170 results about "Pre extraction" patented technology

A process of treating a lignocellulosic material includes a pre-extraction step in which hemicellulose is extracted from the lignocellulosic material. Then, in a solvent pulping step, the lignocellulosic material is separated into pulp by contacting the lignocellulosic material with a cooking liquor comprising a solvent. In one embodiment, the solvent has a boiling point of at least about 150° C. In another embodiment, the cooking liquor comprises a mixture of solvent and water.

The invention relates to a drilling-explosion-pumping triadic gas extraction method, which is most suitable for regional gas extraction of a high gas and low permeability coal seam. The method comprises the following steps: alternately arranging hole positions of drainage holes and blast holes of an along bed or a cross seam on a coal seam in front of a coal mining or tunneling working surface; and performing construction work on the drainage holes one by one, and performing blasting operation, wherein through the edgetone effect of denotation gas in the blast holes, a columnar compression crushing circle and a crack body which passes through and blasts in the direction of a line of centers of the blast holes and the extraction holes are generated on the periphery of a blasting hole to transfer the ground stress, improve the gas permeability of a coal body, relieve the pressure in a coal body and facilitate for drainage of gas in the coal body. The gas permeability of the coal body can be improve by around 20 to 50 times, the gas extraction quantity of haplopore can be increased by 5 to 10 times averagely, the gas extraction concentration is more than or equal to 50 percent, and the gas extraction rate of a robbing working surface is more than or equal to 80 percent. After pressure releasing and permeability improving of drilling, explosion and pumping, the gas pre-extraction time can be shortened by half, and the number of drilling holes of gas extraction is decreased by 20 to 30 percent; and the method achieves safe, high-efficiency and uniform extraction of the gas in the high gas and low permeability outburst coal seam.

The invention mixes and pre-extracts the mixed solution of acidic organic extractants such as P507, P204, C272, and naphthenic acid with magnesium bicarbonate and / or calcium bicarbonate solution and rare-earth solution. The rare-earth ions are extracted into the organic phase, then the loaded organic phase containing rare-earth ions are obtained through clarification, and can be used for the extract separation of the mixed rare-earth feed liquid. After a plurality of different levels of extraction, washing, stripping, single rare-earth compounds or rare-earth elements-containing enrichments can be obtained. The magnesium bicarbonate and/or calcium bicarbonate solution are prepared by roasting, digesting, carbonizing magnesite, limestone, calcite, dolomite and similar minerals, so that the content of impurities, such as silicon, iron, aluminum is lower. Ternary phase sediment is not produced in the pre-extraction and extraction separation process, so that the purity of the rare-earth products are not affected. The organic phase does not need ammonia saponification and does not produce ammonia-nitrogen wastewater. By adopting the invention, the production cost of rare-earth products is greatly lowered and the cost for three waste disposal is also greatly saved.

The present invention relates to a “drilling-flushing-slotting” coupled pressure relief and permeability increasing method for a high gas outburst coal seam, which is more particularly suitable for the pressure relief and permeability increasing when gas of a roadway band of the high gas outburst coal seam is pre-extracted through crossing boreholes. On the basis of the crossing borehole pre-extraction measures for the coal seam gas, the hydraulic flushing and the hydraulic slotting are reasonably combined, and a “drilling-flushing-slotting” dedicated device is utilized to implement the coupled operation of “low pressure drilling-medium pressure flushing-high pressure slotting” in a borehole, so that the coal in the pre-extraction area is deformed and moved to form network cracks, passages are provided to the desorption flow of the gas, and the gas is easier to extract. The method can enlarge the single-hole pressure relief influence range, increase the gas permeability of the coal seam, improve the gas extraction efficiency, reduce the number of pre-extraction boreholes, shorten the pre-extraction time and have good applicability to the coal seams in different occurrence states. The present invention can reduce the number of the crossing boreholes by 32.5% and can reduce the length of each crossing borehole by 42.9%, is remarkable in coal roadway regional outburst eliminating effect, and obviously increases the tunneling speed.

The invention provides a slotting and fracturing cooperation networking permeability increasing method for a low-permeability coal seam, which is applicable to regional gas control for high-gas-content low-permeability coal seams. The permeability increasing method comprises the following steps that: firstly, hole positions of slotting drill holes and fracturing drill holes are arranged alternately at a floor suction roadway in a networking arrangement mode; each slotting drill hole is subjected to high-pressure water jet flow slotting to form an annular slotted hole; and then, each fracturing drill hole is subjected to segmented fracturing, and a fracture net is formed in the coal seam. The slotting drill holes and the fracturing drill holes are in cooperative arrangement; the slotted holes formed by slotting are used for controlling the expanding direction of fracturing cracks; the number of cracks in the coal seam can be effectively increased through segmented fracturing multiple times; and good conditions are created for the drill hole gas extraction and the gas flowing in the coal seam. After the fracturing cracks are communicated with the slotted holes, a crack network is formed in the coal seam; the permeability coefficient of a coal body around the drill holes can be improved by 150 to 400 times; the single-drill-hole gas extraction effective influence range can be expanded by 2 to 4 times; the drill hole gas extraction quantity can be increased by 3 to 6 times; and the gas pre-extraction time in the high-gas outburst coal seam can be effectively shortened.

