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Method for preparing light magnesium carbonate

A light magnesium carbonate and magnesium chloride technology, applied in the direction of magnesium carbonate, etc., can solve the problems of complex operation process, low environmental benefit, high production cost, etc., and achieve the effect of simple process, simple production process and low production cost

Inactive Publication Date: 2012-04-25
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0048] This method can obtain the very high light magnesium carbonate of purity, and product crystal form is easy to control, is a kind of effective method of preparing special light magnesium carbonate, but, this method needs to control the pH value, CO in the reaction. 2 The amount of injection, and the raw material magnesium hydroxide must be prepared first, the operation process is more complicated, and the production cost is higher
[0049] The above-mentioned methods all have the disadvantages of low purity, low economy and low environmental benefit.

Method used

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  • Method for preparing light magnesium carbonate
  • Method for preparing light magnesium carbonate
  • Method for preparing light magnesium carbonate

Examples

Experimental program
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Effect test

Embodiment 1

[0083] Prepare 3L of magnesium chloride solution with a concentration of 0.2mol / L, the reaction temperature is 75°C, the liquid flow rate is adjusted to 100L / h, the gas flow rate is 550L / h, NH 3 and CO 2 The volume content is 14% and 7.8% respectively, the operating pressure is one atmosphere, the rotating speed is 600rpm, the outer diameter of the rotor is 10cm, and the inner diameter is 5cm (the supergravity level is 150g), the reaction reaches the end, cooling and filtering, washing with hot deionized water, in 110 ℃ of drying 10h, the product is the rod-shaped light magnesium carbonate (such as figure 2 ), the particle length is 25um, the width is 4um, the thickness of the nanosheet is about 20nm, and the product is 77g, and the yield is 90%.

Embodiment 2

[0085] Prepare 3L of magnesium chloride solution with a concentration of 0.3mol / L, the reaction temperature is 70°C, the liquid flow rate is adjusted to 100L / h, the gas flow rate is 550L / h, NH 3 and CO 2 The volume content is 14% and 7% respectively, the operating pressure is 1 atmosphere, the rotating speed is 800rpm, the outer diameter of the rotor is 10cm, the inner diameter is 5cm (the supergravity level is 266g), the cycle reaction reaches the end, cooling and filtering, washing with hot deionized water, Drying at 110° C. for 10 h, the product is rod-shaped light magnesium carbonate (such as image 3 ), the particle length is 15um, the width is 4um, the thickness of the nanosheet is about 20nm, and the product is 72.8g, and the yield is 85%.

Embodiment 3

[0087] Prepare 3L of magnesium chloride solution with a concentration of 0.4mol / L, the reaction temperature is 76°C, the liquid flow rate is adjusted to 100L / h, the gas flow rate is 550L / h, NH 3 and CO 2 The volume content is 12.6% and 7% respectively, the operating pressure is one atmosphere, the rotating speed is 1000rpm, the outer diameter of the rotor is 10cm, the inner diameter is 5cm (the supergravity level is 416g), the cycle reaction reaches the end point, cooling and filtering, washing with hot deionized water, Drying at 110°C for 10h, the product is a bird's nest light magnesium carbonate with a nanosheet structure (such as Figure 4 ), the average particle size of the particles is 8um, the thickness of the nanosheets is about 20nm, and 74.5g of the product is obtained, with a yield of 87%.

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Abstract

The invention relates to a method used for preparing light magnesium carbonate. The invention belongs to the field of ultra-fine particle preparation. First, a magnesium chloride solution is heated to a temperature of 50-90 DEG C, and the solution is added into a hypergravity reactor; simultaneously, a mixed gas containing NH3 and CO2 gases is delivered into the reactor; the solution contacts the mixed gas by a counter current manner in the reactor; the solution is circularly fed, and a circulated mixed absorbing reaction of MH3 and CO2 is carried out in the hypergravity reactor; after the reaction, the solution is filtered, and ammonia ions and chloride ions are removed by washing by using deionized water; the obtained material is dried by baking under a temperature of 110 DEG C, such that light magnesium carbonate is prepared. The concentration of magnesium chloride is 0.1-1mol / L, the operation pressure is normal pressure which is 1atm, and the hypergravity level is 118-600g. With the method provided by the invention, rapid, microscopic, and uniform mixing can be realized, such that a homogeneous nucleation condition required by the preparation of light magnesium carbonate can be reached. According to the invention, the process is easy to control, and aging is not required. The method provided by the invention is advantaged in simple technology and high efficiency. The method can easily be applied in large-scale productions.

Description

technical field [0001] The invention relates to a preparation method of light magnesium carbonate, in particular to the preparation of light magnesium carbonate by gas-liquid rapid mixing reaction precipitation, which belongs to the field of ultrafine particle preparation. Background technique [0002] Light magnesium carbonate is made from MgCO 3 , Mg(OH) 2 and H 2 O is composed of a certain molar ratio and is a white crystal or amorphous powder, non-toxic, odorless, and stable in the air. Its molecular formula is xMgCO 3 ·yMg(OH) 2 ·zH 2 O (wherein x=1~4, y=0~1, z=0~8). Light magnesium carbonate is slightly soluble in water, which can make the water weakly alkaline. When boiled in water for a long time, part of it will be decomposed into magnesium hydroxide. It is easily soluble in acid and ammonium salt solution, foams and decomposes when it encounters dilute acid, and releases CO 2 . When heated above 300°C, water and carbon dioxide are decomposed to produce mag...

Claims

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Application Information

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IPC IPC(8): C01F5/24
Inventor 邵磊孙宝昌周海军陈建铭陈建峰
Owner BEIJING UNIV OF CHEM TECH
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