40 results about "Guobiao standards" patented technology

The treatment of sea water as circulating cooling water solves the problem of corrosion and scaling of cooling water system of admiralty brass, carbon steel and other material and the problem of jamming caused by microbes and clay in sea water. The treatment method is to add corrosion inhibitor 40-50 mg, antiscaling agent 30-40 mg, oxidizing biocide 20-30 mg and non-oxidizing biocide 80-120 mg to each liter of sea water used as circulating cooling water. The treatment method coincides with relevant specification and reaches very high water saving effect.

The invention discloses a treatment method of secondary wastewater of kitchen waste. The treatment method comprises the following steps of: (1) carrying out materialization pretreatment on kitchen wastewater to remove floater, animal or vegetable butter, oil and SS (suspended matter) in the wastewater; (2) carrying out the two-stage hydrolysis acidification-IC (internal circulation) anaerobic reaction treatment and biochemical treatment of an aerobiont separation bed on the wastewater; and (3) carrying out flocculation and precipitation on the biochemically-treated wastewater to discharge, and concentrating, dewatering and drying precipitate. The wastewater discharged by using the method reaches The people's Republic of China national standard of sewage comprehensive discharge standard (third-level discharge standard); through two-stage hydrolysis acidification-IC anaerobic reaction treatment, the gross removing rate of CODcr (chemical oxygen demand) can reach more than 92%, and carbon source does not needed to be supplied in the midway of the reaction, so that the normal running of equipment can be guaranteed.

The invention relates to a method for removing heavy metals in excess sludge by bioleaching-similar Fenton oxidative coupling and belongs to the technical field of sewage and sludge treatment. The method comprises the following steps of: culturing domesticated autochthonous bioleaching bacteria serving as inoculation liquid in the sludge under the condition that enough substrate is added; adding the inoculation liquid into the excess sludge and bioleaching the sludge under the condition that oxygen exists, stirring is performed and an appropriate amount of substrate is added until the pH of the sludge is between 2 and 3; allowing H2O2 to produce strong oxidizing free radicals and the like to oxidizing the sludge under the catalytic action of Fe<2+> and Fe<3+>; adding solution of Ca(OH)2 into the treated sludge and adjusting the pH of the sludge to be between 6 and 7; and dehydrating the treated sludge by a plate and frame filter pressing or centrifugal dehydration method to obtain the dehydrated sludge of which the water content is between 65 and 75 percent. After the sludge bioleaching-similar Fenton oxidative coupling is performed, the dissolution rates of cadmium, mercury, lead, chromium, arsenic, nickel, zinc and copper in the sludge are up to 50 to 65 percent, 50 to 70 percent, 15 to 35 percent, 55 to 70 percent, 70 to 80 percent, 65 to 80 percent, 60 to 85 percent and 60 to 80 percent respectively. The heavy metal content of the sludge is lower than the requirements of The Disposal of Sludge from Municipal Wastewater Treatment Plant: Control Standards for Agricultural Use of the State Criteria of the People's Republic of China (CJT309-2009) and The Disposal of Sewage Sludge from Municipal Wastewater Treatment Plant Sludge Quality for Afforestation in Gardens or Forests (GB / T 23486-2009).

The invention provides nano epoxy high hydrogen bubble water as well as a preparation device and a preparation method thereof. A newest nano gas-liquid mixing technology is adopted. In the hydrogen water produced by the nano gas-liquid mixing technology matched with a machine for producing hydrogen by electrolyzing pure water, the ratio of hydrogen gas to water can reach 1:9. The machine for producing hydrogen by electrolyzing pure water without adding alkali is an efficient, energy-saving and environment-friendly high-tech patent product. The purity of the hydrogen gas can reach more than 99.9999% which completely conforms to the safety standard of food additive hydrogen gas in the national food safety standard of the State Standard of the People's Republic of China (GB31633-2014). The machine for producing hydrogen by electrolyzing pure water is matched with a gas-liquid mixing pump so as to meet the requirement for producing nano epoxy hydrogen-rich bubble water.

