123 results about "Density separation" patented technology

Processing recycled materials to recover plastics, copper wire, and other non-ferrous metals. Aspects of the invention employ density separation to separate plastic-bearing materials from copper-bearing materials. Plastic-bearing materials are further separated to separate light plastics from heavy plastics. Plastics are concentrated, extruded, and palletized. Copper and other valuable metals are recovered from copper-bearing materials using a water separation table.

A novel centrifuge bowl for processing particles suspended in a fluid is disclosed. The centrifuge bowl includes an annular cavity concentrically located about the rotation axis for suitably separating particles of similar densities but of different diameters. The cavity is preferably configured to have an annular cross sectional area, which is parallel to the rotation axis, that increases from a centrifugal side of the cavity toward a centripetal side of the cavity. This configuration allows to generate an almost rigidly rotating field upon rotation of the centrifuge bowl, which field helps to uniformly disperse Coriolis force throughout the circumference of the cavity to avoid turbulent mixing of the particles. In an alternative embodiment, the cavity is surrounded by an outer cavity for separating particles according to density before processing them through the inner cavity. This construction is particularly suitable for processing whole blood to harvest platelet-rich-plasma with reduced level of white blood cell contamination.

The present invention is related to a method for separating a first population of cells from a second population of cells in a sample by discontinuous density gradient separation using dense particles to target the first population of cells and a density separation medium (DSM) that is at least about 0.001 g/cm³ higher than the density of the second population of cells.

A method and system for processing and recycling infill material of artificial turf. The invention includes drying extracted infill material through a fluid bed dryer, the fluid bed dryer passes a process gas through a bed of solids via a perforated plate. The dried infill material is processed using a plurality of vibrating screens to remove excessively large or small particles from the infill material. The plurality of vibrating screens may be a set of progressively finer mesh screens. The processed infill material is separated by density. The density of the infill material may be determined by a high intensity, uniform sheet of laminar airflow. The separated infill material is discharged and is ready to be used again in another artificial turf. In one embodiment, the infill material includes at least one of graded sand, granulated styrene-butadiene rubber, cork, organic infill, thermoplastic elastomers, or ethylene propylene diene monomers.

The invention discloses a method and device for extracting microplastics in dewatered sludge. The method comprises the following steps: carrying out freeze-drying homogenization on the dewatered sludge, then adding a density solution and stirring to obtain turbid liquid, and standing until the turbid liquid is layered completely; transferring microplastics particles which float in a non-precipitating layer to a filter membrane under the effect of an air pump, and rapidly collecting the microplastics particles; continuously adding the density solution into a filter flask and keeping the solution parallel and level to a suction nozzle, and then washing a pipe for several times to transfer the microplastics particles adhered to the wall of the pipe to the filter membrane; adding the intercepted microplastics particles into a hydrogen peroxide solution, and carrying out shock reaction to remove organic matter impurities in the sludge; and drying to remove residual liquid, and cooling to obtain the final microplastics particles. The method has the advantages that the microplastics particles in the dewatered sludge are extracted on the basis of a density separation principle, and the method is rapid and simple to operate, low in sample demand quantity, high in microplastics particle recycling rate, good in reproducibility, high in practicality and widely applicable to ecological environment risk researches of the microplastics in the dewatered sludge.

The invention provides an enrichment device for quickly and continuously separating micro-plastics and a use method thereof. The device comprises a flotation liquid circulating part and a sample separating and enriching part, wherein the flotation liquid circulating part comprises a peristaltic pump, a liquid storing bottle, a flow meter, a suction filtration barrel, a vacuum pump and a guide pipe; the sample separating and enriching part comprises an ultrasonic generating device, a sample bottle, a flotation pipe, a stirring rod and multiple stages of sieving disks; the suction filtration barrel is placed in the ultrasonic generating device; the sample bottle is placed in the suction filtration barrel, the flotation pipe is assembled on the sample bottle, and finally, a plurality of sieving disks are nested outside the flotation pipe; the stirring rod is extended into the sample bottle; the suction filtration barrel is connected with the vacuum pump; and filter screens or filter membranes with different particle sizes are placed in the sieving disks. The device provided by the invention is designed based on the principle of density separation and has the following characteristics:the flotation liquid is circularly used among the three parts, so that the economic cost is lowered, and secondary pollution is avoided; and by the arrangement of the multiple stages of sieving disks, micro-plastic particles with different particle sizes can be continuously subdivided, so that the separation efficiency is high.

