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Hydrotalcite and preparation method thereof

A hydrotalcite and metal technology, applied in chemical instruments and methods, inorganic chemistry, titanium compounds, etc., can solve problems such as the lack of hydrotalcite preparation methods

Active Publication Date: 2019-03-08
SOUTH CENTRAL UNIVERSITY FOR NATIONALITIES
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  • Summary
  • Abstract
  • Description
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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 preparation method thereof
  • Hydrotalcite and preparation method thereof
  • Hydrotalcite and preparation method thereof

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preparation example Construction

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

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

[0025] The inventors found that in the prior art, liquid phase co-precipitation is usually used to form a hydrotalcite phase, wherein the metal ion Mg 2+ , Zn 2+ , Cu 2+ and Co 2+ It can co-precipitate with tetravalent metals (Ti, Sn, etc.) in liquid phase to form LDH phase, while Ca 2+ However, it is difficult to achieve. After a lot of research, the inventor found that the reason why calcium ions cannot co-precipitate with tetravalent metals to form LDH phase may be: on the one hand, Ca 2+ The pH value of precipitation is high (pH>12 starts to precipitate), while the pH value of tetravalent metal ion precipitatio...

Embodiment 1

[0044] The present embodiment provides a preparation method of Ca-Ti based hydrotalcite, which comprises the following steps:

[0045] The total mass of Ca(OH) is 2 g 2 , CaCl 2 ·2H 2 O and TiO 2 ·H 2 O was added to the ball mill, the ball-to-material ratio was 25, the ball mill rotation speed was controlled to 600rpm, and the dry ball milled material was 2h, wherein Ca(OH) 2 , CaCl 2 ·2H 2 O and TiO 2 ·H 2 The molar ratio of O is 3:1:1.5.

Embodiment 2

[0047] The present embodiment provides a preparation method of Ca-Ti based hydrotalcite, which comprises the following steps:

[0048] The total mass of Ca(OH) is 2 g 2 , CaCl 2 ·2H 2 O and TiO 2 ·H 2 O was added to the ball mill, the ball-to-material ratio was 25, the ball mill rotation speed was controlled to 600rpm, and the dry ball milled material was 2h, wherein Ca(OH) 2 , CaCl 2 ·2H 2 O and TiO 2 ·H 2 The molar ratio of O is 3:1:1.8.

[0049] Then 0.3 mL of water was added, and the ball-to-material ratio and rotational speed were controlled to remain unchanged, and wet grinding was carried out for 1 h to obtain agglomerated hydrotalcite.

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Abstract

The invention discloses hydrotalcite and a preparation method thereof. The preparation method of the hydrotalcite comprises the following steps: carrying out dry grinding on raw materials for synthesizing the hydrotalcite; forming a hydrotalcite basic structure through solid-phase chemical reaction, wherein the raw materials comprise metal hydroxide, high-valence metal oxide and metal salt. According to the preparation method, materials are in sufficient contact through a dry grinding manner, and the high-valence hydrotalcite basic structure is formed through the solid-phase chemical reaction,so that the obstacles that the pH (Potential of Hydrogen) value and ion radius difference of liquid-phase co-precipitation is great and an LDH (Layered Double Hydroxide) phase is difficult to form are overcome.

Description

technical field [0001] The invention relates to the technical field of mining, in particular to a hydrotalcite and a preparation method thereof. Background technique [0002] Hydrotalcite (LDH) is a layered structure mineral. Part or all of the trivalent metals in the LDH component can be replaced by tetravalent metals (Ti, Sn, Zr, etc.), and the divalent metal ions Mg 2+ , Zn 2+ , Cu 2+ and Co 2+ It can co-precipitate with tetravalent metals (Ti, Sn) to form LDH phase, while Ca 2+ But difficult to achieve. [0003] Ti element has various functional properties. Titanium is a silver-white transition metal 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 known as "space metals". Therefore, the synthesis and application of Ti-based LDHs have also received extensive attention. The convert...

Claims

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Application Information

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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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