646results about "Sedimentation separation" patented technology

The invention relates to the technical field of coal washing equipment, in particular to a lifting type peripheral transmission rake thickener operation system for coal washing, which comprises a working condition sensing module used for collecting slime water concentration, rake frame torque, slag layer thickness and equipment operation temperature data; the intelligent decision-making module is used for constructing a slime water sedimentation prediction model through an LSTM-GRU hybrid algorithm according to the data, and generating an equipment operation regulation and control instruction; the lifting transmission regulation and control module is used for adjusting the vertical height of a rake frame according to a regulation and control instruction to adapt to different slag layer thickness treatment requirements, and meanwhile, combining real-time feedback of the torque of the rake frame, dynamically adjusting the rotating speed of a peripheral transmission motor and optimizing coal slime and water separation conditions; and the safety early warning module is used for monitoring parameter mutation through a sliding window algorithm, and triggering corresponding strategies of different levels when the harrow torque and the slime water concentration exceed multiple groups of adaptability thresholds. Therefore, the problems that in the prior art, the height of the rake frame is fixed, regulation and control depend on manpower, and an early warning mechanism is extensive are solved.

A device and method for assembling objects by generating an axial acoustic radiation force in order to position the objects on pressure nodes and / or antinodes and generating a transverse acoustic radiation force in order to move the thus positioned objects on a porous membrane contact structure.

The utility model relates to a safe operation protection system of a non-metal mud scraper and a mud scraping system. The safe operation protection system of the non-metal mud scraper comprises a scraper detection device, a tension early warning device and an electrical control system, the scraper blade detection device comprises at least one group of scraper blade detection devices, each group of scraper blade detection devices comprises two scraper blade detection devices which are oppositely arranged, each scraper blade detection device is connected with the electrical control system, and the scraper blade detection devices are used for being in contact with the two side ends of a scraper blade; the tensioning force early warning device comprises two opposite tensioning force early warning devices, each tensioning force early warning device is connected with the electric appliance control system, and the tensioning force early warning devices are used for making contact with the first chain wheel. The system can timely identify the faults such as asynchronous deviation and chain breakage of the two sides of the scraper.

The invention belongs to the technical field of chemical fertilizer production and livestock feed, and particularly relates to a combined preparation method of water-soluble potassium sulfate and feed-grade potash magnesium sulphate fertilizer. According to the method, the picromerite concentrate wet material is taken as an initial raw material, the picromerite concentrate wet material with relatively low potassium and magnesium content is purified into high-grade potassium sulfate and the potash magnesium sulphate fertilizer by utilizing hot melt mother liquor at different mother liquor points through multi-stage hot melt and multi-stage vacuum evaporative crystallization, so that efficient distribution and conversion of potassium and magnesium elements in the raw material are realized, resource waste is avoided, and the production cost is reduced. The comprehensive utilization rate of raw materials is greatly improved. Two high-added-value products, namely the water-soluble potassium sulfate and the feed-grade potassium-magnesium fertilizer, are prepared at the same time, and the blank of combined preparation of raw materials required by agriculture and animal husbandry is filled.

A system for softening high-salinity water via self-induced calcium bicarbonate crystallization in a fluidized bed, including a fluidized bed-based crystallization-softening reaction unit, a water feeding unit, a dosing unit and a regulation unit. The fluidized bed-based crystallization-softening reaction unit is configured to induce a crystallization reaction to soften high-salinity water. The water feeding unit is configured to supply high-salinity water to the fluidized bed-based crystallization-softening reaction unit. The dosing unit is configured to supply a pH regulating agent to the fluidized bed-based crystallization-softening reaction unit. The regulation unit is configured to perform reflux replenishment for the fluidized bed-based crystallization-softening reaction unit and recover escaping crystals. A high-salinity water softening method using such system is also provided.

The invention relates to the technical field of ardealite treatment technology, and discloses a method and a system for harmless treatment of ardealite, which are characterized in that fresh ardealite discharged by wet-process phosphoric acid filtration is re-pulped and then sequentially passes through a first-section reaction tank (added with fly ash and cement), a tank A of a second-section reaction tank, a tank B of the second-section reaction tank and a tank C of the second-section reaction tank for continuous reaction; performing solid-liquid separation to obtain harmless phosphogypsum; after the filtrate is settled, supernate is reused for repulping and lime milk preparation, and thick slurry is returned to the reaction tank; the reaction waste gas is washed with phosphoric acid acidic water, and washing liquid is reused for ore grinding; through multi-stage reaction and accurate pH control, the phosphogypsum stably reaches the class I solid waste standard, and the curing time is shortened from traditional several days to several hours; the system is deeply coupled with a front-end phosphoric acid system, and water balance and resource circulation of the system are realized by optimizing and filtering a washing water source and recycling steam condensate water; the process has the advantages of low cost, stable quality and flexible operation.

