Method for preparing hydrotalcite by adopting brucite

A technology of brucite and hydrotalcite, which is applied in the direction of alumina/hydroxide, etc., can solve the problems of long time consumption, increase the complexity of the process, and cumbersome process, so as to reduce production costs, improve utilization value, and source raw materials wide range of effects
CN102219248BInactive Publication Date: 2013-01-23NORTHEASTERN UNIV LIAONING +1
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
NORTHEASTERN UNIV LIAONING
Publication Date
2013-01-23
Estimated Expiration
Not applicable · inactive patent

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Abstract

The invention relates to the technical field of hydrotalcite preparation, in particular to a method for preparing hydrotalcite by using brucite. The present invention uses brucite as the magnesium source and aluminum hydroxide as the aluminum source, including two main process steps of amorphization of brucite and aluminum hydroxide and recrystallization of the amorphous material. First, brucite and hydroxide are oxidized The aluminum is mixed with a magnesium-aluminum molar ratio of 2 to 4, and then the mixed material and zirconia balls are mixed evenly at a ball-to-material ratio of 50:1, and they are put into a zirconia ball mill jar for ball milling, and then the mass fraction of water magnesium is added. Continue ball milling with deionized water with 10% to 20% of the total amount of stone and aluminum hydroxide; then mix the ball milled material with sodium carbonate solution at a molar ratio of Mg2+:CO32-=1.5 to 6, and stir in a water bath at 60 to 80°C Crystallize for 1-5 hours, the stirring speed is 500r / min, and finally wash and dry to obtain the final product hydrotalcite.
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Description

technical field

[0001] The invention relates to the technical field of hydrotalcite preparation, in particular to a method for preparing hydrotalcite by using brucite. Background technique

[0002] Hydrotalcite is a layered double hydroxyl compound metal oxide (Layered double hydroxides, referred to as LDHs), which is a type of anionic clay that has developed rapidly in recent years. Its ideal molecular formula is Mg 6 al 2 (OH) 16 CO 3 4H 2 O. The structure of hydrotalcite is similar to brucite Mg(OH) 2 , by MgO 6 Octahedrons share edges to form a unit layer, and the Mg on the layer 2+ Can be replaced by Al with similar radius within a certain range 3+ Isomorphic substitution, resulting in Mg 2+ 、Al 3+ , OH - The layers are positively charged, and the interlayer anion CO 3 2- The positive charge balance with the laminate makes the whole structure electrically neutral. In addition, there are some water molecules between the layers, which can be removed without d...

Claims

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