36 results about "Urea nitrate" patented technology

The invention discloses a production method of a readily available and controlled release composite fertilizer containing three nitrogen elements. The production method is as follows: raw materials containing nitric nitrogen, ammonium nitrogen and amido nitrogen are added in materials; in order to prevent that urea reacts with nitro phosphate fertilizer to generate too much urea nitrate and the production can not performed, ammonia gas is introduced in the granulation process according to different proportions to ammonify nitro phosphate fertilizer, reduce the generation of urea nitrate and increase the neutralization degree of monoammonium phosphate; and powdery fundamental fertilizers containing nitrogen, phosphorous and potassium are added to granulate, and then the composite fertilizer can be obtained through drying, cooling, screening and coating. In the production method of the invention, a lot of heat generated in the thermolysis of the nitro phosphate fertilizer and the neutralization heat of the reaction of ammonia gas and monoammonium phosphate are fully utilized to heat materials and increase the granulation temperature; and the viscosity of urea nitrate is utilized, the solubility of ammonium phosphate salt is increased, the quantity of the liquid phase for granulation can be satisfied, higher granulation rate can be realized without using other adhesive, the cost is reduced, the water content of the granulation material is significantly reduced, the drying energy consumption can be reduced and a large amount of energy consumption can be saved.

The invention discloses a quick-acting slow-released compound fertilizer and a preparation method thereof. The preparation method comprises the following steps of: adding a raw material containing nitrate nitrogen, ammonium nitrogen and amidonitrogen to materials, directly introducing gas ammonia to a material layer of a rotor drum granulator to finish ammoniation of ammonium nitrate phosphorus, and controlling the mass of urea nitrate generated by reaction. According to effective proportioning, the contents of nitrogen in the quick-acting slow-released compound fertilizer are as follows in percentage by mass: 2-5 percent of nitrate nitrogen, 6-9 percent of ammonium nitrogen and 7-11 percent of amidonitrogen. The phosphorous and potassium nutrient content is determined according to proportioning of different products. The ammonium nitrate phosphorus, containing the nitrate nitrogen, as the raw material is added by in two parts, i.e., the ammonium nitrate phosphorus containing 1-3 percent of nitrate nitrogen is added into the material layer, and the rest of ammonium nitrate phosphorus containing 1-2 percent of nitrate nitrogen is added into a part which is 1-1.5m away from the inlet of a cooler; and the surfaces of fertilizer particles subjected to drying and fine screening are wrapped, so that the quick-acting slow-released compound fertilizer has available nitrogen shells. The slow-released nitrogen urea is added in a solid manner, used as master batch for granulation and wrapped layer by layer by other material layers of nutrients, so that the quick-acting slow-released compound fertilizer has slow-released kernels.

The invention discloses an environment-friendly nitrogen potassium dressing fertilizer containing various nitrogen elements and a preparation method thereof. The fertilizer comprises, by weight, at least 20% of urea, 5-7% of ammonium bicarbonate, 7-15% of ammonium sulfate, 10-14% of nitrate, at least 8% of potassium chloride, 7% of humic acid, 8-12% of sepiolite, 5-7% of calcium hydroxide, other materials containing trace elements and a plant growth regulator. In a granulating process, urea nitrate generated by reaction of nitrate and urea and sepiolite with viscosity are used as adhesive, water generated by decomposing of ammonium bicarbonate is used as a liquid phasor, steam is used for increasing the temperature of granulating materials, liquid phasor required by granulation is supplemented, and a material granulating process is finished. The final product contains nitrate nitrogen, ammonium nitrogen, amidonitrogen, organic matters, various medium trace elements and the plant growth regulator and achieves the purposes of improving soil, reducing soil salinity, improving nutrient element absorption of plants, increasing plant quality and productivity and improving plant disease resistance.

The invention discloses a whole-process nutrient supply type composite fertilizer and a preparation method thereof. A raw material containing nitrate nitrogen, ammonium nitrogen, amide nitrogen, controlled release nitrogen and organic matters is added in the material. The components of the whole-process nutrient feeding type composite fertilizer are effectively proportioned in percentage by mass on the basis of nitrogen content: 2-4% of nitrate nitrogen, 5-8% of ammonium nitrogen, 5-8% of amide nitrogen and 6-10% of controlled release nitrogen, the contents of phosphorus and potassium are determined according to different product proportions, and the content of the organic matters is not less than 6%. In the production process, the viscosity of urea nitrate generated in a reaction of ammonium nitrate phosphate and urea and granulation tail gas washing water are used as liquid phase amount necessary for granulation to finish the material granulation process, in order to prevent excessive urea nitrate from being generated in the granulation process, ammonia gas is directly introduced into the material layer of a rotor drum granulator to finish the ammoniation treatment of ammonium nitrate phosphate and control the quantity of the urea nitrate generated in the reaction. The fertilizer not only can improve the utilization rate of fertilizer nutrients and ensure the whole-process nutrient supply of crops so as to increase the yield of the crops and improve the quality, but also can avoid harm caused by escherichia coli and such toxic substances as heavy metal, improve the soil, reduce the soil salinity and fertilize the land.

