329results about How to "Simple technical process" patented technology

The invention relates to the field of porous materials, in particular to a hollow foam material as well as a preparation method and an application thereof. The hollow foam material is formed by three-dimensional connective support framework networks from the macroscopic angle, the support frameworks are microchannels with hollow structures in three-dimensional connection, the walls of the microchannels are compact or contain nano-scale pores and / or micro-scale pores. The hollow foam material with three-dimensional connective networks is prepared from a polymer resin foam material with three-dimensional connective networks with the structure design and the preparation method. The hollow foam material has three types of pores with adjustable sizes: macroscopic three-dimensional connective open meshes, three-dimensional connective hollow microchannels and nano-scale pores and / or micro-scale pores in microchannel wall bodies. The innovative structure characteristic of the three-dimensionalconnective hollow microchannels of the hollow foam material lays a foundation for application of the hollow foam material.

The invention discloses a building silt soil non-sintered ceramic aggregate, which is characterized by comprising solid components and water, wherein every kilogram of solid components comprise the following components in percentage by weight: 60-80 percent of building silt soil, 2-5 percent of cement, 2-5 percent of quick lime, 2-5 percent of desulfurized gypsum, 2-7 percent of perlite, 2-8 percent of fly ash and 5-10 percent of water glass; and the amount of the water accounts for 45-60 percent of the total mass of the solid components. The invention also discloses a preparation method of the ceramic aggregate. The ceramic aggregate and the preparation method thereof have the characteristics of simple pretreatment of building silt soil, simple preparation process and capabilities of eliminating industrial wastes such as fly ash and desulfurized gypsum without large-sized calcining equipment and expanding the utilization approach of the solid waste material; and by adopting a non-sintering process, the ceramic aggregate and the preparation method thereof have the advantages of environmental protection effects such as energy conservation and low carbon compared with a roasting process.

The invention provides a method for separating magnesium from lithium and extracting the lithium from high magnesium-lithium ratio brine (brine from a saline lake, from underground and from an oil-gas field). The method comprises: sodium salt and potassium and magnesium mixed salt are separated from the brine by evaporation of a saltpan; after boron extraction, sodium hydroxide is used for precipitating Mg<2+> from obtained old brine, and crystallized Mg(OH)2 is obtained by modification and precipitation condition control; filtration and separation are carried out to remove the Mg(OH)2 to realize separation of magnesium and lithium; after filtered mother solution is vaporized and concentrated for 2-4 times, Na2SO4 and NaCl are separated by crystallization, and pure caustic soda can be added to form lithium carbonate from lithium; or the operation of further evaporation is carried out until Na2SO4 and NaCl are separated by multiple times of natural evaporation or forced evaporation concentration and multiple times of cooling crystallization; the operations of evaporation and concentration are carried out until LiCl saturation, and LiCl products can be prepared after the operation of cooling crystallization is carried out. Compared with the prior art for separating the magnesium from the lithium and extracting the lithium from the brine, the method obtains the crystallized Mg(OH)2 by modification and precipitation condition control, solves the existing technical problem of hard filtration of Mg(OH)2, solves the defects of high energy consumption, complex process and high cost of the existing calcination method, and solves the fundamental defects of low Li<2+> recovery ratio and complex technical process of the traditional precipitation method. The Li<2+> recovery ratio ranges from 85-93%, Mg<2+> removal ratio is more than 99.5%, and the method solves the problem of extracting Li<+> and Mg<2+> from high-magnesium and low-lithium brine with Mg<2+> / Li<+>>=20 mass ratio.

The invention discloses a preparation method of a rare-earth-based composite multi-component denitrification and dioxin removal catalyst. According to the preparation method, titanium dioxide (titanium white) and silicon powder as carriers and ammonium metatungstate, ammonium metavanadate, cerous nitrate and lanthanum nitrate as active components, the steps of mixing, kneading, molding, drying and roasting are carried out in the presence of auxiliary materials to prepare the catalyst, wherein the auxiliary materials include monoethanolamine, citric acid, ammonium hydroxide, lactic acid, stearic acid, glass fibers, macromolecular polymer fibers RP-CHOP, hydroxypropyl methyl cellulose, polyoxyethylene and water. The prepared catalyst can simultaneously decompose nitric oxides and dioxin and can improve the mercury removal efficiency of the existing smoke control device. The prepared catalyst is not only applicable to new power plants, but also suitable for the modification of a wet-method desulphurization device of an old power plant, 80 to 95 percent of HgO generated in a coal burning power plant can be oxidized to Hg<2+> by utilizing the prepared catalyst, and a majority of particle-state Hg<2+> can be removed by utilizing a dust removal device.

