521results about "Iron halides" patented technology

Processes for use of a controlled continuous high pressure multiple reactant streams flowing into a chemical mixer/reactor. Individual reactant streams are pressurized to about 8,000 to 50,000 psi and achieve velocities up to about 250 meters/second in the final stage of the chemical mixer/reactor.

The invention relates to a method for recycling copper, nickel, chromium, zinc and iron from plating sludge, belonging to the technical field of chemical engineering and metallurgy. The method comprises the following steps: acid leaching, vulcanizing for separation and enrichment, hot-pressure leaching, extracting for separation, hot-press oxidizing chromium, purifying chromium solution, extracting ferric chloride and the like. The method has obvious advantages of strong adaptability to different kinds of plating sludge, high utilization of metal resources, high value-added content of product,less process waste residue, thorough deintoxication and the like.

The invention relates to a method for extracting copper of a PCB acid etching waste liquid and preparing polyferric chloride, which comprises the following steps: the PCB acid etching waste liquid is electrolyzed directly and copper powder precipitated by electrolysis is reclaimed; reduced iron is added into a mixed solution after the electrolysis and copper sponge precipitated by replacement reaction is reclaimed; claimed crude copper is purified and prepared into copper powder products; the mixed solution after replacement reaction is added with ferric oxide or a substance containing Fe irons; the mixed solution mingled with the Fe irons is added respectively with a polymeric antioxidant and a stabilizer and simultaneously, the pH value of which is regulated with acid or alkali; and finally, the PFC is prepared. The method of the invention completely realizes reclamation and recycling of wastes and water environment treatment and finally 'zero' emission and has good environmental protection, simple preparation process, high economic benefit and wide application scope.

The invention discloses a new method for resource comprehensive utilization of red mud and fly ash, and relates to a comprehensive utilization of industrial waste, specifically to a preparation method for a flocculating agent of aluminum ferric chloride and white carbon black. The method comprises the following steps: (1) acid leaching: the red mud and the activated fly ash are adopted as raw materials, and react with HCl, wherein the leaching temperature is 70-90 DEG C, a solid-liquid ratio is 10:1-10:3, the HCl concentration is 3-6 mol.L<-1>, the leaching time is 4-10 hours; (2) polymerization: Na2CO3 is added to a dissolution solution 1 to carry out telomerization, a dissolution solution 2 is added to the dissolution solution 1 until the dissolution solution 1 is stable, then the polymerization reaction is performed to obtain the polyaluminum ferric chloride, wherein the temperature is 60-70 DEG C, the pH value is 2.5-3.0, the aging time is 12-24 hours; (3) white carbon black preparing: a NaOH solution is adopted to carry out alkali dissolution to dissolve the filter residue, then treatments of acidification and calcination are performed to obtain the powder SiO2, wherein the alkali dissolution temperature is 80-100 DEG C, the time is 4-8 hours.

The invention relates to a method for treating ferric trichloride etching waste liquor, in particular to a method for treating the ferric trichloride etching waste liquor containing nickel, which mainly adopts a two-stage extraction method to remove iron so as to achieve the complete separation of the nickel and the iron, wherein a first stage extraction organic phase combination comprises 15 to 40 percent of extractant, 10 to 20 percent of synergist and 40 to 75 percent of diluent agent according to the volume ratio; a second stage extraction organic phase combination comprises 20 to 50 percent of extractant, 5 to 10 percent of synergist and 40 to 75 percent of diluent agent according to the volume ratio; the extractants and the synergists used in the two stages have various selections; and under the condition that the technological parameters are controlled strictly, with the two stages of extractions, the iron contained in the etching waste liquor is regenerated into a liquid state ferric trichloride product, and the nickel is regenerated into a nickel chloride product. The method overcomes various defects of the prior art, has good iron and nickel separation effect, high efficiency and low cost, achieves the resource recycling of valuable metals to the utmost extent while achieving the decontamination of the ferric trichloride etching waste liquor, and has board technique application prospect.

The invention discloses a comprehensive recycling process for valuable metal roasting-cyaniding gold-containing tailing, belonging to comprehensive recycling and utilization of industrial solid waste. The process comprises the following steps: selecting hydrochloric acid, chlorine and sodium hypochlorite as a leaching agent to leach gold, silver, iron, lead and arsenic to the maximum extent; adsorbing gold and silver with activated carbon, removing and recycling arsenic and lead through a series of solid-liquid separation and conversion, evaporating and crystallizing a ferric chloride solution subjected to impurity removal, thus finally producing a ferric chloride hexahydrate product, and realizing the comprehensive recycling process for valuable metal in the tailing. For the process, the available raw material sources are wide, the processing cost is low, the step-by-step impurity removal is thorough, all the impurities are recycled, no secondary pollution is generated, and the comprehensive recycling process can be used for fully realizing clean production, is environment-friendly and convenient for industrial production and has good promotion and application values.

