33results about "PH-change processes" patented technology

The present invention describes an integrated system, apparatus and method for de- alkalizing lignocellulosic material and producing bioproducts. Particularly, the system produces de-alkalized lignocellulosic feedstock which can be used in various downstream bioproducts, such as formation of biofuel, biogas and biochemicals. Among others, the system comprises a slurry-making subsystem for combining lignocellulosic pre-treated particles with a water mixture comprise of water and a chemical agent to obtain a slurry; an ultrasonic treatment subsystem for the disruption of cellular structures, loosening of lignocellulosic matrix, removing and neutralizing alkali at the cellular level of the lignocellulosic material in the slurry; a hydrodynamic cavitation subsystem for high-shear mechanical breakdown of the lignocellulosic material at the cellular level in the slurry; and a direct steam injection subsystem in connection with the slurry-making subsystem and / or the hydrodynamic cavitation subsystem to achieve hydrostatic cavitation and alkali neutralization in the slurry.

A method and system for converting copper cyanide to copper oxide is provided. The method includes contacting a copper cyanide solution with an acidic solution in a precipitation tank under reaction conditions sufficient to produce a copper cyanide slurry, removing the copper cyanide slurry from the precipitation tank, separating solid copper cyanide from the copper cyanide slurry in a first separation device, removing the solid copper cyanide from the first separation device, contacting the solid copper cyanide with a sodium hydroxide solution in a production tank under reaction conditions sufficient to produce a copper oxide slurry, removing the copper oxide slurry from the production tank, separating solid copper oxide from the copper oxide slurry in a second separation device, and removing from the second separation device any residual sodium hydroxide not reacted during the process of contacting the solid copper cyanide with the sodium hydroxide solution in the production tank.

This invention provides a production process for manufacturing metallic magnesium and industrial silicon by decomposing serpentine using the hydrochloric acid method. [Solution] The present invention provides a method for processing serpentine ore as a raw material using a two-stage countercurrent hydrochloric acid leaching process. The wet process steps include storage and filtration of the slurry after ore dressing, two-stage hydrochloric acid leaching under atmospheric pressure, washing and filtration of the silicon slag after leaching, removal of iron and nickel precipitation from the leaching solution, separation, washing and filtration of the obtained iron hydroxide and nickel hydroxide, crystallization and evaporation of the magnesium chloride solution, and production of hydrochloric acid using the gas generated after the thermal decomposition of magnesium chloride. The present invention has developed a serpentine decomposition technology using hydrochloric acid, a metallic magnesium production process using a drying-electrolytic method, and a process for producing industrial silicon by smelting silicon slag in an electric furnace.

The invention discloses a multi-stage separation and resource extraction sludge treatment system, which comprises a pretreatment unit, a grading separation unit, a resource extraction unit, a tail gas treatment unit and a circulation regulation mechanism, the pretreatment unit comprises a sludge receiving bin, a slurrying device and a crushing device, the fractional separation unit comprises a solid-liquid separation device, an organic matter extraction device and an inorganic matter extraction device, the resource extraction unit comprises a heavy metal recovery device and a phosphorus extraction device, and the heavy metal recovery device and the phosphorus extraction device are communicated with the inorganic matter extraction device through pipelines. The tail gas treatment unit comprises a waste gas collection pipeline and a waste gas purification device, and the circulating adjustment mechanism comprises a device body, a circulating pump and a flow divider valve. The multi-stage separation and resource extraction sludge treatment system provided by the invention has the advantages of high sludge separation efficiency and sufficient resource recovery.

Microbeads capable of controlling the pH of a sample are provided. The microbeads can control the pH of a sample to be equal, similar or close to a target pH without an automated device and the like such as an additional valve system for controlling pH, and thus could be readily applied to fields requiring pH control.

The purpose of the present invention is to provide an alkaline subcritical water composition, a water-containing composition, a device, and a container which are capable of inhibiting corrosion of a reaction device and capable of decomposing a polymer and the like. The present disclosure is an alkaline subcritical water composition having a pH of 13.7 or less and a potential of 400 mV or more when a current density exceeds 10 mA / cm2 in an anodic polarization curve in which a steel material is used in a test electrode.

