24results about "Barium carbonates" patented technology

The invention discloses an electronic-grade barium carbonate and a preparation method thereof. The preparation method is as follows: dissolving barium chloride in double distilled water to prepare a barium chloride solution; dissolving sodium carbonate in double distilled water to prepare a sodium carbonate solution; adding a surfactant to the sodium carbonate solution, stirring at a constant temperature to obtain a mixed solution; adding a crystal form control agent to the barium chloride solution, then dropwise adding the mixture into the mixed solution, stirring for reaction, centrifuging and washing the product to obtain a crude barium carbonate product; roasting the crude barium carbonate product to obtain the electronic-grade barium carbonate; the purity of the prepared barium carbonate is above 99.9%, the content of impurity ions such as iron, calcium, sodium, magnesium, strontium, etc. is extremely low, and D 50 0.4μm, spherical shape, BET 10~30m 2 / g, which can fully meet the needs of producing precision high-end electronic components.

The present application relates to barium carbonate preparation technical field, disclose a kind of preparation method of nanoscale barium carbonate, comprising the following steps: (1) sodium carbonate is weighed and added to deionized water, obtain sodium carbonate solution, (2) barite powder is added to sodium carbonate aqueous solution, heated to boiling state reaction, filtration is obtained filter residue, (3) ammonium chloride solution is added to filter residue, heated to boiling state reaction, filtration is obtained first reaction liquid, while recovering fraction, obtain second reaction liquid, (4) first adjusting agent is added to first reaction liquid, then air is introduced by membrane dispersion method, obtain nanobubble reaction liquid, (5) second adjusting agent is added to second reaction liquid, obtain third reaction liquid, (6) third reaction liquid is slowly added to nanobubble reaction liquid, stir at room temperature, then filter, wash, dry, obtain nanoscale barium carbonate;The present application has the effect of no tail gas emission, high purity, reduce production cost.

The invention discloses a method for removing carbonate in a sodium aluminate solution, and relates to the technical field of sodium aluminate solution purification, and the method comprises the following steps: obtaining a barium hydroxide solution with a set mass concentration, and using barium hydroxide as a carbonate remover to prepare a reaction solution; adding the barium hydroxide solution into a sodium aluminate solution, so that the barium hydroxide and carbonate in the sodium aluminate solution are subjected to precipitation reaction to generate barium carbonate precipitate, thereby obtaining a mixed solution containing the precipitate; and carrying out solid-liquid separation on the mixed solution to obtain a sodium aluminate refined solution with carbonate removed and a barium carbonate precipitate. The method is simple and easy to implement, the removal cost of carbonate radicals is effectively reduced, and resources and energy are saved. Meanwhile, sodium hydroxide generated by the reaction of sodium carbonate and barium hydroxide can be used as a beneficial supplement in the production of aluminum hydroxide, so that the reutilization of resources is realized, and the total cost of carbonate removal is further reduced.

The present invention related to a method for manufacturing at least one carbon-14 [14C, herein after] labeled alkaline earth metal carbonate from at least one neutron-irradiated metallic nitride, wherein the method comprises at least the following successive steps: a) contacting at least one neutron-irradiated metallic nitride with at least one aqueous solution to produce a gaseous stream (G) and an aqueous suspension (S); b) contacting said gaseous stream (G) with an acidic solution to produce at least one 14C-labeled enriched gaseous stream; c) subjecting said at least one 14C-labeled enriched gaseous stream to an oxidation process to produce at least one oxidized gaseous stream; d) treating said at least one oxidized gaseous stream with an alkaline solution comprising at least one alkali metal hydroxide base to produce a 14C-labeled aqueous solution comprising at least one 14C-labeled alkali metal carbonate; and e) treating said 14C-labeled aqueous solution comprising at least one 14C-labeled alkali metal carbonate with at least one alkaline earth metal salt solution, thereby obtaining a precipitated 14C-labeled alkaline earth metal carbonate.

