47results about How to "To achieve the purpose of resource recycling" patented technology

A method for separating and recovering crystallized phenol from a phenol-containing dilute solution comprises the following steps: circulating and introducing low-concentration phenol waste water or a solution into a pervaporation device, enriching phenol steam into a low-vacuum phenol collector cooled by liquid nitrogen by using a pervaporation membrane with excellent selectivity to phenol, adding a metal wire mesh filler into the collector as a substrate for phenol crystallization. The invention can be used for treatment of waste water containing low-concentration phenol and can recover crystallized phenol; no chemical reagent is needed to be added, which eliminates secondary pollution; the invention realizes energy saving, emission reduction and resource recovery of waste water, and isenvironment-friendly high-efficient separation technology.

The invention belongs to the fields of comprehensive resource recycle and superfine metal pre-alloyed powder preparation, and particularly relates to a comprehensive resource recycling method for a waste diamond tool. The method comprises the following steps: firstly, reclaiming diamond and tungsten carbide grains from the waste diamond tool through acid dipping and filtering processes; and detecting components of leachate by adopting atomic absorption spectrum, adjusting the components and the concentration by adding corresponding soluble salt and deionized water into the leachate, and preparing superfine pre-alloyed powder through various non-ferrous metals in the mother solution by adopting a chemical coprecipitation-reduction process. The method can furthest reclaim the diamond and tungsten carbide grains from the waste diamond tool; the prepared superfine pre-alloyed powder can be directly applied to the production of the diamond tools; and the method avoids the complex metal ionseparation processes such as extraction and impurity removal and the like adopted in the traditional metal reclamation, has the characteristics of simple process, low cost and the like, and is easy for industrialized mass production.

The invention discloses a method of recycling organic substances from polyurethane synthetic leather waste gas. In the method, an ionic liquid and a liquid ester are employed as special absorbers. In an absorption column, cooled synthetic leather waste gas which flows countercurrent is treated in a low-temperature spray manner, wherein organic substances, such as methylbenzene, butanone and DMF, in the waste gas are absorbed by a low-temperature absorber. The absorber then is fed into a desorption column to carry out desorption and separation to recycle the methylbenzene and butanone, and then is fed into a pressure-reduced distillation column to carry out desorption and separation to recycle the DMF. The special absorber contains 50-70% of the ionic liquid, 5-25% of dibutyl terephthalate, 15-25% of butylene terephthalate and 5-15% of ethylene glycol m-phthalate. The special absorber is more than 300 DEG C in boiling point and is suitable for absorbing the methylbenzene, butanone and DMF. The method can recycle the DMF and the methylbenzene at high recycle efficiency, wherein the recycled DMF is more than 99% in purity and low-boiling-point organic substances, such as the recycled methyl and butanone, are more than 99.5% in purity.

The invention discloses a molecular sieve synthesis mother solution using method. The molecular sieve synthesis mother solution using method comprises the following steps: 1, conducting settling separation on a suspended matter of a mother solution to obtain a supernatant liquor, wherein the content of the suspended manner in the supernatant liquor is less than 0.1 g / L; 2, adding lime milk into the supernatant liquor obtained in the step 1), desiliconizing, wherein the content of SiO2 in the desiliconized supernatant liquor is less than or equal to 0.5 g / L; 3, taking the supernatant liquor desiliconized in the step 2) as a clinker in the sintering-process aluminum oxide production technique to dissolve out a regulating solution. The molecular sieve synthesis mother solution using method has the following beneficial effects: the problem that the caustic alkali in the molecular sieve synthesis mother solution cannot be recycled is solved, and the problems of the environment risks that the caustic alkali is directly neutralized by sulfuric acid and is discharged are changed. The method directly combines the production process of a molecular sieve with the production process of aluminum oxide, by removing the silicon in the solution, the molecular sieve synthesis mother solution is desiliconized to dissolve out the clinker, and the dissolved sodium metaaluminate solution is taken as a raw material in the synthesis of the molecular sieve, so that the purposes of recycling of the resources and zero emission are fulfilled.