358results about How to "Low steam pressure" patented technology

The invention discloses an ultra-high performance hybrid fiber concrete shield segment and a preparation method thereof. The ultra-high performance hybrid fiber concrete shield segment is of a reinforced concrete structure which consists of a steel skeleton and concrete, wherein the reinforcement ratio of used main reinforcements is 0.5%-1.0%, the distances of the main reinforcements are 150-300mm, the grades of steel reinforcements are not less than three, the smallest steel reinforcement distance of distributed reinforcements is 400mm, the biggest steel reinforcement distance of used distributed reinforcements is 2000mm, and the grades of the steel reinforcements are not less than two. The ultra-high performance hybrid fiber concrete shield segment is made from ultra-high performance hybrid fiber concrete, and comprises cementitious materials, sands, crushed stones, steel fibers, synthetic fibers, water reducer, defoamer and water. The ultra-high performance hybrid fiber concrete shield segment is less in dosage of the steel reinforcements and concrete and high in early strength, can prevent steam preservation, reduces energy consumption, and is green, energy-saving and environmentally friendly. The ultra-high performance hybrid fiber concrete shield segment is strong in anti-burst performance when having a fire, excellent in toughness and crack resistance and excellent in durability, enables edge joints not to easily break, and overcomes the defects of traditional segments.

The invention discloses an electrodeposition method, an electrodeposition solution and a method for preparation of a rare earth permanent magnetic material by electrodeposition. Being used for deposition of heavy rare earth elements on an R<2>-T-B type sintered mother alloy surface, the method comprises the steps of: 1. providing an electrodeposition solution, which comprises a heavy rare earth element containing main salt, an induction salt inducing heavy rare earth element deposition and an organic ionic liquid serving as the solvent, wherein the main salt is a tetrafluoroborate of heavy rare earth element; and 2. subjecting the R<2>-T-B type sintered mother alloy to electroplating in the electrodeposition solution, and controlling the temperature of the electroplating process at 0-200DEG C. According to the invention, heavy rare earth elements can deposit rapidly on the R<2>-T-B type sintered mother alloy surface, thus saving the electrodeposition process time and improving the production efficiency. The plating layer thickness is larger and can reach 10-40 micrometers.

The invention discloses a metallurgical pellet compound binding agent. The compound binding agent comprises the following components in percentage by weight: 45 to 50 percent of dust generated in blast furnace ironmaking and sintering production processes, wherein the dust is grounded to ensure that more than or equal to 80 percent of the dust has the particle size of 0.043 mm, the TFe in the dust is more than or equal to 60 percent, and montmorillonite in the dust is more than or equal to 20 percent; 10 to 15 percent of cassava meal of which more than or equal to 80 percent has the particle size of 0.043 mm; 10 to 15 percent of clay of which more than or equal to 80 percent has the particle size of 0.043 mm; 15 to 20 percent of fluorspar powder of which more than or equal to 80 percent has the particle size of 0.043 mm; and 4.5 to 5.5 percent of carboxymethylcellulose sodium of which more than or equal to 80 percent has the particle size of 0.043 mm. The carboxymethylcellulose sodium of the compound binding agent can be replaced by caustic soda and special-grade wheat flour. The components are uniformly stirred according to the percentage by weight to prepare the pellet compound binding agent; and during the production of pellets, 0.8 to 1.2 percent of 0.5 percent replaceable bentonite is added, and not only a requirement on pellet production can be meet, but also the used amount of the bentonite is reduced, thereby fulfilling the aims of improving the grade of pellet iron ores and simultaneously improving blast furnace coefficients.

The invention discloses a method for catalyzing ethyne hydrochlorination reaction by utilizing a metal nanoparticle / ionic liquid system. The method comprises the steps that a metal nanoparticle / ionic liquid phase catalytic system is prepared, ionic liquid is surface activity ionic liquid, under the temperature ranging from 60 DEG C to 120 DEG C, hydrogen chloride is pumped into the metal nanoparticle / ionic liquid phase catalytic system, activation is carried out, warming is carried out until the temperature ranges from 140 DEG C to 220 DEG C, ethyne and the hydrogen chloride are pumped, the reaction is carried out, and after processing is carried out, a chloroethylene product gas is obtained. The special surface activity ionic liquid and a metal nanoparticle are subjected to in-situ reaction or compounding, the metal nanoparticle / ionic liquid system is obtained, the metal nanoparticle / ionic liquid system is utilized to catalyze the ethyne hydrochlorination reaction, the ethyne converting rate can reach up to 99% in a maximum mode, the chloroethylene selectivity is larger than 99.5%, and the catalytic system has the best cycling stability.