The invention relates to a method for the industrial production of an alkaline earth metal compound which is not an alkaline earth metal sulphate, at least comprising the following steps: S1) (i) producing or providing an alkaline earth metal sulphate and separately (ii) producing or providing a reduction gas; S2) reducing the alkaline earth metal sulphate produced or provided in step S1) by means of the reduction gas such that a corresponding alkaline earth metal sulphide results.

The invention discloses a preparation method of barium titanate powder for preparing a multilayer ceramic capacitor, which comprises the following steps: respectively preparing a barium source and ammonium bicarbonate into solutions, mixing, stirring at room temperature, standing, precipitating and filtering to obtain high-purity barium carbonate; the preparation method comprises the following steps: uniformly mixing high-purity barium carbonate and titanium dioxide, carrying out ball milling to obtain slurry, drying the slurry, grinding, sieving, calcining, and cooling to obtain barium titanate powder; the preparation method comprises the following steps: adding barium titanate powder and a modified additive into water, carrying out ultrasonic dispersion, drying to obtain mixed powder, carrying out secondary sintering on the mixed powder, and carrying out mixing and ball milling on a product obtained by sintering and bismuth stearate to obtain the modified barium titanate powder. The BaTiO3 powder is successfully and efficiently prepared from different barium sources through a solid-phase reaction method, and the BaTiO3 powder has a larger specific surface area; the metal elements added through modification can enable barium titanate crystal grains to bear higher voltage, so that the breakdown voltage of the MLCC prepared from the barium titanate powder is improved, and the durability of the MLCC is improved.

The invention relates to a process for removing solubilised metals from a solution by carbonate precipitation of the metal. Carbonate is formed in situ by dissolving carbon dioxide in the solution using an enhanced gas-dissolution unit such as a membrane contactor, and raising the pH of the solution. Metals to be removed include scaling metals, e.g. calcium, strontium, barium or combinations thereof.

The invention discloses continuous flow micro-reaction equipment for synthesizing high-purity fluorescent-grade barium carbonate, the continuous flow micro-reaction equipment comprises a bottom plate, a support, an injection mechanism, a monitoring mechanism and a micro-reaction mechanism, the adjusting mechanism comprises an adjusting plate and an adjusting block, through the arrangement of the adjusting mechanism, when a micro-reaction channel is blocked, the micro-reaction channel is blocked, and the micro-reaction channel is blocked. The aperture of the micro-reaction channel can be increased through sliding of the adjusting mechanism, so that blockages are not clamped in the micro-reaction channel any more, then the two blocking plates are opened, the gas supply mechanism is utilized to fill pure gas into the micro-reaction channel to blow out the blockages, and the waste collection mechanism is utilized to collect the blockages for subsequent treatment. Automatic cleaning of the micro-reaction mechanism is achieved, then the production efficiency of barium carbonate is effectively improved, data such as temperature and pressure in the reaction process are monitored in real time through the monitoring mechanism, the reaction temperature and pressure are adjusted in real time according to the monitored data, and then the purity of barium carbonate is effectively improved.

The invention relates to the technical field of preparation of barium carbonate, and discloses a preparation method of nanoscale barium carbonate, which comprises the following steps: (1) weighing sodium carbonate and adding into deionized water to obtain a sodium carbonate solution, (2) adding barite powder into the sodium carbonate solution, heating to a boiling state, reacting, and filtering to obtain filter residues, (3) adding an ammonium chloride solution into the filter residues, and filtering to obtain the nanoscale barium carbonate. (4) adding a first conditioning agent into the first reaction solution, and then introducing air through a membrane dispersion method to obtain a nano-bubble reaction solution, and (5) adding a second conditioning agent into the second reaction solution to obtain a third reaction solution, and carrying out vacuum filtration to obtain a finished product. (6) slowly dropwise adding the third reaction solution into the nano-bubble reaction solution, stirring at normal temperature, filtering, washing and drying to obtain nano-scale barium carbonate; the method has the effects of no tail gas emission, high purity and reduced production cost.

