97results about "Raw phosphate material treatment" patented technology

The invention relates to a phosphorite wet processing method, and belongs to the technical field of chemical engineering. The phosphorite wet processing method comprises the following steps: A, phosphorite acid leaching: carrying out acidolysis leaching on a phosphorite raw material, and carrying out solid-liquid separation to obtain wet-process phosphoric acid; b, removing metal ions from wet-process phosphoric acid; and C, wet-process phosphoric acid defluorination: extracting fluosilicic acid in wet-process phosphoric acid at 10-70 DEG C by adopting a wet-process phosphoric acid defluorination extraction agent, and carrying out phase splitting to obtain defluorinated purified phosphoric acid and an organic phase loaded with fluosilicate. According to the invention, high-value utilization of low-grade phosphorite resources is realized. According to the method, impurities can be fully removed, the loss rate of phosphoric acid is low, the purity of the finally obtained phosphate product reaches 97% or above, the product quality is high, and the requirements of different fields for high-quality phosphate can be met. The method is simple in process, low in energy consumption and low in cost.

The present invention relates to a method for decomposing and utilizing phosphate-potassium ore, belonging to the technical field of phosphate-potassium ore treatment. The technical problem solved by the present invention is to provide a method for decomposing and utilizing phosphate-potassium ore. The method comprises the following steps: mixing nitric acid and phosphate-potassium ore, and carrying out an acidolysis reaction; after the reaction is completed, performing solid-liquid separation to obtain a phosphorus-containing filtrate and potassium-containing acid-insoluble substances; wherein, the leaching rate of potassium in the phosphate-potassium ore is ≤3%, and the leaching rate of phosphorus is ≥96%. The present invention for the first time uses nitric acid to treat phosphate-potassium ore, controls the reaction conditions of the acidolysis process to reduce the leaching rate of K element, realizes the separation of phosphorus and potassium elements, avoids the problem that potassium fluorosilicate precipitates and clogs the filter cloth during vacuum filtration and cooling, perfectly avoids the disadvantages of the traditional wet-process phosphoric acid for treating phosphate-potassium ore, and has rich products.

The invention discloses a method for improving phosphorite reaction activity and fluorine resource recovery rate. The method mainly aims at medium-low-grade collophanite after flotation, and comprises the following steps: firstly, pretreating phosphorite by using fluosilicic acid to prepare high-concentration phosphorite slurry; carrying out premixing reaction on the phosphoric ore pulp and phosphoric acid, and then carrying out crystallization reaction with sulfuric acid with a certain concentration; a flash cooling and flue gas washing system is arranged in each reaction area, so that escape and recovery of fluorine are enhanced; and after the reaction is finished, filtering and washing to obtain phosphoric acid and phosphogypsum. The phosphorite is pretreated by using low-concentration fluosilicic acid recovered in a phosphoric acid concentration section, the phosphorite pre-decomposition pH is adjusted by using fluosilicic acid, carbonate, silicate and quartz impurities in the phosphorite are preferentially dissolved, and micro-channels are formed on the surfaces of phosphorite particles, so that the subsequent use amounts of phosphoric acid and sulfuric acid are reduced, and the content of aluminum phosphate ions in the product is reduced; the phosphorite acidolysis efficiency is improved. Meanwhile, introduction of fluosilicate accelerates escape of fluorine in phosphorite, and the fluorine yield of the system is increased.

