194 results about "Aluminium chlorohydrate" patented technology

The present invention belongs to the field of resource utilization of building materials and solid waste, and relates to a red-mud-based cementing material based on efficient drying, component homogenization and activity improvement, and a preparation method therefor. The preparation method comprises: adding a filter aid to red mud to carry out sedimentation, then subjecting same to filter pressing until the water content is 14-16%, then drying the solid material, which has been subjected to filter pressing, until the water content is 4% or below, and finally grinding same to obtain the product. The filter aid comprises the following raw materials: 10-30 parts of polyaluminum chloride, 5-15 parts of polyaluminum sulfate, 1000-1200 parts of blast furnace slag or fly ash, 700-900 parts of steel slag, 400-600 parts of carbide slag or alkaline residues, and 300-400 parts of desulfurized gypsum or phosphogypsum or fluorgypsum. By means of the present invention, the dehydration efficiency of red mud can be improved, the red-mud-based cementing material can also be prepared in one step; the preparation process for the red-mud-based cementing material is simplified; and the prepared red-mud-based cementing material has the advantages of a high mechanical strength, high durability and erosion resistance.

The invention provides an intelligent chemical adding control method and system, equipment and a storage medium, and belongs to the technical field of intelligent control, the method is applied to a water treatment system, and the method comprises the following steps: based on raw water data, obtaining a first chemical adding amount through a chemical adding amount prediction model; generating an initial dosing amount instruction based on the first dosing amount, and sending the initial dosing amount instruction to a polyaluminum chloride dosing device and a sodium hypochlorite dosing device; obtaining the raw water ion concentration, alumen ustum form data and a floating current value after chemical adding, calculating a first difference value between the raw water ion concentration and a target ion concentration, calculating a second difference value between the alumen ustum form data and target alumen ustum form data, and calculating a third difference value between the floating current value and a target floating current value; and determining a target correction coefficient based on the first difference value, the second difference value and the third difference value, and updating the first dosage based on the target correction coefficient to obtain a second dosage. According to the invention, the dosing precision and adaptability can be improved.

The invention discloses a production process of an efficient polyaluminum chloride-based composite flocculant, which includes adding tourmaline into ethanol for low-temperature ball milling treatment to obtain tourmaline fine powder; performing low-temperature grinding treatment on vermiculite, then successively adding tourmaline, aluminum isopropoxide and trichloromethylsilane and stirring, and obtaining a prefabricated vermiculite carrier after dispersion and granulation; standing the prefabricated vermiculite carrier for 1-2 h, then standing at a constant temperature for 3-5 h, then soaking it in an alkali solution for 20-30 min, performing ultrasonic treatment for 5-10 min, filtering and sintering to obtain porous mixed vermiculite; mixing dimethyldiallylammonium chloride and polyaluminum chloride evenly, then putting them into the porous mixed vermiculite and stirring evenly, then performing microwave oscillation treatment for 1-2 h, taking out the porous mixed vermiculite particles, which are the prefabricated flocculant; standing the prefabricated flocculant for 1-2 h, and obtaining an efficient flocculant after freeze-drying. The invention utilizes vermiculite to improve the sedimentation characteristics of the flocculant, combines with the negative ion adsorption of tourmaline, aggregates the flocs of dimethyldiallylammonium chloride and polyaluminum chloride, reduces the dispersion problem of the flocs, and achieves the balance of adsorption, sedimentation and flocculation.

The invention relates to the technical field of sewage treatment, and discloses an energy-saving and environment-friendly treatment method for sewage generated by a spinning electrostatic deoiling device. The method comprises the following steps: performing oil separation pretreatment on the oily agent wastewater, and treating in a pH adjusting tank in two stages: in the first stage, adjusting the pH value to 9-10, and adding polyaluminum chloride while quickly stirring; and in the second stage, the pH is further adjusted to 11-12, polyacrylamide is added with slow stirring, and finally, standing, precipitation and separation are performed. According to the method, the pollutant removal efficiency is remarkably improved and the COD (Chemical Oxygen Demand) removal rate is high by accurately regulating and controlling the pH value, adding the flocculating agent in batches and controlling the stirring speed. Meanwhile, compared with a traditional process, consumption of a large amount of acid and alkali is avoided, generation of hazardous waste such as sludge is reduced, the dosage of a flocculating agent and the treatment cost are reduced, and the efficient, economical and environment-friendly sewage treatment target is achieved.

