74 results about "Residual phosphorus" patented technology

The present invention relates to a simple and economically attractive process for the pretreatment of vegetable oils which involves (a) enzymatic degumming with commercially available phospholipase A1 from the sources like Aspergillus oryzae microorganism, (b) bleaching of the enzymatically degummed oil using bleaching earth and activated carbon, and (c) dewaxing (in case of rice bran oil) of degummed and bleached oil at lower temperature to obtain oil with less than 5 ppm of residual phosphorus which is amenable for physical refining.

The invention relates to a positive flotation method of low grade refractory phosphate ores. The method comprises the following specific steps: 1. crushing and grinding ores: grinding raw ore according to the grinding density of 1:1 to -0.074mm of 55-60% tailings discarding fineness; 2. performing positive flotation: firstly, roughing, namely adding depressant sodium carbonate, big modulus sodiumsilicate and collector ZJ oleic acid composite, stirring to obtain roughing concentrate, roughing middlings and roughing tailings; secondly, concentrating, namely adding big modulus sodium silicate in the roughing concentrate to perform 3-4 times of concentrations and obtain concentrating middlings and phosphorus product concentrate; thirdly, scavenging, namely adding ZJ oleic acid composite in the roughing tailings to perform 2-3 times of scavengings and obtain scavenging middlings and tailings; and 3. regrinding and reprocessing, namely further dissociating ores, and reprocessing to obtain tailings and residual phosphorus concentrate. The invention is characterized in that the ore grinding cost is low, the dosage of reagents is low, the ZJ oleic acid composite is easy to prepare and is convenient to use, the separating effect of phosphorus ores and gangue mineral is obvious, the separation indexes are good, etc; and the method is especially suitable to be used in the flotation of silicon-poor deposition-calcium phosphorite type phosphate ores with a concentration of P2O5 of less than 20%.

The spectrophotometric process of measuring the residual phosphate amount in polybenzoazole fiber or film includes the following steps: dissolving the polybenzoazole fiber in strong protonic acid, adding precipitant to precipitate polymer, collecting phosphoric acid solution, adding alkali to regulate solution pH to neutrality, adding molybdate, regulating with acid matter to proper acidity for color development reaction, adding reductant to convert the measured component into colored compound and final absorbency measurement. The process has simple instrument used, simple operation, high feasibility and high precision, and may be used in lab and factory.

The invention relates to a gradient technology method for wet process phosphoric acid production. Phosphate ore acidolysis digestion includes three stages, wherein the first stage is a quick reaction stage, the second stage is a stable reaction stage, and the third stage is a solid grain growing stage; in the quick reaction stage, hyperphosphate mixed acid solution of which the molar ratio of phosphoric acid to sulfuric acid is 1:0.5-1:1 is added; in the stable reaction stage, high-sulfur mixed acid solution of which the molar ratio of phosphoric acid to sulfuric acid is 0:1-0.5:1 is added; in the grain growing stage, the temperature of a crystallization tank is lowered, calcium sulphate dihydrate crystal in ardealite is accelerated to form particles with a large particle size; residual phosphorus content in the ardealite is smaller than 1.9%. According to the method, ground phosphate rock digestion time is shortened by 50%, the residual phosphorus content in the obtained ardealite can be lowered by 20% or more, and a filtering rate can be improved by 30% or more.

The invention discloses a method for removing and recycling high-concentration Ca<2+> and Mg<2+> in garbage leachate MBR and NF concentrate. According to the method, phosphate radicals are used to react with Ca<2+> and Mg<2+> in the MBR and NF concentrate to produce a precipitate mixture, and then solid-liquid separation is carried out to effectively remove Ca<2+> and Mg<2+>; moreover, the content of residual phosphate radicals in a supernatant obtained after precipitation is low; and sediment can be used as a raw material for water-soluble fertilizer containing humic acid after dissolving by nitric acid, so reclamation is realized. The method is advanced, practical and economic, has simple flow, uses simple equipment, occupies a small area of land and does not pose secondary pollution.

