CN103204601B - Wastewater treatment method - Google Patents
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- CN103204601B CN103204601B CN201310143808.0A CN201310143808A CN103204601B CN 103204601 B CN103204601 B CN 103204601B CN 201310143808 A CN201310143808 A CN 201310143808A CN 103204601 B CN103204601 B CN 103204601B
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Abstract
The invention provides a treatment method of low-radioactivity wastewater with complex components and high salt content. The wastewater treatment method comprises the following steps of: removing ammonia by evaporating, and recycling ammonia vapor; removing solid substances and macromolecular substances in the wastewater by removing; adsorbing uranium after pre-treating the filtrate; leaching adsorbent, desorbing the uranium and regenerating the adsorbent; and carrying out concentration crystallization separation onto the uranium-removed wastewater to obtain the solid ammonium nitrate. The wastewater treatment method is capable of realizing the recycling of useful substances ammonia, uranium and ammonium nitrate without generating secondary liquid waste and waste.
Description
Technical field
The invention belongs to field of waste water treatment, relate to the treatment process of a kind of complicated component, supersalinity, low-activity waste water.
Background technology
Sol-gel method is prepared ceramic particle application more widely.The ceramic core core of high temperature gas cooled reactor nuclear fuel element adopts sol-gel method preparation.Core core has good security after multilayer coating structure, so have potential application prospect in the nuclear reactor types such as MSR, pressurized-water reactor.Spherical nucleus core preparation process is to comprise wet method and dry method two portions (Sol-Gel legal system is for spherical UO2 ceramic particle, Journal of Inorganic Materials, 2007,22(2), 259).Wherein wet method partly comprises dissolving, glue, dispersion, ageing, washing, drying and other steps.First, with analytically pure nitric acid heating for dissolving U3O8 pressed powder, prepare the uranyl nitrate aqueous solution, by certain formula and operation, be mixed with the colloid containing certain uranium concentration with multiple additives, comprising the organism such as urea, caking agent polyvinyl alcohol, linking agent tetrahydrofurfuryl alcohol that have complexing agent and buffer reagent effect concurrently; Then, glue is dispersed into even glue through pressure type vibrating nozzle and drips, and dropping liquid enters and in ammoniacal liquor post, is solidified into gradually gel ball behind ammonia district; The ageing in ammoniacal liquor of gained gel ball, then use weak ammonia detergent gel ball, to remove wherein ammonium nitrate; Finally, the moisture of removing wherein by vacuum-drying obtains desiccant gel ball.Therefore, can produce in process of production a large amount of low-activity waste water containing materials such as ammonia, uranium, organism, nitrate.
In order to meet the economic index of nuclear fuel element, by the effective reuse of the material in refuse, and reduce the harmful effect to environment, need carry out the recovery process research to Industrial Wastewater Treatment.At present for the method for Spent Radioactive water treatment, mainly contain method of evaporation, ion-exchange-resin process, membrane separation process (radioactive wastewater Processing Technology Research progress, Uranium, 2010,29(3), 153) etc.
Method of evaporation can make radioelement be concentrated and stay in debris, and its principle is that the waste water that enters vaporizer is heated to boiling by steam or electricradiator, and the moisture in waste water just flashes to water vapour gradually, through the cooling water that condenses into; Most radioelement are all stayed in residual solution and are concentrated.Its feature is to process middle and high horizontal radiation wastewater and has higher enrichment factor and df, but heat energy consumption is larger, and running cost is higher, simultaneously when design and operation, also needs to consider that fouling, blast, radioactivity the problem such as carry secretly.
Ion-exchange-resin process is the group that can mutually exchange with radioelement in waste water by ion exchange resin, and radioelement is adsorbed on exchange resin.With ion exchange method process low-level radioactivity, low salinity, waste water that turbidity is little often can access very high purification efficiency, correlation theory and equipment experience are all quite ripe; But can not process supersalinity waste water, because the competitive ion in water can cause the obvious decline of radioelement removal efficiency.
Membrane separation process is the film of selecting perviousness by having, and take pressure difference, temperature head, potential difference etc. is power, and liquid mixture is implemented to separated method.The membrane technique adopting in Spent Radioactive water treatment both at home and abroad at present mainly contains the methods such as micro-filtration, ultrafiltration, reverse osmosis, nanofiltration and electrodialysis.Membrane separation process processing radioactive wastewater has efficiently, economic, reliable advantage, but feedwater quality is also had to higher requirement, if also contain other a large amount of pollutents (as organism or a large amount of inorganic salt) in waste water system, can greatly affect the soil removability to radioactive substance.