This is a gas extraction method for a single burst coal bed of stable coal occurrence, angle less than 10o, and firm index over 0.5. Drill a hole from top working face downward along the coal bed from shallow bed to deep, from low gas concentration zone to high for pre-extraction to lower down the gas concentration.

The invention relates to an underground progressive gas pre-extraction and directional hole drilling system and method for a broken and soft coal seam. An orifice bubble filling system is utilized to provide a continuous bubble flow for a drill hole to drive hole bottom grooving air screw motor to perform rapid drilling, and scouring to the hole wall of the broken and soft coal seam is reduced. A triquetrum auger stem is used for strengthening residue discharge. An orifice bubble-eliminating extraction system is utilized to eliminate bubbles, remove rock cuttings and perform gas extraction, and construction safety is guaranteed. A dual-drive compound directional drilling technology is combined to regulate and control a drilling trajectory and ensure that the drill hole extends along the designed trajectory and penetrates through and covers an unmined working face and a roadway to be excavated. The hole forming depth, the hole forming precision, hole forming efficiency and hole forming rate of the broken and soft coal seam with the Platts hardness coefficient f greater than or equal to 0.5 but smaller than or equal to 0.8 are wholly improved, the formed hole is used for progressive gas pre-extraction in a broken and soft coal seam zone, and a standard-reaching period of the working face of the broken and soft coal seam and coal roadway driving gas extraction is shortened.

The invention belongs to the field of image processing and computer vision, and relates to an unmanned aerial vehicle infrared and visible light image fusion method based on target pre-extraction. Themethod comprises the following steps of Registering the infrared image and the visible light image of the unmanned aerial vehicle by adopting a registration algorithm based on image gradient mutual information; Carrying out target pre-extraction on the infrared image and the visible light image after registration by adopting a target pre-extraction algorithm based on frequency spectrum residue; And carrying out image fusion on pre-extracted areas of the infrared image and the visible light image after registration by adopting an area blocking fusion algorithm. According to the method, the problem that the infrared image and the visible light image cannot be fused due to different visual angles or visual fields is effectively solved, the whole image is prevented from participating in the fusion operation, and the algorithm calculation amount is reduced; On the premise that decomposition transformation is not carried out on the image, the target pre-extraction region is uniformly segmented, the mode of calculating the fusion weight of each segmented sub-region based on the significance of the pre-extraction region is more scientific, and the fusion result is more authentic.

The invention discloses a pre-extraction method for an organic extraction agent, a product and an application thereof in the extraction and separation of rare earths. The pre-extraction method comprises the following steps that: the organic extraction agent is directly mixed with a rare earth solution and alkaline-earth metal compound powder or water slurry containing magnesium and/or calcium forpre-extraction, rare earth metal ions in an aqueous phase are extracted into an organic phase, exchanged nascent hydrogen ions dissolve an alkaline-earth metal compound to maintain the acidity balance of an extraction system so as to produce a loaded organic extraction agent which contains the rare earth metal ions and is used for nonsaponifiable extraction and separation of rare earth elements. In the extraction method, the organic extraction agent does not need liquid ammonia and liquid alkali to saponify, no ammonia nitrogen waste water is produced during the extraction and separation process of the rare earths, the separation cost for the rare earths is greatly reduced, and a large amount of cost for three-waste treatment is saved. The method is suitable for the extraction and separation of the rare earths in all hydrochloric acid systems, sulphuric acid systems and nitric acid systems, has small investment, and takes effect quickly.

The embodiment of the invention provides an access method and device for CC-NUMA (cache coherent-non uniform memory access) system. The method comprises the following steps that a node controller (NC) records an IO (input/output) history record, wherein the IO history record means the history statistic record of propelled IO data of a cache (CA) from an IOH (input/output hub) to at least one CPU (central processing unit) through the NC aiming to at least one designated address; when the NC determines that the IO history record meets the preset condition, the NC sends a pre-extraction prompting message to the CA of the remote CPU, and the pre-extraction prompting message is used for initiating pre-fetch access of the IO data by the CA of the remote CPU aiming at the address in the pre-extraction prompting message. By adopting such a technical scheme, through analyzing whether the history record meets the preset condition, the IO data prompting message aiming at the designated address is actively sent to the CA of the remote CPU, and moreover, the remote CPU initiates an IO data pre-fetch operation aiming at the designed address in advance, thus, the access delay of the remote IO data is shortened, and the performance of the system is improved.

