39results about How to "Avoid coprecipitation" patented technology

The invention discloses a method for fractionation of soybean 7S globulins and 11S globulins of low phytic acid, which comprises the following steps of: dissolving degreased soybean meal in 10-20 times weight of water, controlling pH value, extracting and separating at the room temperature to remove bean dregs and then obtain a soybean protein extracting solution; adjusting the pH value of the soybean protein extracting solution to 3.0-6.8 in weak acid, adding phytase, carrying out enzyme treatment for 5 minutes to 3 hours at the temperature of 20-70 DEG C to obtain an enzymolysis protein solution; adding a calcium or magnesium ion precipitator in the enzymolysis protein solution, controlling the concentration of calcium or magnesium ions in the enzymolysis protein solution to 5-25mM, adjusting pH to 5.8-6.8, and carrying out centrifugal separation on fractions containing the 7S globulins and fractions containing the 11S globulins. The method disclosed by the invention has the advantages of realizing the accurate separation of the insoluble 11S globulins and the soluble 7S globulins in the higher pH value condition and obtaining two components capable of obviously reducing the content of phytic acid.

The invention relates to a preparation method of a chemical adsorption material for removing phosphorus containing substances in wastewater, and belongs to the field of wastewater treatment. The preparation method includes the steps: firstly, grinding magnesite into powder and generating deposits after acid washing and alkaline leaching; mixing the deposits with 3-4% of polymerized organic polyacrylonitrile, 15-20% of polycaprolactam and 3-4% of diammonium nitrogen-based benzene solution of foaming agents; and generating the adsorption material with free Mg2+ under the pressure of 2.0-3.0MPa and at the temperature of 90-100 DEG C. Firstly, the adsorption material is soaked by phosphoric acid and then placed into an adsorption tower by serving as packing; secondly, the wastewater containing ammonium ions flows through the adsorption tower and chemically reacts with the adsorption material in the packing tower; and finally, white crystalline magnesium ammonium phosphate is generated. The influence of side reaction is avoided by the adsorption material, phosphate deposits with high purity are obtained, and secondary pollution caused by a traditional precipitation method is avoided.

The invention discloses hydroxylation iron catalyst, and a preparation method and the application thereof, which relates to solid catalyst and the preparation method thereof. The invention solves the problems existing in the prior multiphase catalytical ozonized water treatment process that the catalytic activity of the catalyst is low, the stability is poor, and the secondary pollution is caused by the stripping of the metal ion. The hydroxylation iron catalyst of the invention is made of dissoluble ferric iron salt solution and alkali solution according to the mol ratio of 1: 3 to 4 of Fe<+3> and OH<-> and by adopting the homogeneous precipitation method, the invention is used for treating drinking water by catalytical ozonizing. The method of the invention is simple and convenient for operation, and the crystal form of the particle of the obtained product is complete, uniform and dense, and the distribution of the particle diameter is uniform. The catalyst of the invention can remove the organic pollutant difficult to be degraded in drinking water by catalytical ozonizing within the range of the pH equal to 4 to 10; the high activation of the catalyst is high and the capacity of removing trace amount of organic pollutant difficult to be degraded is strong; the stability is high, and the catalyst is uneasy to be digested and can be recurrently used to reduce the cost, and is uneasy to cause the secondary pollution.

The invention relates to a method for producing zinc oxide by utilizing zinc-containing raw ore. The method comprises a primary extraction step, an optional purification step, a pre-treatment step, azinc precipitation step, a primary calcination step, a secondary extraction step, a pressurizing and crystallization step, a decompression and decomposition step, an optional rinsing step and a secondary calcination step. According to the method disclosed by the invention, wet-process leaching and a synthesis technology are combined to realize economical and environment-friendly utilization of low-grade zinc oxide ore and an applicable range is wide; ammonia steaming is not needed and the method is simple and feasible; the energy consumption of a technology is greatly reduced; high-temperatureand high-pressure potential safety hazards and equipment corrosion problems, which are caused by the ammonia steaming, are also avoided; the problems of technological recovery rate and high-quality product grade are solved; the pollution is small and materials are recyclable; the synthesis of calcium zincate under a zinc-ammonia environment is realized for the first time; a zinc oxide product isproduced through the calcium zincate; decomposition conditions of ammonium carbonate are creatively utilized in the technology and cyclic utilization of carbon dioxide is realized through pressure difference.

