CN106319250B - A kind of method of uranium orienting enriching and extraction in coal combustion process - Google Patents

A kind of method of uranium orienting enriching and extraction in coal combustion process Download PDF

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CN106319250B
CN106319250B CN201610858619.5A CN201610858619A CN106319250B CN 106319250 B CN106319250 B CN 106319250B CN 201610858619 A CN201610858619 A CN 201610858619A CN 106319250 B CN106319250 B CN 106319250B
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uranium
additive
coal
bottom ash
extraction
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CN106319250A (en
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赵永椿
杨建平
张翼
张军营
郑楚光
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Huazhong University of Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
    • C22B60/02—Obtaining thorium, uranium, or other actinides
    • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
    • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
    • C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
    • C22B60/0226—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors
    • C22B60/023—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors halogenated ion as active agent
    • C—CHEMISTRY; METALLURGY
    • C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
    • C22B—PRODUCTION AND REFINING OF METALS; PRETREATMENT OF RAW MATERIALS
    • C22B60/00—Obtaining metals of atomic number 87 or higher, i.e. radioactive metals
    • C22B60/02—Obtaining thorium, uranium, or other actinides
    • C22B60/0204—Obtaining thorium, uranium, or other actinides obtaining uranium
    • C22B60/0217—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes
    • C22B60/0221—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching
    • C22B60/0226—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors
    • C22B60/0234—Obtaining thorium, uranium, or other actinides obtaining uranium by wet processes by leaching using acidic solutions or liquors sulfurated ion as active agent
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P10/00—Technologies related to metal processing
    • Y02P10/20—Recycling

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Abstract

The invention discloses a kind of methods of uranium orienting enriching and extraction in coal combustion process comprising following steps: (1) testing the content m of organically combine state uranium in coal1；(2) according to m1The additive amount for determining additive is m2=k1·m1；(3) additive is added into coal handling system, boiler furnace is entered after being sufficiently mixed and is burnt, and additive, which reacts in burner hearth with gaseous state uranium, generates solid-state uanate, and the solid-state uanate is fixed in bottom ash；(4) bottom ash through ball milling crusher machine and is sieved；(5) bottom ash after being crushed and sieving is added to H2SO4In HF solution, H is used2O2Solution carries out Oxidation Leaching as oxidant, and the extraction of uranium in bottom ash can be realized.Method of the invention can effectively facilitate orienting enriching of the gaseous state uranium oxide in bottom ash, reduce the release to environment and the absorption in flying dust, effectively reduce the loss of uranium, simultaneously, bottom ash need to only be handled, effective recycling of uranium can be realized, greatly reduce the consumption for extracting reagent.

Description

A kind of method of uranium orienting enriching and extraction in coal combustion process
Technical field
The invention belongs to the emission reduction control fields of radioactive pollutant in coal-fired flue-gas, and in particular to a kind of coal combustion process The method of middle uranium orienting enriching and extraction.
Background technique
China is coal production amount and the maximum country of consumption figure in the world, and the coal resources in China are mainly consumed in combustion Coal-fired plant.Recently as the enhancing of people's environmental consciousness, caused problem of environmental pollution is received extensively during coal utilization General concern, radioactive nucleus uranium also gradually receives attention to the harm of environment and human body in coal.The content of uranium connects in China's coal Nearly world average, about 2.33mg/kg, but in the coal of part mining area uranium content be in highly enriched phenomenon, China Yunnan, The southwests such as Guangxi, Guizhou, Sichuan, the content of uranium is 36.8~178mg/kg in coal, is higher by the decades of times of national average value.
Uraniferous coal as fuel other than using, it may also be used for the extraction of uranium.Uranium is extracted from coal, and there are mainly two types of ways Diameter: first is that extracting uranium from raw coal；Second is that extracting uranium from coal ash.Uranium is directly extracted from raw coal, extraction reagent consumption is big, Its extraction efficiency is not high, simultaneously because organic matter can be partially soluble in extraction reagent in coal, causes solid-liquor separation difficult, increases The difficulty of extraction process.Therefore, usually by raw coal combustion, using extracting uranium from lime-ash after its thermal energy.