A method for recycling polymeric materials, including a mechanical separation step (B), a first density separation step (C), an intensive cleaning step (E), and a second density separation step (G, V) is described. Additional separation steps, such as a third density separation step (M, W), and optionally a fourth density separation step (G_a, G_b). Further less essential steps such as wetting (A), grinding (D), air flow separation (K), drying (I), electrostatic sorting (Z) and optional sorting (Z_a) steps may also be carried out to achieve optimized and refined separation. Polymeric materials from refuse or crushed motor vehicles may thus be separated, and polyethylene, polypropylene, polystyrene and acrylonitrile-butadiene-styrene resins may be recycled.

A method and system are for sorting shredder residues of metal-containing wastes, in particular of body shells Shredder residues are separated into a shredder light fraction and a non-ferromagnetic fraction (shredder heavy fraction). During the sorting of the shredder light fraction and the shredder heavy fraction in preliminary processes and a main process, a crude-sand fraction is produced by separating out at least a ferromagnetic fraction, a fraction containing nonferrous metals, a fiber fraction, and a granulate fraction. In a refining process, the crude-sand fraction is separated into a residual fraction rich in organics, a dust fraction containing heavy metals, a sand fraction depleted in organics and metals, and a metallic fraction, using the sequential process steps of density separation and metal separation.

A method for recycling polymeric materials, including a mechanical separation step (B), a first density separation step (C), an intensive cleaning step (E), and a second density separation step (G, V) is described. Additional separation steps, such as a third density separation step (M, W), and optionally a fourth density separation step (G_a, G_b). Further less essential steps such as wetting (A), grinding (D), air flow separation (K), drying (I), electrostatic sorting (Z) and optional sorting (Z_a) steps may also be carried out to achieve optimized and refined separation. Polymeric materials from refuse or crushed motor vehicles may thus be separated, and polyethylene, polypropylene, polystyrene and acrylonitrile-butadiene-styrene resins may be recycled.

There is disclosed apparatus and method for recycling waste paint, for completely removing a bad smell generated in the course of drying up the waste paint and extracting a bad smell from a filler. The method for recycling waste paint comprises the steps of: shaping the waste paint into a cake of a predetermine thickness while removing water from the waste paint using centrifugal force of a dehydrator; drying up and dehydrating the cake-shaped waste paint at about 80° C.~300° C. using a twin screw extruding method to remove water; drying up the waste paint dried up at the above step at about 100° C.~300° C. using a vacuum dry method to remove remaining water; pulverizing the waste paint dried up by the vacuum dry method into minute powder; separating the pulverized waste paint based upon density; and collecting and discharging dust, vapor, and gas generated during the above steps.

This invention relates to a system and process for recovering and recycling valuable target recycle materials such lost circulation material and weighting agents from drilling fluid used in hydrocarbon drilling operations. The system and process includes use of a binary fluid that is separate from the drilling fluid and has a designed density that allows separation of the valuable target recycle materials from drill cuttings. The solids are separated from the drilling fluid in a primary separation step and then mixed with the binary fluid in a density separation or enhanced mass separation device. The binary fluid density allows the separation device to distinguish the target recycle material from drilling solids and recycles the target material to the drilling operations for re-use in drilling fluid. The binary fluid is recovered and refreshed to maintain a generally continuous process of targeted recycling.