The invention provides a method for preparing hedenbergite glass ceramics by using lead slag, and belongs to the fields of environmental protection and resource recycling. According to the method, the lead slag is used as a main raw material, waste glass and coal ash are added and serve as composition adjustment raw materials, chromic oxide, nickel oxide and pyrolusite are added and serve as coloring agents, the main raw materials and the composition adjustment raw materials are respectively dried, broken and subjected to composition detection, and the main raw materials, the composition adjustment raw materials and the coloring agent are added according to a stoichiometric ratio, mixed, melted, cast, annealed, nucleated and crystallized so as to obtain the hedenbergite glass ceramics with different colors. The prepared glass ceramics meet the standards of industrial glass ceramics and building glass ceramics; and the concentration of heavy metal ions in the prepared glass ceramics is far lower than the limiting value of the leaching concentration of heavy metals, which is stated in Identification standards for hazardous wastes-Identification for extraction toxicity (GB5085.3-2007) of National Standard of the People's Republic of China. The method turns waste into wealth, is simple in technology and low in cost and solves the problem of stockpiling of industrial waste residues such as lead slag and coal ash.

The invention discloses an organic-inorganic compound sewage treatment agent and a preparation method thereof. The compound treatment agent is prepared from the following raw materials in parts by weight: 6 to 8 parts of gelatin, 9 to 14 parts of cysteine, 9 to 24 parts of thioglycolic acid, 20 to 24 parts of sodium lignosulfonate, 22 to 26 parts of carboxymethyl chitosan, 12 to 13 parts of urea,25 to 27 parts of limestone, 14 to 16 parts of sepiolite, 28 to 30 parts of bentonite, 25 to 30 parts of fly ash, 24 to 28 parts of quick lime, 13 to 15 parts of medical stone, 13 to 15 parts of aluminum sulfate, 15 to 17 parts of ferric chloride and 12 to 14 parts of polyethyleneimine xanthic acid. The compound treatment agent provided by the invention combines advantages of an inorganic mineralabsorbent and an organic biological high polymer flocculating agent; the removing rates on heavy metal, COD (Chemical Oxygen Demand), SS (Suspended Solids), TP (Total Phosphorus) and TN (Total Nitrogen) reach 95 percent or more respectively; the content of the heavy metal, the COD, the SS, the TP and the TN in treated river channel sewage meets type IV requirements in a table 1 of National Environmental Quality Standard for Surface Water of the People's Republic of China GB3838-2002.

The invention relates to the field of sewage treatment and aims to provide a spheroidal composite adsorbent for sewage treatment. The spheroidal composite adsorbent is prepared from 8-10 parts of lignin, 6-9 parts of sulfydryl modified polyacrylamide, 2-3 parts of sodium alginate, 30-40 parts of sulfydryl modified quartz sand and 20-30 parts of sepiolite. The spheroidal composite adsorbent has thefunctions of adsorbing and removing organic matter, suspended matter and heavy metals in sewage, and has the good removal effect on the heavy metals in the acidic sewage and has the integrated effectof adsorption, flocculation and sedimentation, the contents of COD, SS, lead, cadmium, copper and mercury in treated river channel sewage all reach the stipulations of national standard surface waterenvironmental quality standard GB3838-2002 of the People's Republic of China, and the removal rate of heavy metals in acid heavy-metal heavily polluted wastewater reaches 99% or above.

The invention relates to a process for extracting from virgin rubber purple twig and refining lac dye, which comprises immersing the virgin rubber with water, extracting rubber washing liquid, and filtering the rubber washing liquid through microfiltration and hyperfiltration. The process of the invention has simple technique and convenient operation, the appearance color and physicochemical index of the refined lac dye achieve the standard which is regulated by 'national standards of P.R.C- food additives namely lac dye(GB / T4571-1996)', wherein the contents of heavy metal such as plumbum, arsenic and the like greatly lower than the contents which are regulated by the national standard. The invention improves the security for eating of the lac dye, shortens the refining technique of the lac dye, improves the yield rate and pureness of the lac dye, lowers energy consumption of producton, utilizes a film refining method to refine the lac dye, avoids adding a large amount of acid and alkalic, and keeps the original chemical structure of the lac dye, and then the environmental pollution problem of the industrial production of lac is solved fundamentally.