The invention discloses a process method for ultra-high purity alumina preparation by utilizing coal ash and comprehensive utilization of ultra-high purity alumina. In the process method, mechanical activation, flotation decarbonization, magnetic separation iron removal sulfuric acid aluminum lixiviation, solid-liquid separation, resin absorption iron removal, low-iron aluminum sulfate concentration, organic alcohol alcoholization acid washing, aluminum sulfate dehydration drying and aluminum sulfate high-temperature calcination are carried out on the coal ash so as to obtain ultra-high purity alpha-Al2O3, wherein the content of the Fe2O3 in the ultra-high purity alpha-Al2O3 is less than 2 ppm. By using the process method, the complicated purification problem that intermediate aluminum sulfate in the process of coal ash reclamation is necessarily subjected to a called Bayer circulation process is avoided, thereby simplifying the process flow, reducing the energy consumption, reducing the resource consumption and solving the technical problem of over-large secondary residue quantity accumulation. The process method has the advantages that the extraction efficiency is high, and the circulation recovery of organic alcohol and sulfuric acid and comprehensive utilization of byproducts such as resin and the like are achieved. In the invention, the process is simple, the process flow is short, the production process is easy to control, the content of the impurity in the product is low, and the quality of the product is stable.

The invention discloses a ferric fluoride nano material and a preparation method thereof. The preparation method comprises the following steps of: dissolving inorganic ferric salt in an alcohol solvent to obtain alcohol solution containing iron; dispersing an inorganic fluorine source into the alcohol solution containing iron and adding the solution into a hydrothermal reaction kettle; carrying out the hydrothermal reaction kettle solution for 1 hour to 7 days at a temperature of 40 to 140 DEG C, naturally cooling, carrying out centrifugal separation, washing by ethanol and carrying out vacuum drying to obtain the ferric fluoride nano material. According to the preparation method of ferric fluoride, a volatile hydrofluoric acid fluorine source does not need to be used as a raw material, low-toxicity fluoride is used as the fluorine source, common ferric salt is used as a ferric source, the FeF3.0.33H2O nano material containing trace moisture is obtained by the simple solvent heat treatment, the preparation process is simple, the yield is high and the obtained material has high crystallinity. The method disclosed by the invention is a novel and practical process route for preparing the ferric fluoride nano material and has high actual application value.

A first compound having an atom in an oxidized state is reacted with a bis(trimethylsilyl) six-membered ring system or related compound to form a second compound having the atom in a reduced state relative to the first compound. The atom in an oxidized state is selected from the group consisting of Groups 2-12 of the Periodic Table, the lanthanides, As, Sb, Bi, Te, Si, Ge, Sn, and Al.

The invention discloses a method for separating, purifying and recycling waste hydrochloric acid containing iron, belonging to the field of wastewater treatment. The method comprises the following steps: (A) filtrating with sands to remove suspended matter in iron casting waste hydrochloric acid flushing fluid, dropwise adding oxidant, ensuring the oxidized flushing fluid through a absorption tower filled with strongly alkaline anion exchange resin, adding industrial concentrated hydrochloric acid to increase the concentration of HCl in the treated effluent liquid and returning the obtained solution which is used as iron casting hydrochloric acid flushing fluid to recycle, to the production flow; (B) ensuring distilled water or deionized water used as regenerant through a resin bed to elute the exchanged iron complex genitive ions on the strongly alkaline anion exchange resin and forming high concentration ferric chloride water solution which can be used as purifying agent and is sentback to the production flow to use. In the invention, strongly alkaline anion exchange resin is used for the treatment and resource recovery of iron casting waste hydrochloric acid flushing fluid in the fields such as electroplating, iron and steel and the like so as to realize the complete recycling of hydrochloric acid; water is used as resin regenerant to regenerate resin and generate ferric chloride water solution simultaneously so that water can be used to prepare purifying agent.

The present invention provides a method for making modified jacobsite, Al-doped maghemite or modified maghemite nanoparticles that can be used to adsorb heavy metals, such as Cr(VI), found in wastewater. The magnetic nanoparticles can be separated using a magnetic field after adsorbing heavy metals from wastewater, and processed for reused.

