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A kind of preparation method of large specific surface area barium carbonate

A large specific surface area, barium carbonate technology, applied in the direction of barium carbonate, calcium carbonate/strontium/barium, etc., can solve the problem of costing money, and achieve the effect of simple preparation method, easy operation and low energy consumption

Active Publication Date: 2018-09-11
广州建丰稀土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] High-performance rare earth-barium titanate multilayer capacitors are widely used in consumer electronics, communications, computers and other electronic industries, requiring the specific surface area of ​​the raw material barium carbonate to be greater than 10m 2 / g, while the specific surface area of ​​barium carbonate in the domestic market is usually only 2-3m 2 / g, high-performance rare earth-barium titanate multilayer capacitors can only be produced by importing barium carbonate with large specific surface area, which is more expensive

Method used

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preparation example Construction

[0009] This specific embodiment adopts the following technical scheme: its specific preparation method includes the following steps: Step 1: at normal temperature, dissolving barium chloride in deionized water to make a solution with a concentration of 1.5-3%, filtering the chlorine Cool the barium solution to 1-4°C;

[0010] Step 2: Dissolve sodium carbonate in deionized water at room temperature to make a solution with a concentration of 3-6%, and cool the sodium carbonate solution to 2°C after filtering;

[0011] Step 3: Add the 2°C sodium carbonate solution prepared in step 2 into the reaction kettle, and place the reaction kettle in an ultrasonic synthesis equipment. Add the barium chloride solution into the reaction kettle at a uniform speed, and stir the solution for 25-35 minutes under the action of ultrasonic frequency 25-30KHZ, and the stirring speed is 180-220r / min;

[0012] Step 4. Pour the material that has been reacted in step 3 into the washing bucket, pour out...

Embodiment

[0013] Embodiment: at normal temperature, barium chloride is dissolved in deionized water to make a solution with a concentration of 2%, and after filtration, the barium chloride solution is cooled to 2°C; at normal temperature, sodium carbonate is dissolved in deionized water , to make a solution with a concentration of 5%, and after filtering, the sodium carbonate solution is cooled to 2°C; the prepared sodium carbonate solution at 2°C is added to the reactor, and the reactor is placed in an ultrasonic synthesis device, at 3°C, While stirring the reaction kettle, add the barium chloride solution prepared in step 1 into the reaction kettle at a constant speed, and under the action of ultrasonic frequency 27KHZ, stir the solution for 30 minutes at a stirring speed of 200r / min; Put it into the washing bucket, pour out the supernatant after natural clarification, add deionized water, wherein the volume ratio of deionized water to the precipitated material is 3:1, after washing 7 ...

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Abstract

The invention discloses a preparation method of barium carbonate with a large specific surface area, and relates to the technical field of preparation of barium carbonate. The preparation method comprises the steps of at normal temperature, dissolving barium chloride in deionized water to prepare a solution, and cooling the barium chloride solution to 1-4 DEG C after filtration; at normal temperature, dissolving sodium carbonate in deionized water to prepare a solution, and cooling the sodium carbonate solution to 1-4 DEG C after filtration; and adding the sodium carbonate solution of 2 DEG C into a reaction kettle, placing the reaction kettle into ultrasonic synthesis equipment, adding the barium chloride solution into the reaction kettle at a constant speed while performing stirring in the reaction kettle at 2-5 DEG C, pouring materials obtained after completion of the reaction into a washing barrel, pouring out the supernatant after natural clarification, adding deionized water, performing washing for seven times, then performing solid-liquid separation by using a centrifuge, putting a solid barium carbonate wet material obtained after separation into an electric heating constant-temperature air blast drying oven for drying, and performing screening through a sieve, thereby obtaining the barium carbonate with a large specific surface area. The preparation method is low in energy consumption and is easy to operate, and other pollutants are not introduced into the preparation process.

Description

Technical field: [0001] The invention relates to a method for preparing barium carbonate with a large specific surface area, and belongs to the technical field of barium carbonate preparation. Background technique: [0002] High-performance rare earth-barium titanate multilayer capacitors are widely used in consumer electronics, communications, computers and other electronic industries, requiring the specific surface area of ​​raw material barium carbonate to be greater than 10m 2 / g, while the specific surface area of ​​barium carbonate in the domestic market is usually only 2-3m 2 / g, high-performance rare earth-barium titanate multilayer capacitors can only be produced by importing barium carbonate with a large specific surface area, which is more expensive. Therefore need to study a kind of new method that can prepare barium carbonate of large specific surface area. Invention content: [0003] In view of the above problems, the technical problem to be solved in the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
CPCC01F11/188C01P2006/12
Inventor 吴华标
Owner 广州建丰稀土有限公司
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