The invention discloses a method for detecting amylose content in glutinous rice flour. The method comprises the steps of: firstly, according to Chinese national standard Determination of Amylose in Grains of Rice, Maize and Millet, selecting standard glutinous rice flour with amylose content being distributed in a gradient as control samples; soaking a to-be-detected sample in water for 3-6 hours, then fishing out the sample, draining off water, and drying the sample in a dryer until the water content becomes 12%; grinding dried glutinous rice into flour, refrigerating the flour in refrigeration equipment for 5 hours at the temperature of minus 5 DEG C, and secondarily drying the flour in the drier until the water content becomes 10%, thereby obtaining to-be-detected glutinous rice flour; sufficiently dyeing the to-be-detected glutinous rice flour and the control samples with an I2-KI solution, wherein the dyeing degrees of the different control samples change in a gradient type due to the different mylose contents; comparing the dyeing degree of the to-be-detected glutinous rice flour with the dyeing degrees of the control samples, and getting an average value if the dyeing degree of the to-be-detected glutinous rice flour is between the dyeing degrees of two control samples, thus judging the amylose content. The result detected by the method is easy to judge and the obtained information is correct and reliable.

The invention provides mineral-oil-free warming hand cream with heat sensitization. The hand cream is prepared from the following components in percentage by weight: 3 percent to 30 percent of a skin-moistening agent, 1 percent to 30 percent of a humectant, 0.1 percent to 10 percent of thickener, 0 to 5 percent of a pH (Potential of Hydrogen) regulator, 1 percent to 7 percent of an emulsifier, 0.01 percent to 1 percent of a chelating agent, 0.01 percent to 1 percent of a preservative, 0.01 percent to 20 percent of a skin conditioner, 0.01 percent to 1 percent of a heat sensitizer, 0.01 percentto 1 percent of an aromatic agent and the balance of purified water. The mineral-oil-free hand-warming cream with the heat sensitization, provided by the invention, meets the requirements in NationalStandards of the People's Republic of China QB / T 1857 skin-moistening cream. The hand cream provided by the invention does not contain mineral oil, and skin stimulation can be effectively reduced; meanwhile, the mineral-oil-free warming hand cream contains a heat sensitization component, so that a warm feeling can be brought when the hand cream is used in cold weather, and blood circulation of hands is promoted; the hand cream keeps moisture for a long term to solve the dry problem; meanwhile, the color and luster of skin are improved.

The invention provides an orange oolong tea and a processing method thereof. The orange oolong tea is prepared by the following steps of: mixing 5 to 15 percent of orange juice and the rest oolong tea water in percentage by volume; and based on the total volume of the orange juice and the oolong tea water, adding 2 to 4 grams of xylitol and 0.1 to 0.2 gram of beta-cyclodextrin into each milliliter of the mixture of the orange juice and oolong tea water to prepare the orange oolong tea. The invention optimizes a combination scheme, so the obtained orange oolong tea beverage has moist color, golden yellow and bright soup color, pure fragrance, appropriate sour and sweet degree, good mouthfeel and tea flavor, and the taste and the flavor of oolong tea are enriched; and physical and chemical analysis results show that each physical and chemical index of the product is far beyond the national standards of the People's Republic of China: the standards of GB / T 21733-2008 'tea beverage'. The preparation method is simple and practicable, is quick to operate and has a good application prospect.

The invention discloses a dewaxing and degreasing method of shellac resin. The dewaxing and degreasing method comprises the steps of: crystallizing alkaline solution with dissolved shellac resin, so that shellac wax and oil are crystallized and separated out; and carrying out solid-liquid separation and removing the shellac wax and oil, so as to obtain the dewaxed and degreased shellac resin. The dewaxing and degreasing method of the shellac resin disclosed by the invention is simple in process, and convenient to operate; the content of shellac wax in the shellac resin is obviously reduced; and the service performances of bleached lac, shellac piece and granular lac prepared from the dewaxed and degreased shellac resin accord with the state standard of the People's Republic of China of corresponding product.

The invention provides a polyvinyl chloride Grade-A flame-retardant fireproof silencing wear-resistant wood-plastic floor material which is prepared from the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 3-5 parts of melamine, 30-40 parts of wood meal, 1.1-2.2 parts of molybdenum trioxide, 8-11 parts of tetrabromobisphenol A, 0.5-1.0 part of ferrocene, 13-27 parts of hexabromocyclododecane, 2-5 parts of plasticizer, 10-22 parts of zinc borate, 2-5 parts of cosolvent, 20-40 parts of hydroxide, 0.6-1.8 parts of color master batch, 10-15 parts of flame-retardant polyether, 30-60 parts of calcium carbonate, 5-10 parts of sodium carbonate, 5-9 parts of ammonium polyphosphate, 10-20 parts of hollow glass microsphere and 5-9 parts of high-pressure polyethylene. The polyvinyl chloride Grade-A flame-retardant fireproof silencing wear-resistant wood-plastic floor material satisfies Grade A in Chinese National Standard Code for Fire Prevention in Design of Interior Decoration of Building GB5022-95.

