34results about How to "Reduce dust rate" patented technology

The invention belongs to the technical field of steelmaking and refining, and discloses a ladle refining slag modifier, a preparation method and a slag modifying method. The slag modifier comprises the following chemical components in percentage by mass: 30 to 60 percent of CaO, 30 to 60 percent of Al2O3, 2 to 10 percent of MgO2, 2 to 10 percent of B2O3, and less than 8 percent of impurities. The slag modifying method using the slag modifier comprises that: the slag modifier is hoisted to the front of a refining furnace after a steelmaking furnace discharges steels, and then is directly fed into ladles, or the slag modifier can also be fed into the furnace along with other slags at a refining station; the components of modifying slag are determined according to the ladle residue amount and components, desulfuration amount and steel deoxidation product amount; and the modifying slag for controlling the ladle slag comprises the following components according to the adding amount: 48 to 54 percent of CaO, 26 to 32 percent of Al2O3, 6 to 8 percent of MgO, 2 to 4 percent of B2O3, and 0 to 8 percent of SiO2, wherein the modifying slag is better if the content of the SiO2 is lower. The slag modifier has the capabilities of quickly manufacturing the slag, improving desulfuration and deoxidation of the refining slag and accommodating and absorbing deoxidation products, and is simple to prepare and convenient to store, transport and use.

The invention discloses a method for preparing electronic grade high-purity chlorine gas from industrial liquid chlorine. The method comprises the steps of: gasifying the industrial liquid chlorine, then performing multistage physical drying, adsorbing and removing carbon dioxide, performing compression-condensation, and rectifying for removing such gas with low boiling point as nitrogen gas, oxygen gas, hydrogen gas, carbon monoxide, methane and the like, thus obtaining the electronic grade high-purity chlorine gas with purity being over 99.999%. The method is low in cost and high in benefit, and products prepared by the method are high in purity and can be widely used for preparation of optical-fiber-communication, microelectronic and high-temperature superconducting materials.

The invention provides a method for industrially producing anhydrous lithium hydroxide balls, comprising the steps of dehydration drying, fine powder, ball forming of powder, sieving, drying, and thelike. Medicine grains, which do not cause powder falling and do not have irritating smell, are prepared from anhydrous lithium hydroxide by a powder forming process. When the anhydrous lithium hydroxide balls are applied to a CO2 absorbent, the absorption efficiency of carbon dioxide by the absorbent is tested to be 85% or more according to a coal standard MT454-2008.

The invention discloses a sintering combined oxygen-enriched side-blown smelting process of a vertical drying kiln in the technical field of environmental protection systems. The smelting process comprises the following steps of adding little lime and fine anthracite to copper and nickel-contained sludge, mixing the lime, the fine anthracite and the copper and nickel-contained sludge proportionally and stirring evenly to obtain a mixture; pelletizing the mixture by a pelletizer to obtain pellets, and adding the pellets evenly into the vertical drying kiln from a kiln crown by a feeding device,wherein the pellets move down by dead weight; adding obtained agglomerated cakes from the furnace top of an oxygen-enriched side-blown smelting furnace continuously together with inorganic hazardouswastes, such as waste anode scraps, quartz stone, limestone, non-ferrous metal smelting waste and incineration disposal residues; making obtained slag enter an electric slag cleaning furnace after theobtained slag is discharged from the oxygen-enriched side-blown smelting furnace, reheating and clarifying and separating the slag by the electric slag cleaning furnace, thereby clarifying and separating copper and nickel mechanically entrained in the slag once again, and discharging the slag from the electric slag cleaning furnace and performing water quenching to make the slag become water-quenched slag; and disposing generated flue gas by processes of waste heat recovery, shock chilling, bag dust collection, sulfur removal, denitration, fluorine and chlorine removal and the like, thereby realizing up-to-standard discharge.

The invention provides a coal seam water injection method of a coal mining working face. The coal seam water injection method of the coal mining working face is characterized by comprising the following steps that before mining operation, an air drill or an air coal drill is used for conducting wet water injection hole punching on a driving working face coal seam, the water injection holes are formed to be perpendicular to a coal wall along the working face, the distance away from the top is no smaller than 0.8 m, and the hole depth is 1.5-6.0 m; a hole packer is used for sealing the water injection holes, a water tube is used for conducting high pressure water injection on the holes, and the water content of the driving coal seam is increased by 1% or more. Dust is removed to the largest extent, so that the dust rate of the driving working face is effectively lowered, and the effect for preventing gas from gushing out on the mining working face is obvious.

