66 results about "Calcium crystals" patented technology

The invention relates to a surface modified product of an acicular wollastonite crystal and a production method thereof. The product is micro-nano composite powder by coating a nanometer calcium carbonate crystal on the surface of the acicular wollastonite fiber crystal. The method comprises the following steps: firstly, preparing an active lime milk solution and an acicular wollastonite fiber solution; compounding the two solutions into a suspension; adding a crystalline directing agent to the suspension and filling CO2 gas for a coating reaction so that the nanometer calcium carbonate crystal gradually grows on the surface of an acicular aedelforsite fiber, and the micro-nano composite powder by coating a nanometer calcium carbonate crystal on wollastonite is obtained; and coating a layer of coupling agent on the surface of the micro-nano composite powder to obtain the acicular wollastonite fiber crystal-nanometer calcium carbonate crystal-coupling agent composite powder material. The product keeps the superior characteristics of the acicular wollastonite crystal and the nanometer calcium carbonate crystal, improves the surface energy and the chemical activity of wollastonite composite particles and can be well stuck with organic polymers so as to form a favorable interface and improve the bonding force between fillings and basal bodies, such as plastics, pulp, and the like.

The invention relates to a preparation method of morphology controllable calcium carbonate based on temperature control. The preparation method of the morphology controllable calcium carbonate based on the temperature control comprises the following steps: introducing a solution containing carbonate or gas such as CO2 which can generate carbonate or a gas mixture containing CO2 into a solution containing calcium ions at the temperature of 10-100 DEG C, initiating precipitation reaction, obtaining a precipitate mixture several minutes later, and drying at room temperature, so that micron-sized calcium carbonate crystals with specific morphology are obtained. The calcium carbonate obtained by adopting the preparation method is good in correspondence between morphology and reaction temperature, and the correspondence is independent of type of a reactant; the obtained calcium carbonate crystals are well dispersed and uniform in sized; meanwhile, control of crystal form is efficient and stable; besides, by adopting a temperature control process, one-step synthesis, simplicity and practicability are realized, and industrial cost is low, so that the preparation method of the morphology controllable calcium carbonate based on the temperature control can be widely applied to batch preparation of calcium carbonate in different morphologies.

The invention discloses a method for simply preparing vaterite calcium carbonate microspheres. The preparation method comprises the steps of 1, preparing a sericin solution; 2, preparing a sericin solution with a certain concentration as a template regulation system through the dialyzed sericin solution according to the chemical equation shown in the specification, and dropping calcium salt and carbonate which have the same concentration into a reaction system in a certain proportion; 3, agitating the reaction system for a period of time, centrifuging to remove precipitate, and washing with water at three times; 4, drying the CaCO3 precipitate through a drying box after water washing, so as to obtain the finished product of vaterite calcium carbonate microspheres. The granularity of the CaCO3 microspheres is 1 to 1.5 microns; the vaterite calcium crystal form in the obtained material is more than 80%; the natural sericin solution is used as the template regulation system to regulate CaCO3 crystal form.

The invention provides a drainage structure for controlled drainage of a tunnel and a tunnel drainage system with the same. The drainage structure for controlled drainage of the tunnel comprises two drain pipes, wherein the two drain pipes are connected and the diameters of the two drain pipes are different. The diameter of the drain pipe A is smaller than the diameter of the drain pipe B. One end of the drain pipe A is sealed, and the sealed end of the drain pipe A stretches into the drain pipe B. The drainage structure further comprises a spring, the spring is fixedly connected with the bottom of the sealed end of the drain pipe A, a sluice valve block matched with the cross section of the drain pipe A in size is arranged at the movable end of the spring, a plurality of water outlets are formed between the bottom end of the drain pipe A and the sluice valve block, and the sluice valve block is connected into the drain pipe A in a sliding mode through a plug. The drainage structure and the tunnel drainage system with the drainage structure are simple, have the moderate drainage effect, can further ingeniously eliminate calcium crystals (or suspended sediment) adhering to the inner portions of the drain pipes, and are high in operability, wide in practicability and capable of effectively promoting the development of drainage systems of tunnels which are high in ecological system requirement or tunnels in limestone areas.

