236results about How to "Less investment in production" patented technology

The invention discloses a compound microbial fertilizer, comprising the following raw materials in parts by weight: 40-50 parts of crop straws, 50-60 parts of swine wastes, 20-24 parts of bean pulp, 12-16 parts of egg shells, 10-15 parts of vinasse, 20-25 parts of attapulgite, 18-22 parts of medical stones, 6-8 parts of schaumgyps, 10-12 parts of humus, 4-5 parts of lupulus, 5-6 parts of sophora alopecuroide, 3-4 parts of radix isatidis, 4-6 parts of sweet wormwood, 1-2 parts of EM fungicide and a proper amount of water. According to the compound microbial fertilizer disclosed by the invention, agricultural and sideline products such as the crop straws, the swine wastes, the bean pulp and the like are taken as main raw materials, so that the compound microbial fertilizer not only is available in materials, low in price and cost, and abundant in nutrient, but also can improve the soil structure; the added vinasse contains a plurality of organic compounds, vitamins B and cellulose, also contains abundant crude proteins and crude fat, can be used as an energy source fertilizer, and assisted with multifunctional natural raw materials with abundant nutrients, such as the attapulgite, the medical stones and the like, so that the compound microbial fertilizer has the advantages that the water-retaining property, the adsorbability and the like of the soil are increased. By adopting the fertilizer disclosed by the invention, resources are fully utilized, productive investment is reduced, the pollution caused by a chemical fertilizer is reduced, and the compound microbial fertilizer has certain environmental and economic benefits.

The invention discloses compound bacteria for organic refuse deodorization and reduction and a preparation method thereof. The compound bacteria are mainly prepared by mixing the following raw materials in parts by weight: 10-20 parts of bacillus subtilis, 10-25 parts of bacillus licheniformis, 10-25 parts of saccharomyces cerevisiae, 5-15 parts of nitrobacteria, 8-20 parts of lactobacillus plantarum, 10-20 parts of thiobacillus denitrificans, 15-30 parts of streptomycete and 10-25 parts of trichoderma viride. The preparation method comprises the following steps: respectively inoculating each strain into a shake flask filled with a culture medium for activating and culturing, inoculating the cultured strains into a fermentation tank for performing fermentation and enlarged cultivation, dehydrating and drying various single strains obtained by enlarged cultivation to prepare hypopus microbial dried powder; and mixing to obtain the compound bacteria for organic refuse deodorization and reduction. The compound bacteria disclosed by the invention are used for organic refuse deodorization and reduction; and compared with the prior art, the compound bacteria have the advantages that the production investment is low, the production cost is low, the compound bacteria are pure green and environment-friendly, high in treatment effect, wide in adaptability and convenient to use, and the wastes can be changed into valuable materials.

The invention relates to a chemical foaming cement building material prepared by utilizing light particles and a preparation method of the cement building material. According to the chemical foaming cement building material, light particles, cement, coal ash, a foam stabilizer, fibers, a foaming agent, a gauging water, silicon powder and slag powder are used as raw materials; and three sets of foaming systems are adopted, that is to say, three foaming systems of quite stable light particle pre- foaming, physical foaming generated in a stirring process and cement chemical foaming with poor stability are combined, so that the foam breaking rate and the film collapse rate of the chemical foaming cement are greatly reduced. The chemical foaming cement building material has a more excellent insulating performance compared with independent chemical foaming cement, meanwhile, the application prospect of the light particles is expanded, and the pollution problem caused by partial industrial waste light particles is solved.

The invention relates to a preparation method of phenolic resin combined honeycomb activated carbon, which can be used for preparing the honeycomb activated carbon by the steps of: mixing dry powder, preparing plastic pug by mixing and kneading through a wet method, vacuum pugging, extrusion molding, drying, curing treatment and secondary heat treatment. Besides the function of bonding and improving the mechanical strength of the activated carbon, the phenolic resin also remarkably improves the heat-resisting property and water resistance of the honeycomb activated carbon; and furthermore, the honeycomb activated carbon is added with porous mineral, thus better effectively improving the mechanical strength and the specific surface area of the honeycomb activated carbon. The preparation method has lower heat treatment temperature and low production energy consumption, and effectively reduces the production cost; and the preparation technique and equipment thereof are simple, and the production investment is lower, so that the cost is further reduced.

