Method for preparing white mixed nanometer silicon material by using red attapulgite clays

Abstract

The invention discloses a method for preparing a white nanometer silicon material by using red attapulgite clays. The method includes the steps that firstly, red attapulgite clay mineral powder is sprayed with an inorganic acid aqueous solution, and the mixture is stirred evenly, then pressed into thin slices through roller treatment and put for 12-24 h at 80-120 DEG C in a tightly covering mode;then the preactivated attapulgite clay slices are dispersed into an organic acid aqueous solution, orthosilicic acid is added and mixed well, and the mixture is subjected to a reaction for 4-24 h at 60-100 DEG C; and then reacted suspension liquid is homogenized under the high pressure, centrifugal separation is conducted, and a solid product is washed, dried and crushed to obtain the white mixednanosized silica material. According to the method, through the process of 'colorcausing metal ion dissolution-silicic acid in-situ hydrolysis coating-high-pressure homogeneous dissociation', the white mixed nanosized silica material containing a nanosized silica rod crystal with the same length as an attapulgite rod crystal and two-dimensional nanosheet-shaped silicon oxide is obtained, the product whiteness is good, and application of attapulgite is widened.

Description

technical field [0001] The invention relates to a preparation method of a white nano-silicon material, in particular to a method for preparing a white mixed-dimensional nano-silicon material by using red attapulgite clay, and belongs to the technical field of deep processing of natural non-metallic minerals and preparation of nano-materials. Background technique [0002] Attapulgite (also known as palygorskite or palygorskite) is a natural 2:1 chain-layered hydrated magnesium aluminum silicate mineral with nano-rod crystal morphology, rich channel characteristics, and the surface contains A large number of hydroxyl groups have excellent physical and chemical properties, and are widely used in many fields such as adsorption, colloid, carrier and reinforcement. Attapulgite clay resources are abundant in my country, mainly in Anhui, Jiangsu and Gansu. Among them, the attapulgite clay in Gansu Province mainly occurs in the Tertiary strata, which is distributed in a band shape a...

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Problems solved by technology

CN101434393A discloses a method for preparing nano-scale amorphous silica from attapulgite clay, specifically, the attapulgite raw material is roughly selected and crushed, ultrasonically dispersed, configured into a suspension, classified and purified, and dried and crushed; After that, it is mixed with a decomposing agent, calcined, reacted with acid, separated, and washed to obtain active silica, but this process has many processes, harsh reaction temperature, high energy consumption, and there is no impact on mineral particle aggregates and crystals in the process. Beam dissociation, the obtained products are difficult to reach the nanoscale

So far, there are no reports and application precedents about the simultaneous whitening and crystal beam dissociation of red attapulgite clay to prepare 1D / 2D hybrid nano-SiO materials

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