16 results about "Hydromagnesite" patented technology

The invention provides a method for preparing magnesium oxide by calcining magnesite, which comprises the following steps: introducing fuel into a decomposer or into the decomposer and an activity regulator, igniting, and discharging generated high-temperature flue gas after flowing through a multi-stage preheating unit, a drying unit and a tail gas separation unit, feeding a water-containing magnesite raw material into a dryer to be in contact with hot flue gas from a preheater so as to remove moisture; the dried material passes through a multi-stage preheater and is subjected to countercurrent flow heat exchange with high-temperature flue gas from a decomposer, so that the temperature of the material is increased; the preheated material is heated to the decomposition temperature in a decomposer, and magnesium carbonate is decomposed to generate magnesium oxide; separating the decomposed gas-solid mixture to obtain a high-temperature magnesium oxide solid; and performing countercurrent flow heat exchange on the high-temperature magnesium oxide solid and combustion-supporting air, and outputting cooled magnesium oxide. Through multi-stage countercurrent flow heat exchange and product sensible heat recovery, an efficient heat energy circulation system is constructed, and the fuel energy consumption in the calcination process is remarkably reduced; the method realizes flexible regulation and control of magnesium oxide product activity, and is suitable for continuous clean production of fine particle raw materials.

The present invention relates to the use of a storage stabilization agent for stabilizing an aqueous home care formulation upon storage, wherein the storage stabilization agent comprises at least two different water soluble or water dispersible ion sources selected from the group consisting of water soluble or water dispersible source of bismuth ions, water soluble or water dispersible source of lithium ions, water soluble or water dispersible source of magnesium ions and at least a water soluble or water dispersible source of alkali ions, wherein the water soluble or water dispersible source of alkali ions is selected from alkali carbonate and / or alkali bicarbonate and wherein the water dispersible source of magnesium ions is selected from magnesium carbonate or magnesite (MgCO3) and / or hydromagnesite (Mg5(CO3)4(OH)2·4H2O).

A porous filler for reducing the gas permeability of an elastomer composition, a process for producing the elastomer composition comprising the porous filler, and the elastomer composition itself. The porous filler is selected from surface-reacted calcium carbonate, precipitated hydromagnesite and mixtures thereof. The addition of the porous filler to the elastomer composition allows for reducing the gas permeability of the elastomer composition while retaining or improving the mechanical properties of the elastomer composition.

The present invention relates to a method of manufacturing a surface-modified material, wherein the method comprises the steps of applying a coating composition onto at least one surface of a substrate to form a porous coating layer thereon, wherein the coating composition comprises mineral particles selected from the group consisting of calcium carbonate, calcium phosphate, hydromagnesite, and mixtures thereof, and a binder, and infusing the porous coating layer with at least 150 wt.-%, based on the total weight of the porous coating layer, of an infusing liquid composition to form a contained liquid layer within and on the porous coating layer, wherein the infusing liquid composition is chemically inert to the substrate and the porous coating layer. Furthermore, the present invention relates to a corresponding surface-modified material, an article comprising the same, and the use of such materials.

This application discloses a magnesium-based cementitious material and a preparation method thereof, relating to the field of magnesium-based cementitious materials. The material is made from the following components: 80-120 parts magnesium oxide cement, 0.1-0.6 parts hydrating agent, 0.6-1.2 parts carbonating agent, 120-180 parts aggregate, and 50-60 parts water; the carbonating agent comprises one or more of sodium bicarbonate, sodium sesquicarbonate dihydrate, and hydromagnesite seeds. The application utilizes the hydrating agent and the carbonating agent to synergistically form a continuous network structure of hydrated magnesium carbonate within the magnesium-based cementitious material, filling the voids, thereby fixing carbon and improving the density and compressive strength of the magnesium-based cementitious material.