The invention relates to a pipe-bundle-builtin isothermal-shift reactor. According to the pipe-bundle-builtin isothermal-shift reactor, axial annular pipe bundles, which are builtin and are uniformly distributed in a catalyst bed layer along circumferential direction, are adopted to shift out heat of reaction, so as to realize isothermal shift; and a central pipe bundle which is built in a central pipe is adopted to preheat raw material gas entering the reactor, so as to realize the builtin of a gas-gas heat exchanger. The isothermal-shift reactor comprises a pressure-bearing shell, a catalyst basket, the axial annular pipe bundles, the central pipe and the central pipe bundle; and the axial annular pipe bundles consist of upper and lower annular pipe boxes, upper and lower annular pipe sheets and heat exchange tubes. According to the pipe-bundle-builtin isothermal-shift reactor, due to builtin pipe bundles, the manufacturing cost of equipment is effectively reduced; due to an end-part bent structure for the heat exchange tubes, the size of the pipe sheets is effectively reduced; due to a heat insulating layer laid between the pipe sheets and the high-temperature catalyst bed layer, the contact between pipe end weld spots and a bed layer high-temperature area is effectively isolated, the probability of leakage is lowered, and the reliability of equipment is improved; and the pipe-bundle-builtin isothermal-shift reactor is compact in structure, low in manufacturing cost, relatively easy in maintenance, high in reliability, complete in function and high in applicability.

The present invention relates to a orlon surface grafting protein modified fibre and manufacturing method. It consists of orlon and protein, featuring that: skin core layer structure surface layer being vegetable protein grafting cover layer, core being orlon fiber, protein cover layer occupying 1-20 per cent of fiber total mass, core orlon occupying 80-90 per cent. Said manufacturing method is firstly to make orlon fiber surface hydrolysis into fiber containing carboxylic acid base group, then reaction with thionyl chloride, grafting with protein, to obtain surface covering protein layered fiber. The present invention made modified fibre surface consists of protein molecule having preferable human body affinity, hygroscopicity and antistatic property.

The invention discloses pig-chicken excrement fermenting compound bacteria, a preparation method and a method of utilizing the compound bacteria to ferment and prepare an organic fertilizer. The fermenting compound bacteria comprise the following raw material bacteria: bacillus subtilis, bacillus licheniformis, bacillus coagulans, bacillus megatherium and trichoderma viride. The method for preparing the organic fertilizer comprises the following steps: mixing pig-chicken excrement with crushed straws, adding the fermenting compound bacteria to the mixture according to a dosage of 1-2 Kg per ton, mixing uniformly, the moisture being 50-65 wt%, stacking the mixed raw materials, keeping the temperature at 55-65 DEG C to conduct fermentation, two days after the fermentation, turning the stacked materials for the first time, and then turning the materials once every one or two days, keeping the moisture at 50-65 wt% during the fermentation phase, and after fermentation, obtaining the organic fertilizer with a moisture content of 20-30 wt%. The pig-chicken excrement fermenting compound bacteria disclosed by the invention can be used for fermenting the pig and chicken excrement; compared to the prior art, the method for preparing the organic fertilizer is low in productive investment and production cost, convenient to use, free of odor, and good in the fermentation and decomposing effect.

The invention discloses composite bacteria for removing oil from kitchen waste and a preparation method for the composite bacteria. The preparation method comprises the following steps of: performing high-density culture on strains of trichoderma viride, bacillus subtilis, black rhizopus, photosynthetic bacteria, candida lipolytica, bacillus licheniformis, nitrosomonas europaea and nitrobacter winogradskyi respectively to obtain microbial dry hypopus powder; and mixing 15 to 20 weight parts of trichoderma viride, 10 to 15 weight parts of bacillus subtilis, 25 to 40 weight parts of black rhizopus, 5 to 10 weight parts of photosynthetic bacteria, 5 to 10 weight parts of candida lipolytica, 10 to 15 weight parts of bacillus licheniformis, 5 to 15 weight parts of nitrosomonas europaea and 5 to 15 weight parts of nitrobacter winogradskyi to obtain the composite bacteria for removing the oil from the kitchen waste. The composite bacteria can quickly decompose lipid ingredients in the kitchen waste when used for treating the kitchen waste; and compared with the prior art, the method has the advantages that: the production investment and the production cost are low, and the method is convenient to use.

