201 results about "Acid activation" patented technology

The invention discloses a method for preparing attapulgite modified by silane coupling agent, belonging to the technical field of development and utilization of the attapulgite. The method comprises the following steps: properly activating raw ores of the attapulgite with acid; refluxing the mixture of the acid activation attapulgite, the silane coupling agent and an organic solvent for 2-36 hours at the temperature of 50-120 DEG C; and then filtering and washing to obtain the attapulgite modified by silane coupling agent by filtering and washing the mixture. The invention adopts the silane coupling agent for treatment, enhances the interaction force between the attapulgite and organics and has good dispersity among organics. The invention lays the foundation for enlarging the application range of the attapulgite and increasing the added value of the attapulgite.

The invention discloses a preparation method and usage of a modified attapulgite adsorption material. The method comprises the following steps: modifying attapulgite which has undergone purification and acid activation with an amino-silane coupling agent so as to introduce amino onto the surface of attapulgite; subjecting amino and excess acrylic acid ester to a Michael addition reaction so as tointroduce ester groups, subjecting introduced ester groups and polyethylene polyamine to a Michael addition reaction, carrying out underpressure distillation to remove a solvent and excess reactants,and carrying out vacuum drying, grinding and sieving to obtain a finished product. According to the invention, polyethylene polyamine or alcamine compounds are bonded to the surface of attapulgite through covalent bonds, thereby substantially improving adsorption performance of attapulgite to metal ions.

The invention relates to the field of industrial water treatment and in particular relates to a method for treating polymer flooding oil-extraction wastewater by employing organic modified sepiolite. The method comprises the following steps: 1) acid activation, namely adding a sepiolite raw material into a hydrochloric acid solution, mixing, stirring, filtering, washing, and drying to obtain sepiolite powder subjected to acid activation; 2) thermal activation, namely roasting and dehydrating the sepiolite powder subjected to acid activation, and cooling and grinding to obtain sepiolite powder subjected to thermal activation; 3) organic modification, namely adding the sepiolite powder subjected to thermal activation into an ethanol aqueous solution of cetyl trimethyl ammonium bromide, mixing, stirring, filtering, washing, drying and grinding to prepare the organic modified sepiolite powder; and 4) adsorption, namely regulating the pH value of the polymer flooding oil-extraction wastewater by using an acid, adding a water-soluble aluminum salt, adding the organic modified sepiolite powder obtained in the step 3) for adsorption, stirring or shaking, standing and settling. The sepiolite serves as a raw material and is low-price and readily available, the process for activation and modification of the sepiolite is simple, and the sepiolite is non-toxic and harmless, has an obvious adsorption effect, rapid in treatment and high in adsorption amount.

The invention discloses a carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent and a preparation method thereof. The preparation method is characterized in that carbon-containing materials such as lignite carbocoal, anthracitic coal and bituminous coal carbocoal take amorphous or formed particle carbocoal, tetrabutyl titanate, absolute ethyl alcohol and the like as photo-catalyst active raw materials; firstly, the amorphous or formed particle carbocoal supports a photo-catalyst TiO2, transition metal oxide and the like through methods of ultrasonic activation of hydrogen peroxide, acid activation, alkaline activation and the like, and subsequently, the amorphous or formed particle carbocoal is activated by water vapour at a high temperature of 500-700 DEG C and then mechanically mixed with ZSM-5 or other NO adsorption molecular sieves, thereby finally obtaining the photo-catalytic desulfurization and denitration agent. The carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent has the characteristics of extensive sources and low price of active carbocoal; after TiO2 is supported, the carbocoal-based photo-catalytic oxidation fuel gas desulfurization and denitration agent has the effect of getting twice the result with half the effort during denitration; the ZSM-5 and other NO absorption molecule sieves can play the role of capturing NO; the prepared catalyst can be used for removing NOx in fuel gas of coal-fired power plants, coal-fired boilers, coal-fired kilns and the like through a low-temperature photo-catalytic oxidation method at a temperature which is less than or equal to 110 DEG C; the prepared catalyst also can be used for removing NOx in ventilated gases generated in road tunnels, underground parking garages, street intersections and the like.