The present invention discloses a phosphorus recovery blast furnace for lithium iron phosphate recovery slag, and relates to the technical field of iron phosphate recovery. It comprises a blast furnace, wherein recovery pipes are fixed on both sides of the top of the blast furnace, and heat storage mechanisms are fixed on both sides of the bottom of the blast furnace, wherein the heat storage mechanism comprises two temperature-resistance shells, the two temperature-resistance shells are located on both sides of the blast furnace, and the two are symmetrical to each other, a heat-insulating shell is fixed on the inner wall of the temperature-resistance shell, and an air inlet pipe is fixed on one side of the outer wall of the temperature-resistance shell. The present invention adds a heat-insulating shell and a heat-conducting bend pipe to the heat-storage mechanism through the arrangement of the heat-storage mechanism. When recovering phosphorus from the lithium iron phosphate recovery slag, the heat-conducting bend pipe can quickly make the air temperature reach a predetermined temperature value due to its large number of curved surfaces. At the same time, the heat-insulating shell can reduce the loss of heat from the air, thereby improving the rate of phosphorus recovery from the lithium iron phosphate recovery slag, reducing the use cost of the hot blast furnace, and reducing air pollution.

The invention relates to a wet-process phosphoric acid production process for phosphorite all-element resource comprehensive utilization, and belongs to the field of phosphorus chemical industry production. The process comprises the following steps: decomposing phosphorite, a decomposition solution and a base solution to obtain a primary decomposition solution and primary decomposition slag; crystallizing the primary decomposition liquid to obtain ammonium dihydrogen phosphate crystals and crystallization mother liquor thereof; ammonium dihydrogen phosphate is directly sold as a product or transformed to produce high-quality phosphoric acid, and the obtained crystallization mother liquor is returned to be used for preparing a decomposition solution or a decomposition base solution; transforming the primary decomposition slag by ammonium bicarbonate to obtain an ammonium sulfate solution and a calcium carbonate filter cake; returning the ammonium sulfate solution for preparing decomposition liquid or comprehensively utilizing; transforming the calcium carbonate filter cake through ammonium chloride to obtain a mixed gas containing CO2 and NH3, a calcium chloride solution and insoluble filter residues; the calcium chloride solution further produces a calcium-containing compound. According to the process provided by the invention, the phosphogypsum can be consumed from the source, the consumption of sulfuric acid is low, the fluorine leaching rate is high, the comprehensive utilization rate of calcium resources is high, and the quality of phosphoric acid obtained through transformation is good.

The invention discloses a pretreatment method for recycling phosphorus in sludge, which is characterized in that the sludge is subjected to reduction treatment by adopting aerobic biological decomposition drying, phosphorus is screened and fixed, and then phosphorus is recycled through pickling, the pretreatment method for recycling phosphorus in sludge is provided, the method is simple to operate, the cost is low, and the method is suitable for industrial production. The sludge is subjected to reduction treatment, resource recovery of phosphorus in the sludge is realized, and the problem of environmental pollution caused by loss of phosphorus in wastewater is prevented.

The invention relates to a method for synergistically recycling a photovoltaic waste material and a waste lithium iron phosphate battery positive electrode material, and belongs to the technical field of recycling of photovoltaic waste materials and waste lithium iron phosphate. According to the method, the photovoltaic waste and the waste lithium iron phosphate battery positive electrode material are used as raw materials, and under the vacuum condition, silicon (Si) in the photovoltaic waste is used for reducing the waste lithium iron phosphate battery positive electrode material to generate lithium silicate slag (Li2SiO3 and Li2Si2O5), elemental phosphorus (P4) and ferrosilicon alloy (Si-Fe). According to the method, valuable components in the photovoltaic waste and the waste lithium iron phosphate battery positive electrode material are effectively utilized, and efficient separation and recycling of lithium, iron, phosphorus and silicon are achieved; and the recovery process is simple.

The present invention recovers resources such as phosphorus from a product such as a used nonaqueous electrolyte battery that contains a nonaqueous electrolyte solution. This resource recovery method for recovering resources from a cleaning liquid that is generated when a product which contains a nonaqueous electrolyte solution is disassembled and cleaned comprises: an acid treatment step (step S2) for adding an acid to the cleaning liquid and heating the same; and a step (step S3) for adding a pretreated layered hydroxide to the cleaning liquid after the acid treatment step. The pretreatment applied to the layered hydroxide includes applying a heat treatment to the layered hydroxide.