The invention discloses a process route for preparing a high-purity strontium or barium compound, and belongs to the technical field of material utilization. The method comprises the following steps: adding raw materials containing strontium or barium carbonate, oxide and the like containing various impurities into high-molecular-weight organic acid under a stirring condition, and dissolving to prepare an organic acid salt solution containing strontium and impurity elements; and washing the organic acid salt solution by using an inorganic acid or a small molecular weight organic acid solution, and washing strontium or barium dissolved in the organic acid into an aqueous solution. According to the strontium purity or the barium purity and the impurity content, the washing frequency is adjusted till the purity of the obtained strontium solution or the barium solution meets the quality requirement. And concentrating and crystallizing the strontium solution or barium solution meeting the quality requirement to obtain the corresponding salt. A qualified strontium solution or barium solution is used as a raw material, and carbonate, oxalic acid or oxalate is added to obtain strontium carbonate or barium carbonate and strontium oxalate or barium oxalate products. And the organic acid salt solution after strontium or barium washing is regenerated and recycled by using high-concentration acid.

The invention relates to the technical field of barium slag innocent treatment, in particular to a method and device for co-production of barium carbonate through barium slag innocent treatment, barium slag is crushed and sieved, and the particle size of barium slag powder is strictly controlled to be smaller than or equal to 5 mm; then barium slag powder and a hydrochloric acid solution are mixed, heated and stirred for a reaction, the contact area of the action of barium slag and the hydrochloric acid solution is increased, the leaching treatment efficiency of the hydrochloric acid solution is improved, and through plate-frame pressure filtration, pressure filtration liquid can be fully separated from the pressure filtration liquid, and a large number of available barium resources are promoted to enter the pressure filtration liquid; the content of soluble barium in press filter residues is reduced, the leaching rate of barium ions in harmless residues is reduced, and the harmlessness is reduced; the press filtrate is subjected to collaborative sedimentation treatment by adopting a precipitator and a flocculant, so that barium ions dissolved in the press filtrate are fully utilized to generate a barium carbonate product, and then the steps of washing and drying are performed, so that the quality of the barium carbonate product is improved, the additional value of the whole process is improved, and the harmless treatment cost of the barium slag is reduced.

The invention discloses a preparation method of barium carbonate powder. The preparation method comprises the following steps: respectively preparing a Ba (NO3) 2 solution and an NH4HCO3 solution by using deionized water; the preparation method comprises the following steps: dropwise adding an NH4HCO3 solution into a Ba (NO3) 2 solution under magnetic stirring, stopping magnetic stirring after the NH4HCO3 solution is dropwise added, and standing and precipitating the solution; and filtering and collecting the precipitate, washing the precipitate with deionized water during filtering, and carrying out vacuum drying to obtain the barium carbonate powder. According to the preparation method, barium nitrate is taken as a barium source, ammonium bicarbonate is taken as a carbon source, high-purity superfine BaCO3 powder is prepared through a double decomposition method, and the high-purity superfine BaCO3 powder has a witherite configuration, shows a granular structure which is uniformly distributed in a range of 100nm-200nm, and not only has more uniform particle size distribution, but also has a larger specific surface area.

The present invention discloses a dielectric electromagnetic composition, wherein the dielectric electromagnetic composition comprises BaTi2O5 or (Ba (1‑x) Ca x )Ti2O5, wherein 0≤x<0.1, and the surface of the matrix material powder particles is coated with at least one selected from the group consisting of Mg, Mn, V, Ba, Si, Al and rare earth metals.

Provided are a system and method for preparing barium carbonate by enhancing alkanolamine absorption and mineralization of CO2. The system includes a rotating packed bed provided with a first gas inlet, a first exhaust port, a first liquid inlet, and a first liquid outlet. An absorbent barren liquid storage container in communication with the first liquid inlet through a pipeline on which a water pump is arranged. A rich liquid storage container is in communication with the first liquid outlet through a pipeline. A saturated liquid storage container, an ultrasonic mineralization reaction device, and a mineralization feedstock storage container. The saturated liquid storage container is in communication with the rich liquid storage container and the ultrasonic mineralization reactor through a pipeline, respectively. The mineralization feedstock storage container is communicated with the ultrasonic mineralization reaction device through a pipeline on which a feeding blower is arranged.