The invention discloses a magnetic sewage treatment agent and a preparation method thereof. The magnetic sewage treatment agent is prepared from 2 to 3 percent of sodium alginate, 32 to 38 percent ofacrylic amide, 11 to 13 percent of acrylic acid, 10 to 15 percent of loaded nanometer TiO2 type fly ash, 3 to 13 percent of cyclodextrin and 14 to 20 percent of functional magnetic particles. The magnetic treatment agent uses sodium alginate and polyacrylamide high polymer materials to coat the fly ash and the magnetic materials in a chemical bonding form; the advantages of flocculating agents, adsorption agents, photocatalysts and magnetic separation technology are combined; the high separation recovery rate is realized and reaches 99 percent; a good clearing effect is achieved on organic contaminants and heavy metal contaminants in sewage; the contents of COD, SS, lead, cadmium, copper, mercury, chromium (VI) and arsenic in the treated riverway sewage reach the specification in NationalStandard For Surface Water Environmental Quality in the People's Republic of China GB3838-2002; the magnetic sewage treatment agent has wide application prospects in the sewage treatment field.

The invention provides a polyvinyl chloride Grade-A flame-retardant fireproof wear-resistant wood-plastic floor material which is prepared from the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 3-5 parts of melamine, 30-40 parts of wood meal, 1.1-2.2 parts of molybdenum trioxide, 8-11 parts of tetrabromobisphenol A, 0.5-1.0 part of ferrocene, 13-27 parts of hexabromocyclododecane, 2-5 parts of plasticizer, 10-22 parts of zinc borate, 2-5 parts of cosolvent, 20-40 parts of magnesium hydroxide, 20-40 parts of aluminum hydroxide, 10-15 parts of expandable graphite, 0.6-1.8 parts of color master batch, 10-15 parts of flame-retardant polyether, 30-60 parts of calcium carbonate, 5-10 parts of sodium carbonate, 5-9 parts of ammonium polyphosphate and 10-20 parts of hollow glass microsphere. The polyvinyl chloride Grade-A flame-retardant fireproof wear-resistant wood-plastic floor material satisfies Grade A in Chinese National Standard Code for Fire Prevention in Design of Interior Decoration of Building GB5022-95.

The invention provides a method for brazing a steel pipe and a copper pipe. The method comprises the following steps of: a, applying a layer of paste QJ102 brazing powder to the brazing point on the surface of a steel pipe, wherein the surface of the steel pipe is galvanized; and b, heating the brazing point of the steel pipe and a copper pipe according to common brazing requirements, adding copper-phosphorus brazing filler metal onto the brazing point, and naturally cooling, wherein the copper-phosphorus brazing filler metal is a copper-phosphorus brazing filler metal in the National Standards of Peoples Republic of China-copper base brazing filler metals, the method breaks the rules to braze the steel pipe and the copper pipe by adopting the copper-phosphorus brazing filler metal (BCu93P-A, BCu93P-B, BCu91PAg and BCu88PAg), and each index of the brazed product can achieve the result of brazing by adopting a silver brazing filler metal after detection and is in accordance with national standard. According to the method, the brazing cost is greatly reduced.

The invention provides a method for preparing phosphorus-potassium nitrate fertilizer by using waste water generated in the synthetic process of 2, 4, 6-trichloropyrimidine, which comprises the following steps: separating out a catalyst in a waste liquid by a reduced pressure distillation method, and acquiring calcium phosphate in a deposition mode; then respectively grinding the calcium phosphate, ammonium nitrate and potassium nitrate into fine powders, and uniformly mixing the fine powders in a certain proportion to acquire the phosphorus-potassium nitrate fertilizer through vacuum reduced pressure drying. The production ratio is 99.09-99.80 percent. The prepared phosphorus-potassium nitrate fertilizer has higher contents of total nutrients and each nutrient and low contents of free water, and each technical index is superior to the standard of the high-class product of the phosphorus-potassium nitrate fertilizer in the State Standard of the People's Republic of China (GB / T 10510-2007); meanwhile, the catalyst in the waste liquid is recovered, the phosphorus and the organic catalyst in the waste liquid can be recycled (the recovery ratio of the phosphorus in the waste water reaches 99.77-99.86 percent, and the recovery ratio of the catalyst reaches 81-89 percent), and the method has good social meanings and high economic value.