The invention relates to the technical field of sludge calcination, in particular to a method for regulating and controlling a phosphorus phase in a sludge calcination product by utilizing kaolinite. The invention discloses a method for regulating and controlling a phosphorus phase in a sludge calcined product by utilizing kaolinite. The method comprises the following steps: calcining a mixture of kaolinite and sludge in a certain proportion at 600-700 DEG C for 2-4 hours; in the mixture, the mass ratio of kaolinite is 8-10%. The kaolinite is added to be pyrolyzed and calcined with the sludge, under the synergistic effect of proportion, temperature and the like, phosphorus phase reconstruction in the calcined sludge product is regulated and controlled, the total phosphorus (TP) preservation amount is increased, and phosphorus in the sludge is converted into a form which has higher recovery value, higher bioavailability and is easier to extract subsequently, especially apatite-state phosphorus (AP); the phosphate fertilizer is stable in chemical property and moderate in solubility, and is a source of high-quality phosphate fertilizer or phosphorus chemical raw materials.

The utility model discloses a kiln for extracting phosphorus steam from phosphate ore, which comprises a kiln body, and a preheating section, a heating section and a cooling section are sequentially arranged in the kiln body along the length direction; the rails are symmetrically arranged in the kiln body and extend in the length direction of the kiln body. At least one of the preheating section and the cooling section is provided with a phosphorus discharge port, and the phosphorus discharge port is communicated with an external phosphorus steam collecting device; in the phosphorus steam preparation process, the materials are in a static state, the phosphorus steam purity in the reaction process is high, smoke and impurities do not exist, safety and environmental protection are achieved, the operation cost is low, the automation degree is high, and trolley running, temperature control and pressure control can be automatically controlled through a computer in a central control room in the whole process.

The invention relates to a method for recovering silicon in the form of silicon tetrachloride, in which biochar having a silicon content of at least 1% by weight, expressed as% by weight of elemental silicon, is reacted with elemental chlorine at a temperature of 350 to 900 DEG C and the formed silicon tetrachloride is separated from the exhaust gas stream, preferably by condensation.

The present invention relates to a process for producing a phosphate concentrate from an ore containing magnesium, iron and phosphate, and the process comprising the steps of reacting the ore with water and an amphoteric surfactant, thereby providing a first concentrate containing magnesium, iron and phosphorus; in the first low-gradient magnetic separation step, phosphorus and iron in the first concentrate are separated; and collecting a second concentrate comprising phosphorus and a third concentrate comprising iron from the first separation step. The method is characterized in that it further comprises the steps of: classifying the particles in the second concentrate according to a specified cut-off particle size; in a second high-gradient magnetic separation step, further separating phosphorus from magnesium and iron in the classified particles with the particle size smaller than the cut-off particle size; collecting a fourth concentrate comprising phosphorus and a fifth concentrate comprising magnesium and iron from the second separation step; and mixing the particles of the second concentrate, the particle size of which is equal to or higher than the cut-off particle size, with the fourth concentrate, thereby obtaining the phosphate concentrate. The present disclosure further relates to a system for performing the method of the present disclosure.

This invention discloses a method for producing ammonium salts from calcined phosphate tailings, comprising the following steps: S1, calcination of phosphate tailings; S2, stirring leaching; S3, high-intensity stirring filtration; The mixed solution in step S2 is subjected to high-intensity stirring to address the problem of increased material viscosity caused by magnesium dissolution, and pressure is applied to improve the filtration effect and productivity, forming filtrate and filter residue; S4, classification and treatment of filtrate and filter residue; Ammonia and carbon dioxide are added to the filtrate for stirring and mixing, followed by precipitation, filtration, washing, and drying to obtain light calcium carbonate; Ammonium sulfate solution is added to the filter residue for stirring leaching, followed by decantation and filtration to obtain solution, phosphate concentrate, and waste residue. By utilizing the selectivity of ammonium salts for calcium and magnesium leaching, calcium and magnesium are separated, resulting in a high-purity magnesium product and a low-magnesium, high-phosphate concentrate. This decomposes phosphate tailings into different products, achieving full utilization of phosphate tailings and improving productivity.

