98 results about "Potassium nitrite" patented technology

The invention relates to a gas self-production system used for plug removal and energy increase of an oil-water well and an application method thereof. The gas self-production system comprises, by weight, 3-10% of urea, 5-25% of a nitrite, 5-25% of an activator and 40-85% of water. The nitrite is one of sodium nitrite, ammonium nitrite and potassium nitrite. The activator is one of methyl formate, ammonium amidosulfonate, ammonium-monochloracetat, hexamethylenetetramine and formaldehyde. When the gas self-production system is used, the above materials are mixed at ambient temperature under ambient pressure, and injected into oil-bearing strata having a temperature higher than 50 DEG C, so as to remove plug, increase energy and increase enhance rate. The gas self-production system can be applied for plug removal and energy increasing of low-pressure low-energy wells in an oil field scattered reserve unit.

The invention belongs to the technical field of corrosion prevention of aluminum alloy. An aluminum alloy corrosion inhibitor is characterized in that: one gram of the aluminum alloy corrosion inhibitor consists of 0.05 to 0.10 microgram of potassium nitrite, 1.0 to 4.0 micrograms of calcium gluconate, 0.05 to 0.2 microgram of mercaptobenzothiazole, 0.05 to 0.2 microgram of borate and 0.05 to 0.10 microgram of hexadecane amine. The aluminum alloy corrosion inhibitor formed according to the ratio is economic, effective, low in toxicity and high in applicability, protects the original process flow from being damaged, and is the saline medium aluminum alloy corrosion inhibitor without additional equipment.

The invention provides a preparation method of 2,5-furandicarboxylic acid. The preparation method comprises the following steps: A), with non-grain biomass as a raw material, preparing furfural; B), oxidizing the furfural to obtain furoic acid; C), performing an addition reaction on the furoic acid and carbon dioxide under the action of a catalyst to obtain the 2,5-furandicarboxylic acid, whereinthe catalyst is one or more of potassium carbonate, sodium oxalate, sodium nitrate, potassium nitrate, sodium nitrite, potassium nitrite, potassium acetate, sodium acetate, potassium formate, sodium formate, sodium hydrogen carbonate, potassium hydrogen carbonate, sodium hydroxide and potassium hydroxide. The furfural is prepared from the non-grain biomass as the raw material, so that the raw material cost is low; the furoic acid reacts with the carbon dioxide under the action of the specific catalyst to obtain the 2,5-furandicarboxylic acid; the catalyst is low in price; the used carbon dioxide is environment-friendly; by the preparation method, the yield is high.

In this invention new chemical reactions, new chemical processes are established, and these chemical reactions and chemical processes can be used with the system designed to produce nitrogen dioxide, nitric oxide, nitric acid as well as metallic ascorbates or alkyl ascorbates, either as main or as secondary products. Ascorbic acid solution is reacted at room temperature or at elevated temperature with either sodium nitrite or potassium nitrite or calcium nitrite or alkyl nitrite such as isobutyl nitrite or barium nitrite or silver nitrite solution. All the second reactants except alkyl nitrites such as isoamyl nitrite or isopropyl nitrite or isobutyl nitrite, as well as the first reactant, ascorbic acid, are in aqueous solutions. The reaction vessel contains the ascorbic acid solution; into this solution, under, certain pressure, is delivered the choosen aqueous nitrite solution. Gas mixture of nitrogen dioxide and nitric oxide is produced by addition of the choosen nitrite solution. The generated and collected gas mixture is then mixed with oxygen, thus the nitric oxide in the gas mixture converts—by reacting with oxygen—into nitrogen dioxide, then this homogeneous gas is dissolved in water, thus giving us nitric acid. In this chemical reaction system two sets of chemical reactions take place; one on the surface of the solution(s) that produces the main part of the gas mixture, and this is the major part of the chemical reaction system. In the liquid phase of the reaction processes form the metallic ascorbates as well as the alkyl ascorbates. All the same can be done with isoascorbic acid; the chemical reactions will go somewhat slower.