Because component of effluent is complicated, contain gas chromatography, inorganic salt and low-level radioactive substance.Above method can be accomplished effective separation to the simple waste liquid of composition, but it is wastewater produced that sol-gel method is prepared to nuclear fuel, and various materials interact, and adopts conventional any method all can not realize wherein useful component of effective Separation and Recovery.For example, in conventional Spent Radioactive water treatment method, method of evaporation is applicable to processing middle and high radioactive wastewater, but it is very uneconomical to process low-level radioactive wastewater, except safety factors, also will consider the secondary pollution that the reasons such as entrainment cause; And high nitrate content in waste water has increased the wastewater treatment difficulty of ion exchange method and embrane method greatly.There is no up to now the technical process of a set of complete this waste water of processing, in the face of the commercialization trend of high temperature gas cooled reactor, fuel element is produced and is moved towards mass-producing, in the urgent need to the fuel element of a set of adaptation production requirement, manufactures method of wastewater treatment.
Summary of the invention
In order to solve the problem of prior art existence, the object of this invention is to provide a kind for the treatment of process of the supersalinity low-activity waste water for complicated component, the raw material that recovery can reuse (comprising ammonia, uranium and ammonium nitrate), reduces waste discharge amount.
In order to realize object of the present invention, the invention provides a kind for the treatment of process of waste water, comprise the following steps (as shown in Figure 1):
(1) by waste water evaporative removal ammonia, and reclaim ammonia steam;
(2) waste water filtering after step (1) processing is removed to solid matter and macromolecular substance;
(3) filtrate after filtering is carried out to pre-treatment, and carry out the absorption of uranium;
(4) to sorbent material drip washing, desorb uranium, adsorbent reactivation;
(5) step (3) except carrying out condensing crystal separation, the waste water after uranium is obtained to solid ammonium nitrate.As shown in Figure 1
Further, in step (1), in final waste liquid, the mass percent of ammonia is not more than 1%.To waste water evaporation except ammonia be filter and silica gel adsorption technique desired.Especially the ammonia (2～10mol/L) that contains higher concentration in fuel element manufacturing process waste water, ammonia is processed recovery process equipment to conventional uranium larger corrodibility and destructiveness, so first step of wastewater treatment is removal and the recovery of ammonia.By controlling temperature, the most ammonia in system can be steamed and be unlikely to too much water evaporation and cause solution thickness.Ammonia steam after evaporation absorbs with deionized water or weak ammonia condensation, and obtaining strong aqua can reuse in sol gel process.Evaporation removes in ammonia step, NH in final waste liquid
3when mass percent is not more than 1%, the carrying out smoothly of guarantee subsequent technique.
Further, in step (2), adopt one or more combination of organic microfiltration membrane, gac filter membrane or organic fibre ultra-filtration membrane, remove the solid impurity that is greater than 5 μ m in waste water, require water-quality COD <1000, turbidity <0.1NTU.
As preferably, while filtering solid matter and macromolecular substance, waste liquid passes through organic microfiltration membrane, gac filter membrane and organic fibre ultra-filtration membrane successively.
Be further used as preferably, organic microfiltration membrane aperture size is 0.1-1 μ m, and organic fibre ultra-filtration membrane aperture size is 50-500nm.
After processing, in water, being greater than 5 μ m solid impurities can all remove, and molecular weight is greater than the macromolecule organic of 5KD and can removes more than 95%.
Further, in step (3), filtrate is carried out pre-treatment, regulates pH value to 7-8.5.
Further, in step (3), uranium absorption adopts porous silica gel filled column, and breakthrough point uranium concentration is 0.05mg/L.
Filtrate is by containing the filled column of sorbent material, and uranium can be adsorbed on sorbent material by selectivity, and nitrate concentration is adsorbed hardly.According to the process requirements of recover ammonium nitrate, breakthrough point uranium concentration is 0.05mg/L.
Further, in step (4), when filled column absorption reaches after breakthrough point, with leacheate drip washing sorbent material, when effluent liquid uranium concentration is not less than 1g/L, be drip washing qualifying liquid, by precipitating with alkaline reagents, and separated; When effluent liquid uranium concentration is less than 1g/L, be drip washing lean solution, return to step (3) and again carry out uranium absorption.