Provided herein are systems and methods for producing nitrophosphates and mineralized carbon. Advantageously, the systems and methods are capable of sequestering carbon from the atmosphere. The systems generally include a first reactor for producing nitric acid; a mixer for mixing the nitric acid produced in the first reactor with a phosphate source, thereby producing nitro-phosphoric acid; and a second reactor for producing a solution comprising nitrophosphates and mineralized carbon, wherein the second reactor is operable to receive: the nitro-phosphoric acid from the mixer, ammonia, water, and carbon dioxide.

The present application relates to the inorganic chemical technology field, specifically to a method for using phosphorus tailings for flue gas desulfurization and simultaneously preparing enriched phosphorus concentrate, high-quality calcium sulfate and magnesium hydroxide. The present application uses phosphorus tailings after calcination, ammonium nitrate solvent leaching once to separate calcium and magnesium, and then uses magnesium to remove SO2 in flue gas, which has high desulfurization rate and fast reaction speed. Through the desulfurization process, enriched phosphorus concentrate, high-quality calcium sulfate and magnesium hydroxide are obtained, realizing the perfect combination of flue gas environmental protection desulfurization, comprehensive utilization of phosphorus tailings and high-value-added product manufacturing.

The present invention relates to a method for combined recovery of phosphate and nitrogen from sewage sludge. The core objective of the present invention is to recover phosphorus from sewage sludge ash and convert phosphorus into NP fertilizer diammonium phosphate using steam from sewage sludge drying and nitrogen from liquid manure.

This invention relates to the field of filter aids, specifically to a filter aid and filtration method for acid hydrolysis of phosphate rock using nitric acid. The filter aid is a magnetic carbon filter aid, and its preparation includes the following steps: coarse coal gasification slag is thoroughly mixed with an electrolyte solution containing calcium ions and then ground in a ball mill; the mixture is then transferred to a tubular reactor; the reaction product is then immersed in a solution of alginic acid and amino acid iron, ultrasonically vibrated, and centrifuged to obtain a solid product; the solid product is then further processed in the tubular reactor. During filtration, humic acid is first added to the acid hydrolysis solution, stirred, and allowed to settle for initial pressure filtration to obtain initial filter cake and initial filtrate; then, the magnetic carbon filter aid is added to the initial filtrate, stirred, and allowed to settle for secondary pressure filtration. The filter aid provided by this invention can improve the filtration efficiency of the acid hydrolysis solution, and the filter cake from the initial pressure filtration can be used to produce organic-inorganic mixed fertilizer, purifying the environment; it also lays a foundation for improving the quality of subsequent gypsum.

The application discloses a method for producing phosphorus ore powder pellets by using phosphating waste liquid, which comprises the following steps: uniformly mixing 80-100 parts by weight of phosphorus ore powder, 5-20 parts by weight of heat-treated copper slag powder, 4.8-8.0 parts by weight of water and 8.0-11.2 parts by weight of phosphating waste liquid, pressing the mixture into balls, drying and calcining the balls, and obtaining the phosphorus ore powder pellets; in the method, the acidic components in the phosphating waste liquid are reacted with the aluminum and calcium system substances in the phosphorus ore powder, the iron system components in the smelting copper slag are used as a ball strength enhancer, the P2O5 in the phosphating waste liquid participates in the phosphorus production reaction, the P grade in the powder ball is improved, the comprehensive utilization of the waste liquid and solid waste is realized, and the method has the significance of treating waste with waste and treating pollution with waste.

