Lenzing Technik GmbH is a
globally leading supplier of pulp technology as well as filtration and
Filtration and Separation Technology
The department of filtration and separation technology specializes in the development and production of cutting-edge filtration systems for solid-liquid filtration. Originally designed for cleaning high viscose spinning solutions at the parent company’s fiber production, the filtration experts of Lenzing Technik have been able to continuously improve and adapt the product portfolio in the last 40 years. Today Lenzing Technik focuses on automatic backwash filter systems for cleaning low and high viscose media as used in many different industries. Thanks to the company’s untiring ambition to continue developing and define the state of the art in filtration systems, the department has become a global technology leader in solid-liquid filtration.
Own engineering and design department
In-house manufacturing department with up-to-date machining centers
In-house automation department
Piping and apparatus manufacturing in all materials of construction
Piloting and customer specific analyses
Orientation trial and analyses in our own laboratory turnkey systems
The Lenzing CakeFil is a fully automatic filtration system for cake-building filtration. Being pressure-driven, it allows for filtration of finest particles, whereby the solids can either be valuable substance or waste. The waste discharge is in pumpable, wet (“slurry”) or solid form (after cake washing and drying). The specific geometry of the filter candles ensures efficient cake discharge.
Filter fineness down to 1 µm
For finest particle size distribution through pressure filtration
Low residual moistness possible
Solid content up to 10% possible
Efficient cake discharge through convex-concave shape of filter candles
High filter service lifetime
Completely closed system
Hifh filter area possible
For suspensions difficultly filterable
Filtration with integrated cake washing and/or drying
Fully automatic with efficient, patented cake discharge
Cake-building filtration Used, where particles are granular or fibrous and form a filter cake. Solid content up to 10%. Dry or wet (“slurry”) cake discharge is possible.
Precoat filtration Suitable for slimy solids with a tendency of blocking. By using filter aid, filtration can be maintained. Our filter media allows for use of very fine filter aid for clarification filtration.
High quality needle felt with graded pore structure
Material: polypropylene, polyester
Filter fineness: 1-200 µm, nominal
Retention rates up to 85%
FDA conformity, free of silicone and other types of contamination
Single and multiple layer designs with increased dirt capacity and / or extended service life available
We focus on solving tasks for the pulp and paper industries. As a company specializing in consultation, planning and mechanical construction, we provide services such as feasibility studies, project management and project services. As a pulp and paper specialist, we offer the entire range of engineering services, and take on the procurement and delivery of equipment too. We are the ideal over-all project partner.
We have developed a number of patented processes, equipment and machinery for pulp production. The combination of technology and process know-how, coupled with engineering competence and years of project experience, ensures that clients will receive tailor-made solutions for their specific needs.
Our proprietary technologies and equipment are comprised of displacement cooking in sulfate processes, bleaching technologies and recovery processes for the sulfite industry.
Range of technologies
We offer consultation, engineering and project services in all disciplines for the pulp industry and related industries.
Lenzing Technik provides process technology, equipment and services for the sulfite as well as for the sulfate (Kraft) pulp industry.
Improves yield, pulp homogeneity, strength and bleachability
Increases pulp production without additional digesters
Reduces production costs
Accepts bad chip quality
Applicable for retrofits and green-field installations
In detail Continuous batch cooking (CBC) combines the advantages of batch operation with the continuous preparation of cooking liquors. The basic concept is to prepare all the process-related liquors in the tank farm using different tank-to-tank circulation loops.
CBC is the only displacement technology allowing a consistent and even alkali profile throughout the impregnation and cooking steps. Quick heating to temperature and the unique alkali profile are the main keys for the significantly reduced cooking cycle time and for improvement in pulp quality.
VISCBC is the process for dissolving grad pulp manufacture implementing steam pre-hydrolysis followed by a neutralization step. CBC’s special liquor management shortens the cooking cycle time and boosts capacity while improving pulp quality and yield. Quality benefits extend to pulp homogeneity, strength properties and bleachability.
CBC utilizes minimum equipment, thus saving investment costs and simplifying operation and process control. Separate digester circulation systems and circulation heat exchangers are no longer required.
The specialists of Lenzing Technik have extensive know-how in design, engineering, construction and optimization of digester plants. Their experience in combination with the company's competence in project management and contracting ensures superior project realization.
Discontinuous cooking technology for production of viscose grade pulp.
Excellent pulp quality
Reduced energy consumption
Low production cost
Accepts bad chip quality
In Detail The VISBATCH® process is the latest technology for the manufacture of dissolving grade pulp according to the sulphate process.
This discontinuous process has been energy- and process-optimised. Furthermore, this process has been successfully solved the environmental problems, such as air (odour) and water pollution (prehydrolysate), commonly encountered in this field.
Raw pulp produced by the VISBATCH® process features highest quality in terms of bleachability and further processing. The process itself is characterised by the wide number of wood species which can be used.
Automated periodic measurement of extinction of sulfite cooking liquor in the digester.
Optical transmission measurement
Measuring range: 10 - 50 extinction points
Accuracy: +/- 0.5 points per calibration
Sampling frequency: maximum 3 per minute including sample preparation
In detail In sulfite pulping, the extinction of the cooking liquor is a key factor in determining the end point of the cooking process, and therefore, in observing the quality of the desired product.
TRACK 510 is impressive due to its exceptionally high rate of automation for continuous measurement of the rate of extinction of the sulfite cooking liquor. What makes this device unique is the continuous detection of the extinction rate of the sulfite cooking liquor.
With TRACK 510, product quality can be improved as a result of constantly recording actual values. It is also possible to incorporate the data in a DCS and there is no need to take samples by hand, to name just some of the most important advantages.
The main advantages of the automated system are frequent sampling, accurate measuring and possible integration into the DCS.
We have developed and continuously improved the Lenzing Mg base recovery process.
Efficient absorption system
Minimized chemical losses
Reduced sulfur emissions
Reduced operating cost
Range of services (complete solutions and components)
Multistage absorption systems
Cooking liquor preparation
Treatment of odorous gases
This system facilitates the elimination of environmental impacts and provides a significant reduction of production costs brought about by high absorption efficiency and the integration of diffuse emissions.
The Lenzing Mg base recovery system was developed and optimized for minimized chemical losses and for efficient non-process-elements management.
The complete recovery system covers the incineration of the concentrated spent sulfite liquor together with odorous gases, the separation of the fly ash by a wet separator or electrostatic precipitator, the preparation of MgO-hydrate-slurry, which is used in multistage venturi washers to reduce the SO2 emission at the stack and gain raw acid. Then the raw acid is clarified and fortified in absorption towers and/or accumulators at different pressure levels.
Lenzing Technik has developed a special computer simulation using all relevant data form the DCS system to ensure a constant quality of the raw acid, compliance of emission and minimization of make-up MgO.