Renewable energy and high-tech Bio-silicates from rice hulls

High-Tech Bio-Silicates made of rice hulls

The Pörner Group developed a robust technology for the production of high quality silicon products from the ash of rice hulls. The Pörner Bio-Silicate technology enables the efficient and eco-friendly production of high-tech Bio-Silicates. The new, patented process is ready for worldwide use and opens up diverse and sustainable applications.




    Customers are now able to produce Silicates not only sustainably but also economically.

                                                                                                                                 Andreas Pörner, CEO Pörner Group

    Advantages of the Bio-Silicate technology

    The Pörner Bio-Silicate technology can be used at any time along the value chain from the rice plant to the high-tech Bio-Silicate. It offers significant advantages and high flexibility. Depending on requirements, the biomass power plant or the silicate plant alone or both can be realized or expanded jointly by Pörner as an overall concept.

    the pörner technology value creation process

    The Bio-Silicate technology offers several finacial benefits, ...

    • for rice farmers - an organic fertilizer and/or crop protection agent from rice hulls (previously worthless waste product) for their fields
    • for rice mills - the profitability of the plant increases with a biomass power plant, thus covering the energy requirement locally - the rice hull ash will be processed to high-tech Bio-Silicates
    • for silicate manufacturer - economically produced high-quality, high-purity silicates from a renewable sustainable raw material

      The Pörner Bio-Silicate technology, ...

      • stabilizes the energy supply in rural areas and provides access to clean energy and high-tech products
      • solves a serious ecological problem - currently the rice hulls rot in wild landfills or are burned in open fires polluting the environment (damage to air, soil and groundwater)
      • offers a better environmental balance - CO2 emissions alone are reduced by up to 70 % (compared to conventional production, in combination with a biomass power plant)
      • improves the quality and purity of high-tech silicates - traceable metals are reduced to one tenth (compared to conventional production)

      Economic comparison


      The process

      Pörner Bio-Silicate technology

      Rice is the main food source for half of the world's population. Each grain of rice is wrapped in a pellicle, the rice hull, a perfect protection against external influences. Its high resistance is explained by its material, mainly silicates and cutins. The weight of the rice hulls is equal 20 % of the total rice grain. Accordingly, in rice processing, large quantities of rice hulls are a waste product. Due to their chemical composition, they rot slowly, but they contain enormous energy potentials, which until now have largely remained unused.

      The Pörner technology converts rice hulls in modern biomass power plants into climate-friendly, renewable "green energy". During the combustion of the hulls, rice hull ash is produced in a CO2-neutral cycle in addition to electrical and thermal energy. This rice hull ash contains more than 90 % silicon dioxide (SiO2), which is modified into cost-effective and high-quality silicate in the Pörner silicate plant.

      In the subsequent filtration step, a filter cake is obtained, which consists of almost pure carbon, another recycleable by-product. The filtrate already has a high product purity and can be used as a water glass in industrial quality after subsequent decolorization. In this way, silicates can be produced for the high purity silicate market with relatively little effort.

      Pilot plant in Freiberg

      Pörner has a modern pilot plant in Freiberg/Germany. This pilot plant is specifically designed to represent and optimize the key parameters of the process.

      Depending on customer requirements, specifications for high-quality silicate products in liquid form are created. Using state-of-the-art laboratory and prototype equipment, analytical examinations can also be carried out on site at short notice.


      Innovation Award 2018 for Pörner rice hull technology

      For the fourth time, Vogel Fachverlag honored the most innovative technologies, processes and apparatus in eleven categories at ACHEMA. Pörner received the coveted award in the category "Biotech for Chemistry" for the process "High-Tech-Silicate made of rice hulls". 

      With a sophisticated process, rice hulls, a waste material in every rice mill, can be converted into the purest silicate. Silicates are an indispensable element for the chemical industry. Silicates are currently obtained mainly with high energy expenditure from quartz sand. Rice hulls silicates have five advantages: eco-friendly production, the purest quality without heavy metal contamination, a wide range of possible uses, low production costs and low energy consumption.