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Chemical industry
Jarosite sludge produced during zinc production must be pumped into silo complexes for interim storage. The problem is that jarosite sludge is solid and almost impossible to pump and initially exists as filter cake.

In order to solve this problem, SEGLER produced a specially designed double-lead screw with a relatively large input cross-section. The plant liquefies the thixotropic sludge by a certain screw thread geometry so that it can be transported with a piston membrane pump. The special features of this plant are next to no dead storage, selfcleaning output shafts, compensation for the fluctuating pump transfer capacity and a low-maintenance drive concept.

SEGLER supplied approximately 1000 m of screw conveyors to China for plastic processing companies. The screw conveyors convey plastic granulate and powder mixtures fo rthe productionof profiles. The delivery involved singl-shaft screw conveyors which are located in dustproof tube and U-troughs. With conveyor length of up to 40 m, 15 extruders can be loaded simultaneously in each case.

You can see on the photo left hand screw conveyors packaged into two packages with a complete conveying length of 36 m. The photo you can see below showes screw conveyors with a complete conveying length of 80 m splitted and packaged into transportable quantities.

This screw conveyor was designed for transporting highly explosive material.

The screw with integrated switching cabinet is located on a moveable base frame. It can thus be effortlessly deployed for conveying at various locations. It is able to convey at an angle of 0-35°; this angle can easily be adjusted with a handwheel.

The screw is located in an enclosed u-shaped trough with a special foldable cover and is intended to provide gentle product conveying. Due to a comprehensive EU type approval the machine has fulfilled the Atex requirements for the intended case.

It features the Ex protection class II 1/3 D b c T 140 °C which corresponds to the Atex Zone 20 in accordance with EG RL 94/9.

These continuously running screw devices serve as feed or discharge sluices for pressurised systems such as dryers. These closed systems can be loaded with bulk solids or emptied at pressures of -0.8 to +2 bar without significant pressure losses.

This device consists of a plug screw and a counter screw. The screw sluice is constantly supplied with bulk solids which are conveyed from the plug screw into the plugging area. There they are pressed to become a pressure-proof material plug.

This plug is then held by the speed-controlled counter screw and dismantled again. There is a large cleaning aperture at the end of the plug screw with which the screws can be easily cleaned.

This robust design is a special variant for temperatures up to 140°C. This type of construction can also be supplied in Ex versions.

To compound salt with an additive in a high construction-availability and for constant operation. Output > 40 t/h, Temperature up to 100° C, 4 – 6 min residence time Homogenisation during and after reaction. Inert operation (gas tight performance) Technical solution:
  • Conti mixing machine
  • Sturdy counter rotation gear box made in special construction for meshing mixing shafts
  • Adjustable mixing tools for best possible homogeneity of product according to given flow rate
  • Reinforced flute pipes made in special construction for a reliable, long-lasting necessary stability according to the high benchmark factor

Mixing and homogenizing pigments for the chemical industry is a fastidious engineering task and process. Research in Segler’s technical department showed that a torque of 100.000 Nm and a 132 KW power input are necessary for the specified utilizable volume of 30.000 litres. A demanding engineering task was set, whereby all employees were required to work together and within a period of 6 months, solve the problem (attempts, technical design, construction, manufacturing, assembly). Due to the demanding cleaning requirements it was necessary to install 5 large maintenance doors. The doors (1 m wide and 2 m high) ensure a problem-free entry for cleaning purposes. All metal surfaces were smoothed to make them even.
The stable construction is designed for a test pressure of 200 mbar. Special mixing tools enable a sparing and homogeneous mixture within a very short time with minimal energy output. The total net weight of the SEGLER screw conveyor mixer amounts to 26 t of high-quality high-grade steel.
Total dimensions width 3.2 m, height 4 m, length 9 m.

Free fall container mixers are mainly applied where free-flowing powdery or granular form materials from pharmaceutics, chemistry or food chemistry are supposed to be mixed carefully together. Additionally they are used for loosening up materials stored for long periods in storage vessels. The available container, in which the property to be mixed is kept, serves as a mixing tool.
By the rotation of the container and the turning on it’s principal axis (2 rotary axles, tumbling movement) an intensive and very careful mixing effect is made possible. Particularly with frequent product changes, frequent cleaning cycles are omitted, because the storage vessel is also the mixing container. The GMP (Good Manufacturing Practice) thought is very well implemented. Different containers for individual customers can be fastened onto the rack. The SPS control with touch colour display and load check is integrated into the machine.

Band conveyor mixers are used as a rule as batch load mixers. The vertical erection of two mixers one above the other enables a continuous process. The advantages of the band conveyor mixer continue to be used. Modifications to the mixing technique and recipes are not necessary. The intensive and careful mixing effect is enabled in the thrust operation by the shifting of large product sections against one another. The cooling jackets enable a homogeneous and even product temperature. It is guaranteed that the mixing properties keep a continuous flow of the matter during the mixing time. During the construction and manufacturing the requirements of the printing device guidelines 97/23/EG were fulfilled and checked by a designated organisation.

The SEGLER clearing soil is used, where badly flowing bulk materials are to be extracted from bunkers or silos. Also subsequent installation into existing silos is possible. In a customer-oriented way, we adapt our construction to fit existing systems. The selection of the material and the driving power depends on the respective area of application. The clearing soil in our illustration is manufactured from the material 1.4404. The solid construction of the driving power guarantees that particularly arduous flowing, powdered products are extracted from a pressure-vessel. For this a high-quality mechanical radial rotary shaft seal with a labyrinth was used.

DISCHARGING UNIT - for the removal of plastic granules from the sump of a washing tower
This plant for the removal of plastic granules from the sump of a washing tower is one of the largest units ever built by Segler. After being washed, the beads are collected at the base of the washing tower in a double screw conveyor. They are then automatically transferred to the front section of the conveyor screw. The product is then removed from there and fed with methanol into the closed application line. The design effectively minimises recirculation of the methanol into the washing tower located above the screw conveyor. This customised unit is an example of a conveyor unit designed for the efficient removal and dosing of a product in a highly explosive atmosphere.