The invention discloses a microbial sludge deodorizer and a preparation method thereof. The preparation method comprises the following steps: conducting high-density culture on strains of streptococcus thermophilus, bacillus subtilis, aspergillus oryzae, photosynthetic bacteria, saccharomyces cerevisiae, lactobacillus casei and pseudomonas putida; dehydrating and drying the various single strains which are subjected to high-density culture, so that hypopus microbial dry powder is prepared; and mixing the streptococcus thermophilus, the bacillus subtilis, the aspergillus oryzae, the photosynthetic bacteria, the saccharomyces cerevisiae, the lactobacillus casei and the pseudomonas putida according to weight ratio of 10-20 parts of the streptococcus thermophilus, 10-15 parts of the bacillus subtilis, 20-30 parts of the aspergillus oryzae, 10-15 parts of the photosynthetic bacteria, 10-20 parts of the saccharomyces cerevisiae, 10-15 parts of the lactobacillus casei and 10-20 parts of the pseudomonas putida, so that the microbial sludge deodorizer is obtained. The microbial sludge deodorizer provided by the invention is applicable to garbage deodorization; and in comparison with the prior art, the microbial sludge deodorizer is low in production investment, low in production cost and convenient to use, and moreover, the microbial sludge deodorizer is good in deodorizing effect.

The invention relates to an aluminum dioxide substrate biological active ceramic composite material with better mechanical properties and biological activity, belonging to the technical field of bioceramic material, which contains 80-99% of aluminum dioxide and 1-20% of diopside, referring to mass percentage. The preparation method comprises using aluminum dioxide balls to ball grind mixed raw materials, screening the powder material via a screen of 100 meshes to prepare mixed powder, arranging the mixed powder into a graphite mould to be died and shaped, thermally pressing and sintering in nitrogen gas or argon gas, while the sintering temperature is 1400-1500DEG C, sintering pressure is 25-30MPa, keeping the temperature and pressure for 30-40min. Tests prove that the sample immersed in simulated body fluid has much carbonate hydroxyapatite sediment generated at surface and the composite material has better biological activity. The composite material has simple preparation, low material cost, low production investment and wide application for the preparation of artificial bone.

A nutritive cordyceps additive of forage for promoting growth of fowls and animals, and improving the taste of egg and meat is prepared from Paecilomyces Guni, through slant culture, liquid seed culture, liquid fermenting, culturing in solid medium, etc.

The invention relates to the cable manufacturing field and discloses a production method and products of a flexible cable for wind power generation. The production method of the flexible cable for the wind power generation comprises working procedures of selecting materials, wire drawing, conductor stranding, insulating layer extruding, irradiation crosslinking machining, insulating layer sparks testing electric, insulating wire core cabling, filling and belting, outer sheath extruding and finished product inspection. The emphasis of processing steps is the irradiation crosslinking machining, the insulating layer sparks testing electric and the like. The irradiation crosslinking machining includes that an irradiation crosslinking technology of an electron accelerator is utilized to perform machining on an insulating wire core; the irradiation energy is 1.8 MeV, the beam current is from 8 mA - 10 mA, and the irradiation dose is controlled between 100 kGy to 120 kGy; and elongation of an ethylene-propylene elastomer under a thermal elongation test load is controlled between 80 to 120% after irradiation due to the fact that irradiation crosslinking enables the ethylene-propylene elastomer to be modified. Compared with material modification by utilizing the traditional continuous vulcanization technology, the production method of the flexible cable for the wind power generation has the advantages of saving raw materials, being environment friendly and saving the energy and the products of the flexible cable for the wind power generation have the advantages of not needing to arrange an isolated layer between a conductor and an insulating layer and being resistant to the low temperature and distortion.

The invention provides an assembly type overhead ground system for a bathroom. The system comprises a plate load-bearing structure (1), a waterproof base plate (2) laid on the plate load-bearing structure (1), a decorative ground layer (3) laid on the waterproof base plate (2) and a decorative surface layer combination layer (4) between the waterproof base plate (2) and the decorative ground layer (3). The plate load-bearing structure (1), the waterproof base plate (2), the decorative ground layer (3) and height-adjustable resin bolts (13) are mutually separated and assembled separately. By comparison with existing integrated bathroom techniques, the plane size the bathroom adopting the assembly type overhead ground system adapts to changes of plane shapes of the bathroom, the use area of the bathroom cannot be wasted, the decorative ground layer can be changed at will, reliable mounting of a drainage system on the same layer is realized, manufacturing of the base plate does not require a special shaping steel mold, and the investments for plant construction and production are substantially reduced.

