7 results about "Calcium ammonium nitrate" patented technology

The invention provides a process for the preparation of polyhalite granules comprising the steps of providing an aqueous ammonium nitrate (AN) solution; heating the solution to produce a hot solution; adding the hot solution to polyhalite; and allowing the mixture to cool during a granulation process. The invention further provides a process for the preparation of polyhalite granules where polyhalite is granulated with ammonium nitrate to form potassium nitrate, calcium ammonium nitrate, ammonium nitrate and / or magnesium nitrate and ammonium sulphate and a polyhalite granule comprising polyhalite and potassium ammonium nitrate.

The invention relates to the technical field of wastewater treatment, in particular to a calcium ammonium nitrate wastewater treatment device and method.The device comprises a PH adjusting tank, a buffer tank, a heat exchanger, a multi-medium filter, a precision filter, a ceramic filter, an ultrafiltration device, a concentration reverse osmosis device, a desalination reverse osmosis device, a concentrated water reverse osmosis device and wastewater discharge system equipment; the multi-medium filter comprises a filter tank body, a fiber ball filter material layer is arranged in the filter tank body, and a liftable compression frame and bearing frame structure is arranged; the compression frame moves along the vertical guide pipe through a magnetic force driving mechanism, compresses the fiber balls to form a gradient pore structure during filtration, and moves upwards to release the fiber balls and trigger the dispersion frame to unfold during backwashing so as to assist in loose cleaning of the fiber balls; the compression frame is sleeved on a vertical guide pipe in the filter tank body in a lifting manner, and the bearing frame is movably hoisted at the bottom of the guide pipe; the device disclosed by the invention can efficiently realize graded purification and resource recovery.

The utility model belongs to a calcium ammonium nitrate production system. Comprising a calcium ammonium nitrate production unit and an oil ring type vacuumizing unit connected with the calcium ammonium nitrate production unit, the calcium ammonium nitrate production unit at least comprises a single-effect condensate separator, a gas phase outlet of the single-effect condensate separator is connected with a single-effect evaporator, a gas phase outlet of the single-effect evaporator is connected with a single-effect evaporation separator, a gas phase of the single-effect evaporation separator is connected with a single-effect evaporation condenser, and a gas phase of the single-effect evaporation condenser is connected with a gas phase outlet of the single-effect evaporator. A gas phase outlet of the single-effect evaporative condenser is connected with the oil ring type vacuumizing unit; the oil ring type vacuumizing unit at least comprises a membrane type separation assembly capable of realizing oil-water separation; the device has the characteristics that the energy consumption is low, the efficiency is high, cavitation and icing phenomena are avoided, the running state of the device is stable, circulating oil can flow back and be recycled, waste is reduced, and the cost is saved.

The invention belongs to the technical field of wastewater treatment, and particularly relates to a comprehensive utilization method of sulfuric acid and nitric acid mixed acid wastewater. Comprising the following steps: S1, mixing sulfuric acid and nitric acid mixed wastewater with a waste PCB, automatically carrying out catalytic oxidation reaction, and carrying out filter pressing to obtain a copper sulfate solution and tail gas; s2, urea is added into the copper sulfate solution, phosphoric acid and ammonia water are added after no bubbles are generated, stirring and filtering are conducted, and a purified copper sulfate solution is obtained; evaporating, crystallizing, centrifuging, washing and separating the purified copper sulfate solution to obtain copper sulfate pentahydrate; and S3, spraying and absorbing the tail gas in the step S1 to obtain dilute nitric acid, adding lime to adjust the pH value to 1.2-1.6, adding ammonia water to adjust the pH value to 7 to obtain calcium ammonium nitrate mother liquor, and performing evaporative crystallization and granulation on the calcium ammonium nitrate mother liquor to obtain calcium ammonium nitrate. According to the method, the sulfuric acid and nitric acid mixed acid wastewater and the waste PCB are used for synergistically preparing high-purity copper sulfate pentahydrate and calcium ammonium nitrate for the first time.

The application relates to the technical field of concrete production, and particularly discloses an anti-cracking and anti-corrosion concrete and a production method thereof. The anti-cracking and anti-corrosion concrete is prepared from the following components in parts by weight: 250-320 parts of sulphoaluminate cement, 700-850 parts of gravel, 350-450 parts of sand, 110-190 parts of kaolin, 60-130 parts of blast furnace slag, 20-50 parts of feldspar powder, 20-40 parts of composite fiber, 8-20 parts of corrosion inhibitor and 150-200 parts of water; the composite fiber comprises polypropylene fiber, glass fiber and carbon fiber; the corrosion inhibitor is sodium diisooctyl sulfosuccinate and hydroxypropyl distarch phosphate coated calcium ammonium nitrate. The composite fiber and the corrosion inhibitor are added into the raw materials for preparing the concrete, the corrosion speed of chloride ions is slowed down, and the anti-cracking performance and the anti-corrosion performance of the concrete are improved.

The present application relates to the technical field of calcium ammonium nitrate, and particularly relates to a method for producing spherical calcium ammonium nitrate particles by high-tower granulation. The present application discloses a method for producing spherical calcium ammonium nitrate particles by high-tower granulation, which comprises the following steps: ingredient mixing, in which calcium ammonium nitrate containing trace amounts of magnesium is delivered into a first mixing tank at the top of a granulation tower, and calcium ammonium nitrate return material is subjected to melt mixing; after the melt mixing is completed, overflow is performed to enter a second mixing tank, and melt mixing is performed again to obtain a melt liquid; granulation and screening, in which the melt liquid is subjected to granulation by overflow into a granulator, and after cooling and screening, calcium ammonium nitrate products are obtained. The method disclosed in the present application adopts a melt method for high-tower melt granulation, and compared with a traditional spray method for granulation, the method has lower energy consumption, very low dust emission, and the calcium ammonium nitrate products have round particles, no irregular particles, and a particle size of 2-4 mm, which meets the requirements of seed and fertilizer intercropping and mechanized large-scale machine sowing.

Disclosed is a fertilizer containing calcium ammonium nitrate and ammonium sulfate. Methods of making and using the fertilizer are also disclosed.