8 results about "Tobermorite" patented technology

The invention discloses an artificial water purification filter material based on fly ash and a preparation method thereof. The artificial water purification filter material based on fly ash is prepared from the following raw materials in parts by weight through foaming and autoclaved curing: 80-90 parts of fly ash, 5-10 parts of a cementing material, 3-5 parts of an alkaline activator, 0.1-0.3 part of a foaming agent and water accounting for 45-60% of the total mass of dry materials. According to the artificial water purification filter material based on the fly ash and the preparation method thereof, the fly ash is used as a main raw material, resource utilization of a large amount of solid waste is achieved, the production cost is low, the carbon footprint is remarkably reduced, and through the synergistic effect of chemical foaming and autoclaved hydrothermal synthesis, the artificial water purification filter material is prepared. And a hierarchical pore structure which takes high-strength tobermorite as a framework and is rich in communicated mesopores is created. The structure is different from aerated concrete for building materials, and is specially used for optimizing mass transfer and adsorption processes in water treatment.

The invention discloses a preparation method and application of aluminum ash-based long-term strength increase type high-alumina cement. According to the method, citric acid and tartaric acid are utilized for compound modification of aluminum ash, consumption of activated aluminum, dissolution of heavy metal ions and removal of soluble salt and AlN, and harmless treatment of the aluminum ash is achieved; mixing the pretreated aluminum ash with steel slag, ash calcium powder and other materials in proportion, calcining at the high temperature of 1350-1450 DEG C for 1 hour, and promoting a metastable-state hydration product to be converted into a stable state through an extremely cold modification process to generate garnet and tobermorite gel; the solid waste activity is improved through mechanical activation of a planetary ball mill; the high-alumina cement with the long-term strength increasing characteristic is prepared. The invention also provides application of the high-alumina cement in jet reinforcement, and provides slurry which is prepared from the high-alumina cement and can be used for jet reinforcement of mine surrounding rocks. The method not only solves the environmental problem of industrial solid wastes such as aluminum ash, but also realizes resource utilization of the solid wastes.

The invention relates to a coal gangue-based well cementation material and a preparation method thereof, and belongs to the technical field of oil and gas well cementation engineering materials. The material is composed of coal gangue-based high-activity powder, magnesium hydroxide, calcium hydroxide, a reinforcing agent and a well cementation admixture. Wherein the coal gangue-based high-activity powder is prepared by calcining and grinding coal gangue, limestone and siliceous tailings according to a specific ratio. By optimizing the material composition and adding the magnesium-based component, the formation of a stable phase tobermorite in a high-temperature environment (more than or equal to 200 DEG C) is effectively promoted, so that the well cementing material keeps stable mechanical properties and volume stability at high temperature. Experiments show that the compressive strength of the material is still kept at 50 MPa or above after the material is aged at 250 DEG C for 28 days, strength decline is avoided, and the material is far superior to a traditional high-temperature well cementing material. Meanwhile, high-value utilization of solid waste resources such as coal gangue is achieved, and remarkable economic and environmental benefits are achieved.

To provide a method of manufacturing a hardened body containing crystalline tobermorite in a high content by effective utilization of fly ash.SOLUTION: A manufacturing method of a crystalline tobermorite-containing hardened body includes applying autoclave curing to a kneading material containing a siliceous raw material containing alkanolamine-blended fly ash and cement.SELECTED DRAWING: None

This invention relates to a high-temperature resistant oil well cement slurry system and its preparation method based on solid waste synergistic modification, belonging to the field of oil and gas well cementing materials. This invention employs synergistic modification with steel slag micropowder and electrolytic manganese slag to increase the 3-day compressive strength to over 20 MPa; API filtration loss is reduced to <50 mL through saturated adsorption of a water-reducing agent by steel slag micropowder; and C2S is directionally converted into calcium silicate (XRD quantitative >75%) under high pressure by nano-silica sol and steel slag Fe2O3, achieving a 28-day strength retention rate of >90% at 150℃. This invention significantly reduces raw material costs and carbon emissions, solves the risk of annular flow in deep well cementing, and is suitable for oil well conditions at 150-180℃.

The invention discloses a calcium supplement material for autoclaved aerated concrete and application, and belongs to the technical field of materials. The calcium supplement material for the autoclaved aerated concrete is prepared from the following materials in percentage by mass: 5-25% of an expansion material; and 75%-95% of light-burned dolomitic limestone waste soil. The invention discloses application of the calcium supplement material for the autoclaved aerated concrete in preparation of the autoclaved aerated concrete. The calcium supplement material disclosed by the invention contains high-content calcium, so that the Ca content of the autoclaved aerated concrete can be supplemented, the effect of adjusting the calcium-silicon ratio is achieved, and the generation of tobermorite is ensured. Meanwhile, the problems of large volume-weight difference of the upper part and the lower part, non-uniform product quality, poor stability and the like caused by shrinkage and sinking of the green body in the standing process are solved, and the production process stability and the product quality of the aerated concrete are effectively improved.

The invention provides an aluminum oxide production method based on a Bayer process, and relates to the technical field of aluminum oxide production, and the aluminum oxide production method comprises the following steps: desiliconizing bauxite to obtain ore pulp; the ore pulp is dissolved out, and dissolved-out slurry is obtained; carrying out settling separation on the dissolved slurry to obtain red mud and fine liquid; tobermorite is prepared from the red mud; cooling the refined liquid, adding aluminum hydroxide seed crystals, and separating out aluminum hydroxide crystals from the refined liquid; settling and separating to obtain solid aluminum hydroxide and liquid; the liquid is a sodium aluminate solution and contains sodium carbonate, sodium oxalate and sodium vanadate impurities; roasting the solid aluminum hydroxide to prepare aluminum oxide; removing redundant moisture in the liquid to obtain an evaporation mother solution; and removing impurities from the evaporation mother liquor, and then recycling to a dissolution process. According to the method, the bauxite is desiliconized, the A / S can be increased, and the low-grade ore meets the dissolution requirement; the tobermorite is prepared from the red mud, and the red mud is utilized.

The application discloses a preparation method and application of aluminum ash-based long-term strength growth type high-aluminum cement. The method utilizes citric acid and tartaric acid to modify aluminum ash, consumes active aluminum, dissolves heavy metal ions, removes soluble salt and AlN, and realizes harmless treatment of the aluminum ash. Then, the pretreated aluminum ash is mixed with steel slag, lime powder and other materials in proportion, calcined at a high temperature of 1350-1450 DEG C for 1 hour, and then subjected to an extremely cold modification process to promote the metastable hydration product to transform into a stable state to generate water garnet and tobermorite gel. The activity of the solid waste is improved through a planetary ball mill mechanical activation. The high-aluminum cement with long-term strength growth characteristics is prepared. The application also provides application of the high-aluminum cement in jet reinforcement and provides a slurry of the high-aluminum cement for preparing jet-reinforced mine surrounding rock. The application not only solves the environmental problems of industrial solid wastes such as aluminum ash, but also realizes resource utilization of the solid wastes.