The invention discloses a method for preparing a water purifying agent polyaluminum chloride by recycling secondary aluminum ash, which comprises the following steps: S1, mixing the secondary aluminum ash with a composite additive solution, stirring and reacting at 70-90 DEG C, then carrying out solid-liquid separation, and drying the solid; s2, the obtained pretreated aluminum ash and calcium carbonate are mixed, pre-roasted at the temperature of 900-1000 DEG C and then fused at the temperature of 1300-1400 DEG C, and cooling is conducted; and S3, firstly adding the obtained roasted material into 20-25wt% of hydrochloric acid, heating the obtained slurry to 80-105 DEG C, stirring and leaching, then adding water into the acid leaching solution to dilute until the final concentration of the hydrochloric acid is 5-10wt%, then heating to 80-105 DEG C, continuing stirring and leaching, cooling and filtering, and concentrating and crystallizing the filtrate to obtain the polyaluminum chloride. According to the method, the quality of the polyaluminum chloride is greatly improved through the methods of oxidation enhanced water washing, two-stage dynamic roasting, gradient acid leaching, by-product recovery and the like.

The invention relates to the field of sewage treatment, and discloses a sewage treatment method based on desulfurization and denitrification, which comprises the following steps: S1, magnetic flocculation-electro-catalysis pretreatment: adding a polyaluminum chloride-magnetic powder composite flocculant into sewage through a magnetic flocculation reactor to form a magnetic floc, removing suspended matters through a permanent magnetic separation device, and then entering an electro-catalysis oxidation pond, carrying out electrolysis by taking titanium-based lead dioxide as an anode and active carbon fiber as a cathode; and S2, performing synchronous desulfurization and denitrification on the three-dimensional electrode fluidized bed, feeding pretreated effluent into a three-dimensional electrode fluidized bed reactor, filling activated carbon particles as a third electrode, and adding a composite flora of thiobacillus and denitrifying bacteria. The efficient removal of sulfides, total nitrogen, total phosphorus and chemical oxygen demand in the sewage is realized through a multi-stage synergistic process of magnetic flocculation-electrocatalysis pretreatment, synchronous desulfurization and denitrification of a three-dimensional electrode fluidized bed, deep denitrification and dephosphorization of a denitrification filter tank and catalytic ozonation-membrane separation combined deep treatment.

The invention provides an electronic industrial wastewater deep defluorination composite coagulant based on pH self-adaption and a stage treatment method, and belongs to the technical field of industrial wastewater deep treatment. The composite coagulant is formed by compounding aluminum sulfate and polyaluminum chloride according to the mass ratio of (1: 3)-(3: 1), self-adaptive pH regulation and control are achieved through a two-component synergistic hydrolysis equilibrium mechanism, an aluminum salt form complementation and synergism mechanism is combined, a dynamic proportion adjustment technology is supplemented, the component proportion can be flexibly adjusted according to water quality fluctuation, a first-stage / second-stage stage treatment process is matched, and the composite coagulant has the advantages of high water quality and high water quality. And deep removal of fluorine ions is realized in stages. The method breaks through the dependence of the traditional process on stable water quality, obviously reduces the acid-base consumption and sludge treatment cost, and has the obvious advantages of high efficiency, economy and easiness in popularization.

