Process for preparation of aqueous suspensions of mineral loads, aqueous suspensions of mineral loads obtained and their uses

Abstract

The invention concerns a process for the preparation of aqueous suspensions of fluid mineral matter, which are able to be pumped and conveyed by the end user 5 immediately after the filtration stage, possibly followed by a compression, which process comprises filtration in two separate stages. The invention also concerns aqueous suspensions of mineral matter obtained and their uses.

1 - 5 . (canceled) 
   
   
       6 . An aqueous suspension of fluid mineral matter, which are able to be pumped and conveyed by the end user immediately after the filtration stage, possibly followed by a compression, characterised in that it contains 0.01% to 10%, preferentially 0.1% to 2% by dry weight of dispersant relative to the dry weight of mineral matter to be filtered, and in that it is obtained by the process as claimed in any of claims  1  to  5 . 
   
   
       7 . An aqueous suspension of mineral matter as claimed in  claim 6 , characterised in that the mineral matter is chosen from among natural calcium carbonate such as the various chalks, calcites, marbles, or again chosen from the synthetic calcium carbonates such as the calcium carbonates precipitated at different stages of crystallisation, or from the mixed carbonates of magnesium and calcium such as the dolomites, or from magnesium carbonate, zinc carbonate, lime, magnesia, barium sulphate such as barita, calcium sulphate, silica, the magnesio-silicates such as talc, wollastonite, clays and other alumino-silicates such as the kaolins, mica, metal or alkaline-earth oxides or hydroxides such as magnesium hydroxide, iron oxides, zinc oxide, titanium oxide, titanium dioxides in the anatase or rutile forms, and mixtures of them, and moreover mixtures of talc and calcium carbonate. 
   
   
       8 . The aqueous suspension as claimed in  claim 6  for use in the fields of paper, paint, water treatment, such as in the fields of purification muds, detergency, ceramics, cements or hydraulic binders, public works, inks and varnishes, gluing of textiles, and more particularly in the field of paper, ceramics, paint and water treatment.