The invention provides magnesium-based fiber stone composite powder as well as a preparation method and application thereof, and belongs to the technical field of enhancement of natural stone ore powder. Natural hydromagnesite is adopted to replace traditional silane, so that the characteristics of heat resistance, ablation resistance, flame retardance, smoke suppression and the like of natural calcareous metasilicate can be improved, and multiple functions of the natural hydromagnesite are increased by combining various natural mineral powder; by recombining various natural organic matters and inorganic mineral powder, the added value and environmental protection property of the inorganic mineral powder can be remarkably improved, consumption of a large number of organic reagents and high-carbon emission in the preparation process can be effectively avoided, and the long-term evolution sustainability is good. The natural fibrous mineral powder, the natural hydromagnesite and the natural aldehyde derivative are organically combined, so that the problems of low comprehensive performance, low additional value and narrow application range of the powder in the prior art are solved.

The invention discloses hydromagnesite fractional precipitation and double-type compound silicon steel magnesium oxide and a preparation method thereof, and the preparation method comprises the following steps: mixing gradient-calcined light-boiled hydromagnesite with a hydrochloric acid solution to obtain a magnesium chloride solution; a-type magnesium oxide with the CAA activity of 20-50 s and B-type magnesium oxide with the CAA activity of 80-120 s are prepared by adding a precipitator ammonium bicarbonate or sodium hydroxide into a magnesium chloride solution through fractional precipitation, and the A-type magnesium oxide and the B-type magnesium oxide are regulated and controlled according to the physical compounding proportion to obtain the double-type compounded silicon steel magnesium oxide with the average particle size smaller than or equal to 3 microns, the purity larger than or equal to 99% and the CAA activity of 50-80 s. The method synergistically solves the contradiction between the silicon steel magnesium oxide hydration rate and the suspension stability, and is suitable for preparing the high-magnetic-induction oriented silicon steel annealing isolation coating.

This invention discloses a method for low-temperature roasting of magnesia from hydromagnesia, the resulting magnesium oxide, and its applications. The method includes: mixing a solution containing magnesia-chlorite with magnesia, drying and crushing the magnesia, followed by a one-step calcination to obtain magnesium oxide. The method provided by this invention ensures complete decomposition of magnesia while lowering the decomposition temperature, resulting in the production of magnesium oxide with higher activity and purity. It also effectively reduces energy consumption and CO2 emissions during the production process. Furthermore, the magnesium oxychloride cementitious material prepared using the aforementioned magnesium oxide exhibits superior mechanical properties.

The present invention discloses a preparation device for hydromagnesite composite flame retardant and a preparation process thereof, which relate to the technical field of material mixing, including a stirring barrel, and also including a power component arranged on the top of the stirring barrel and capable of adaptively connecting or disconnecting power output according to the degree of water drop, and a negative pressure component connected to the power component and performing cyclic negative pressure pumping through the power provided by the component. A stirring device for stirring and spraying is fixedly embedded at the center of the pulley, the top of the inner cavity of the stirring device is connected to a conical water baffle through a sealed bearing, and the outer bottom of the stirring device is connected to a water filter through a sealed bearing. During use, the power component can automatically fall into place and drive the negative pressure component to move. The negative pressure component can realize continuous and cyclic extraction of the bottom permeated and filtered mixed additives upward, so that they re-enter the interior of the stirring device for spraying from top to bottom.

Glass wool insulation comprises : -a collection of intermingled glass fibres in the form of glass wool, the glass wool having a structure formed from the intermingled glass fibres and air-filled interstices between the intermingled glass fibres, the glass fibres being present in the glass wool insulation in a quantity of at least 70%wt; - optionally an organic binder present in a quantity of less than 12%wt, the organic binder being distributed within the glass wool structure and serving to retain the collection of intermingled glass fibres in the form of glass wool; and - a fire-resistance enhancer notably selected from the group consisting of: hydromagnesite, magnesium hydroxide, brucite, huntite, dolomite, calcium carbonate and combination thereof, the fire-resistance enhancer being present in an amount of 1-15%wt and being distributed within the glass wool structure.