The invention relates to a method for intelligently predicting and optimally controlling the running state of an oilfield sewage settling tank, which comprises the following steps of: acquiring time sequence data by using a modular design reconfigurable settling system fused with multi-modal perception; combining a physical information neural network (PINN) algorithm to construct a mapping relation of working characteristics between an actual settling tank and an experimental settling tank: predicting the performance of the actual settling tank through data of the experimental settling tank; identifying and predicting the operation state of the experimental settling tank, and establishing a multi-parameter fuzzy comprehensive evaluation model; intelligent decision making and automatic control are carried out on the settlement system; a Markov decision process MDP is adopted as an optimization framework of a control decision, and the control decision is optimized in combination with a migration enhanced PPO algorithm, so that automatic adjustment of system performance is realized; and continuous self-optimization for the MDP decision process of the Markov decision process is realized. The problem that the operation state of the settling tank is difficult to monitor in real time and dynamically regulate and control in the traditional oilfield sewage treatment process is solved.

The invention relates to the field of plant extracts and daily chemicals, in particular to preparation and application of a penthorum chinense pursh leaf and stem extract with acne removing and oxidation resisting effects. The preparation method of the extract comprises the following steps: taking a penthorum chinense leaf and stem dry product, carrying out heating extraction or ultrasonic crushing extraction by taking water as a solvent, carrying out purification and impurity removal or filtration and impurity removal by using a chitosan quaternary ammonium salt-sodium alginate combined biological flocculation method, taking supernate, carrying out vacuum concentration, and carrying out spray drying, so as to obtain the penthorum chinense leaf and stem extract. The content of the quercitrin in the index component is more than or equal to 16mg / g. The effect of the invention is extracted from the characteristic medicinal and edible plant penthorum chinense pursh in China, is high in safety, has obvious acne-removing and anti-oxidation effects, and is a novel functional cosmetic plant raw material with excellent application prospect.

The invention discloses an enhanced separation device and method for washing, solid removal and defoaming of a coal liquefaction system. The enhanced separation device comprises a vertical tank body, and a gas outlet and a solid-liquid outlet are formed in the top end and the bottom end of the vertical tank body respectively; a momentum fin unit, a micro-washing spraying device, an inlet separation distributor and a hydraulic spray head are sequentially arranged in the vertical tank body from top to bottom, and a material inlet is formed in the position, corresponding to the inlet separation distributor, of the side wall of the vertical tank body; the momentum fin unit and the micro-washing spraying device are positioned above the inlet separation distributor; the hydraulic spray head is obliquely upwards arranged on the inner wall below the inlet separation distributor; and the solid-liquid outlet is connected with a circulating pump through a pipeline. The device is compact in structure, the separation process is simplified, fine particles are trapped and separated only through gravity settling, the inertia effect and the like, and efficient and stable operation of the system is facilitated.

A hydrometallurgical process for recovering a plurality of metals from a complex rare and precious material, comprising the following steps: step 1: adding a complex rare and precious material to a hydrochloric acid solution, adding an oxidant for reaction, and then performing filtration to obtain a chlorination liquid and a chlorination residue; step 2: using two-stage counter-current gold loading to obtain a gold-loaded liquid and a post-loading liquid, reducing the gold-loaded liquid, performing clarification to obtain an organic phase, and filtering a precipitate to separate a post-reduction liquid and sponge gold; performing evaporation and concentration on the post-reduction liquid to produce a concentrate 1 and a condensate; and cooling and crystallizing the concentrate, performing filtration to obtain residual oxalic acid, and returning the residual oxalic acid to the reduction process and a post-crystallization liquid to gold loading; step 3: performing low-temperature distillation on the post-loading liquid to obtain a concentrate 2; step 4: performing high-temperature distillation on the concentrate 2 to obtain a concentrate 3; step 5: performing directional crystallization and centrifugal filtration on the concentrate 3 to obtain a crystallization residue and selenous acid; and step 6: washing the crystallization residue by using cold water or a low-acid-level condensate produced in step 3, and performing filtration to obtain a tellurium residue and a palladium-platinum-rhodium-rich liquid.

The utility model discloses a sludge scraper for a sewage treatment tank, which belongs to the technical field of sludge scrapers and comprises a sewage tank, a mounting frame is arranged at the top of the sewage tank, after the mounting frame is mounted on the sewage tank in a limited manner, a motor works, a connecting frame and a scraper plate are driven by a moving mechanism to move together, and the scraper plate is driven by a motor to move. The connecting frame located on the front portion of the scraper plate can drive the gear in the connecting frame to move when moving, the gear rotates through meshing connection formed by the gear and the rack, and therefore the gear drives the driving wheel to rotate, the driving wheel drives the driven wheel to rotate through the belt, and the brush cylinder can rotate while the connecting frame drives the brush cylinder to move. The friction force between the brush cylinder and the inner wall of the sewage pool is increased, and the scraper plate at the rear part of the brush cylinder is matched, so that relatively stubborn sludge attached to the inner wall of the sewage pool can be effectively and quickly scraped, the working efficiency is improved, and the use is convenient.

