248 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 relates to the technical field of water treatment, and discloses a modified polyaluminum chloride flocculant and a preparation method thereof.The modified polyaluminum chloride flocculant is prepared from, by weight, 50-65 parts of polyaluminum chloride, 8-12 parts of magnesium silicate, 5-8 parts of carboxymethyl chitosan, 15-25 parts of polyaluminum ferric chloride and 3-5 parts of tea polyphenol; the molar ratio of aluminum ions to iron ions in the modified polyaluminum chloride flocculant is (3-4.5): 1. According to the invention, an inorganic-organic dual-modifier synergistic effect mechanism is adopted to construct a'rigid framework-flexible network 'composite structure, and the structure can significantly improve the adsorption capacity of Pb < 2 + >. Meanwhile, the mechanical property of the flocculating agent is improved, so that the flocculating agent can be applied to a high-turbulence environment.

The invention relates to the technical field of aluminum electrolyte recovery, in particular to a waste aluminum electrolyte resource utilization method. The waste aluminum electrolyte resource utilization method comprises the following steps that waste aluminum electrolyte and a reactant are subjected to a reaction in a closed container, a product obtained after the reaction is completed is washed in water, then first solid-liquid separation is carried out to obtain a solid, aluminum fluoride is obtained after drying, and aluminum fluoride is obtained after second solid-liquid separation is carried out. The reactant is selected from one or two of anhydrous aluminum chloride and polyaluminum chloride, and the reaction temperature is not lower than 200 DEG C. By utilizing the physical characteristic that the melting point of the reactant is higher than the boiling point, the reactant forms a solid phase-liquid phase-gas phase three-phase coexistence system in a closed space at the temperature higher than the melting point and the boiling point, so that the reactant can more efficiently perform molecular collision and mutual diffusion at an interface, thereby accelerating the reaction rate and improving the conversion rate.

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 relates to the technical field of water treatment, and discloses a sewage mixing flocculation sedimentation tank with a dosing system and a sewage treatment process, the sewage treatment process comprises the following steps: (1) sewage enters a pretreatment unit, and large-particle suspended solids are removed; (2) enabling the sewage to flow into a pH regulating tank, adding a pH regulator through a dosing system, and regulating the pH value to 9-11; (3) passing through a coagulation reaction tank, adding ferrous sulfate to reduce hexavalent chromium into trivalent chromium, and promoting a flocculation reaction; and (4) further adding polyaluminum chloride through the flocculation reaction tank to form floc. Through a multi-unit combined treatment process, suspended solids and various heavy metals in the sewage are gradually removed, and the effluent quality is ensured to reach the standard. Compact and reasonable process layout is adopted, the occupied area is reduced, and the device is suitable for small and medium-sized sewage treatment plants. An automatic dosing control system is introduced, dosing is accurate, and the operation cost is reduced.

The present invention relates to the technical field of refractory materials, and in particular to a magnesium spinel hot wet gunning material, a preparation method and an application thereof. The magnesium spinel hot wet gunning material comprises: 45 wt%~60 wt% of magnesium spinel brick waste; 20 wt%~25 wt% of magnesia sand; 15 wt%~20 wt% of spinel; 5 wt%~10 wt% of α-alumina micropowder; 5 wt%~10 wt% of binder; 1 wt%~2 wt% of aluminum powder; 0.1 wt%~0.2 wt% of water reducer; 1 wt%~3 wt% of saturated polyaluminum chloride solution; the sum of the amounts of the components is 100%. The magnesium spinel hot wet gunning material has the advantages of good high-temperature mechanical strength, long service life and low production cost during use through the combination of various components, and is not easy to generate dust.

The invention provides a composite polyaluminum ferric chloride water purifying agent as well as a preparation method and application thereof, and belongs to the technical field of waste resource recycling and municipal sewage treatment. The industrial hazardous waste aluminum ash is subjected to innocent treatment and then reacts with the pickling steel waste liquid of the steel mill, and the polyaluminum ferric chloride meeting the industrial standard is prepared. The polyaluminum ferric chloride and a cationic adsorbent are compounded according to a specific proportion to obtain the composite polyaluminum ferric chloride water purifying agent. According to the method provided by the invention, the resource recycling of hazardous wastes is realized, and the composite polyaluminum ferric chloride water purifying agent obtained by the method is used for treating municipal sewage, so that the treated water quality can reach the first-grade discharge standard A.

