61results about How to "High fluoride removal efficiency" patented technology

The invention provides a device for removing fluorine ions in groundwater, which comprises water inlet devices (1), a reaction device (2), ultra-filtration devices (3) and aeration devices (4), wherein the water inlet devices (1) are arranged on the reaction device (2) and are provided with material feed devices; the ultra-filtration devices (3) are arranged in the reaction device (2); the aeration devices (4) are arranged at the bottom of the reaction device (2) and aerate by aeration holes (16) on the aeration devices (4); the ultra-filtration devices (3) are provided with outlet pipes (5); and first water pumps (6) are arranged on the outlet pipes (5). The invention further provides a method for removing fluorine by the device for removing fluorine ions. The device for removing fluorine ions in groundwater has the characteristics of simple structure, convenient use, low cost, good fluorine removing effect, and high effluent quality.

The invention discloses a defluorination material, which comprises a metal organic framework material, wherein metal hydroxide is dispersed on the surface of the metal organic framework material and/or in holes; the metal hydroxide is at least one of Mg(OH)2, M(OH)3 and Zr(OH)4; and M is a trivalent metallic element. The invention further discloses the defluorination material which is obtained through activating the metal organic framework material at 180-260 DEG C, putting the metal organic framework material into a solution into which a water-soluble salt of magnesium, a water-soluble salt of M and a water-soluble salt of zirconium are dissolved, regulating the pH of a system to be 8.0-9.5 by using a fixing agent, carrying out stirring reaction, carrying out solid-liquid separation, washing and drying. In addition, the invention further discloses an application of the defluorination material in defluorination of a zinc sulfate solution. The preparation method of the defluorination material is simple, and the prepared material has large specific surface area and uniformly dispersed metal groups, has good compatibility on fluorin ions and has very high selectivity and high defluorination efficiency.

A treating method of fluorine-containing waste water is disclosed. The fluorine-containing waste water comprises F-, SO4<2-> and Al<3+>. The method includes: bringing the fluorine-containing waste water and a water-soluble aluminum-source fluorine removing agent into contact and adjusting the pH value of the fluorine-containing waste water to be not lower than 5 to perform neutralization and sedimentation reactions; bringing the fluorine-containing waste water after the neutralization and sedimentation reactions and discharged sludge from a coagulating sedimentation treating unit of waste water free of fluorine into contact; and subjecting the obtained mixture to sludge dehydration to obtain dehydrated sludge and filtrate. The method can perform effective fluorine removal treatment for the fluorine-containing waste water having high contents of the F-, the SO4<2-> and the Al<3+>.

The invention discloses a defluorination material for a zinc sulfate solution in the zinc smelting process and a preparing method. The defluorination material is mainly prepared from oxide containing aluminum elements, rare earth elements, iron elements and magnesium elements. The preparing method includes the steps that aluminum hydroxide powder is placed into iron-magnesium salt mixed liquid, the mixture is stirred, alkaline is added to adjust pH, and the obtained mixture stands and is subjected to suction filtration; the obtained sample is added into a rare earth salt solution, the mixture is stirred again, alkaline is added to adjust pH, and the obtained mixture is subjected to suction filtration and dried; finally, the obtained product is placed into a high-temperature resistance furnace and roasted under the ventilation condition, and the defluorination material is obtained. The preparing method is simple, and the product is stable in nature, has high selective adsorbability and high adsorbing capacity for high-concentration fluorinion in the zinc sulfate solution and can be recycled with a simple method. When the material is applied to removing the high-concentration fluorinion in the zinc sulfate solution, the concentration of F in the solution can be effectively and rapidly reduced, the enterprise cost can be reduced, and environment pollution can be reduced. The material is suitable for large-scale industrial application.

The invention discloses a defluorination method of fluorine-containing hydrochloric acid. The method includes the following steps that 1, firstly, fluorine-containing hydrochloric acid is weighed andadded in a reaction device, silica gel is added into the reaction device so as to make the silica gel fully contact with fluorine-containing hydrochloric acid, the adsorption reaction occurs between hydrogen fluoride and silica gel in hydrochloric acid, and fluorinion is removed; 2, silica gel obtained after fluorine is adsorbed is subjected to water-bath shaking in a thermostatic oscillator for 1-2 h, the temperature of water bath is 20-30 DEG C, a regenerant is used for washing, the silica gel is treated to be neutral, after being adsorbed and dried by filter paper, the silica gel is placedin the reaction device, fluorine is separated out from the silica gel, the silica gel can be regenerated, and the silica gel obtained after regeneration is used for fluorine removal from hydrochloricacid in the next cycle. The method is simple in process, low in cost, convenient and safe to operate, high in fluoride removal efficiency, and suitable for defluoridation of low-fluorine hydrochloricacid.

