Glass / Ceramic / Natural Stone

Water treatment for glass-grinding and –scratching water, brick and natural stone processing, ceramic manufacturing.

Water treatment in the glass industry

When tools have to be exchanged or in case of errors, the glass products are sunk into a cooling basin. Due to the sudden cooling, the glass gobs burst. The large glass splinters are exported by the scraper, whereas finer glass splinters remain in the water causing turbidity. Oils and fats from the tools may also enter the cooling water.

The dirt particles in the water circuit cause precipitation in cooling towers, pipelines, heat exchangers etc.. Furthermore, the dirt particles cause high wear on parts of the plant, e.g. pumps. The oils and fats lead to an unequal cooling of the system. The dirt particles eventually lead to problems with desalting, respectively, the permissible limit of wastewater dumping into the sewerage are exceeded.

Due to continuous treatment of the cooling water by a lamella separator, the particles are removed and oils and fats concentrated. The particles accumulate in the sludge funnel and can be exported, e.g. into a dewatering container. The oils are pumped off the water surface and discharged through a coalescer.

Advantages of the cooling-basin-water treatment

  • saves costs for fresh and wastewater
  • separate disposal / recycling of oil and glass sludge
  • compliance with treatment rate restrictions
  • environmental relief through minimum amount of fresh and waste water, no oil contained in wastewater
  • reuse of glass rests
  • minimum effort for cleaning and maintenance
  • increased process stability, failure-free operation
  • no excavation of water ponds necessary
  • compact design, little space required

A further application is the treatment of glass grinder water. Here, similar particles as mentioned above are found, but generally no oils and high temperatures. In addition to the lamella separator, inclined filters, continuous and vacuum belt filters can be used as well.

In addition to supplying in-house manufactured devices, the installation of complete plants and other components (e.g. pumping stations, cooling towers) is also possible. Due to our many years of experience in the fields of effluent and process water treatment, we are your competent partner.

Ceramic, concrete and brick industry, natural stone

For the production of ceramic and brick products, process waters accrue during different process stages:

  • Treatment of cooling water for sawing, milling and grinding of the hardened work pieces
  • Treatment of washing water after the cleaning of manufacturing-plants
  • Treatment of engobe-water
  • Treatment of water used for moulding (e.g. plaster moulds for tiles)

Water is used for the cooling of tools (saw, milling machine). During the processing, dirt particles enter the water. To be able to reuse the water, it has to be purified.

During the processing of fireproof stones, fireclay elements etc. the fireproofed concrete is poured into moulds. At the end of a shift, the manufacturing-plants have to be cleaned. The soiled washing water is collected in a pit and has to be purified. That means, the concrete residuals have to be exported and innocuously disposed of or processed to be reused. Otherwise, the concrete would set and block ponds and channels.

Tiles are produced by pressing clay mass into plaster moulds. The plaster moulds, however, have a limited life time and have to be replaced by new moulds. Plaster residues are washed out of the mould by high pressure blasting it. Afterwards, this washing water is soiled with large plaster lumps and finest dusts. Before the water is disposed or reused it has to be treated.

Leiblein water treatment features the following advantages:

  • reduced costs for fresh and wastewater through recirculation
  • compliance with environmental protection requirements
  • reuse of sludge possible
  • low maintenance and cleaning-effort
  • increased process stability, failure-free operation
  • low abrasion and caking in pipelines and channels
  • no excavation of water ponds necessary
  • compact design, little space required

The main assembly for the treatment of effluent is the lamella separator. As the effluent flows through the lamellas, particles settle onto the lamellas (sedimentation), slide down into the sludge funnel and can be exported. The purified water flows into the clean water tank by passing a weir.

To separate coarse particles (plaster lumps), the pre-treatment by a solids separator is recommended. Small quantities of sludge from the lamella separator can be thickened by a dewatering container or dewatering bags / Big-Bags. In the case of large quantities of sludge, the use of a chamber filter press is an ideal solution.

Oils and fats, which may be contained in the process water, accumulate in a scum layer at the water surface in the lamella separator. The oils and fats can be skimmed off and exported by a coalescer. If very hot media are to be processed, the assemblies can be made of stainless steel as well.

In addition to supplying in-house manufactured devices, the installation of complete plants and other components (e.g. sludge presses) is also possible. Due to our many years of experience in the fields of effluent and process water treatment, we are your competent partner.

Our references

In the following, we would like to give you an overview of projects we have implemented in the recycling industry. If you require any further information or explanation, please do not hesitate to contact us.

Leiblein GmbH – solutions for the glass-, ceramic- and natural stone-industry

Contact us

Please contact us for
further information.

Pilot Plants

Customer-specific pilot
plants for testing purposes.