The invention discloses a preparation method for electronic-grade high-purity chlorine from industrial liquid chlorine. The electronic-grade high-purity chlorine with purity of more than 99.999% is prepared from industrial liquid chlorine through gasification, multistage physical drying, removal of carbon dioxide through adsorption, compression condensation and rectification for removal of low-boiling-point gas like nitrogen, oxygen, hydrogen, carbon monoxide and methane. The preparation method has the advantages of low cost, high benefits and capacity of preparing a high-purity product; and the product is extensively applicable to preparation of optical fiber communication, microelectronic and high temperature superconducting materials.

The invention discloses a production method of pad cotton of a cover plate of an automobile spare tire. The production method comprises following steps of material weighing; pre-opening; precise opening; even and orderly weighing; material spreading and net forming; drying at a set temperature; cold rolling and shaping; and cutting. In this way, problems of excessive formaldehyde, horizontal and longitudinal tearing and poor stretching performance of pad cotton of a spare tire are solved; dust producing rate of a hair felt is reduced; small of the product is improved; and production environment is improved.

The invention discloses a towered granulating device, comprising a housing which is provided with an electric motor, wherein, an internal rotating shaft and an external rotating shaft which are arranged inside the housing are driven by the electric motor to rotate in opposite directions with the gear wheel transmission way. The reverse direction rotation drives a rotating impeller and a nozzle housing which are arranged at the bottoms of the internal rotating shaft and the external rotating shaft to rotate in opposite directions, thereby ensuring that the solution positioned inside the nozzle housing is thrown out from holes of the nozzle housing and enters a cooling medium in a liquid dropping way; the rotating speed is adjusted simply by replacing speed adjusting gear wheels with different diameters through the design of engagement of the speed adjusting gear wheels, a driven gear wheel of the internal rotating shaft and a driving gear wheel of the internal rotating shaft, thereby being convenient to change the speed; one electric motor is adopted to drive the rotating impeller and the nozzle to rotate in opposite directions, and the gear wheel transmission way is adopted, thereby the energy consumption is reduced; a cross section and a lengthwise section inside the nozzle housing are provided with holes forming certain angles with the nozzle external wall, thereby reducing the dust rate when the solution is thrown out and the particles are made and solving the problem of jet hole blockage.

The invention relates to a method for drying silicon wafer cutting waste by a fluidized bed, and belongs to the technical field of recycling of silicon secondary resources. The method aims at the problems that the moisture content of a filter cake after pressure filtration of the silicon wafer cutting waste is high, and conventional steam drying, microwave drying and other methods are adopted, sothat the drying efficiency is low, the moisture removal is incomplete, and secondary oxidation of the silicon wafer cutting waste and reduction of a recovery rate of the silicon are caused and the like, and the fluidized bed drying treatment of the silicon wafer cutting waste is provided. The fluidized bed drying is carried out in advance before the silicon wafer cutting waste is subjected to high-temperature treatment and recycling, so that the moisture remaining in the filter cake of the silicon wafer cutting waste is efficiently and rapidly removed, and meanwhile, the oxidation of silicon particles in a drying process is inhibited. The moisture content in raw materials is reduced through the fluidized bed drying, so that the drying efficiency is improved, the utilization efficiency of the silicon wafer cutting waste in the subsequent process is improved, and the recovery rate of the silicon is further improved. The dried silicon wafer cutting material can be directly smelted to recover the silicon, or combined with a silicon raw material for refining.

A positive-pressure sealing and rapid cover plate opening embedded scraper transporter comprises a head part, a tail part and an intermediate section, all of which are provided with access doors. The head part is provided with a head sealing mechanism, and the tail part is provided with a tail sealing mechanism. The intermediate section is provided with a sealing and rapid upper cover opening mechanism, and the access doors are provided with sealing and rapid viewing door opening mechanisms. According to the positive-pressure sealing and rapid cover plate opening embedded scraper transporter, through well sealing on the shaft stretching-out end of the embedded scraper transporter, the access doors, an upper cover and other places where dust is possibly generated, environment pollution is reduced; and through the improvement on the access doors and an upper cover locking mechanism, rapid cover opening is convenient, and time is saved.

The invention discloses glass wool powder for large-scale production of glass wool and a production method thereof as well as the glass wool. The glass wool powder comprises the following components in parts by weight: 75-85 parts of waste glass, 5-10 parts of borax pentahydrate, 1-3 parts of sodium carbonate, 1-3 parts of dolomite, 1-3 parts of potash feldspar, 1-2 parts of potassium carbonate, 0.5-1.5 parts of sodium nitrate, 0.3-1 part of table salt and 0.5-1 part of sodium sulfate. The glass wool powder and the production method thereof as well as the glass wool disclosed by the invention have the benefits that the production cost is low, resources are comprehensively utilized, and the environmental protection is facilitated; as the waste glass is used as a main raw material, the cost is low, so that the price of the glass wool is greatly reduced, the product competitiveness is improved, and meanwhile a large quantity of waste glass is treated, therefore, the environmental protection is facilitated; the compression resilience ratio of the glass wool is more than or equal to 96.1 percent; the average fiber diameter of the glass wool is 3.5 [mu]m; the moisture content is less than or equal to 0.3 percent; a thermal conductive coefficient is less than or equal to 0.032 W/(m.K); the mass loss rate is less than or equal to 4.8 percent, the raised temperature in a furnace is less than or equal to 3 DEG C, and the continuous flame time is 0 second.

