310 results about "Low calcium" patented technology

A low calcium sensitive (calcium stable) high acyl gellan gum is prepared for enhanced colloidal stability in beverages. The low calcium sensitive high acyl gellan gum has superior suspension performance for colloidal stability compared to other high acyl gellan gums. The low calcium sensitive high acyl gellan gum is prepared by adjusting the pH of a gellan fermentation broth (polymer solution) prior to pasteurization and reducing the pasteurization hold time compared to conventional pH levels and hold times.

In one example of an embodiment of the invention, a method for producing an aggregate is disclosed comprising mixing sewage sludge from a waste water treatment facility with a non-coal combustion ash silicoaluminous waste material, agglomerating the mixture to form an agglomerate, and pyroprocessing the agglomerate to form an aggregate. The waste material may comprise municipal solid waste incinerator bottom ash, incinerator fly ash, incinerator filter dusts, cement kiln dusts, waste glass, blast furnace slag, kiln dusts, and/or granite sawing residues, for example. The method may further comprise milling the waste material prior to mixing. Preferably, the milling is wet milling. Pyroprocessing of the agglomerate may take place in a rotary kiln. The resulting aggregate may be a lightweight or a normal weight, sintered or vitrified aggregate. Aggregates and methods for making aggregates of high and low calcium silicoaluminous materials are also disclosed.

A heart valve prosthesis 4 for human implantation fabricated from bovine pericardial material which is harvested from a region of incipient low calcium content or other material, wherein pre-forming and fixing of the leaflets 5 of the valve to create a rapid change in direction of the surface modifies the stresses within the material leading to a reduction of the peak tensile stress magnitude and concomitant in-use calcification thereby to increase longevity of the valve,

In accordance with an embodiment, a method for producing an aggregate is disclosed comprising mixing IBA and a second, silicoaluminous material having a calcium content less than the IBA. The method further comprises agglomerating the mixture, such as by pelletizing, and pyroprocessing the agglomerates, such as by sintering or vitrification, to form the aggregate. The second material may be a clay, such as bentonite or kaolin, a mining waste, such as granite sawing residues, waste glass, or furnace bottom ash, for example. The addition of the second material has been found to facilitate production of lightweight and normal weight aggregates. Preferably, the IBA or the mixture of IBA and the second material are wet milled prior to agglomeration. A lightweight sintered aggregate comprising IBA and the second material and an aggregate comprising IBA and the second material are also disclosed.

The invention relates to a method for preparing manganese sulfate. The method comprises the following steps: quantitatively adding sulfide with reducibility into a manganese dioxide ore in a reaction molar ratio for sufficient reaction, determining a reaction end point, and separating and washing a solid-phase resultant; reacting the solid-phase resultant with 9 to 12mol/L H2SO4, controlling the reaction end point to the pH of between 3 and 5, controlling the concentration of MnSO4 in the reaction liquid in a range of between 300 and 400g/L, performing solid-liquid separation after the reaction is completed; acidizing the separated solution by H2SO4 until the pH value of the solution is between 2 and 3, adding hydrogen peroxide into the solution and heating the mixture, precisely filtering and removing the part of solid phase; and distilling, concentrating, crystallizing and dehydrating the filtrate to prepare the manganese sulfate. The method can prepare acid soluble manganous oxide and ensure that various heavy metals can generate insoluble sulfides so as to solve the problem of completely separating heavy metals and obtain the manganese sulfate with low calcium magnesium and low heavy metals.

The present invention relates to methods for producing low fat spread emulsions stabilised with dairy proteins. The water phase is stabilised by heat denatured whey proteins at low calcium concentrations. After heat treatment pH of the water phase is adjusted to neutral or acid conditions. The present invention also relates to methods for producing a whey protein product that can be used as a stabilising food ingredient.

The invention provides a steel slag treating method comprising the following steps of: directly mixing thermal-state revolving furnace steel slag with blast furnace slag in an arc furnace in proportion, adjusting the molten slag in the furnace into a proper temperature by virtue of the arcing of the arc furnace, and stirring the molten slag by virtue of arc disturbance, so that acidic oxide and basic oxide in the molten slag are sufficiently reacted with each other; reacting free calcium oxide and free magnesium oxide in the raw steel slag with silicon dioxide component and low-calcium calcium silicate in the blast furnace slag to generate safe calcium silicate and magnesium silicate, quenching the molten slag to form glass-state solid slag which is higher in hydration reactivity and free of short-term or long-term inflation harm, and further finely grinding the solid slag into slag powder which can be safely used for related building material as the blast furnace slag. According to the method, the damage caused by the free calcium oxide and free magnesium oxide in the steel slag can be removed, and a basis is provided for the whole use of the steel slag. The heat energy of the thermal-state molten slag can be sufficiently used, so that the energy source can be saved, the energy consumption can be reduced, the cost can be reduced, and the discharge of CO2 can be reduced, and the method is extremely high in social meaning and economic meaning.