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 invention discloses a method for recovering rare earths from rare earth-containing phosphate ore and co-producing slow-release fertilizer. The method comprises pretreatment, roasting and activation, composite leaching, multi-stage extraction, stripping and activation, and slow-release fertilizer preparation. In the pretreatment stage, the phosphate ore is subjected to reverse flotation to remove gangue to improve the rare earth grade. In the roasting and activation stage, organic matter and fluorine in the phosphate ore are removed by staged roasting to activate the rare earths. In the composite leaching stage, the phosphate ore is decomposed by a mixed acid + microbial method to maximize the leaching of rare earths and increase the rare earth content in the leachate. In the extraction stage, ionic liquid is used to perform multi-stage extraction of the rare earths to improve the purity of the rare earth product. Finally, the slow-release fertilizer is prepared using the phosphate tailings, acid leaching residue, and insoluble potash ore powder as raw materials, forming a green, economical, and efficient integrated phosphate ore utilization process.

The invention firstly relates to a method for respectively extracting and producing uranium and, where appropriate, heavy metals and rare earths from phosphato-calcium mineral matrices comprising the steps of a) treatment of said phosphato-calcium mineral matrices with a source of fluoride anions; b) heat treatment of said mixture of fluorides in the presence of calcium metal; and c) separation followed by the individual collection of uranium metal and, where appropriate, of heavy metals and rare earths initially present in the starting material. The invention also relates to a series of methods derived from the implementation of the aforementioned and leading, depending on the pathways followed, to the production, respectively, of phosphoric acid, sulfuric acid, ammonium sulfate or NPK fertilizers and more particularly, respectively, of phosphoric acid, sulfuric acid, ammonium sulfate or NPK fertilizers free of metal contaminants. The invention is defined in the claims. Other objectives of the invention will become apparent over the course of the following description, in particular with reference to the reaction schemes illustrated by the figures below.

The invention discloses a method for preparing LDHs (layered double hydroxides) products by activating phosphate tailings through a non-thermal method and by-producing medium-low-grade phosphorite. The method comprises the following steps: adding phosphate tailings and a Lewis acid solution into a reaction kettle, carrying out hydrothermal reaction at 100-150 DEG C, then carrying out solid-liquid separation to obtain medium-low-grade phosphorite and a filtrate containing calcium and magnesium elements, supplementing calcium ions and / or magnesium ions into the filtrate, then adjusting the pH value, and carrying out aging treatment to obtain LDHs products. The method is simple and low in energy consumption, the prepared product is good in quality and performance and high in additional value, no solid waste is generated, and the resource utilization efficiency of the phosphate tailings is greatly improved.

Aiming at the problem of low product strength caused by large porosity in a phosphorite pellet roasting method, the invention discloses a method and a system for fluidized roasting of powdered rock phosphate, and utilizes the technical characteristics that low-grade high-calcium phosphorite pellets are easy to generate pores in the roasting process and the pores can be filled with powdered rock phosphate. Phosphorite micro-powder is added in the middle and later periods of fluidized roasting of the phosphorite pellets for mixed roasting, so that the phosphorite micro-powder is filled into pores of the phosphorite pellets and is fused and attached with the phosphorite pellets into a whole, and the compressive strength of the roasted phosphorite pellets can be remarkably improved; accurate and efficient roasting of low-grade high-calcium phosphate rock powder is met, and the requirement for subsequent pyrogenic process smelting of phosphate rock can be met. The method and the system have the advantages of simple overall process flow, low production cost, compact equipment structure, easiness in control, high production efficiency, stable product quality, high resource utilization rate, convenience in popularization and application and the like.

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 application discloses a wet-process phosphoric acid production process for comprehensive utilization of full-element resources of phosphate rock, and belongs to the field of phosphorus chemical production. The process comprises the following steps: decomposing phosphate rock, a decomposing solution and a bottom solution to obtain a primary decomposing solution and primary decomposing residue; crystallizing the primary decomposing solution to obtain ammonium biphosphate crystals and a crystallization mother liquor of the ammonium biphosphate crystals; directly selling the ammonium biphosphate as a product or transforming the ammonium biphosphate to produce high-quality phosphoric acid, and returning the obtained crystallization mother liquor to preparation of the decomposing solution or the decomposing bottom solution; transforming the primary decomposing residue through ammonium carbonate to obtain an ammonium sulfate solution and a calcium carbonate filter cake; returning the ammonium sulfate solution to preparation of the decomposing solution or comprehensive utilization; transforming the calcium carbonate filter cake through ammonium chloride to obtain a mixed gas containing CO2 and NH3, a calcium chloride solution and an insoluble residue; and further producing calcium-containing compounds from the calcium chloride solution. The process provided by the application can absorb phosphate gypsum from the source, has low sulfuric acid consumption, high fluorine leaching rate, high comprehensive utilization rate of calcium resources, and good quality of the phosphoric acid obtained through transformation.