The invention provides a method for extracting vanadium from ferri containing vanadium bone coal oxygen pressure acid leach solution. The invention relates to a method for extracting vanadium from ferri containing vanadium bone coal oxygen pressure acid leach solution, belonging to the metallurgic-chemical technical field. The method is characterized in that according to the content of iron impurity (Fe<3+>) in leach solution and the percentage needed for completion of the reaction, inorganic salt reducing agents are added, which reduce Fe<3+> in the leach solution into Fe<2+>, and the leach solution is cooled to the room temperature, and the pH value of the leach solution is adjusted by NaOH solution, and the synergistic extraction of vanadium is made by mixing kerosene solvent of P204 and TBP. The method has the advantages of simple technical process, little reagent consumption, low disposal cost, high recovery rate of vanadium and high purity, etc., and is widely applied to the process of extracting vanadium from stone coal acid leach solution.

The invention relates to a preparation method for making unit doublet carbide codeposition fiber reinforcement composite material through chemical gas phase permeation / deposition process, wherein, codeposition unit doublet carbide is obtained inside a preformed billet body made of C fiber, boron fiber, ceramic fiber and metal fiber, etc. by use of the designability of chemical gas phase permeation / deposition process to make fiber-reinforcement unit doublet carbide composite material; the carbide is the combination of any two sorts of carbide of HfC, TaC, ZrC, NbC, WC, TiC, B4C, VC, AlC and SiC, etc. The material made through the method is characterized by high temperature resistance, wear resistance, anti scour, antioxidation, ablation resistance and excellent thermal shock resistance.

The invention discloses a low-cost back-contact cell production method suitable for mass production, which is used for producing solar cells. The low-cost back-contact cell production method suitable for mass production has the advantages that since a laser process (laser boring) is adopted, conventional unilateral diffusion is adopted, special leakage protection measures are taken around holes and other processes are consistent with the processes for producing conventional cells, the process is simple, the cost of added equipment is low and the product performance and the finished product rate are superior to the existing scheme.

The invention relates to a mill run desiliconizing method for the mixed alumyte, in particular to a mill run desiliconizing method for the mixed alumyte with the gibbsite. The invention is characterized in that: smashing the mixed alumyte, adding the water to make slurry and make the ore smash, abstracting the coarse fraction mineral and the fine fraction mineral in the products by means of a screen separation craft or a grade craft, fine grinding the coarse fraction mineral which is abstracted, then mixing the milling grinding products and the fine fraction mineral which is abstracted by means of the screen separation craft or the grade craft, and carrying through a floatation. After the invention is carried into execution, the mill run desiliconization of the mixed alumyte with the gibbsite in middle or low grade is realized; the invention has a higher coefficient of recovery under the condition of guaranteeing A / S ratio of the ore concentrate. The invention has the advantages of simple and steady technological process, strong operability, capability of enlarging the resource supply of alumyte and providing a technical support for economy when the alumyte resources are needed, and important economic meaning and a social meaning for the sustainable development of the alumina industry.

The invention discloses a method for preparing a calcium sulfate whisker through recrystallization. The method is characterized in that the method comprises the steps of (1), conducting program control on heating and dissolution courses: putting a raw material with a main ingredient of calcium sulfate into a sulphuric acid solution for stirring, heating simultaneously, heating a mixture to 60-95 DEG C at a certain rate with the adoption of the program control, dissolving for 20min-1h, (2), conducting the program control on cooling and recrystallization courses: using the program control to cool a suspension obtained by dissolution to 10-30 DEG C, ageing for 20min-2h, (3), conducting separating and washing courses: conducting solid-liquid separation on the suspension, washing a separated solid-phase product, and (4), conducting a drying course: drying the washed solid-phase product at a certain temperature, and obtaining the calcium sulphate dihydrate whisker. The calcium sulfate whisker is prepared by utilizing a recrystallization principle under an ordinary-pressure mild condition, and a relatively economical technological approach can be provided for the resource utilization of industrial by-products such as desulfurization gypsum and phosphogypsum.

The invention is a kind of capillary colloid self-organization and the manufacturing method for planar and three-dimensional colloid crystal. It has a tiny bypass and uses the capillary in the bypassto absorb, thus the colloid self-organization forms planar and three-dimensional colloid crystal structure. The tiny bypass is a thin one. It uses columniform or the rectangle section media bar and puts them between the two bottoms, forms the capillary bypass. The invention has no special request to the environment and has a strong resistance to the disturbance.