The invention discloses gas extraction equipment and a gas extraction method for a low coal penetration layer. The gas extraction equipment for the low coal penetration layer comprises a hollow drill rod, wherein the tail end of the drill rod is connected with a high-pressure water pump through a pipeline; the high-pressure pump is communicated with a water tank; nozzles are arranged at intervalson the rod body of the drill rod; and a vibrator is arranged in the drill rod. The gas extraction method for the low coal penetration layer comprises the following steps of: arranging the gas extraction equipment for the low coal penetration layer, inserting the drill rod into a drill hole, determining whether to start the vibrator or not according to the structure of a coal body, starting the vibrator for vibrating a coal layer if the coal body is a soft coal layer, feeding high-pressure water to the drill rod by using the high-pressure water pump and spraying the high-pressure water to the coal layer through the nozzles; and if the coal body is a hard coal layer, starting the high-pressure water pump for feeding water into the drill rod and spraying the water onto the coal layer throughthe nozzles of the drill rod or vibrating during water jetting. Specific to the problems of poor air permeability and the like of a coal reservoir in a gas pre-extraction process, in the gas extraction equipment and the gas extraction method for the low coal penetration layer, the stress of the coal reservoir is released effectively.

The invention discloses a method for improving crossing-hole gas extraction concentration, which is particularly applied to crossing-hole later-stage pre-extraction coal bed gas in a hole cluster mode. When the gas extraction concentration is lower than 30 percent, a plurality of small peripheral holes are formed around the crossing-hole cluster, and at least one inner small hole is formed insidethe hole cluster; powder conveying pipes are arranged inside the small peripheral holes and the inner small hole and hole openings are sealed by a polyurethane sealant; and fine powder is respectively blown into the small peripheral holes and the inner small hole through the powder conveying pipes due to an underground air pressure system, and the fine powder enters fracture air leakage channels around crossing holes and blocks channels through which airflows enters the crossing holes in a tunnel under the coaction of positive pressure of the underground air pressure system and negative pressure of extracting the gas. The method for improving the crossing-hole gas extraction concentration has the advantages of capacity of greatly improving the crossing-hole gas extraction concentration, prolonging the drilling hole effective extraction period, along with simple, convenient and rapid operation.

The invention relates to a method for improving the conversion efficiency of lignocellulose through combined treatment and a method for efficiently preparing ethyl alcohol. The method for improving the conversion efficiency of the lignocellulose through combined treatment includes the steps that a lignocellulose raw material is pre-extracted through alkaline, then alkaline H2O2 treatment is conducted, and afterwards, enzyme hydrolysis is carried out. According to the treatment method, alkaline pre-extraction is carried out first, and then alkaline H2O2 treatment is conducted, so that the enzymolysis conversin rate of the lignocellulose is greatly increased, and the glucose conversion rate of the cellulose can be urged to be further increased. The pretreatment process is simple and easy to implement, and wastewater which is difficult to deal with can be avoided. The using amount of H2O2 in traditional alkaline hydrogen peroxide pretreatment is reduced, and meanwhile the H2O2 can be made to act on remaining lignin more effectively.

The invention relates to a bagasse alkaline pulping method by pre-extracting hemicellulose and a product thereof; the method includes the following steps of: preparing bagasse: depithing and washing the bagasse; pre-extraction, in which the extracted solvent is sodium hydroxide solution and the technical condition comprises an alkaline content of 1-8percent, a solid-to-liquid ratio of 1:2.5-8.0, extraction temperature of 80-180 DEG C, heating-up time of 10-120 minutes, holding time of 0-120 minutes, a pH value of 4.5-6.9 at a reaction end point, and the pressure of saturated steam pressure at corresponding temperature; liquid solid separation and washing: collecting filtrate to produce extract; and preparing the pulp by residue alkaline process. In the invention, bagasse extract capable of extracting xyio-oligosacchandes, and the like and bagasse rough pulp for preparing whitened chemical pulp can be obtained; with a pre-extraction procedure added before stewing, the unscreened yield and hardness of bagasse are equivalent to that of pure pulping without pre-extraction by controlling the pre-extraction and stewing technical condition; bagasse biological refining on a pulping basis is realized; and the cost for pulping and pre-extracting hemicellulose is reduced, thereby saving resources.