The invention provides a method for preparing a poly-aluminum and functional silicon material by activating coal gasification slag and waste hydrochloric acid through microwave synergistic mechanical force, and belongs to the technical field of industrial solid waste recycling. The method comprises the following steps that the coal gasification slag is sequentially subjected to microwave radiation treatment and ball milling, activated slag and waste hydrochloric acid are subjected to an acid leaching reaction, and aluminum-iron-containing leachate and silicon-rich slag are obtained; extracting the aluminum-iron-containing leaching solution to obtain an iron-rich organic phase and a purified aluminum chloride solution; performing thermal polymerization reaction on the purified aluminum chloride solution to obtain polyaluminum chloride; the method comprises the following steps: carrying out alkaline leaching reaction on silicon-rich slag and waste alkali liquor, adding a structure-directing agent into a sodium silicate solution, and sequentially carrying out aging, solution pH value adjustment and crystallization precipitation to obtain mesoporous silica. According to the method, the aluminum-silicon leaching rate is remarkably increased through microwave-mechanical force synergistic activation, synergistic and efficient treatment of the three kinds of waste including the coal gasification slag, the waste hydrochloric acid and the waste alkali liquid is achieved, the technological process is closed, the product additional value is high, and the environmental and economic benefits are remarkable.

The invention relates to the technical field of red tide disaster prevention and control, in particular to a method for improving red tide treatment efficiency of polyaluminum chloride modified clay. The specific method comprises the following steps: activating the polyaluminum chloride modified clay with acid, and then applying the activated polyaluminum chloride modified clay into a sea area to be treated, so that the red tide organisms in the sea area are removed. The method can synchronously improve the pH of the red tide water body and reduce aluminum compound residues, has high efficiency, low cost and ecological safety, and is suitable for large-scale application.

The invention relates to the technical field of chemical wastewater treatment, in particular to a heat treatment device and a treatment method for synthesizing polyaluminum chloride from aluminum trichloride wastewater. The heat treatment device for synthesizing the polyaluminum chloride from the aluminum trichloride wastewater comprises a main body, a reaction cavity is formed in the main body, and a feeding pipe and an exhaust pipe are arranged at the top of the reaction cavity; the four-shaft stirring mechanism is arranged at the top of the main body and comprises a stirring motor, a transmission assembly and four stirring paddle groups, the stirring motor is in driving connection with the stirring paddle groups through the transmission assembly, and the stirring motor enables the adjacent stirring paddle groups to rotate in opposite directions; the heating ring sleeve is arranged outside the main body; the rotary heat exchange mechanism extends upwards from the bottom of the main body, is positioned in the center of the reaction cavity, and is embedded in the middle of the four-shaft stirring mechanism. According to the heat treatment device provided by the invention, the controllable dynamic curing effect can be achieved in the process of synthesizing aluminum trichloride wastewater into polyaluminum chloride, and the treatment effect and efficiency are effectively improved.

The invention aims to provide a method for preparing a carbon-zeolite composite material and co-producing a flocculating agent from coal gasification slag, and belongs to the technical field of solid waste resource utilization. An acid leaching-alkaline hydrothermal-polymerization process is adopted, and the flocculating agent is prepared by controlling the acid leaching temperature and the acid leaching concentration; acid leaching residues with different silica-alumina ratios and acid leaching solutions with different aluminum-iron concentrations are prepared; preparing the acid leaching residues with different silica-alumina ratios into a carbon-zeolite composite material containing zeolite with different silica-alumina ratios and an alkaline leaching solution under an alkaline hydrothermal condition; the acid leaching solution and the alkali leaching solution are mixed according to a specific proportion, and the polyaluminum ferric chloride flocculant is prepared through the steps of polymerization, curing, drying and the like. According to the process, the coal gasification slag is utilized to prepare the carbon-zeolite composite material with different hierarchical pore structures and the high-performance polyaluminum ferric chloride flocculant, the product performance is excellent, no secondary waste is discharged in the production process, and an innovative technical path is provided for resource high-value utilization of the coal gasification slag.