Patent document CN101792915A discloses a kind of method that uranium is recycled from uranium-bearing flyash, by the powder of uranium-bearing Coal ash is ground into micro mist, and aqueous precipitation separation, the sediment after separation separates after adding excess acid that reaction is sufficiently stirred, with resulting Saturated solution is electrolyte electrolysis, and electrolysis gained cathode product is separated step by step, collects uranium.Method disclosed in the patent document, The recycling for realizing waste and old resource achieves good economic benefit.But this method is only capable of returning the uranium in flyash It receives, the uranium in coal-fired flue-gas can be discharged into environment, and bring harm to human health and ecological environment.
Currently, the reason of influencing the extraction efficiency of uranium in lime-ash mainly includes the following aspects:
(1) uranium in coal is mainly with three kinds of carbonate combine state, Fe/Mn oxidizable and organically combine state shapes Formula exists.It is usually volatile with uranium existing for Fe/Mn oxidizable and carbonate combine state in coal combustion process, It is enriched in bottom ash after burning, can be used for the extraction of uranium.But with uranium existing for organically combine state, during high-temp combustion It can be volatilized with the burning of organic matter with gas phase.Wherein, a part is directly released into environment with gas phase, in addition A part can be adsorbed onto fly ash granule surface with the reduction of flue-gas temperature.Although the dust-extraction unit (ESP/FF) of power plant's assembly 99% or more fly ash particulate can be removed, still, fine particle, especially submicron order fine particle are but difficult to be filled by dedusting Capture is set, to can be discharged into environment.The gas phase uranium and uranium-bearing fine particle that can be discharged into environment are to endanger environment and human body strong The loss of uranium is also resulted in while health.
(2) in combustion, the ash content in coal usually most of (90%) forms flying dust, and a small amount of (10%) forms bottom Ash.Therefore, flying ash in electric power plant yield is huge, even if uranium is enriched in flying dust, if directly extracting uranium from flying dust, extracts disappearing for reagent Consumption also can be very huge, brings very big difficulty to extraction process.
(3) oxygen for the iron that can be sintered at high temperature due to the uranium oxide in combustion, released from coal Compound (such as Fe2O3、Fe3O4) or other eutectic mixtures package and interfere ash in uranium leaching, this will certainly reduce the extraction of uranium Rate.
Extract uranium from coal ash, how by uranium it is highly enriched in coal ash and improve uranium from the leaching rate in coal ash be to mention The key of high uranium recovery rate.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides uranium orientation in a kind of coal combustion process is rich Collection and the method extracted can effectively facilitate gaseous state uranium oxide and exist by adding suitable additive into coal or in burner hearth Orienting enriching in bottom ash reduces the release to environment and the absorption in flying dust, effectively reduces the loss of uranium, meanwhile, only Bottom ash need to be handled, effective recycling of uranium can be realized, greatly reduce the consumption for extracting reagent.
To achieve the above object, the present invention provides a kind of method of uranium orienting enriching and extraction in coal combustion process, The following steps are included:
(1) the content m of organically combine state uranium in coal is tested1；
(2) according to the content m for the organically combine state uranium tested in step (1)1, determine that the additive amount of additive is m2= k1·m1, wherein k1For excess coefficient；
(3) additive is added into coal handling system, additive and coal enter boiler furnace after being sufficiently mixed in coal pulverizer Burning, additive, which reacts in burner hearth with gaseous state uranium, generates solid-state uanate, and the solid-state uanate is fixed in bottom ash；
(4) bottom ash through ball milling crusher machine and is sieved；
(5) bottom ash after being crushed and sieving is added to H2SO4In HF solution, H is used2O2Solution is carried out as oxidant Oxidation Leaching；H is added to again to the residue after leaching2SO4In HF solution, H is used2O2Solution is as oxidant re-oxidation It leaches, the extraction of uranium in bottom ash can be realized.