Particularly, leacheate is strongly acidic solution, is preferably nitric acid.
The further recovery of above-mentioned uranium, by adding alkaline reagents, is separated out uranium in solution with sedimentary form.By centrifugal or filtration, obtain uranium-bearing solid chemical compound again.
Filled column after above-mentioned desorption, particularly porous silica gel filled column, after drip washing desorption, can regenerate, and continues to use.
Except main component in waste water after uranium is ammonium nitrate, the effluent liquid before breakthrough point is concentrated, by evaporation, make ammonium nitrate concentrated.In order to reduce ammonium nitrate solution overrich, produce potential safety hazard and guarantee ammonium nitrate energy crystallisation by cooling simultaneously, concentrated solution mass percent concentration is preferably 5-12%.
Concentration liquid of ammonium nitrate after evaporation concentration is placed naturally cooling under room temperature, and oversaturated ammonium nitrate is separated out with crystalline form, and above process is a crystallization.Gained crystal by adopting filtration method makes solid-liquid separation, separated rear with a small amount of saturated ammonium nitrate solution cleaning; Scavenging solution and 4-5 criticize a crystallization mother liquor and concentrate, and evaporate to subtract to hold and secondary crystallization.Crystalline mother solution after secondary crystallization is treated further processing.
The vaporize water that evaporative process produces is for industrial production reuse.
The present invention also provides the application of above-mentioned method of wastewater treatment in processing supersalinity low-activity waste water.
Preferably, the nitrate concentration 5-50g/L of described waste water, organic cod 10
3-4 * 10
5, ammonia concentration is greater than 5g/L, metal ingredient concentration range 0.05-50mg/L.
Beneficial effect of the present invention is: the treatment process that a set of complete supersalinity low-activity waste water for complicated component is provided; Realized the recovery of useful matter ammonia, uranium and ammonium nitrate; Substantially do not produce secondary waste liquid refuse.
The present invention, except can be used for the processing of process waste liquor in the production of high temperature gas cooled reactor fuel element core core, also can prepare for common sol gel the processing of the similar waste water of ceramic process composition.
Accompanying drawing explanation
Fig. 1 is the process flow sheet of a kind of method of wastewater treatment of the present invention.
Embodiment
Following examples are used for illustrating the present invention, but are not used for limiting the scope of the invention.
Embodiment 1
In certain batch of fuel element production process, have an appointment 250 liters and need to process containing ammonia process waste water, NH in former water
3-N mass concentration is 8.9%, and uranium concentration is about 10mg/L left and right, and ammonium nitrate concn is 12.4g/L, organic cod value 4 * 10
4.For realizing removal and the recovery of main component in waste water, take following scheme: method of evaporation reclaims ammonia → filtration and removes solid impurity and organic macromolecule → silica gel adsorption → desorb recovery uranium → crystallization process recovery ammonium nitrate (as shown in Figure 1).
First waste water heat by evaporating kettle in evaporation ammonia removal device, and the ammonia steaming absorbs with deionized water.In except waste water after ammonia, ammonia mass concentration is reduced to 0.9%, and obtains the reuse ammoniacal liquor that concentration is 13.1% left and right.
Except waste water after ammonia filters assembled unit through organic microfiltration membrane (aperture size 1 μ m), gac filter membrane and organic fibre ultra-filtration membrane (φ 100nm), remove solid impurity and macromolecular substance, to guarantee the water inlet requirement of silica gel adsorption unit, improve treatment effect.Filtering unit inlet pressure value is between 0.26-0.35MPa, and top hole pressure is between 0.10-0.22MPa.After filtering unit, the intensity of variation of other compositions is: uranium clearance is 4.5%, nitrate removal rate is 1.8% left and right, it is 82.3% that larger molecular organics goes (KD>500) to remove rate, and small organic molecule (KD<500) clearance is 1.9%.
Waste water after filtration treatment enters silica gel adsorption unit.Selecting granularity is that 100-200 order, specific surface area are 550m
2the silica gel of/g is as sorbent material, and 50g silica gel is contained in the glass column of φ 3cm.Waste water ph is adjusted to 8.1, by peristaltic pump, pumps into silica gel adsorption column, Uranium in Waste Water can be adsorbed by selectivity, and in effluent liquid, uranium content can be reduced to below 0.05ppm, and nitrate radical is not adsorbed.Under this pH condition, the loading capacity of silica gel is 22.3mg/g silica gel.
