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Method for preparing high purity barium carbonate by using barium nitrate and ammonium bicarbonate

A high-purity barium carbonate and ammonium bicarbonate technology, applied in the direction of calcium carbonate/strontium/barium, can solve problems affecting the crystal form and purity of barium carbonate, and achieve the effects of overcoming uneven heating, uniform particle size, and good crystal form

Inactive Publication Date: 2015-07-08
MIANYANG YUANDA NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the metathesis reaction of barium chloride and ammonium bicarbonate is mainly used at present. There are a large number of impurities in the reaction, such as chloride radicals, which directly affect the crystal form and purity of barium carbonate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0014] (1) Refining of barium nitrate: at 80°C, stir and dissolve 1000g of barium nitrate in a container with deionized water to prepare a saturated barium nitrate solution, then add a nitric acid solution with a mass fraction of 67% dropwise at room temperature In the saturated barium nitrate solution, crystals are precipitated in the solution, and the crystals are washed several times with deionized water.

[0015] (2) Preparation of barium carbonate: At 80°C, take 500 g of the refined barium nitrate solid in step (1) and dissolve it in 5000 g of deionized water with stirring to prepare a refined barium nitrate solution; at the same time, dissolve 25 g of EDTA in ammonia water and add to In the refined barium nitrate solution, stir for 30 minutes; heat the ammonium bicarbonate solid at 50°C to generate NH 3 and CO 2 gas, NH 3 and CO 2 The gas was passed into the refined barium nitrate solution at a speed of 70mL / min, and the gas was stirred and reacted at a speed of 100r / ...

Embodiment 2

[0018] (1) Refining of barium nitrate: at 50°C, stir and dissolve 1000g of barium nitrate in a container with deionized water to prepare a saturated barium nitrate solution, then add a nitric acid solution with a mass fraction of 67% dropwise at room temperature In the saturated barium nitrate solution, crystals are precipitated in the solution, and the crystals are washed several times with deionized water.

[0019] (2) Preparation of barium carbonate: at 50°C, take 100 g of the refined barium nitrate solid in step (1) and dissolve it in 1000 g of deionized water with stirring to prepare a refined barium nitrate solution; at the same time, dissolve 5 g of EDTA in ammonia water and add to In the refined barium nitrate solution, stir for 20 minutes; heat the ammonium bicarbonate solid at 30°C to generate NH 3 and CO 2 gas, NH 3 and CO 2 The gas was passed into the refined barium nitrate solution at a speed of 50 mL / min, and the gas was stirred and reacted at a speed of 50 r / ...

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Abstract

The invention discloses a method for preparing high purity barium carbonate by using barium nitrate and ammonium bicarbonate. The method comprises the following steps: refining barium nitrate, adding a nitric acid solution drop by drop for refining barium nitrate by using low solubility of barium nitrate under normal temperature, then preparing a refined barium nitrate solution, adding EDTA dissolved by ammoniacal liquor drop by drop in the barium nitrate solution, introducing NH3 and CO2 prepared by performing thermal decomposition on ammonium bicarbonate in the refined barium nitrate solution, stirring and centrifuging, washing, and roasting to obtain the high purity barium carbonate. According to the invention, a gas-liquid reaction is used for increasing the reaction area, the added EDTA can effectively control the crystal form of barium carbonate as a ball shape, in addition, a rotary calciner is employed for overcoming the phenomenon that the nonuniform heating while static state roasting leads to the hard agglomeration of a material, so that the high purity barium carbonate with uniform granularity and good crystal form can be obtained.

Description

technical field [0001] The invention belongs to the technical field of chemical industry, and in particular relates to a method for preparing high-purity barium carbonate by using barium nitrate and ammonium bicarbonate. Background technique [0002] Barium carbonate is widely used in electronics, instrumentation, and metallurgical industries. Among them, spherical high-purity ultrafine barium carbonate is currently used more in the production of PTC thermistor components, which can make capacitors have higher dielectric constant and temperature characteristics, thus giving it the characteristics of miniaturization, light weight, large capacity, high frequency and so on. However, the metathesis reaction of barium chloride and ammonium bicarbonate is mainly used at present, and there are a large number of impurities in the reaction, such as chloride radicals, which directly affect the crystal form and purity of barium carbonate. Contents of the invention [0003] In order ...

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