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A kind of preparation method of high-purity barium carbonate

A high-purity barium carbonate and ammonium bicarbonate solution technology, applied in the direction of calcium carbonate/strontium/barium, etc., can solve the problems of inability to meet the processing of high-performance PTC thermal elements, poor consistency of barium carbonate, low sulfur content of barium carbonate, etc. , to reduce the chance of agglomeration and sintering, ensure uniformity, and reduce the effect of

Inactive Publication Date: 2016-05-18
MIANYANG YUANDA NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the barium carbonate produced by the metathesis method has very low sulfur content and high purity, which is suitable for the production of PTC. However, the barium carbonate produced by the metathesis method also has defects such as poor consistency, poor crystal form, and high loss on ignition, which cannot meet the high-performance PTC thermal requirements. Processing of sensitive components

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: the barium hydroxide of 50g is added into 500g double-distilled water, stirs and dissolves in the reactor at 60 ℃, is mixed with barium hydroxide solution; 100g ammonium bicarbonate is added into 500g double-distilled water simultaneously, Stir and dissolve in a container at room temperature to prepare an ammonium bicarbonate solution; further add 3 g of fatty acid glycerides to the barium hydroxide solution, and stir at a constant temperature of 50 ° C for 60 min; then mix the ammonium bicarbonate solution with 5 g / Add it dropwise into the reaction kettle containing the barium hydroxide solution at a rate of 1 min, stir and react at 60°C at 50 rpm for 3 hours; add the completed reaction material to a centrifuge for centrifugation, and separate the obtained Rinse the solid with twice-distilled water; finally put the rinsed solid into the roasting furnace and roast at 250°C for 90min in the first section, and roast at 600°C for 60min in the second section t...

Embodiment 2

[0013] Embodiment 2: the barium hydroxide of 100g is added into 1000g double distilled water, stirred and dissolved in the reactor at 80 ℃, is mixed with barium hydroxide solution; 150g ammonium bicarbonate is added into 800g double distilled water simultaneously, Stir and dissolve in a container at room temperature to prepare an ammonium bicarbonate solution; further add 5 g of vegetable oleic acid to the barium hydroxide solution, and stir at a constant temperature of 40 ° C for 80 min; then mix the ammonium bicarbonate solution at 5 g / min The dropping speed is added dropwise in the reaction kettle that barium hydroxide solution is housed, under 40 ℃ with 40 rev / min stirring reaction 5 hours; Add the finished reaction material in the centrifuge and centrifuge, and separate the solid that obtains Rinse with double distilled water; finally put the rinsed solid into the roasting furnace and roast at 250°C for 90min in the first section, and roast at 600°C for 60min in the second...

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PUM

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Abstract

The invention discloses a preparation method of high-purity barium carbonate. The preparation method comprises following steps: a ammonium bicarbonate solution prepared from redistilled water is added into a reaction vessel filled with barium hydroxide solution and a surfactant; an obtained mixture is stirred with a certain stirring speed, and is reacted for a certain period of time; a material obtained via reaction is delivered into a centrifuge for centrifugal separation, and a solid material obtained via separation is washed with redistilled water; and the washed solid material is delivered into a roasting furnace, and is roasted for a certain period of time using temperature gradient on-line controlled dynamic calcination technology so as to obtain high-purity barium carbonate. The surfactant is added before forming of a precipitate in reaction processes, so that agglomeration of the precipitate is avoided, and digest time of the precipitate is shortened fully; the temperature gradient on-line controlled dynamic calcination technology is adopted, so that influences of roasting conditions on barium carbonate powder properties are reduced effectively, aggregation sintering of barium carbonate powder is avoided, and uniformity of product particle size, structure stability, and product quality are ensured.

Description

technical field [0001] The invention relates to the technical field of design materials, in particular to a method for preparing high-purity barium carbonate. Background technique [0002] High-purity barium carbonate powder is an essential raw material for PTC thermal components, and its quality is directly related to the quality of PTC thermal electronic components. The traditional production methods of barium carbonate include carbonization method, double decomposition method and witherite method. Among them, the barium carbonate produced by the metathesis method has very low sulfur content and high purity, which is suitable for the production of PTC. However, the barium carbonate produced by the metathesis method also has defects such as poor consistency, poor crystal form, and high loss on ignition, which cannot meet the high-performance PTC thermal requirements. Processing of sensitive components Contents of the invention [0003] In view of the above situation, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/18
Inventor 汤明松范勇军张仁达
Owner MIANYANG YUANDA NEW MATERIALS