10results about How to "Low dissolution rate" patented technology

The fluorine content of the fluorine-doped ion sieve precursor is 0.2%-2%, and the particle size of the fluorine-doped ion sieve precursor is 80-150 nm. The invention also discloses a preparation method of the fluorine-doped ion sieve precursor. The preparation method comprises the following steps: preparing a manganese and lithium metal salt solution A, and preparing a citric acid solution B and a fluorine-containing salt solution D; mixing the solution A and the solution B, heating and stirring to obtain a colloidal solution C; performing vacuum drying on the solution C to obtain a solid intermediate; grinding the solid intermediate, and calcining in a muffle furnace to obtain an ion sieve precursor marked as LMO powder; weighing LMO powder, putting the LMO powder into a reaction kettle, and adding the fluorine-containing salt solution D and deionized water; placing the reaction kettle in a muffle furnace for heat treatment to obtain precursor slurry; and carrying out suction filtration, washing and drying on the precursor slurry to obtain the fluorine-doped ion sieve precursor. According to the invention, the ion sieve precursor is doped with fluorine, so that the electron transmission path of disproportionation reaction is changed, and the problem of manganese solution loss of LiMn2O4 in the process of adsorbing and extracting lithium is solved.

The application provides a method for strengthening leaching of monazite optimal-soluble residue and relates to the technical field of hydrometallurgy. The method uses two-stage leaching to strengthen leaching: in a first-stage pre-leaching procedure, the optimal-soluble residue is pre-leached by using residual acid of leaching solution generated in a second-stage strengthening leaching, so as to increase the valuable metal content of the leaching solution and reduce the residual acid concentration, thereby reducing the dissolution rate of other impurity elements and improving the filtration performance of the ore slurry; the utilization rate of the residual acid is improved, and the overall acid consumption is reduced; the first-stage pre-leaching does not need heating, and the reaction heat is used to naturally heat the ore slurry, so that the energy consumption is effectively reduced; the reaction condition is relatively mild, and the requirement for the equipment and the operating environment is low; aging or standing is not needed, the operation is continuous, and the process is smooth; in the second-stage strengthening leaching procedure, the first-stage pre-leaching residue is strengthened and leached by using high acid, so that the valuable metal leaching rate is effectively improved; after part of the elements are recovered from the optimal-soluble residue by pre-leaching, the dissolved matter is relatively reduced under the condition of high acid, the ore slurry concentration and viscosity are reduced, and the solid-liquid separation effect is good.

The application discloses a plant biomass cellulose-based boron adsorbent, which comprises a substrate and a ligand grafted on the substrate, the substrate is cellulose grafted glycidyl methacrylate synthesized based on plant biomass cellulose, and the ligand is selected from any one of N-methyl-D-glucose, tris(hydroxymethyl) aminomethane, glycidyl-functionalized ethylenediamine and aldehyde glucose. A preparation method comprises the following steps: obtaining plant biomass cellulose based on plant biomass material; using plant biomass cellulose and glycidyl methacrylate monomers as raw materials, synthesizing cellulose grafted glycidyl methacrylate by adopting an ATRP method; and grafting polyol ligands onto the cellulose grafted glycidyl methacrylate by a hydrothermal reaction, to obtain the plant biomass cellulose-based boron adsorbent. The synthesis method of the boron adsorbent is green and simple, the cost is low, the adsorption capacity is large, and the method is favorable for large-scale application.

This invention belongs to the field of materials technology, specifically relating to a high-adsorption-capacity lithium extraction adsorbent from salt lakes and its preparation method. The method involves first preparing a packing support, then dissolving AlCl3 and NaAlO2 in a mixed solution of boric acid and sodium hexametaphosphate, respectively. The packing support is added to the AlCl3-containing mixed solution, allowed to stand, and then a mixed solution containing NaAlO2 and a LiCl solution are added. Ammonia solution is then slowly added, controlling the pH at 4-5 and the temperature at 50-60℃. After centrifugation, the precipitate is dried. After elution for 5-8 hours, a high-adsorption-capacity lithium extraction adsorbent from salt lakes is obtained. In this invention, the adsorbent is LiAl-LDHs, a type of adsorbent composed of monovalent Li... + and trivalent Al 3+ The unique layered material composed of Li + By selectively entering the solid phase to form LiAl-LDHs, the adsorbent of this invention exhibits excellent performance in the field of lithium extraction from salt lakes.

The invention relates to the technical field of wastewater treatment, in particular to a CuMn2O4 / gamma-Al2O3 catalyst as well as a preparation method and application thereof. The CuMn2O4 / gamma-Al2O3 catalyst is composed of a carrier gamma-Al2O3 pellet and an active component CuMn2O4, and the carrier gamma-Al2O3 pellet is The CuMn2O4 / gamma-Al2O3 catalyst disclosed by the invention is applied to an ozone-hydrogen peroxide synergistic catalytic oxidation system for treating organic wastewater, and the activation capability of the surface to ozone and hydrogen peroxide is optimized by utilizing oxygen vacancies between Cu and Mn sites and cation migration characteristics, so that the degradation efficiency of organic matters is improved. The system not only solves the problems of low heterogeneous catalytic oxidation efficiency and poor catalyst stability in the prior art, but also remarkably improves the COD removal efficiency, keeps good cycle stability, and realizes efficient degradation of high-concentration organic pesticide wastewater and reutilization of the catalyst.

