34results about How to "Implement selective extraction" patented technology

The invention discloses a method for selectively extracting lithium from a waste lithium iron phosphate material, which comprises the following steps: immersing the waste lithium iron phosphate material in a sodium hydroxide solution, carrying out alkali leaching to remove aluminum, filtering, and removing aluminum from the filtered The material is dried to obtain lithium iron phosphate powder, and the filtered sodium aluminate filtrate is recovered; the lithium iron phosphate powder is put into a heating furnace, and the selective lithium extraction gas is introduced, and then roasted to obtain iron phosphate and lithium The compound of iron phosphate and lithium is added to the ball mill, wet ball milled, and filtered to obtain iron phosphate solid and lithium-containing solution respectively; the pH value of the lithium-containing solution is adjusted to 9.0‑11.0, and impurities are removed to obtain pure lithium solution; adding sodium carbonate solution to pure lithium solution for reaction, filtering, washing and drying the filtered solid to obtain lithium carbonate. The lithium in the waste lithium iron phosphate material is recovered by the method of the invention, and the recovery rate of the lithium is as high as 95 percent or more.

The invention discloses a method for selectively extracting lithium from lithium iron phosphate waste materials. The method comprises the following steps that water is added into the lithium iron phosphate waste material for slurry, then acid is added, and the temperature is heated to 40-100 DEG C, the pH value of the system is adjusted to 2-4, the temperature and the pH value range are kept, reacting is carried out for 1-10 hours, and filtering and separating are carried out on the reacted slurry so as to obtain a lithium solution and phosphorus iron slag; and the acid is one of concentratedhydrochloric acid, concentrated sulfuric acid or concentrated nitric acid. According to the method, the lithium in the waste lithium iron phosphate material is recycled, the lithium recovery rate is up to 98% or above, and the purity of the further prepared lithium carbonate reaches 99.0% or above; the method is simple in process, and low in energy consumption; and the selective extraction of thelithium in the waste lithium iron phosphate material is realized, the product value is high, considerable economic benefits are achieved, and the recovery and development of lithium iron phosphate waste batteries are facilitated.

The invention discloses a preparation method of naringin dihydrochlcone. The preparation method of the naringin dihydrochlcone comprises the following steps: drying and superfinely grinding a citrus peel and / or fructus aurantii immaturus; conducting subcritical water extraction on a citrus peel powder; purifying and eluting a naringin extracting solution; concentrating a naringin eluant at the reduced pressure, freeze-drying; conducting hydrogenation on the naringin; regulating the pH value of a hydrogenation solution, allowing standing still, filtering, and freeze-drying, thereby obtaining the naringin dihydrochlcone. The preparation method has the advantages of being simple in process, convenient to operate, low in cost, green, and high in yield and purity, the comprehensive utilizationvalue of the citrus and fructus aurantii immaturus is improved, and the preparation method has an excellent application prospect and an excellent economic benefit; in addition, no organic solvent is used in the preparation process, no secondary pollution is caused to the environment, and the preparation method is a promising environmentally friendly preparation method, is suitable for large-scalepreparation, and can be industrially used conveniently.

The invention belongs to the technical field of electrochemical lithium extraction, and specifically relates to an electrochemical lithium extraction method based on a "rocking chair" structure electrode system to realize high selectivity and low energy consumption extraction of dissolved rare lithium resources. The "self-driven" electrochemical lithium extraction method based on the "rocking chair" structure electrode system described in the present invention is based on the existing electrochemical lithium extraction method based on the "rocking chair" structure electrode system. The "drive" process is used in the electrochemical lithium extraction method, using the self-potential difference between electrodes in different states in the "rocking chair" structure electrode system to carry out self-driving (even energy recovery) process to extract lithium, so that the two electrodes first use the smaller potential difference between themselves Lithium extraction is carried out, and then further lithium is extracted by applying an external electric field, which effectively reduces the energy consumption of the lithium extraction process, and realizes the synchronous improvement of the electrode-to-lithium exchange capacity and selectivity coefficient, which has significant technical advantages.

An electrochlorination extraction method of gold in a gold-containing material, including anodic dissolution and cathodic deposition, which are completed in the same reactor. The gold-containing material is put into the electrochemical reactor containing the sodium chloride concentration of 0.1~3 mol / L electrolyte in the form of flakes, powders or granules, and the control reaction temperature is 25~99 ° C, and the current density is 0.01~3 A / cm 2 , the reaction time is 1-6 h; after the electrolysis is completed, the deposits in the cathode chamber and the cathode plate are collected, washed and dried to obtain gold powder. The invention has the remarkable advantages of high gold extraction efficiency, less chemical reagent consumption, clean process, simple operation, short flow and the like.

The invention discloses a high-efficient method of extracting uranyl ions from water and belongs to the field of the water treatment technology; the method comprises the steps: absorbing the uranyl ions from the surface of an absorbing material in advance; throwing the absorbing material absorbed with the uranyl ions in advance to waste water containing the uranyl ions, stirring, filtering and finally collecting filter residues. The high-efficient method of extracting the uranyl ions from water has the advantages of simple method, easy operation at normal temperature and no other impurities introduced; the method is green, environmental-friendly, economic and effective; the secondary pollution caused by toxic pollutants is avoided; high-salt and complex ion environments in water can be overcome effectively and the selective extraction of the uranyl ions in water is realized.

The invention relates to a method for extracting and separating a lithium isotope aqueous solution and belongs to the technical field of solvent extraction. In the method, hydrophobic naphthisoazine and hydrophilic ionic liquid respectively serve as an extracting agent and a synergist; and naphthisoazine, the ionic liquid and lithium ions form a stable ion associated matter under an alkaline condition, lithium ions enter into an organic phase through aqueous phase extraction and an obvious isotope separation effect is generated. The method comprises the following steps of: regulating the alkalinity of a lithium hydroxide solution, respectively adding the extracting agent, the synergist and the hydrophilic ionic liquid serving as an extracting medium, oscillating at normal pressure and normal temperature, standing still for layering, collecting the organic phase, and adding sodium sulfate into the organic phase to carry out lithium salt back extraction so that the lithium ions come back to the aqueous phase, thereby realizing the selective extraction and high-efficiency enrichment of lithium isotopes.