18 results about "Dissolution precipitation" patented technology

The invention provides a method for recovering Si, C and TiO2 based on chlorinated waste salt water quenching slag, which comprises the following steps: sequentially carrying out water quenching dissolution, precipitation separation and filter pressing dehydration treatment on chlorinated waste salt to obtain water quenching slag and supernate; adding a dilute acid solution into the water-quenched slag, dissolving, and adding a reducing agent for reaction to obtain slurry; carrying out solid-liquid separation on the slurry to obtain a solid material and filtrate; the filtrate is pumped into a boiling bed separator, the petroleum coke and TiO2 are intercepted by a medium material layer, clear liquid is discharged, then the medium material layer is subjected to backwashing regeneration, and the desorbed petroleum coke and TiO2 are subjected to graded enrichment by a hydrocyclone, so that petroleum coke slurry and TiO2 slurry are obtained. According to the method, TiO2, C and other resources in the water-quenched slag obtained after molten salt chlorination waste salt water quenching are recycled, and the technical problem that in the existing chlorination waste salt resourceful treatment process, Si, C, TiO2 and other resources in the water-quenched slag are wasted is solved.

The invention discloses a portland cement hydration pore size distribution calculation method and a calculation analyzer, and the method comprises the steps: building a dissolution-precipitation reaction rate calculation formula based on a dissolution-precipitation reaction; establishing a porosity calculation method by considering the volume fraction change of reactants and hydration products in the hydration process of the Portland cement, and establishing a theoretical model of the hydration process of the Portland cement under the multi-scale and multi-physical field action of the porosity change; a theoretical model of cement pore size distribution is established based on a relation between product content and cement hydration characteristics and a stacking theory. The invention fully considers the effects of multiple scales and multiple physical fields, provides a calculation and analysis method for the pore size distribution theoretical model of portland cement hydration, has the advantages of accurate analysis result, convenience, high efficiency and the like, and can provide a new thought and a new tool for state analysis of the whole process of portland cement hydration.

The embodiment of the application provides a kind of mineral dissolution precipitation simulation model construction method, device and equipment, it is related to oil and gas field development field, the method is by obtaining shale mineral image and dividing boundary grid, the spatial position of solid-liquid reaction interface is clear, secondly, the calculation formula of net reaction flux is determined by combining reactant property parameter and preset rate reaction rule, the consumption of hydrogen ion of unit area solid-liquid interface is quantified, the two reactions of dissolution and precipitation are distinguished by the positive and negative of net reaction flux, then the volume source term representing the hydrogen ion consumption intensity of unit grid volume is derived based on net reaction flux, then the volume source term is integrated into the preset distribution function evolution equation to obtain the simulation model, the hydrogen ion migration process and the mineral dissolution and precipitation process caused by hydrogen ion are integrated into the same simulation system to operate synchronously, eliminate the simulation deviation caused by only single simulation mineral dissolution in prior art, improve the accuracy of mineral dissolution and precipitation simulation.

The invention discloses a wax recovery treatment method which comprises the following steps: stirring, dissolving and precipitating wax in a sodium hydroxide solution to obtain supernate; adding the supernatant into boric acid, stirring to obtain jelly, filtering the jelly, washing, and drying to obtain a dried substance; mixing and stirring the dried substance and methanol, and drying to obtain a wax solid substance; and purifying the wax solid with a distillation extract of petroleum ether. According to the method, impurities in the wax are effectively removed, and the recovery purity and quality of the wax are improved, so that the service life of the wax is prolonged, the production cost is reduced, and the aims of saving resources and protecting the environment are fulfilled.

