8results about "Barium carbonates" patented technology

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 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 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 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.

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 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.