A method and device for microwave calcination of uranium chemical concentrate

A chemical concentrate and calcination technology, which is applied in the field of microwave calcined uranium chemical concentrate, can solve the problems of unrealized industrial continuous feeding and discharging, large-scale production, environmental impact of harmful flue gas emission, and low energy and heat utilization rate, so as to avoid Emission of harmful impurities and gases, improvement of energy efficiency, digitalization and high degree of automation

Active Publication Date: 2017-05-31
KUNMING UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0004] As a green and efficient heating method, microwave can selectively heat materials through energy dissipation inside the materials. It has the advantages of uniform heating, high thermal efficiency, and shortened reaction time, which cannot be compared with conventional heating. The patent (application number 200910094840.8) A method of microwave calcining ammonium diuranate to produce U3O8. Although it achieves rapid heating of materials, short heating time (calcination time) and certain energy-saving effects, the method is limited to small amounts of materials. (15g) small-scale experiment, the amount of processed materials was small, and industrial continuous feeding and discharging of materials and large-scale production were not realized; secondly, the material was not stirred during the calcination process, resulting in poor product uniformity, and the high-temperature flue gas generated during the calcination process was not treated. , there are problems such as low energy heat utilization rate and high production cost, and the emission of harmful flue gas will have a certain impact on the environment

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  • A method and device for microwave calcination of uranium chemical concentrate

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Effect test

Embodiment 1

[0028] The method for microwave calcining uranium chemical concentrate, its specific steps are as follows:

[0029] (1) First, add uranium chemical concentrate into the microwave calcination chamber at a feed rate of 300kg / h, control the stirring speed in the microwave calcination chamber to 20r / min, and then feed high-temperature waste heat flue gas to cool the uranium chemical concentrate Preheat to a temperature of 400°C; the uranium chemical concentrate is ammonium diuranate (ADU); 3 / h;

[0030] (2) Carry out three-stage calcination of the preheated uranium chemical concentrate: first, during the first stage of calcination: control the microwave output power to 20kW at a heating rate of 80°C / min, the calcination temperature to 840°C, and the calcination time to 5min ; Then in the second stage of microwave calcination process: adjust the microwave output power to 55kW, the calcination temperature to 870°C, and the calcination time to 5min; finally carry out the third stag...

Embodiment 2

[0039] The method for microwave calcining uranium chemical concentrate, its specific steps are as follows:

[0040] (1) First, add the uranium chemical concentrate into the microwave calcination chamber at a feed rate of 100kg / h, control the stirring speed in the microwave calcination chamber to 10r / min, and then feed the high-temperature waste heat flue gas to cool the uranium chemical concentrate Preheating to a temperature of 300°C; the uranium chemical concentrate is ammonium uranyl tricarbonate (AUC); the temperature of the high-temperature waste heat flue gas is 600°C, and the flow rate is 1m 3 / h;

[0041] (2) Carry out three-stage calcination of the preheated uranium chemical concentrate: first, during the first stage of calcination: control the microwave output power to 25kW at a heating rate of 60°C / min, the calcination temperature to 800°C, and the calcination time to 6min ; Then in the second stage of microwave calcination process: adjust the microwave output powe...

Embodiment 3

[0050] The method for microwave calcining uranium chemical concentrate, its specific steps are as follows:

[0051] (1) First, add the uranium chemical concentrate into the microwave calcination chamber at a feed rate of 400kg / h, control the stirring speed in the microwave calcination chamber to 30r / min, and then feed high-temperature waste heat flue gas to cool the uranium chemical concentrate Preheating to a temperature of 500°C; the uranium chemical concentrate is ammonium uranyl tricarbonate (AUC); the temperature of the high-temperature waste heat flue gas is 800°C, and the flow rate is 15m 3 / h;

[0052] (2) Carry out three-stage calcination of the preheated uranium chemical concentrate: first, during the first stage of calcination: control the microwave output power to 35kW at a heating rate of 100°C / min, the calcination temperature to 850°C, and the calcination time to 3min ; Then in the second stage of microwave calcination process: adjust the microwave output power ...

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Abstract

The invention relates to a method and device for microwave calcination of a uranium chemical concentrate, and belongs to the technical field of microwave metallurgy. The method comprises leading the uranium chemical concentrate into high-temperature waste heat flue gas for preheating the cold uranium chemical concentrate, and performing three segments of calcination. The device is composed of a microwave generator, a spiral stirring device, a microwave control device, a temperature measuring device and a flue gas circulation purifying system. According to the method, industrial continuous production is realized; the high-temperature waste heat flue gas is fully utilized; and self-circulation treatment is implemented. The uranium chemical concentrate can be directly and fast heated; the heat loss of the material is reduced; and the energy utilization rate is increased. The uniformity of the product is improved; emission of harmful impurities and gas is avoided; and clean production is realized. The device is high in equipment automation degree and strong in controllability.

Description

technical field [0001] The invention relates to a method and a device for microwave calcining uranium chemical concentrate, belonging to the technical field of microwave metallurgy. Background technique [0002] Uranium is the material basis for the development of the nuclear energy industry, and has great strategic significance for ensuring national security, energy security, and environmental security. The uranium nuclear fuel is mainly through the grinding-acid or alkali leaching-mother liquor separation-ion exchange method (also known as adsorption method) and solvent extraction method for solution purification and impurity removal-precipitation process, and then the precipitate is washed, filtered and dried. The hydrometallurgy product uranium chemical concentrate is obtained, and the uranium chemical concentrate is calcined to obtain the nuclear pure product U 3 o 8 . [0003] u 3 o 8 It is the measurement benchmark of uranium product output and has a very importa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02C22B1/02
Inventor 刘秉国马爱元彭金辉胡锦明张利波谢凌峰旷梅华夏洪应李世伟郑雪梅
Owner KUNMING UNIV OF SCI & TECH
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