The invention discloses a sodium bismuth titanate-based relaxor ferroelectric ceramic material and a preparation method thereof. The chemical formula of the ceramic material is y [(1-x) Bi < 0.5 > Na < 0.5 > TiO < 3-x > Ba < 0.7 > Sr < 0.3 > TiO < 3 >]-(1-y) Ba (Mg < 1 / 3 > Nb < 2 / 3 >) O < 3-z > wt% MO, 0.4, 0.5 < = y < lt >; 1, 0lt; z < = 10; mO is an acidic, amphoteric or low-melting-point oxide; according to the invention, by introducing Ba0. 7Sr0. 3TiO3 and Ba (Mg1 / 3Nb2 / 3) O3, the relaxation characteristic of a system is enhanced, and relatively high energy storage density and efficiency are obtained; particle rearrangement is promoted by using a cold sintering process, atomic clusters or ions in a saturated state can be migrated to pore positions with relatively low chemical potential in a dissolution-precipitation process, the densification process of a ceramic system is remarkably promoted, and the prepared ceramic shows excellent dielectric temperature stability and energy storage efficiency.

The invention discloses a parameter acquisition method and system for a reactive seepage dissolution and precipitation process and a medium. Relates to the technical field of geological storage. Carrying out a reactive seepage test, and collecting image data and seepage pressure data in real time; preprocessing the image data, and analyzing and calculating the variation of precipitation pixel points and the precipitation amount in the reactive seepage process; inputting the variation of the precipitation pixel points and the seepage pressure data into a constructed precipitation parameter relation model to obtain precipitation process parameters; according to the scheme, a carbon dioxide geological storage project is guided based on the precipitation process parameters, and real-time calculation of the porosity and the permeability in the reactive seepage dissolution precipitation process is realized based on a constructed precipitation parameter relation model through real-time image acquisition and real-time pressure monitoring of a reactive seepage test; the method has the advantages of being easy to operate, few in process, low in cost, high in precision and good in timeliness.

The present application relates to the technical field of ore powder dissolution precipitation, and particularly relates to a settling device for ore liquid standing separation. The present application comprises a shell and a settling inclined plate, the shell is internally provided with the settling inclined plate, a feeding port is opened at the top of the shell and is connected with a feeding pipe, a discharging port is opened at the bottom of the shell and is connected with a slurry discharge pipe, a magnetic grid plate is arranged directly above the settling inclined plate, a cooling pipe is further arranged in the shell, and an ultrasonic longitudinal wave generator is arranged at the top of the shell. The settling plate can increase the settling area, the magnetic grid plate increases the speed of ore powder particle settling through the magnetic field attraction to metal particles, the magnetic grid plate generates and controls the magnetic field through the energized coil, the cooling pipe is used for cooling the high-temperature ore liquid, slows down the movement of ore powder particles and increases the precipitation rate of ore powder particles, and the ultrasonic longitudinal wave generator improves the mutual coagulation effect of ore powder particles by sending ultrasonic waves to the ore liquid, so as to accelerate the settling speed of the tiny ore powder.

The invention discloses a zero-emission pretreatment system and method for re-separating by-product carnallite, and the pretreatment system comprises a carnallite crushing mechanism which is used for carrying out rough crushing on carnallite contained in a ton bag; the screening mechanism is used for screening coarse broken products, one part of the screened products are sent into the primary dissolving mechanism, and the other part of the screened products are sent back to the carnallite crushing mechanism; the primary dissolving mechanism is used for dissolving and precipitating the screened carnallite to obtain supernate; the dissolving mechanism is used for fully dissolving and diluting the supernate again; the filtering mechanism is used for filtering the solution obtained by the dissolving mechanism. According to the pretreatment system and method provided by the invention, the carnallite of the coal plant can be effectively and fully treated and dissolved, the water inlet index requirement of the salt separation device is met, the load of a filter membrane in the salt separation device is reduced, scaling and pollution blockage of the filter membrane are avoided, and the salt separation treatment efficiency is improved.

The invention belongs to the technical field of silicon dioxide production, and particularly relates to a high-light-transmittance silicon dioxide production process. The process comprises the following steps: mixing preheated low-iron solid water glass with process water containing sodium hydroxide, carrying out steam pressure-maintaining dissolution for 45-65 minutes, precipitating and deslagging, adding a nonionic surfactant, diluting into dilute water glass by using the process water, filtering, continuously adding the dilute water glass and concentrated sulfuric acid into a precipitation reaction kettle to obtain a silicon dioxide suspension with a certain solid content, and carrying out vacuum drying on the silicon dioxide suspension. And aging, washing, drying and ball-milling to obtain the product. The light transmittance of the silicon dioxide product prepared by the process is greater than 75%, and the silicon dioxide product has excellent properties such as BET 190-210 m < 2 > / g and the like; the dissolving process is optimized, the single-batch period is shortened, the energy consumption is reduced, and the cost is reduced by 0.3-0.8% per thousand jin; undissolved particles are reduced by repeatedly adding water and controlling the dissolving time, the dispersibility is improved by adding the surfactant, the continuous operation is realized, the solid content of the suspension is controlled, and the product consistency and the production stability are improved.