The utility model discloses a preparation device of modified polyaluminum chloride, which comprises a material mixing tank, a feeding pipe and a slag discharging pipe are arranged on the material mixing tank, a liquid discharging pipe is arranged in the material mixing tank, a spiral blade is fixedly arranged on the outer wall of the liquid discharging pipe, a valve is arranged on the liquid discharging pipe, and a first bearing is fixedly arranged on the top of the material mixing tank. A second bearing is fixedly mounted at the bottom of the mixing tank; a liquid discharge pipe is fixedly mounted between the inner rings of the first bearing and the second bearing; wherein a plurality of residue filtering holes are formed in the liquid discharging pipe, a residue removing mechanism is installed in the liquid discharging pipe, and the residue removing mechanism can ascend and descend in the liquid discharging pipe and grind and clean the inner wall of the liquid discharging pipe and the residue filtering holes; wherein a driving mechanism is mounted in the mixing tank, and the driving mechanism is connected with the liquid discharge pipe and drives the liquid discharge pipe to rotate, so that filter residues blocked in the filter residue holes can be effectively cleaned and dredged, the filter residue cleaning efficiency is improved, and normal use of liquid discharge of the liquid discharge pipe is ensured.

The present invention relates to the technical field of polyaluminium chloride water purifiers, specifically discloses a water purifier based on polyaluminium chloride and a preparation method thereof, the water purifier is made by mixing polyaluminium chloride magnesium silicate composite solution, modified starch modified chitosan composite solution and magnetized active kaolin, ultrasonic dispersion, slaking and drying; wherein polyaluminium chloride magnesium silicate composite solution is made of aluminium chloride, magnesium chloride hexahydrate and trichloroethylsilane; modified starch modified chitosan composite solution is made of starch modified by dimethyl diallyl ammonium chloride and acrylamide, and chitosan modified by diethyltriamine pentaacetic acid; magnetized active kaolin is made of ferric chloride hexahydrate, sodium silicate and acidified kaolin. The water purifier of the present invention contains a variety of efficient flocculation adsorption components, not only has the function of traditional polyaluminium chloride mesh sweeping, but also can synchronously and efficiently remove pollutants such as ammonia nitrogen, total phosphorus, COD and suspended matter in water.

The application provides a photoresist waste liquid recycling device and process, by adding hydrochloric acid to the photoresist waste liquid in the acidification precipitation tank in the pretreatment module to adjust the pH value, the linear phenolic resin precipitation rate reaches more than 95%, and the linear phenolic resin can be used again to the production stage of the photoresist after centrifugal separation, a compound coagulant containing sulfide and polyaluminum chloride is added to the heavy metal capture tank in the pretreatment module, and the removal rate of heavy metal ions reaches 99.5%; then the photoresist fragments are separated by using an ultrafiltration device, and the diatomite modified by NaOH and polyetherimide is used for adsorption and decolorization, then two-stage vacuum distillation process is used to realize the recovery of high-purity solvents in the photoresist waste liquid, finally, the remaining residue is polymerized and cured by ultraviolet radiation, and the solid fuel with high heat value can also be prepared, so that the 'zero emission' and resource full recovery of the photoresist waste liquid are realized, and the treatment cost and environmental risk are significantly reduced.

The application discloses a preparation method of polyaluminum chloride, and is characterized by comprising the following steps: S1, adding aluminum ash and hydrochloric acid solution into an acidification reaction tank, heating and reacting, filtering after the reaction is completed, and passing the filtrate into a polymerization reaction kettle; S2, adding calcium carbonate into the polymerization reaction kettle in batches to carry out polymerization reaction, stopping the reaction after the calcium carbonate is completely dissolved and the PH of the solution is 3-5; S3, adding polyacrylamide and ferric chloride into the polymerization reaction kettle, and precipitating under 1-3 pa low pressure to obtain sludge and upper liquid, concentrating and crystallizing the upper liquid, crushing the crystal, and obtaining polyaluminum chloride. The application increases an automatic blocking mechanism below a crystallization and crushing tank, automatically blocks when the sub-packaging cylinder is filled with crystals, achieves the purpose of quantitative sub-packaging, and does not cause too much or too little crystals in the sub-packaging cylinder, and does not require staff to be always beside the machine.

