3 results about "Cerium sulfate" patented technology

An electrochemically mediated, hydrometallurgical method is provided for extraction of nickel, zinc, lead, silver, molybdenum, and / or copper from sulfide minerals. These metal concentrates, such as pentlandite, pyrrhotite, pyrite, sphalerite, galena, Ag2S, MoS2, etc., are contacted with nitric acid and cerium(IV) nitrates, cerium(IV) methanesulfonate, and / or cerium(IV) sulfate, as oxidative leaching agents to preferentially leach the target metals contained therein. The strong oxidizing capacity of cerium(IV) enables rapid dissolution of metal sulfides under ambient conditions. Cerium(IV) can be electrochemically regenerated and recycled for treatment of additional sulfide minerals. Target metal products can be extracted via processes such as solvent extraction and precipitation, enabling complete recovery, e.g., of nickel from pentlandite.

This utility model discloses a continuous gradient addition device for extractant in a lanthanum-cerium separation process, comprising several tanks. Each tank has a feed pipe on its upper surface, a conduit connecting to adjacent tanks on its side surface, and a discharge pipe on the end of the tank's side surface. Centrifugal pumps are installed on both the discharge pipe and the conduit. A low-speed stirring device and a spraying device are also installed on the tanks. Multiple tanks are cascaded via conduits, and the flow rate between stages is dynamically controlled by the centrifugal pumps, causing the extractant concentration to decrease gradually, eliminating concentration jumps, and improving the lanthanum-cerium separation coefficient. The low-speed stirring device inside the tank improves extraction efficiency while preventing blockage of the tank bottom and pipes due to easy crystallization of cerium sulfate, reducing the frequency of downtime cleaning and improving work efficiency. The spraying device enables online cleaning after shutdown, improving residual liquid discharge rate and preventing cross-contamination between batches.

The present application relates to a kind of new magnetic composite coagulant, by the following preparation method is obtained, (1), the preparation of polymeric ferric phosphate sulfate:98% concentrated sulfuric acid is added dropwise to saturated hydrated ferric nitrate solution, then the prepared saturated Na2HPO4 solution and saturated NaHCO3 solution are added dropwise in turn, to obtain polymeric ferric phosphate sulfate;(2), the preparation of modified polymeric ferric phosphate sulfate: first silane coupling agent KH550 or KH570 is hydrolyzed 1 hour, then the hydrolyzed silane coupling agent KH550 is added dropwise into three-necked flask in step (1), to obtain modified polymeric ferric phosphate sulfate;(3), chitosan, Fe3O4 and modified polymeric ferric phosphate sulfate are dissolved in dilute acetic acid solution, slowly add cerium sulfate, react 2-6h to obtain new magnetic composite coagulant.Composite magnetic flocculant has the performance of realizing oil-water-floc separation quickly and efficiently.