The invention discloses a method for preparing organic calcium with eggshells. The method includes the steps of 1), breaking; 2), performing enzymolysis; 3), fermenting; 4), extracting; 5), packaging. The method for preparing the organic calcium with the eggshells is simple and efficient, large-scale production can be performed, extraction rate reaches 86.36%, content of calcium lactate is 93.62%, calcium gluconate is 5.46%, and revenue is increased by 15.6%. Residue protein can be decomposed by directly adding protease into the broken eggshells, and impurities in an eggshell solution can be reduced; the eggshell solution subjected to enzymolysis is fermented via lactic acid bacteria, macromolecular impurities are decomposed, lactic acid is produced, calcium ions in the calcium carbonate is separated out, and formation of the calcium lactate is facilitated; the solution is subjected to secondary crystallization to separate out organic calcium crystals, and extract rate of the organic calcium is increased; the abandoned eggshells are fully utilized and made profitable, low cost is achieved, cost is saved, poisonous reagents are not used during the preparation, residues of the reagent cannot be caused, and the method is healty and environment friendly.

The invention relates to a preparation method of a treatment material, in particular to a preparation method of a self-foaming porous composite bone repair bracket. The preparation method comprises the following steps: during the synthesis process of a phosphomycin calcium-polyurethane composite, foaming agent water is uniformly compounded in the material in a phosphomycin calcium crystal water form; crystal water is released under a certain condition to react with isocyanato in polyurethane system, so as to generate CO2 gas, achieve self-foaming formation of the composite system, and prepare a phosphomycin calcium-polyurethane composite bone repair bracket with porosity and uniform pores. The in situ self-foaming method is easy and feasible.

The invention relates to L-aspartic acid chelated calcium and a preparation method thereof. The preparation method comprises the following steps: adding calcium hydroxide and L-aspartic acid into water; then homogenizing and dispersing; regulating the pH (Potential of Hydrogen) value of a solution to be 7.3 to 7.5; then de-coloring and filtering to obtain a dissolved solution with the solid content granularity which is less than 30mu m; enabling the dissolved solution to react under pre-set temperature and pre-set pressure; then carrying out concentration to obtain a concentrated solution; depressurizing and cooling the concentrated solution to obtain an L-aspartic acid chelated calcium crystal; adding the L-aspartic acid chelated calcium crystal into water; then carrying out homogenization and dispersion and filtering treatment in sequence to obtain amino acid chelate clear liquid; then carrying out spray-drying treatment on the amino acid chelate clear liquid to obtain the L-aspartic acid chelated calcium. The invention provides a method for efficiently and rapidly producing amino acid chelate in a large scale; the reaction time can be shortened and the yield is improved; the purity of the prepared L-aspartic acid chelated calcium is high, and the production cost can be greatly reduced.

Belonging to the field of food deep processing, the invention discloses a method for production of high active calcium fishbone pulp by ultra-high pressure micro-jet technology and prepared fishbone pulp. The method includes the steps of: raw material cleaning, raw material chopping, raw material rinsing, fishbone pulp production, adjustment of pH and moisture content of the fishbone pulp, ultra-high pressure micro-jet homogenization, strain adding, and fishbone pulp fermentation, thus obtaining the high active calcium fishbone pulp. Before fermentation, ultra-high pressure micro-jet homogenization pretreatment is carried out on the fishbone pulp, thus being conducive to loosening the internal tissue structure of fishbone pulp and softening calcium carbonate, calcium hydroxylapatite crystals and other water-insoluble substances, facilitating the transformation of inorganic calcium crystals by probiotics and related enzymes, and increasing the content ratio of calcium ions in fishbone pulp.

The invention provides an application of graphene oxide in improving soil consolidation strength, a composition and an application method of the composition, and relates to the technical field of microbially induced calcium carbonate soil improvement. According to the application of graphene oxide in improving the soil consolidation strength, the composition and the application method of the composition, the graphene oxide can enable microorganisms to induce the rapid growth of calcium carbonate crystals in calcium carbonate, and the yield of the calcium carbonate is increased; and the size ofthe calcium carbonate crystals can further be changed, the consolidation of soil is facilitated, and the compressive strength of the soil is improved.

The invention discloses a metal organic framework-calcium carbonate composite crystal material and a preparation method thereof, and belongs to the technical field of nano composite materials. The metal organic framework-calcium carbonate composite crystal material can be obtained by performing polymer modification on the surfaces of metal organic framework crystal particles, then adding the metal organic framework crystal particles into a calcium chloride aqueous solution and synthesizing calcium carbonate crystals by using an ammonia diffusion method. In the composite crystal material, the metal organic framework particles can be uniformly embedded in the inorganic calcium carbonate crystal, so that the thermal stability and alkali stability of the composite crystal material are greatly improved, and the composite crystal material has important application value in the technical fields of catalysis, printing ink, coatings, proton conduction and biological medicines.