The present invention relates to an integrated system, apparatus, and method for dealkalization of wood cellulose materials and production of bio-based products. In particular, the system generates dealkalized wood cellulose raw materials that can be used as raw materials for various downstream bio-based products. The system includes a slurry generation subsystem that combines pre-treated particles of wood cellulose material with a water mixture containing water and chemical agents to obtain a slurry; an ultrasonic treatment subsystem that breaks down the cellular structure of the wood cellulose material in the slurry, relaxes the wood cellulose matrix, and removes and neutralizes alkali at the cellular level; a hydrodynamic cavitation subsystem that decomposes the wood cellulose material in the slurry at the cellular level using high shear mechanical decomposition; and a direct steam injection subsystem connected to the slurry generation subsystem and / or the cavitation subsystem to achieve hydrostatic cavitation and alkali neutralization in the slurry.

A method for manufacturing a positive electrode active material precursor comprises a nucleation step of forming nuclei of the precursor in a first reactor; and a nucleus growth step of growing the nuclei formed in the nucleation step in a second reactor, wherein the volume of the second reactor is larger than the volume of the first reactor.

The disclosure pertains to an ammonium nitrate reactor with a first type static mixer in the mixing zone upstream of the tube bundle and / or a second type static mixer downstream of the tube bundle.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The invention discloses a magnetic particle filtering system for electronic grade polyethylene glycol production, and belongs to the technical field of polyethylene glycol production process improvement, the magnetic particle filtering system comprises a reactor, a front filtering device is arranged at the front end of the reactor, the front filtering device is connected with the reactor through a pipeline, and the front filtering device comprises a filtering unit A and a filtering unit B; the filter unit B is connected to the filter unit A in parallel through a pipeline. The filter screen adopts a cylindrical filter screen, the bottom of the cylindrical filter screen is of a net-shaped closed structure, the upper part of the cylindrical filter screen is of an opening structure with a diagonal plane, and a feed port is higher than the front end of the upper part of the cylindrical filter screen and lower than the rear end of the upper part of the cylindrical filter screen; the rear end of the upper part of the barrel-shaped filter screen is higher than the front end of the upper part of the barrel-shaped filter screen, so that non-metal impurities in ethylene glycol can be more comprehensively intercepted, the flux of an ethylene glycol solution is increased, the filtering speed of ethylene glycol is increased, and the filtering efficiency is improved.

Provided is a method for producing a lithium-containing solution that allows suppressing production cost for lithium production by suppressing solution amount after an adsorption step, increasing a lithium content rate in the lithium-containing solution, and suppressing amount of solution used in a step after a manganese oxidation step. The method for producing a lithium-containing solution performs the adsorption step, an eluting step, and an manganese oxidation step in this order. In the adsorption step, an anion-exchange resin is used together with the lithium adsorbent. This aspect allows hydrogen ions generated in the adsorption step to be adsorbed by the anion-exchange resin, thereby promoting an adsorption reaction. Therefore, the solution amount after the adsorption step can be suppressed, the lithium content rate in the lithium-containing solution increases, the amount of the solution used in the step after the manganese oxidation step is suppressed. This allows suppressing production cost for lithium production.

A method for preparing metallic magnesium and industrial silicon by decomposing serpentine with hydrochloric acid is provided. Serpentine is used as a raw material, and is processed by a two-stage countercurrent leaching process in a hydrochloric acid system. A hydrometallurgical process is adopted, including beneficiation, wet grinding, slurry storage, filtration, two-stage atmospheric pressure hydrochloric acid leaching, washing and filtration of leached silica slag, iron removal and nickel precipitation from a leachate, separation, washing and filtration of a ferric hydroxide precipitate and a nickel hydroxide precipitate, crystallization and evaporation of a magnesium chloride solution, and hydrochloric acid preparation from a flue gas generated after thermal decomposition of magnesium chloride. The present disclosure develops a process of decomposing serpentine with hydrochloric acid and producing metallic magnesium by a drying-electrolysis method, and a process of producing industrial silicon by smelting silica slag in an electric furnace.

