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Preparation method of submicron-grade barium sulfate

A sub-micron, nano-barium sulfate technology, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of complex preparation process, poor dispersion, difficult particle size control of sub-micron barium sulfate products, etc., and achieve the effect of less pollution

Inactive Publication Date: 2013-05-01
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Abstract
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  • Application Information

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Problems solved by technology

[0004] In order to solve the problems in the current technology, the present invention provides a preparation method of submicron barium sulfate, which can solve the problems of difficult particle size control, poor dispersion and complicated preparation process of submicron barium sulfate products

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  • Preparation method of submicron-grade barium sulfate
  • Preparation method of submicron-grade barium sulfate
  • Preparation method of submicron-grade barium sulfate

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preparation example Construction

[0027] A kind of preparation method of submicron order barium sulfate of the present invention, it comprises following specific processing steps:

[0028] a Seed crystal preparation

[0029] Prepare barium chloride and anhydrous sodium sulfate into solutions of 0.01-2.0 mol / L respectively, add them to barium chloride solution storage tank and sodium sulfate solution storage tank respectively, and feed nitrogen gas into the two storage tanks respectively, so that The barium chloride and sodium sulfate solutions react through the microreactor at a certain flow rate, and the two salt solutions collide and mix in an instant to obtain the product nano-barium sulfate, and its particle size is about 25-40nm.

[0030] b Preparation of the primary product of submicron barium sulfate

[0031] Nano-barium sulfate is used as the seed crystal, and the amount added is 0.1%-20.0% of the final submicron barium sulfate product amount, and the nano-barium sulfate seed crystal is ultrasonically...

Embodiment 1

[0036] a, the preparation of crystal seed: barium chloride and anhydrous sodium sulfate are respectively configured into the solution of 0.5mol / L, two kinds of solutions that are configured are poured in barium chloride solution storage tank and sodium sulfate solution storage tank respectively, And feed N into the two storage tanks 2 , the two solutions are adjusted to pass through the counterflow microreactor at a flow rate of 10 L / h, and the reaction temperature is controlled to be about 25° C. to obtain 25-40 nm seed barium sulfate.

[0037] b. Preparation of submicron barium sulfate: take nanometer barium sulfate seeds and disperse them by ultrasonic. Barium chloride and sodium sulfate were respectively configured into 0.7mol / L solutions, and 200ml of water was poured into a four-neck flask, and 5% was taken according to the mass ratio (the mass ratio of the final submicron barium sulfate product, the same below ) dispersed barium sulfate seeds, start stirring, and contr...

Embodiment 2

[0040] a, the preparation of crystal seed: barium chloride and anhydrous sodium sulfate are respectively configured into the solution of 0.5mol / L, two kinds of solutions that are configured are poured in barium chloride solution storage tank and sodium sulfate solution storage tank respectively, And feed N2 into the two storage tanks, adjust the two solutions to pass through the collision flow microreactor at a flow rate of 10L / h, control the reaction temperature at about 25°C, and obtain nano-barium sulfate of 25~40nm;

[0041] b. Preparation of submicron barium sulfate: take nano-barium sulfate seeds, disperse them by ultrasonic waves, prepare barium chloride and sodium sulfate into 0.5mol / L solutions respectively, and pour 200ml of water into a four-necked flask , measure the dispersed nano-barium sulfate seed crystals, start stirring, and control the rotation speed to 90r / min; keep the temperature of the solution in the four-necked bottle constant at 40°C, and add 100mL of ...

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Abstract

The invention relates to a preparation method of submicron-grade barium sulfate, in particular to a method for preparing the submicron-grade barium sulfate by using nano barium sulfate as seed crystal. The preparation method comprises the following steps of: preparing soluble barium salt and soluble sulfate into a solution with the concentration of 0.01-2.0 mol / L; mixing two solutions and reacting to prepare the nano barium sulfate; and then, taking the nano barium sulfate as the seed crystal to prepare a submicron-grade barium sulfate product. The method disclosed by the invention has the advantages of no utilization of additives, moderate reaction conditions, uniform product appearance, controllable grain diameter and the like, has the advantages of small pollution, easiness for controlling and the like, and has a wide market prospect.

Description

technical field [0001] The invention belongs to the field of inorganic salt chemical industry, and in particular relates to a method for preparing submicron barium sulfate by using nanometer barium sulfate as a crystal seed. Background technique [0002] As an important inorganic chemical product, barium sulfate is easy to develop, low in cost, has low hardness and oil absorption value, non-toxic, light color, high brightness, acid and alkali resistance, light resistance and good dispersibility and many other superior properties. It has developed into an irreplaceable inorganic filling (functional) material. At present, submicron ultrafine barium sulfate with a particle size in the range of (0.1μm-1.0μm) has shown good application effects and high economic value in many related fields such as plastics, coatings, paints, ceramics and papermaking. . However, the traditional method for preparing barium sulfate has many disadvantages, such as difficulty in controlling the part...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
Inventor 刘润静胡永其王勇焦其帅赵华赵凤云崔琳
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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