The present invention discloses a low-temperature resistant and early-strength type alkali-free liquid accelerating agent and its preparation method, belonging to the technical field of alkali-free liquid accelerating agents. The composition includes 12-15 parts of aluminum sulfate, 2-5 parts of sodium thiocyanate embedded by β-cyclodextrin, 5-8 parts of calcium hydroxide deactivator, 3-5 parts of fiber, 5-10 parts of hydrophilic polymer substance, 3-5 parts of cationic surfactant, 6-10 parts of polyaluminum chloride, and 2-3 parts of air-entraining agent. The low-temperature resistant and early-strength type alkali-free liquid accelerating agent of the present invention can improve the frost resistance of sulfate alkali-free accelerating agents, reduce the viscosity of cement slurry, promote the hydration reaction of C3S, shorten the setting time of concrete, and improve the later strength of concrete.

The invention discloses a process for producing polyaluminum chloride by recycling aluminum ash. The process comprises a primary aluminum ash pretreatment process, a secondary aluminum ash deamination process, an ammonium chloride crystallization process, a liquid polyaluminum chloride process and a solid polyaluminum chloride process, the primary aluminum ash pretreatment procedure comprises a first cyclone separator, a ball mill, a screening machine and a bag-type dust collector, the input end of the first cyclone separator is connected with a primary aluminum ash bin through conveying equipment, the coarse ash end of the first cyclone separator is connected with a feeding port of the ball mill, and a discharging port of the ball mill is connected with a feeding port of the screening machine; fine powder screened by the screening machine and secondary aluminum ash fine powder discharged by the first cyclone separator are collected into a secondary aluminum ash bin, and dust outlets of the first cyclone separator, the ball mill and the screening machine are connected with a dust inlet of the bag-type dust collector through pipelines. By arranging a series of structures, the produced polyaluminum chloride is high in purity, the economic benefit of the process is improved, tail gas is washed, and the pollution is reduced.

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 relates to the technical field of wastewater treatment, in particular to a fluorine removal agent for deep fluorine removal and a preparation method thereof, and the fluorine removal agent for deep fluorine removal comprises the following raw materials by weight: 2-5 parts of chitosan; 65-90 parts of polyaluminum chloride; 5-15 parts of magnesium oxide; 1-5 parts of titanium dioxide; 1-5 parts of manganese oxide; and 1-5 parts of lanthanum oxide. The fluorine removal agent has the beneficial effects that the obtained fluorine removal agent gets rid of the constraint of traditional calcium salt, a key catalyst (such as titanium dioxide, manganese dioxide and other transition metal oxides) is introduced through comparison and selection on the basis of controlling the compatibility material combination and synthesis reaction process, the catalyst has a catalysis function on a complex reaction, the adsorption capacity of the fluorine removal agent can be improved, and the fluorine removal effect is improved. And a micro-flocculation core growth position is provided to generate an adsorption and clamping effect. The fluorine ion content of the pretreated fluorine-containing wastewater (the fluorine ion content is 20 mg / L or below) can be reduced to 2 mg / L or below, and the fluorine ion removal rate reaches 90% or above.

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 discloses a coagulant for industrial wastewater treatment and a preparation method thereof, and belongs to the technical field of water treatment.The coagulant comprises a main flocculant and an auxiliary flocculant, the main flocculant is polyferric sulfate and / or polyaluminum chloride, and the auxiliary flocculant is organic modified diatomite; the organic modified diatomite is prepared by condensing aminated diatomite and a carboxylation modifier; the aminated diatomite is diatomite treated by an aminated silane coupling agent. The auxiliary flocculant not only has a porous characteristic, active functional groups on the surface can adsorb metal cations, and the auxiliary flocculant can be integrally used as a crystal nucleus to promote growth and aggregation of other precipitates (such as ferric hydroxide, aluminum hydroxide and the like) on the surface, so that the precipitation process is accelerated, the removal efficiency of pollutants in wastewater is improved, and the wastewater treatment effect is improved. The effect of enhancing coagulation is achieved.

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 invention discloses a low-temperature-resistant early-strength alkali-free liquid accelerator and a preparation method thereof, and belongs to the technical field of alkali-free liquid accelerators, the low-temperature-resistant early-strength alkali-free liquid accelerator comprises 12-15 parts of aluminum sulfate, 2-5 parts of beta-cyclodextrin embedded sodium thiocyanate, 5-8 parts of a calcium hydroxide inactivator, 3-5 parts of fiber, 5-10 parts of a hydrophilic polymer substance, 3-5 parts of a cationic surfactant, 6-10 parts of polyaluminum chloride, and 2-3 parts of an air entraining agent. The low-temperature-resistant early-strength alkali-free liquid accelerator can improve the frost resistance of a sulfate alkali-free accelerator, reduce the viscosity of cement paste, promote the hydration reaction of C3S, shorten the setting time of concrete and improve the later strength of the concrete.

