Preparation method of barium carbonate with large specific surface area
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A technology with large specific surface area and barium carbonate, applied in directions such as barium carbonate, calcium carbonate/strontium/barium, etc., can solve problems such as costing money, and achieve the effects of simple preparation method, easy operation and low energy consumption
Active Publication Date: 2016-12-07
广州建丰稀土有限公司
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[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 2-3m2 / g, only relying on imported barium carbonate with large specific surface area can produce high-performance rare earth-barium titanate multilayer capacitors, which is more expensive
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[0011] This specific embodiment adopts the following technical solutions: its specific preparation method includes the following
[0012] Steps: Step 1: Dissolve barium chloride in deionized water at room temperature to make a solution with a concentration of 1.5-3%, and cool the barium chloride solution to 1-4°C after filtering;
[0013] 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 1-4°C after filtering;
[0014] Step 3, the sodium carbonate solution of 2 ℃ prepared in the step 2 is added in the reactor,
[0015] The reaction kettle is placed in the ultrasonic synthesis equipment. At 2-5°C, while stirring the reaction kettle, add the barium chloride solution prepared in step 1 into the reaction kettle at a uniform speed. Under the action of the ultrasonic frequency of 25-30KHZ, Stir the solution for 25-35 minutes at a stirring speed of 180-220r / min;
[0016...
Embodiment
[0017] Example: at room temperature, dissolve barium chloride in deionized water to make a solution with a concentration of 2%, and cool the barium chloride solution to 2°C after filtering; at room temperature, dissolve sodium carbonate in deionized water , to make a solution with a concentration of 5%, and after filtering, cool the sodium carbonate solution to 2°C;
[0018] Add the prepared sodium carbonate solution at 2°C into the reaction kettle, and the reaction kettle is placed in the ultrasonic synthesis equipment. At 3°C, while stirring the reaction kettle, add the barium chloride solution prepared in step 1 into the reaction kettle at a uniform speed In the process, under the action of ultrasonic ultrasonic frequency 27KHZ, the solution was stirred for 30 minutes, and the stirring speed was 200r / min; The volume ratio of ionized water to precipitated material is 3:1. After washing 7 times, the solid-liquid separation is carried out with a centrifuge, and the separated s...
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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 current specific surface area of barium carbonate in the domestic market is usually only 2-3m2 / g, only relying on imported barium carbonate with large specific surface area can produce high-performance rare earth-barium titanate multilayer capacitors, 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 ...
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