A system and computer-implemented method for characterizing hydrocarbon gas net pay zones in a subterranean reservoir including determining a sweet zone indicator from well log data, determining rock properties from well log data, and identifying one or more classes of net pay zones from the sweet zone indicator and rock properties. The sweet zone indicator may be determined by computing neutron-density separation and using the neutron-density separation and the well log data. The rock properties determined from the well log data may include total water saturation, adsorbed gas saturation, total gas content, porosity, propensity for hydraulic fracturing, uncertainty level of the total water saturation, uncertainty level of the total gas content, and baselines for the porosity and total gas content. Using the sweet zone indicator and rock properties, one or more classes of net pay zones can be identified.

A middle and high layer atmosphere density separation type detector comprises a universal module with a microsatellite platform, and is characterized by further comprising a spherical structural body shell used for simplifying an atmosphere resistance analysis model, an accelerometer, a GPS receiver and an attitude control system, the surface of the special structural body shell is covered with a solar cell, the accelerometer is arranged in the spherical structural body shell, the accelerometer is formed by distributing 4 to 6 static suspension type accelerometers around the axis, the accelerometer is used for measuring the atmosphere resistance, the GPS receiver is arranged in the spherical structural body shell and used for tracking and monitoring the track speed and the position of a microsatellite, the attribute control system is arranged in the spherical structural body shell and used for controlling the attribute of the microsatellite so as to keep the spinning of the satellite stable and ensure the correct directing of a GPS receiver antenna and a data transmission antenna.

The invention discloses a method for resource utilization of fluidized bed combustion ash residues. The method comprises the following steps of: mixing the fluidized bed combustion ash residues with water to obtain mortar, and crushing the mortar until the particle size is 1 to 20 micrometers; introducing flue gas of a coal-fired boiler until the pH value of the solution is lower than 7, and filtering to remove water to obtain the ash residues; mixing the ash residues with density separation liquid, collecting and separating out dross which floats on the surface layer of the solution; feeding material liquid into a centrifuge for centrifugally separating centrifugal residues of which the density is greater than that of the separation liquid; and filtering centrifugate in a filter to obtain residues, mxing the residues with the dross to obtain a mixture, activating the mixture in the absence of oxygen at a temperature of 300 to 500 DEG C, cooling and then crushing the mixture, cleaning the crushed mixture by using hydrochloric acid and water, and drying the cleaned mixture to obtain an adsorbent product. By adopting the method, adverse effects caused by calcium sulfite, unburned carbon granules and free calcium oxide on the products such as cement, concrete and the like are eliminated, and the calcium sulfite, the unburned carbon granules and other porous materials are separated from the products and used as useful waste water purification adsorbents, so that the utilization value of the fluidized bed combustion ash residues is improved.

The present invention discloses a system for separating minerals in drilling fluid based primarily on density. The separator creates and maintains a slurry with a controllable density for separating minerals from drill cuttings. The density if controlled through the use of an electrode array. The separator comprises a primary separation chamber containing the dense slurry, and a multiple number of secondary separation chambers used to separate cuttings from the drilling fluid. The invention also contains inlet hardware allowing the mixed mineral suspension to enter the first separation chamber, and hardware allowing the three outlet (separated) streams to exit the device. One of the three outlet streams carries the minerals that have a density greater than the user selectable density set point, while the second carries the minerals that have a density less than the density set point, and the third carries clean drilling fluid.

The invention relates to a density separation system based on light substances and heavy substances in household waste. The density separation system comprises an air separator, a cyclone separator and an induced draft fan. The air separator comprises a heavy substance collecting hopper and an air separation bin, the heavy substance collecting hopper is fixedly installed at the lower end of the air separation bin, an air inlet is formed in the connecting position of the heavy substance collecting hopper and the air separation bin, a heavy substance outlet is formed in the lower end of the heavy substance collecting hopper, a light substance outlet is formed in the upper end of the air separation bin, and a feed port is formed in the inclined lateral wall of the air separation bin. The light substance outlet of the air separator is connected with a tangent material inlet of the cyclone separator through a pipeline and an air outlet of the cyclone separator is connected with the induced draft fan through a pipeline. The density separation system is scientific and reasonable in structural design, stable in running, high in screening efficiency, high in processing speed and capable of effectively separating the light substances from the heavy substances.