Further, the excess coefficient k1=1.1~1.5.
Further, the additive is alkali or alkaline earth metal oxide.
Further, the additive is CaO.
Further, the additive and gaseous state uranium reaction temperature are 800-1200 DEG C.
Further, the test method is sequential extraction experiments method and inductive coupling plasma mass spectrometry method.
Further, the standard of the screening is 100-400 mesh.
Further, the H2SO4The concentration of solution is 50~150g/L.
Further, the concentration of the HF solution is 1~10g/L.
Further, the H2O2The concentration of solution is 10%~30%.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show Beneficial effect:
(1) in technical solution of the present invention, in the case where not influencing boiler normal combustion, by into coal or in burner hearth Suitable addition of C aO is added, when there are enough CaO in combustion process, it is easy that gaseous state uranium oxide is easy to react generation with CaO Molten compound CaUO4, orienting enriching of the gaseous state uranium oxide in bottom ash can be effectively facilitated, the release to environment is reduced and is flying Absorption in ash effectively reduces the loss of uranium, meanwhile, bottom ash need to only be handled, effective recycling of uranium can be realized, greatly Reduce the consumption for extracting reagent greatly.
(2) when there is enough CaO in combustion process, gaseous state uranium oxide, which is easy to react with CaO, generates readily soluble compound CaUO4, to inhibit oxide (such as Fe for the iron being sintered under high temperature2O3、Fe3O4) or other eutectic mixtures to uranium oxide Package, improve the leaching rate of uranium.
(3) a small amount of cheap additive, which need to be only added, in method of the invention can be realized efficiently and directionally enrichment and the uranium of uranium It leaches, additive adding manner can be also selected according to power plant's actual conditions, easy to operate, investment and operating cost are lower.
Detailed description of the invention
Fig. 1 is device involved in uranium orienting enriching in a kind of coal combustion process of the embodiment of the present invention and the method for extraction Schematic diagram.
In Fig. 1, identical appended drawing reference is used to denote the same element or structure, in which: system, 2- is added in 1- additive Coal handling system, 3- coal pulverizer, 4- boiler furnace, 5- additive injection apparatus.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that Not constituting conflict between this can be combined with each other.
Fig. 1 is device involved in uranium orienting enriching in a kind of coal combustion process of the embodiment of the present invention and the method for extraction Schematic diagram.As shown in Figure 1, device involved in uranium orienting enriching and the method for extraction includes: addition in a kind of coal combustion process System 1, coal handling system 2, coal pulverizer 3, boiler furnace 4, additive injection apparatus 5 is added in agent.
Uranium oxide can react at 800-1200 DEG C with alkali metal/alkaline earth oxide generates uanate, therefore, leads to Suitable additive, i.e. alkali metal oxide CaO are crossed into coal or add in burner hearth, the case where not influencing boiler normal combustion Under, orienting enriching of the gaseous state uranium oxide in bottom ash can be effectively facilitated, the release to environment and the absorption in flying dust are reduced. When there is enough CaO in combustion process, gaseous state uranium oxide, which is easy to react with CaO, generates readily soluble compound CaUO4, to press down Oxide (such as Fe for the iron being sintered under high temperature is made2O3、Fe3O4) or other eutectic mixtures to the package of uranium oxide, improve The leaching rate of uranium.The addition principle of additive is to guarantee that gaseous state uranium product is fully converted to solid-state uanate and is enriched in bottom In ash, while avoiding the excessive of additive that the waste of bring additive and the influence to Combustion Operation of Boilers is added again.