A technology for producing prestressed concrete sleepers by long table method includes sequentially arranging steel moulds, installing bottom stopper, coating the isolating agent, locating prestressed bars, installing central and top stoppers, stretching prestressed bars, anchoring, installing hoops, spiral bars and preburied parts, stirring and pouring concrete, vibrating, removing stoppers, cutting the auxiliary bars, and demoulding. Its advantages are low energy consumption and cost, and high quality of product.

Disclosed is an earth-free cultivating method for Chinese toon seedling which comprises, carrying out seed presoaking at 20-25 deg. C and relative humidity of 60-905, non-soil germination hastening and growth phase. The invention can be applied for providing Chinese toon sprouts during each seasons of the year.

The invention provides a magnetic compatible microsphere for purifying thrombin and a preparation method and application thereof. The magnetic compatible microsphere for purifying the thrombin comprises a magnetic core, a polymer enwrapping material enwrapped outside the magnetic core, and a ligand coupled with the polymer enwrapping material. The magnetic affinity microsphere is characterized in that the ligand can be specifically compatible with the thrombin.

The present invention discloses a composite type of slow-release fertilizer with double control and its method for making. The said composite type of slow-release fertilizer with double control which comprises fertilizing materials of nitrogen, phosphor and kalium, cementing and bonding materials of agenthumic acid in weathered coal and clad materials is obtained by passing a screen of 60-70 meshes, mixing, pelleting, drying, bolting and cladding the said meterials. The invention adopts a measure of slow-release fertilizer wrapping slow-release fertilizer, enhances the slow-release effect and the availability ratio (10-15 %) of the fertilizer, releases slowly according to the nutrient need for the crops, simplifies the cropping agro-operation and derates the secondary environmental pollution, so it is an organic and inorganic composite type of slow-release fertilizer with multicomponent and multiple function; it is characterized in that it is of easy making technology and operation, low productive investment and cost, broad sources for stocks, high mechanical strength(>=12 N) of particles of fertilizer, no slaking, convenient transport and use, so its application prospect is broad in the production.

The invention discloses a method for preparing titanium based spherical powder with reduced particle size through gas atomization. The method comprises steps as follows: step one, a titanium based raw material and a tin material are placed in a smelting crucible, and the smelting crucible is put in a smelting chamber of a vacuum induction melting gas atomization equipment for vacuum induction melting; step two, after the titanium based raw material and the tin material are melted through vacuum induction melting, argon is introduced for protection, a graphite diversion pipe located at the bottom of the smelting crucible is heated, a melted liquid produced after melting of the titanium based raw material and the tin material freely falls into an atomization chamber through the graphite diversion pipe and subjected to vacuum induction melting gas atomization treatment, atomized powder is obtained, and titanium based spherical powder is obtained from a collecting tank. According to the method, tin is introduced into the titanium raw material or a titanium alloy raw material for reducing viscosity of the melted liquid obtained after smelting, so that the raw materials are easy to break during gas atomization, the particle size of the prepared powder becomes small, wherein the yield of the powder with the particle size smaller than 45 mu m in the titanium based spherical powder is not lower than 28%, pores in the powder are reduced, and the amount of hollow powder is reduced.

A process for producing square quartz powder from natural quartz powder is carried out by washing natural quartz powder, filtering, dewatering for filtrate, drying, baking and dispersing into powder or dewatering and drying, adding into binder to make into block or honey-comb natural quartz, putting powdered, block or honey-comb natural quartz into high-temperature furnace of 1380-1600 deg. C, keeping temperature for 1-10 hrs, forge firing, cooling, dispersing, milling, magnetic separating, dry blowing and grading. It costs low and has more yield, better whiteness, and higher conversion and less iron and aluminum elements. It can be used as coating, filter acids of insulating material, ceramic and pesticide, filling additives of glass and plastic and sanding and polishing materials of precision casting and chip.