The invention provides a Ca-system phosphating solution for magnesium alloy surfaces which takes the water as the solvent. Each liter of the solution comprises: calcium biphosphate of 5 to 80 g, phosphoric acid of 2 to 15 ml, nitrate of 2 to 15 g and polyphosphate of 0.1 to 5 g. For the process using the Ca-system phosphating solution to make surface treatment to the magnesium alloy, the process flow is degreasing, bath, acid activation, pure bath, surface conditioning, pure bath, conversion treatment, pure bath and drying; wherein, the concrete procedures of the conversion treatment in the process flow are that: the magnesium alloy workpiece made a pre-treatment is dipped into the Ca-system phosphating solution for treatment, the working temperature of the workpiece is between 20 and 35 DEG C, the conversion treatment time is between 20 seconds to 5 minutes. With the Ca-system phosphating solution for magnesium alloy surfaces of the invention and the conversion process thereof, the obtained membrane has good corrosion resistance, can meet the requirement of environmental protection; the conversion treatment can be made under room temperature without need to be heated, and has small energy consumption.

The invention relates to a preparation method of a particle retention and filtration aid using attapulgite as a raw material. The preparation method comprises the following steps of: (1) using the attapulgite as the raw material, drying, pulverizing, ball grinding and sieving to obtain powder; (2) purifying through mechanical stirring, ultrasonic treatment and centrifugal treatment by adding a dispersing agent; and (3) carrying out acid modification and microwave modification. A product of the method is a powdered particle product which is used as a particle retention and filtration aid and applied to the paper industry. The attapulgite purifying and modifying production process can realize continuous production, and the product has good dispersing property. Acid activation and microwave activation are combined, and the synergy greatly improves the activity of the product. By applying the preparation method, the attapulgite can be used as a raw material to produce high added-value products.

The invention provides a preparation method of magnetic modified bentonite. The method comprises the steps of mixing FeCl3.6H2O, sodium acetate, ethylene glycol and trisodium citrate and mixing and stirring for over 5h; adding bentonite subjected to thermal activation and acid activation and mixing and stirring for over 2 h; packaging a turbid liquid into a polytetrafluoroethylene reactor, reacting at 150-200 DEG C for over 10h; washing taken black solid by using water and ethanol for multiple times in cycle, carrying out magnetic separation, drying and grinding to obtain the magnetic modified bentonite. The removal rate of the magnetic modified bentonite on methylene blue reaches over 97%, and meanwhile, separation from a water body is facilitated by using the magnetism after adsorption. In addition, the magnetic modified bentonite is cheap and available in raw materials, simple in preparation technology, low in cost and beneficial to industrialization.

The invention relates to a semiconductor lead frame manufacturing technology which comprises the steps of stamping, surface treatment and cut-forming. The technology is characterized in that the surface treatment process specifically comprises the steps of electrolytic degreasing, washing, acid activation, washing, nickel plating, washing, alkaline copper plating, washing, acid copper plating, washing, silver preplating, washing, silver plating, silver removing, washing, protective solution plating, washing and drying. Plated layers of a semiconductor lead frame manufactured with the method are high in adhesive force and do not fall off easily. Meanwhile, the semiconductor lead frame is free of deformation and oversize, high in quality, and long in service life.

The invention belongs to the technical field of lithium ion cells, and in particular discloses an activating method of a cathode material, which comprises the step of: under a water and oxygen-free environment, soaking the cathode material in an activating solution to activate the cathode material, wherein the general formula of the cathode material is xLi2MnO3.yLiMO3, x is more than 0 or less than 1, y is equal to 1-x, M is a metal element, both Li2MnO3 and LiMO3 have a laminated structure, the activating solution is an organic solution of an activating agent, and the activating agent is NO2BF4 or NO2PF4. The method provided by the invention can not cause loss of the Mn element in the cathode material and introduction of impurities in the generated cathode material. Meanwhile, because the activation is not acid activation, a cubic structure for damaging an oxygen layer is avoided being brought by the acid activation, problems of high capacity attenuation and reduced cycle performance of the cathode material prepared in the invention are avoided.

The invention relates to a nano SiO2 microsphere, a water-repelling agent, preparation methods of the nano SiO2 microspheres and the water-repelling agent, and water-repelling glass. High-activity microspheres within a certain particle size range are formed by use of a two-step method of base catalyzed silicate hydrolysis and acid activation; appropriate perfluoroalkyl-containing silane hydrolysate is added to a sol containing the SiO2 microspheres, the surface of the SiO2 microspheres is modified by the perfluoroalkyl-containing silane by use of stirring and mixing for certain time, and then the water-repelling agent is formed; the water-repelling agent is applied to the surface of a pretreated glass substrate so that a water-repelling film having relatively high hydrophobicity and durability can be formed. The nano SiO2 microsphere and the water-repelling agent are simple in process, low in cost, remarkable in effect and capable of improving the view clarity of drivers and passengers in overcast and rain weather and improving the safety if being applied to the automobile glass.