The invention discloses a method for measuring the residual phosphorus content in wet process phosphate phosphorus gypsum. The method comprises the following operation steps of (1) taking wet phosphorus gypsum samples; performing water washing to the neutral state; then, transferring the materials into a beaker; next, adding hydrochloric acid; heating the materials to a slight boiling state; cooling the materials to the room temperature; then, transferring the materials to a volume bottle; maintaining the constant volume; uniformly shaking the materials; directly performing filtering without washing; (2) sucking partial filter liquid into the breaker; adding dilute nitric acid; heating the materials to be about to boil; taking down the breaker; adding quimociac precipitators during stirring; slowing heating the materials until the upper layer solution is clear and bright; (3) taking down the breaker; performing still standing and cooling to room temperature; then, performing filtering; washing precipitates to be neutral; drying the precipitates; cooling the precipitates in a drier to the room temperature; performing weighing; calculating the mass percentage of phosphorus pentoxide in the sample. The method has the advantages that little low-concentration hydrochloric acid is used for replacing lefort aqua regia to realize the extraction of residual phosphorus in the phosphorus gypsum. The method provided by the invention has the advantages that the acid types are few; the consumption is low; the environment pollution and the equipment corrosion are low; the energy is saved; the time is saved, and the like.

The invention relates to the technical field of sewage treatment and particularly discloses a combined efficient dephosphorization treatment method of waste water. The treatment method comprises the following steps: feeding a magnesium source into the waste water containing nitrogen and phosphorus to form a struvite sediment, performing primary separation to form low-concentration phosphorus-containing waste water, continuing to feed an iron source and a flocculant into the separated waste water to form a polyferric sediment, performing secondary separation to form waste water containing a little residual phosphorus, and continuing to feed steel slag into the separated waste water to form a phosphorus attached steel slag sediment, wherein the waste water after the secondary separation canreach a secondary phosphorus-containing emission standard; and the waste water after the tertiary separation can reach a primary phosphorus-containing emission standard. The method employs an organiccombination of a struvite sedimentation method, a polyferric sulfate dephosphorization method, a flocculation sedimentation method and a steel slag absorption dephosphorization method, achieves the purpose of efficient dephosphorization of the waste water, and ensures that the treated waste water can discharged to reach the standard; at the same time, the struvite sediment and the polyferric sediment are collected, dried and crushed and become an agricultural slow-release fertilizer; and resource utilization of phosphorus in the waste water is achieved.

The invention discloses a method for synchronously degumming and deacidifying phospholipase and lipase. The method is characterized by adding the phospholipase, the lipase and phytosterol into soybeancrude oil simultaneously to obtain a synchronous degumming and deacidifying optimum response parameter; the method can be used for simultaneously removing phospholipids and free fatty acid in the soybean crude oil and generating phytosterol ester; under the technological process, the degumming and deacidifying effects of soybean oil are relatively good, the residual phosphorus content of the soybean oil is 10.5mg/kg, the acid value is 1.510mgKOH/g, and the phytosterol ester content is 1.657g/100g. The method can be used for reducing the refining working procedures of the soybean oil, the refining time is reduced, the oxidation degree of grease is lowered, meanwhile, the functional soybean oil rich in the phytosterol ester can be obtained, the functionality and oxidation resistance of thegrease are increased, and the economic benefit of grease industry is improved.

The invention relates to a continuous activated carbon washing and drying device. The continuous activated carbon washing and drying device comprises a carbon slurry supplying device, a belt-type filter, a blanking hopper, a vacuum absorption and filtration device, a vacuum tank, a washing and spraying device and pipelines for connection, wherein the running direction of the belt-type filter is taken as the criterion, the carbon slurry supplying device is arranged at the front upper part of the belt-type filter; the blanking hopper is arranged at the rear lower part of the belt-type filter; the washing and spraying device is arranged above the belt-type filter; the lower part of the belt-type filter is provided with the vacuum tank which is connected with the belt-type filter through a pipeline and is also connected with the washing and spraying device as well as the vacuum absorption and filtration device. The device washes (extracts) phosphoric acid which is the residual of phosphoric acid liquids with different gradients in clearances of activated carbon, meanwhile dehydrates washed activated carbon by adopting a vacuum negative pressure suction filtration mode, and reduces the residual phosphorus quantity of the activated carbon which is collected by acid pickling so as to further reduce the consumption quantity of phosphoric acid in activated carbon production; dehydrating is conducted by adopting a vacuumizing mode, so that the dehydrating efficiency of activated carbon is improved.

