17 results about "Low calcium" patented technology

The invention relates to the technical field of environmental science and engineering, and discloses a method for removing and recycling fluorine ions by promoting calcium fluoride precipitation through sulfate doping, and the method comprises the following steps: S1, preparing sodium fluoride solutions of sulfate with different concentrations, and analyzing the influence of different sulfate concentrations on calcium fluoride precipitation; s2, respectively adding calcium chloride solutions into the prepared sodium fluoride solutions of the sulfates with different concentrations; s3, the two solutions are subjected to a reaction within a set time, filtering is conducted after the reaction is conducted for a period of time, and the fluorine ion removal reaction is completed. By changing the concentration of sulfate in the sodium fluoride solution, the effect of the sulfate in calcium fluoride precipitation and the influence of the sulfate on the fluorine ion removal efficiency are researched; the positive effect and the action mechanism of the low-concentration sulfate in the calcium fluoride precipitation process are defined, and the problems that the influence of the sulfate in the high-fluoride wastewater on calcium fluoride precipitation is ignored, the calcium fluoride purity is low and the recovery difficulty is large are finally solved.

The invention provides a preparation for blood purification and a preparation method and application thereof.The preparation is in a solid state or a liquid state, L-malic acid serves as a pH regulator of the preparation, calcium citrate and calcium chloride are used for providing total calcium, the total calcium addition value of the preparation is 1.0-1.5 mmol / L, and the total calcium addition value of the preparation is 1.0-1.5 mmol / L. A dialysate for clinical application of the preparation contains ionized calcium and molecular calcium at the same time, the molar concentration ratio of the ionized calcium to the molecular calcium is 2-6, the ratio of the total calcium addition value to the molar concentration of the citrate radical is 10-12, the molar concentration ratio of the citrate radical to the L-malic acid is 0.05-0.15, and the molar concentration ratio of the citric acid radical to the L-malic acid is 0.05-0.15. The calcium chloride, the calcium citrate and the L-malic acid are reasonably proportioned, so that the supply of 80-85% of effective free calcium can be realized on the premise of ensuring a low total calcium addition value, thereby obviously reducing adverse reactions caused by low calcium or high calcium in the dialysis process, and effectively preventing and controlling dialysis syndromes and the problem of calcium ion disorder possibly occurring after dialysis.

The invention provides an organic silicon slurry residue treatment and calcium chloride recovery method based on lime milk circulating hydrolysis, and relates to the technical field of hazardous waste treatment and resource recycling, and the method comprises the following steps: S1, preparing lime milk; s2, circulating hydrolysis reaction; s3, slag-liquid separation and circulation; s4, repeated hydrolysis and concentration; s5, refining calcium liquid and extracting a finished product; according to the method, a lime milk recycling system for returning the filtrate to the lime milk stirring pool is constructed, and a scientific lime powder supplement amount calculation method is combined, so that the consumption of fresh lime powder is greatly reduced, and compared with a traditional single-time feeding process, the consumption of the lime powder can be reduced by 30% or above; meanwhile, the concentration of calcium chloride is stably increased to 30% or above through multiple times of circulating hydrolysis and concentration, the core problems of low calcium chloride concentration and low recovery value in a traditional process are solved, and efficient enrichment and recovery of calcium resources are achieved.

The application provides a preparation method of calcium hyaluronate, which comprises the following steps: adding sodium hyaluronate into an acidic displacement solution containing calcium salt, performing displacement to obtain calcium hyaluronate precipitate; washing the precipitate with an acidic washing solution; dehydrating the washed precipitate with a neutral dehydration solution, and vacuum drying to obtain calcium hyaluronate powder; wherein the organic medium concentration in the displacement solution is 50-90 wt%, preferably 60-80 wt%, the calcium salt concentration is 0.5-4 wt%, preferably 1-3 wt%, the organic medium concentration in the washing solution is 50-90 wt%, preferably 60-80 wt%, and the organic medium concentration in the dehydration solution is greater than or equal to 90 wt%. The application obtains calcium hyaluronate finished product through high-efficiency displacement, and solves the problems of multiple displacement times, long time consumption, large calcium salt consumption, low calcium displacement efficiency and turbidity of calcium hyaluronate solution in the current calcium hyaluronate production process.

The invention provides a nano C-S-H early strength agent and a preparation method thereof, and relates to the technical field of concrete admixtures. The nano C-S-H early strength agent is prepared from the following raw materials in percentage by mass: 3 to 5 percent of calcium source, 0.5 to 1 percent of triethanolamine, 45 to 55 percent of silica sol, 0.8 to 1.2 percent of styrene-butadiene latex, 0.8 to 1.2 percent of polycarboxylate superplasticizer and 39 to 47 percent of water. The nano C-S-H with high stability and low calcium-silicon ratio is prepared by taking silica sol as a silicon source, introducing a small amount of calcium source and taking a small amount of PCE, styrene-butadiene emulsion and triethanolamine as a composite stable dispersant.

