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

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 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.

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.