The addition principle of additive is to guarantee that gaseous state uranium product is fully converted to solid-state uanate, while avoiding adding again Add the excessive of agent that the waste of bring additive and the influence to Combustion Operation of Boilers is added.It therefore, need to be first using chemical step by step The content m of organically combine state uranium in extracting method and inductive coupling plasma mass spectrometry test coal1, then determine the addition of additive Amount is m2=k1·m1, wherein k1For excess coefficient (k1=1.1~1.5) system, is added by additive to add into coal handling system Doping, additive and coal enter boiler furnace after being sufficiently mixed in coal pulverizer and burn；Or it is sprayed and is filled by additive It sets and additive is ejected into burner hearth, additive, which reacts in burner hearth with gaseous state uranium, generates solid-state uanate, these solid-state uranic acid Salt will be fixed in bottom ash.
By uranium orienting enriching in bottom ash, reducing the release with gaseous state uranium and uranium-bearing fine particle to environment can be improved uranium The rate of recovery reduces the loss of uranium；Since in combustion, for flying dust, the yield of bottom ash is smaller, mentioned from bottom ash Take uranium that can save a large amount of extraction reagent；It is uranium compound easy to dissolve by uranium orienting enriching, its leaching rate can be improved.
Embodiment 1
The method of uranium orienting enriching and extraction, is carried out by above-mentioned apparatus in a kind of coal combustion process of the embodiment of the present invention, Specific step is as follows for this method:
(1) using organically combine state in sequential extraction experiments method and inductive coupling plasma mass spectrometry (ICP-MS) test coal The content m of uranium1=6mg/kg coal；
(2) according to the content m of the organically combine state uranium in step (1)1, determine that the additive amount of CaO is m2=k1·m1, In be k1=1.1, i.e., 6.6mg CaO is added in every kg coal；
(3) system is added by additive in attached drawing 1 addition of C aO is added in coal handling system, additive and coal exist Enter boiler furnace after being sufficiently mixed in coal pulverizer to burn, additive, which reacts in burner hearth with gaseous state uranium, generates solid-state CaUO4, this A little solid-state CaUO4It will be fixed in bottom ash, and realize orienting enriching of the uranium in bottom ash；
(4) bottom ash through ball milling crusher machine and is sized to 200 mesh or less；
(5) bottom ash after being crushed and sieving is added to the H of 98g/L2SO4In the HF solution of 5g/L, with 20% H2O2 Solution carries out Oxidation Leaching as oxidant, is added to the H of 98g/L again to the residue after leaching2SO4With the HF solution of 5g/L, And 20% H2O2Solution carries out re-oxidation leaching as oxidant.
Test result discovery, after adding addition of C aO into coal, 81% uranium is enriched in bottom ash in coal, the leaching of uranium Extracting rate is up to 93%；When being not added with CaO, the uranium in coal only has 56% and is enriched in flying dust, and the leaching rate of uranium is 81%.Therefore, It is added into coal after addition of C aO, it can be achieved that orienting enriching of the uranium in bottom ash, while the leaching rate of uranium greatly improves.In addition, Bottom ash need to only be handled, effective recycling of uranium can be realized, and not have to handle the huge flying dust of yield, subtracted significantly The consumption for extracting reagent is lacked.
Embodiment 2
The method of uranium orienting enriching and extraction, is carried out by above-mentioned apparatus in a kind of coal combustion process of the embodiment of the present invention, Specific step is as follows for this method:
(1) using organically combine state in sequential extraction experiments method and inductive coupling plasma mass spectrometry (ICP-MS) test coal The content m of uranium1=6.9mg/kg coal；
(2) according to the content m of the organically combine state uranium in step (1)1, determine that the additive amount of CaO is m2=k1·m1, In be k1=1.3, i.e., 8.97mg CaO is added in every kg coal；
(3) system is added by additive in attached drawing 1 addition of C aO is added in coal handling system, additive and coal exist Enter boiler furnace after being sufficiently mixed in coal pulverizer to burn, additive, which reacts in burner hearth with gaseous state uranium, generates solid-state CaUO4, this A little solid-state CaUO4It will be fixed in bottom ash, and realize orienting enriching of the uranium in bottom ash；
(4) bottom ash through ball milling crusher machine and is sized to 200 mesh or less；
(5) bottom ash after being crushed and sieving is added to the H of 50g/L2SO4In the HF solution of 2g/L, with 10% H2O2 Solution carries out Oxidation Leaching as oxidant, is added to the H of 55g/L again to the residue after leaching2SO4With the HF solution of 2g/L, And 10% H2O2Solution carries out re-oxidation leaching as oxidant.