The invention discloses a phosphate-solubilizing bacterium, a phosphate-solubilizing bacterium agent and a biological bacterial fertilizer, and application thereof. A phosphate-solubilizing bacteriumstrain XQP53 is Burkholderia with an accession number of CCTCC M: 2020254. The phosphate-solubilizing bacterium XQP53 can improve the ground diameter, the plant height and the chlorophyll content of corn, enhance soil nutrients, increase the contents of neutral phosphatase, water-soluble phosphorus and sodium bicarbonate inorganic phosphorus in soil, reduce the content of residual phosphorus in soil, and promote the conversion of active-state and low-activity-state phosphorus in soil into active-state phosphorus. The phosphorus-solubilizing bacterium agent XQP53 has the effects of promoting corn growth, improving soil nutrients and converting phosphorus, and has application value in plant production.

A process is disclosed for recovering elemental phosphorus from an aqueous sludge and converting the residue into non-hazardous waste. The sludge is separated into (1) a slurry of water containing suspended phosphorus and dirt particles and (2) coarse solids. A flocculating agent is added to the slurry to agglomerate the suspended phosphorus and dirt particles, which are recovered from the water and are heated to melt elemental phosphorus particles. A coalescing agent is added to coalesce the melted elemental phosphorus, which is separated from the dirt particles. The coarse solids are mixed with hot water to melt the phosphorus sludge, which is separated from inert solids. The solids are heated to burn any residual elemental phosphorus. The separated molten phosphorus sludge is stirred with a solution of chromic acid to recover the phosphorus as a separate phase. A reducing agent is added to the remaining water and solids to reduce the Cr<+6 >to Cr<+3>. Finally, an alkali is added to the water and solids to react the residual phosphorus and form phosphorous compounds. The reaction mass is filtered and the filter cake can be placed in a landfill as a non-hazardous waste.

The invention discloses an organophosphorus wastewater treatment process. The process comprises the following steps: S1, pumping organophosphorus wastewater into a filter by a pump, and filtering outsolid impurities in the organophosphorus wastewater by a filter; S2, filling a catalytic oxidation system with a catalytic oxidation filler in advance; S3, pumping the organophosphorus wastewater subjected to solid impurity removal into the catalytic oxidation system, pumping active oxygen water into the catalytic oxidation system, reacting the catalytic oxidation filler and the active oxygen water to generate hydroxyl free radicals, and quickly converting organophosphorus in the organophosphorus wastewater into phosphates by the hydroxyl free radicals; and S5, pumping the treated liquid in the catalytic oxidation system into a plate-and-frame filter press to obtain a filter cake and a clear liquid, pumping the clear liquid into an advanced treatment system filled with resin, adsorbing residual phosphorus in the clear liquid by the resin, and detecting the total phosphorus content of phosphates in the clear liquid to be 0.5mg/l. The process has the advantages that the total phosphoruscontent of phosphates in the wastewater can be reduced to 0.5mg/l, the treatment procedures are few, and the treatment effect is good.

The invention discloses a concentration and flow control method used in recovery of diluted phosphoric acid by virtue of a phosphoric ore pulp filter device. The concentration and flow control method comprises the following implementation steps: detecting a diluted phosphoric acid P2O5 concentration, a reaction slurry P2O5 concentration and the height of a liquid level in a diluted phosphoric acid collection tank of the phosphoric ore pulp filter device; respectively converting the diluted phosphoric acid P2O5 concentration and the reaction slurry P2O5 concentration into a fuzzy set by virtue of a predetermined subordinating degree function, carrying out fuzzy inference and defuzzification calculation by virtue of a predetermined fuzzy rule list to obtain the opening of a filtrate acid electric regulating valve, converting the opening into current signals and inputting to the filtrate acid electric regulating valve; converting the reaction slurry P2O5 concentration and the height of the liquid level into the opening of a diluted phosphoric acid electric regulating valve, converting the opening into current signals and inputting to the diluted phosphoric acid electric regulating valve. By virtue of the concentration and flow control method, the stability of process indexes can be effectively improved, the filtration effect of the reaction slurry is improved, the residual phosphorus in phosphogypsum is decreased and the environmental pollution is reduced, the automation degree is high and the operation is simple and reliable.