The invention relates to the field of environmental geotechnical engineering, in particular to a microbial ecological modification method for expansive soil. The method comprises the following steps: respectively obtaining to-be-modified expansive soil and a sporosarcina pasteurii bacterial solution; mixing urea and calcium salt to obtain a cementing liquid; mixing the sporosarcina pasteurii bacterial liquid and the cementing liquid according to a preset volume ratio, and then adding the mixture into to-be-modified expansive soil for mixing to obtain a sample; maintaining the sample to obtain the green and environment-friendly modified expansive soil. By adopting sporosarcina pasteurii, urea can be continuously hydrolyzed into NH4 < + > and CO3 < 2->, meanwhile, Ca < 2 + > in expansive soil and added CaCl2 is continuously attracted to the surfaces of thalli, and Ca < 2 + > and CO3 < 2-> are combined on the surfaces of the thalli to form calcium carbonate crystals, so that the soil body strength of the expansive soil is enhanced; meanwhile, residual NH4 < + > and Ca < 2 + > in the reaction system can reduce the expansibility of the expansive soil through the effects of neutralizing negative charges and replacing cations respectively.

The invention discloses a phosphogypsum waste residue treatment method, which comprises the following steps: washing phosphogypsum waste residues with deionized water, drying, grinding, and sieving toobtain pretreated phosphogypsum powder; uniformly mixing and stirring glycerol and absolute ethyl alcohol, then adding dodecyl trimethyl ammonium bromide, and continuously stirring until a solid is dissolved to prepare a solution A; mixing and stirring the prepared pretreated phosphogypsum powder and a nitric acid solution, then adding a sulfuric acid solution, continuously stirring to prepare asolution B, slowly dropwise adding the prepared solution A into the solution B, transferring the prepared mixture into a reaction kettle by adopting intermittent ultrasonic treatment, reacting, cooling to room temperature after the reaction is finished, and filtering the reaction solution to obtain a filtrate; and filtering to obtain a solid, and drying the solid to obtain the nano calcium sulfatecrystal. The method is simple to operate, and the prepared nano calcium sulfate crystal is good in stability, has the particle size of 30-50nm and is good in dispersion.

The invention belongs to the technical field of building materials, and particularly relates to a mineral admixture and a preparation method thereof. The proportion of a crystalline phase in the mineral admixture is 60% by mass or more. Based on the total mass of the crystalline phase, the crystalline phase comprises 0-10% of dicalcium silicate crystals, 0-3% of calcium oxide crystals, 50-85% of iron oxide doped calcium sulphosilicate crystals, 0-12% of calcium sulphoaluminate crystals and 0-15% of tetracalcium aluminoferrite crystals. The mineral admixture disclosed by the invention has highhydration activity, and after the mineral admixture is used for replacing 30% of reference cement, according to a GBT 1596-2005 test, the 3d activity index is greater than 115%, the 7d activity indexis greater than 135%, and the 28d activity index is greater than 130%. Meanwhile, industrial solid waste can be used as a raw material for preparation, and waste is turned into wealth.

The invention relates to a light high-strength calcium silicate board for coating/laminating and a preparation method thereof, the calcium silicate board comprises the following raw material components by weight: 22%-33% of a siliceous material, 20%-30% of a calcareous material, 8%-30% of cement, 8%-20% of calcium silicate crystals, 5%-15% of fiber pulp, 3%-10% of an inorganic filler and 2%-6% of a board inorganic auxiliary agent; the preparation method comprises the following steps: adding water into all the raw material components, uniformly mixing, then preparing a light calcium silicate board blank through a beater-addition process, then curing, then carrying out an autoclaved reaction to obtain a light calcium silicate board semi-finished product, then drying the moisture to be below 10wt%, and then sanding and trimming to obtain a light high-strength calcium silicate board finished product. The calcium silicate board provided by the invention is a high-quality board which is low in density, high in strength, good in dimensional stability, high in internal bonding strength and excellent in fireproof performance, the density of the calcium silicate board is 0.6-1.0 g/cm < 3 >, the breaking strength of the calcium silicate board is 10 MPa or above, the internal bonding strength of the calcium silicate board is 1.6 MPa or above, and the technological requirements of coating, film covering and the like are met.

The invention provides a preparation method of D-pantoic acid calcium. The preparation method comprises a step of reacting D-pantolactone with calcium hydroxide to obtain a mixed solution containing D-pantoic acid calcium. The preparation method provided by the invention is simple and feasible, a solvent is safe and pollution-free, stable crystals can be formed under a low-temperature condition, and the obtained D-pantoic acid calcium crystals are non-sticky to the wall, non-caking, few in impurities and high in purity.