Preparation method of ultrafine barium carbonate

A technology of barium carbonate and ammonium carbonate slurry, which is applied in the field of powder materials, can solve the problems of high impurity content and large particle size of barium carbonate, and achieve the effect of low impurity content, fine particle size and avoiding agglomeration

Active Publication Date: 2018-06-01
蒋央芳
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the barium carbonate obtained by the conventional prepa

Method used

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  • Preparation method of ultrafine barium carbonate

Examples

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Embodiment 1

[0037] A kind of preparation method of superfine barium carbonate, it is the following steps:

[0038] (1) Add barite to ammonium carbonate slurry, then put it into a ball mill for wet grinding to obtain barite slurry, then put the slurry into a rotary kiln for calcination at a temperature of 385°C, and use an induced draft fan at the same time The air in the rotary kiln is taken away, the pressure in the rotary kiln is maintained at 0.92 atmospheres, the calcination time is 3.5 hours, then the calcined material is added to pure water and stirred for 1.8 hours, and then filtered to obtain the first filtrate and the first Filter residue, add the first filtrate to natural zeolite, mix and stir for 1.8 hours at a temperature of 55°C, then filter to obtain the second filtrate and second filter residue, pass the second filtrate into hydrogen sulfide, and react at a temperature of 43°C for 0.75 hours , then add hydrogen fluoride solution, react at a temperature of 93° C. for 2.5 hou...

Embodiment 2

[0050] A kind of preparation method of superfine barium carbonate, it is the following steps:

[0051] (1) Add barite to ammonium carbonate slurry, then put it into a ball mill for wet grinding to obtain barite slurry, then put the slurry into a rotary kiln for calcination at a temperature of 385°C, and use an induced draft fan at the same time The air in the rotary kiln is taken away, the pressure in the rotary kiln is maintained at 0.92 atmospheres, the calcination time is 3.7 hours, then the calcined material is added to pure water and stirred for 1.2 hours, and then filtered to obtain the first filtrate and the first Filter residue, add the first filtrate to natural zeolite, mix and stir for 1.8 hours at a temperature of 52°C, then filter to obtain the second filtrate and second filter residue, pass the second filtrate into hydrogen sulfide, and react at a temperature of 42°C for 0.75 hours , then add hydrogen fluoride solution, react at a temperature of 92° C. for 2.5 hou...

Embodiment 3

[0062] A kind of preparation method of superfine barium carbonate, it is the following steps:

[0063](1) Add barite to ammonium carbonate slurry, then put it into a ball mill for wet grinding to obtain barite slurry, then put the slurry into a rotary kiln for calcination at a temperature of 385°C, and use an induced draft fan at the same time The air in the rotary kiln is taken away, the pressure in the rotary kiln is maintained at 0.92 atmospheres, the calcination time is 3.7 hours, then the calcined material is added to pure water and stirred for 1.2 hours, and then filtered to obtain the first filtrate and the first Filter residue, add the first filtrate to natural zeolite, mix and stir for 1.8 hours at a temperature of 52°C, then filter to obtain the second filtrate and second filter residue, pass the second filtrate into hydrogen sulfide, and react at a temperature of 42°C for 0.75 hours , then add hydrogen fluoride solution, react at a temperature of 92° C. for 2.5 hour...

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Abstract

The invention discloses a preparation method of ultrafine barium carbonate. The preparation method comprises the following steps: adding barites into ammonium carbonate slurry, and then putting into aball mill for wet milling to obtain barite slurry, putting the slurry in a rotary kiln to be calcined, then adding the calcined material into pure water, stirring and mixing, filtering to obtain first filtrate, adding the first filtrate into natural zeolite, filtering, introducing hydrogen sulfide and hydrogen fluoride solution into the obtained second filtrate, vacuum concentrating the obtainedthird filtrate, cooling, crystallizing to obtain barium hydroxide crystals, adding the barium hydroxide particles into a container with supercritical carbon dioxide, ultrasonically treating for 30 to50 min, then beginning to release the pressure, communicating the container and a dust collection apparatus, collecting solids, thus obtaining the ultrafine barium carbonate. The preparation method is simple in process, low in cost, fine in granularity of the obtained barium carbonate particles, less in waste water yield, high in purity and low in impurity content.

Description

technical field [0001] The invention relates to a preparation method of ultrafine barium carbonate, which belongs to the field of powder materials. Background technique [0002] Barite is the most common mineral of barium, and its composition is barium sulfate. Produced in low-temperature hydrothermal veins, such as quartz-barite veins, fluorite-barite veins, etc., often coexist with galena, sphalerite, chalcopyrite, and cinnabar. Most of the barite deposits produced in Hunan, Guangxi, Qinghai, and Jiangxi in my country are huge hydrothermal single mineral veins. Barite can also be produced in sedimentary rocks, appearing in the form of nodules, and mostly exists in sedimentary manganese deposits and argillaceous and sandy sedimentary rocks in shallow seas. In the residual clay overburden of the weathered residual deposit, it is often nodular and massive. Its chemical composition is: BaO: 65.7%, SO 3 : 34.3%. There are isomorphic substitutions of Sr, Pb and Ca in the co...

Claims

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Application Information

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IPC IPC(8): C01F11/18
CPCC01F11/188C01P2004/60C01P2006/11C01P2006/80Y02P20/54
Inventor 蒋央芳
Owner 蒋央芳
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