8 results about "Phosphorus calcium" patented technology

The invention relates to a high-temperature acidolysis reaction defluorination method, and belongs to the technical field of phosphorus chemical resource recycling. The technical problem to be solved by the invention is to provide a high-temperature acidolysis reaction defluorination method which is simple to operate and high in defluorination rate. According to the method, phosphorite powder / white fertilizer is subjected to high-temperature acidolysis, fluoride in the phosphorite powder / white fertilizer reacts with strong acid, fluorine is separated from a reaction system in a gas form, and hydrofluoric acid is obtained through condensation. The method is simple, is simple and convenient to operate, and is easy to realize technologized large-scale production. Meanwhile, due to the destructive effect of the strong acid on the lattice structure of the phosphorus-calcium compound, citrate-soluble phosphorus can be converted into soluble phosphate, subsequent phosphorus recovery is facilitated, comprehensive utilization of phosphorite and elimination of white fertilizer output are achieved, meanwhile, the problems of material accumulation and resource waste of enterprises are solved, and the method conforms to the circular economy concept of green development.

The invention relates to the technical field of fertilizer preparation, and particularly discloses a modified flotation phosphate tailing-based composite calcium magnesium phosphate fertilizer and a preparation method thereof, and the composite calcium magnesium phosphate fertilizer is prepared from modified flotation phosphate tailings, dolomite, limestone, an activator, a binder, a magnesium supplement conditioner and water. The flotation phosphate tailings are deeply modified by adopting a composite pretreatment liquid synergistic activation-gradient composite modification process, so that the effectiveness of nutrients such as phosphorus, calcium and magnesium in the flotation phosphate tailings and the environmental safety are remarkably improved; and through the raw material compounding design of calcium and magnesium source collaboration, gradient magnesium supplementation and conditioning synergism, quick-acting and long-acting collaborative supply of nutrients and a soil improvement function are realized. The flotation phosphate tailings are used as main raw materials, the technological process is simple, energy consumption is low, the prepared composite calcium magnesium phosphate fertilizer is balanced in nutrient, lasting in fertilizer efficiency and excellent in physical performance, and unification of solid waste recycling, product high value and production greenization is achieved.

The invention discloses a crocodile functional compound feed and a preparation method thereof, and the crocodile functional compound feed comprises the following raw materials: a compound animal protein source, a compound vegetable protein and energy source, a core functional additive, a compound grease source, a compound premix and a phosphorus calcium source, the functional additive comprises astragalus membranaceus, isatis root, radix bupleuri, liquorice, oriental wormwood, cowherb seed, astaxanthin, nano-selenium and zinc methionine, the compound premix comprises vitamin and mineral components, and the bait coefficient of the compound feed is lower than 1.5. According to the feed, chilled fresh fish can be replaced with the efficient replacement ratio of 1: 5, the breakthrough breeding effects that the survival rate of crocodiles is increased by 30%, the growth rate is increased by 20%, the laying rate is increased by 40%, and the bait coefficient is reduced to 1.3 or below are achieved, and the economic benefits are extremely remarkable.

The application belongs to the field of industrial wastewater, and particularly relates to a double-layer filler calcium fluorophosphate crystallization deep fluorine removal system and a method thereof. The mixing distribution area of the fluidized bed system is provided with a water inlet pipe, the water inlet pipe is respectively provided with a first dosing pipe and a second dosing pipe, and the dosing pipes are connected with the water inlet pipe through a pipeline mixer. The first dosing pipe adds phosphates and inorganic acid, and the second dosing pipe adds calcium salt. Industrial fluorine-containing wastewater enters the mixing distribution area, the reagent in the first dosing pipe makes the pH value of the wastewater acidic, avoiding pipeline blockage; then the wastewater enters the pH adjusting area and contacts with the first layer of filler, the pH value of the wastewater changes to neutral to alkaline; then the wastewater enters the induced crystallization area, the fluorine ions in the wastewater generate calcium fluorophosphate crystals with the phosphates and the calcium salt on the surface of the filler, realizing efficient fluorine removal. Through the principle of acidic pH in the mixing distribution area and neutral to alkaline pH in the induced crystallization area, the application guarantees smooth water inlet and deep fluorine removal of the wastewater.

