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Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal

A technology of mineral particles and synthetic particles, applied in the direction of germanium compounds, silicon compounds, chemical instruments and methods, etc., can solve the problems of crystallinity and thermal stability of talc compositions that cannot be obtained

Active Publication Date: 2009-07-22
LUZENAC EURO +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0016] Therefore, the hydrothermal synthesis method described in the 1989 publication of Decarreau et al. does not lead to talc compositions of satisfactory quality - especially in terms of crystallinity and thermal stability

Method used

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  • Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal
  • Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal
  • Method for preparing talcose compositions comprising synthetic mineral particles containing silicon, germanium and metal

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Embodiment Construction

[0107]A - General scheme for the synthesis of the talc compositions of the present invention

[0108] 1- Preparation of gels containing silicon, germanium and metals

[0109] Gels containing silicon, germanium and metals are prepared by co-precipitation according to the following reaction:

[0110]

[0111] Hydrated gels containing silicon, germanium and metals with stoichiometric talc (4Si / Ge for 3M) can be obtained by the co-precipitation reaction. It starts with:

[0112] 1. An aqueous solution of sodium silicate pentahydrate or an aqueous solution of sodium germanate, or a mixture of these two solutions in a molar ratio of x:(1-x),

[0113] 2. Metal chloride solutions prepared by diluting one or more metal salts (in the form of hygroscopic crystals) in distilled water, and

[0114] 3.1N hydrochloric acid solution.

[0115] Gels containing silicon, germanium and metals were prepared according to the following scheme:

[0116] 1. The hydrochloric acid solution and ...

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Abstract

The invention relates to a method for preparing a composition, that is a talcose composition, comprising synthetic mineral particles which contain silicon, germanium and metal, have a crystalline and lamellar structure, and are of formula (SixGe1-x)4 M3O10(OH)2, wherein M is at least one divalent metal and is of formula Mgy(1)Coy(2)Zny(3)Cuy(4)Mny(5) Fey(6)Niy(7)Cry(8), and x is a real number of the interval [0; 1]. According to said method, a gel containing silicon, germanium and metal, of formula - (SixGe1-x)4M3O11, n'H2O -, in the liquid state, is subjected to a hydrothermal treatment over a defined period of time and at a temperature of between 300 DEG C and 600 DEG C, said time and temperature being selected according to the desired particle size and structural stability for the mineral particules containing silicon, germanium and metal, to be prepared.

Description

technical field [0001] The present invention relates to a method for the preparation of a composition which is a talc composition comprising at least one formula (Si x Ge 1-x ) 4 m 3 o 10 (OH) 2 Synthetic minerals containing silicon, germanium and metals that are particles chemically and structurally very similar to natural talc. The size of the mineral particles, depending on the specific parameters applied when carrying out the method, varies from a few tens of nanometers to about ten micrometers, with a particle size distribution that is essentially unimodal and monodisperse. The invention also relates to the talc composition obtained by carrying out the method, which has properties similar to or even superior to natural talc, especially mechanical and chemical properties, which can be used as a substitute for natural talc in many applications. Background technique [0002] Natural talc is a mineral with the formula Si 4 Mg 3 o 10 (OH) 2 The hydrated magnesium s...

Claims

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Application Information

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IPC IPC(8): C01B33/38C01B33/20C01B33/22
CPCC01P2002/82C01B33/28C01P2002/72C09C1/28C01B33/20C01B33/22C01P2004/03C01P2004/04C01B33/38C01G17/00
Inventor F·马丁J·费雷C·莱布尔S·珀蒂O·格罗比J-P·博尼诺D·阿瑟盖A·德卡雷奥E·费拉热
Owner LUZENAC EURO
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