The invention relates to a dust-fall method for coal mining, in particular to a dust-fall method for a coal body in an extra-thick fully-mechanized caving face through high-pressure water injection. By adoption of the dust-fall method, the problem of lacking a method for controlling dust concentration in the process of mining the coal body in the extra-thick fully-mechanized caving face is solved. According to the scheme, the dust-fall method comprises the following steps that a, after a stope working face is circled, water injection holes are drilled in an inlet air forward groove and a return air forward groove of the stope working face, and included angles between the water injection holes and the forward grooves are 90 degree; b, the water injection holes are sealed through hole packers; and c, water is injected into the water injection holes through a water injection pump. The dust-fall method for the coal body in the extra-thick fully-mechanized caving face through high-pressure water injection has the advantages that (1) through water injection of the coal body in the extra-thick fully-mechanized caving face, dust production is eliminated from the source to the maximum extent, and thus the dust rate of the stope working face is effectively reduced; (2) through water injection of the coal body in the extra-thick fully-mechanized caving face, the temperature of the coal body in the stope range is effectively decreased and the spontaneous combustion control effect is obvious; and (3) the drilled water injection holes are arranged and designed reasonably, operation is easy, construction is convenient, and the dust-fall effect is remarkable.

The invention discloses an open air water hole float-and-sink sounding type detonating method and belongs to the technical field of detonation. A double-layered pipe is spirally connected to a detonating sink plate, the detonating sink plate is transferred down to a water surface in a water hole to measure depth of an air layer, then a balance weight material is injected into the double-layered pipe, the detonating sink plate gained in weight sinks continuously to the surface of sludge in the water hole to measure the depth of the water layer, the balance weight material is continuously injected into the double-layered pipe till the detonating sink plate sinks downwards to the bottom of the water hole to measure the depth of a sludge layer, explosive components are prepared reasonably according to depths of the air layer, the water layer and the sludge layer, then water is injected into the double-layered pipe, so that the detonating sink plate is separated, the lower half part of the detonating sink plate is left in the sludge layer and the upper half part floats to the water surface, the upper half part is filled with macadams to a hole opening with a plugging material, detonation is reserved in the lower half part to adjust measures to local conditions, and explosive bags are distributed and mounted while sounding is achieved, and therefore, the detonating efficiency and effect can be improved remarkably.

The invention discloses an intelligent dust fall control method and system for a construction site, and the method comprises the steps: 1, inputting local meteorological information and the engineering information of the current construction site into a control structure, and building an on-site dust model of the current engineering according to a data analysis structure; 2, the content of particulate matter in actual air of the construction site and other air information are measured according to an on-site gas detection system; step 3, determining a threshold interval of the content of particulate matters in the field air according to a field construction standard; 4, the output power and the working mode of the dust falling structure are determined according to the maximum difference value and the minimum difference value of the field dust model and the threshold value, the dust content, the humidity and the wind speed in air can be detected through the internal structure of the dust falling structure, detection values are output to a control device, and the control device controls a spraying assembly to conduct dust falling according to the detection values. The dust raising condition of the construction site can be monitored, the dust raising rate of the construction site is reduced through the spraying assembly, and the urban environment is protected.

The invention relates to a stone etching solution and a preparation method thereof, and belongs to the technical field of stone processing. The preparation method comprises the following steps modifying corncobs through a pre-emulsification technology in emulsion polymerization to prepare alkali-treated corncob powder grafted acrylate emulsion; then compounding the alkali-treated corncob powder grafted acrylate emulsion with a corrosion solution; diluting with water to prepare the stone etching solution. According to the stone etching solution and the preparation method thereof, etched surfaces of stones are rapidly wetted, small-particle dust covers the stones while the stones are corroded and softened, and films are formed on the surfaces of the stones so as to effectively prevent the small-particle dust in subsequent treatment from flying off, reduce the dust rising rate and reduce damages, caused by the dust in a stone etching process, to workers; the stone etching solution and thepreparation method thereof have the advantages of high working efficiency, simple technology, labor saving and time saving, and raw material saving and have a wide application prospect.