The invention relates to a recyclable water treatment agent based on polyaluminum chloride and a preparation method thereof, and belongs to the technical field of sewage treatment. According to the recyclable water treatment agent, hollow porous magnetic ferroferric oxide serves as a carrier, di-n-butylamine and 3-chloropropyltrimethoxysilane are used for substitution to prepare a surface treatment agent, the surface treatment agent is loaded to the surface of the carrier through the coupling effect, a tertiary amine structure in molecules of the surface treatment agent is coordinated with aluminum chloride, and the recyclable water treatment agent is prepared under the alkaline hot reflux condition. Polyaluminum chloride is formed on the surface in situ, a quaternary ammonium structure is formed by bromoethanol and tertiary amine in the polymerization process, the hollow porous carrier has good suspension dispersion capacity in sewage, and the surface quaternary ammonium structure and polyaluminum chloride form a charge neutralization-flocculation dual mechanism, so that efficient and deep purification is realized; meanwhile, quick separation and recovery can be achieved through an external magnetic field, and efficient recovery of polyaluminum chloride is achieved.

The utility model provides an efficient drying polyaluminum chloride filter pressing mechanism, which belongs to the technical field of water treatment agent processing equipment, and comprises a plate frame type filter pressing device and an auxiliary mechanism communicated with the plate frame type filter pressing device, the auxiliary mechanism comprises a fan device arranged on one side of the plate frame type filter pressing device, the fan device is connected with a wind gathering cover, and the wind gathering cover is connected with a water outlet of the plate frame type filter pressing device. The other end of the air gathering cover is connected with heating equipment, an air supply pipeline is arranged on the heating equipment, the other end of the air supply pipeline is connected with a flow dividing box, a plurality of flow dividing pipelines are arranged on the flow dividing box, and the flow dividing pipelines are communicated with the plate frame type filter pressing equipment. The fan equipment supplies air to the heating equipment through the air gathering cover, so that the air passing through the heating equipment is heated, then enters the flow dividing box through the air supply pipeline and then enters the flow dividing pipeline in the flow dividing box in a flow dividing manner, hot air flow is supplied to a filter cake in the plate and frame type filter pressing equipment when the plate and frame type filter pressing equipment carries out filter pressing, and then water in the filter cake is removed; the production efficiency is improved.

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 invention relates to a method for preparing a polyaluminum chloride product for drinking water treatment. The method comprises the following steps: a) providing a liquid raw material containing PAC; b) adding calcium aluminate, which is substantially free of SiO2, to the PAC-containing liquid feedstock; and c) optionally filtering to obtain a liquid polyaluminum chloride product. The polyaluminum chloride product prepared by the method disclosed by the invention has the advantages of high Al2O3 concentration, high basicity and high stability.

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 an oil-water separating agent for an oil field, and relates to the technical field of oilfield chemistry. The invention discloses a water-based composite flocculant, which is prepared from the following raw materials in parts by weight: 150 to 250 parts of polyaluminum chloride, 80 to 120 parts of polyacrylamide, 50 to 100 parts of modified starch, 30 to 60 parts of sodium dodecyl benzene sulfonate, 20 to 40 parts of polyoxyethylene hydrophobic sorbitol fatty acid ester, 10 to 30 parts of simethicone, 5 to 15 parts of sodium hydroxide, 3 to 10 parts of hydrochloric acid and 300 to 500 parts of deionized water. The invention further discloses a preparation method of the oil-water separating agent for the oil field, the oil-water separating agent for the oil field and the preparation method of the oil-water separating agent remarkably improve the oil-water separating efficiency through raw material proportioning, the problem that a traditional oil-water separating agent is not ideal in separating effect is effectively solved, and the oil-water separating agent is simple in preparation process and low in cost. The oil-water separating agent has the advantages of easily available raw materials and relatively low cost, is beneficial to wide application in oilfield exploitation, reduces the exploitation cost, pays attention to the environmental protection concept in the preparation process, and avoids the generation of harmful byproducts.

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.