The present invention relates to a method for directly capturing carbon dioxide from the air. The method for directly capturing carbon dioxide from the air according to the present invention is characterized by comprising the steps of: reacting seawater desalination concentrate with an alkali solution to form and separate magnesium hydroxide in a solid state; adding magnesium hydroxide to water to create a reaction solution and injecting carbon dioxide to precipitate hydromagnesite; heating the reaction solution to precipitate magnesium carbonate and basic magnesium carbonate and capturing carbon dioxide discharged from the reaction solution; injecting air containing carbon dioxide into the reaction solution to lower the pH; heating the reaction solution again to precipitate magnesium carbonate and basic magnesium carbonate and capturing carbon dioxide discharged from the reaction solution; and repeating the carbon dioxide injection step and the second capture step repeatedly and continuously after the second capture step.

Glass wool insulation comprises:a collection of intermingled glass fibres in the form of glass wool, the glass wool having a structure formed from the intermingled glass fibres and air-filled interstices between the intermingled glass fibres, the glass fibres being present in the glass wool insulation in a quantity of at least 70% wt;optionally an organic binder present in a quantity of less than 12% wt, the organic binder being distributed within the glass wool structure and serving to retain the collection of intermingled glass fibres in the form of glass wool; anda fire-resistance enhancer notably selected from the group consisting of: hydromagnesite, magnesium hydroxide, brucite, huntite, dolomite, calcium carbonate and combination thereof, the fire-resistance enhancer being present in an amount of 1-15% wt and being distributed within the glass wool structure.

A process for producing magnesia can include contacting CO2-containing emissions with a magnesium-containing material to produce magnesium carbonate; subjecting the magnesium carbonate to calcination to produce a CO2 by-product and magnesia; and recycling at least a portion of the CO2 by-product for contacting the magnesium-containing material to produce the magnesium carbonate. The magnesium-containing material can include mining residues, such as phyllosilicate or chrysotile mining residue, and the magnesium carbonate produced can include precipitated nesquehonite that is subjected to calcination to produce the magnesia.

The application discloses a kind of water magnesite-based fire extinguishing powder and its preparation method and application.The fire extinguishing powder of the application includes the fire extinguishing powder includes modified water magnesite and dry powder additive;The modified water magnesite powder is the water magnesite powder with modifier on surface;The modifier is selected from MHCO3, and M is monovalent metal ion.The modifier is loaded to the surface of water magnesite powder in the application, and water magnesite powder is given chemical inhibition effect, and the fire extinguishing efficiency thereof is further improved on the basis of physical inhibition;And by adding other inert ingredients, the hydrophobicity and oleophobicity, flowability and dispersion effect of water magnesite powder are improved, and the agglomeration phenomenon is reduced, so that the comprehensive performance reaches the design standard of dry powder fire extinguishing agent specified by the state.

The present invention refers to a dry composition for chemical and physical sun protection, the composition comprising at least one mineral material selected from the group consisting of surface reacted calcium carbonate and / or hydromagnesite, and from 0.1 wt.-% to 100 wt.-%, based on the dry weight of the at least one mineral material of at least one lignin. Furthermore, the present invention refers to an emulsion comprising the inventive dry composition as well as the use of the inventive emulsion for chemical and physical sun protection in a cosmetic formulation.

The present invention relates to a zero-carbon and sulfur-free magnesia-based patching material based on the flow-promoting effect of crystal water, belonging to the technical field of refractory materials for hot patching of steelmaking converters. The product is made from the following raw materials in parts by weight: magnesite, magnesium chloride hexahydrate, strontium chloride hexahydrate, hydromagnesite and silica fume, which are mixed to form a basic patching material. The present application proposes a zero-carbon and sulfur-free magnesia-based patching material based on the flow-promoting effect of crystal water and its sintering property regulation method. After being heated, the patching material rapidly reacts to release a large amount of crystal water, and quickly forms a sol product with the silica fume particles in the system and the light-burned MgO particles in-situ decomposed from hydromagnesite. This can not only effectively bond the aggregate and matrix in the patching material, play a preliminary binding effect and improve the medium and low temperature strength of the patching material layer, but also accelerate the flow-promoting effect of the slurry on the aggregate. After the water evaporates and the sintering reaction is completed, a firm sintered layer of the patching material can be formed in the area to be patched of the furnace lining, thus achieving the purpose of quickly patching the furnace.