The invention discloses a continuous electroplating process, which includes the following steps: (1) ultrasonic degreasing to realize the removal of grease on the surface of the piece to be plated; (2) electrolytic degreasing to realize further removal of oily substances on the surface of the piece to be plated; (3) ) acid activation, activate the surface of the piece to be plated, and improve the efficiency of subsequent electroplating; (4) nickel plating, realize fast nickel plating, can be used as primer nickel, and can also be used as golden nickel; (5) gold plating, realize fast gold plating; (6) ) tin plating to achieve fast and high-strength tin plating, especially after adding water-soluble fibers, the tin coating has better fastness; (7) ultrasonic hot water cleaning to clean the coating surface; The small holes are sealed to improve the anti-corrosion ability of the coating; (9) drying, and become the final product after drying; through continuous electroplating process, simultaneous electroplating of multiple metals is realized.

The invention discloses a polyethyleneimine modified sepiolite adsorbent as well as a preparation method and an application thereof. The polyethyleneimine modified sepiolite adsorbent comprises the following steps: (1) adding sepiolite powder into an acid solution, stirring to separate out the sepiolite powder, washing until the sepiolite powder is neutral, drying, and grinding, so as to obtain acid-activated sepiolite powder; and (2) dissolving polyethyleneimine into an alcohol solvent, adding the acid-activated sepiolite powder obtained in the step (1), stirring, drying, and grinding, so as to obtain the polyethyleneimine modified sepiolite adsorbent. The preparation method has the beneficial effects that the modified sepiolite adsorbent can be obtained by two simple steps of acid activation and amine modification, the preparation process is simple, the operation is easy, preparation conditions are mild, equipment requirements are low, the energy consumption is low, and the production cost is low. The modified sepiolite adsorbent prepared by virtue of the preparation method is low in cost and excellent in performance and has an adsorption effect on carbon dioxide.

The invention relates to a functional attapulgite particle with amido on a surface and oxidation-reduction initiation activity and a preparation method thereof. The preparation method comprises the following steps: purifying attapulgite raw ores; then carrying out acid activation; finally dispersing attapulgite subjected to the acid activation and amido alkoxy silane into an organic solvent, carrying out back flowing under the condition of 110-180 DEG C for 6-12 hours, and filtering, washing, drying and smashing products after reaction is finished to obtain the product. The preparation method disclosed by the invention grafts the amido alkoxy silane to the surface of the attapulgite through chemical bonding by adopting a dealcoholization method, thereby overcoming the defects of reduced coupling efficiency, which is caused due to the polycondensation reaction of silicon hydroxyl in a hydrolization method, of the traditional coupling agent; and the prepared functional attapulgite particle disclosed by the invention achieves high amido content of 5.82 mmol / g on the surface, can be used for initiating the polymerization reaction through surface initiation graft polymerization reaction and creates the precondition for the additional value of the attapulgite.

The invention provides a polylactic acid antibacterial thin film and a preparation method thereof, and relates to the technical field of polymer materials. The preparation method includes the steps: carrying out acid activation treatment of layered clay LDHs; then forming an organic coating material of tannic acid and ferric ions on the surface of the acid activated LDHs, to obtain LDHs@TA-Fe (III); adding glutathione to a silver nitrate solution to obtain a nano silver precursor, and carrying out a reaction of the LDHs@TA-Fe (III) with the nano silver precursor to obtain nano silver loaded modified layered clay; and finally, mixing the nano silver loaded modified layered clay and polylactic acid to form a film, and thus obtaining the polylactic acid antibacterial thin film which has excellent mechanical properties, barrier properties and antibacterial properties.

The invention discloses a preparation method for calcium hydrate loading activated clay, and belongs to the bentonite deep processing technology field. The calcium hydrate loading activated clay is prepared after steps of blending, slurrying, acid activation reaction, first press filtration, washing, secondary press filtration, alkalization, third press filtration, drying, crushing and the like. The prepared calcium hydrate loading activated clay is high and stable in quality, the preparation technology is simple, the cycle is short, safety and production efficiency are high, and the production cost and energy consumption are low. Obtained waste acid is recycled, acid and sewage processing cost is lowered, and energy saving and emission reduction effects are achieved.