The invention relates to the technical field of barium carbonate carbonization coupling reaction monitoring, and particularly discloses a barium carbonate gradient dynamic carbonization coupling reaction monitoring system, which comprises a carbonization stage identification module, a pre-carbonization stage monitoring module, a semi-carbonization stage monitoring module, a main carbonization stage monitoring module and a final carbonization stage monitoring module, the carbonation reaction is divided into four stages of pre-carbonation, semi-carbonation, main carbonation and final carbonation, the reaction stages are accurately judged by monitoring the Ba < 2 + > concentration and pH in real time, corresponding reaction state data of each stage are monitored according to preset intervals, CO2 introduction regulation and control demand indexes are analyzed in the pre-carbonation stage, the semi-carbonation stage and the main carbonation stage, and the CO2 introduction rate is dynamically regulated and controlled. And in the final carbonization stage, the forming completeness coefficient and the output quality index are calculated, the discharging interval is accurately judged, and graded collection of products is achieved. The problems of non-uniform local reaction, microcrystal agglomeration, impurity residues and the like caused by traditional'one-step 'regulation are solved, and the reaction controllability and the product quality stability are improved.

A method for carbon dioxide (CO2) storage includes injecting a brine solution into a subterranean anhydrite-rich formation, then injecting carbon dioxide into the subterranean anhydrite-rich formation and reacting the carbon dioxide with the subterranean anhydrite-rich formation to form one or more minerals thereby sequestering the carbon dioxide in the subterranean anhydrite-rich formation. The temperature in the subterranean anhydrite-rich formation is from 300 Kelvin (K) to 365 K and the pressure in the subterranean anhydrite-rich formation is from 90 bar to 120 bar.

A method of hydrolyzing a calcium chloride brine includes forming ammonia gas including reacting NH4Cl brine with Ca(OH)2 to form NH3 and the CaCl2 brine. The method includes hydrolyzing the CaCl2 brine including reacting the CaCl2 brine formed during the forming of the ammonia gas with water to form HCl and Ca(OH)2. The method also includes recycling at least some of the Ca(OH)2 formed during the hydrolyzing of the CaCl2 brine for use as at least part of the Ca(OH)2 used in the forming of the ammonia gas.

A method of manufacturing a multilayer ceramic electronic component includes: preparing a dielectric magnetic composition including base material powder particles including BaTi2O5 or (Ba(1-x)Cax)Ti2O5 (0≤x≤0.1), the base material powder particles having surfaces coated with one or more of Mg, Mn, V, Ba, Si, Al and a rare earth metal; preparing ceramic green sheets using dielectric slurry including the dielectric magnetic composition; applying an internal electrode paste to the ceramic green sheets; preparing a green sheet laminate by stacking the ceramic green sheets to which the internal electrode paste is applied; and preparing a ceramic body including dielectric layers and a plurality of first and second internal electrodes arranged to face each other with each of the dielectric layers interposed therebetween by sintering the green sheet laminate.

The invention belongs to the technical field of electronic material synthesis, and discloses a preparation device and a preparation method of high-purity barium carbonate. The invention utilizes the principle of precipitation reaction, takes high-purity barium hydroxide octahydrate as raw material, and fully considers the low solubility of barium hydroxide octahydrate at room temperature, adopts heating to improve its solubility, and stirs and dissolves it in hot water; by arranging a gas distribution plate at the bottom of the reactor, the gas can be evenly dispersed in the solution, and the precipitation reaction speed and the uniformity of the finished product are improved; and by adopting a circulating ventilation method, the utilization rate of carbon dioxide reaches 100%. The barium carbonate slurry produced by the reaction is filtered, dehydrated, and dried to obtain high-purity barium carbonate. The entire reaction process is environmentally friendly, has a high synthesis conversion rate, a high carbon dioxide utilization rate, and a high product purity, and fully meets the use requirements of the electronics industry.