The invention discloses an enzymolysis method for simultaneously extracting fucoidin, alginic acid, mannitol and seaweed dietary fiber. The method comprises the following steps of firstly performing crushing and water adding soaking on seaweed raw materials; then, adding complex enzymes A for further composite enzymolysis; then, adding complex enzymes B for two-step composite enzymolysis; performing enzyme activity inactivation; performing solid-liquid separation; obtaining solid being seaweed dietary fiber crude products; using obtained liquid for extracting alginic acid, fucoidin and mannitol, wherein the enzymes A contain any four or more than four of cellulose, hemicellulase, pectinase, amylase, xylanase and the like; the complex enzymes B contain one or any two of alkaline protease, neutral protease, papain, trypsin, acid proteinase and pepsin. The method provided by the invention has the most obvious beneficial effect that by using the special composite enzymolysis technology, four kinds of products including fucoidin, alginic acid, mannitol and functional dietary fiber can be simultaneously extracted from seaweeds.

A preparation of chitosan oligosaccharide by degradating chitose with ozone, including steps of: adding acid solution of chitose into ozone degradation groove, adding ozone catalyst, insufflating ozone, reacting for 30-80 min at temperature of 10-100 DEG C. under agitation of high speed and irradiation of ultraviolet to get degradation solution, intercepting degradating product of chitose with degree of polymerization between 3 to 10 or 3 to 20 by membrane separation, concentrating and spray drying to obtain active chitosan oligosaccharide. The invention has advantages of simple operation, faster degradation speed, dramaticly reduced reaction cycle, and production cost is obviously reduced. Ozone is degradated while being decolored, so that no browning of chitosan oligosaccharide occurs. The content of active chitosan oligosaccharide (with degree of polymerization between 3 to 10 or 3 to 20) in the invention is not less than 90%.

The invention discloses a test method and device for seabed cable tensility torque which can use horizontal and vertical ways, characterized in that the device comprises following components: (1) a fixed clamp for clamping the seabed cable, (2) an optical cable sample for the tested seabed, (3) a measuring device for displacement, (4) a rotatable clamp with an angle sensor, (5) a stretching sensor, (6) a counter poise and counter poise bracket, (7) a stretching converter, (8) an angle converter, (9) a displacement converter , (10) a centre processor, (11) a light power meter, (12) light source. After the method respectively processes optical connection and electrical connection for the test instruments and devices and forms the integral test devices, the method opens the light source and a stretching tester to observe and record the parameters of the light declining quantity, the tensility, the flexible strain capacity, the rotating direction of the cable and the angle of the seabed cable. The advantages of this invention is taking the parameters obtained by the test as import scientific foundation for research, design, production, technique and construction and maintenance of guide of the seabed cable for the leaders and scientific stuffs developing the relevant working decision.

The invention discloses a remote sensing surveying method used for estimating the urban tree coverage rate with high precision and a remote sensing surveying system thereof. The method comprises the following steps: S110, a multispectral remote-sensing image is utilized to carry out the partition aiming at extracting crown coverage areas; S120, aiming at the image areas generated by the partition, a fuzzy classifier is built to carry out the tree coverage classification of oriented objects; S130, the precision evaluation of the classified result is carried out; and S140, the urban tree coverage rate is calculated according to the classified tree coverage area. According to the invention, the actual crown ground cover area which is accordant with each tree in an urban area is extracted from the remote sensing images with high resolution, then the total area of the tree coverage in the urban area is calculated according to the pixel ground resolution of the remote sensing images, and finally, the tree coverage rate in the urban area is obtained. Compared with a tree coverage rate calculating method applied currently, the invention has the advantages that the estimation precision is obviously improved, and the actual position of the crown layer ground coverage area of each tree can be obtained.

The invention relates to a method and system for comprehensively purifying, collecting and utilizing overpass rainwater. The system disclosed by the invention comprises a rotational flow separation module, a high-efficiency purification module and a plastic water storage module. According to the method, based on the principle of gravity rotational flow sand setting technology and absorption, filtration and purification technology, emission, collection and purification of overhead overpass rainfall runoff are realized, suspended particles and organic and inorganic pollutants are respectively eliminated efficiently; furthermore, water storage and reuse are carried out to form integrated comprehensive technology for collecting and reusing purified rainwater; multiple effects such as fast elimination of rainwater on an overpass, water-saving irrigation of a green belt below an overpass and pollution control of overpass roadway runoff can be achieved simultaneously; and the method and the system for comprehensively purifying, collecting and utilizing overpass rainwater disclosed by the invention have wide application prospect in the fields of municipal construction and non-point source pollution control.