The invention provides a magnetron separating photocatalyst used for dye sewage treatment and a preparation method for the magnetron separating photocatalyst. The magnetron separating photocatalyst for dye sewage treatment is characterized by comprising magnetic attapulgite, wherein octacarboxylic phthalocyanine aluminum and cobalt or derivatives of octacarboxylic phthalocyanine aluminum and cobalt are loaded on the magnetic attapulgite. The preparation method for the magnetron separating photocatalyst for dye sewage treatment is characterized by comprising: S1, dispersing attapulgite subjected to acid activation treatment in distilled water, adding a FeCl3 solution, a FeCl2 solution and a NaOH solution into the obtained dispersion liquid, and preparing the magnetic attapulgite by virtue of an in-situ synthetic method; and S2, mixing the magnetic attapulgite with octacarboxylic phthalocyanine aluminum and cobalt or derivatives of octacarboxylic phthalocyanine aluminum and cobalt, and preparing the magnetron separating photocatalyst for dye sewage treatment by virtue of an ultrasonic stirring method. The photocatalyst prepared not only has obvious dye degradation effect, but also can be recycled through a magnetic separation technology.

The invention discloses a preparation method of a semi-coke flue gas denitrfying agent used in the low-temperature catalytic oxidation. The method is characterized in that the denitrfying agent is prepared from semi-coke through acid activation, alkali activation and high-temperature activation; the acid activation process comprises the following steps: mixing semi-coke particles with an acidic solution with the mass concentration of 5-85% in the liquid solid ratio of 0.5-5.0, processing the mixture at 30-100 DEG C for 0.5-8h, rinsing the product to be neutral and drying at 110 DEG C for 6h; the alkali activation process comprises the following steps: mixing the product of the acid activation process with an alkaline solution with the mass concentration of 5-85% in the liquid solid ratio of 0.5-5.0, processing the mixture at 30-100 DEG C for 0.5-8h, rinsing the product to be neutral and drying at 110 DEG C for 6h; and the high-temperature activation process comprises the following steps: roasting the product of the alkali activation process in N2 atmosphere with 0-10% of O2 for 1-8h under the conditions that the temperature is 500-800 DEG C, the airspeed is 50-1000h<-1> and the moisture content is 0-90%. The invention is characterized in that semi-coke has wide sources and cheap price and the prepared catalyst can be used in the low-temperature (not more than 110 DEG C) catalytic oxidation for removing NOx in the flue gas.

The invention provides a method for preparing an oil fracturing proppant from high-aluminum fly ash, which comprises the following steps: by using the high-aluminum fly ash as the raw material, pretreating, proportioning, carrying out ball milling, granulating and sintering to obtain the oil fracturing proppant. The pretreatment process comprises the steps of pre-desilicication, acid activation and the like. The treated high-aluminum fly ash has the advantages of uniform composition, high mullite content and low impurity content. The oil fracturing proppant subjected to proportioning, ball milling, granulating and sintering has the advantages of high addition amount of high-aluminum fly ash, low density and medium strength. The method has the advantages of wide raw material sources, low production cost, obvious environmental benefit and good quality of the oil fracturing proppant, and has obvious market advantages.

The invention aims to provide a montmorillonite loaded calcium hydroxide antacid which uses montmorillonite loaded calcium hydroxide as the antacid on the basis of acid activation of montmorillonite loaded calcium hydroxide, and solves the conventional problem caused by direct contact of active components of the antacid and the gastric mucosa, wherein the montmorillonite has a gastric mucosa protection function simultaneously. The montmorillonite loaded calcium hydroxide antacid is characterized in that the antacid takes medicinal montmorillonite as the raw material, the montmorillonite is taken as a carrier after acid activation, loaded calcium hydroxide serves as an active ingredient, fatty acid is adopted for surface modification, the carrier of the obtained antacid is stable and insoluble, calcium hydroxide serving as the active ingredient can be continuously and firmly loaded on the carrier, the alkaline intensity is weakened, excessive taking of the antacid cannot cause too high gastric pH, and further, the carrier improves the dispersibility of calcium hydroxide serving as the active ingredient and forms a protective barrier, so that mucosa stimulation is avoided.