Methods for increasing the amount of cenospheres in a fly ash sample are disclosed. The cenospheres are obtained in a dry state by using air as the “fluid” media for separation. In one version, the invention is a two step process, that is, screen by size followed by density separation such as in a fluidizing vertical column by density. In another version of the invention, the separation by density is followed by screening by size. Additional cycles can improve purity as defined by concentration of cenospheres.

A tube reactor having a substantially tubular body portion including a conical section, an entry port, an opposing exit port, and an axis extending between the ports through the body portion. The tubular body portion being rotatable about the axis. At least one reactant can be fed into the tubular body portion and directed toward the conical section. An inner surface of the tubular body portion receives the reactants from the conical section, and processes the reactants. An insert may be positioned within the tubular body portion to further process the reactants along the inner surface. A rotating reservoir having a damper can be coupled to the rotating tubular body portion. The damper receives the processed reactants from the inner surface of the tubular body portion, and guides the processed reactants into the rotating reservoir to minimize turbulence. The rotating reservoir then separates the processed reactants by density.

A method for processing low grade iron ores includes a step of receiving iron ore tailings. The method further includes separating the iron ore tailings into two or more groups based on sizes of the iron ore tailings. Each group includes a respective portion of the iron ore tailings. The method also includes processing the portion of the iron ore tailings in at least one group using a density separation process to generate iron ore concentrate.

The invention discloses a method for treating municipal domestic wastes, comprising the following steps of: placing corrodible organic materials taken as raw materials after being selected from the municipal domestic wastes into a fermentation tank provided with a mechanical stirring device; ventilating under negative pressure in the fermentation tank, wherein ventilation quantity is 0.05-0.2 m<3>air/m<3> windrow.min; stirring the organic materials through the mechanical stirring device inside the fermentation tank to form an aerobic state so as to ferment the organic materials for 25-30 days; composting the fermented organic materials for 25-40 days; and carrying out post treatment on the composted organic materials; and removing impurities, i.e. plastics, dinas, glasses, and the like, through screening and airflow density separation during the post treatment so as to prepare organic fertilizers. The invention can solve problem of high production and operation cost caused by great environmental influence of stench leakage, large static stacking occupying area, short fermentation period, long composting period, low treatment efficiency, large occupying area and high civil engineering investment of the warehouse type static aerobic fermentation of the organic materials included in the traditional municipal domestic wastes.

The present invention provides a method for separating plastics from metals in an electronic waste. The method comprises the following steps: (1) disassembling an electronic waste, performing functional detection on electronic elements in the electronic waste, and directly recovering electronic elements that are still functional; (2) breaking electronic elements that are already nonfunctional from step (1) to obtain materials having a grain size of 0.02 to 0.4 mm; (3) soaking the broken materials from step (2) in diesel oil and/or kerosene for 10-30 min; and (4) putting the soaked materials from step (3) in CaCl2 solution for density separation to separate plastics from metals. The method provided by the present invention allows a significant increase in the rate of separation of the plastics from metals and an increase in comprehensive use value of the electronic waste, and is simple in operation, environmentally friendly, and highly practical.

A process for recycling printed circuit boards includes pyrolyzing a number printed circuit boards to from an ash. Metals form the circuit boards are separated from the ash by density separation techniques. The metals are formed into a slurry electrode. The slurry electrode and a deposition electrode are placed in an electrolyte bath and the metals are electrorefined to form bars of metal. The slurry electrode is made by combining powderized metals with carbon powder and an ionic liquid to form an electrode paste. The electrode paste is placed inside a container with a screen to form the slurry electrode.