16 results about "Uranium tailings" patented technology

The invention discloses a pollution prevention and control effect experiment method for a uranium tailing pond and a pollution prevention and control method, and relates to the field of uranium tailing pond governing.The method comprises the steps that in-situ soil of the uranium tailing pond to be governed is collected, and the leveled in-situ soil serves as an experiment site; detecting the radon exhalation rate of the experimental field before the experimental field is covered; respectively adopting different materials to sequentially form total covering layers with different thicknesses on the experimental field according to a sequence from thin to thick, and detecting the radon exhalation rate when the experimental field is covered after the total covering layer is formed every time; according to the radon exhalation rate of the experimental site before and when the experimental site is covered, the pollution prevention and control effects of the total covering layer under different thicknesses and different materials are determined, and then a target covering scheme of the uranium tailings pond to be treated is determined; according to the method, the pollution prevention and control effects of different coverage schemes on the uranium tailing pond to be treated can be efficiently and systematically tested, so that the target coverage scheme of the uranium tailing pond to be treated can be determined.

According to the wastewater treatment device for synchronously removing uranium, manganese and ammonia nitrogen through the oxidation method and the using method, a novel pipeline mixer is adopted as a reaction device, compared with a traditional technology, a stirring device is omitted, the whole technological process is closed, no leakage risk exists, and the cost is low. An oxidizing agent hypohalite solution is added into the wastewater through a pipeline dosing port, and precipitates are removed after full reaction, so that the content of uranium, manganese and ammonia nitrogen in the wastewater can be greatly reduced. The method has the advantages of few types of chemicals, no need of special process, easiness in large-scale implementation, small occupied area and suitability for batch wastewater treatment of uranium tailings ponds and the like.

This invention provides a method for separating nickel-molybdenum-uranium ore through beneficiation and metallurgy, belonging to the field of beneficiation and metallurgical technology. The separation method provided by this invention includes the following steps: mixing nickel-molybdenum-uranium ore, a dispersant, an activator, an inhibitor, a collector, and a frother, followed by sequential frothing and flotation to obtain nickel-molybdenum concentrate and uranium-bearing tailings; subjecting the uranium-bearing tailings to acid leaching to obtain a leachate and tailings; adsorbing the leachate with a strongly basic anion exchange resin, followed by sequential solid-liquid separation, rinsing, and pH adjustment to obtain a uranium concentrate. Example results show that the recovery rates of nickel and molybdenum obtained by this invention are greater than 80%, the uranium leaching rate is greater than 96%, and the uranium recovery rate is greater than 91%.

This invention discloses a method for selectively separating uranium and radium, belonging to the field of solid waste treatment technology. The method utilizes modified rapeseed straw hydrothermal carbon (HTC-AA-Na). The hydrothermal carbon preparation method includes placing pretreated rapeseed straw in an aqueous acrylic acid solution for carbonization to obtain hydrothermal carbon HTC-AA rich in carboxyl functional groups; then, HTC-AA is placed in a NaOH solution and stirred, and the H groups in the carboxyl groups are removed through cation exchange. + Replaced with Na + HTC-AA-Na was obtained. When NaNO3 was added to a mixed solution containing uranium and radium, HTC-AA-Na selectively adsorbed uranium while hardly adsorbing radium; when EDTA-2Na was added to the same solution, HTC-AA-Na selectively adsorbed radium while hardly adsorbing uranium, thus achieving selective separation of uranium and radium. This invention provides a green and sustainable technical path for the harmless treatment of uranium tailings.

The present invention discloses a method for dividing and predicting radon stable zones in uranium tailings ponds. The method uses a combination of the range method and the variance method to divide the radon concentration data of the tailings pond into a radon concentration stable zone, an asymptotically stable zone, and an unstable zone. The radon concentration in the stable zone is then predicted based on the WOA-BP neural network algorithm, and the warning threshold is determined by the maximum value sequence and the minimum value sequence to establish an alarm relationship model. Through the above method, the present invention can effectively determine the radon concentration stable zone by combining the range method and the variance method. Compared with the direct prediction method, the prediction accuracy and warning scientificity are effectively improved. At the same time, the present invention adopts the WOA-BP algorithm that combines the advantages of the Whale Optimization Algorithm algorithm and the Back Propagation algorithm to ensure the accuracy and efficiency of the prediction results.

