54 results about "Low-level waste" patented technology

The invention relates to a method for recovering magnesium alloy low-level waste, aiming at the actual situation that the magnesium alloy low-level wastes are multiple in varieties, large in quantity, serious in pollution and difficult to recover. A magnesium alloy low-level waste ingot is prepared by mechanical cutting, repeated acid-washing, water washing, smelting in a resistance furnace, refining and casting into ingot; and the magnesium alloy low-level waste ingot has the chemical composition close to the composition quantity value index of a magnesium alloy ingot, and the mechanical property close to the quantity value of the magnesium alloy ingot, so as to be made into industrial part again. The recovery smelting and refining method is advanced, reasonable, short in process flow, low in environmental pollution, easy to recover, high in yield reaching up to 94.5%, good in material purity, and stable in metallographic structure and chemical composition, thus being an ideal method for recovering, smelting and refining the magnesium alloy low-level waste.

The invention discloses a reactor pool cleaning method used for miniature neutron source reactor decommissioning. The method includes the following steps: (1), theoretically calculating demarcation points of low level waste and deregulated waste; (2) sampling two points within the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (3), reasoning positions of the demarcation points according to nuclide specific activity and the position thereof; (4), sampling at positions closed to the outer sides of the demarcation points for gamma spectrum analysis to acquire radioactive nuclide specific activity; (5), comparing the acquired activity with a deregulating value, if the activity is smaller than the deregulating value, determining the positions to be the interface of the deregulating waste and the low level waste, peeling the portion within the positions and cleaning, and if the activity is larger than the deregulating value, repeating step (3) and (4) until the acquired activity is smaller than the deregulating value, and cleaning. By the method, sampling and measuring while peeling can be realized, secondary radioactive waste quantity can be reduced, and measuring workload and classifying time of radioactive waste can be reduced.

Dangerous wastes, such as very low level radioactive waste are processed and compacted under the form of flat cakes (12) stacked in metallic drums (10) closed by an intermediary lid (16) provided with a cap. A blocking material is then injected into the drum by an injection nozzle (42), after a toothed crown (38) surrounding this nozzle has perforated the cap. The toothed crown (38) is carried by a dynamic containment hood (28) in which there is also a circuit (44) for negative pressure application to the drum (10) and the hood. This circuit sucks out the contaminated air contained in the tank when it is perforated and during injection. The operation is thus carried out without risk of contaminating the workshop and the external surface of the drum.

The invention relates to a grabbing device used for medium-low-radioactivity waste barrels, and the grabbing device comprises a main support, a grabbing motor lead screw, a transmission nut disc and a plurality of single-claw components, wherein the grabbing motor lead screw is fixed in the center of the main support, the transmission nut disc is screwed with the grabbing motor lead screw through a thread, and moves vertically under the rotation driving of the grabbing motor lead screw, and the plurality of single-claw components are radially connected with the transmission nut disc and the main support; the grabbing motor lead screw rotates to drive the transmission nut disc to move vertically, and the plurality of single-claw components are pulled to synchronously concentrically fold or eccentrically unfold, uniform-stress non-destructive clamping or placement of the medium-low-radioactivity waste barrels is realized by a multi-claw mechanism, and automatic centering of the integral grabbing device to the medium-low-radioactivity waste barrels is realized by the rolling action of a universal wheel. By adopting the grabbing device, the stress condition of the waste barrels is improved, damage is avoided, the stability of the waste barrels in the air carrying process is improved, and automatic centering of the mechanical claws and the waste barrels in the hoisting process is realized.

The invention discloses a technology for low-temperature pyrolysis treatment of intermediate-and-low-radioactivity degradable waste. The technical process includes the steps that the intermediate-and-low-radioactivity degradable waste is subjected to low-temperature pyrolysis and converted into small-molecular combustible gas or solid coal slag, and the coal slag is subjected to a further oxidation reaction so that residual coal in the coal slag or waste which is not completely reacted thoroughly reacts; the gas is completely converted into oxidized gas through a thermal oxidation reaction, the gas is treated through a purification system so as to meet the standard and be exhausted, and the coal slag generated after oxidation is subjected to ceramic-like solidification. The technology solves the problems about storage and accumulation of degradable articles in the nuclear power industry, overcomes the defects of existing related treatment technologies, and achieves harmless volume reduction and weight reduction treatment of intermediate-and-low-radioactivity degradable products in the nuclear power industry or the military industry through pyrolysis heating and oxidation.