The invention discloses a drying method of bleached lac, which comprises the following steps: performing centrifugation process of washed bleached lac particles to remove moisture between lac particles, performing extrusion treatment of the lac particles under a low temperature condition to remove moisture in capillaries inside the particles so as to prepare sheet lac, performing microwave radiation drying treatment of the sheet lac in a vacuum state to remove residual capillary moisture and adsorbed moisture in the bleached lac. The method of the invention is operated and run at a low temperature; the drying working time is significantly shortened; the method is easy to operate, and has high automaticity; the prepared bleached lac has low water content; and the appearance color and physical and chemical indexes reach and exceed the refined bleached lac standards specified by PRC national standard - bleached lac [GB / T8140-2009].

The invention provides a polyvinyl chloride flame-retardant artificial leather material, which is prepared from the following raw materials in parts by weight: 60-80 parts of polyvinyl chloride, 2-4 parts of melamine, 9-15 parts of tetrabromobisphenol A, and molybdenum trioxide 1‑3 parts, 10‑15 parts of hexabromocyclododecane, 0.2‑0.7 parts of ferrocene, 15‑20 parts of zinc borate, 2.5‑6 parts of plasticizer, 6‑10 parts of expandable graphite, 2 parts of cosolvent ‑5 parts, flame retardant polyether 15‑19 parts, color masterbatch 0.6‑1.8 parts, brominated epoxy resin 7‑9 parts, ammonium polyphosphate 1‑3 parts, coupling agent 0.1‑0.3 parts. The material is environmentally friendly and energy-saving, non-absorbent, non-combustible, wear-resistant, simple process, good dimensional stability, good compression creep resistance, and has reached the A level of GB 50222-95 "National Standard of the People's Republic of China for Building Interior Decoration Design Fire Protection Code" Fire standards.

The present invention relates to a treatment method by taking seawater as coal gasification cooling water. The treatment method comprises: seawater pretreatment and seawater circulation; when the seawater is circulated as circulating cooling water, adding 40-50 mg of a corrosion inhibitor, 30-40 mg of a scale inhibitor, 20-30 mg of oxidizing biocides, and 80-120 mg of non-oxidizing biocides in per liter of the seawater. According to the technical solution of water treatment provided by the present invention, the concentration factor can be controlled between 1.5-2.0. The corrosion rate of carbon-steel is less than 0.125 mm / a, the corrosion rate of copper, stainless steel is less than 0.009 mm / a, the biological slime is less than 4.0 mL / m3, a total number of heterotrophic bacterium is less than 5.0x105 / mL, and the fouling thermal resistance is less than 3.44x10-4m3.k / w. The treatment method meets the provision of (People's Republic of China national standard industrial circulating cooling water treatment design specifications) GB50050-95, water saving reaches 97% with respect to once-through cooling.

The invention discloses a treatment method of secondary wastewater of kitchen waste. The treatment method comprises the following steps of: (1) carrying out materialization pretreatment on kitchen wastewater to remove floater, animal or vegetable butter, oil and SS (suspended matter) in the wastewater; (2) carrying out the two-stage hydrolysis acidification-IC (internal circulation) anaerobic reaction treatment and biochemical treatment of an aerobiont separation bed on the wastewater; and (3) carrying out flocculation and precipitation on the biochemically-treated wastewater to discharge, and concentrating, dewatering and drying precipitate. The wastewater discharged by using the method reaches The people's Republic of China national standard of sewage comprehensive discharge standard (third-level discharge standard); through two-stage hydrolysis acidification-IC anaerobic reaction treatment, the gross removing rate of CODcr (chemical oxygen demand) can reach more than 92%, and carbon source does not needed to be supplied in the midway of the reaction, so that the normal running of equipment can be guaranteed.

