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Double-medium decoupling fracture damage blasting control method and auget

InactiveCN101363701AHighlight substantive featuresHigh static pressure resultant forceBlasting cartridgesBlastingEngineeringExplosive power
The invention relates to a method for controlling blasting by double-medium decoupling fracture and damage and a blasting cartridge thereof. The method adopts cylindrical explosive, detonator or primacord to explode a hole on a blasted rock body. The method is characterized in that water and air are simultaneously used in the hole to separate explosive, wherein, the water medium is aligned to the side of a free surface, while the air medium is aligned to the side of a reserved surface; the uniform distributing state of explosive energy can be changed by using the characteristics that the two media have different efficiencies of transmitting energy, thereby achieving the function of completely destroying one side and protecting the reserved surface during blasting, and forming a flat fracture surface. The blasting cartridge consists of an outer tube, an inner tube and a separating wall, wherein, the separating wall separates a cavity formed between the outer tube and the inner tube into a medium chamber for containing the water medium and a medium chamber for containing the air medium; and an explosive chamber for placing the cylindrical explosive is arranged in the inner tube. The invention has the advantages of easily operating, improving explosive power and agglomerating rate, protecting stability of wall rock, reducing harm of dust and noise, and the like, and can be widely applied to smooth blasting projects such as tunnels, side slopes, water conservancies, mining, and the like.
Owner:TAIYUAN UNIV OF TECH

Experimental device for measuring chemical reaction rate and activation energy

The invention discloses an experimental device for measuring chemical reaction rate and activation energy. The experimental device comprises a reaction container with a cover plate, wherein the reaction container is positioned on a magnetic stirrer; a reaction tube with a bottom is arranged in the reaction container; the upper end of the reaction tube is arranged on the cover plate, and the bottom of the reaction tube is suspended; a lifting movable separator is arranged in the reaction tube, so that the reaction tube is divided into a left reaction area and a right reaction area; a water bath area is formed in an area between the reaction container and the reaction tube; a water bath area water outlet is formed in the lower part of the water bath area; a reaction area water outlet is formed in the lower part of the reaction tube; two charging openings which correspond to the two reaction areas, a gas collection port which corresponds to any reaction area, and a water bath area water inlet are respectively formed in the cover plate; chargers are respectively arranged on the two charging openings; the gas collection port is connected with a gas collection device. The experimental device can accurately measure the chemical reaction rate and activation energy and is low in medicine consumption, simple in structure, convenient to operate and low in manufacturing cost.
Owner:CHONGQING UNIV

Floatation method for silica-calcium collophane with difficult separation

The invention discloses a floatation method for a silica-calcium collophane with difficult separation. According to the detailed technology, the floatation method includes the steps that (1) breaking and grinding are performed on the silica-calcium collophane; (2), a sulfate mineral negative ion collecting agent, a phosphate mineral negative ion collecting agent and a carbonate mineral negative ion collecting agent are respectively added into ore pulp for mixing and mineralizing, and air inflation is performed for reverse floatation; (3), magnesium removal phosphate ore concentrate is graded; (4), the ore pulp concentration of a coarsely graded phosphate ore concentrate is controlled, then sodium carbonate mineral positive ions and silicate mineral positive ions are respectively added for pulp mixing and mineralizing, and air inflation is performed for reverse floatation; (5), a finely graded phosphate ore concentrate and a desilication phosphate ore concentrate are mixed, and carbonate impurities and silicate impurities are mixed. The problems that because the carbonate impurities are removed only through single reverse floatation, the phosphate ore concentrate is not high in content and high in silicate impurity content, the requirement for the phosphate ore concentrate used for wet-process phosphoric acid can not be met, and then in the process that the silicate impurities are removed through reverse floatation, floatation froth is sticky, not prone to breaking and poor in ore pulp flowability due to the existence of a great deal of slurry are solved, and the floatation method is adaptive to the silica-calcium collophane and efficient in impurity removal.
Owner:YUNNAN PHOSPHATE CHEM GROUP CORP

Little-chlorine and little-pollution bleaching process for paper pulp biomimetic pretreatment