The invention discloses a white snow-melting agent prepared by using pyroligneous liquor and a method for preparing white snow-melting agent by using pyroligneous liquor. The method comprises the following steps: distilling pyroligneous liquor under the conditions of a pressure of 0.01+ / -0.005 MPa and a temperature of 68+ / -2 DEG C to obtain a colorless pyroligneous liquor; making the distilled pyroligneous liquor, calcium carbonate and basic magnesium carbonate react for 50-60 min at a temperature of 30-35 DEG C according to a ratio of (4-6):1:1 mol to prepare a colorless CMA (Calcium Magnesium Acetate) liquid snow-melting agent liquid; spraying and drying the colorless CMA liquid snow-melting agent liquid to obtain a CMA white solid snow-melting agent. The snow-melting agent is applied to accumulated snow with excellent effect. The CMA type environment-friendly snow-melting agent is prepared from a biomass effluent, an environment-friendly type snow-melting agent which is low in cost and free from chlorine damage can be provided for road deicing and snow-melting, and the CMA is a good corrosion remover and plays a role in protecting facilities such as roads, bridge facilities, and concrete members. The pyroligneous liquor is from one of byproducts from pyrolysis of the biomass waste through destructive distillation, and is a main energy of a sustainable development energy system.

The invention discloses a method for restoring arbuscular mycorrhizal fungi of a vegetative cover in a land with discarded iron tailings of a grassland ecosystem, and relates to the technical field of ecological restoration of vegetative covers in a land with discarded metal tailings. The method for restoring arbuscular mycorrhizal fungi comprises the following steps of: (1) covering earth on iron tailings for 3 to 7 centimeters deep; (2) inoculating arbuscular mycorrhizal fungicides such as Glomus versiforme and the like at the place 0 to 3 centimeters far from the earth; (3) planting plants such as Elymus dahuricus Turcz and the like, harvesting the plants after 60-day to 120-day growth, using the plants which meet a relevant standard as feed, and centralizedly burning and landfilling the plants which do not meet the relevant standard. The method for restoring the arbuscular mycorrhizal fungi has the following advantages that: the adopted arbuscular mycorrhizal fungi symbiose with herbs easily so that the absorption and utilization of nitrogen, phosphorus and potassium are promoted, the absorption or transferring of heavy metals is reduced, the thickness of covering earth is reduced, the growth situation of plants is improved, the planting and growth of plants in iron tailings covered with earth are promoted, the method for restoring the arbuscular mycorrhizal fungi has high success rate of revegetation, simple process and lower cost, and is applicable to management of lands with discarded iron tailings of grassland ecosystems.

The invention belongs to the technical field of the mulberry seedling culturing and the orchard constructing. In spring, the sheared waste mulberry branches are used for the hard branch hotbed cottage by applying the modern agricultural technology so that the matrix components are optimized, the nutrients are diversified, the cottages can root rapidly and survive, the rooting rate / survival rate of the cottages are greatly improved, and the mulberry seedlings can be transplanted in the field to grow or construct the orchard. The method has the advantages of rapid mulberry seedling culturing and orchard constructing, low cost, high rooting rate of cottages, high survival rate of the mulberry seedlings transplanted in the field, very wide source of cottages and simple technical process and being convenient to popularize and apply.

The invention discloses a method for batch preparation of graphene quantum dots. The method is characterized by comprising the following steps: using graphite powder as a raw material; quickly obtaining large-batch unoxidized graphene quantum dots by liquid nitrogen impregnation ultralow temperature pretreatment and ultrasonic chemical stripping. According to the method disclosed by the invention, a liquid nitrogen impregnation ultralow temperature pretreatment technology is introduced and is combined with conventional ultrasonic processing, so that large-batch preparation of the graphene quantum dots is realized; according to the method, the condition that the graphene quantum dots are oxidized can be effectively avoided, and the activities such as conductivity of the graphene quantum dots is ensured to the maximum extent; in addition, by using the method, large-batch preparation of high-concentration graphene quantum dots can be realized; the method has the advantages of simple process, convenience in operation and low preparation cost.