Silica gel is reversible to the sorption and desorption process of uranium.Silica gel adsorption reaches after breakthrough point, and adopting concentration is 1mol L
-1hNO
3solution gets off the uranium drip washing of absorption.Uranium concentration is concentrated higher than 1g/L drip washing qualifying liquid, and obtaining uranium concentration is the concentrated stripping liquid of 102g/L, realizes the recovery of uranium by further chemical precipitation, the method such as centrifugal; Uranium concentration is back to silica gel adsorption processing lower than the drip washing lean solution of 1g/L; When uranium concentration is lower than 0.05mg/L in effluent liquid, take deionized water drip washing silica gel to effluent liquid as neutral, silica gel recycles.
Adsorption uranium breakthrough point is decided to be to 0.05mg/L.Effluent liquid before breakthrough point is concentrated, and every 5L is a collection of pending liquid, by evaporation, is heated and is made ammonium nitrate concn to 9.1% in solution, stops heating and places cooling in room temperature.The ammonium nitrate crystal of separating out is filtered, with seasoning after saturated ammonium nitrate solution washing; 5 batches of crystallization post crystallization mother liquors are concentrated, carried out secondary and subtract appearance crystallization, secondary crystal mother liquor subtracts and holds to 1.8% of original volume, treats further processing.In gained ammonium nitrate product, uranium mass concentration mean value w (U) is 4.5 * 10
-7, than the limit standard 2 * 10 of regulation
-6(document) approximately low 1 order of magnitude.
Embodiment 2
Certain batch of sol gel processing is prepared in uranium oxide ceramics particle manufacture process and is had an appointment 200 liters and need to process containing ammonia process waste water, NH in former water
3-N mass concentration is 1.3%, and uranium concentration is about 50mg/L left and right, and ammonium nitrate concn is 5g/L, organic cod value 4 * 10
5.For realizing removal and the recovery of main component in waste water, take following scheme: method of evaporation reclaims ammonia → filtration and removes solid impurity and organic macromolecule → silica gel adsorption → desorb recovery uranium → crystallization process recovery ammonium nitrate.
First waste water heat by evaporating kettle in evaporation ammonia removal device, and the ammonia steaming absorbs with deionized water.In except waste water after ammonia, ammonia mass concentration is reduced to 0.8%, and obtains the reuse ammoniacal liquor that concentration is 11.1% left and right.
Except waste water after ammonia filters assembled unit through organic microfiltration membrane (aperture size 0.1 μ m), gac filter membrane and organic fibre ultra-filtration membrane (φ 500nm), remove solid impurity and macromolecular substance, to guarantee the water inlet requirement of silica gel adsorption unit, improve treatment effect.Filtering unit inlet pressure value is between 0.26-0.35MPa, and top hole pressure is between 0.10-0.22MPa.After filtering unit, the intensity of variation of other compositions is: uranium clearance is 2.5%, nitrate removal rate is 1.3% left and right, it is 75.3% that larger molecular organics goes (KD>500) to remove rate, and small organic molecule (KD<500) clearance is 1.2%.
Waste water after filtration treatment enters silica gel adsorption unit.Selecting granularity is that 100-200 order, specific surface area are 550m
2the silica gel of/g is as sorbent material, and 50g silica gel is contained in the glass column of φ 3cm.Waste water ph is adjusted to 8.5, by peristaltic pump, pumps into silica gel adsorption column, Uranium in Waste Water can be adsorbed by selectivity, and in effluent liquid, uranium content can be reduced to below 0.05ppm, and nitrate radical is not adsorbed.Under this pH condition, the loading capacity of silica gel is 20.5mg/g silica gel.
Silica gel is reversible to the sorption and desorption process of uranium.Silica gel adsorption reaches after breakthrough point, and adopting concentration is 1mol L
-1hNO
3solution gets off the uranium drip washing of absorption.Uranium concentration is concentrated higher than 1g/L drip washing qualifying liquid, and obtaining uranium concentration is the concentrated stripping liquid of 45g/L, realizes the recovery of uranium by further chemical precipitation, the method such as centrifugal; Uranium concentration is back to silica gel adsorption processing lower than the drip washing lean solution of 1g/L; When uranium concentration is lower than 0.05mg/L in effluent liquid, take deionized water drip washing silica gel to effluent liquid as neutral, silica gel recycles.
