36results about How to "Economic recycling" patented technology

A molded article such as a floor tile is made from recycled carpet waste which includes a polyvinyl chloride component in the backing material and fiber component having a melting point above the melting point of polyvinyl chloride. A mixture of the recycled carpet material is shredded and additional polyvinyl chloride is fed to an extruder where the polyvinyl chloride is melted without melting the carpet fibers. The resulting mixture is discharged and molded, such as by injection molding, to form a molded product. The molded product includes a continuous matrix of polyvinyl chloride having recycled carpet fibers uniformly dispersed therein. The molded article contains about 45% to about 85% of polyvinyl chloride, about 5% to about 20% of recycled carpet fibers, up to about 5% of a plasticizer and up to about 5% of an ethylene copolymer by weight based on the total weight of the product. The finished product preferably contains about 10% to about 75% by weight of recycled vinyl-backed carpet and about 25% to about 90% by weight of a flexible polyvinyl chloride based on the total weight of the product.

Disclosed is a method for recycling silicon cutting waste mortar. The method comprises the steps of performing solid-liquid separation of the waste mortar; performing solid flow washing and vacuum filtration; drying the obtained filter cake, mixing with deionized water and performing activation reaction; adding water glass and sodium hydroxide successively and performing heating reaction, performing solid-liquid separation of the obtained product, performing ion exchange resin decolorization and distillation of the liquid phase to obtain silica sol, and performing solid phase washing and drying to obtain a silicon carbide raw material; and performing ultra precision filter of obtained liquid phase after solid-liquid separation of the waste mortar, adding a decoloring agent a filter aid to perform solid-liquid separation, reducing the conductivity, and heating and evaporating water to obtain finished polyethylene glycol cutting liquid. According to the technical scheme of the method, the flow line production is achieved, the silicon cutting waste mortar is recycled, the silica sol is prepared effectively, and the environmental pollution is reduced.

The invention relates to a method for recovering precious metal palladium from aniline tar. The method includes the following steps that aniline tar raw materials are heated to 80 DEG C, the PH is adjusted, a precious metal collector is added, constant temperature heating is carried out, stirring is carried out, standing depositing is carried out, cooling and filtering are carried out, filter residues are reserved and burned in a muffle furnace, ash is collected and reserved after burning is complete, mixed acid is added, boiling is carried out after stirring, complete dissolving is carried out, cooling and filtering are carried out, filter residues are collected and treated, filter liquor is reserved and is subject to concentration and nitre expelling, then iron replacement is carried out, cooling and filtering are carried out, filter liquor is subject to secondary recovering, filter residues are reserved and washed until water obtained after washing is neutral, filter residues are dried, coarse palladium is obtained, and the coarse palladium is refined to obtain sponge palladium. The method has the beneficial effects that the problem of losses of the palladium in the burning process is solved, the problem that palladium oxide is generated in the burning process is solved, the metal palladium recovering rate is improved, the recovering cost is reduced, and the recovering period is shortened.

The invention relates to nanometer materials, and specifically discloses a floating nanometer zero-valent iron material and a preparation method thereof. The floatable nanometer zero-valent iron material of the present invention is prepared from biomass adsorption particles with suspending or buoyant properties through iron adsorption loading and in-situ rapid reduction process; wherein, the preparation method of the biomass adsorption particles is as follows: : Breaking the biomass material, passing through a 40‑100 mesh sieve to obtain powder particles, stirring in water, wetting, standing still, collecting the floating particles to obtain biomass adsorption particles. The floatable nanometer zero-valent iron material provided by the present invention can be thrown in the polluted water body in a suspended or floating state, without settling to the bottom of the water body, thereby maintaining a more sufficient contact with the water body and a more continuous reaction, which is expected Obtain unique application effects in some special water purification.

The invention relates to a method for extracting and separating coal tar waste residue. The purpose of the present invention is to solve the technical problems existing in the existing method of solvent extraction and separation of coal tar waste residue, which easily cause secondary environmental pollution, expensive extraction agent, high operating cost and complicated process. The technical solution adopted in the present invention is, under normal temperature and pressure, using a composite extractant composed of furfural and ester solvents, through the steps of extraction, separation, distillation and washing, the tar, coal powder, and coke in the coal tar waste residue are extracted. In the process of extraction, the amount of the composite extractant used is 1 to 3 times the mass of the coal tar waste residue. The composition of the composite extractant of the invention is cheap and easy to obtain, all of which have low toxicity and high separation efficiency. The whole extraction and separation operation process is carried out under normal temperature and pressure conditions, the process is simple, and the energy consumption and operation cost are low.

The invention discloses a post-treatment method for polypropylene powder, which belongs to the field of petrochemical industry. For the existing polypropylene post-treatment process, "the polypropylene powder that leaves the polymerization system and undergoes preliminary gas / solid separation or enters the dryer, is indirectly heated by steam and nitrogen, removes hydrocarbons in the powder, and then enters the steam Nitrogen and water vapor are passed into the steamer to deactivate the catalyst; or enter the degassing chamber, and nitrogen containing water vapor is passed into the degassing chamber to improve: instead of passing nitrogen into the dryer, water vapor is passed into the dryer, and the It is transformed into a steam dryer that recovers hydrocarbons and deactivates the catalyst. The polymer after removing hydrocarbons enters the steamer (or degassing chamber, the same below), and nitrogen without water vapor is added into the steamer to deactivate the steam. The steamer is transformed into a dehumidifier for removing water vapor in the powder. The invention can completely recover the hydrocarbons leaving the polymerization system in an economical way, reduce unit consumption and energy consumption, and completely solve the problem of environmental protection.

A method and system for separating mixed waste into a wet organic fraction, a dry organic fraction and an inorganic fraction by: (i) shredding the mixed solid waste; (ii) sizing the shredding stream fractionation to produce two or more particle size waste streams; (iii) processing one or more of the particle size waste streams using density separation to produce an intermediate waste stream, and (iv) recovering homogeneous waste streams from the intermediate waste streams Products (for example, reusable materials or organic fuels).