The application discloses a process route for preparing high-purity strontium or barium compounds and belongs to the technical field of material utilization. A strontium or barium carbonate containing multiple impurities and an oxide and the like are added into a high-molecular-weight organic acid under stirring to prepare an organic acid salt solution containing strontium and impurity elements. The organic acid salt solution is washed by using an inorganic acid or a small-molecular-weight organic acid solution, and strontium or barium dissolved in the organic acid is washed into an aqueous solution. According to the purity of strontium or barium and the content of impurities, the number of washing is adjusted until the purity of the obtained strontium solution or barium solution meets the quality requirement. The strontium solution or barium solution meeting the quality requirement is concentrated and crystallized to obtain corresponding salts. The qualified strontium solution or barium solution is used as raw material, and a carbonate, oxalic acid or an oxalate is added to obtain strontium carbonate or barium carbonate and strontium oxalate or barium oxalate products. The organic acid salt solution after washing strontium or barium is regenerated by using a high-concentration acid and is recycled.

The invention discloses an automatic feeding device and method for particle size controllable high-purity barium carbonate production, and relates to the technical field of chemical engineering. The vibration pipe is arranged in the positioning pipe, the vibration pipe and the positioning pipe are concentric pipes, and the two ends of the vibration pipe are connected to the material control assemblies at the corresponding ends; the transmission assemblies are distributed on the outer wall of the conveying pipe in an array mode in the circumferential direction; the driving motor is arranged on the outer wall of the positioning pipe, and the output end of the driving motor is connected with any transmission assembly and serves as a driving source of the material control assembly; the feeding precision of the barium carbonate production raw materials is controlled through cooperative operation of the material control assembly and the vibration pipe.

The invention discloses an impurity removal process of high-purity electronic-grade barium carbonate, which comprises the following steps: firstly, primarily purifying a raw material barium chloride, then respectively preparing the purified raw material barium chloride and ammonium bicarbonate into solutions, and then mixing the two solutions for precipitation reaction to prepare a crude product barium carbonate; the method is characterized in that the crude product is dispersed in an aqueous solution containing special modified biochar for adsorption washing so as to deeply remove impurities, and finally solid-liquid separation and drying treatment are performed to obtain the target product. The method is mild in process condition, simple and convenient to operate, green and environment-friendly, can be used for stably preparing the electronic-grade barium carbonate meeting the harsh standard at lower cost, and has remarkable economic benefits and industrial application prospects.

The present invention related to a method for manufacturing at least one carbon-14 [14C, herein after] labeled alkaline earth metal carbonate from at least one neutron-irradiated metallic nitride, wherein the method comprises at least the following successive steps: a) contacting at least one neutron-irradiated metallic nitride with at least one aqueous solution to produce a gaseous stream (G) and an aqueous suspension (S); b) contacting said gaseous stream (G) with an acidic solution to produce at least one 14C-labeled enriched gaseous stream; c) subjecting said at least one 14C-labeled enriched gaseous stream to an oxidation process to produce at least one oxidized gaseous stream; d) treating said at least one oxidized gaseous stream with an alkaline solution comprising at least one alkali metal hydroxide base to produce a 14C-labeled aqueous solution comprising at least one 14C-labeled alkali metal carbonate; and e) treating said 14C-labeled aqueous solution comprising at least one 14C-labeled alkali metal carbonate with at least one alkaline earth metal salt solution, thereby obtaining a precipitated 14C-labeled alkaline earth metal carbonate.

A process for the industrial production of an alkaline earth metal compound other than an alkaline earth metal sulfate, comprising at least the following steps: S1) (i) Manufacture or supply of an alkaline earth metal sulfate and separately (ii) Production or supply of a reducing gas; S2) Reducing the alkaline earth metal sulfate produced or provided in step S1) using the reducing gas so that a corresponding alkaline earth metal sulfide results.