The invention discloses low-energy-consumption and low-emission cement and a preparation method and application thereof. Cement clinker mainly comprises the following minerals in parts by weight: 35-65 parts of C2S, 20-50 parts C4A3S and 5-15 parts of C4AF. A corresponding green stock consists of the following components in parts by weight: 30-60 parts of CaO, 25-35 parts of SiO, 5-35 parts of Al2O3, 1-6 parts of SO3 and 1-10 parts of Fe2O3. The cement clinker is a product which is prepared by calcining limestone, alumina and clay or sandstone and gypsum serving as raw materials at the temperature between 1,280 DEG C and 1,300 DEG C for 45-70 minutes by combining the advantages of low calcium content, low-temperature baking and high later strength of a belite mineral, low-temperature baking and high later strength of anhydrous calcium sulphoaluminate, and the like. The cement product has the advantages of excellent performance, low energy and resource consumption and low carbon dioxide emission, can play an important role in the field of construction, and has a wide application prospect.

The invention provides an inorganic polymeric material used to fixedly seal heavy metal wastes, which is an inorganic silicon-aluminum polymeric material used in the environmental protection field. The material comprises the following compositions in weight percentage: 9.9 to 35.1 percent of metakaolin, 3.94 to 27.6 percent of ore slag, 0.1 to 9.9 percent of active low calcium silicon-aluminum material, 9.6 to 10.6 percent of alkali excitant and 50.0 to 54.7 percent of sand. The material has the advantages of high doped quantity of the heavy metal wastes, high fixing seal efficiency, wide source of raw materials, convenient preparation and processing, high mechanical strength, excellent durability and low cost.

The invention discloses anti-erosion low calcium portland cement and a preparation method thereof. The anti-erosion low calcium portland cement comprises clinker and gypsum according to a weight ratio of 96.5: 3.5 to 94.5: 5.5. Minerals of the cement comprises, by weight, 35.03-49.51% of C3S, 25.13-39.00% of C2S, 0.21-8.84% of C3A, 8.2-19.2% of C4AF and 1.71-9.24% of MgO. The cement has good anti-erosion performances, can effectively prevent seawater erosion of concrete engineering, has small dry shrinkage and good anti-cracking ability, improves a service life of oceanographic engineering, and has high early strength. Compared with the existing low-heat portland cement, the anti-erosion low calcium portland cement is conducive to shortening of a concrete work form stripping period and processing progress.

A low-calcium-cementitious material having a calcium oxide content less than or equal to 10 wt % which is processed at room temperature into a low calcium cement mainly composed of mullite and a method manufacturing of the low calcium cement are provided. The low-calcium-cementitious material includes low calcium fly ash, an alkaline agent, and a congealing agent, wherein the calcium oxide content of the low-calcium-cementitious material is less than or equal to 10 wt %. The low calcium fly ash has a calcium oxide content less than or equal to 10 wt %. The low calcium cement manufacturing method includes providing a low calcium fly ash having a calcium oxide content less than or equal to 10 wt %; providing an alkaline agent; providing a congealing agent; and mixing the low-calcium-content fly ash, the alkaline agent, and the congealing agent and standing the mixture at room temperature to form a low calcium cement.

The invention belongs to the technical field of building materials, particularly relating to high-calcium fly ash concrete. The high-calcium fly ash concrete comprises the following raw materials by weight in per cubic meter of concrete: 144-175 kg of mixing water, 224-480 kg of cement, 35-135 kg of high-calcium fly ash, 1007-1120 kg of gravels, 671-804 kg of sand, 1.7-9 kg of water reducing agents, 0-110 kg of low-calcium fly ash and 0-110 kg of slag powder, wherein the mixing water is temporary hardwater, and the concentration of HCO3<-> in the mixing water is greater than 300 mg/L. The concrete has the characteristics of easy production and high operability, the high-calcium fly ash resource can be fully utilized, and the poor stability is eliminated.