The invention discloses a defluorination agent suitable for defluorination of electronic industrial wastewater as well as a preparation method and a defluorination method of the defluorination agent. The defluorination agent comprises 9-10 wt% of aluminum salt, 0.1-0.2 wt% of ferric salt, 0.6-1.1 wt% of an alkaline regulator and the balance of water, the aluminum salt is selected from one or more of polyaluminum chloride and aluminum sulfate, and the ferric salt is selected from one or more of ferric trichloride, ferric sulfate and polyferric sulfate. The fluorine removal agent provided by the invention can realize that the fluorine concentration of discharged water is lower than 1mg / L through one-stage / two-stage fluorine removal under a low-fluorine, medium-fluorine or high-fluorine water inlet condition, the optimal pH condition of reaction is reduced, the acid-base and agent use cost is saved, and meanwhile, the fluorine removal agent is simple in preparation method and can be applied to large-scale popularization and production.

The present invention discloses a method for preparing permeable bricks using aluminum ash, which belongs to the field of environmental engineering technology. The method comprises the following steps: S1, preparing a permeable brick base using bottom mud from a black and odorous water body as the main raw material, and uniformly adding nano-titanium dioxide into the permeable brick base; S2, preparing oily sludge and using the oily sludge to prepare an oily sludge binder; S3, processing the aluminum ash to prepare liquid polyaluminum chloride, which is crystallized to obtain powdered polyaluminum chloride; S4, adding the powdered polyaluminum chloride to the aluminum ash and grinding it again. The ground aluminum ash mixture is cross-linked with the oily sludge binder to form crystals coated on the permeable brick base; S5, calcining the permeable brick base coated with the crystals to obtain nano-titanium dioxide-loaded permeable bricks. This method can significantly increase the strength of the formed permeable bricks and improve the bonding ability of titanium dioxide with the permeable bricks.

The application provides an oil-containing wastewater treatment equipment and method based on low-temperature evaporation, and belongs to the technical field of wastewater treatment. The equipment comprises, which are arranged in series, a demulsifier reaction tank, a polyaluminum chloride reaction tank and a polyacrylamide reaction tank, and oil-containing wastewater flows through the three reaction tanks to realize continuous and staged flocculation; a filter pressing device is communicated with a discharge port of the polyacrylamide reaction tank, and is internally provided with an arc-shaped filter residue assembly, a rotary residue scraping assembly and a filter pressing cleaning assembly, and the three assemblies are cooperated to form integrated operations of filtering, salvaging, filter pressing and cleaning; and a low-temperature evaporation machine is connected to a liquid outlet end of the filter pressing device. The application realizes continuous demulsification and flocculation treatment through the multi-tank series connection, and batch waiting is not needed; the filter pressing device automatically cleans flocculation materials while filter pressing, so that blockage is avoided and manual cleaning is not needed during shutdown. The overall process is closely connected, and the degree of automation is high, so that the oil-containing wastewater treatment efficiency and continuous production capacity are significantly improved, and the water quality after treatment can reach the recycling standard.