The invention discloses a method for preparing 1H-1,2,3-triazole. The method comprises the following steps of: in a polar solvent, reacting glyoxal and hydrazine hydrate to obtain an intermediate 1, and then performing cyclization under the action of potassium permanganate to obtain an intermediate 2, reacting the intermediate 2 and potassium nitrite under acidic conditions for deamination to obtain a crude product triazole, and further purifying the crude product to obtain the finished product triazole. The method has the advantages of simple operation, short production cycle, and simple post-treatment, and the product has high yield, good purity and low cost, and is more suitable for industrial large-scale production.

The present invention relates to a novel method for producing aromatic chlorine or bromine compounds having the formula (II) by diazotization of formula (I) in the presence of aqueous hydrochloric or hydrobromic acids using sodium nitrite or potassium nitrite and subsequent conversion with an iron (II) or iron (III) compound, optionally in the presence of additional amounts of hydrogen chloride or bromide or alkaline or alkaline earth chlorides or bromides.

The invention discloses a chemical reinforced composition of silica coating glass for panel display, which comprises the following parts: fusing salt with 85-99% potassium nitrate and 0.01-10% bialuminium trioxide, 0.01-10% other potassium salts, wherein the potassium salt contains one or more from potassium phosphate, potassium nitrite, potassium chloride, potassium sulfate, potassium silicate, potassium hydrogen phosphate and potassium bichromate.

The invention relates to a flue gas purification device and method combining photo-catalytic oxidization and double cyclic absorption. A first flue gas heat exchanger is arranged in a flue between an air pre-heater and an electrostatic dust remover and is used for conveying a compound oxidizing agent; after the compound oxidizing agent absorbs heat of flue gas to be atomized, the atomized compound oxidizing agent is catalyzed and activated in a photoassisted catalysis and activation reactor, various free radicals are generated and make contact with desulfurized and decarburized flue gas, in-situ oxidization reaction of various pollutants is performed, NO is converted into high-valence-state NOx, HgO is oxidized into Hg2+, NOx and Hg2+ enter a second-stage spraying tower along with the flue gas, supernatant of waste liquid of a first-stage spraying tower is mixed with second-stage absorbing liquid to form composite absorbing liquid, the composite absorbing liquid absorbs and removes NOx and Hg2+, and SO2 and CO2 are further removed; humic acid crystals are obtained through solid-phase drying and crystallizing of the two stages of spraying towers, reaction products including potassium sulphate, potassium carbonate, potassium nitrate, potassium nitrite and other agricultural common-use fertilizer are separated out through flue gas heating and drying of liquid phase, and resource utilization is facilitated.

The invention discloses an inorganic salt etching solution used for electrochemically etching highly fine lines. The inorganic salt etching solution is prepared from the following gcomponents: potassium chloride, potassium nitrite, potassium phosphate, coordination agent, additive and water. The concentration of each component of the inorganic salt etching solution is accurate, the accuracy of the copper foil of a printed-circuit board can be controlled below 10 mum by an electrochemically etching method, the etching accuracy is high, the etching speed is stable, the etching is uniform, the etching solution is easy to regenerate and has small pollution, a preparation method of the inorganic salt etching solution is simple, and the inorganic salt etching solution has low production cost, a wide application scope and good economic and social benefits.

The invention discloses a multifunctional combined type ecological slope protection substrate. The multifunctional combined type ecological slope protection substrate is made of sandy soil, cement, organic materials, polypropylene fibers, superphosphate, diammonium phosphate, monopotassium phosphate, potassium polyacrylate, potassium nitrite, potassium sulfate and soil activation fungicide by uniformly mixing and can create the soil environment which is reasonable in structure, anti-freezing, anti-scouring, high in fertilizer efficiency and activation potential and long in water retention and drought enduring property for the bare slope in the high and cold area, so that damaged slope vegetation can be restored; the materials used by the slope protection substrate are low in cost, convenient to construct and high in technical operability and has wide application prospect.