The invention discloses a method for comprehensively processing a molybdenum-nickel ore which needs to solve the technical problem of achieving the high extraction rate of molybdenum, nickel, zinc, copper and lead as well as comprehensively utilizing the valuable component of a carbon molybdenum-nickel ore. The invention includes the following steps: grinding a raw ore material to 100 to 400 meshes; pre-extraction, terminal-extraction, the processing of the slag of terminal-extraction and the separation of a pre-extraction liquid. Compared with the prior art, the invention has a high comprehensive recycling rate; the molybdenum-nickel achieves 99 percent; the other nonferrous metals achieve 96 percents. Besides, the method of the invention avoids the valuable component from being lost during the next separation process; the pre-extraction liquid is closed and circulated during the technique; the waste water drain is removed; the demand of the technique to a device is low; the used chemical materials are cheap; the technical condition is gentle; the cost is low; the hidden safety danger brought by the traditional high temperature and high pressure operation is removed; the production process is easy to realize mechanization.

The invention relates to a liquid carbon dioxide bomb and a propping agent blasting anti-reflection method and a device. The device comprises a liquid storage tube provided with a priming device and liquid carbon dioxide. A releasing tube with propping agent inside is arranged in the front part of the liquid storage tube. A plurality of spray-holes are disposed on the tube wall of the releasing tube. The propping agent is wrapped in a thin strip-shape with plastic film and put into the releasing tube. High-pressure gases produced by vaporized liquid CO2 after liquid CO2 bomb detonates in coal seam form a large number of fractures in drill holes. The high-pressure gas destroys the plastic film wrapping the propping agent during an explosion process. The propping agent with the high-pressure gases enters into coal seam fractures and fractures formed by propping, prolongs existing time of the fractures. The fractures have big presplit radius in coal seam, which can effectively reduce drilling hole amounts in a current extraction and exploitation system in underground coal mines, improve extraction efficiency, reduce pre-extraction time of gas and extraction cost of gas in coal mine, improve a production efficiency of coal, and enhance security of coal production.

The invention discloses a method for bedding drilling and working surface gas pre-extraction. According to the extraction time difference and the difference in distances to the cut openings, downward bedding drilled holes with different hole distances are parallelly constructed along the tendency of a coal seam respectively in working surface air returning following grooves, upward bedding drilled holes with different hole distances are parallelly constructed along the tendency of the coal seam in working surface conveying following grooves, gas extraction pipelines are respectively arranged on the sides of the conveying following grooves and the air returning following grooves close to a working surface coal wall, the downward bedding drilled holes and the upward bedding drilled holes of the conveying following grooves and the air returning following grooves enter a mine gas extraction system through the gas extraction pipelines, and after grouting and hole sealing, the extraction system is in combination to perform gas extraction. According to the technical scheme, by adjusting a drilling arrangement mode, the bedding drilled holes with different hole bottom distances are constructed according to the extraction time difference and the difference in distances to the cut openings, the drilling engineering quantity is reduced, production time of the working surface is shortened to the largest extent, the gas extraction effect is improved, and coal and gas simultaneous extraction is achieved.

The invention relates to the field of image processing, and specifically relates to a UAV (unmanned aerial vehicle) reconnaissance video image object automatic detection method. The method comprises the steps: employing a target coarse extraction algorithm and a fine extraction algorithm for pre-extraction of a target region, carrying out the judgment of the pre-extracted region through a classifier, eliminating a non-target pre-extracted region, maintaining and marking the target region, and achieving the automatic detection of a target in the video image. According to the invention, a pre-extraction algorithm is introduced for the pre-extraction of the target in the video image, thereby avoiding a condition that a detection algorithm causes the detection leakage or wrong detection because the size of a sliding window and the step length cannot achieve the stepless changes or the features of the target are not apparent, and improving the detection accuracy. Meanwhile, the invention introduces the pre-extraction algorithm for the pre-extraction of the target in the video image, thereby achieving the sharing of the weight of a classifier detection algorithm in the whole automatic detection process of a reconnaissance target, reducing the requirements for the number of samples required by the training of the classifier and the order of magnitudes of diversity, and improving the operation efficiency.

The invention relates to a production process for comprehensively recovering valuable metal of copper, cobalt and iron alloy, belonging to the technical field of hydrometallurgy and comprising the steps of: preparing fine alloy powder with the mesh of -100 by vibrating, grinding, screening and grading the copper, cobalt and iron alloy; adding water to the fine alloy powder to stir; then adding a required theoretical quantity of fluorine ions F-; adding inorganic acid to react for 1.5 hours; slowly adding oxidant solution; stirring for 1.5 hours at the continuous temperature of larger than 85 DEG C after adding the oxidant solution; separating solid from the solution; adding a reducer whose use quantity is 1.05 times of the theoretical quantity to the obtained filtrate; stirring at normal temperature; reacting for 2 hours; obtaining cuprous chloride and pre-extraction solution after filtering; and finally carrying out P204 extraction and P507 extraction on the pre-extraction solution; and evaporating and crystallizing to obtain cobalt chloride. The production process has the advantages of environmental-friendly performance, simple operation, high efficiency, energy saving and suitability for industrial production.