The invention discloses a method for extracting trace radium in uranium tailings. The method comprises the steps of tailings pretreatment, leaching, coprecipitation, dissolution and separation. According to the method, the characteristic that phosphate is difficult to dissolve is utilized, ions such as UO2 < 2 + >, Fe < 3 + >, Al < 3 + >, Ca < 2 + > and Ba < 2 + > existing in the uranium tailing leaching solution and Ra < 2 + > generate phosphate precipitates, synchronous enrichment of radium is achieved, after the radium is dissolved through diluted hydrochloric acid, the coexisting ions are separated and removed by utilizing the property difference between the coexisting ions and the Ra < 2 + >, and the radium-containing solution is obtained through purification. Compared with the prior art, the method has the advantages that the carbonate conversion step of sulfate is omitted, so that CO2 aerosol and radium-containing aerosol pollution generated by carbonate conversion is eliminated; the separation process time is shortened, and the operation difficulty is greatly reduced; barium ions are not additionally introduced in the whole process, and competitive ions similar to radium in property are greatly reduced; and the recovery rate of radium is improved by optimizing the leaching process.

The invention belongs to the technical field of water pollution remediation, and particularly relates to a method for treating seepage water of uranium tailings ponds containing thallium, uranium and manganese ore by synthesizing hydrotalcite-like compounds in real time. The method comprises the following steps: adding industrial solid waste into seeping water, uniformly mixing, adding an alkali source, and uniformly mixing; the industrial solid waste contains 10wt%-100wt% of slag powder and 0-90wt% of fly ash; the alkali source is selected from at least one of alkali metal hydroxide, oxide and basic salt; the method does not use a flocculating agent. Compared with the prior art, the raw materials and the process are innovative, and waste is turned into wealth; the cost is low; the treatment efficiency is high.

The invention discloses a low-grade uranium-gold polymetallic ore tailing solidification method. The method comprises the steps that S1, uranium tailing pretreatment is conducted, specifically, uranium tailings are screened and ground; s2, a curing additive is prepared, wherein uranium tailings, metakaolin, sodium hydroxide and a water reducing agent are prepared into mixed slurry according to the proportion of 100: 27: 54: 1; preparing a calcium chloride solution with the mass fraction of 15-25%; s3, curing is carried out, specifically, a peristaltic pump is adopted to sequentially inject the calcium chloride solution and the mixed slurry into the uranium tailings in the curing reaction container at a constant speed; and S4, curing and curing, wherein the curing reaction container subjected to grouting is subjected to standing and curing. According to the method, the pore structure of the uranium tailing solidified body is effectively improved, and the bonding strength among particles is enhanced. A gel network generated by alkali excitation reaction generates a chemical fixation effect on heavy metal ions, and meanwhile, the compressive strength and the penetration resistance of a solidified body are improved. The grouting process is accurately controlled, so that the consistency of the quality of a solidified body is guaranteed, and the common problem of weak local strength in a traditional method is avoided.

The invention provides a method for recovering and separating uranium and rare earth from uranium tailings, and belongs to the technical field of uranium tailing recovery. The method for recycling uranium and rare earth from uranium tailings comprises the following steps that the uranium tailings are subjected to first-stage acid leaching under the ultrasonic condition, and acid leaching residues and first acid leaching liquid are obtained; the acid leaching residues are subjected to alkali treatment under the ultrasonic condition, and alkali leaching residues are obtained; the alkaline leaching residues are subjected to second-stage acid leaching under the ultrasonic condition, and second acid leaching liquid is obtained; and the first acid leaching solution and the second acid leaching solution are mixed, and a leaching solution containing uranium and rare earth is obtained. The acid leaching residues are subjected to alkali treatment, gangue components such as silicon oxide can be altered, holes are formed, the corrosion effect of alkali on gangue can be enhanced under the ultrasonic effect, cracks are generated on the surfaces of mineral particles, and wrapping of gangue inclusions on uranium and rare earth is reduced; the ultrasonic cavitation effect can enhance generation of hydroxyl radicals, and the leaching rate of uranium and rare earth is increased.