The present disclosure provides a potassium aluminosilicate-based nanogel precursor additive and use thereof in a low calcium system-based geopolymer, belonging to the technical field of geopolymer additives. In the present disclosure, the potassium aluminosilicate-based nanogel precursor additive has a high-activity and potassium aluminosilicate-based short-chain structure, and is a precursor of the low calcium system-based geopolymer. The additive includes K2O, SiO2, and Al2O3, and has a K / Si molar ratio of 1.0 to 4.0 and an Al / Si molar ratio of 0.25 to 1.5. The potassium aluminosilicate-based nanogel precursor additive can be added to a matrix material of the low calcium system-based geopolymer, to effectively optimize a hydration process, balance an internal reaction, and improve a pore structure of the low calcium system-based geopolymer such as metakaolin, thereby improving mechanical properties. The additive effectively avoids harsh curing conditions, uneven hydration reaction.

The invention discloses a method and a device for recovering calcium in high-hardness water based on aluminum salt hydrolysis and dissolution, and the method is characterized in that the hydrolysis of the aluminum salt is advanced before the crystallization reaction of calcium carbonate, amorphous aluminum hydroxide generated by the hydrolysis is used as a seed crystal, and the seed crystal induced crystallization of the high-hardness water is carried out, so that the conventional homogeneous phase crystallization is inhibited; therefore, the problem of low calcium recovery rate caused by poor settling performance of a calcium carbonate crystallization product in a homogeneous crystallization process is solved; in order to realize cyclic utilization of the aluminum salt and improve the purity of the crystallization product, the amorphous aluminum hydroxide in the crystallization product is dissolved out in the form of metaaluminate by using the amphoteric characteristics of the amorphous aluminum hydroxide and is recycled as the aluminum salt after pH regulation. The method solves the problem of low recovery rate caused by poor settling performance of the crystallization product during recovery of the high-hardness water calcium carbonate crystallization calcium, realizes cyclic utilization of the aluminum salt, and improves the purity of the crystallization product.

1. Name of the designed product: packing bag (low calcium salt). 2. Use of the designed product: for packing edible salt. 3. Design points of the designed product: combination of shape and pattern. 4. Picture or photo showing the design points: front view. 5. The designed product is a thin product, and the left view, right view, top view and bottom view are omitted.

The present invention relates to the technical field of cement-based building materials, and in particular to a low-calcium clinker and a preparation method thereof. The dealkalized red mud is obtained by dealkalizing red mud, and raw materials are prepared by using carbide slag, fly ash and coal gangue as raw materials, and then calcined to prepare low-calcium clinker, and high-grade recovery of recycled iron can be achieved at the same time.

The present invention relates to an eco-friendly de-icing agent with excellent ice-melting performance and preservation properties, and more specifically, is composed of a chloride, citric acid, a phosphate, glycerin, and an ice-melting aid, wherein the ice-melting aid is composed of rice bran. The eco-friendly de-icing agent composed of the above components exhibits excellent ice-melting performance and preservation properties. In addition to exhibiting excellent ice-melting performance, it is eco-friendly as it has a low calcium chloride content, which reduces road efflorescence, rebar corrosion, and soil contamination, and exhibits excellent preservation properties as it suppresses hardening during storage.

The invention relates to the technical field of flue gas pollution prevention and control, discloses a high-activity calcium-based powdery desulfurizer and a preparation method thereof, and aims to solve the problems of invalid consumption, low calcium utilization rate and difficulty in resource utilization of desulfurization byproducts caused by high-concentration CO2 competitive reaction of an existing calcium-based desulfurizer. According to the invention, an interface layer with a SO2 selective recognition function is constructed on the surface of quick lime by adopting a modifier compounded by an amino silane coupling agent and organic carboxylic acid, and effective rejection of CO2 and preferential adsorption of SO2 are realized by utilizing anchoring and screening effects of amino and electronic regulation and control and capture effects of carboxyl; according to the present invention, by combining the pre-complexing, the pressurized digestion and the heat treatment activation process, the high specific surface area is maintained while the thermal stability of the modification layer is reinforced, the prepared desulfurization agent can perform stable desulfurization in the wide temperature range of 30-350 DEG C, the competitive consumption of CO2 is inhibited, the calcium utilization rate is improved, and the desulfurization by-product mainly comprises calcium sulfate so as to be directly subjected to resource utilization.

