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Another feature of the invention relates to a method for the preparation of a binder composition, whereby the method comprises the steps of homogenising a dispersion of clay and a liquid in a homogenisation device in order to make a dis persion of clay flakes and to introduce a clay flake dispersion and to introduce gas microbubbles in the dispersion of clay flakes.
The gas micro bubbles are preferably added during the dispersion process. The gas is microbubbles are preferably air microbubbles. The dispersion of the clay flakes is preferably put into a substantially laminar flow, for thereafter to be put into a turbulent flow caused by a substantial change of direction. Alternatively, the clay flakes are put into a substantially laminar flow movement, thereafter they are put into a turbu lent flow movement caused by a substantial change of direc tion, whereafter the flakes again are put into a substantially laminar flow for thereafter again to be put into a turbulent flow caused by a substantial change of direction.
The change of direction is preferably in the range 45-135 degrees. The method according to the invention preferably also comprises the step of introducing at least one dispersant to the dispersion of clay flakes. The method further comprises the preferable step of adding at least one plant nutrient to the dispersion of the clay flakes. A further embodiment of the present invention relates to the use of a clay flake dispersion according to the invention as a water- and particle binding agent and a capillary transport enhancing agent for a soil mass as well as a plant protection agent. The treated layer of sand particles have the ability to filter out unwanted positively charged impurities, for example salt in seawater, cleaning contaminated water.
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