This invention discloses a method for preparing a stable inorganic polymer flocculant, polyferric silicate chloride, from industrial acid-washing wastewater and iron scale by high-speed shearing, and its application in tap water purification. The method comprises: adding certain amounts of HCl and iron scale according to the contents of free acid and iron in industrial acid-washing wastewater, adding oxidant and stabilizer, oxidizing and polymerizing, adjusting the alkalinity with CaO (or MgO, or mixed slurry of Mg(OH)2 and Ca(OH)2) to obtain stable polyferric chloride, adding poly(silicic acid), and polymerizing under high speed shearing to obtain stable polyferric silicate chloride flocculant. The method has such advantages as simple process, mild reaction conditions and low investment, and is environmentally friendly. The prepared polyferric silicate chloride has better effect on tap water purification than polyferric chloride, ferric chloride and other iron-containing flocculant.

The invention relates to a preparation method of polyaluminum ferric chloride, belonging to the technical field of preparation of inorganic high-polymer coagulating agents. The method comprises the following steps: adding dilute hydrochloric acid into a 10-14% iron-containing spent acid solution until the concentration of the iron-containing spent acid solution is enhanced to 15-18%, thereby obtaining an iron-containing spent acid solution; adding the iron-containing spent acid solution into a reaction vessel in batches, adding aluminum ash to obtain a stock solution, and carrying out polymerization reaction on the stock solution while continuously stirring, thereby obtaining a polyaluminum ferric chloride initial product; and discharging the initial product out of the reaction vessel, introducing into a precipitation tank, adding a back blending solution into the precipitation tank, adding a precipitant and PAM (polyacrylamide) into the precipitation tank, stirring uniformly, standing to stratify, introducing the supernatant into a finished product tank to obtain the polyaluminum ferric chloride, introducing the precipitate in the precipitation tank into a pressure filter to perform pressure filtration, and using the pressure filtrate as the back blending solution. The method saves the resources, and is beneficial to environmental protection; the processing steps are short and easy to operate; and the method has ideal energy-saving effect.

The invention discloses a method for preparing a polyferric chloride flocculant by using steel wire rope sludge and waste salt. According to the method, the steel wire rope pickling sludge is dissolved in waste hydrochloric acid, lead ions in the dissolved solution are removed with a sulfide precipitation method, and the polyferric chloride flocculant is obtained; produced hydrogen sulfide gas meets the national odor pollutant emission standard after being subjected to falling-film absorption, packed tower absorption and activated carbon adsorption treatment, and meanwhile, whole-process sulfur element recycling is realized; cement is added to sludge residues for curing, and heavy metals are cured and stabilized. With the adoption of the method, the recovery rate of iron in the sludge is higher than 90%, the produced polyferric chloride flocculant has excellent performance in purification of domestic sewage, and produced lead sulfide meets the industrial purity requirement and can be used as an industrial raw material. With the adoption of the method, harmless disposal and resource utilization of the steel wire rope pickling sludge and the waste hydrochloric acid are realized simultaneously.

The invention discloses a combination production method for industrially producing a plurality of products by using high-iron alumyte as a material. The combination production method comprises the steps of performing pressure-leaching the high-iron alumyte by using hydrochloric acid as a leaching medium, iron enters the hydrochloric acid in the form of ion to form the chloride of iron, aluminum is left in solid alumyte, thereby separating iron from aluminum; roasting a hydrochloric acid leaching fluid to obtain iron oxide red and a chlorine hydride gas, wherein the chloride hydride gas is absorbed by washing water and becomes hydrochloric acid, which can be recycled; and melting the upper layer of products, conducting directional crystallization to prepare a cocrystallized Al-Si alloy with silica content below 14wt%. Therefore, the high-iron alumyte which cannot be utilized currently, can be comprehensively utilized.

The disclosed processes can be effective for treating various materials comprising several different metals. These materials can be leached with HCl for obtaining a leachate and a solid. Then, they can be separated from one another and a first metal can be isolated from the leachate. Then, a second metal can further be isolated from the leachate. The first and second metals can each be substantially selectively isolated from the leachate. This can be done by controlling the temperature of the leachate, adjusting pH, further reacting the leachate with HCl, etc. The metals that can be recovered in the form of metal chlorides can eventually be converted into the corresponding metal oxides, thereby allowing for recovering HCl. The various metals can be chosen from aluminum, iron, zinc, copper, gold, silver, molybdenum, cobalt, magnesium, lithium, manganese, nickel, palladium, platinum, thorium, phosphorus, uranium, titanium, rare earth element and rare metals.