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A method for directional enrichment and extraction of uranium during coal combustion

A directional enrichment and coal combustion technology, applied in the direction of improving process efficiency, can solve the problems of huge consumption of extraction reagents, difficult extraction process, and lower uranium extraction rate, and achieve efficient directional enrichment, simple operation, and reduction of uranium. the drain effect

Active Publication Date: 2019-04-12
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
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Problems solved by technology

Therefore, the output of fly ash in power plants is huge. Even if uranium is enriched in fly ash, if uranium is directly extracted from fly ash, the consumption of extraction reagents will be very large, which will bring great difficulties to the extraction process.
[0008] (3) Since the uranium oxide released from coal will be sintered at high temperature during the combustion process, the iron oxide (such as Fe 2 o 3 , Fe 3 o 4 ) or other low-melting mixture to hinder the leaching of uranium in ash, which will inevitably reduce the extraction rate of uranium

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  • A method for directional enrichment and extraction of uranium during coal combustion

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Embodiment 1

[0038] The embodiment of the present invention is a method for directional enrichment and extraction of uranium in the coal combustion process, which is carried out by the above-mentioned device. The specific steps of the method are as follows:

[0039] (1) Using step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS) to test the content of organically bound uranium in coal m 1 = 6mg / kg coal;

[0040] (2) According to the content m of the organically bound uranium in the step (1) 1 , determine the amount of CaO added as m 2 =k 1 m 1 , where k 1 =1.1, that is, 6.6mg CaO is added per kg of coal;

[0041] (3) by attaching figure 1 In the additive addition system, the additive CaO is added to the coal conveying system. The additive and coal are fully mixed in the coal mill and then enter the boiler furnace for combustion. The additive reacts with gaseous uranium in the furnace to form solid CaUO. 4 , these solid-state CaUO 4 It wil...

Embodiment 2

[0046] The embodiment of the present invention is a method for directional enrichment and extraction of uranium in the coal combustion process, which is carried out by the above-mentioned device. The specific steps of the method are as follows:

[0047] (1) Using step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS) to test the content of organically bound uranium in coal m 1 = 6.9 mg / kg coal;

[0048] (2) According to the content m of the organically bound uranium in the step (1) 1 , determine the amount of CaO added as m 2 =k 1 m 1 , where k 1 =1.3, that is, 8.97mg CaO is added per kg of coal;

[0049] (3) by attaching figure 1 In the additive addition system, the additive CaO is added to the coal conveying system. The additive and coal are fully mixed in the coal mill and then enter the boiler furnace for combustion. The additive reacts with gaseous uranium in the furnace to form solid CaUO. 4 , these solid-state CaUO 4 It...

Embodiment 3

[0054] The embodiment of the present invention is a method for directional enrichment and extraction of uranium in the coal combustion process, which is carried out by the above-mentioned device. The specific steps of the method are as follows:

[0055] (1) Using step-by-step chemical extraction method and inductively coupled plasma mass spectrometry (ICP-MS) to test the content of organically bound uranium in coal m 1 =7.7mg / kg coal;

[0056] (2) According to the content m of the organically bound uranium in the step (1) 1 , determine the amount of CaO added as m 2 =k 1 m 1 , where k 1 =1.5, that is, 11.55mg CaO is added per kg of coal;

[0057] (3) by attaching figure 1 In the additive addition system, the additive CaO is added to the coal conveying system. The additive and coal are fully mixed in the coal mill and then enter the boiler furnace for combustion. The additive reacts with gaseous uranium in the furnace to form solid CaUO. 4 , these solid-state CaUO 4 It ...

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Abstract

The invention discloses a method for directional enrichment and extraction of uranium in a coal combustion process. The method comprises the following steps: (1) the content m1 of organic combined-state uranium in coal is tested; (2) according to m1, the adding amount of an additive is determined to be m2, and m2 is equal to the product of k1 times m1; (3) the additive is added into a coal conveying system for sufficient mixing, the mixture enters a boiler hearth for combustion after the sufficient mixing, the additive reacts with gaseous uranium in the boiler hearth to produce solid-state urinate, and the solid-state urinate is fixed in bottom ash; (4) the bottom ash is crushed and screened through a ball mill; and (5) the crushed and screened bottom ash is added into H2SO4 and HF solutions, and oxidation leaching is performed by adopting a H2O2 solution as an oxidant, so that uranium in the bottom ash can be extracted. By adoption of the method disclosed by the invention, directional enrichment of gaseous uranium oxides in the bottom ash can be effectively promoted, release to the environment and adsorption in fly ash can be reduced, and the loss of uranium can be effectively reduced. Meanwhile, all that is needed for the effectively recovery of uranium is to treat the bottom ash, so that the consumption of an extraction reagent can be greatly reduced.

Description

technical field [0001] The invention belongs to the field of emission reduction control of radioactive pollutants in coal-fired flue gas, and in particular relates to a method for directional enrichment and extraction of uranium during coal combustion. Background technique [0002] China is the country with the largest coal production and consumption in the world, and my country's coal resources are mainly consumed in coal-fired power plants. In recent years, with the enhancement of people's awareness of environmental protection, the environmental pollution caused by coal utilization has been widely concerned, and the harm of radionuclide uranium in coal to the environment and human body has gradually received attention. The content of uranium in coal in my country is close to the world average, about 2.33mg / kg, but the content of uranium in coal in some mining areas is highly enriched. The content is 36.8-178 mg / kg, dozens of times higher than the national average. [0003...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B60/02
CPCC22B60/023C22B60/0234Y02P10/20
Inventor 赵永椿杨建平张翼张军营郑楚光
Owner HUAZHONG UNIV OF SCI & TECH
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