The invention relates to a process for recycling phosphorus from a phosphorus-containing processing material (1), comprising a process step: - gasifying a phosphorus-containing processing material (1) at a temperature equal to or above 1000°C in order to produce a phosphorus-containing solid (2). The invention further relates to a phosphorus-containing solid (2) obtained by the process and having a lead content of < 120 mg / kg, a cadmium content of < 2 mg / kg, a chromium content of < 50 mg / kg, a nickel content of < 50 mg / kg, a mercury content of < 1 mg / kg and / or a zinc content of < 2500 mg / kg, determined by the measuring method according to DIN 51729-10:2011-04, determined according to the method according to DIN 51729-10:2011-04, and to a use of the phosphorus-containing solid (2) as a starting material for the production of a fertilizer.

A process for separating iron oxide from iron oxide-containing and phosphate-containing slag melts comprises the steps of: providing an iron oxide-containing and phosphate-containing slag melt in a crucible, cooling the hydroxide-containing and phosphate-containing slag melt under oxidizing conditions to form solid magnetite, in particular magnetite in the spinel configuration, wherein the cooling is controlled such that a temperature range of 1600°C to 1420°C is traversed over a period of 5 minutes to 25 minutes, preferably 10 minutes to 20 minutes, and particularly preferably 15 minutes, and separating the solid magnetite formed during the cooling step from the phosphate-containing slag.

Provided is an iron phosphate production method with which iron phosphate can be easily obtained. In a precipitation formation step (S1), an alkali is added to a phosphorus-containing liquid to obtain a precipitate. In a dissolution step (S2), the precipitate is dissolved with an acid to obtain a phosphate solution. In a re-precipitation formation step (S3), an alkali is added to the phosphate solution to obtain a precipitate again. In the re-precipitation formation step (S3), the pH of the phosphate solution is adjusted to be less than 4.0. In the re-precipitation formation step (S3), the pH of the phosphate solution is preferably adjusted such that the purity of iron phosphate in the obtained precipitate is at least 90 mass%. It is preferable to repeat the dissolution step (S2) and the re-precipitation formation step (S3).

The present invention provides a process for the highly efficient utilization of wet-process phosphoric acid slurry and its recovery device, belonging to the technical field of wet-process phosphoric acid preparation, which includes the following steps: S1. Stir the concentrated phosphoric acid slurry in the slurry collection tank evenly, and transport the concentrated phosphoric acid slurry to a filter press through a slurry pump for primary filtration. The concentrated phosphoric acid obtained after filtration is transported to a concentrated phosphoric acid buffer tank through a concentrated phosphoric acid pipeline for the production of high-benefit phosphoric acid products; S2. After the primary filtration is completed, continuously introduce washing water for secondary filtration for 200 - 300 s. Within the first 100 - 140 s, the dilute phosphoric acid enters the dilute phosphoric acid buffer tank; S3. During the remaining time, the filter cloth washing water enters the filter cloth washing water tank; S4. After the secondary filtration, unload the filter residue gypsum, and the filter cloth washing water rinses the filter cloth, and the rinsing liquid enters the rinsing liquid collection tank. This process not only realizes the highly efficient utilization of P2O5 in the slurry, comprehensively utilizes the phosphogypsum residue, truly achieves the complete utilization of the crude phosphoric acid slurry, but also realizes the zero discharge of wastewater during the slurry recovery and treatment process.