Flocculating agent based on an alkali aqueous salt clay extract containing dissolved silicate and aluminate

摘要

Disclosed is a method for manufacture of an alkaline aqueous flocculation agent (A) and a solid flocculation and sedimentation agent (B) comprising the following steps: a salt clay is initially broken down in an acid medium at increased temperature, resulting in an acid suspension of a pH-value of less than 1, the resulting acid suspension is adjusted to highly alkaline, the alkaline suspension is kept for a minimum of 2 days at increased temperature and the alkaline aqueous flocculation agent (A) is separated as a clear solution from the solid flocculation and sedimentation agent (B). The alkaline aqueous flocculating agent (A) is based on an alkali aqueous salt clay extract containing dissolved silicate and aluminate, in addition to alkali chloride, whereby for 1 part by weight of aluminate expressed as AI(OH)3 (1) 2 to 3 parts by weight of silicate expressed as SiO2 are provided and (2) at least 10 parts by weight of alkali chloride are provided. The solid flocculation and sedimentation agent (B) is in the form of an acidic and alkali extracted salt clay having an average particle size smaller than 50 micron. The disclosure further relates to a method for the production of said flocculating and sedimentation agents which can be used advantageously in swimming baths, for the treatment of drinking water, industrial water, grey water and waste water in sewage treatment plants as auxiliary agents for absorption, sedimentation and filtration. Said agents can also be used to reduce the amount of harmful substances and to embellish water in swimming pools, ponds and biotopes. The respective flocculating agent is more particularly used by means of dosing systems. One particular advantage of the invention is that the agent is obtained from a natural product and can be used in swimming pools and water biotopes without any harmful side effects.