摘要:
An object (first object) of the invention is to provide a waste water treatment technology (pretreatment technology in particular) which makes it possible to recover fluorine at a high recovery rate as highly pure calcium fluoride, without diluting waste water containing fluorine and silicon, i.e. to recover fluorine from high-concentration waste water containing fluorine and silicon. Waste water containing fluorine and silicon is supplied to a pH controlling tank 1 and sodium hydroxide (NaOH) is added thereto, with the result that sodium silicate is precipitated. Thereafter, the waste water is supplied to a solid-liquid separator 2 so that solid-liquid separation of sodium silicate is conducted.
摘要:
A composition comprising at least one high Tg amorphous resin with a fibrous filler shows improved melt processability. Addition of a sulfonate salt to the compositions gives increased melt flow as well as enhanced flame retardancy in a composition which is substantially free of bromine and chlorine.
摘要:
An apparatus for making contact prints, the apparatus including a frame having a transparent plate, and a pair of frame carriers for supporting the frame at opposite sides of the printing box such that the frame is placeable over the printing plate in an optically sealed manner, each of the frame carrier including a stop means for anchoring the frame carrier at a predetermined position alongside the printing box.