The invention discloses Physalis pubescens baking-tolerant fruit cake and application thereof in pastry. The Physalis pubescens baking-tolerant fruit cake is made with, by weight, 90-110 parts of Physalis pubescens fruit, 0-50 parts of white granulated sugar, 0-50 parts of malt syrup, 0-5 parts of citric acid, 0-5 parts of tartaric acid, 0-5 parts of mannitol, and 0.3-30 parts of composite gel. Interms of the application of the Physalis pubescens baking-tolerant fruit cake in pastry, the Physalis pubescens baking-tolerant fruit cake may be consumed as fruit cake or baking-tolerant filling foruse in pastry described in State Standard of the People's Republic of China GB / T 20977-2007. The Physalis pubescens baking-tolerant fruit cake and the application thereof have the advantages that thePhysalis pubescens baking-tolerant fruit cake retains all nutrients and unique flavor and taste of Physalis pubescens fruit, has no pigment, is golden yellow, chewy and transparent, and is rarely damped by moisture; the Physalis pubescens baking-tolerant fruit cake may be baked with pastry foods, never runs as a fluid or dehydrates, and can retain the unique flavor and taste of Physalis pubescensfruit.

The invention provides a nano-reoxidized high-hydrogen bubble water, a preparation device and a preparation method thereof. Using the latest nano gas-liquid mixing technology. Through the nano-gas-liquid mixing technology, combined with the hydrogen generator of pure water electrolysis, the hydrogen water produced by this method can reach a concentration of 1:9 in the ratio of hydrogen to water. And electrolytic pure water (no alkali added) hydrogen generator, high-efficiency, energy-saving, environmentally friendly high-tech patented products. Among them, the purity of hydrogen can reach more than 99.9999%, which fully complies with the national standard of the People's Republic of China (GB31633-2014) food safety national standard food additive hydrogen safety standard. The electrolytic pure water hydrogen generator is equipped with a gas-liquid mixing pump to meet the needs of making nano-reoxidized hydrogen-rich sparkling water.

The invention discloses a dewaxing and degreasing method of shellac resin. The dewaxing and degreasing method comprises the steps of: crystallizing alkaline solution with dissolved shellac resin, so that shellac wax and oil are crystallized and separated out; and carrying out solid-liquid separation and removing the shellac wax and oil, so as to obtain the dewaxed and degreased shellac resin. The dewaxing and degreasing method of the shellac resin disclosed by the invention is simple in process, and convenient to operate; the content of shellac wax in the shellac resin is obviously reduced; and the service performances of bleached lac, shellac piece and granular lac prepared from the dewaxed and degreased shellac resin accord with the state standard of the People's Republic of China of corresponding product.

The invention discloses a method for extracting laccaic acid. The method comprises the steps of carrying out salt-out treatment, sedimentation treatment and acid treatment on sticklac aqueous alkali sequentially. The method disclosed by the invention is simple in process and convenient to operate; appearance, color, and physical and chemical indicators of the lac red pigment can reach the standard stated by 'the state standard of the People's Republic of China-food additive lac red pigment [GB4571-1996]'; the yield of the laccaic acid and the purity of the lac red pigment are improved; the production period is reduced; the resources are comprehensively utilized, and the problem of environmental pollution in industrial production of lac is fundamentally solved.

The invention belongs to the field of medical instruments, and particularly relates to a novel dripping core for children. The novel dripping core can be guaranteed to accord with the State Standard of the People's Republic of China, complex structures and various processes are removed, and risks are lowered. The novel dripping core for the children is composed of a liquid inlet, a liquid outlet and a dripping chamber cover. The novel dripping core for the children is formed in a one-time injection molding mode through an injection molding machine. Compared with the prior art, the novel dripping core for the children has the advantages that the appearance of products is attractive, the products accord with the State Standard of the People's Republic of China, the process design is simple and convenient, safety and sanitation are achieved, man-made pollution is reduced, the degree of automation is high, efficiency is high, the risk is small, operation is smooth, and manpower and material resources are saved.

The invention discloses a drying method of bleached lac, which comprises the following steps: performing centrifugation process of washed bleached lac particles to remove moisture between lac particles, performing extrusion treatment of the lac particles under a low temperature condition to remove moisture in capillaries inside the particles so as to prepare sheet lac, performing microwave radiation drying treatment of the sheet lac in a vacuum state to remove residual capillary moisture and adsorbed moisture in the bleached lac. The method of the invention is operated and run at a low temperature; the drying working time is significantly shortened; the method is easy to operate, and has high automaticity; the prepared bleached lac has low water content; and the appearance color and physical and chemical indexes reach and exceed the refined bleached lac standards specified by PRC national standard - bleached lac [GB / T8140-2009].