The invention discloses nitrogen oxide tail gas absorption solution which comprises the following components by weight percentage: 10-20% of urea, 3-15% of hydrochloric acid, 3-20% of nitric acid, and the balance of water. The invention further discloses a method for preparing powdered nitric acid with the nitrogen oxide tail gas absorption solution. The method comprises the steps that nitrogen oxide tail gas is supplied to a buffer tank filled with distilled water for cooling, initial absorption and tail gas flow velocity buffer; the nitrogen oxide tail gas is introduced into an absorption tower for multistage absorption; the temperature of the absorption solution is controlled at 15-25 DEG C; when urea nitrate is crystallized in the absorption solution, the absorption solution is frozen to be below 10 DEG C; a urea nitrate crystal (the powered nitric acid) is separated by crystallization; and a mother solution is recycled after consumed urea is supplemented and water volume is shifted. The nitrogen oxide tail gas absorption solution and the method have the advantages that the absorption efficiency of the nitrogen oxide tail gas is high, the urea consumption is small, the absorption solution can be recycled; the environmental protection management cost is low; powdered nitric acid is synthesized by the nitrogen oxide tail gas absorption solution; the production cost of powdered nitric acid is lowered; and the environmental pollution of the nitrogen oxide tail gas is solved.

The invention discloses a slow-release type solid chlorine dioxide generating agent and a preparation method thereof. The slow-release type solid chlorine dioxide generating agent has the advantages of plain and thin smell, stable concentration character, long lasting period and convenience in use. The slow-release type solid chlorine dioxide generating agent is prepared from the following components in parts by mass: 15 to 25 parts of sodium chlorite, 10 to 20 parts of urea nitrate, 40 to 50 parts of medical stone, 4 to 8 parts of magnesium sulfate, 4 to 8 parts of calcium sulfate, 3 to 8 parts of super absorbent resin and 2 to 6 parts of beta-cyclodextrin. The preparation method comprises the steps of smashing the medical stone into small particles and activating for 60 to 120 minutes at 90 to 100 DEG C to open inner holes of the medical stone; with the activated medical stone as a carrier, adding magnesium sulfate and calcium sulfate; adding sodium chlorite and urea nitrate; drying under assistance of the super absorbent resin; adding beta-cyclodextrin and curing into particle shapes; utilizing antioxidant aluminum plastic package bags to seal and package the cured particle-shaped products. The slow-release type solid chlorine dioxide generating agent can be widely applied to the field of space environment purification.

The invention discloses an acid solution system for acidifying carbonate reservoir rocks, and belongs to the field of petrochemical industry. The acid solution system comprises the following components in percentages by mass: 10-50% of sulfamic acid, 10-50% of urea nitrate, 3-15% of organic weak acid, 0.1-5% of a cosolvent, 0.1-2% of a corrosion inhibitor, and the balance being water. The acid solution system has the advantages of high corrosion rate, large increasing range of the corrosion rate, low corrosion rate, and the like. The acid solution system provided by an embodiment has the advantages of simple formula, wide freight source of each component, transport convenience, and low cost; and the system is good for large scale on-site construction application.

Formulations of reactive materials, such as aluminum, magnesium and alloys thereof, with combustible additives such as wood derivatives or charcoal, provide a composition for neutralizing energetic materials via combustion. Specifically, explosive substances such as ammonium nitrate and urea nitrate, which are commonly used as homemade explosives, are rapidly incinerated in a non-propagating manner by the contact with burning reactive material formulations.

A method for preparing high-purity manganese dioxide is characterized in that the method comprises the following steps: adding a certain proportion of additives to high-purity manganese nitrate solution with the weight concentration being 30% to 70%; and pyrolyzing at the temperature of 150 to 250 DEG C to obtain the high-purity manganese dioxide, wherein, the selected additives include one or more of ammonium carbonate, ammonium hydrogen carbonate, ammonium nitrate, carbamide and urea nitrate; and the proportion of the additives in the manganese nitrate solution is 1% to 15% by the weight of manganese nitrate.