The invention belongs to the field of preparation of water treatment chemicals, particularly relates to a method for preparing a high-performance polyaluminum chloride water purifying agent through waste acid-polymerization coupling, and aims at solving the problems that a product is unstable, the impurity content is high, and the waste residue amount is large. The method comprises the following steps: performing oxidation impurity removal pretreatment on industrial waste hydrochloric acid; synthesizing a polyaluminum chloride solution in a medium polymerization state aluminum form as a seed crystal by adopting an aluminum source raw material under the condition of controlling proper basicity; mixing the pretreated waste acid with medium-polymerization-state aluminum seed crystals, pumping the mixture into an inorganic ceramic membrane coupling reactor for polymerization reaction, and promoting the hydrolytic polymerization reaction balance of aluminum to move towards the direction of generating high-polymerization-degree aluminum seeds through the separation effect of a ceramic membrane; after the reaction is completed, the solution is purified and separated through a nanofiltration membrane system, the intercepted liquid is the high-performance polyaluminum chloride water purifying agent, and the permeated liquid is a salt solution containing sodium chloride and the like which can be recycled. The method fully utilizes industrial waste acid to prepare polyaluminum chloride, and has obvious environmental protection benefits and application values.

The invention relates to the technical field of sewage treatment, and particularly discloses a sewage treatment agent as well as a preparation method and application thereof. The sewage treatment agent comprises modified polyaluminum chloride, a low-temperature flocculant and a plurality of auxiliary components, the modified polyaluminum chloride is obtained by doping nano boron nitride and modifying with a low-temperature modifier, and the low-temperature flocculant is obtained by copolymerization of polyacrylamide and 2-acrylamide-2-methylpropanesulfonic acid; the preparation method mainly comprises the steps of raw material dissolution, mixing reaction, flocculation compounding and the like. The sewage treatment agent can be used for domestic sewage treatment in a low-temperature environment of 0-5 DEG C, has the advantages of excellent low-temperature resistance, high hydrolysis speed, high pollutant removal rate and good stability, and can effectively overcome the defect of poor low-temperature treatment effect of an existing agent.

The invention provides a composite dephosphorizing agent and a use method thereof, and belongs to the field of wastewater treatment. The invention provides a composite dephosphorizing agent which comprises the following components in percentage by mass: 10-75% of polyaluminum chloride, 15-89% of attapulgite and 1-10% of an attapulgite, graphene oxide and active metal ion composite material, the attapulgite, graphene oxide and active metal ion composite material is prepared from active metal ion modified attapulgite and graphene oxide loaded on the active metal ion modified attapulgite, active metal ions in the active metal ion modified attapulgite comprise iron ions or ferrous ions. According to the invention, the characteristics of the graphene material are ingeniously combined with the attapulgite material to increase the characteristics of the graphene, and meanwhile, the attapulgite is modified by active metal ions to further improve the ion exchange and ion chelation characteristics of the composite attapulgite, so that the attapulgite has the characteristic of removing phosphorus pollution.

This invention provides a method for the synergistic resource utilization of zinc-aluminum alloy welding slag and hot-dip galvanizing waste hydrochloric acid. The synergistic resource utilization method includes the following steps: (1) mixing zinc-aluminum alloy welding slag and hot-dip galvanizing waste hydrochloric acid, and performing dissolution and neutralization treatment to obtain a first treatment liquid; (2) extracting the first treatment liquid to obtain an extract and a raffinate; (3) back-extracting the extract to obtain a mixture of zinc chloride and ammonium chloride; and then performing evaporation and crystallization treatment to obtain zinc ammonium chloride; and finally, aging the raffinate to obtain polyaluminum ferric chloride. The synergistic resource utilization method of this invention is simple to operate, has low processing costs, and realizes the synergistic treatment of industrial waste zinc-aluminum alloy welding slag and hot-dip galvanizing waste hydrochloric acid, which has good economic and environmental benefits and is suitable for large-scale promotion and application.

The invention discloses a waste residue recovery device and method based on polyaluminum chloride processing, and relates to the technical field of polyaluminum chloride processing waste residue treatment.The waste residue recovery device specifically comprises a crushing storage tank and a tank cover, the top of the crushing storage tank is rotationally connected with the tank cover, and a storage hopper is installed at the top of the crushing storage tank; the inner wall of the bottom of the crushing storage tank is movably connected with a corrosion-resistant inner sleeve; through mechanical structure innovation, a centrifugal extrusion mechanism, track control and corrosion-resistant material optimization design are adopted, efficient dehydration, crushing and solid-liquid separation integrated treatment of PAC waste residues is achieved, the design avoids the tedious process that traditional equipment needs to treat crushing and dehydration step by step, the treatment period is shortened, and the treatment cost is reduced. Meanwhile, the problems of equipment loss and pollution risks in a strong acid environment are solved through a closed system, the operation environment safety is further guaranteed, the environmental protection requirement is met, and reliable technical support is provided for chemical waste residue recycling.