The ZIF-8 / algae powder-based composite aerogel, preparation method and application thereof relate to the field of environmental engineering and material science technology. A novel chitosan / ZIF-8 / algae powder (ZIF-8 / CP / CS) composite adsorbent is synthesized for efficient adsorption of uranium ions in seawater. The results show that the adsorbent has good adsorption performance for uranium in the pH range of 4.0-8.0, and the adsorption rate is all above 89%. Mechanism analysis shows that the hydroxyl, amino, phosphoric acid groups on the surface of ZIF-8 / CP / CS and the C=N bond in ZIF-8 play a key role in the adsorption of uranium, and the quaternary phosphonium salt improves the competitiveness of the adsorbent for uranium. The competitive adsorption experiment shows that compared with the original ZIF-8 and ZIF-8 / C / CS without immobilized ionic liquid, the uranium vanadium ratio of ZIF-8 / CP / CS is increased by 20 times and 6 times respectively. The real uranium tailing pond wastewater is treated by adsorption, and the uranium content of the wastewater is reduced to 40 μg / L, so the adsorbent has good potential for extracting uranium from seawater and good application prospect for recovering uranium from uranium tailing wastewater.

The invention discloses a uranium pollution remediation method based on a microorganism-clay mineral synergistic effect, belongs to the field of environmental engineering, and carries out uranium pollution remediation on a strain WG2-6 screened from a uranium tailing area and a montmorillonite binary body under the optimal condition. Experiments show that the uranium removal rate of the system reaches 90% or above, and the fixed product is kept stable in the environment. The binary system fixes uranium through multiple mechanisms mediated by surface coordination, ion exchange and extracellular polymeric substances, microorganisms participate in uranium fixation through phosphorus-containing groups, protein components and the like, montmorillonite serves as a microorganism protection carrier and promotes increase of the content of protein in the strain WG2-6, and then uranium fixation of the strain WG2-6 is strengthened. The microorganism-mineral synergistic remediation system is constructed by using natural components in the soil, has the advantages of low cost, environment friendliness, high remediation efficiency and the like, and is suitable for remediation of uranium contaminated sites.

The present application belongs to the technical field of water pollution remediation, and particularly relates to a method for treating mine uranium tailing pond seepage water containing thallium, uranium and manganese by using real-time synthesized hydrotalcite-like compounds. The method comprises: adding industrial solid waste into the seepage water and mixing uniformly, and then adding an alkali source and mixing uniformly; the industrial solid waste contains 10wt%-100wt% of slag powder and 0-90wt% of fly ash; the alkali source is selected from at least one of alkali metal hydroxides, oxides and basic salts; and the method does not use a flocculant. Compared with the prior art, the present application realizes the transformation of waste into treasure by using raw materials and process innovation, has low cost, and has high treatment efficiency.