Test result discovery, after adding addition of C aO into coal, 89% uranium is enriched in bottom ash in coal, the leaching of uranium Extracting rate is up to 95%；When being not added with CaO, the uranium in coal only has 65% and is enriched in flying dust, and the leaching rate of uranium is 80%.Therefore, It is added into coal after addition of C aO, it can be achieved that orienting enriching of the uranium in bottom ash, while the leaching rate of uranium greatly improves.In addition, Bottom ash need to only be handled, effective recycling of uranium can be realized, and not have to handle the huge flying dust of yield, subtracted significantly The consumption for extracting reagent is lacked.
Embodiment 3
The method of uranium orienting enriching and extraction, is carried out by above-mentioned apparatus in a kind of coal combustion process of the embodiment of the present invention, Specific step is as follows for this method:
(1) using organically combine state in sequential extraction experiments method and inductive coupling plasma mass spectrometry (ICP-MS) test coal The content m of uranium1=7.7mg/kg coal；
(2) according to the content m of the organically combine state uranium in step (1)1, determine that the additive amount of CaO is m2=k1·m1, In be k1=1.5, i.e., 11.55mg CaO is added in every kg coal；
(3) system is added by additive in attached drawing 1 addition of C aO is added in coal handling system, additive and coal exist Enter boiler furnace after being sufficiently mixed in coal pulverizer to burn, additive, which reacts in burner hearth with gaseous state uranium, generates solid-state CaUO4, this A little solid-state CaUO4It will be fixed in bottom ash, and realize orienting enriching of the uranium in bottom ash；
(4) bottom ash through ball milling crusher machine and is sized to 200 mesh or less；
(5) bottom ash after being crushed and sieving is added to the H of 150g/L2SO4In the HF solution of 10g/L, with 30% H2O2Solution carries out Oxidation Leaching as oxidant, is added to the H of 150g/L again to the residue after leaching2SO4With 10g/L's HF solution, and 30% H2O2Solution carries out re-oxidation leaching as oxidant.
Test result discovery, after adding addition of C aO into coal, 94% uranium is enriched in bottom ash in coal, the leaching of uranium Extracting rate is up to 95%；When being not added with CaO, the uranium in coal only has 59% and is enriched in flying dust, and the leaching rate of uranium is 79%.Therefore, It is added into coal after addition of C aO, it can be achieved that orienting enriching of the uranium in bottom ash, while the leaching rate of uranium greatly improves.In addition, Bottom ash need to only be handled, effective recycling of uranium can be realized, and not have to handle the huge flying dust of yield, subtracted significantly The consumption for extracting reagent is lacked.
In the inventive solutions, effect preferably excess coefficient k is given in implementation1Value, but the present invention is not It is limited to the excess coefficient provided in above-described embodiment, excess coefficient k1=1.1~1.5, can go in embodiment 1.1, 1.3,1.5,1.2,1.4 etc. can also be taken, the value of specific excess coefficient is determines according to actual conditions.
In the inventive solutions, it is CaO that effect preferably additive is given in implementation, but the present invention is not limited to The additive provided in above-described embodiment, additive can be alkali or alkaline earth metal oxide, the type of specific additive Determines according to actual conditions.