The invention relates to a method for producing zinc oxide by utilizing zinc-containing raw ore. The method comprises an extraction step, an optional purification step, a decarburization step, a calcium zincate synthesis step, an optional rinsing step, a calcination step and a calcium and zinc separation step. According to the method provided by the invention, wet-process leaching and a synthesistechnology are combined to realize economical and environment-friendly utilization of low-grade zinc oxide ore and an applicable range is wide; ammonia steaming is not needed and the method is simpleand feasible; the energy consumption of a technology is greatly reduced; water treatment pressure, high-temperature and high-pressure potential safety hazards and equipment corrosion problems and thelike, which are caused by the ammonia steaming, are also avoided; the environment protection problem in an ammonia circulating problem that surplus water is brought by steam so that the balance of technological water is influenced is solved, and the problems of technological recovery rate and high-quality product grade are solved; the pollution is small and auxiliary materials are recyclable; thesynthesis of calcium zincate under a zinc-ammonia environment is realized for the first time; a zinc oxide product is produced through the calcium zincate.

The invention discloses a method for selectively removing and recovering copper in water by using a membrane-assisted crystallization process, and the process is composed of two crystallization reactors which are operated in series and a membrane reactor. In order to ensure the purity of a precipitate and facilitate recovery and reutilization of Cu < 2 + >, Na2CO3 and Cu2(OH)CO3 are used as a precipitant and a seed crystal respectively (only 0.1-0.5wt% is added once at startup). Nucleation and crystal growth the Cu < 2 + > in the water mainly occur in the crystallization reaction. A membrane module in a membrane separator is mainly used for further crystallization and solid phase concentration. Under optimal process conditions, the Cu < 2 + > in the water is finally recycled in the form ofCu2(OH)CO3 crystal particles, and the purity is as high as 99%. Two key parameters of the operation of the process are: supersaturation index (SI <3.22) and excess carbonate (35mg/L <CO3<2-> <50mg/L), and the dosing amount of the precipitant can be adjusted according to effluent water quality requirements, so that the method has the advantages of saving resources and reducing costs, and has positive significance for promoting sustainable development of society.

The method relates to a method for producing a compound containing zinc by utilizing raw ore containing zinc. The method comprises the steps of digestion, optional purification, decarbonization, calcium zincate compounding, optional rinsing and calcination. According to the method for producing the compound containing zinc by utilizing the raw ore containing zinc, hydrometallurgical leaching is combined with a compounding technology; economical and environmentally-friendly utilization of ultralow-grade zinc ore is achieved; the application range is wide; ammonia distillation is not needed; themethod is simple and easy to be implemented; technological energy consumption is lowered greatly; multi-aspect problems such as water treatment pressure caused by ammonia distillation, potential safety hazards of high temperature and high pressure, equipment corrosion and the like are also avoided; the environmental problem confronted that technological water balance is influenced by surplus water volume brought in by the steam in ammonia circulation technology is solved; the problems with technology recovery rate and quality grade are solved; pollution is little; auxiliary materials can be recycled; compounding of calcium zincate in a zinc-ammonia environment is achieved for the first time; and the compound containing zinc is acquired via calcium zincate.

The invention discloses a method for synchronously separating and extracting a scattered element tellurium and metal copper from cuprous telluride slag, and belongs to the field of nonferrous metallurgy. According to the method, a chlorine-containing composite oxidizing agent is added into an alkaline system to conduct selective oxidation leaching on tellurium in the cuprous telluride slag, the main components of the leaching slag are copper oxide and cuprous oxide, and the leaching slag can be returned to a copper smelting system to recycle metal copper; and the pH value of the tellurium-containing leachate is adjusted by using inorganic acid to precipitate and recover tellurium in the form of TeO2, thereby realizing synchronous separation and extraction of tellurium and copper. The chlorine-containing composite oxidizing agent is adopted for alkaline leaching of the cuprous telluride slag to separate and recover tellurium and copper, the method has the advantages of being high in tellurium and copper recovery rate, simple in process, low in cost and the like, and short-process efficient comprehensive recovery of the cuprous telluride slag can be achieved.

The invention relates to a method for producing nano zinc oxide by utilizing leaching residues of a zincic acid electrolysis method. The method comprises a primary extraction step, an optional purification step, a desulfurization step, a calcium zincate synthesis step, a primary calcination step, a secondary extraction step, a pressurizing and crystallization step, a decompression and decomposition step, an optional rinsing step and a secondary calcination step. According to the method disclosed by the invention, secondary utilization of the leaching residues is realized when environmental protection problems are solved; resource utilization is realized when various types of heavy metal pollution are solved; sulfate ions which are considered as a pollution source are changed into valuablethings through calcium sulfate transformation; the synthesis of the calcium zincate under a zinc-ammonia environment is realized for the first time; the nano zinc oxide is obtained through the calciumzincate; ammonia steaming is not needed and the method is simple and feasible; the energy consumption of a technology is greatly reduced; high-temperature and high-pressure potential safety hazards and equipment corrosion problems, which are caused by the ammonia steaming, are also avoided; decomposition conditions of ammonium carbonate are creatively utilized in the technology and cyclic utilization of carbon dioxide is realized through pressure difference.