Provided is a method for nitriding a metal in a salt bath by using a non-cyanide salt and a nitrided metal manufactured using the same. The method includes the steps of: immerging at least one salt selected from the group consisting of KNO3, KNO2, Ca(NO3)2, NaNO3 and NaNO2 into the salt bath; melting the salt by heating and maintaining the molten salt at a predetermined temperature; and submerging the metal in the salt bath. Nitriding in non-cyanide salts, such as potassium nitrate (KNO3), potassium nitrite (KNO2), sodium nitrate (NaNO3), sodium nitrite (NaNO2), calcium nitrate (Ca(NO3)2) and their mixtures, is capable of solving an environmental pollution problem and reducing a cost. Also, the method is capable of increasing nitrided depth of the metal two to six times compared to conventional nitriding methods. As a result, the method can be carried out in various application fields.

The invention discloses a method for synthesizing tanshinol, which comprises the following steps of: 1) performing Friedel-Crafts acylation reaction on R-tyrosine serving as a raw material and an acylation reagent under the catalytic condition of Lewis acid; 2) performing diazotization reaction on the product in the step 1) and sodium nitrite or potassium nitrite under the catalytic condition of acid; and 3) performing Dakin reaction on the product in the step 2) and a peroxide under the action of alkali to obtain the tanshinol, wherein the reaction equation is shown as (3). In the synthesizing method, the raw materials are easily obtained, the operation is simple, and large-scale industrialized production is suitable.

The invention discloses an environment-friendly wastewater treating agent and a preparing method thereof. The environment-friendly wastewater treating agent is prepared from, by weight, 12-16 parts of bamboo vinegar, 16-18 parts of propylene amide, 20-24 parts of diethylenetriamine, 16-20 parts of sodium silicate, 16-18 parts of sodium lignin sulfonate, 10-12 parts of tannin, 12-18 parts of active carbon, 18-20 parts of potassium nitrite, 10-16 parts of polyaluminum chloride, 8-12 parts of ammonium persulfate, 12-18 parts of water glass, 16-22 parts of ferrous sulfate, 12-18 parts of sodium acetate, 10-12 parts of triethanolamine and 16-18 parts of zeolite. The environment-friendly wastewater treating agent is environmentally friendly, nontoxic, high in purifying speed and good in purifying effect.

The invention discloses a nutrient solution for soiless tomato cultivation. The nutrient solution comprises the following raw materials: ammonium sulfate, potassium nitrite, calcium nitrate, magnesium sulfate, potassium dihydrogen phosphate, potassium, superphosphate,disodium edetate, ferrous sulfate, boric acid, manganese sulfate, copper sulfate, zinc sulfate and ammonium molybdate. Above raw materials are made into solution A, solution B and solution C. The nutrient solution is reasonable in structure and rich in nutrition, so that nutrition needed by tomatoes in each period can be satisfied. Meanwhile, self resistance can be reinforced, the incidence of pests and diseases is reduced, the using amount of pesticides is reduced, and the yield and quality of vegetables are improved. In addition, the use of chemical fertilizers is reduced, the labor cost is reduced, and the operation is simple, so that the economic benefits are effectively improved.

The invention discloses a high-strength and good-abrasion-resistance zirconium carbide ceramic material and a preparing method thereof. The high-strength and good-abrasion-resistance zirconium carbide ceramic material comprises, by weight, 16-18 parts of kaolin, 80-95 parts of zirconium carbide, 2-3 parts of tungsten powder, 7-9 parts of black corundum powder, 3-4 parts of stainless steel powder, 6-8 parts of coal ash, 8-12 parts of ceramic waste, 1-3 parts of polysilicic acid ferric sulfate, 2-3 parts of water glass, 6-8 parts of white oil, 3-5 parts of ferro-silicon nitride powder, 1-3 parts of red mud, 1-2 parts of molybdenum disilicide, 2-4 parts of polyvinyl alcohol, 0.5-0.8 part of potassium nitrite, 5-7 parts of auxiliaries and an appropriate amount of water. The zirconium carbide serves as the main raw material of the ceramic material, and the prepared ceramic material has good high-temperature resisting performance, electric conduction performance and heat conducting performance, high mechanical strength and chemical stability; in addition, the fire resistance of the ceramic material is enhanced through the black corundum powder, the ferro-silicon nitride powder and the like; the abrasion resistance of the ceramic material is further improved through the tungsten powder, the stainless steel powder, the molybdenum disilicide, the auxiliaries and the like; and the quality of the product is guaranteed.