The invention discloses a solid-liquid connecting method of aluminum materials. The solid-liquid connecting method comprises the following steps of carrying out surface zinc layer protection treatment on a to-be-connected solid-state aluminum alloy preset material; melting and refining to-be-poured aluminum alloy, and obtaining liquid-state pouring aluminum alloy; presetting the to-be-connected solid-state aluminum alloy preset material which is subjected to the surface zinc layer protection treatment in a die cavity; pouring the liquid-state pouring aluminum alloy into the die cavity, and enabling metallurgical bonding to be formed between the to-be-connected solid-state aluminum alloy preset material and the to-be-connected liquid-state pouring aluminum alloy, i.e. completing solid-liquid connection of different kinds of aluminum alloy materials. According to the solid-liquid connecting method of the aluminum materials, disclosed by the invention, a series of problems, such as oxidation, slag inclusion, air suction, hot cracking and composition segregation, which are often caused when a traditional welding method is used for connecting the aluminum alloy are solved, the difficulty that the metallurgical bonding is prevented from being formed by a surface oxidation film is overcome, the composite technological process is simple, the constraint which is limited by the appearance condition is small, the requirement on technological equipment is simple, and gas protection is not needed.

The invention relates to a method for producing ferric salt-series purifiers by recycling and comprehensive utilizing a stainless steel waste etching solution, which is developed for overcoming the defects of high production cost, halfway separation and complicated operation existing in the traditional stainless steel waste etching solution regeneration and nickel recovery technology. The method comprises the following steps of: firstly performing component analysis on the waste etching solution, additionally adding a certain amount of ferrous sulfate heptahydrate crystal according to the contents of nickel and chromium, and then oxidizing by using ozone; when Fe<2+> in a mixture is all oxidized to Fe<3+>, moving the mixture to a crystallization kettle, and adding hydrochloric acid to regulate pH value; forming hydrated sulfate and chlorate crystallized substances containing nickel and chromium ions by controlling the crystallization temperature and time, stirring speed and pH value; performing solid-liquid seperation on the crystallized substances, and then performing secondary crystallization when the contents of nickel and chromium in a filtrate are proper until the contents of the nickel and chromium in the filtrate are less than 100PPM; obtaining ferric chloride as a chemical component of the filtrate after separation, and producing other ferric salt-series purifiers by adjusting the amounts of ferrous sulfate and the hydrochloric acid.

The present invention discloses one kind of clean green fuel and its preparation process. The preparation process includes the steps of: crushing coal to average size smaller than 2 mm, adding water to form slurry, superfine treating the slurry and adding desulfurizing agent. The present invention applies superfine treating technology and separating technology in treating coal to increase the specific surface area, raise combustion efficiency and raise desulfurizing rate, so as to realize the clean efficient combustion of coal at low cost.

The invention provides a method for mineral dressing and silicon removal of bauxite, and particularly relates to a method for mineral dressing and silicon removal of diaspore type bauxite. The method comprises an ore-grinding grading process and a flotation silicon removal process, and is characterized in that: the product of ore grinding is graded for two or three times, wherein a double-layer high-frequency vibrating screen is used at the last time of grading; and among three products obtained by grading of the double-layer high-frequency vibrating screen, large-size grains are reground and re-dressed, medium-size grains are used as rough concentrates or enter the flotation system for concentration, and small-size grains enter the flotation system for flotation silicon removal. The method has the advantages of effectively solving the technical problem that the grinding machine is high in energy consumption and low in treating capacity, the problem that the grain size of the flotation materials is small and other problems, better performing flotation silicon removal of bauxite, obtaining bauxite concentrates with qualified grade, along with good process technique and economic indexes.

The invention discloses a colorless and transparent low dielectric constant polyimide film and a preparation method thereof. The polyimide film is characterized by obtaining a polyamide acid solution through polycondensation reaction between fluorinated diamine and a fluorinated dianhydride monomer and casting the polyamide acid solution to prepare the polyimide film. The polyimide film and the preparation method have the beneficial effects that the polyimide film is prepared by adopting fluorinated diamine and the dianhydride monomer and is colorless and transparent; the dielectric constant of the polyimide film is substantially reduced by introducing the fluorinated monomer; the process is simple and achieves industrial production very easily.