The invention discloses a preparation method of a modified oil shale semicoke adsorbent. The preparation method includes: adopting oil shale as a basic raw material; adopting a microwave depressurization dry distillation method to prepare oil shale semicoke; combining with a microwave high-pressure hydrothermal method, an ultrasonic mixed acid activation method and an ultrasonic mixed alkali activation method to perform two-step or three-step modification on the oil shale semicoke to prepare a proper modified oil shale semicoke adsorbent. Advantages of each method are fully utilized, and various activation methods are combined, so that activated oil shale semicoke containing a lot of functional groups on the surface is prepared, and the preparation method has the advantages of extensive raw material source, economical efficiency, environment friendliness and low production cost; by the method, the oil shale semicoke which is industrial waste can be recycled and changed into things of value, conversion of low-added-value products to high-added-value products is realized, and serious threat to environment, ecology and human health caused by the oil shale semicoke is reduced.

The invention relates to a production method and applications of cyclic carbonate. According to the present invention, the used catalyst is a multifunctional biomimetic heterogeneous catalyst formed by an organic porous copolymer based on metalloporphyrin and a quaternary phosphonium salt, the catalyst carrier is formed by carrying out mixed polymerization on alkylene-functionalized metalloporphyrin and a quaternary phosphonium salt, and the active component of the catalyst comprises metalloporphyrin (as a Lewis acid activation epoxy compound) and a quaternary phosphonium salt (as a ring-opening nucleophilic reagent) functional group; the obtained multifunctional biomimetic heterogeneous catalyst can be used for fixed beds, slurry beds, kettle type reactors, trickle beds and other reactors; the obtained multifunctional biomimetic heterogeneous catalyst has good performance, extremely high activity (2000-6000 h<-1>), good selectivity (more than 99%) of the formed cyclic carbonate and strong substrate applicability in the cyclic carbonate production reaction between the epoxy compound and the carbon dioxide, further has good stability, and can be simply and efficiently separated fromthe substrate and the product.

The present invention discloses a method for resource utilization of desilting sediment. The method comprises: (1) respectively drying desilting sediment and mature aquatic plants; (2) respectively crushing the dried desilting sediment and the dried mature aquatic plants; (3) completely mixing the crushed desilting sediment and the crushed mature aquatic plants according to a mass ratio of 1:3-5 to obtain a mixture; (4) carrying out high temperature pyrolysis on the mixture under a hypoxia condition to obtain biological charcoal; and (5) carrying out acid activation on the biological charcoal to obtain the activated biological charcoal, wherein the activated biological charcoal is the soil remediation agent and is suitable for soil remediation and improvement.

The invention provides a surface preparation method of a zinc alloy product. The method comprises the following steps, namely, surface polishing, degreasing and oil removal, acid activation and galvanization which are carried out to the zinc alloy product in sequence, wherein, the method also comprises the step of forming a conversion coating on the surface of the zinc alloy product before the galvanization; a galvanization layer and the zinc alloy surface formed by utilizing the surface preparation method of the zinc alloy product provided by the invention have relatively strong binding force and relatively strong anti-corrosion performance.

The invention discloses a hardware chromium plating technology which comprises the following steps: performing degreasing so as to remove grease from the surface of hardware; performing cleaning repeatedly so as to further remove grease from the surface of the hardware; performing wax removal so as to remove a wax layer from the surface of the hardware; performing oil removal so as to remove an oil layer from the surface of the hardware through a surfactant; performing anodic electrolysis oil removal so as to further remove the oil layer from the from the surface of the hardware; performing acid activation repeatedly so as to increase the electroplating efficiency; performing bright copper plating so that a final plating has adhesive force, corrosion resistance, wear resistance and glossiness; performing acid copper plate so that the final plating has adhesive force, corrosion resistance, wear resistance and glossiness; performing nickel plating so that the final plating has adhesive force, corrosion resistance, wear resistance and glossiness; performing golden nickel so that co-deposition of particles and nickel is realized to form a composite plating; performing chromium plating so that the final plating has adhesive force, corrosion resistance, wear resistance and glossiness; performing passivation; performing air blowing; and performing baking and the like so as to improve the adhesive force, corrosion resistance, wear resistance and glossiness of a chromium plating.

