6results about How to "Low leaching rate" patented technology

The invention discloses an in-situ leaching liquid injection system and method for high-altitude ionic rare earth ore, and belongs to the field of rare earth hydrometallurgy. The system is composed of a liquid injection well pattern, a layered liquid injection device, a first liquid supply system, a second liquid supply system and a collection system. Exploring the thickness of an ore body weathering crust and vertical distribution of rare earth / impurities; the liquid injection hole is vertically divided into an upper layer liquid injection area (1 / 3-1 / 2 of the upper part) and a lower layer liquid injection area (1 / 2-2 / 3 of the lower part); a 1.0-1.4 wt% low-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the upper layer, and co-leaching of impurities such as aluminum and iron is reduced; 1.5-2.5 wt% of high-concentration diethylenetriamine-ammonium acetate composite leaching agent is injected into the lower layer to ensure efficient leaching of rare earth; and rare earth-rich leaching liquid is collected. Compared with a traditional full-layer high-concentration process, the method has the advantages that the use amount of a leaching agent is reduced by 20-40% while the rare earth leaching rate is kept to be larger than or equal to 90%, the aluminum ion concentration of the leachate is reduced by 30-60%, the agent cost and the follow-up impurity removal load are remarkably reduced, and the method is particularly suitable for the high-altitude, low-temperature, low-air-pressure and thick-weathered crust environment.

This invention discloses a method for preparing and applying a cobalt-doped two-dimensional carbon nitride nanosheet catalyst, belonging to the field of catalytic material preparation and water pollution treatment technology. The catalyst is based on graphitic carbon nitride, with cobalt ions loaded in its structural cavities via Co-N coordination bonds. The preparation method includes: mixing and grinding cobalt salt, urea, and melamine, followed by a first high-temperature calcination; sealing the product with tin foil and punching holes, followed by a second high-temperature calcination; and finally washing and drying to obtain the final product. This catalyst has an ultrathin two-dimensional sheet-like porous structure with a large specific surface area. It can activate potassium persulfate under visible light irradiation, efficiently degrading organic pollutants in wastewater through photo-Fenton-like synergistic catalysis. It exhibits high activity within the pH range of 3 to 7, demonstrates good catalyst stability and low metal leaching rate, and is suitable for treating wastewater containing various organic pollutants.

This invention discloses a method for preparing a peak-supported carbon nanocatalyst by metal-directed carbonization, comprising: Step 1: preparing hierarchical organic microspheres; mixing at least one aldehyde compound with an aprotic solvent to obtain solution I, mixing at least one amino compound with a protic solvent to obtain solution II, and mixing solution I and solution II to perform a condensation reaction to obtain hierarchical organic microspheres; Step 2: loading metal ions; dispersing the hierarchical organic microspheres prepared in step 1 in a solution containing metal ions, and loading the metal ions onto the hierarchical organic microspheres to obtain a metal ion-organic microsphere composite; Step 3: carbonization; subjecting the metal ion-organic microsphere composite prepared in step 2 to carbonization treatment to obtain a peak-supported carbon nanocatalyst. The catalyst prepared by this invention has the characteristics of highly accessible active sites and structural stability, exhibiting excellent anti-poisoning performance and catalytic activity.

The invention belongs to the technical field of high radioactive waste treatment, and relates to a high-entropy ferrite rare earth based perovskite ceramic solidified body and a preparation method and application thereof.The general formula of the solidified body is A1 / n (FexBy) O3, n represents the number of element types of the A lattice site of the high-entropy A1 / n (FexBy) O3 ferrite rare earth based perovskite ceramic solidified body, n is an integer and is larger than or equal to 3 and smaller than or equal to 7, and the A element types include Bi, Sc, La, Ce, Pr, Nd, Pm, Sm, Eu, Gd, Tb, Dy, Y, Ho, Er, Tm, Yb and Lu; m is at least three of transition metal elements including Cr, Mn, Co, Ni, Al, Ti, Zr, Hf, Nb, Ta and Ce, x is equal to 0.01 to 1.00, and x is equal to 0 to 0.99. According to the method, a high-entropy strategy is introduced into the ferrite rare earth perovskite ceramic solidified body, the ceramic solidified body not only can solidify various key high-radionuclides, but also has excellent chemical stability, low leaching rate and low preparation temperature, and the disadvantage that ceramic solidified nuclides are high in selectivity and single is effectively avoided. Due to the excellent performance of the ceramic solidified body, the ceramic solidified body has great application potential in the field of solidification treatment of high-radioactivity nuclear waste of a spent fuel reprocessing plant.

This invention provides a method and application for the simultaneous stabilization of arsenic and cadmium. The method includes the following steps: S1, providing arsenic-cadmium solid waste containing arsenic and cadmium; S2, mixing the arsenic-cadmium solid waste and a composite reagent in an acidic solution to obtain a reaction solution; the composite reagent includes ferrous sulfate and ferrous sulfide, with a mass ratio of ferrous sulfate to ferrous sulfide of 0.5–3:1; S3, performing solid-liquid separation on the reaction solution to obtain a stabilized arsenic-cadmium residue. This invention can achieve simultaneous stabilization of arsenic and cadmium in solid waste, and the leaching toxicity of the stabilized residue sample meets relevant leaching toxicity standards.

The application discloses a kind of aluminum ash-based concrete and preparation method thereof, it is related to concrete technical field;The aluminum ash-based concrete of the application, raw material components include by weight fraction:182 mass parts cement, 100 mass parts mineral powder, 16~20 mass parts pretreated aluminum ash, 60 mass parts fly ash, 1050 mass parts coarse aggregate, 790 mass parts fine aggregate, 7~7.5 mass parts composite water reducing agent, 172.8 mass parts water;The raw material components of the composite water reducing agent include dimethyl phthalate-5-sodium sulfonate, zinc citrate, glycerol carbonate, alcohol chain extender, n-butyl titanate;The alcohol chain extender includes any one or more combinations of triethanolamine, 1,4-butanediol, neopentyl glycol, hexanediol, heptanediol.