The invention relates to a method for decomposing phosphorite through urea nitrate to prepare a granular urea nitrate compound fertilizer. The method includes the steps of preparing a urea nitrate water solution and conducting phosphorite decomposing, neutralizing, granulating and the like. The compound fertilizer is prepared through the one-step method of decomposing phosphorite through the ureanitrate solution, the temperature required for reaction is low, the volatile loss of nitrogen is reduced, the phosphorite conversion rate can reach 95% or above, the defect that a calcium nitrate product is prone to moisture absorption in the process of decomposing phosphorite through nitric acid is overcome by means of the method, the fluorine escape rate is greatly reduced, and the method is anenergy-saving and environment-friendly type urea nitrate compound fertilizer production process with diversified nitrogen nutrient form and high efficiency.

A liquid fertilizer for soil cultivation that realizes use of urea nitrate substantially not having been utilized as a fertilizer to date and attains exertion of strikingly enhanced fertilizer effects. There is provided a liquid fertilizer for soil cultivation comprising urea nitrate wherein the content of urea nitrate is in the range of 0.006 to 1.2 wt.%. By application of this liquid fertilizer for soil cultivation onto the soil surface and/or in the earth while avoiding direct contact with the leaves of germinating crops, crop cultivation can be carried out without phytotoxicity.

The invention discloses a method for synthesizing L-2,4-dinitrophenylalanine. L-phenylalanine or L-4-nitrophenylalanine which is used as a raw material and urea nitrate and concentrated sulfuric acid which are used as nitration reagents are subjected to nitration reaction, the reaction temperature is between 50 and 80 DEG C, and the reaction time is 4 to 10 hours; and after the reaction is finished, the reaction solution is neutralized by alkali water solution, dehydrated and recrystallized by a solvent to form the L-2,4-dinitrophenylalanine. The method for synthesizing the L-2,4-dinitrophenylalanine has the characteristics of simple process, little side reaction, high yield, and the like.

The present invention provides a solid fertilizer composition comprising urea nitrate and calcium phosphate; and a liquid fertilizer composition comprising urea nitrate and calcium phosphate both dissolved in water. These fertilizer compositions are fertilizers capable of feeding nitrogen, phosphoric acid and calcium which are crucial for the growth of plants, excelling in storage stability, and when dissolved in water, would not generate phosphate precipitates. These fertilizer compositions are suitable for use in a nutrient solution cultivation method, and, for example, the liquid fertilizer composition is applied to the stems and/or leaves of plants.

The invention provides a low explosive for metal welding. The low explosive comprises, in percent by weight, 27-30% of urea, 27-30% of nitric acid, 18-20% of ammonium nitrate, 0.10-0.15% of octadecyl primary amine, 21.90-25.85% of deposit white carbon black, and water. The low explosive is prepared according to the following preparation method: firstly adding 27-30 Kg of urea into 30-35 Kg of water according to the batches, heating to 30-40 DEG C, stirring, after dissolving, adding 27-30 Kg of nitric acid at a uniform speed within 10 min, and stirring for 30 min, so as to generate urea nitrate; adding 18-20 Kg of ammonium nitrate and 0.10-0.15 Kg of octadecyl primary amine into urea nitrate, heating with stirring, controlling the heating temperature for 100-110 DEG C, after 30 min, performing vacuum drying and crushing; and adding 21.90-25.85 Kg of deposit white carbon black, and performing grinding and uniform mixing, so as to obtain the low explosive for metal welding. The material cost is low, production is simple, the detonation sensitivity is good, the detonation velocity is stable and adjustable, the explosive detonation velocity is 2000-2400 m/s, the storage life is within 1 year, the explosive does not cake, production is safe and simple, the employed materials all do not contain toxic and harmful compositions, and the production and usage processes are harmless to contact personnel and environment.

The invention relates to a gas generating agent, which comprises, by mass, 76-80% of a component A, 12-21% of a component B and 3-8% of an auxiliary agent, the component A comprises urea nitrate and guanidine nitrate according to a certain ratio, the component B comprises potassium nitrate and ethylenediamine chromate according to a certain ratio, and the auxiliary agent is sodium tetraborate. The formula has the advantages that oxygen balance is easy to achieve, the combustion performance is good, the gas production rate is high, the mechanical sensitivity is low, storage is easy and the like, gas production components are basically non-toxic CO2, N2 and water vapor, and the non-sodium-azide gas production agent is an ideal non-sodium-azide gas production agent.