The invention belongs to the technical field of middle-low radioactive waste treatment equipment, relates to a waste treatment device, in particular to a middle-low radioactive waste treatment device. The middle-low radioactive waste treatment device is used for treating organic combustible type waste which is generated in a nuclear power plant and contains a middle-low radioactive substance, and is also used for treating middle-low radioactive waste generated in a hospital, a plant, a research institution and the like, so that volume reduction treatment and innocent treatment of the middle-low radioactive waste are achieved, and the middle-low radioactive waste treatment device comprises a pyrolysis reactor, a combustor, a catalytic converter, a spraying water scrubber and a high-temperature resistant pipeline, and all the devices are communicated through the high-temperature resistant pipeline; the middle-low radioactive waste treatment device makes it convenient for sealing up and landfill treatment of the waste, the volume reduction rate exceeds 95%, and the nuclear radiation pollution and atmospheric environmental pollution can be eliminated; a mild thermolcatalytic degradation process is adopted; the middle-low radioactive waste treatment device is simple in structure, reliable in principle, high in volume reduction rate, good in solidification effect, application environmentally friendly, low in investment and operation cost, and good in environmental protection effect, and has a good economic benefit and a wide market prospect.

The invention belongs to the technical field of low-and-intermediate level radioactive waste treatment devices, and relates to an integrated thermochemical treatment device for low-and-intermediate level radioactive wastes. The integrated thermochemical treatment device for the low-and-intermediate level radioactive wastes is used for treating organic combustible wastes containing radioactive substances produced by hospitals, scientific research institutions and nuclear power departments, solves the problems of insufficient combustion, easiness in blocking a pipeline through pyrolysis products, and higher clinker ignition loss, and realizes volume-reduction innocent treatment. A main body structure of the integrated thermochemical treatment device for the low-and-intermediate level radioactive wastes comprises a pyrolysis device and a combustion device, and is of an integrated structure; the pyrolysis products fall into a solid combustion chamber through a fire grate so as to be firedagain, so that the clinker ignition loss is reduced; a tapered feeding section realizes a sealing function; the diameter of a gas-liquid combustion chamber is larger than the diameter of the solid combustion chamber, so that the flue gas wind speed is retarded, and the fly ash quantity is reduced; and the integrated thermochemical treatment device for the low-and-intermediate level radioactive wastes is simple in overall structure, reliable in principle, compact in device, less in occupied area, high in volume reduction rate, good in curing effect, low in secondary pollution, friendly to an application environment, low in investment and operation cost, energy-saving, environmental-friendly, favorable in economic benefit and wide in market prospect.

The invention belongs to the technical field of intermediate- and low-level radioactive waste treatment and relates to an intermediate- and low-level radioactive waste treatment method. The intermediate- and low-level radioactive waste treatment method is achieved in an intermediate- and low-level radioactive waste treatment device and is used for treating organic combustible waste which contains radioactive substances and is generated by hospitals, factories, research institutions and nuclear power plants. The sludge volume reduction and the harmless treatment of the intermediate- and low-level radioactive waste are achieved. The sludge volume reduction rate is more than 95%. The difficulties of big deposit volume and difficult storage of the intermediate- and low-level radioactive waste are solved. Firstly, heating equipment is started, then a burner is started, then a spray water scrubber is started to carry out pre-treatment, then feedstock is carried out, the waste is pyrolyzed, burned, and experiences catalytic reaction, and finally, is purified and discharged. The process is simple in method, reliable in principle, high in sludge volume reduction rate, good in curing effect, environmentally friendly in application, low in investment and operation costs, energy-saving and environmentally friendly, and has a good economic benefit and a wide market prospect.

A device is provided for encapsulating a hand held electromagnetic radiation transceiver, the device comprising a hollow body having a top panel, a bottom panel, two side walls, and a front wall, said panels and walls continuously attached at their respective joints; a rear wall having an opening to allow insertion of the transceiver; whereby the device is finally hermetically sealed so as to prevent contamination of the transceiver by biological fluids, such as saliva, blood, and non-biological fluids, such as low-level radioactive waste, or organic materials. The device also contains indicators for pathogen and/or toxic agent contamination.

