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102results about How to "Good for recycling" patented technology

Inflatable adjustable type construction mold for reserved hole in concrete structure plate, and construction method

The invention discloses an inflatable adjustable type construction mold for a reserved hole in a concrete structure plate, and a construction method. The mold comprises a cylinder formed by rolling of a rectangular iron sheet, a circular cover plate for plugging an upper end opening of the cylinder, and an inflatable air bag placed in the cylinder, wherein the cylinder is vertically arranged, and the outer diameter of the cylinder is the same as the hole diameter of the reserved hole needing to be constructed in the concrete structure plate; the inflatable air bag is a cylindrical air bag, and the inflatable air bag and the cylinder are coaxially arranged; and the bottom of the cylinder is supported on a shaping template of the concrete structure plate, the cylinder and the circular cover plate form an outer sleeve, and an outer sleeve fixing piece for fixing the outer sleeve is arranged on the shaping template. The construction method comprises the following steps of I, erecting the shaping template; II, performing measurement and paying-off; III, mounting the mold; IV, casting concrete; and V, dismantling the mold. The inflatable adjustable type construction mold disclosed by the invention is reasonable in design, simple and convenient to mount and dismantle, and good in use effects; after concrete is finally coagulated, the mold is dismantled, so that the quality of the constructed and shaped reserved hole can be effectively guaranteed, and the accuracy of the position of the reserved hole can be guaranteed.
Owner:THE TENTH CONSTR OF SHANXI CONSTR ENG GROUP OPERATE FUNCTION

Method for recovering copper from acidic copper-containing etching solution and preparing cuprous oxide

The invention discloses a method for recovering copper from an acidic copper-containing etching solution and preparing cuprous oxide. The method comprises the following steps of: S1, filtering the acidic copper-containing etching solution to obtain a crude copper-containing solution; S2, adjusting the pH of the crude copper-containing solution to 2-4, adding an extractant, mixing and stirring, standing for layering, wherein the upper layer is a primary copper-containing organic phase, and the lower layer is a primary water phase; recovering the primary water phase for an etching production line; S3, washing the copper-containing organic phase with deionized water, and separating to obtain a secondary copper-containing organic phase and a primary washing water phase; S4, adding sulfuric acid into the secondary copper-containing organic phase, fully stirring, standing for layering, wherein the upper layer is an extractant-containing organic phase, and the lower layer is a CuSO 4-containing water phase; S5, adding the primary washing water phase into the extractant-containing organic phase, washing, standing for layering to obtain a pure extractant organic phase for use in the step S2; and S6, preparing cuprous oxide from the CuSO 4-containing water phase by a hydrothermal method or a chemical precipitation method.
Owner:SICHUAN UNIV

Circuit board recovery method

The invention provides a circuit board recovery method, and relates to the technical field of circuit board recovery. The method comprises the steps of crushing circuit boards so as to obtain first crushing materials, and extracting ferromagnetic materials from the first crushing materials by utilizing a magnet, wherein the particle size of the first crushing materials is not larger than the firstsize; crushing the first crushing materials so as to obtain second crushing materials, and extracting ferromagnetic materials from the second crushing materials by utilizing the magnet, wherein the particle size of the second crushing materials is not larger than the second size; extracting particles of which the density is larger than the preset density with particles of which the air separationdensity is less than the preset density and particles of which the density is larger than the preset density; jigging and separating the particles of which the density is less than the preset density, and separating metal particles and first surplus materials from the particles of which the density is less than the preset density; and heating the first surplus materials to the preset temperatureso as to obtain gas, liquid and second surplus materials, and recovering the gas and the liquid. According to the circuit board recovery method disclosed by the invention, the waste of resources and environmental pollution can be avoided.
Owner:CHINA ENFI ENGINEERING CORPORATION

Method for extracting potassium chloride from sintering dust in iron and steel enterprises

The invention discloses a method for extracting potassium chloride from sintering dust in iron and steel enterprises. The method comprises the following steps: fully stirring a leaching solution and sintering dust under normal temperature and normal pressure conditions for 0.5-1 hour, conveying the formed slurry to a mechanical filter pressing unit after completion of leaching, performing solid-liquid separation on the slurry through the mechanical filter pressing unit, drying the leaching residues, returning to a sintering process, leaching the leaching solution again, allowing the leaching solution to enter a membrane process impurity removal unit, conveying the leaching solution to a quartz sand filter through a pump, filtering to remove particles in the liquid, performing micro-filtration treatment, and removing colloid in the liquid; finally, realizing separation of multivalent metallic impurities and potassium through nanofiltration, so as to obtain a refined potassium-containing pregnant solution, allowing the refined potassium-containing pregnant solution to enter a membrane distillation and crystallization unit, concentrating the potassium-containing pregnant solution by utilizing a low-temperature heat source of the iron and steel enterprises, cooling, so as to obtain a potassium chloride crystal. The method disclosed by the invention is simple in process, high in degree of automation and low in energy consumption, wastewater emission is avoided, and comprehensive utilization of harmful solid wastes in the iron and steel enterprises is realized.
Owner:WUHAN GREAT SEA HI TECH

Preparation method and application of corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification

The invention belongs to the technical field of chemical preparation of environmental materials, and particularly relates to a preparation method and application of a corncob biomass carbon dot composite Bi2WO6 photocatalyst based on magnetic Fe3O4 modification. The method comprises the following steps: step 1, treating a corncob precursor; step 2, preparing biomass carbon dots (CDs); step 3, preparing Bi2WO6; step 4, preparing Fe3O4; step 5, preparing CDs/Bi2WO6; and step 6, adding the CDs/Bi2WO6 obtained in the step 5 into the Fe3O4 nanosphere precursor solution obtained in the step 4, conducting heating in a polytetrafluoroethylene reaction kettle, washing the obtained product with ethanol and deionized water, and conducting drying for later use. The magnetic Fe3O4 modified corncob biomass carbon dot composite Bi2WO6 photocatalyst prepared by the method is used for photocatalytic degradation of tetracycline. The corncobs are applied to preparation of biomass carbon dots, so that waste is turned into wealth; and Fe3O4 is used as a composite material to prepare the composite photocatalyst, so that the catalyst can be recycled and reused, and the waste of resources is avoided. Thephotocatalyst has excellent photocatalytic activity and stability.
Owner:TONGHUA NORMAL UNIV
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