The application discloses a kind of implementation dissolution-precipitation dynamic coupling's saline aquifer CO2 mineralization storage pore scale numerical simulation method, comprising: constructing geometric model under pore scale;The flow velocity distribution and pressure distribution of geometric model in time and space are calculated;Reaction migration model of the CO2 mineralization storage of saline aquifer is constructed;Kinetics reaction rate equation and porosity dynamic evolution equation are established, ion product-solubility product judgment statement is introduced, the reaction migration model is solved, and CO2 deep saline aquifer mineralization storage reaction migration numerical simulation is completed.The application is coupled by DBS equation and ADE equation, realizes the solution reaction migration numerical simulation under pore scale, simplifies the complex reaction migration numerical simulation solving process;In the process of solving reaction migration, dissolution and precipitation process are coupled simultaneously, more close to real situation;It is suitable for operation under a variety of working conditions, extracts solute transport and dissolution-precipitation rule under different conditions, and provides support for experimental research.

The invention relates to a characterization method for molecular weight and molecular weight distribution of crystalline polyaryletherketone, and belongs to the technical field of material characterization methods. The problem that molecular weight characterization is difficult due to the fact that crystalline polyaryletherketone is difficult to dissolve in common solvents is solved. The characterization method comprises the following steps: mixing crystalline polyaryletherketone and an arylalkylamine compound in a solvent, carrying out a heating reflux reaction under the protection of an inert atmosphere to generate a soluble imidization polyaryletherketone crude product, washing, dissolving, precipitating, purifying and drying to obtain a soluble imidization polyaryletherketone crude product, and dissolving the soluble imidization polyaryletherketone crude product in a conventional organic solvent, the molecular weight and molecular weight distribution data are obtained through gel permeation chromatography; and reversely deducing the molecular weight and molecular weight distribution of the original crystalline polyaryletherketone according to the determined quantitative molecular weight conversion relationship between the crystalline polyaryletherketone and the imidized polyaryletherketone. The characterization method has the advantages that the complete molecular weight and molecular weight distribution information of the crystalline polyaryletherketone can be obtained, the applicability is wide, the operation is safe, and the result is accurate and reliable.

The present application relates to a kind of crystalline polyaryletherketone molecular weight and the characterization method of molecular weight distribution, belong to material characterization method technical field.Solve the problem that crystalline polyaryletherketone is difficult to dissolve in common solvent, leading to the difficulty of molecular weight characterization.The characterization method of the present application, crystalline polyaryletherketone is mixed with arylalkylamine compound in solvent under the protection of inert atmosphere, heated to reflux reaction, generates soluble imidized polyaryletherketone crude product, after washing, dissolving-precipitation purification and drying, it can be dissolved in conventional organic solvent, obtain its molecular weight and molecular weight distribution data by gel permeation chromatography;According to the quantitative molecular weight conversion relationship between crystalline polyaryletherketone and imidized polyaryletherketone, the molecular weight and molecular weight distribution of original crystalline polyaryletherketone are deduced back.The characterization method has the advantages of being able to obtain the complete molecular weight and molecular weight distribution information of crystalline polyaryletherketone, wide applicability, safe operation, accurate and reliable result.

