Method for preparing lanthanum oxide through microwave calcination

A lanthanum oxide, calcining technology, applied in chemical instruments and methods, rare earth metal oxides/hydroxides, inorganic chemistry, etc., can solve the problems of limited kiln body life, long roasting time, large equipment investment, etc., and achieve easy realization. The effect of industrialized production, overcoming long production cycle and improving product quality

Inactive Publication Date: 2018-09-28
四川江铜稀土有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the patent CN205352048U, a certain technical transformation has been carried out on the kiln body, which reduces the loss of heat energy and shortens the calcination time, but there are still problems such as long calcination time, large energy consumption, uneven heating of products, limited production capacity, large investment in equipment, Many problems need to be solved, such as high maintenance cost and limited kiln life
In addition, the traditional calcination methods all use radiation heating, which is easy to form a temperature gradient and lead to over-burning or under-burning of the material, making it difficult to guarantee the purity and particle size of the product

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] This example provides a method for preparing lanthanum oxide by microwave calcination. This method avoids the disadvantages of over-burning and under-burning of materials caused by the easy formation of temperature gradients in traditional calcination methods, and has the advantages of short calcination time, low energy consumption, uniform heating, and high product quality. Stable, easy to achieve automatic control and other advantages. details as follows:

[0020] Put the lanthanum salt in a ceramic crucible, put it in a microwave experimental furnace, turn on the microwave, raise the temperature to 1250°C in stages for calcination, keep the heating rate at a constant speed, and keep it warm every time it rises to a temperature step. After the calcination, the crucible was taken out and cooled to room temperature naturally to obtain the lanthanum oxide product. After testing and analysis, the chemical composition and particle size of lanthanum oxide products have rea...

Embodiment 2

[0022] This example provides a method for preparing lanthanum oxide by microwave calcination. This method avoids the disadvantages of over-burning and under-burning of materials caused by the easy formation of temperature gradients in traditional calcination methods, and has the advantages of short calcination time, low energy consumption, uniform heating, and high product quality. Stable, easy to achieve automatic control and other advantages. details as follows:

[0023] Take 100g of lanthanum carbonate powder with a particle size of less than 100 mesh and a moisture content of 3.5wt%, and put it in a ceramic crucible, and place it in a microwave experimental furnace. Start the microwave segmental heating and calcination program, control the microwave output power to 500W, and the frequency to 2.45GHz , the heating rate is controlled at 10°C / min, the temperature is raised to 350°C in the first stage, and kept for 60 minutes; the temperature is raised to 850°C in the second s...

Embodiment 3

[0025] This example provides a method for preparing lanthanum oxide by microwave calcination. This method avoids the disadvantages of over-burning and under-burning of materials caused by the easy formation of temperature gradients in traditional calcination methods, and has the advantages of short calcination time, low energy consumption, uniform heating, and high product quality. Stable, easy to achieve automatic control and other advantages. details as follows:

[0026] Take 100g of lanthanum carbonate powder with a particle size of less than 100 mesh and a moisture content of 3.5wt% in a ceramic crucible, and place it in a microwave experimental furnace, start the microwave segmental heating and calcination program, control the microwave output power to 1500W, and the frequency to 2.45GHz , the heating rate is controlled at 15°C / min, the temperature is raised to 200°C in the first stage, and kept for 30 minutes; the temperature is raised to 700°C in the second stage, and k...

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Abstract

The invention discloses a method for preparing lanthanum oxide through microwave calcination, and relates to the technical field of rare earth metal smelting. The method for preparing the lanthanum oxide through the microwave calcination, provided by the invention, comprises the steps of heating lanthanum salt to 1050-1250 DEG C in stages under a microwave condition, calcinating and cooling to obtain the lanthanum oxide after completion of the calcination, wherein the heating rate is kept at a constant rate, and heat preservation is needed after the temperature is raised to each temperature stage. By the method, characteristics of absorbing microwave by lanthanum carbonate or lanthanum oxalate are utilized, the lanthanum oxide is prepared in a staged-heating microwave calcination way, thedefects of long production cycle, low heat efficiency, and difficult guarantee of the product purity and the product granularity due to under-burning or over-burning during production of the lanthanumoxide in the conventional calcination way are overcome, and advantages of environment friendliness, high efficiency and easiness in achievement of industrial production are achieved; meanwhile, in the staged-heating way, the decomposition rate of a raw material is controlled, so that the granularity distribution of the product is optimized, and the product quality is improved.

Description

technical field [0001] The invention relates to the technical field of rare earth metal smelting, in particular to a method for preparing lanthanum oxide by microwave calcination. Background technique [0002] As one of the important rare earth oxides, lanthanum oxide is often used as a raw material for special optical glass, piezoelectric ceramics, catalysts, cathode materials, phosphors, etc., and is widely used in various fields of the national economy. [0003] At present, the industry mainly uses lanthanum salts such as lanthanum carbonate and lanthanum oxalate as raw materials, and uses pusher kilns, roller kilns or tunnel kilns to calcinate and decompose lanthanum oxide products by burning coal, water gas or electric heating. There are many problems in the actual production of the traditional calcination method. For example, due to the limitation of the material of the kiln body, the output of the push plate kiln is not large, the kiln hole is not large, the heating m...

Claims

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Application Information

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IPC IPC(8): C01F17/00
CPCC01P2004/61C01F17/206
Inventor 阳启华吴金玲简志超颜豪威王日陈云顾晓明
Owner 四川江铜稀土有限责任公司
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