The invention discloses a chemical energy-increasing high-efficiency discharge aiding agent and a preparation method and a use method thereof and belongs to the field of oil exploitation. The chemicalenergy-increasing high-efficiency discharge aiding agent is prepared from a cationic surface active agent, a fluorocarbon surface active agent and an energy producing chemical agent, wherein a mass ratio of the cationic surface active agent to the fluorocarbon surface active agent to the energy producing chemical agent is (6 to 8) to (1 to 1.6) to 1; the energy producing chemical agent is a mixture of compound A and compound B; the compound A is ammonium bioxalate, ammonium oxalate, ammonium chlorate, hydrogen peroxide or ammonium chloride; the compound B is potassium nitrite. The discharge aiding agent can generate a lot of gas to improve flowback energy of a fracturing and gel breaking solution, promote high-efficiency flowback of the fracturing and gel breaking solution, reduce fracturing solution adhesion damage and is suitable for being applied to a compact oil reservoir oil well fracturing and production increasing technology to promote the flowback of fracturing and gel breaking solution. The preparation method comprises the steps: taking the cationic surface active agent, the fluorocarbon surface active agent and the energy producing chemical agent; mixing; fully and evenly stirring to prepare the chemical energy-increasing high-efficiency discharge aiding agent. The method is simple, and the utilized raw materials are easy to obtain.

The invention relates to a quick foaming agent for foaming emulsion explosives, which consists of a stabilizing agent and an accelerating agent. The addition amount of the stabilizing agent is 0.3 to 0.5 percent of an emulsion explosive; the addition amount of the accelerating agent is 1.2 to 1.5 times weight of the stabilizing agent of the emulsion explosive; the stabilizing agent consists of the following components in percentage by weight: 0.5 to 1.5 percent of sulfourea, 20 to 30 percent of sodium nitrite, 3 to 5 percent of potassium nitrite, and 63.5 to 76.5 percent of water; and the accelerating agent consists of the following components in percentage by weight: 7 to 11 percent of ammonium nitrate, 2 to 3 percent of hydrogen nitrate, 1 to 3 percent of glacial acetic acid, 0.2 to 0.5 percent of sodium thiocyanate, 0.5 to 0.7 percent of phosphoric acid, 1 to 2 percent of diammonium hydrogen phosphate, 0.5 to 1.2 percent of citric acid, 1 to 3 percent of urea and 75.6 to 86.8 percent of water. The quick foaming agent has the characteristics of high foaming speed, low corrosion, small aftereffect and the like; meanwhile, the ratio of foam materials can be adjusted according to the formula and process conditions of the emulsion explosive and performance requirement, and the continuous production of emulsion explosive packages is realized.