The invention provides modified polyaluminum chloride with high phosphorus removal performance and a preparation method and application thereof, and belongs to the technical field of modified polyaluminum chloride. The preparation method comprises the following steps: firstly, reacting aluminum chloride, zirconium oxychloride and an alkaline regulator in a water phase to prepare an aluminum-zirconium complex mother solution, then adding a polyhexamethylene biguanide solution into the aluminum-zirconium complex mother solution, and realizing effective compounding of organic long-chain molecules and inorganic complexes under the actions of static electricity, coordination, hydrogen bonds and the like; finally, mannitol serving as a polyhydric alcohol stabilizer is introduced into the organic-inorganic composite system, and premature polymerization and precipitation of the product are inhibited by means of the chelation of mannitol on a metal center and the steric hindrance effect of mannitol on molecules; according to the invention, the complexation of zirconium ions and strong current neutralization of polyhexamethylene biguanide form synergy, the removal efficiency of phosphate is improved, the formed flocculating constituent is more compact and has high settling velocity, and the application range of the product under complex water quality conditions is widened.

The invention discloses a continuous preparation process of a polyaluminum chloride water purifying agent, and belongs to the technical field of preparation of water purifying agents. The continuous preparation process of the polyaluminum chloride water purifying agent comprises the following steps: step 1, grinding secondary aluminum ash in a mortar, and sieving to obtain pretreated secondary aluminum ash; 2, the pretreated secondary aluminum ash is washed, filtered and dried, and washed secondary aluminum ash is obtained; and 3, adding the modified catalyst into the washed secondary aluminum ash, adding distilled water, stirring, sealing a reaction kettle, heating, stirring and reacting in a nitrogen environment, filtering after the reaction is finished to obtain filtrate, transferring the filtrate into a reactor, adding a saturated sodium carbonate solution, and curing to obtain the polyaluminum chloride water purifying agent. The polyaluminum chloride water purifying agent prepared by the method has high purity and low impurity content.

The utility model relates to the technical field of reaction kettles, in particular to a reaction kettle for producing and processing polyaluminum chloride. Comprising a reaction kettle body, a stirring module is arranged on the surface of the upper end of the reaction kettle body, a discharging pipe is fixedly communicated with the surface of the bottom end of the reaction kettle body, an adjusting mechanism is arranged on the arc surface of the reaction kettle body and comprises a feeding pipe and a material frame, and one end of the feeding pipe is fixedly communicated with the arc surface of the reaction kettle body; the surface of the material frame is fixedly connected with an acrylic plate, the surface of the bottom end of the material frame fixedly communicates with a butt joint pipe, the arc face of the butt joint pipe is connected with the inner wall of the feeding pipe in an inserted mode, the two sides of the arc face of the butt joint pipe are fixedly connected with fixing frames, the inner walls of the fixing frames are rotationally connected with rotating rods, and the arc face of the upper end of the feeding pipe is fixedly connected with a butt joint frame. The reaction kettle for producing and processing polyaluminum chloride has the advantages that auxiliary materials can be conveniently added into the reaction kettle, and the production efficiency and the quality of a final product can be effectively improved.