The invention discloses a method for preparing a soil heavy metal solidification material by using oil shale semi-coke, which comprises the following steps of: crushing oil shale semi-coke, then carrying out wet grinding, sieving through 200 meshes, adding acid liquor for acid activation treatment, carrying out pressure filtration and dehydration, and then sending the product into a rotary kiln byusing a double screw, calcining in nitrogen atmosphere, pulverizing, and sieving to obtain the final product. According to the invention, the adsorption sites of heavy metal ions can be increased andthe adsorption capacity can be improved by activating mineral silica chemical bonds in the semi-coke through acid treatment; the micro-pore and mesoporous structures in the semi-coke are activated through calcination treatment; meanwhile, organic components are converted into active carbon, and the adsorption performance of heavy metal ions is further improved. The method not only achieves resource utilization of the oil shale semi-coke waste residue, but also can be used for passivating heavy metals in soil, and has good ecological benefit and economic benefit.

The invention discloses a chromium plating process of nuclear generator unit members, which is characterized by comprising a step of surface treatment before plating, a step of chromium plating treatment and a step of surface treatment after plating. The step of surface treatment before plating comprises the following steps: (a) oil removal treatment, (b) tool protection and (c) acid activation treatment. The step of chromium plating treatment comprises the following steps: putting the treated parts in a water bath of 50 DEG C to 60 DEG C for preheating for 3-10 min, heating a plating solution up to 50-60 DEG C, putting in plating parts, and chromium-plating for 25-30 min with multi-stage power supply under the conditions that the current density is 20-46 A / dm2 and the impact current density is 50-70 A / dm2. The step of surface treatment after plating comprises the following steps: washing with clear water and then rinsing with hot water (more than or equal to 80 DEG C) for 10-30 seconds, washing with pure water until neutral, dismounting the tools, washing with water and blow-drying. The process has the advantages that: the part coatings made by the chromium plating process are good in uniformity, bonding power and compactness.

The invention provides a modified attapulgite material and its preparation and application methods. The modified attapulgite is prepared by: ultrasonically treating attapulgite in HCL solution, filtering, washing, drying, heating to 350+ / -5 DEG C for activation, and cooling to room temperature to obtain intermediate A; dissolving MnCl2.4H2O in isopropanol, adding the intermediate A, stirring and ultrasonically processing, adding potassium permanganate solution, refluxing at 87+ / -2 DEG C, cooling to room temperature, filtering by suction, washing with isopropanol solution until a clear liquid is formed, and drying at 80-100 DEG C. Through acid activation and thermal activation, specific surface area is enlarged, attachment active sites for bivalent manganese ions are increased; the activated attapulgite can adsorb bivalent manganese ions under anhydrous condition, and it is possible to effectively avoid the competition between water and the bivalent manganese ions; the number of the bivalent manganese ions is under control, it is guaranteed that post-adsorbing solution contains few bivalent manage ions, and no influence is caused to further reaction.

The invention discloses a denitration catalyst material, and a preparation method and application thereof. The catalyst uses industrial waste gas red mud as precursors; a series of pretreatment is performed to obtain a composite oxide denitration catalyst taking iron and aluminum as main active ingredients. The method comprises the following steps of preparing a red mud suspension; regulating the pH value of the red mud suspension to 6.5 to 7.5 by dilute hydrochloric acid; performing acid activation on the red mud. The prepared catalyst material uses iron base industrial waste red mud, so that the manufacturing cost of the catalyst is greatly reduced. A simple process measure is used; the preparation of the denitration catalyst is realized; meanwhile, a novel method of red mud resource utilization is provided. The prepared catalyst cannot be easily lost; the service life is long; pollution cannot be caused on the environment; the serious environment problem of secondary pollution and the like due to heavy metal vanadium loss in the application of a conventional vanadium series catalyst is solved.

The invention relates to a method for synthesizing 4A molecular sieves by using bentonite and attapulgite as raw materials. The method comprises the following steps of: (1) performing acid activation on the bentonite; (2) activating the attapulgite at high temperature; (3) performing alkali treatment; (4) crystallizing; and (5) washing. According to the method, the bentonite and the attapulgite are used as the raw materials, and SiO2 in the bentonite and the attapulgite is used as a silicon source to prepare the 4A molecular sieves suitable for detergent additives. Compared with the prior art, the method has the advantages that: environmental pollution and energy waste are reduced; the preparation cost of the 4A molecular sieves is reduced; process equipment is simple and is easy to control; and new ways for developing and utilizing the bentonite and the attapulgite are opened up.