The invention discloses a preparation method of an industrial water fluorine removal agent, and belongs to the technical field of industrial water fluoride removal. The industrial water fluorine removal agent is prepared from the following synthetic raw materials: acrylic acid, de-ionized water, acrylamide, urea, sodium carbonate, ferrous hydroxide, aluminum hydroxide, 10%-30% sodium hydroxide, active carbon, 10% ethylenediamine, nitrilo, ammonium persulfate, sodium hydrogen sulfite and calcium chloride. The preparation method comprises the following steps: preparing the synthetic raw materials, polymerizing and mixing to prepare the industrial water fluorine removal agent. The preparation method has the advantages that the prepared fluorine removal agent is high and stable in fluorine removal efficiency, and has a good fluorine removal effect on low-fluorine water with fluoride content of 20-50mg/L; a medicament preparation process is simple.

The invention discloses a method used for carrying out innocent treatment on hazardous waste electrolytic aluminum ash. The method is characterized by mainly comprising the following steps that firstly, raw material electrolytic aluminum ash is subjected to first-time breaking and screening; secondly, particle aluminum is subjected to melting and ingot casting; thirdly, the particle aluminum is subjected to secondary breaking and screening; and fourthly, the collected fine aluminum ash is subjected to dry method fluorine removal aluminum ash harmless treatment. The treatment method is large intreatment amount, high in fluorine removal efficiency (generally larger than 99%), free of draining fluorine containing waste water, free of secondary pollution and equipment and equipment corrosionand the like, and capital construction cost and running cost are both low.

The invention discloses a utilization method of phosphate ores. The utilization method comprises the following steps: crushing and finely grinding the phosphate ores to obtain phosphate ore powder; stirring the phosphate ore powder and hydrochloric acid to react at a room temperature for 0.5 hour to 6 hours; carrying out solid-liquid separation; carrying out fluorine removal, impurity removal, calcium-phosphorus separation (sedimentation, filtering, extracting, drying and the like) on a liquid solution; furthermore, treating a residual calcium chloride solution; finally, obtaining products including fertilizer-grade calcium hydrogen phosphate, feed-grade calcium hydrogen phosphate, phosphorus-nitrogen composite flame retardant, tricalcium phosphate, calcium sulfate whiskers and the like, and also obtaining a diluted hydrochloric acid solution; rectifying and concentrating the diluted hydrochloric acid solution and returning the solution back to a phosphate ore powder acidolysis procedure. According to the utilization method, the used hydrochloric acid can be circularly utilized, and the hydrochloric acid can be generated; the obtained hydrochloric acid is used for decomposing the phosphate ores again and the acidolysis cost is low; meanwhile, the phosphorus chemical products including the fertilizer-grade calcium hydrogen phosphate, the feed-grade calcium hydrogen phosphate, the phosphorus-nitrogen composite flame retardant, the tricalcium phosphate, the calcium sulfate whiskers and the like can also be obtained, so that the comprehensive utilization efficiency of the phosphate ores is high and the economic benefits are good.

The invention discloses a method for defluoridation in acid preparation by brasses, which comprises the following steps: (1) adding Na2SO3 as a fluorine fixing agent in solution; (2) performing the proportion of adding quantity of sodium silicate and fluorine content in the solution according to 1.1 kg/kgF of the sodium silicate; (3) obtaining the required quantity of the sodium silicate by calculation, preparing 5 percent aqueous solution with the sodium silicate, adding the sodium silicate solution into a cooling recycle acid, wherein the adding point of the sodium silicate solution is positioned in the last grade of a washing device, the temperature is 20 DEG C, the cooling recycle acid containing 5 percent sodium silicate solution is sprayed from a cooling tower, the gas goes from bottom to top, and the cooling tower is required to be over 6m. The method has simple operation without adding other devices, high defluoridation efficiency, can reduce fluorin of an HF form in dilute acid to be less than 0.1 g/L executed according to the steps, thereby making the residue quantity of the fluorin in the gas reduced to the standard requirement which is less than 2 mg/Nm and ensuring the safety operation of a post system.

The invention belongs to the technical field of hydrometallurgy and resource recovery, and particularly relates to a fluorine removal method for a fluorine-containing material. The fluorine removal method comprises the following steps that 1), fluorine-containing solid powder containing one or two or more elements of cobalt, nickel and manganese is taken and leached with sulfuric acid to obtain fluorine-containing leachate; 2) a lime milk solution is added into the fluorine-containing leachate for carrying out neutralization reaction; 3) after the reaction is finished, filtering is carried outto obtain neutralized slag and a neutralized solution; (4) a fluorine removal agent is added into the neutralized solution for reaction; 5) after the reaction is finished, filtering is carried out toobtain a fluorine-removed solution and an acted fluorine-removed agent; and 6) regeneration treatment is carried out on the acted fluorine-removed agent by using a NaOH solution to obtain a regenerated fluorine removal agent. The method is simple and convenient in operation and high in fluorine removal efficiency, can reduce the fluorine content in the solution to be less than 10 mg/L, and is suitable for fluorine removal of a single cation solution system or a polycation solution system.