The invention relates to an aluminum oxidation wastewater treatment method and a method for preparing ferric phosphate from wastewater. The treatment method comprises the following steps of taking water from mixed discharged phosphoric acid-containing wastewater in an aluminum oxidation process, adding alkali liquor to perform neutralizing adjustment, setting the pH value to 2.4-3.0, adding a certain amount of ferric salt into a secondary stirring tank, adding an oxidizing agent, and performing stirring and mixing in the stirring tank to generate ferric phosphate precipitate; and after separation, obtaining ferric phosphate with relatively high purity, neutralizing clear liquid with lime milk, controlling the pH value to 9.5-10.5, performing secondary precipitation, precipitating residualphosphate radicals in a calcium phosphate mode, meanwhile precipitating aluminum, fluorine and nickel ions in waste liquid synchronously, further performing mud-water separation, adding quantitative sodium hypochlorite into the clear liquid, performing aeration, oxidizing ammonia nitrogen in water, performing blowing-off, and enabling the pH value of outlet water to be 7-9. The final outlet watercan reach the national emission standard through treatment, and phosphate is effectively recovered in a precipitation mode.

The invention relates to a preparation method of a powdered phosphorite or smashed phosphorite adhesion agent and a production method of a formed ore and belongs to the technical field of comprehensive mineral resource utilization. The powdered phosphorite or smashed phosphorite adhesion agent is prepared by taking an industrial by-product mainly comprising silicon oxide as a raw material and adding caustic soda and a catalyst. The adhesion agent and powdered phosphorite or smashed phosphorite are subjected to disc balling and calcining to form raw material, namely the formed ore, for production of yellow phosphorus by an electric furnace method. According to the methods, a production process is simple; equipment is mature; the investment is low; the methods are convenient to operate; theformed ore is high in strength; tail gas not subjected to any purification treatment can be used as a heat source; the cost is low; at the same time, a reduction rate of the phosphorus can also be increased; a residual phosphorus content in slag is reduced; and the method is particularly applicable to the characteristic that the future production of the yellow phosphorus by the electric furnace method takes a washed ore as a raw material.

A method for synchronous phosphorus removal and turbidity removal of thickened sludge water comprises the following steps: stirring at high speed to perform homogenization treatment on sludge flocs in the thickened sludge water; adding a flocculating agent into the thickened sludge water subjected to homogenization treatment to realize quick flocculation; performing coagulation reaction on the thickened sludge water subjected to flocculation reaction to realize further densification of particle sludge produced in the coagulation reaction; performing solid-liquid separation on muddy water mixture subjected to densification, discharging the particle sludge through a spiral conveyor, collecting treated water through a collecting tank and further removing residual phosphorus in the water through adsorption to finally enable the outlet water to meet the discharge standards. The invention further provides a device for synchronous phosphorus removal and turbidity removal of the thickened sludge water. By the method and the device provided by the invention, the synchronous phosphorus removal and turbidity removal effect on the thickened sludge water in a sewage treatment plant is realized, the treatment cost is low, the treatment efficiency is high and the consumed time is short.

A method for effectively treating organic matter and nutriments such as nitride and phosphide in wastewater. The treatment comprises follow parts of: a settling tank for separating sand and debris in wastewater by deposition; an anaerobic tank comprising a simple and contact aeration tanks for denitrification of returned sludge in which the nitrogen is converted from ammonia (NH4) to nitrite (NO3) by oxidation, with a carbon source of feeding wasterwater in anaerobic condition to convert nitrogen element to nitrogen gas by adding a denitrogenation oxidation bacterium and discharging the nitrogen gas to air; a biopond equipped with a biomake and an aeration device for activating microorganisms and supplying activated microorganisms into the simple and contact aeration tanks; the simple aeration tank for decomposing organics and for converting ammonia (NH4) to nitrite (NO3); the contact aeration tank for decomposing residual organics and for converting residual ammonia (NH4) to nitrite (NO3) by microorganisms attached to media; a sedimentation tank for settling sludge and for removing residual phosphorus by using coagulation; and a concentration tank for deposited sullage dehydrating to improve concentration.