The invention relates to a method for preparing nano calcium zincate from zinc-containing raw ores. The method comprises the steps of digestion, optional purification, carbon removal, calcium zincatesynthesis, optional rinsing and drying. The method combines wet-process leaching and the synthesis technology, ultralow grade zinc ore economical and environment-friendly utilization can be achieved,the application range is wide, no ammonia distillation is needed, the method is easy and convenient to implement, the energy consumption of the technology is greatly lowered, water treatment pressurecaused by ammonia distillation, high-temperature and high-pressure potential safety hazards, equipment corrosion and other problems are further avoided, the environment-friendly problem that the balance of process water is affected due to the fact that steam is brought into remaining water in the ammonia circulation technology is solved, the purposes of high technology recycling rate and high quality good level are achieved, contaminations are low, auxiliary materials can be recycled, and synthesis of nano calcium zincate under the zinc ammonia environment is achieved for the first time.

The invention relates to a method for preparing zinc oxide by using zinc-contained raw ores. The method comprises a primary leaching step, an optional purifying step, a decarbonization step, a calciumzincate synthesis step, a primary calcining step, a secondary leaching step, a pressing crystallization step, a decompression decomposing step, an optional rinsing step and a secondary calcining step. The method combines wet leaching with the synthesis process, so that the economical and environment-friendly utilization of low-grade zinc ores is realized, the application range is wide, the ammonia evaporation is not needed, both convenience and feasibility are achieved, the energy consumption of the process is greatly reduced, the high-temperature and high-pressure potential safety hazards and the equipment corrosion problem caused by the ammonia evaporation are prevented, the process recovery rate and the finish product grade problem are solved, and the pollution is low; auxiliary materials can be recycled; the synthesis of calcium zincate under a zinc ammonia environment is realized for the first time; zinc oxide products are prepared by calcium zincate; the decomposition conditionsof ammonia carbonate are creatively used; and the recycling of carbon dioxide is realized through pressure difference.

The invention discloses a preparing method of a light-degraded organic poisonous gas multi-stage nanometer composite. The preparing method includes the steps of preparing porous lamellar nanometer montmorillonite, smashing the montmorillonite through a mechanical smashing method and a gas flow method until the average particle size is 50-200 nm, primarily preparing the nanometer composite, compounding the montmorillonite and a titanium-series photocatalysis material at a low temperature to obtain a compound, adding the compound to water or alcohol for low-temperature reaction, adding a nitrogen source or carbon source for reaction to obtain a primary nanometer composite, modifying the multi-stage nanometer composite, cooling the primary nanometer composite, and then adding a modifier for modifying the composite, wherein the modifier accounts for 0.2-2% of the total mass of the compound, the water or alcohol and the nitrogen source or carbon source, and the modifier comprises glycerol or triethanolamine.

The invention relates to a method for utilizing zinc-containing raw ore through the strontium zincate synthesis step, comprising the following steps: leaching, optional purification, decarburization,strontium zincate synthesis, optional rinsing, drying or calcining. The invention realizes the synthesis of strontium zincate in a zinc ammonia environment; the reaction selectivity for synthesis of strontium zincate from zinc ammonia complex-ions is high, and the synthesis is simple and fast; and the high added-value product is prepared economically and environmentally from the low-grade raw orewhich is hard to deal with. The method of the invention has a wide range of application, and can effectively extract and utilize various forms of zinc-containing raw ore and enrich the zinc element through the strontium zincate synthesis route, thereby solving problems of process recovery rate and quality product grade. The product obtained by the method can be directly used as a product, and alsocan be used as an industrial raw material.

The invention relates to a method for purifying phosphoric acid raffinate and recovering magnesium ammonium phosphate hexahydrate. According to the technical scheme, the method for purifying the phosphoric acid raffinate and recovering the magnesium ammonium phosphate hexahydrate comprises the steps that, water is added to the phosphoric acid raffinate according to the mass ratio of the phosphoricacid raffinate to water of 1 to (0.1-0.3), the mixture is stirred at room temperature for 0.5-1h, and the diluted phosphoric acid raffinate is obtained; and urea is added to the diluted phosphoric acid raffinate according to the mass ratio of the urea to the diluted phosphoric acid raffinate of (0.5-2) to1, the mixture is stirred at a temperature of 70-100 DEG C until a pH value is 5-6, the mixture is cooled, subjected to solid-liquid separation and washed to obtain iron-removing aluminum liquid and an iron-containing aluminum residue; and then the iron-removing aluminum liquid is stirred at70-100 DEG C until a pH value is 6-7, the iron-removing aluminum liquid is cooled, subjected to solid-liquid separation and washed to obtain a phosphoric acid raffinate purifying solution and the magnesium ammonium phosphate hexahydrate. The method for purifying the phosphoric acid raffinate and recovering the magnesium ammonium phosphate hexahydrate has the characteristics of short process flow,small phosphorus loss and easy recycling of metal ions.