The invention relates to a dip dyeing type paper dyeing method. The method comprises the following steps of: unreeling winding drum base paper by using a double-station paper unreeling frame; drawing the unreeled paper into a dye tank by using a drawing roller, dipping the paper in a dye in the dye tank for dyeing by using a plurality of drawing rollers of which the angles can be adjusted in the dye tank, modifying the paper dyed in the dye tank by using an arc roller, and clearing the redundant dye by using a squeeze roller; through the arc roller, drying the flattened paper by a dryer; sizing the dried paper to achieve a color fixing effect; drying the sized paper by a dryer; calendering the sized and dried paper; and reeling the calendered paper by a paper reeling machine. By the method, a small amount of water is used, the pollution is avoided, a sewage treatment device is not required to be built, Teflon drying cylinders are adopted, large boiler equipment and the like are not required to be built, the zero emission is realized, a small amount of wastewater can be recycled, and the cost is saved.

The invention discloses a high-strength non-evaporating brick and a preparation method thereof, belonging to the technical field of building materials. The non-evaporating brick comprises the following components in percentage by weight: 30-45 unground grain slag, 30-45 heavy slag, 10-20 fly ash, 2-5 industrial by-product gypsum, 1-5 activity excitant and 5-14 water. The preparation method of thehigh-strength non-evaporating brick is simple, has low production cost and produces non-evaporating bricks with strong frost-resistant performance, low drying shrinkage value and high strength over MU15.

The invention relates to a Paecilomyces militaris Liang sp.nov. fermented feed additive as well as preparation and application thereof. The fermented feed additive is a fermented product of Paecilomyces militaris Liang sp.nov. The invention also further discloses preparation and application of the Paecilomyces militaris Liang sp.nov. fermented feed additive. The preparation process of the feed additive is simple in flow, has inexpensive and easily available raw materials, and contains rich adenosine, cordycepic acid and polysaccharide; although the addition amount in mixed feed is extremely low, the Paecilomyces militaris Liang sp.nov. fermented feed additive has fully significant effects that: the feed utilization rate can be improved, the feed palatability is improved, the growth development of livestock and poultry are accelerated, the quality of feed livestock and poultry product is improved, and the feed resources are reasonably utilized; and the feed additive can also improve survival rate and lower the breeding cost by enhancing animal immunoregulation.

The invention belongs to the technical field of electrolytic aluminum solid waste resource treatment, and particularly discloses a solid waste recycling treatment system and method for an aluminum electrolysis cell. The system comprises a crushing unit, a wet grinding device, an alkaline leaching tank, a flotation tank, a filter 1, an acid leaching tank, a filter 2, a neutralizing tank, a buffer tank and an exhaust gas treatment system. The invention further provides a method for treating the solid waste of the aluminum electrolysis cell by utilizing the treatment system, which comprises the following steps of crushing, wet grinding, alkaline leaching, floatation, acid leaching, neutralization, purification. According to the system and method, the aluminum electrolysis cell waste tank liner, the waste cathode carbon block and the anode carbon slag can be efficiently treated and finally obtain a carbon powder with high purity, a cryolite, a regenerated silica sand and a sodium sulfate products, the cyanide and the waste gas are subjected to harmless treatment in the treatment process, no waste water is discharged, and the harmless resource reutilization of the solid waste of the aluminum electrolysis cell is really realized.

The invention discloses an andrographis paniculata hand sanitizer and a preparation method thereof. The andrographis paniculata hand sanitizer has a formula comprising the following raw materials in parts by weight: 0.3 to 3 parts of andrographis paniculata extract, 20 to 50 parts of surface, 1 to 10 parts of propylene glycol, 8 to 15 parts of glycerinum, 1 to 5 parts of essence, 2 to 5 parts of sodium chloride, and 40 to 60 parts of water. According to the andrographis paniculata hand sanitizer, propylene glycol and glycerinum are used together in a certain proportion in the formula, so that the andrographis paniculata extract in the formula can be dissolved fully, and the stability of the hand sanitizer can be kept at a low temperature. The result of an in-vitro drug sensitive test shows that the andrographis paniculata hand sanitizer has a good antibacterial effect.

The present invention relates to packing and building material, and is especially packaging paper board producing process and apparatus. The packaging paper board is corrugated paper board and its production process includes the following steps: preparing paper pulp, forming the pulp in the surface of the forming device, continuous vacuum suction pumping to dewater, drying, setting and final adhering the facing layer. The corrugated paper board has high strength, and the production process includes papermaking and forming paper board. The product is used in packing, as building material, etc.

