| 摘要 |
<p>A method of processing waste paper sludge to produce moulded products. The method involves the following steps: (a) adjusting the consistency of the sludge to a suitable processing consistency, (b) adding a suitable polymeric coagulant or flocculant to the mixture, whilst subjecting the mixture to a non-shear or low shear mixing, (c) adding a suitable quantity of starch or like material to the sludge and blending the mixture and (d) applying pressure to the mixture to produce the moulded products, i.e. boards. The method also includes the step of heating the sludge mixture, either before it is pressed into a moulded product or after, to a temperature such that the starch cooks out. The boards produced by the present process are suitable for use in construction work. The fire retardant nature of the boards can be improved by the addition of proprietary fire retardants. Plastics may be added in ground or particulate forms.</p> |