The invention discloses high-efficiency chemical water-stemming which comprises an outer packaging film (1) and a liquid (2), wherein the liquid (2) is sealed in the outer packaging film (1); the liquid (2) comprises components in parts by weight as follows: 6-8 parts of a smoke eliminating agent, 6-9 parts of a flame eliminating agent, 5-7 parts of a foaming agent, 6-7 parts of a detergent, 7-9 parts of a dust depressor and 60-70 parts of water; the main component of the smoke eliminating agent is a mixture of sodium carbonate, sodium hydrogen carbonate, sodium phosphate and sodium silicate; the main component of the flame eliminating agent is a mixture of potassium sulphate, potassium nitrate, sodium chloride and potassium chloride; the main component(s) of the foaming agent are / is sodium nitrite and / or potassium nitrite; the main component of the detergent is sodium dodecyl benzene sulfonate; and the main component of the dust depressor is a mixture of water-soluble polymer, glycerol and calcium chloride. The high-efficiency chemical water-stemming has excellent effects of degrading and dissolving poisonous gases, eliminating smoke and flame, suppressing dust and blocking blasting holes; the cost is low; and the high-efficiency chemical water-stemming is widely applied to fields where the space of a roadway is small, the wind speed is low, and poisonous and hazardous gases are difficult to dilute.

The invention discloses a wood and straw fiberboard utilizing an inorganic adhesive and a preparation method, and the wood and straw fiberboard comprises the following raw materials in parts by weight: 40-50 parts of light calcined magnesia powder, 2-5 parts of talcum powder, 1-3 parts of high-alumina cement, 0.2-0.5 part of phosphogypsum, 7-12 parts of fly ash or slag powder, 3-5 parts of activated bauxite filler, 1-3 parts of kaolin, 25-35 parts of straw fiber, wood chip or bamboo chip fiber, 22-30 parts of magnesium sulfate heptahydrate, 0.1-0.3 part of aluminum sulfate hexadecahydrate, 0.1-0.5 part of citric acid, 0.2-0.5 part of trisodium phosphate, 0.2-0.4 part of ferrous sulfate, 0.2-0.3 part of an AF high-efficiency water reducing agent, 0.01-0.02 part of sodium pyrophosphate, 0.01-0.02 part of oxalic acid, 0.05-0.1 part of sodium tetraborate decahydrate, 0.01-0.02 part of sodium fluosilicate, 0.05-0.1 part of sodium silicate, 0.01-0.02 part of potassium nitrite and 25-30 parts of water. The invention provides a preparation method of the artificial fiber board which has no toxic and harmful substances, has environmental protection, strong comprehensive physical properties, realizes preparation at normal temperature and is simple in process.

The invention provides a clean fired coal saving agent with the effects of sulfur fixation, dust fall, heat increment and coal saving which is prepared and produced by industrially produced waste liquid and waste residues and chemical and mineral product raw materials. The clean fired coal saving agent is divided into two forms, namely a liquid product and a powder product; the liquid product is obtained by dissolving sodium nitrite, potassium nitrite, potassium nitrate, sodium nitrate, sodium sulfonate and sodium dodecyl benzene sulfonate into mixed liquid of paper making black liquid, alcohol waste liquid and fired coal fume water film dust removal and desulfurization alkali regeneration fluid; and the power product is obtained by absorbing and preparing the liquid product by utilizing hot fired coal slag, then allocating the chemical and mineral product raw materials and finally uniformly mixing, drying and crushing. The invention achieves cyclic resource utilization of industrial wastes, effectively solves the difficult problems of complete control of fired coal pollution and paper making and alcohol waste liquid pollution, has the advantages of innocuity, odorless, no three-waste emission, no increased investment and convenient operation and can use the device required not to be improved, save the coals per ton by 20-50 yuan and be used for all industrial and civil fired coals.

The invention discloses a method for preparing a fire-proof material from carbon chromium residue or titanium residue of a metallurgy furnace, comprising the following steps of: (a) crushing and ball-milling the carbon chromium residue and the titanium residue respectively to pass through a standard sieve more than 100 meshes; (b) proportioning the carbon chromium residue, talc and aluminum fluoride in parts by mass and ball-milling to obtain uniform powder which is used as mixed powder A for later use; or proportioning the titanium residue, the talc and the aluminum fluoride in parts by massand ball-milling to obtain uniform powder which is used as mixed powder B for later use; (c) adding silica sol and potassium nitrite to prepare slurry; and (d) pouring the slurry to a mould for drying and sintering to prepare the fire-proof material. By adopting the method, harm of environment pollution of the carbon chromium residue and the titanium residue is eliminated and comprehensive utilization of residues of the metallurgy furnace is realized by transformation of high valence chromium to low valence chromium by high-temperature sintering and overall solidification.

