotropic vibration bodies or self-flowing castables are often used in refractory applications. These bodies must be processed with low water contents, and good flow properties are required, which can be achieved by the use of dispersants. The desired effect is an increase in density and strength, and an improved corrosion resistance.
Wetting agents permit the introduction and dispersion of hydrophobic raw materials in refractory bodies (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
The use of splinter porosity-inducing agents serves to adjust the pore size, pore volume and pore distribution in a targeted manner. A typical example of application is the manufacture of abrasive tools. Fibrous porosity-inducing agents are employed to reduce cracks and shrinkage and to permit faster de-watering.
Release agents are used during the manufacture of refractory components and bricks to achieve easy separation of the mould pieces from the moulds made of steel, resin and wood.
Short setting times are often required during the use of cement-bonded mastics. The use of a setting accelerator in cement-containing mastics allows the creation of a lattice of hardly soluble silicate compounds. This gives the components sufficient strength before the cement bond develops its full potential.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory mastics. After drying, these mastics can be heated faster than hydraulically bonded bodies.
Biocides are required for the application of organic additives and/or raw materials to counteract their deterioration caused by micro organisms such as bacteria, yeasts or fungi, and consequently to guarantee long-term stability.
Wetting agents permit the introduction and dispersion of hydrophobic raw materials in refractory bodies (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
On account of their swelling capacity, plasticisers increase the plasticity of non-plastic raw materials, which makes it possible to avoid the addition of clay as a plasticiser. Thus, the resistance to temperature variations and the hot strength of refractory pressing, ramming and extrusion bodies can be improved.
Temporary binders bring about an increase in green and dry breaking strength through the formation of adhesive forces. This leads to an increase in edge strength, which in turn is required for the easier handling of the shaped parts during the technological processes that follow and for the internal transport. The use of temporary binders allows a reduction or even the complete replacement of the clay proportion in refractory bodies. This leads to improved properties of the batch at high temperatures. The target result is the reduction in drying sensitivity.
In ceramic mastics containing water glass, the use of a hardener for water glass, which hydrolyses in the alkaline environment, allows the controlled precipitation of silicic acid, leading to a defined hardening of the body.
Short setting times are required to keep lining and repair times of aggregates as short as possible. The use of a setting accelerator in cement-containing bodies allows the creation of a lattice of hardly soluble silicate compounds. This gives the components sufficient strength, and the result is that they can be removed from the moulds easily, before the cement bond develops its full potential.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory gunning mixes. After drying, these gunning mixes can be heated faster than hydraulically bonded bodies.
Powder wetting agents permit – after their activation through water addition – the dispersion of hydrophobic raw materials in refractory gunning mixes (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
The use of splinter porosity-inducing agents serves to adjust the pore size, pore volume and pore distribution in a targeted manner. A typical example of application is the manufacture of abrasive tools. Fibrous porosity-inducing agents are employed to reduce cracks and shrinkage and to permit faster de-watering.
In order to reduce dust formation when dealing with dry delivered gunning mixes, a dust binder is already incorporated into the body during the mixing process. This application is possible in bodies with ceramic, chemical and hydraulic bonding. Contrary to the customary dust binders, a good wetting is given during processing of the gunning mix.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory ramming mixes. After drying, these ramming mixes can be heated faster than hydraulically bonded bodies.
Wetting agents permit the introduction and dispersion of hydrophobic raw materials in refractory bodies (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
On account of their swelling capacity, plasticisers increase the plasticity of non-plastic raw materials, which makes it possible to avoid the addition of clay as a plasticiser. Thus, the resistance to temperature variations and the hot strength of refractory pressing, ramming and extrusion bodies can be improved.
The use of splinter porosity-inducing agents serves to adjust the pore size, pore volume and pore distribution in a targeted manner. A typical example of application is the manufacture of abrasive tools. Fibrous porosity-inducing agents are employed to reduce cracks and shrinkage and to permit faster de-watering.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory bricks. After drying, these bricks can be heated faster than hydraulically bonded bodies.
Wetting agents permit the introduction and dispersion of hydrophobic raw materials in refractory bodies (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
The use of splinter porosity-inducing agents serves to adjust the pore size, pore volume and pore distribution in a targeted manner. A typical example of application is the manufacture of abrasive tools. Fibrous porosity-inducing agents are employed to reduce cracks and shrinkage and to permit faster de-watering.
The use of pressing agents and lubricants in refractory pressing bodies improves their lubricating effect. During pressing, internal friction of the pressed body as well as friction between the pressed body and the mould wall is reduced. Pressing agents and lubricants are also used as pressure equalising agents in pressed refractories. The result is homogeneous compaction and increase in green density.
Temporary binders bring about an increase in green and dry breaking strength through the formation of adhesive forces. This leads to an increase in edge strength, which in turn is required for the easier handling of the shaped parts during the technological processes that follow and for the internal transport. The use of temporary binders allows a reduction or even the complete replacement of the clay proportion in refractory bodies. This leads to improved properties of the batch at high temperatures. The target result is the reduction in drying sensitivity.
Release agents are used during the manufacture of refractory components and bricks to achieve easy separation of the mould pieces from the moulds made of steel, resin and wood. The friction between the piece to be pressed and the mould wall is reduced. Furthermore, the sticking tendency of pressed bodies at the mould wall is minimised.
Short setting times are required to guarantee high-volume production, and to keep repair times of aggregates as short as possible. The use of a setting accelerator in cement-containing bodies allows the creation of a lattice of hardly soluble silicate compounds. This gives the components sufficient strength, and the result is that they can be removed from the moulds easily, before the cement bond develops its full potential.
Chemical binders are applied in refractory bodies to reduce or even replace hydraulic binding agents. These alternative binders allow a compaction of refractory vibration bodies. After drying, these vibration bodies can be heated faster than hydraulically bonded bodies.
Thixotropic vibration bodies or self-flowing castables are often used in refractory applications. These bodies must be processed with low water contents, and good flow properties are required, which can be achieved by the use of dispersants. The desired effect is an increase in density and strength, and an improved corrosion resistance.
Flocculents are mainly used for the flocculation of silica sol (e.g. LITHOSOL 1530). Flocculents destabilise the silica sol and bring about gel formation.
Powder wetting agents permit – after their activation through the addition of water – the dispersion of hydrophobic raw materials in refractory vibration bodies (e.g. soot and graphite). Wetting agents are surface-active preparations exhibiting high surface affinity, which in turn decreases the surface tension of the preparation water.
The use of splinter porosity-inducing agents serves to adjust the pore size, pore volume and pore distribution in a targeted manner. A typical example of application is the manufacture of abrasive tools. Fibrous porosity-inducing agents are employed to reduce cracks and shrinkage and to permit faster de-watering.
