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Hydrotalcite and its preparation method

A technology of hydrotalcite and calcium chloride, which is applied in chemical instruments and methods, manganese compounds, inorganic chemistry, etc., and can solve problems such as the lack of preparation methods for hydrotalcite

Active Publication Date: 2021-01-26
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Therefore, prior art lacks a kind of preparation method of hydrotalcite, and it is suitable for metal ion Mg 2+ , Zn 2+ 、Cu 2+ 、Co 2 etc., and at the same time suitable for Ca 2+ Form high-valent hydrotalcites such as tetravalent with Ti, Mn, etc.

Method used

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  • Hydrotalcite and its preparation method
  • Hydrotalcite and its preparation method

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preparation example Construction

[0023]Some embodiments of the present invention improve a preparation method of hydrotalcite, which includes:

[0024]The raw materials of synthetic hydrotalcite are dry-milled, and the basic structure of hydrotalcite is formed through solid-phase chemical reaction. The raw materials include metal hydroxides, high-valent metal oxides and metal salts.

[0025]The inventor found that in the prior art, liquid phase co-precipitation is usually used to form a hydrotalcite phase, where the metal ion Mg2+, Zn2+, Cu2+And Co2+It can co-precipitate with tetravalent metals (Ti, Sn, etc.) in liquid phase to form LDH phase, while Ca2+However, it is difficult to achieve. The inventors have discovered through a lot of research that the reason why calcium ions cannot co-precipitate with tetravalent metals to form LDH phase may be: on the one hand, Ca2+The precipitation pH is higher (pH>12 begins to precipitate), while the pH value of the tetravalent metal ion precipitation is low, it is difficult for the...

Embodiment 1

[0044]This embodiment provides a method for preparing Ca-Ti hydrotalcite, which includes the following steps:

[0045]The total mass of 2g Ca(OH)2, CaCl2·2H2O and TiO2·H2O was added to the ball mill, the ball-to-material ratio was 25, the ball-mill speed was controlled to 600rpm, and the dry-type ball-milling material was 2h, of which Ca(OH)2, CaCl2·2H2O and TiO2·H2The molar ratio of O is 3:1:1.5.

Embodiment 2

[0047]This embodiment provides a method for preparing Ca-Ti hydrotalcite, which includes the following steps:

[0048]The total mass of 2g Ca(OH)2, CaCl2·2H2O and TiO2·H2O was added to the ball mill, the ball-to-material ratio was 25, the ball-mill speed was controlled to 600rpm, and the dry-type ball-milling material was 2h, of which Ca(OH)2, CaCl2·2H2O and TiO2·H2The molar ratio of O is 3:1:1.8.

[0049]Then add 0.3 mL of water, control the ball-to-battery ratio and rotating speed unchanged, and perform wet grinding for 1 hour to obtain agglomerated hydrotalcite.

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Abstract

The invention discloses a hydrotalcite and a preparation method thereof. The preparation method of the hydrotalcite comprises: dry-grinding raw materials for synthesizing hydrotalcite, and forming a basic structure of hydrotalcite through a solid-phase chemical reaction, wherein the raw material includes metal hydroxides , high-valent metal oxides and metal salts. Through dry grinding, the materials are fully contacted, and a solid-phase chemical reaction occurs to form a high-valent hydrotalcite basic structure, thereby overcoming the obstacle that the liquid-phase co-precipitation is difficult to form the LDH phase due to the large difference in pH value and ionic radius.

Description

Technical field[0001]The present invention relates to the field of mining technology, in particular to a hydrotalcite and a preparation method thereof.Background technique[0002]Hydrotalcite (LDH) is a layered structured mineral. Part or all of the trivalent metals in the LDH component can be replaced by tetravalent metals (Ti, Sn, Zr, etc.). The divalent metal ion Mg2+, Zn2+, Cu2+And Co2+It can co-precipitate with tetravalent metals (Ti, Sn) in the liquid phase to form LDH phase, while Ca2+It is difficult to achieve.[0003]Ti element has many functional properties. Titanium is a silver-white transition metal, which is characterized by light weight, high strength and metallic luster. Titanium alloys have good heat resistance, low temperature toughness and fracture toughness. Titanium and titanium alloys are widely used in the aviation industry and are called "space metals". Therefore, the synthesis and application of Ti-based LDH have also received extensive attention. The transformab...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G23/00C01G45/00
CPCC01G23/00C01G45/00
Inventor 瞿军沙琳徐志高张其武何正艳吴明
Owner SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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