The invention relates to a little-chlorine and little-pollution bleaching process for paper pulp biomimetic pretreatment, in particular to a little-chlorine element chlorine-free bleaching (ECF) process for the paper pulp biomimetic pretreatment. The process is a novel little-pollution bleaching technology in the paper pulp biomimetic pretreatment and belongs to the technical field of paper making. The process mainly comprises the following steps of: (1) carrying out metal salen biomimetic pretreatment to paper pulp bleaching, wherein metal salen, pyridine, H2O2 and O2 are used for carrying out bleaching pretreatment to oxygen-removal kraft pulp in alkaline condition; and (2) carrying out subsequent little-chlorine and little-pollution bleaching, wherein paper pulp after the biomimetic pretreatment undergoes three-section bleaching treatment, i.e., a chlorine dioxide bleaching section, a chelation treating section and a hydrogen peroxide bleaching section. The process is simple and easy to implement, has remarkable effect and can improve the whiteness and the property of the paper pulp. Compared with the conventional little-chlorine bleaching procedures, the bleaching process uses less chlorine. Compared with the conventional CEH bleaching, the bleaching process can reduce the time for pulping.
Owner:KUNMING UNIV OF SCI & TECH

Pneumatic flotation machine with mechanical stirring

The invention discloses a pneumatic flotation machine with mechanical stirring, which comprises a cylindrical tank body flotation chamber, wherein a foam product collecting chute is closely fastened on the outer side of the upper end of the flotation chamber, and the outer side of the foam product collecting chute is connected with a concentrate pipe; a hollow shaft connected with a driving device is arranged in the flotation chamber, and the hollow shaft is fixed on the support through a bearing and bearing blocks, a bearing housing is arranged between the bearing blocks, an air inlet formedon the bearing housing is connected with an air inlet pipe, and an air inlet is formed on a hollow shaft corresponding to the bearing housing; the lower end of the hollow shaft is connected with a rotor which has an air outlet, and a stator is arranged on the outer side of the rotor; a feed tank is hoisted on the upper part of the flotation chamber, the feed tank is a tank body with an annular cavity, the annular tank body surrounds the outside of the hollow shaft, a feed inlet is formed on the upper part of the feed tank, and discharging nozzles are uniformly arranged on the lower part of the feed tank; and a tailing chamber is formed at the bottom part of the flotation chamber, and the tailing chamber is communicated with a tailing tank through a pipe. The machine is efficient, energy-saving and very adaptable and is long in service life and low in production cost.
Owner:张玮

Control method of diatomite ore scrubbing process

The invention discloses a control method of a diatomite ore scrubbing process and belongs to the technical field of mineral separation process control. The control method is characterized by including feeding quantity control, scrubbing density control, pH adjusting agent dosage control, scrubbing strength control, dispersing agent dosage control, sequence control and a controller. The method includes determining feeding quantity according to diatom content of diatomite ores, adjusting a water compensation motor-driven valve according to the feeding quantity, controlling the scrubbing density to be 30%-40%, adjusting a pH adjusting agent metering pump to enable the pH value of ore pulp to be 9-10, changing working efficiency of a first-slot scrubbing motor, a second-slot scrubbing motor, a third-slot scrubbing motor and a fourth-slot scrubbing motor of a scrubbing machine to control scrubbing strength, adding proper dispersing agent according to the scrubbing density to enable clay minerals to be in the suspension dispersing state which is favorable for the following centrifugal sedimentation and separation. The control method enables clay removing rate of the diatomite ores to be high, obviously improves hole plugging, remarkably improves specific surface area, is not large in breakage rate increase, and is especially suitable for scrubbing of clay minerals.
Owner:CHINA UNIV OF MINING & TECH (BEIJING)

Hard rock tunnel blasting excavation method

ActiveCN109813189AIncrease the speed of excavationImprove blasting cycle footageBlastingTunnelsRock tunnelPetrology
The invention discloses a hard rock tunnel blasting excavation method. The hard rock tunnel blasting excavation method comprises the steps that blasting holes are drilled in the rock of a tunnel faceand include cut holes, auxiliary holes, peripheral holes, bottom holes and empty holes, and at least one empty hole is formed in the periphery of each cut hole; the blasting holes are cleaned; explosives are put into the cut holes, the auxiliary holes, the peripheral holes and the bottom holes; a front stemming section, a resisting part and a rear stemming section are put into the remaining part of each cut hole in sequence, the hole opening of each cut hole is tightly wedged by a wedge, branches are arranged on each resisting part, each resisting part is pushed into the corresponding cut holein the forward direction, and the interiors of the remaining parts of the auxiliary holes, the peripheral holes and the bottom holes are plugged by stemming sections; blasting cap leg wires of the explosives are connected, and ignition and blasting are conducted; after the blasting is accomplished, and residue removal is conducted on the blasted tunnel face; and the operation is repeated until hard rock tunnel blasting excavation is accomplished. The tunnel blasting cyclical footage can be increased, and the tunnel excavation speed can be increased.
Owner:CHINA RAILWAY 18TH BUREAU GRP CO LTD
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