The invention provides a muon imaging method and a vehicle-mounted radioactive material monitoring system. The muon imaging method is characterized by comprising the following steps: S1, track reconstruction algorithm is used for carrying out reconstruction on muon angle measurement data, and an initial reconstruction image f0 is obtained; S2, the initial reconstruction image f0 serves as an initial value, algebraic reconstruction algorithm is used for iteration, and a reconstruction image fART is obtained; S3, several times of minimal total variation are carried out on the fART to obtain an image fART-TV; S4, the second step and the third step are repeated until a reconstruction image ft which can meet the preset quality can be obtained; and S5, the algebraic reconstruction algorithm is used for carrying out iteration on the ft and a final reconstruction image ffinal is obtained. Thus, radioactive monitoring can be carried out in real time, state changes of radioactive waste material in the transportation process can be particularly monitored, and thus hidden risks during the transportation process of the radioactive waste material can be reduced.

The invention discloses a radioactive waste liquid treatment method and device. The radioactive waste liquid treatment method comprises the steps that radioactive waste liquid is subjected to separation treatment to obtain first purified liquid and concentrated liquid; radioactive nuclide removal treatment is performed on the concentrated liquid to obtain second purified liquid, wherein the step of performing the radioactive nuclide removal treatment on the concentrated liquid includes chemical precipitation technology processing of the concentrated liquid; and the first purified liquid and the second purified liquid are discharged. The radioactive waste liquid treatment method and device have a higher radioactive waste liquid purification level, and can significantly reduce the amount ofradioactive waste generated, thereby achieving small quantification of the radioactive waste.

The invention belongs to the technical field of low-and-intermediate level radioactive waste and relates to a thermal chemical treatment method for low-and-intermediate level radioactive waste for treating low-and-intermediate level radioactive organic combustible waste comprising radioactive substances generated by hospitals, scientific research institutions and nuclear power units, solving the problem of great deposit volume and difficulty of storage of the low-and-intermediate level radioactive waste, and achieving volume reduction and harmless treatment of the low-and-intermediate level radioactive waste. 0.1-1% of the purified radioactive substance smoke sucked by a power device is exhausted from a smoke air outlet, and 99-99.9% of radioactive elements are left in incombustible ash residues to be sealed uniformly and cured with cement, so that the processing course of the low-and-intermediate level radioactive combustible waste is finished. The volume reduction ratio of the low-and-intermediate level radioactive organic combustible waste reaches 97-99%. The method is reliable in principle, high in volume reduction ratio, good in curing effect, low in secondary pollution, friendly in application environment, low in investment and operation costs and energy-saving and environment-friendly, and has a good economical benefit and a wide market prospect.

The embodiments of the invention provide a radioactive waste liquid treatment method and device. The radioactive waste liquid treatment method includes the steps that radioactive waste liquid is separated to obtain first purified liquid and concentrated liquid; and the concentrated liquid is subjected to ion exchanging treatment to obtain second purified liquid, wherein the first purified liquid and the second purified liquid are discharged, or the second purified liquid returns to a separation treatment process, and the first purified liquid is discharged, or part of the second purified liquid returns to the separation treatment process, and the first purified liquid and the rest part of the second purified liquid are discharged. According to the radioactive waste liquid treatment methodand device, the higher radioactive waste liquid purification level is achieved, meanwhile, the production amount of radioactive waste can be significantly decreased, and the radioactive waste is minified.

The invention belongs to the technical field of sampling operation of radioactive sites, and in particular relates to a radioactive storage tank sediment sampler and a using method of the radioactivestorage tank sediment sampler. The sampler comprises a sampling bowl, a scissor frame, a cylinder and a connecting piece; the sampling bowl is formed by closing two half-bowl structures, the front endof the scissor frame is fixedly connected with the sampling bowl, and the rear end of the scissor frame is connected with the cylinder through the connecting piece. The sampler adopts a long-distancemanually controlled cylinder to automatically clamp sediments in a radioactive waste liquid storage tank, and has the advantages of wide application range, flexible and convenient use and the like, and can realize sampling in a deformed container by penetrating through an arc-shaped channel or irregular channel through connecting a rigid sampling rod or a flexible sampling rod. The sampler can beused not only for sampling the sediments in low-level waste liquid storage tanks, but also can be suitable for sampling the sediments in medium and high-level waste liquid storage tanks and waste liquid, and realizing sampling operations in the field of chemical industry or other toxic and hazardous industries.