The invention relates to an ammonium nitrate reactor with a first type of static mixer in a mixing zone upstream of a tube bundle and / or with a second type of static mixer downstream of the tube bundle.

What is provided is stannous oxide having an α-ray emission amount of 0.002 cph / cm2 or less after heating in an atmosphere at 100° C. for 6 hours. Tin containing lead as an impurity is dissolved in a sulfuric acid aqueous solution to prepare a tin sulfate aqueous solution, and lead sulfate is precipitated in the aqueous solution and removed. While stirring the tin sulfate aqueous solution from which lead sulfate has been removed, a lead nitrate aqueous solution containing lead having an α-ray emission amount of 10 cph / cm2 or less is added to cause lead sulfate to be precipitated in the tin sulfate aqueous solution, and simultaneously the tin sulfate aqueous solution is circulated while removing the lead sulfate from the aqueous solution. A neutralizing agent is added to the tin sulfate aqueous solution to collect stannous oxide.

The present invention relates to a precursor preparation device and a precursor preparation method. The precursor preparation device for preparing a precursor by co-precipitating a raw material, according to the present invention, comprises: a co-precipitation reaction tank in which accommodation materials including a reactant and a filtrate are accommodated; and a pH measurement system for measuring the pH of the filtrate, wherein the pH measurement system comprises: a filter which is positioned inside the co-precipitation reaction tank, and which filters out the filtrate from the accommodation material; and a pH measurement unit positioned outside of the co-precipitation reaction tank so as to measure the pH of the filtrate filtered out through the filter.

The disclosure pertains to an ammonium nitrate reactor with a first type static mixer in the mixing zone upstream of the tube bundle and / or a second type static mixer downstream of the tube bundle.

An apparatus and method for preparing a precursor are described. The apparatus for preparing the precursor is an apparatus for preparing a precursor, which coprecipitation reacts a raw material to prepare the precursor, the apparatus including: a coprecipitation reaction tank in which an accommodated material including a reactant and a remainder is accommodated; and a pH measuring system that measures a pH of the remainder. The pH measuring system includes: a filter that is disposed inside the coprecipitation reaction tank and filters the remainder from the accommodated material; and a pH measuring part that is disposed outside the coprecipitation reaction tank to measure the pH of the remainder filtered through the filter.

The invention relates to the technical field of lithium fluoride preparation, and discloses a high-purity lithium fluoride preparation system which is characterized in that a solution preparation module is respectively communicated with a precipitation preparation module and a tail gas treatment module and is used for preparing a lithium hydroxide solution and conveying the lithium hydroxide solution to the precipitation preparation module; the precipitate preparation module communicates with the solution preparation module, the purification module and the tail gas treatment module and is used for preparing lithium fluoride precipitates and conveying the lithium fluoride precipitates to the purification module; the purification module communicates with the precipitate preparation module, the drying and roasting module and the tail gas treatment module and is used for purifying the lithium fluoride precipitate and conveying the lithium fluoride precipitate to the drying and roasting module; the tail gas treatment module is used for purifying tail gas generated by the receiving solution preparation module, the precipitation preparation module and the purification module and then discharging the tail gas out of the system. The system can improve the purity of the lithium fluoride product and the stability among batches, optimize the process flow, reduce the energy consumption, realize environment-friendly standard emission, and achieve multiple targets of improving the product quality, improving the production efficiency and protecting the environment.

The invention discloses a novel seed crystal for a crystallization fluidized bed, the molar ratio of Al to Fe to Si in the seed crystal is (1.2-2.0): (1.5-2.5): (1.0-1.5), and the particle size distribution is concentrated in 50-200 [mu] m. The preparation method comprises the following steps: S1, preparing aluminum salt into an aluminum salt solution; preparing ferric salt into a ferric salt solution; diluting silicate into a silicate solution; s2, adding an aluminum salt solution and an iron salt solution into a reaction kettle, heating and stirring, dropwise adding a silicate solution, and regulating and controlling the pH value of the system to form uniform flocculent precipitates; s3, heating the reaction kettle, stirring, and curing; reducing the temperature and the stirring speed, and adding a crystal form directing agent; monitoring particle size distribution in the curing process to obtain a seed crystal suspension; and S4, carrying out hydraulic cyclone classification on the seed crystal suspension, and carrying out vacuum filtration, washing and drying on the classified seed crystal to obtain the product. The crystallization efficiency can be greatly improved, the hardness removal effect of the crystallization fluidized bed is remarkably improved, and the method has a good application prospect.