The invention discloses a method for rapidly and accurately determining the content of calcium and phosphorus in tricalcium phosphate by using an X-ray fluorescence method. Compared with a traditional chemical analysis method, the method is easy and convenient to operate and short in service time, and does not need a complex pretreatment process. The content of calcium and phosphorus in the sample can be rapidly and accurately determined only by dissolving the sample in dilute nitric acid and adopting an XRF (X-Ray Fluorescence) sample pool solution method. Researches show that the impurities in tricalcium phosphate, such as hydroxyapatite and calcium pyrophosphate, do not affect the XRF determination result, so that the problem of low calcium content caused by impurity interference in the traditional EDTA titration method is avoided.

This invention relates to the field of dairy processing technology, and discloses a low-salt, high-calcium cheese and its preparation method. The cheese uses pasteurized milk as the main raw material, combined with compound edible salt, rennet, specific fermentation strains, potassium citrate, casein phosphopeptide-whey calcium chelate, lactase, and novel functional excipients. The preparation method includes steps such as raw material pretreatment and standardization, fermentation and lactose degradation, curing and cutting, heating and whey removal and salting, molding, pressing and aging stabilization, functional enhancement and quality control. Through innovative process coupling and the introduction of new technologies, the cheese achieves synergistic optimization of low salt, high calcium, sugar-free, and lactose-free properties, while simultaneously improving product functional characteristics and storage stability. This invention solves the technical problems of existing cheeses, such as high salt content, low calcium absorption and utilization rate, lactose residue, poor texture and flavor, limited functionality, and easy deterioration during storage, making it suitable for industrial production and consumption by all population groups.

The invention discloses a preparation method of surface modified halloysite-oyster micro powder, and belongs to the technical field of adsorption materials. The preparation method of the surface modified halloysite-oyster micro powder comprises the following steps: mixing halloysite powder and oyster shell powder to obtain mixed powder; mixing the mixed powder with MgO in an alkaline solution 1, carrying out fluxing modification to obtain pretreated powder, and calcining to obtain calcined powder; and putting the calcined powder into an alkaline solution 2, activating, then putting into an L-lysine aqueous solution, and reacting to obtain the halloysite-oyster micro powder. According to the invention, the problems of low reaction activity, low calcium oxide conversion rate, low porosity, small specific surface area and small pore volume in the calcination process of the oyster shell powder are solved, and the adsorption performance of the product is greatly improved. The problem of biocompatibility of the oyster micro-powder in application is solved through control and surface modification treatment of crystal configuration transformation of the oyster micro-powder in the calcining process.

The application discloses a probiotic calcium tablet and a preparation method thereof. The probiotic calcium tablet comprises the following raw materials in parts by weight: a calcium compound 40-60 parts; a probiotic compound 10-20 parts; an absorption promoter 15-25 parts; a stabilizer 8-15 parts; and a flavor modifier 5-10 parts. The application can solve the problems of low calcium absorption rate and easy inactivation of probiotics in the prior art.

The present application relates to the technical field of flue gas pollution prevention and control, and discloses a high-activity calcium-based powdery desulfurizer and a preparation method thereof, aiming to solve the problems of invalid consumption, low calcium utilization rate and difficulty in resource utilization of desulfurization by-products of the existing calcium-based desulfurizer caused by high-concentration CO2 competition reaction, the modifier of amino silane coupling agent and organic carboxylic acid is used to build an interface layer with SO2 selective recognition function on the surface of quicklime, the effective repulsion of CO2 and the preferential adsorption of SO2 are realized by using the anchoring and screening effect of amino and the electronic regulation and capture effect of carboxyl; the pre-complexation, pressurized digestion and heat treatment activation processes are combined to strengthen the thermal stability of the modification layer while maintaining the high specific surface area, the prepared desulfurizer can stably desulfurize in the wide temperature range of 30-350 DEG C, the competition consumption of CO2 is inhibited, the calcium utilization rate is improved, and the desulfurization by-products are mainly calcium sulfate, which can be directly resourceized.

The application discloses an iminodisuccinic acid salt product with high copper chelation value and high calcium chelation value, and adopts a maleic anhydride process to produce the iminodisuccinic acid salt product, wherein the mass dosage molar ratio of L-aspartic acid, maleic anhydride and sodium hydroxide in raw materials is controlled to be 1:(1.03-1.06):(3.4-3.7), and the holding temperature of an ammonia addition reaction is controlled to be 100-105 DEG C, and the holding time is 12-14 hours. The iminodisuccinic acid salt product can make the calcium chelation value reach 330 mg / g or more while ensuring that all indexes of the product meet the requirements of industry standards, and can greatly improve the situation that a user adds a large amount of medicament and adds frequently due to the low calcium chelation capacity of the iminodisuccinic acid salt in daily use.