A burn-free fly ash ground polymer cement is characterized in that the cement contains the following components with the weight percentage of 65-86 percent of low-calcium fly ash, 4-20 percent of calcium containing compound, 10-18 percent of alkali excitant and 0-5 percent of admixture. And the calcium containing compound is one or a mixture of more than two of phosphorous slag, kiln dust or lime; the alkali excitant is the composite of NaOH or KOH with rapidly dissolved powdery sodium silicate, liquid silica sol and industrial water glass; the admixture is early strength agent and/or water reducing agent.

The invention relates to a method for circularly purifying manganese sulfate and manganese carbonate. The method comprises the following steps: A, stirring manganese sulfate solution at the temperature of between 40 and 80 DEG C, and adding ammonium bicarbonate into the solution for synthesis, controlling the synthesis end point to be an equimolar reaction, separating solid, and washing the solid with hot water to prepare manganese carbonate; B, adding the prepared manganese carbonate into 6 to 12mol/L H2SO4 for reaction, controlling the pH value of the reaction solution to be between 1 and 2, and heating and boiling the solution; C, adding the manganese carbonate prepared in the step A into the reaction solution in the step B, and adjusting the pH value of the solution back to be 4 to 5; and D, performing solid-liquid separation on the reaction solution, distilling and crystallizing the prepared filtrate, and drying the crystal to prepare the manganese sulfate. The circularly purifying method can prepare high-purity manganese sulfate and manganese carbonate with low calcium magnesium and low potassium and sodium.

The invention discloses a cement plate composite modifier, and belongs to the field of composite modifier production. The composite modifier is composed of a hardening agent, an early strength agent, an accelerator, a water-retaining agent, a water reducer, a water repellent, and polymer. Compared with the prior art, the provided composite modifier can solve the problems that the demoulding strength of cement plate is low, the setting time is long, the cement plate secretes water, and the cement plate is brittle; moreover, the modifier can avoid or reduce the risk that the steel bars are corroded by chlorine ions and sulfate ions; at the same time, the activity of low-calcium fly ash is effective excited, a scheme is provided for the large mixing amount utilization of low-calcium fly ash, and the product cost is reduced.

The invention relates to the field of medical food and discloses an aquatic collagen peptide food used for adjuvant therapy of osteoporosis and arthritis. Every 100g of the food contains multiple nutritional ingredients as follows: 9-11g of cod skin collagen protein peptide powder, 4-6g of squid skin collagen protein peptide powder, 2-3g of whey protein powder, 2-3g of soybean protein powder, 9-11g of MCT fat, 2-3g of soybean oil, 58-62g of carbohydrate and other vitamins and microelements. The aquatic collagen peptide food takes cod skin collagen protein peptide powder, squid skin collagen protein peptide powder and whey protein powder as main raw materials and has relatively high digestive absorptivity, and collagen protein peptide can promote bone formation and reinforce a bone collagen structure at low calcium level, so that bone strength is improved; bone metabolism can be improved, and ossification can be enhanced; and bone diseases such as the osteoporosis, hyperostosis and swelling and pain of bone joints can be prevented.

The invention provides a PVA (polyvinyl alcohol) fiber reinforced superhigh-toughness polymer-based composite material. The PVA fiber reinforced superhigh-toughness polymer-based composite material is prepared from the following raw materials in parts by weight: 542 parts of low-calcium fly ash, 136 parts of high-calcium fly ash, 0 to 20 parts of metakaolin, 183 to 203 parts of quartz sand, 160 parts of water, 38 parts of sodium hydroxide, 14 to 17 parts of PVA fiber, and 173 parts of sodium silicate. The invention also provides a preparation method of the superhigh-toughness polymer-based composite material. The superhigh-toughness polymer-based composite material has the advantages that cement is replaced with a large amount of industrial waste slag fly ash, industrial wastes are changed into valuables, the environment is effectively protected, the consumption of energy source is decreased, and the emission of carbon dioxide is reduced; the toughness of the polymer-based composite material is reinforced by the PVA, the defect of poor ductility of the traditional polymer-based composite material is overcome, and the polymer-based composite material is conveniently popularized and applied in the engineering field of China.