The invention discloses a fire extinguishing agent capable of extinguishing lithium battery fire and a preparation method. The aerosol fire extinguishing agent is prepared from components in percentage by mass as follows: 70%-80% of an oxidizing agent, 5%-10% of a combustible agent, 10%-20% of a modifier and 3%-5% of an adhesive, wherein the oxidizing agent is potassium nitrate or a mixture of potassium nitrate with one or more of potassium nitrite, guanidine nitrate, sodium nitrate, ammonium nitrate, barium nitrate, potassium perchlorate, ammonium perchlorate and potassium oxide. Compared with the prior art, the spray time can be shortened, the extinguishment efficiency can be improved, and the initial fire condition of power battery fire can be suppressed quickly.

The invention relates to a sensitizer special for an emulsion explosive, in particular to a foaming agent for the emulsion explosive. The foaming agent is formed by mixing an agent A and an agent B according to a weight ratio of 1:(1.2-1.5), wherein the agent A comprises the following components in percentage by weight: 0.5 to 1.2 percent of thiourea, 22 to 30 percent of sodium nitrate, 2.1 to 4.2 percent of potassium nitrite, 0.9 to 1.5 percent of urea and 63.1 to 74.5 percent of water; and the agent B comprises the following components in percentage by weight: 8 to 12 percent of ammonium nitrate, 1.5 to 3 percent of nitric acid, 1.2 to 2.5 percent of glacial acetic acid, 0.4 to 0.8 percent of phosphoric acid, 0.4 to 0.8 percent of citric acid, 1.5 to 3.5 percent of urea, 0.5 to 1.5 percent of sodium thiocyanate, 1 to 2 percent of sodium bicarbonate and 73.9 to 85.5 percent of water. The foaming agent has the advantages of high foaming speed, good foaming effect, small aftereffect, easily controlled density, high safety, low probability of extrusion and the like; meanwhile, the emulsion explosive sensitized by a chemical foaming agent has the characteristics of high explosion speed, large explosive capacity and the like.

The invention discloses enamel for a precious metal adornment surface coating. The enamel comprises a component A and a component B, wherein the component A comprises the following raw materials in parts by mass: 50-60 parts of SiO2, 14-45 parts of PbO, 14-20 parts of Na2O, 7-12 parts of K2O, 2-4 parts of Li2O, 1-2 parts of B2O3, 2-6 parts of BaO, 2-4 parts of P2O5 and 5-7 parts of TiO2; and the component B comprises the following raw materials in parts by mass: 0.1-0.75 part of borax, 0.01-0.06 part of gum tragacanth, 0.01-0.06 part of sodium alginate, 0.2-1 part of urea, 0.2-0.75 part of sodium nitrite, 0.1-0.5 part of potassium carbonate, 0.1-0.5 part of sodium chloride, 0.1-0.5 part of potassium chloride, 0.2-0.7 part of potassium nitrite, 0.4-2 parts of zinc oxide, 0.02-1 part of formaldehyde and 2-4 parts of pigment; and the component A comprises various components in enamel glaze, and the component B comprises various components in additives. The invention also discloses a method for processing the enamel. The invention simultaneously discloses a spraying method of the enamel on the precious metal adornment surface. The coating processed by the enamel formula according to the spraying method has bright and uniform semitransparent effect and is difficult to peel.