This invention relates to the field of wastewater treatment technology, specifically to an ozone catalyst, its preparation method, and its application. The ozone catalyst uses a composite material of boron-doped activated carbon and nitrogen-doped carbon dots as a matrix, and is loaded with manganese, cerium, and copper. The nitrogen-doped carbon dots effectively anchor metal ions, forming uniformly dispersed metal-nitrogen-doped carbon dot active sites, which not only prevents the aggregation of metal oxide nanoparticles but also maximizes the exposure of active sites. Simultaneously, combined with the stabilizing effect of CeO2, the metal active components are firmly anchored, reducing the metal dissolution rate. Furthermore, the hydrophobic-hydrophilic balance on the surface of the ozone catalyst support and the chemical inertness of the carbon material effectively reduce the irreversible adsorption of natural organic matter and anions in the water at the active sites, preventing catalyst deactivation and improving the catalyst's resistance to poisoning.

The present application relates to the technical field of metal wire surface treatment and industrial online monitoring, and relates to a green pretreatment process and an online monitoring system for a card wire with high lubrication and rust resistance. The present application removes the oxide layer by using a composite organic acid and ultrasonic waves at 80-85 DEG C after the card wire is mechanically stripped by multi-stage reverse bending. A multi-parameter online monitoring system is established. During the pickling process, Fe 2+ , pH, conductivity and linear velocity are monitored online in real time, and the pickling parameters are adjusted adaptively to overcome the fluctuation of manual experience. Then, the card wire is neutralized, rinsed, sprayed with modified boron liquid to form a lubricating and rust-proof film, dried and wound to complete the pretreatment. The present application effectively solves the problems of large acid mist pollution, easy damage to the substrate, poor process consistency and insufficient rust-proof ability between processes in the traditional strong acid pickling. The surface friction coefficient of the pretreated card wire is less than or equal to 0.075, and the red rust time is greater than 72 hours, which provides high-quality raw material guarantee for subsequent high-precision drawing processing.

This invention discloses a method for activating persulfate to degrade organic pollutants using an iron / smarium co-modified porous nitrogen-doped carbon Fenton catalyst. The method uses the iron / smarium co-modified porous nitrogen-doped carbon Fenton catalyst as an activator to activate persulfate and degrade organic pollutants. The iron / smarium co-modified porous nitrogen-doped carbon Fenton catalyst comprises a porous nitrogen-doped carbon framework, with iron and samarium elements modified internally and on its surface. Iron and samarium elements coexist in the form of single-atom sites, diatomic sites, atomic clusters, and nanoparticles. The iron / smarium co-modified porous nitrogen-doped carbon Fenton catalyst used in this invention has the characteristics of high reactivity, wide applicability, and strong anti-interference ability. It is a catalyst with excellent Fenton-like catalytic performance and can be widely used to treat organic pollutants in water bodies. It can quickly and thoroughly remove organic pollutants, has high application value, and good application prospects.

The application discloses a kind of high-dispersion cobalt-based catalyst and its preparation method and application, belong to cobalt-based catalyst technical field, the present application with four carboxyl phthalocyanine cobalt and nitrogen defect carbon nanotube as raw material, through molecular self-assembly in organic solvent and form pre-assembly complex, then the pre-assembly complex is programmed microwave heating, obtain the high-dispersion cobalt-based catalyst, the present application utilizes the means that specificity molecular precursor and carrier defect engineering are combined, by liquid phase pre-assembly constructs "molecular anchor-anchor position" pre-connection system, again with the principle of programmed microwave energy precise input, successfully solve the key technical problems that existing microwave method preparation cobalt-based catalyst when metal atom is easy to gather, active site structure is uncontrollable and catalytic performance is mediocre etc..

This invention discloses a sintering control process for improving the lead and cadmium leaching rate of ceramic glazes, relating to the field of daily-use ceramic manufacturing technology. The process includes: determining the characteristic dielectric frequency of the glaze to be fired at its critical melting temperature, where the characteristic dielectric frequency corresponds to the frequency of synergistic polarization between lead or cadmium ions and glass network forging ions; heating the product to the critical melting temperature and holding it at that temperature, applying an intermittent pulsed electric field with a frequency equal to the characteristic dielectric frequency; after stopping the electric field, subjecting the glaze melt to temperature cycling treatment, applying periodic temperature fluctuations at a reference temperature; and after the last half-cycle of cooling, rapidly cooling through the glass transition temperature zone, followed by slow cooling to room temperature. This invention, through the synergistic control of characteristic frequency electric field writing, temperature cycling screening, and gradient rapid freezing, significantly reduces the lead and cadmium leaching rate of the glaze surface without changing the glaze formulation, increasing the maximum firing temperature, or extending the production cycle.