4 results about "Ferric fluoride" patented technology

The application discloses a method for rapidly and harmlessly treating phosphogypsum, and particularly relates to the harmless treatment technical field of industrial solid waste. The method comprises the following steps: mixing raw materials with an alkaline neutralizing agent, a trapping agent and an activating agent, adding a phosphorus solidifying agent and a fluorine solidifying agent, mixing, carbonizing and aging, and obtaining harmless phosphogypsum. The method adopts the alkaline neutralizing agent to rapidly neutralize free acid and improve the pH of the system; the trapping agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form a difficult-to-dissolve iron oxide gel or a precipitate; the phosphorus solidifying agent and the fluorine solidifying agent perform deep chemical precipitation to form a stable iron-calcium-phosphate / ferric fluoride composite solidified body. The functions of the agents are clear, and the agents have synergistic effects; the solidification effect of the agents on high water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simply compounded agent system; and the leaching concentration can be reduced to a level far lower than the national standard.

This invention discloses a method for preparing high-purity terbium-iron alloy, utilizing ferric fluoride as a chemical decalcification agent in the refining stage. Compared with existing technologies that rely solely on high-temperature volatilization and physical adsorption for calcium removal, this method provides a clear chemical driving force, converting calcium dissolved in the alloy melt into an insoluble calcium fluoride slag phase through a displacement reaction, thereby achieving efficient calcium removal. This invention can reduce the calcium content in terbium-iron alloy from 0.011-0.015% in traditional processes to 0.002-0.004%, a reduction of 70-85%. This method requires no special equipment; only the addition of ferric fluoride in the refining stage is needed, resulting in low process modification costs and good industrial applicability.

Catalysts and processes for the production of 1,2-difluoroethene from 2-chloro-1,1-difluoroethane. The present application provides a supported catalyst comprising a first catalytic component selected from the group consisting of aluminum fluoride, chromium fluoride, cobalt fluoride, ferrous fluoride and ferric fluoride supported on a support, and a second catalyst component selected from the group consisting of potassium fluoride, cesium fluoride, magnesium fluoride and calcium fluoride. The present application also provides a process for the production of 1,2-difluoroethene by catalytic cracking of 2-chloro-1,1-difluoroethane using the catalyst. The technical solution of the present application can greatly improve the conversion rate of HCFC-142, which is an industrial byproduct of no value, and obtain high-value target product 1,2-difluoroethene with high selectivity.

The invention discloses a method for rapidly and harmlessly treating ardealite, and particularly relates to the technical field of harmless treatment of industrial solid wastes. The method comprises the following steps: mixing raw materials with an alkaline neutralizer, a capturing agent and an activating agent, adding a phosphorus fixing agent and a fluorine fixing agent, mixing, carbonating and aging to obtain the harmless phosphogypsum. The alkaline neutralizer is adopted to quickly neutralize free acid, so that the pH value of the system is increased; the capturing agent adsorbs heavy metals; the activating agent promotes As, Cd and the like to form insoluble iron oxide gel or precipitate; the phosphorus fixing agent and the fluorine fixing agent are subjected to deep chemical precipitation, and a stable iron-calcium-phosphate / fluoride composite solidified body is formed. All the agents are clear in function and have a synergistic effect, the curing effect on high-water-solubility phosphorus, fluorine and various heavy metals is far better than that of a single or simple compound agent system, and the leaching concentration can be reduced to be far lower than the national standard level.