The invention relates to a nitrogen-doped porous carbon material, a preparation method thereof and application of the nitrogen-doped porous carbon material in a supercapacitor. The preparation methodcomprises the following steps: (1) heating and polymerizing a formaldehyde solution and melamine in water, and then adding potassium salt and polyethylene glycol to obtain a clear solution, wherein the potassium salt is at least one of potassium nitrate, potassium acetate, potassium nitrite, potassium sulfate, potassium sulfite, potassium chloride, potassium hypochlorite and potassium perchlorate;(2) drying the obtained clear solution at the temperature of 60-80 DEG C until a xerogel is formed; and (3) placing the obtained xerogel in a protective atmosphere, activating at the temperature of 700-1000 DEG C, and washing and drying to obtain the nitrogen-doped porous carbon material.

The invention discloses an aluminum alloy corrosion inhibitor which is prepared from the following raw materials in parts by weight: 1-2 parts of potassium nitrite, 20-100 parts of calcium gluconate, 2-5 parts of mercapto benzothiazole, 2-5 parts of borate, and 2-5 parts of hexadecane amine. A new technology is provided for reparation of required calcium gluconate from a water quality stabilizer; the new technology ensures that the aluminum alloy corrosion inhibitor is high in calcium gluconate yield, mild in reaction condition and simple and easily available in equipment, and is an environment-friendly production technology.

The invention discloses an alkaline P salt plating solution for electroplating platinum and an electroplating method thereof. In terms of platinum, the plating solution comprises 20-30g / L p salt, 90-110g / L ammonium nitrate, 8-12g / L potassium nitrite or sodium nitrite and 100-300mg / L sodium glutamate. The ammonium nitrate and the potassium nitrite or sodium are taken as auxiliary salts, and the sodium glutamate is taken as a brightening agent, so that the obtained plating solution has better dispersion force and deep plating cavity, high cathode current efficiency and excellent plating solution performance. A plating layer obtained by electroplating through the plating solution under an alkaline condition has low porosity, high brightness and good plating quality.

The invention relates to a special sensitizer for explosive, in particular to a foaming agent for emulsion explosive, which comprises an A agent and a B agent, and the A agent and the B agent are mixed according to the weight ratio of 1: 1.2-1.5, wherein the A agent comprises the following components by weight percent: 0.5%-1.5% of thiourea, 3%-5% of potassium nitrite, 20%-30% of sodium nitrite and 63.5%-76.5% of water; and the B agent comprises the following components by weight percent: 7%-11% of ammonium nitrate, 0.2%-0.6% of phosphoric acid, 0.5%-2% of diammonium phosphate, 0.5%-1.5% of sodium thiocyanate, 1.8%-2.5% of citric acid, 0.7%-1.5% of glacial acetic acid, 0.7%-1.5% of sodium bicarbonate, 0.2%-0.9% of thiourea, 0.2%-1% of sodium nitrate, 0.9%-1.5% of urea and 76%-87.3% of water. The foaming agent has the characteristics of short foaming time, appropriate after-effect, easiness in control of density, good safety performance, long natural storage period and the like.

The invention relates to the technical field of crop fertilizer preparation, and provides a nutrient solution for dendrobium candidum soil-less cultivation and a preparation method thereof. The nutrient solution for dendrobium candidum soil-less cultivation is mainly prepared from the following raw materials: potassium nitrite, monoammonium phosphate, triacontanol, manganese sulfate, copper sulfate, ammonium molybdate, a microbial agent, a tomato extraction solution, a marguerite leaf extraction solution, a folium perillae extraction solution, a cortex dictamni extraction solution, a linaria vulgaris flower extraction solution, an inula flower extraction solution and the like. According to the nutrient solution, the composition is scientific and reasonable, the nutrient solution has the efficacy of sterilization, pest killing and the like, diseases and pests are effectively reduced, nutrient substance absorption of crops is promoted, growth and development are promoted, the survival rate of dendrobium candidum seedlings is significantly improved, the yield of dendrobium candidum is greatly improved, the usage rates of chemicals and chemical fertilizers are reduced, the cost is reduced, thus the economic benefits of dendrobium candidum soil-less cultivation are significantly improved, and moreover, a soil-less cultivation method is simple, easy to operate, safe and environmentally friendly.