The invention relates to a method for removing trace thallium contained in water, relating to a method for removing the trace thallium contained in the water and aiming at solving the problem that the traditional method for removing the trace thallium contained in the water is complex in treatment technology and high in operating cost, can not reach the 'drinking water sanitary standard' and difficultly recovers and separates engineering nanometer materials after usage by removing heavy metals contained in the water by adopting the engineering nanometer materials. The method comprises the following steps: adding ferrate to the water which contains the trace thallium for reaction, and stirring for adsorption; then adding a coagulant; and finally coagulating, depositing and filtering sequentially to remove the trace thallium contained in the water. The method disclosed by the invention achieves the thallium removal efficiency more than 90%, is simple in technical process and low in operating cost, realizes the effective removal of the thallium and used for removing the trace thallium contained in the water. According to the method, the drinking water reaches the 'drinking water sanitary standard', namely the thallium is less than 0.1 microgram / L.

The present invention is the preparation process of 2D and 3D colloidal crystal. Inside the space between two parallel plates, one micro cavity system with three closed sides and one opened end is set and colloid suspension is injected into the micro cavity. Then, the opening of the micro cavity is inclined downward, so that the microballoons under gravitational force greater than buoyancy will first form one random dense arrangement on one substrate of the micro cavity. After that, in the process of drying the colloid suspension from the opening to the inside of the micro cavity or moving the liquid surface from the opening to the inside of the micro cavity, the microballoons under surface tension will be self organized to form ordered structure. The present invention has simple technological process, short preparation period and high efficiency, and can prepare great area and high quality 2D and 3D colloidal crystal in ordered structure.

The invention discloses a method for extracting quebrachitol from natural rubber whey. The method comprises the following steps: 1, boiling the whey, removing floated rubber, concentrating, removing proteins and other impurities, decoloring by active carbon, and crystallizing. The method has the advantages of simple process, low cost of above used raw material, mitigation of the sewage processing pressure of a rubber preparation factory, realization of changing of wastes into valuables, and improvement of added values of the natural rubber industry.

The invention provides a NiTi shape memory alloy with a surface injected with metallic elements and a preparation method thereof. A HfO2 / TiO2, ZrO2 / TiO2 or Nb2O5 / TiO2 nanometer composite oxide film is formed by injecting metallic elements of Hf, Zr or Nb into the surface of NiTi shape memory alloy, wherein the injection quantity of Hf, Zr or Nb is 0.5*1017-2.5*1017 ions / cm2, the thickness of the nanometer composite oxide film ranges from 60nm to 100nm, and the distribution of the Ni element is inhibited at a near surface layer ranging from 0nm to 60nm. The nanometer composite oxide film improves the corrosion and wear resistance and biocompatibility of the NiTi shape memory alloy.

The invention relates to a self-cleaning polybenzoxazine super-hydrophobic super-oleophylic net film material, preparation and application thereof in oil-water separation. The super-hydrophobic super-oleophylic net film material comprises: 1 part by weight of benzoxazine, 0.001-60 parts by weight of nanoparticles, and 1-100 parts by weight of a solvent. The preparation process consists of: adding nanoparticles into a benzoxazine solution, and mixing and dispersing the substances uniformly; putting a polymer fiber filter cloth or a metal filter screen into the blend, and preparing the self-cleaning polybenzoxazine super-hydrophobic super-oleophylic net film material by dip coating process and further thermocuring process. The invention provides the super-hydrophobic super-oleophylic net film material and preparation thereof, the net film material has the characteristics of cheap raw materials, no fluorine-containing additive, simple process, suitability for continuous industrial production, and excellent oil-water separation. The oil-water separation material is acid and alkali resistant, ultraviolet radiation resistant, and high temperature resistant, can be recycled repeatedly, and has good self-cleaning characteristic under the combined action of illumination and heating treatment.

This invention is a method about the surface modified treatment of magnesium sulfate, so it can protect and decorate the magnesium alloy. It includes degreasing, activating with acid bath, alkali bath, chemical modifying and sealing process, and it also includes water bath and processes of drying. The modified reagent includes phosphoric acid, barium hydroxide, sodium fluoride and zinc sulfate. The merits of this invention are as fellows: 1. the main treating reagent of this invention is sulfate, and it does not have chrome acid or cyanide, so it is no pollution. 2. The reagent of this invention can be reused by additional addition, so this could save the resource and decrease the cost of production. Contrasting to the anodic oxidation technology, this invention can decrease around 60.5% cost. 3. The process of this technology is simple, is easy to construct automatic production line and does not need large capital for device. 4. The chemical conversion membrane forms by this technology could improve the adhesion of the magnesium alloy and corrosion resistance. 5. This invention grasps the optimum ratio of reagent, temperature of heating and time of treatment, and it also avoids the instability of the reagent, non-homogeneous conversion membrane and is easy to slough.