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Bulky-grain rare earth carbonate and preparation method and application of carbonate

A rare earth carbonate, large particle technology, applied in rare earth metal compounds, chemical instruments and methods, inorganic chemistry, etc., can solve the problem that rare earth carbonate is not easy to obtain, the crystal form of carbonate precipitation is not good, and the environmental protection standard is difficult to handle. and other problems, to achieve the effect of shortened preparation cycle, low cost and less inclusion

Inactive Publication Date: 2013-04-03
QIANDONG RARE EARTH GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ammonium bicarbonate and ammonium salts will produce a large amount of ammonia nitrogen wastewater, which brings great difficulties to the environmental protection standard treatment and increases the production cost; and the method of adding seed crystals, first of all, to obtain seeds with better crystal forms, but rare earth carbonate Seed crystals are not easy to make, and the precipitation process is not easy to control
The crystal form of carbonate precipitation is not good, and it is easy to entrain impurities, resulting in high impurity content in the product, especially the high content of non-rare earth impurities such as calcium and chloride ions

Method used

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  • Bulky-grain rare earth carbonate and preparation method and application of carbonate

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Experimental program
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Effect test

Embodiment 1

[0035] see figure 2 , image 3 . At room temperature, take 1.0 L of 0.5 mol / L yttrium chloride solution, add 10 ml of 1% PAA solution, adjust the stirring speed to 100 rpm, and add 0.5 mol / L sodium carbonate solution to the feed solution until the pH value End when reaching 6.0, obtain rare earth carbonate precipitate, stop stirring, age for 12h, the precipitate is filtered, washed, dehydrated and dried to obtain yttrium carbonate, the detection particle size D50 is 201.9 μm, and the electron microscope observation is that the whole particle morphology is spherical (such as figure 2 As shown), the size is uniform; the yttrium carbonate is calcined in a muffle furnace at 900 ° C for 3 hours, and the obtained yttrium oxide is still spherical in shape (such as image 3 shown), the size is uniform, and the detection particle size D50 is 102.8 μm.

Embodiment 2

[0037] Take 1.0L of praseodymium-neodymium nitrate solution with a concentration of 1.0mol / L, heat it to 40°C, add 5ml of 1% PAA solution, adjust the stirring speed at 150 rpm, and add a sodium bicarbonate solution with a concentration of 1.0mol / L to the feed liquid until When the pH value reaches 5.5, the rare earth carbonate precipitate is obtained, the stirring is stopped, and it is aged for 6 hours. The precipitate is filtered, washed, dehydrated and dried to obtain praseodymium neodymium carbonate, and the detected particle size D50 is 92.8 μm. Spherical and uniform in size; calcining the NdPr2CO3 in a muffle furnace at 1000°C for 5 hours to obtain NdPr2O3 particles are all spherical in shape and uniform in size by electron microscope observation, and the detected particle size D50 is 55.6 μm.

Embodiment 3

[0039] Take 1.0L of lanthanum chloride solution with a concentration of 2.0mol / L, heat it to 50°C, add 1ml of 1% PVA solution, adjust the stirring speed to 250 rpm, and add a sodium carbonate solution with a concentration of 2.0mol / L to the feed solution, When the pH value reaches 6.5, the rare earth carbonate precipitate is obtained, the stirring is stopped, and the precipitation is aged for 6 hours. The precipitate is filtered, washed, dehydrated and dried to obtain lanthanum carbonate, and the detected particle size D50 is 60.2 μm. Spherical and uniform in size; the lanthanum oxide obtained by calcining the lanthanum carbonate in a muffle furnace at 1000°C for 2 hours was spherical in shape and uniform in size as observed by the electron microscope, and the detected particle size D50 was 30.5 μm.

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Abstract

The invention relates to bulky-grain rare earth carbonate and a preparation method and application of carbonate, and belongs to the technical field of powdered material preparation. The method comprises the steps of taking sodium carbonate as a precipitant, adding sodium carbonate to rare earth material liquid containing a high-polymer dispersing agent, ageing, washing, filtering, drying, and obtaining rare earth carbonate with a central gain size D50 of 50-202 micrometers, wherein grains are spherical and distributed uniformly. According to the bulky-grain rare earth carbonate and the preparation method and the application of carbonate, the technology is simple and easy to control, the dispersity and filtering performance of sediment in a technology process are good, the technological production is facilitated, the cost is low, no pollution is caused, rare earth carbonate can be further prepared to bulky-grain rare earth oxide with a central grain size D50 of 30-103 micrometers, and the grains are spherical and distributed uniformly.

Description

technical field [0001] The invention relates to a large particle rare earth carbonate and its preparation method and application, and belongs to the technical field of rare earth powder materials with special physical properties and its preparation. Background technique [0002] Rare earth elements have special chemical properties and play a very important role as additives in industrial applications, known as "industrial monosodium glutamate". With the continuous development of science and technology, some current high-tech fields also put forward some special property requirements for rare earth materials. In addition to high purity, it is also reflected in some physical properties, such as particle size, particle shape, dispersion, flow sex etc. For example, ceramic materials, fluorescent materials, polishing materials, electronic materials, optical glass, magnetic materials, catalysts and other fields have different physical property requirements for rare earth material...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F17/00
Inventor 龚斌蔡志双钟亮郑艳玲钟晓林
Owner QIANDONG RARE EARTH GRP
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