The present invention discloses a method for detecting the content of monomer substances in Tritan plastic. The method comprises: preparing a standard working solution with a series of concentrations, preparing a sample test solution, and detecting the monomer substance content of the sample solution by gas chromatography-tandem mass spectrometry; the sample pretreatment and sample test solution preparation comprising: dissolving the sample with a dissolving solvent, first precipitating it with a main precipitant, taking the supernatant and then precipitating it with an auxiliary precipitant, filtering, drying, and re-dissolving. The present invention utilizes a dissolution-precipitation-precipitation method as a sample pretreatment operation, which can achieve excellent results. Hexafluoroisopropanol is used to dissolve Tritan plastic, and any residual monomer 2,2,4,4-tetramethyl-1,3-cyclobutanediol is completely extracted. After precipitation with methanol as the main precipitant, acetonitrile is used as an auxiliary precipitant to almost completely remove high-molecular-weight polymers, protecting the chromatography-mass spectrometry system from contamination.

The present invention discloses a wet-process recovery method for a three-way catalyst, belonging to the technical field of precious metal catalyst recovery. The method comprises crushing, calcining, and alkaline hydrolyzing the three-way catalyst to obtain a reduced residue, which is then dissolved and precipitated to obtain palladium and platinum. The remaining rhodium-containing insoluble residue after dissolution is subjected to high-temperature annealing and acid hydrolysis to precipitate rhodium. A dedicated precipitant is used for the precipitation of platinum, palladium, and rhodium. The method utilizes a step-by-step leaching and recovery process to recover rhodium, platinum, and palladium, respectively, thereby improving the leaching rate and recovery rate of the three metals.

The invention provides a novel method for rapidly screening and accurately analyzing the quaternary ammonium salt surfactant. In order to solve the problems of weak selectivity or long time consumption and high cost of a detection method in the prior art, a sodium tetraphenylborate-bromcresol purple-phosphate buffer salt mixed solution is adopted as a probe solution, quaternary ammonium salt surfactants in a sample are rapidly identified through probe reaction, a positive sample is subjected to high-speed centrifugation, dissolution and precipitation, and the content of the quaternary ammonium salt surfactants in the sample is detected. Further liquid chromatography-mass spectrometry analysis is carried out, so that accurate qualitative and quantitative analysis on the quaternary ammonium salt surfactant is realized. The method can effectively meet the requirements of rapid screening and accurate analysis, has important practical value and wide application prospect, and can remarkably improve the working efficiency and reduce the analysis cost especially in the fields of environmental protection, daily chemical management and the like.

The invention discloses a porous underground gas storage pore scale rock salting-out prediction method and device, and the method comprises the following steps: obtaining pore structure data of target reservoir rock, and constructing a three-dimensional digital core model based on the pore structure data; establishing a multi-phase multi-component migration mathematical model for describing the salting-out phase change process, wherein the mathematical model is coupled with a salt dissolution-precipitation kinetic equation, a mass conservation equation, a momentum conservation equation and a component transportation equation; importing the three-dimensional digital core model and the mathematical model into a computational fluid dynamics simulation platform, and setting boundary conditions and initial conditions to simulate gas storage injection-production working conditions; running simulation calculation to obtain salt particle precipitation volume fraction distribution, brine flow field distribution and permeability evolution data under the pore scale; predicting the salting-out blockage risk of the reservoir based on the permeability evolution data; according to the method, refined and quantitative simulation and prediction of the salting-out process of the underground gas storage on the pore scale are realized for the first time.

The invention discloses a method for the dissolution-precipitation behavior of uranium in CO2-rich fluid, which comprises the following steps: (1) preparation before reaction: respectively adding sigma CO2 solutions capable of generating different capacities and an equal amount of uranium-containing substances into a plurality of reaction tubes, and sealing the open ends of the reaction tubes; and (2) reaction and detection: heating the plurality of reaction tubes at different temperatures to enable CO2 fluid generated by the sigma CO2 solution to react with the uranium-containing substance, and detecting and acquiring the relationship among the uranium content change, the temperature change and the CO2 concentration in the plurality of reaction tubes. By adopting the method, the mineralization theory of the hydrothermal uranium ore deposit is enriched, and the uranium ore leaching conditions are limited.

Object of the present invention is a novel environmentally friendly process for the degradation of plastic materials containing polyesters. The process provides for a pre-treatment of dissolution / precipitation of the plastic material in appropriate solvents, aimed at facilitating the subsequent depolymerization step of the polyester.