In the inventive solutions, effect preferably additive and gaseous state uranium reaction temperature are given in implementation, but The additive and gaseous state uranium reaction temperature provided during the present invention is not limited to the above embodiments, additive are with gaseous state uranium reaction temperature 800-1200 DEG C, 900 DEG C, 1100 DEG C etc. can also be taken, is specifically added with 800 DEG C, 1000 DEG C, 1200 DEG C in Example Agent and gaseous state uranium reaction temperature is added to be determined according to the temperature in boiler furnace.
In the inventive solutions, effect preferably H is given in implementation2SO4The concentration value of solution, but the present invention The H provided in being not limited to the above embodiments2SO4The concentration value of solution, H2SO4The concentration of solution is 50~150g/L, can take reality Apply 98g/L, 50g/L and 150g/L in example, can also take 60g/L, 70g/L, 80g/L, 90g/L, 100g/L, 110g/L, 120g/L, 130g/L, 140g/L etc., specific H2SO4The concentration of solution is determine according to actual needs.
In the inventive solutions, the concentration value of effect preferably HF solution is given in implementation, but the present invention is not It is limited to the concentration value of HF solution provided in above-described embodiment, the concentration of HF solution is 1~10g/L, can be in Example 5g/L, 2g/L, 10g/L, can also take 3g/L, 4g/L, 6g/L, 7g/L, 8g/L, 9g/L etc., the concentration of specific HF solution according to Actual needs determines.
In the inventive solutions, effect preferably H is given in implementation2O2The concentration value of solution, but the present invention is not It is limited to the H provided in above-described embodiment2O2The concentration value of solution, H2O2The concentration of solution is 10%~30%.It can be with Example In 10%, 20%, 30%, 15%, 25% etc. can also be taken, specific H2O2The concentration of solution is determine according to actual needs.
In the inventive solutions, the Adding Way of the additive is given in embodiment, but the present invention is unlimited The Adding Way of the additive provided in above-described embodiment, the Adding Way of additive can be to pass through addition in implementing Agent injection apparatus is ejected into boiler furnace, or system is added by additive and is added in coal handling system, can also be cooperated It uses, the Adding Way of specific additive is determines according to actual conditions.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, not to The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include Within protection scope of the present invention.

Claims (4)

1. a kind of method of uranium orienting enriching and extraction in coal combustion process comprising following steps:
(1) the content m of organically combine state uranium in coal is tested1；
(2) according to the content m for the organically combine state uranium tested in step (1)1, determine that the additive amount of additive is m2=k1·m1, Wherein k1For excess coefficient, k1=1.1~1.5；
(3) additive is ejected into burner hearth by additive injection apparatus, additive reacts generation with gaseous state uranium in burner hearth Solid-state uanate, the solid-state uanate are fixed in bottom ash；
(4) bottom ash through ball milling crusher machine and is sieved；
(5) bottom ash after being crushed and sieving is added to H2SO4In HF solution, H is used2O2Solution carries out oxidation leaching as oxidant Out；H is added to again to the residue after leaching2SO4In HF solution, H is used2O2Solution is leached as oxidant re-oxidation, i.e., The extraction of uranium in bottom ash can be achieved；
The additive and gaseous state uranium reaction temperature are 800-1200 DEG C, and the standard of the screening is 100-400 mesh, the H2SO4 The concentration of solution is 50~150g/L, and the concentration of the HF solution is 1~10g/L, the H2O2The concentration of solution be 10%~ 30%.
2. the method for uranium orienting enriching and extraction in a kind of coal combustion process according to claim 1, which is characterized in that institute Stating additive is alkali or alkaline earth metal oxide.
3. the method for uranium orienting enriching and extraction in a kind of coal combustion process according to claim 2, which is characterized in that institute Stating additive is CaO.
4. the method for uranium orienting enriching and extraction in a kind of coal combustion process according to claim 1, which is characterized in that institute Stating test method is sequential extraction experiments method and inductive coupling plasma mass spectrometry method.
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