The invention discloses a method for producing composite baste through mixed solid state fermentation and belongs to the field of biotechnology and biological engineering. Antarctic krill is used as raw materials, Aspergillus oryzae CICC 2247, aspergillus niger CICC 40384 and aspergillus oryzae are respectively subjected to inclined plane culture, triangular flask amplification culture and yeast box amplification culture, then, yeast seeds are subjected to co-culture to obtain production yeast materials, next, common salt water, barley roots and rosin active yeasts are added for composite fermentation, and products are obtained through post treatment. The produced composite baste has the advantages that the shape is round and full, the color is brownish red, the sauce fragrance is intense, the shrimp fresh flavor is obvious, the fresh fragrance is intense and permanent, the total amino acid is 8550 to 8600 mg / 100g, the necessary amino acid is 3200 to 3250mg / 100g, the taurine is 450 to480 mg / 100g, and the flavor nucleotides is 45 to 50mg / 100g.

The invention discloses a production method of a heat-insulating flame-retarding pulverized fuel ash decorative plate. The production method includes the steps of A1. surface modification of pulverized fuel ash; A2. preparation of epoxy resin glue solution; and A3. forming of the decorative plate. Due to the development and utilization of the colorful decorative plate, can effectively utilize waste residues can be effectively utilized, so that waste can be changed into wealth, and the development cost is low; the pulverized fuel ash used for development of the colorful decorative plate has high additional value compared with the pulverized fuel gash applied to roadway pavement, building block production, and cement production; the colorful decorative plate has the characteristics of good heat insulating, waterproof and flame-retarding performances, porousness, light weight, high strength, good toughness, attractive appearance, and easiness in coloring and the like, and can be used for the fields such as interior wall decoration, soundproof and heat-insulating layers of walls. Besides, compared with the conventional similar products, the colorful decorative plate has the advantages of wide raw material source and low production cost. The production technology of the colorful decorative plate has low requirement on production condition, the technological operation is simple, the production investment is low and the effect is remarkable, therefore, the production technology is suitable for production of medium-sized and small enterprises, which is also a precondition that the technology is popularized and applied.

The present invention relates to a comprehensive treatment method of a coking desulfurization waste liquid. The comprehensive treatment method comprises: (1) placing a desulfurization waste liquid into an aeration tank, and adding active carbon; (2) introducing hot wind to the aeration tank; (3) carrying out a decolorizing treatment for 12-16 h, pumping the treatment liquid to a plate-and-frame filter press to carry out pressure filtration, and conveying the filtrate to a decolorizing tank to carry out storage and material preparing; (4) after completing the material preparing, pumping to a vacuum concentration system, and carrying out vacuum concentration to achieve a concentrated solution; (5) pumping into a crystallizer, indirectly cooling with circulating water, and adjusting the specific gravity of the concentrated solution; (6) pumping to the plate-and-frame filter press, and filtering; (7) indirectly cooling with circulating water in the crystallizer, precipitating the ammonium thiocyanate crystal, and carrying out separation collection on the ammonium thiocyanate; and (8) refining the crude ammonium sulfate to obtain the finished product ammonium sulfate. According to the present invention, the treatment process is simple, the produced ammonium sulfate and the produced ammonium thiocyanate meet the regulations of the related products and can be directly sell, and the secondary pollution is avoided.

The invention discloses a nanometer TiO2 film taking expanded perlite as a carrier and a preparation method of the film. Anatase type TiO2 particles with the average particle size of 10-14 nm in the film are uniformly and densely distributed on the surface of the laminar expanded perlite without accumulation or agglomeration to form the nanometer TiO2 film which has a good loading effect, and is high in photocatalysis performance and convenient to recycle. The preparation method comprises the following steps: with TiOSO4 as a titanium source and urea as a precipitant, mixing the expanded perlite with a 0.1-0.2mol / L TiOSO4 solution according to the solid-to-liquid ratio of 1:(15-25) and adding the urea, wherein the mole ratio of TiOSO4 to the added urea is 1:(1.5-2); fully and uniformly stirring and heating at the temperature of 70-85 DEG C for 1-3 hours; carrying out a hydrolytic precipitation reaction; filtering and drying the precipitate product; and finally, calcining at the temperature of 450-650 DEG C for 1-3 hours. The preparation method has the advantages that the raw materials are readily available and low in price, the process flow is simple, special equipment is not needed, the productive investment is little and the industrial production is easily realized.