129results about How to "Low expansion" patented technology

The invention discloses a process for preparing coal-based agglomerated activated carbon. The process has the following beneficial effects: the non-caking coal produced in the wide ditches is taken as a main raw material; the special caking coal type, namely gas-fat coal, is blended in the coal blending procedure; furthermore, the oxidation procedure is added in the process; the process parameters such as pulverized coal particle distribution, forming pressure, coal activation temperature and time and the like in the general production process are adjusted; at the same time, the slow carbonization technology is used instead of the traditional rapid carbonization procedure; and oxygen-enriched air is fed into activation equipment. The coal-based activated carbon prepared by the process can ensure the product strength and bulk density on the basis of satisfying the iodine adsorption of the activated carbon and is better in industrial application value.

The invention discloses a lithium ion capacitor which comprises a membrane, a lithium ion supplying source and a shell and further comprises a cathode piece, an anode piece and organic electrolyte containing lithium. Micro-expansion graphite materials are adopted for the cathode piece to serve as cathode active materials. The micro-expansion graphite materials, a conductive agent and a binding agent are evenly mixed in a solvent according to the mass ratio of 80-90:4-8:6-12, prepared into slurry to be coated on the positive face and the reverse face of a copper foil current collector and dried. The coating thickness of the single face ranges from 30 micron to 100 micron, roll-in is conducted on electrode pieces through a roller press, and the cathode piece of the lithium ion capacitor can be obtained by cutting the electrode pieces obtained after the roll-in is conducted through a dividing and cutting machine.

The invention relates to a refractory material, and in particular relates to a silicon carbide, mullite and andalusite spray coating for a hot-blast stove dome, and the silicon carbide, mullite and andalusite spray coating is used for solving the problems that a casting material adopted for a lining of the hot-blast stove dome in the prior art is difficult in construction and short in service life. The spray coating comprises the following components in parts by mass: 15-25 parts of fused calcium aluminate cement, 0.1-0.3 part of plasticizer, 30-35 parts of mullite with the particle diameter of 3-5mm, 15-23 parts of andalusite, 8-12 parts of silicon carbide with the particle diameter of 0-1mm, 5-8 parts of zirconite and 1-3 parts of aluminum dihydrogen phosphate powder. The andalusite, mullite and silicon carbide are used as main raw materials, so that the creep resistance and low expansion of the spray coating are strengthened; the petrochemical reaction of the andalusite is irreversible at a use temperature, so that the thermal shock resistance of the spray coating is improved, the spray coating has the advantages of good acid corrosion resistance, good volume stability, small high-temperature thermal expansion coefficient and good thermal shock resistance, poor phenomena of masonry deformation, depression, distortion and the like of the lining of the hot-blast stove dome under the long-term high-load working condition are avoided, and the service life of the hot-blast stove dome is prolonged.

The invention discloses a processing method for cleaning perlite. The processing method comprises the following steps: weighing raw materials consisting of, by mass, 68 to 70% of silica, 12.5 to 15% of alumina, 1 to 1.5% of iron oxide, 3.5 to 4% of sodium oxide, 0.5 to 2% of calcium oxide, 3 to 3.5% of potassium oxide, 0.1 to 0.4% of manganese oxide and 4 to 6% of water, with the balance being perlite ore sand; preheating and retaining the raw materials in a preheating furnace with a temperature of 300 to 350 DEG C for 20 to 25 min; then adding the preheated raw materials into an expansion generation furnace and carrying out contact combustion at a temperature of 950 to 1000 DEG C; and carrying out retention for 1 to 5 s after occurrence of expansion so as to prepare the cleaning perlite. The cleaning perlite prepared in the invention has a whiteness as high as more than 98, uniform particle sizes, an average particle size of 1 mm and a porous microstructure, is light, loose and soft, can be crushed by slight pressing of fingers, shows water and oil absorbing ability and good cleaning effect and can be widely used as a raw material for daily washing chemicals like a liquid soap or a hand cleaner.

The invention discloses a structure of an asphalt pavement applicable to very heavy traffic. A wearing layer of the structure adopts 4cm of SBS (styrene butadiene styrene) modified Superpave 12.5 type or AC-13 type modified asphalt concrete; a middle layer of the structure adopts 8-10cm of SBS modified dense gradation LSAM (large stone asphalt mixture)-25; an anti-fatigue layer of the structure adopts 6cm of rich oil LSAM-20 asphalt concrete; a base layer of the structure adopts 36cm of anti-crack stabilized cement; and a subbase layer of the structure adopts treated original cement concrete pavement and treated original asphalt pavement or 18cm of anti-crack stabilized cement. The asphalt pavement structure resists the breaking such as penetrating, cracking, loosing, deforming and the like, resists high-temperature permanent deformation, resists fatigue loading damage, disperses the load, and slows down the reflection crack, so that the problems of rutting deformation resistance and the durability of the very heavy traffic asphalt pavement can be solved, and the service life of the asphalt pavement can be prolonged.

A thermal barrier coating material, containing a metal binding layer laminated on a base material and ceramic layer laminated on the metal binding layer, the ceramic layer comprising partially stabilized ZrO2 which is partially stabilized by additives of Dy2O3 and Yb2O3.

The present invention relates to one kind of composite solid protecting slag with double function for stainless steel cast mold, and features that the composite solid protecting slag consists of: calcium oxide 10-25 wt%, sodium oxide 4-8 wt%, magnesium oxide 15 wt%, Al2O3 10-20 wt%, silica 30-45 wt%, ferric oxide 1-3 wt%, calcium difluoride 5-10 wt%, and carbon 1-3 wt%. The present invention features that the composite solid protecting slag includes heat insulating material with low carbon content, high expansion coefficient and light expanded weight for floating and has no need of adding heating material and heat insulating material, resulting in raised steel ingot quality and steel material utilizing rate.

The invention discloses ion response gel applicable to cement silicate self-repairing systems, a preparation method and an application. Preparation comprises the following steps: preparing a biogel solution containing a polyhydroxy complexing structure; dropping the biogel solution to a divalent cation coagulating bath under stirring, and performing standing and drying to obtain the gel. Water isadopted as the solvent, so that little pollution is produced, cost is low, and the method is simple. The ion response gel based on water swelling and deposition reaction with divalent ions is applicable to various self-repairing systems and has low dependence on external repairing conditions. The expansibility is low in an initial hydration stage under the ion response action, and mechanical property loss of a cement matrix is reduced greatly; by the deposition reaction of the internally crosslinking divalent cations with the ambient environment, deposition of a self-repairing product is accelerated, and interfacial adhesion between the self-repairing gel and the cement matrix is improved. Subjective time of repairing is shortened by means of crack sealing and deposition of the self-repairing product, and the gel can adapt to short-time repairing work and can be used independently.

The inventive soft polyurethane foam material for bulk solid consolidation is prepared from polyol, isocyanate, catalyst, cross-linking agent, foaming agent, foam stabilizer, antioxidant and flame retardant by proportionally mixing and reacting. The soft polyurethane foam material is characterized in that the polyol has average functionality of 2-6 and average molecular weight of 3,000-10,000, and includes at least partially polyoxyalkylene polyol with high molecular weight of 6,000-12,000. The soft polyurethane foam material has the characteristics of high density, bonding strength, tearing strength and resilience, and low compression permanent deformation; and is suitable for soft consolidation of bulk solid such as railway ballast and graded broken stones for road.