The invention discloses a deep defluorination system and method for electroplating wastewater. The system comprises a biochemical treatment unit and a deep defluorination unit which are connected in sequence. The method comprises the following steps: S1, performing biochemical treatment on the electroplating wastewater; S2, performing deep defluorination treatment on the electroplating wastewater subjected to the biochemical treatment in S1, wherein the electroplating wastewater subjected to the deep defluorination treatment can meet the standard and then be discharged. According to the deep defluorination system and the deep defluorination method for the electroplating wastewater, procedures of dephosphorizing the electroplating wastewater by using a biochemical active sludge method and then performing adsorption precipitation are added, so that fluorinions are preliminarily removed; furthermore, through the adoption of a deep defluorination treatment process, preliminary precipitation treatment is carried out firstly by using a polyacrylamide aqueous solution, then chemical precipitation is carried out by jointly using calcium salt and aluminum salt, and finally secondary precipitation treatment is carried out by using the polyacrylamide aqueous solution, so that the fluoride content is effectively reduced, the discharge of fluoride in the electroplating wastewater is avoided, the electroplating wastewater treatment efficiency and the social and economical benefits are improved, clean production, energy conservation and emission reduction are achieved, and pollution to the environment is reduced.

A preparation method of a fluorine removal adsorbent modified by a biopolymer composite material comprises the following steps: respectively dissolving chitosan and pectin in deionized water or acid, mixing and heating the two solutions, and carrying out a biopolymer cross-linking reaction; adding a molecular sieve soaked in deionized water into the mixed solution, performing reduced pressure distillation, adding chloroacetic acid and a sodium hydroxide aqueous solution, and grafting the chloroacetic acid to modify the chitosan-pectin biopolymer composite material; adding metal nitrate dissolved in a mixed solution of ethanol and water into the modified molecular sieve, performing reduced pressure distillation, adding a sodium hydroxide solution, stirring at room temperature, and doping metal ions into crystal lattices of the modified polymer; and filtering redundant mixed solution, washing to be neutral with de-daubing water, and drying in a drying oven to obtain the modified defluorination adsorbent. The method is simple in preparation process, low in cost, easy to recycle and high in defluorination efficiency in wastewater.

The invention discloses a method of treating dust collecting ash of hazardous waste harmlessly. The method is characterized by primarily comprising the following steps of (1) carrying out first time crushing and screening on a raw material collecting dust; (2) melting and casting granular aluminum; (3) carrying out second time crushing and screening on granular aluminum; and (4) carrying out harmless treatment on aluminum ash by dry process defluorination on collected fine aluminum ash. The method is large in treatment capacity, high in defluorination efficiency (usually greater than 99%) andfree of secondary pollution and equipment corrosion, and fluorine-containing wastewater is not discharged and the like, and the capital expenditure and the operating cost are relatively low. The dustcollecting aluminum ash is crushed and screened, a rotary furnace recovers metal aluminum, and then the aluminum ash is then mixed with raw materials such as sand, cement, coal ash, a marble crushed material, granite and the like and auxiliary agents after aluminum removal and denitrification harmless treatment of thermal treatment by the high temperature rotary furnace, and is processed to concrete pavement bricks, so that the dust collecting ash is utilized effectively.

The invention discloses a method for improving the reverse osmosis defluorination efficiency, which comprises the following steps of: adding triethanolamine into raw water needing defluorination; and performing reverse osmosis membrane treatment through a reverse osmosis membrane to remove fluorine ions. The removal rate of fluorine ions can exceed 99%.

The invention discloses a load type fluorine removal agent which comprises yellow sand and an inorganic fluorine removal agent depositing on the surface of yellow sand. The mass ratio of the inorganic fluorine removal agent to the yellow sand is 4: 1 to 1: 1. The load type fluorine removal agent disclosed by the invention is suitable for an industrial fixed bed. By taking the yellow sand as a loading carrier, the load type fluorine removal agent is stable in performance, large in adsorption and high in fluorine removal efficiency. The fluorine removal agent disclosed by the invention can be regenerated in situ and can be repeatedly used, and still has a good adsorption effect after regeneration for many times. The load type fluorine removal agent disclosed by the invention is wide in source of raw materials which are easily available, and is low in cost. The preparation equipment and processing course of the load type fluorine removal agent are simple, the reaction condition is wild and the load type fluorine removal agent is suitable for industrial batch production.