The invention relates to a leaching experiment device for natural radioactive elements in uranium tailings, and the leaching experiment device comprises a partition isolation unit which comprises a partition plate arranged in a box body and provided with micropores, the partition plate divides the interior of the box body into a tailings containing area and a leaching liquid storage area, the partition plate is provided with a micropore array with the aperture smaller than or equal to 0.2 mm, and the total area of the micropores accounts for 45%-55% of the surface area of the partition plate; according to the environment regulation and control unit, a vent hole is formed in the top of the box body and used for being connected with an independent air source pipeline and / or a vacuum pipeline, and electromagnetic valves and flow meters are arranged in the independent air source pipeline and the vacuum pipeline; the multi-parameter coupling unit is characterized in that a plurality of liquid adding ports are formed in the bottom of a leaching liquid storage area, at least two probe slots are formed in the top of the leaching liquid storage area, the liquid adding ports are connected with an acid-base reagent source, an oxidizing agent source and an electrolyte source respectively, and a pH electrode and an ORP probe can be inserted into the two probe slots respectively. According to the invention, efficient operation of a four-factor synchronous regulation experiment is realized, and technical support is provided for accurate prevention and control of uranium tailing pollution in a wet area.

The invention discloses a method for regulating Klebsiella to induce calcium carbonate precipitation to solidify uranium tailings by using xanthan gum, which comprises the following steps: 1) respectively and uniformly mixing xanthan gum with the mass of M gum and 1 / 2 M gum into uranium tailings to be reinforced to obtain a full / half sand-doped gum mixture; (2) inoculating the activated klebsiella into a liquid culture medium, and culturing to obtain a bacterium suspension for curing; (3) preparing a calcium acetate solution to obtain a fully-doped cementing solution for curing; weighing xanthan gum of which the mass is 1 / 2 M gum, equally dividing the xanthan gum into 14 equal parts, and dissolving the xanthan gum into a calcium acetate solution to obtain a semi-doping method cementing solution for curing; 4, the bacterial suspension and the corresponding full / semi-doped cementing fluid are injected into the full / semi-doped sand glue mixture to be reinforced, grouting is conducted 7 / 14 times, and the solidified uranium tailings are obtained.By means of the method, the mechanical strength, deformation resistance and integrity of a solidified body are remarkably improved, and performance emergence and directional optimization of the solidified body are promoted.

The application discloses a carbonate precipitation uranium tailings reinforcement and nuclide fixation co-precipitation method and application thereof, and belongs to the technical field of uranium tailing pond treatment. The method comprises the following steps: screening, identifying and domesticating a uranium tailings indigenous urea-decomposing strain HK-1 (Sporosarcina sp.), and optimizing the culture conditions of the strain by a response surface method; mixing high-activity bacterial liquid, a coagulation control agent, a calcium source and urea to construct a synergistic mineralization system; injecting the mineralization system into compacted uranium tailings by a permeation grouting method; and realizing the reinforcement of the uranium tailings and the co-precipitation fixation of uranium by constant-temperature and constant-humidity curing. The application significantly enhances the mechanical strength of the uranium tailings and the stability of nuclide fixation by improving the utilization rate of the calcium source and controlling the calcium carbonate crystal form by using the coagulation control agent. Under the optimal conditions, the compressive strength of the uranium tailings reinforced body can reach 1.986 MPa, the uranium removal rate can reach 84.3%, and the TCLP leaching rate is the lowest at 8.55%, so that the synergistic treatment of mechanical reinforcement and nuclide retardation is realized.

The application provides a green low-carbon uranium tailing leaching filling material and a preparation method thereof, and belongs to the technical field of mine filling and low-radioactivity solid waste disposal. The filling material comprises uranium tailings, cementitious material, lime, slump retaining agent and water, wherein the cementitious material comprises cement clinker, phosphorous slag powder, slag powder and silica fume; and the raw materials are mixed through specific steps, so that the synergistic effect among the raw materials is maximally enhanced, the fixation of nuclides and the strength of the filling material are maximally improved. The application adopts multi-source active solid waste as the main component of the filling cementitious material, which can not only inhibit the reverse acid of the uranium tailings, greatly improve the strength and late stability of the filling body, reduce the cost, but also effectively control the release and migration of radioactive nuclides; the utilization rate of the uranium tailings solid waste in the filling material is high, the value of the solid waste in the cementitious material is low, the source is wide, the low-carbon and environment-friendly disposal of the uranium tailings can be realized, and the application has good application prospect.