The invention provides an aluminate cement material containing. Q phase mineral that weight percenge is 40-80. The invention cement material has advantages of excellent functin of early strength and quick hardening, low firing temp., chalk containing magnesium-silicon and low-grade bauxite can be used as raw material to produce the cement material with high aluminium and low calcium.

The invention provides a method for preparing titanium dioxide and iron oxide by using a fluoride purifying titanium-iron material. The method comprises the steps of mixing and heating a titanium-ironmaterial and a fluorine ammonium compound solution to obtain a mixture, wherein the fluorine ammonium compound is an ammonium fluoride or ammonium hydrogen fluoride; regulating the primary pH of themixture to obtain a first precipitate; separating the first precipitate and then regulating the secondary pH of the residual material to obtain a second precipitate; hydrolyzing the first precipitateat high temperature to obtain Fe2O3; roasting the second precipitate to obtain TiO2. By adopting the method, titanium and iron elements in the titanium-iron material can be thoroughly separated, and high-quality TiO2 and Fe2O3 pigment products are respectively obtained. The method is especially suitable for purifying and purifying treatment of high-calcium-magnesium titanium iron resources in a Panxi area (components and their analogs), materials with low calcium and magnesium impurity contents are obtained, namely titanium-rich materials, and titanium dioxide or titanium metal is produced fora subsequent sulfuric acid method and a chlorination method.

The invention provides a method for extracting vanadium from high-calcium and high-phosphorus vanadium slag. The method comprises the following steps of: crushing the high-calcium and high-phosphorus vanadium slag, and adding concentrated hydrochloric acid into the crushed high-calcium and high-phosphorus vanadium slag to carry out activating treatment, wherein the CaO/V2O5 content in the high-calcium and high-phosphorus vanadium slag is higher than 1, and the phosphorus content in the high-calcium and high-phosphorus vanadium slag is higher than 0.15wt%; filtering and separating to obtain a supernatant and low-calcium and low-phosphorus vanadium slag; regulating the pH value of the supernatant to 2.5-10, filtering to obtain ferric hydroxide, evaporating and concentrating the filtered solution, and then, cooling and crystallizing to obtain calcium chloride; roasting the low-calcium and low-phosphorus vanadium slag within the temperature range of 800-1500 DEG C to obtain clinker, and then, carrying out acid leaching to obtain a vanadium liquid; regulating the pH value of the vanadium liquid to 1-5, and then, adding soluble ammonium salt to enable vanadium to be settled to obtain ammonium vanadate; and calcining and decomposing the ammonium vanadate to obtain vanadium pentoxide. The method has the advantages that the vanadium element in the high-calcium and high-phosphorus vanadium slag can be effectively utilized, and two byproducts including the ferric hydroxide and the calcium chloride can be obtained.

The invention discloses a low-calcium silicate cement produced by using aluminum waste slag and a preparation method thereof. The low-calcium silicate cement comprises the following components in percentage by weight: 65 to 85 percent of limestone, 6 to 10 percent of the aluminum waste slag, and 9 to 25 percent of steel slag or iron slag. The method for preparing the low-calcium silicate cement comprises the following steps: (1) drying and treating the aluminum waste slag so as to dehydrate the aluminum waste slag; (2) adding the dehydrated aluminum waste slag, the limestone and the steel slag into a crusher according to the proportion, and crushing the materials; (3) adding the crushed materials into a cement rotary kiln, and heating and calcining the materials; and (4) adding a ball milling assistant into the sintered clinker, and ball-milling and packaging the mixture to obtain the low-calcium silicate cement. Compared with the prior cement, the low-calcium silicate cement produced by using the industrial wastes as the aluminum waste slag has higher mechanical strength, simultaneously has the characteristics of simple process, low sintering temperature and energy consumption of a unit product, and high rate of finished products, and is suitable for industrial popularization because the prior equipment is directly used.

The present invention discloses a method for treating pectin containing plant material. The fresh plant material is adjusted to a pH between 3.2 and 3.9 at a temperature below 90° C. to render the native pectin esterase in the plant material inactive. Thus, minimal deesterification takes place during transportation of the plant material, nor during subsequent washing and/or conventional drying of the plant material. Since the enzyme remains inactivated, the activity of the enzyme can be re-established at a later point by increasing the pH to above about 4.0. Pectin made from such treated plant material has a higher molecular weight and a lower calcium sensitivity than pectin made from the same plant material, which has not been subjected to said treatment.