The invention discloses a cow gall bile acid production and preparation device and a preparation method, and relates to the technical field of bile acid preparation. According to the cow gall bile acid production and preparation device and the preparation method, cow gall thick pieces are transferred into the constant-temperature tank from the unfreezing chamber capable of blocking dust to be unfrozen through the material supporting mechanism, the pressurizing mechanism is in linkage fit with the material supporting mechanism, and the cow gall thick pieces can be subjected to inclined sliding, rubbing and extruding between the filter plate and the baffle; the operation of sliding, rubbing and extruding bile can prevent separation of cattle gall meat scraps, and when the pressurizing mechanism and the material supporting mechanism are matched to achieve reciprocating motion and high-frequency vibration is utilized to extrude cattle gall thick pieces, unfreezing can be accelerated, and bile can be fully extruded out. The pressure for filtering and removing impurities in the follow-up process can be reduced through bile extrusion operation for preventing meat and scrap separation, meanwhile, residues can be automatically guided out when the material supporting mechanism moves to the residue discharging opening, and it is guaranteed that the preparation device can reduce mixing of meat and scrap impurities during bile acid production.

The invention discloses solid hydrogen production equipment containing a microchannel structure, which comprises a shell (1), a solid hydrogen production reactor structure (2) is arranged in the shell (1), a cold water inlet pipe (4) and a hot water inlet pipe (3) are respectively arranged at the lower end of the solid hydrogen production reactor structure (2), and a gas outlet pipe (6) is arranged at the upper end of the solid hydrogen production reactor structure (2); the solid hydrogen production reactor structure (2) comprises a plurality of hydrogen production modules (7) which are stacked and distributed up and down, end plates (8) are arranged outside the hydrogen production modules (7) at the two ends, and the two ends of the two end plates (8) are connected through a screw rod (9); the hydrogen production module (7) comprises a sealing gasket (71), a first rhombus net (72), a magnesium felt (73), a second rhombus net (74) and a micro-channel assembly (75) which are sequentially distributed; and water which reacts with the solid hydrogen production reactor structure is also stored in the shell (1), and the pH value of the water is 2-5. The method has the characteristic of simplicity and convenience in hydrogen production.

The invention relates to the technical field of extraction of lithium from salt lake brine, in particular to a method and device for preparing lithium carbonate, and the method comprises the following steps: adjusting the pH value of a high-concentration lithium chloride mother solution, and heating to a set temperature to obtain a pretreated high-lithium mother solution; filtering and refining the lithium precipitation agent through a precision filter, and heating the lithium precipitation agent to a set temperature through a tubular heat exchanger to obtain a refined lithium precipitation agent; feeding the pretreated high-lithium mother liquor and a refined lithium precipitation agent into a crystallizer for mixed reaction to obtain reaction slurry; washing the reaction slurry to obtain washing waste liquid and a dehydrated material; drying and packaging the dehydrated material to obtain lithium carbonate; collecting overflow liquid and washing waste liquid to form mixed waste liquid; carrying out extraction and reverse extraction enrichment treatment on the mixed waste liquid to obtain an enriched lithium chloride solution; feeding the enriched lithium chloride solution into a reaction kettle to participate in the pretreatment in the step S3; the lithium carbonate product obtained by the method has the advantages of low impurity content, high quality stability and high lithium recovery rate.

The invention belongs to the technical field of automatic filling, particularly relates to an automatic filling system for hydrochloric acid as a byproduct of monochlorodifluoromethane, and aims to solve the problems that in the prior art, a special hydrochloric acid barrel needs to be manually carried to a filling station and manually positioned, and a gland needs to be manually operated to complete sealing after filling is completed, so that time and labor are wasted, and potential safety hazards exist. According to the technical scheme, the equipment comprises a working table, supporting legs are fixedly connected to the four corners of the bottom of the working table, a plurality of conveying wheels are rotationally connected to the top side of the interior of the working table, a power mechanism is arranged in the working table, the equipment further comprises a machining box and an acid-resisting storage tank, the acid-resisting storage tank is arranged at the top of the working table, and the acid-resisting storage tank is fixedly connected to the top of the machining box. According to the device, automatic feeding can be conducted, a cover can be automatically covered for sealing after filling is completed, meanwhile, alkali liquor spraying neutralization can be immediately triggered once hydrochloric acid leakage is detected, and practicability and safety are improved.