Adsorption uranium breakthrough point is decided to be to 0.05mg/L.Effluent liquid before breakthrough point is concentrated, and every 5L is a collection of pending liquid, by evaporation, is heated and is made ammonium nitrate concn to 9.5% in solution, stops heating and places cooling in room temperature.The ammonium nitrate crystal of separating out is filtered, with seasoning after saturated ammonium nitrate solution washing; 5 batches of crystallization post crystallization mother liquors are concentrated, carried out secondary and subtract appearance crystallization, secondary crystal mother liquor subtracts and holds to 1.5% of original volume, treats further processing.In gained ammonium nitrate product, uranium mass concentration mean value w (U) is 2.7 * 10
-7, than the limit standard 2 * 10 of regulation
-6(document) approximately low 1 order of magnitude.
Embodiment 3
Certain batch of sol gel processing is prepared in uranium oxide ceramics particle manufacture process and is had an appointment 100 liters and need to process containing ammonia process waste water, NH in former water
3-N mass concentration is 5.7%, and uranium concentration is about 0.05mg/L left and right, and ammonium nitrate concn is 50g/L, organic cod value 10
3.For realizing removal and the recovery of main component in waste water, take following scheme: method of evaporation reclaims ammonia → filtration and removes solid impurity and organic macromolecule → silica gel adsorption → desorb recovery uranium → crystallization process recovery ammonium nitrate.
First waste water heat by evaporating kettle in evaporation ammonia removal device, and the ammonia steaming absorbs with deionized water.In except waste water after ammonia, ammonia mass concentration is reduced to 0.9%, and obtains the reuse ammoniacal liquor that concentration is 10.2% left and right.
Except waste water after ammonia filters assembled unit through organic microfiltration membrane (aperture size 0.1 μ m), gac filter membrane and organic fibre ultra-filtration membrane (φ 50nm), remove solid impurity and macromolecular substance, to guarantee the water inlet requirement of silica gel adsorption unit, improve treatment effect.Filtering unit inlet pressure value is between 0.26-0.35MPa, and top hole pressure is between 0.10-0.22MPa.After filtering unit, the intensity of variation of other compositions is: uranium clearance is 2.0%, nitrate removal rate is 1.5% left and right, it is 78.9% that larger molecular organics goes (KD>500) to remove rate, and small organic molecule (KD<500) clearance is 1.0%.
Waste water after filtration treatment enters silica gel adsorption unit.Selecting granularity is that 100-200 order, specific surface area are 550m
2the silica gel of/g is as sorbent material, and 50g silica gel is contained in the glass column of φ 3cm.Waste water ph is adjusted to 7.0, by peristaltic pump, pumps into silica gel adsorption column, Uranium in Waste Water can be adsorbed by selectivity, and in effluent liquid, uranium content can be reduced to below 0.05ppm, and nitrate radical is not adsorbed.Under this pH condition, the loading capacity of silica gel is 29.0mg/g silica gel.
Silica gel is reversible to the sorption and desorption process of uranium.Silica gel adsorption reaches after breakthrough point, and adopting concentration is 1mol L
-1hNO
3solution gets off the uranium drip washing of absorption.Uranium concentration is concentrated higher than 1g/L drip washing qualifying liquid, and obtaining uranium concentration is the concentrated stripping liquid of 87g/L, realizes the recovery of uranium by further chemical precipitation, the method such as centrifugal; Uranium concentration is back to silica gel adsorption processing lower than the drip washing lean solution of 1g/L; When uranium concentration is lower than 0.05mg/L in effluent liquid, take deionized water drip washing silica gel to effluent liquid as neutral, silica gel recycles.
Adsorption uranium breakthrough point is decided to be to 0.05mg/L.Effluent liquid before breakthrough point is concentrated, and every 5L is a collection of pending liquid, by evaporation, is heated and is made ammonium nitrate concn to 10.8% in solution, stops heating and places cooling in room temperature.The ammonium nitrate crystal of separating out is filtered, with seasoning after saturated ammonium nitrate solution washing; 5 batches of crystallization post crystallization mother liquors are concentrated, carried out secondary and subtract appearance crystallization, secondary crystal mother liquor subtracts and holds to 1.5% of original volume, treats further processing.In gained ammonium nitrate product, uranium mass concentration mean value w (U) is 3.2 * 10
-7, than the limit standard 2 * 10 of regulation
-6(document) approximately low 1 order of magnitude.
