7results about "Raw phosphate material treatment" patented technology

The invention relates to a method for separating phosphorus and / or phosphorus compounds from phosphorus carriers and / or phosphate carriers containing iron (oxide), the method comprising at least the following steps: a) fusion metallurgical reduction of the phosphorus carriers and / or phosphate carriers containing iron (oxide) by forming slag melts and a melt of iron phosphides, in particular FeP, Fe2P and / or Fe3P; and b1) oxidation of the melts of iron phosphides in the presence of Ca carriers and Al carriers in order to form gaseous P2O5 and lime-aluminium-iron compounds, in particular brownmillerite; and / or b2) fusion metallurgical reaction of the melts of iron phosphides in the presence of elemental sulfur and / or sulfur carriers in order to form iron sulfides and elemental phosphorus; and / or b3) oxidation of the melts of iron phosphides in the presence of oxygen at a temperature of at least 1100°C in order to form iron oxides and P2O5.

The present application relates to the technical field of water treatment, and discloses a chemical flocculation process for deep phosphorus removal of phosphorus-containing wastewater, which comprises the following steps: synchronously feeding the phosphorus-containing wastewater and a polyaluminum chloride solution into a high-frequency shearing reaction zone, adjusting the shearing rate and the hydraulic retention time, adding hydrogen ions according to the alkalinity of the wastewater to maintain the pH at 4.5-5.5, so as to form a multi-core hydroxyl complex; introducing the fluid into a secondary reaction zone, inducing the pH transition and homogeneous nucleation by jetting an alkaline regulator, and using the generated primary microflocs to capture phosphate to form a phosphorus-rich complex; and separating and collecting the precipitate. The present application changes the phosphorus removal mechanism from physical entrapment to chemical coordination bonding by interfering with the hydrolysis path of aluminum salt, simultaneously improves the phosphorus grade of the precipitate during deep phosphorus removal, and makes the precipitate have the secondary mineral resource recovery value, so as to achieve the resource comprehensive utilization of the wastewater treatment process.

The present application relates to a method for recovering phosphorus and aluminum from lithium iron phosphate battery lithium extraction waste residue, the preparation method comprising the following steps: (1) mixing lithium iron phosphate battery lithium extraction waste residue and alkali liquor, after the first leaching reaction, obtaining phosphorus aluminum leaching solution and leaching residue; (2) mixing the phosphorus aluminum leaching solution obtained in step (1) with calcium salt, after reaction, obtaining aluminate solution and phosphorus-rich residue. The present application extracts the phosphorus and aluminum components in lithium iron phosphate battery lithium extraction waste residue simultaneously, obtaining recyclable aluminate solution and phosphorus-rich residue, wherein the P2O5 content in the phosphorus-rich residue is ≥30%, which can be directly used as high-grade phosphate ore for wet-process phosphoric acid production. Through the above recovery steps, the recovery rate of phosphorus and aluminum elements both reaches more than 92%, realizing the high-value utilization of lithium iron phosphate battery lithium extraction waste residue; the recovery process and equipment are relatively conventional, the operation is simple and easy to implement, and it has strong practicality.

The application discloses a phosphorus ore powder cold-pressing balling method based on a phosphogypsum-based binder, first, constant-temperature drying and specification pulverization treatment are performed on phosphorus ore powder and phosphogypsum-based composite binder raw materials, then, even mixed wet materials are prepared by using a dry-wet two-stage frequency conversion stirring combined with a dynamic moisture optimization compensation program. After the mixed wet materials are filled into molds, gradient pre-pressing, forced pressure maintaining and linear slope pressure releasing programs are performed to prepare high-density compacted blocks, and the blocks are placed in a closed environment to perform temperature and humidity coupling maintenance to accelerate hydration crosslinking. After the maintenance, the blocks are subjected to torque monitoring frequency conversion crushing and machine vision feedback speed control rounding treatment, double-layer screening technology is adopted to intercept finished products, and different-diameter materials are subjected to closed-loop backflow reprocessing. The method realizes efficient and collaborative consumption of industrial solid wastes such as phosphogypsum, significantly reduces balling energy consumption and cost, and the prepared product has very high cold-state mechanical properties and high-temperature residual strength, and solves the industry problem that phosphorus ore powder cannot be directly used for yellow phosphorus electric furnace smelting.

The application discloses a method for removing organic matter from phosphate ore and a preparation method of wet-process phosphoric acid, and belongs to the technical field of wet-process phosphoric acid. The method comprises the following steps: S1: ball milling the phosphate ore, wherein the solid-liquid ratio is 1:2.8-3.2, and the particle size is 60-70% of the size that can pass through a 200-mesh screen; S2: performing acidolysis on the phosphate ore slurry after ball milling, reverse acid, concentrated sulfuric acid and filtrate from step S3, wherein the mass ratio of the phosphate ore, the reverse acid and the concentrated sulfuric acid is 1:2.2-2.50:0.10-0.25, and the reaction temperature is 70-80 DEG C; the reverse acid is from an extraction process, and the density of the phosphate ore slurry after acidolysis is controlled to be 1.22-1.28 g / cm 3 ; S3: sending the phosphate ore slurry after acidolysis to a flotation column, performing multi-stage flotation column flotation to control the content of organic matter to be less than a predetermined value; collecting the floating scum of the flotation column, performing solid-liquid separation on the floating scum, sending the filtrate to step S2, and sending the filter residue to step S1 after calcination.

The present disclosure provides a process for producing low-fluoride dicalcium phosphate. The process involves selecting phosphate rocks with variable phosphorus contents, treating the selected phosphate rocks with hydrochloric acid at a low pH to produce phosphoric acid and other compounds, adding calcium carbonate aqueous mixture to the reaction product to form insoluble calcium fluoride, separating the insoluble calcium fluoride from the mixture, forming dicalcium phosphate at a specific pH, and separating it by filtration. The addition of calcium carbonate is controlled by using calcium carbonate aqueous solutions of specific concentration of calcium carbonate to increase the precipitation process and control the fluoride content. The process results in a dicalcium phosphate product with a low fluoride content and high P / F ratio.