The invention belongs to the technical field of electrochemistry, and relates to a system for recovering phosphorus, calcium and magnesium through electrochemistry-biochar coupling and producing a slow release fertilizer as a byproduct, which comprises an electrochemical pumping module and a biochar fixed bed module, the electrochemical pumping module realizes membrane-free alkalization through an anode pumping process and is provided with a water inlet and an alkaline solution overflow port; a lower inlet of the biochar fixed bed module is communicated with an overflow port of the electrochemical pumping module, the biochar fixed bed module is filled with a biochar filter material, and an overflow port is formed in the upper part of the biochar fixed bed module and used for capturing phosphate precipitates and synchronously completing solid-liquid separation and slow release fertilizer forming; according to the invention, through modularized collaborative integration, alkalization, precipitation, separation and product forming procedures in the phosphorus recovery process are integrated in a continuous running whole device, so that the use of a membrane assembly is avoided, and chemical alkali feeding and independent solid-liquid separation units in the traditional process are omitted; therefore, a simple, efficient, economical and environment-friendly phosphorus recovery path is provided.

The invention discloses a method for preparing phosphate concentrate, calcium hydrophosphate and magnesium ammonium phosphate by leaching and calcining phosphate tailings with dilute phosphoric acid. The method comprises the following steps: carrying out acid leaching on the phosphate tailings calcined under a certain condition by adopting the dilute phosphoric acid, and filtering to obtain the phosphate concentrate and leachate rich in phosphorus, calcium and magnesium; ammonium hydroxide is added into the leachate, calcium hydrogen phosphate and magnesium ammonium phosphate are obtained through fractional precipitation, and the quality of the obtained product meets the corresponding national standard requirement; according to the method, dilute phosphoric acid is used for leaching the calcined phosphate tailings, magnesium oxide and calcium oxide in the calcined phosphate tailings can be leached out in a high-selectivity mode, and other inorganic impurities cannot be introduced; by producing high-quality phosphate concentrate, calcium hydrophosphate and magnesium ammonium phosphate, efficient utilization of phosphate tailings is realized.

The invention belongs to the field of industrial wastewater, and particularly relates to a double-layer filler calcium fluorophosphate crystallization deep defluorination system and a method thereof.The mixing distribution area of a fluidized bed system is provided with a water inlet pipe, the water inlet pipe is provided with a first dosing pipe and a second dosing pipe, and the dosing pipes are connected with the water inlet pipe through a pipeline mixer; phosphate and inorganic acid are added into the first dosing pipe, and calcium salt is added into the second dosing pipe. The industrial fluorine-containing wastewater enters the mixing distribution area, and the pH value of the wastewater is acidic by virtue of an agent in the first dosing pipe, so that pipeline blockage is avoided; then the wastewater enters a pH adjusting area to be in contact with the first layer of filler, and the pH value of the wastewater is changed into neutral to alkaline; then the wastewater enters an induced crystallization area, fluorine ions in the wastewater, phosphate and calcium salt generate calcium fluorophosphate crystals on the surface of the filler, and efficient fluorine removal is achieved. According to the principle that the pH of the mixing distribution area is acidic and the pH of the induced crystallization area is neutral to alkaline, water inflow is smooth and not prone to blockage, and deep fluorine removal of wastewater is achieved.

The present application relates to the technical field of nutrient solution, in particular to a hydroponic flower rooting liquid fertilizer as well as a preparation method and application thereof, the liquid fertilizer comprises the following components in mass percentage: 8-16% of potassium dihydrogen phosphate; 12-18% of calcium nitrate; 2-4% of potassium fulvate; 0.003-0.006% of naphthalene acetic acid; 0.003-0.008% of potassium indole butyric acid; 0.10-0.20% of citric acid; and the balance is water; rooting-nutrition-stability multifunctional integration is realized, and the risk brought by user self-mixing is avoided; secondly, the water culture rooting period is accurately designed, the synergistic effect of phosphorus, calcium and biological stimulants is strengthened, so as to improve the rooting quality and speed; finally, the product is completely water-soluble, has no precipitation and does not block, is safe, has good antibacterial performance, and effectively improves the use performance of the liquid fertilizer.