Although above the present invention is described in detail with a general description of the specific embodiments, on basis of the present invention, can make some modifications or improvements it, this will be apparent to those skilled in the art.Therefore, these modifications or improvements, all belong to the scope of protection of present invention without departing from theon the basis of the spirit of the present invention.
Claims (9)
1. a treatment process for waste water, comprises the following steps:
(1) by waste water evaporative removal ammonia, and reclaim ammonia steam;
(2) waste water filtering after step (1) processing is removed to solid matter and macromolecular substance;
(3) filtrate after filtering is carried out to pre-treatment, and carry out the absorption of uranium;
Described filtrate is carried out to pre-treatment for regulating filtrate pH value to 7-8.5;
(4) to sorbent material drip washing, desorb uranium, adsorbent reactivation;
(5) step (3) except carrying out condensing crystal separation, the waste water after uranium is obtained to solid ammonium nitrate.
2. method of wastewater treatment as claimed in claim 1, is characterized in that, in step (1), in final waste liquid, the mass percent of ammonia is not more than 1%.
3. method of wastewater treatment as claimed in claim 1, it is characterized in that, in step (2), adopt one or more combination of organic microfiltration membrane, gac filter membrane or organic fibre ultra-filtration membrane, remove the solid impurity that is greater than 5 μ m in waste water, require water-quality COD <1000, turbidity <0.1NTU.
4. method of wastewater treatment as claimed in claim 3, is characterized in that, while filtering solid matter and macromolecular substance, waste liquid passes through organic microfiltration membrane, gac filter membrane and organic fibre ultra-filtration membrane successively.
5. method of wastewater treatment as claimed in claim 4, is characterized in that, organic microfiltration membrane aperture size is 0.1-1 μ m, and organic fibre ultra-filtration membrane aperture size is 50-500nm.
6. method of wastewater treatment as claimed in claim 1, is characterized in that, in step (3), uranium absorption adopts porous silica gel filled column, and breakthrough point uranium concentration is 0.05mg/L.
7. method of wastewater treatment as claimed in claim 1, is characterized in that, in step (4), when filled column absorption reaches after breakthrough point, with leacheate drip washing sorbent material, when effluent liquid uranium concentration is not less than 1g/L, be drip washing qualifying liquid, by precipitating with alkaline reagents, and separated; When effluent liquid uranium concentration is less than 1g/L, be drip washing lean solution, return to step (3) and again carry out uranium absorption.
8. the application of the method for wastewater treatment described in claim 1-7 any one in processing supersalinity low-activity waste water.
9. application as claimed in claim 8, is characterized in that, the nitrate concentration 5-50g/L of described waste water, organic cod 10
3-4 * 10
5, ammonia concentration is greater than 5g/L, metal ingredient concentration range 0.05-50mg/L.
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| CN103440894A (en) * | 2013-08-12 | 2013-12-11 | 清华大学 | Process for treating high-ammonia radioactive wastewater by membrane absorbing method |
| CN103474122B (en) * | 2013-09-04 | 2016-02-10 | 清华大学 | The minimizing technology of tetrahydrofurfuryl alcohol in a kind of high temperature nuclear reactor fuel element factory effluent |
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| CN108257706B (en) * | 2016-12-29 | 2021-03-02 | 中核建中核燃料元件有限公司 | Uranium-containing wastewater treatment method |
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| CN110204136A (en) * | 2019-04-07 | 2019-09-06 | 李英劼 | The method that electroplating waste water resource utilizes |
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| CN102031369B (en) * | 2010-12-01 | 2013-03-20 | 核工业北京化工冶金研究院 | Method for extracting uranium by using ion exchange fixed tower under alternate Ph condition |
| CN102101682A (en) * | 2010-12-23 | 2011-06-22 | 苏州市创新净化有限公司 | Continuous dehydration distillation purification system and process method for ammonia |
| CN102876890A (en) * | 2012-10-24 | 2013-01-16 | 南华大学 | Method for recovering uranium from beryllium uranium ore with wet process |
| CN102976543A (en) * | 2012-12-18 | 2013-03-20 | 深圳市能源环保有限公司 | Garbage leachate disposal method and system |
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