The invention discloses a composite flocculant based on nano calcium oxide and a preparation method thereof, and relates to the technical field of sewage treatment, the composite flocculant comprises the following raw materials by weight: 10-20 parts of modified nano calcium oxide, 40-50 parts of polyaluminum chloride, 25-35 parts of modified lignin, 150-160 parts of deionized water, and 20-30 parts of absolute ethyl alcohol. According to the composite flocculant, the modified nano calcium oxide, the modified lignin and other raw materials are used in a combined mode, the modified nano calcium oxide plays a role through slow release and can be magnetically adsorbed and recycled, secondary pollution is avoided, the composite flocculant is endowed with high environmental protection performance, the molecular weight, hydrophilicity and charge density of the modified lignin are improved, and the composite flocculant has the advantages of being environmentally friendly and free of pollution. The modified lignin and the modified nano calcium oxide can react and be cross-linked, and the composite flocculant is endowed with a relatively strong flocculation effect in cooperation with the use of the polyaluminum chloride, so that the purification of complex sewage is facilitated.

The utility model relates to the technical field of chemical production, in particular to a polyaluminum chloride spray drying tower which comprises a drying tower and a powder removing assembly, an electric heating wire is embedded in the drying tower, a servo motor is fixedly installed on the upper side of a top plate, and the output end of the servo motor rotationally penetrates through the lower side of the top plate. A top plate and a bottom plate are fixedly mounted at the upper and lower ends of the drying tower; the powder removing assembly comprises two symmetrically-arranged driving motors, a spiral scraping plate is installed on the inner wall of the drying tower in a sliding mode, two balancing weights are fixedly installed on the upper side of the spiral scraping plate, lifting lugs are fixedly installed on the upper sides of the balancing weights, and reels are fixedly installed at the output ends of the driving motors. According to the powder removing device, through the arranged powder removing assembly and the matched design of the driving motor, the reel, the steel wire rope and the spiral scraping plate, dry powder on the inner wall of the drying tower can be scraped off when the spiral scraping plate slides downwards on the inner wall of the drying tower, and polyaluminum chloride powder is prevented from remaining on the inner wall of the drying tower.

The utility model discloses a production system for producing polyaluminum chloride by utilizing aluminum ash, which comprises a first reaction unit, a second reaction unit and a second filter press, the first reaction unit comprises a first stirring tank and a first filter press, and the first stirring tank is used for stirring and reacting the aluminum ash subjected to denitrification and impurity removal, water and industrial hydrochloric acid; the second reaction unit comprises a second stirring tank, a first metering conveyor and a second metering conveyor, the second stirring tank is used for stirring the aluminum chloride filtrate output by the first filter press, and the first metering conveyor inputs an ammonia nitrogen degradation agent into the aluminum chloride filtrate of the second stirring tank; the second metering conveyor is used for adding calcium aluminate powder into the second stirring tank, so that the aluminum chloride filtrate and the calcium aluminate powder react to form polyaluminum chloride slurry. According to the production system for producing the polyaluminum chloride by utilizing the aluminum ash, the ammonia nitrogen content of the produced polyaluminum chloride can be reduced to reach the national standard, and the application of the aluminum ash in the industrial polyaluminum chloride water purifying agent industry is facilitated.

The present invention relates to the field of fiber materials, and discloses a polycrystalline alumina fiber and a preparation method thereof. The preparation method comprises the following steps: taking crystalline aluminum chloride, adding deionized water and mixing evenly, then adding a mixed solution of aluminum powder, tartaric acid, nitric acid and lactic acid, and heating under reflux to obtain a mother liquor of polyaluminum chloride; taking basic zirconium carbonate, glacial acetic acid and ethanol and mixing evenly to obtain a zirconium-containing solution, mixing the mother liquor of polyaluminum chloride, the zirconium-containing solution and tetraethyl orthosilicate evenly, then adding a fiber-forming aid, and concentrating by vacuum distillation to obtain a spinning colloid; centrifugally spinning the spinning colloid to form a fiber blank; drying the fiber blank and then performing heat treatment, and depositing a boron nitride nanolayer on its surface by chemical vapor deposition to prepare a polycrystalline alumina fiber with good high-temperature heat insulation, acid and alkali corrosion resistance and high tensile strength.