The present invention provides an optimized method for recovering high-purity lithium carbonate from a lithium-containing composite oxide such as lithium silicate, lithium aluminum oxide, or lithium aluminum silicate deposited on an erosion surface of a discarded waste sagger. Therefore, when the method for producing high-purity lithium carbonate from a waste sagger of the present invention is used, it is expected not only to be able to produce high-purity lithium carbonate that can be used for manufacturing lithium secondary batteries by recycling a discarded waste sagger, but also to be able to recycle a positive electrode active material, iron oxide, alumina, silicate, calcium carbonate, and the like obtained as by-products during the production process of the lithium carbonate.

The invention relates to the technical field of hydrolyzed sponge, and discloses a hydrolyzed sponge refining process and application, the process comprises the following steps: raw material pretreatment, natural sponge raw material selection, artificial grading and impurity removal, direct hydrolysis after impurity removal, dilute acid hydrolysis, and putting the pretreated raw material into an acid-resistant reaction container, the preparation method comprises the following steps: adding a dilute acid solution with the mass fraction of 1%-5%, carrying out a stepped hydrolysis reaction at the temperature of 50-90 DEG C for 6-12 hours, filtering and cleaning, and carrying out a hydrolysis process with sectional temperature control and auxiliary treatment with a surfactant during refining processing of the hydrolyzed sponge spicule, so as to obtain the hydrolyzed sponge spicule. According to the method, the microstructure integrity and biological activity of the sponge spicule can be effectively reserved, meanwhile, proper hydrolysis parameters are set according to sponge raw materials from different sources, the controllability of the refining process of the sponge spicule is guaranteed, the purity and quality stability of the product are improved, and a material foundation is laid for subsequent application.

A manufacturing method for a positive electrode active material precursor according to an embodiment of the present invention comprises: a nucleation step of forming a nucleus of the precursor in a first reactor; and a nucleus growth step of growing the nucleus, formed in the nucleation step, in a second reactor. The second reactor has a greater capacity than the first reactor.

A method and system for converting copper cyanide to copper oxide is provided. The method includes contacting a copper cyanide solution with an acidic solution in a precipitation tank under reaction conditions sufficient to produce a copper cyanide slurry, removing the copper cyanide slurry from the precipitation tank, separating solid copper cyanide from the copper cyanide slurry in a first separation device, removing the solid copper cyanide from the first separation device, contacting the solid copper cyanide with a sodium hydroxide solution in a production tank under reaction conditions sufficient to produce a copper oxide slurry, removing the copper oxide slurry from the production tank, separating solid copper oxide from the copper oxide slurry in a second separation device, and removing from the second separation device any residual sodium hydroxide not reacted during the process of contacting the solid copper cyanide with the sodium hydroxide solution in the production tank.

A method for manufacturing a positive electrode active material precursor includes: a nucleation step of forming a core of a precursor in a first reactor; and a nucleus growth step of growing the nucleus formed in the nucleation step in a second reactor, in which the volume of the second reactor is greater than the volume of the first reactor.

The present invention provides an optimized method for recovering high-purity lithium carbonate from lithium-containing compounds such as lithium silicate, lithium aluminum oxide, and lithium aluminum silicate deposited on the eroded surface of waste refractory crucibles to be discarded. Therefore, by using the method for producing high-purity lithium carbonate from waste refractory crucibles of the present invention, not only can the waste refractory crucibles to be discarded be recycled to produce high-purity lithium carbonate that can be used in the production of lithium secondary batteries, but it is also expected that the positive electrode active material, iron oxide, alumina, silicate, calcium carbonate, etc. obtained incidentally in the production process can also be recycled.