10 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.

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 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 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 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.