The invention provides a magnesium oxide composite material for fluorine removal of a water body and a preparation method and application thereof. The fluorine removal material is characterized in that inert particles are used as a carrier, and the magnesium oxide is coated to the surface of the carrier by an adhesive and is cured, so as to form the magnesium oxide composite material. The magnesium oxide composite material is prepared from the following components of 30 to 50 parts of magnesium oxide, 0.1 to 20 parts of adhesive and 40 to 60 parts of carrier particles. The magnesium oxide composite material has the characteristics that the adsorption and fluorine removal activity of the magnesium oxide is reserved, the magnesium oxide is effectively cured, and the loss in the use process is greatly reduced; the sources of the raw materials are rich, the price is low, and the preparation is simple; the fluorine removal efficiency is higher, and the fluorine removal requirement of drinking water can be met.

The invention relates to a functionalized silicon dioxide modified defluorination material and preparation and an application thereof, and a preparation method of the functionalized silicon dioxide modified defluorination material comprises the following steps: reacting acidified mesoporous silicon dioxide nanoparticles with chitosan oligosaccharide in an acidic aqueous solution, and after the reaction is completed, obtaining chitosan oligosaccharide modified mesoporous silica nanoparticles; reacting chitosan oligosaccharide modified mesoporous silica nanoparticles with dicarboxylic acid in an acidic aqueous solution, then reacting with a metal compound, and treating in an alkaline solution after the reaction is completed so that metal hydroxides are generated on the surfaces of the mesoporous silica nanoparticles, and obtaining the functionalized silica modified defluorination material. According to the functionalized silicon dioxide modified fluorine removal material, dicarboxylic acid connected with chitosan oligosaccharide is used for chelating metal ions, the bonding stability of the metal ions is improved, and the modified material can remove fluorine ions through the dual effects of ion exchange and electrostatic adsorption.

The invention relates to a synthesis method of an adsorbent for removing fluorine in high salt, and belongs to the technical field of separation of fluorine-containing wastewater. The synthesis method of the adsorbent comprises the following steps: (1) swelling chloromethylated resin in an organic solvent, respectively adding an alkali and a quinoline amide derivative, stirring and reacting to obtain a mixture containing resin, and carrying out solid-liquid separation to take a solid phase which is modified chloromethylated bead resin 1; (2) adding a quinoline derivative and the organic solvent into the modified chloromethylated bead resin 1 in the step (1), stirring and mixing, and carrying out heating reflux reaction to obtain chloromethylated bead modified resin 2; and (3) adding a nitrate solution into the chloromethylated bead modified resin 2 obtained in the step (2), and reacting to obtain the defluorination adsorbent after the reaction is finished. The prepared modified defluorination material is simple in preparation process, low in cost, easy to recycle and high in defluorination efficiency in wastewater.

The invention discloses a medicament for removing fluoride in sewage, a preparation method of the medicament and a sewage treatment method, and belongs to the technical field of sewage treatment. Themedicament is prepared from the following components in percentage by mass: 25-35% of glucose, 4-6% of a flocculant, 1-2% of inorganic acid, 8-10% of metal carbonate, and 47-62% of water. The medicament is liquid, operation is convenient, the mud generation amount is less, and the cost is low. The fluoride removal efficiency is high, after treatment, the fluorine content can be decreased to 1.5 mg/L or below, the obvious effect is achieved in a plurality of local sewage treatment plants, and the medicament is suitable for the various types of sewage treatment plants.

The invention relates to pyrite-to-sulfuric acid flue gas defluorination equipment, which comprises a reaction furnace, an efficient washing tower and a middle washing tower, wherein the efficient washing tower comprises a first defluorination material inlet, and the middle washing tower comprises a second defluorination material inlet formed in the side wall. According to the invention, a two-stage washing tower with defluorination gradient is arranged to treat so as to improve the defluorination efficiency, and different defluorination materials can be added to achieve efficient defluorination treatment; the equipment is small in occupied area and high in defluorination efficiency, and is suitable for transformation and upgrading of old factories; the process method of the pyrite-to-sulfuric acid flue gas defluorination equipment comprises the following steps: S1, introducing furnace gas into the efficient washing tower; S2, adding a first defluorination material into the efficient washing tower; S3, adding a second defluorination material into the middle washing tower; and S4, discharging the treated furnace gas; and the process method has the advantages of high defluorination efficiency and convenience in raw material obtaining of pyrite-to-sulfuric acid preparation plants, and is suitable for transformation and upgrading of old plants.