The utility model discloses a recycling device of stevioside mother liquor, and relates to the field of stevioside production, an outlet of a crude product powder tank is communicated with a dissolving tank, an outlet of the dissolving tank is communicated with a first crystallizing tank, an outlet of the first crystallizing tank is communicated with a first separator, and the first separator is communicated with a first crystal tank and a first crystallizing mother liquor tank; an outlet of the first crystallization mother liquor tank is communicated with a second crystallization tank through a pipeline, an inlet of the second crystallization tank is communicated to the crude product powder tank, an outlet of the second crystallization tank is communicated with a second separator through a pipeline, a solid phase outlet of the second separator is communicated with a second dryer, and an outlet of the second dryer is communicated with a second crystal tank; and a liquid phase outlet of the second separator is communicated with a second crystallization mother liquor tank. The primary crystallization mother liquor is used as a solvent to dissolve a new material and then is subjected to secondary crystallization, so that the solvent and solvent recovery energy consumption are saved, meanwhile, the product yield is improved, the additional value of mother liquor sugar is increased, the cost is low, and the method is suitable for industrial production.

The utility model belongs to the technical field of sewage treatment, and relates to a circulating sedimentation device for sewage treatment, which comprises a tank body, a stirring device, a feeding chamber and a backflow device, the tank body is divided into a coagulation tank, a flocculation tank and a sedimentation tank, the coagulation tank is provided with a water inlet pipe and is communicated with the flocculation tank through a water outlet at the bottom of a partition plate; the flocculation basin is communicated with the sedimentation basin through an overflow port in the top of the clapboard; the stirring device comprises a motor, a stirring shaft and blades and extends into the coagulating basin and the flocculation basin; the feeding chamber is divided into two chambers which respectively correspond to the coagulating basin and the flocculating basin, and a flocculating agent feeding box, a sludge separator and a coagulant aid feeding box are arranged in the feeding chamber; the reflux device is connected with a sludge discharge port at the bottom of the sedimentation tank and the feeding chamber, comprises a reflux pump and a reflux pipe and realizes sludge recycling; the stirring devices and the turbulent flow columns are additionally arranged in the coagulating basin and the sedimentation basin, so that the phenomenon that the flow speed of sewage is too high or too low in the flowing process is avoided, the phenomenon of short flow of the sewage in the treatment stage is avoided, and the treatment efficiency of sewage treatment is improved.

The utility model relates to a novel thickener bottom stirring device. A conical bottom cavity is formed below the bottom of a thickener, an upper stirring shaft is rotationally connected with the bottom face of the thickener through a stuffing box, the stuffing box is provided with a matched stuffing gland, the space between the stuffing box and the upper stirring shaft is filled with stuffing, and a stirring impeller is arranged at the end, on the inner side of the thickener, of the upper stirring shaft. The transmission mode between the upper stirring shaft and the output shaft of the speed reducer all-in-one machine is chain transmission, so that the two shafts are not in the same vertical direction, and the speed reducer all-in-one machine is prevented from receiving a medium leaked from a stuffing box; the second protection plate is arranged on the upper stirring shaft, the edge of the second protection plate is located on the outer side of the first protection plate, the first protection plate is arranged on the bottom face of the cone bottom cavity, a closed pattern is formed on the bottom face of the cone bottom cavity, and leaked media are sealed to the area, deviating from the stirring shaft, of the bottom of the cone bottom cavity. The overflow port is formed in the outer side of the first protection plate of the cone bottom cavity, is lower than the top end of the first protection plate and is used for discharging leaked media.

Disclosed herein are methods, devices, and systems for effectively separating carbonate gangue from bastnaesite without sacrificing significant REO grade or recovery. In some embodiments, centrifugal concentrators may beneficiate Ultra-Fine (UF) bastnaesite and calcite bearing flotation concentrates. The disclosed methods, devices, and systems can achieve initial gravity REO recoveries exceeding 90% while rejecting on the order of 25% to 35% of the total calcium from an assortment of rougher and cleaner flotation concentrates. Addition of stages of cleaner UF Falcon gravity separation may be operated in an open circuit configuration, from an original fine feed of 35 microns containing 50.5% REO and 5.5% Ca, to upgrade up to approximately 59% REO and 2.0% calcium. The disclosed methods, devices, and systems may comprise UF gravity concentration that may provide for recovery of rare earth oxides at levels of greater than 70%, 80% and 90%, while also rejecting more than 15%, 20%, 25%, 30, or 35% of the total calcium. Also described are benefication of fine feed of 35 microns containing 50.5% REO and 5.5% Ca, to approximately 59% REO and 2.0% calcium. In some embodiments, the disclosed methods, compounds, and systems may be used to complement existing or modified flotation systems.

The present invention relates mainly to a method for producing a plastic material, the method comprising the steps of: (i) providing a corn gluten source and a first liquid phase comprising an organic solvent; (ii) extracting solvent-soluble components of the corn gluten source into the first liquid phase; (iii) precipitating a first portion of the solvent-soluble components from the first liquid phase, resulting in a second solid phase comprising the first portion of the solvent-soluble components and a second liquid phase comprising a second portion of the solvent-soluble components; (iv) separating the second solid phase and the second liquid phase, and (v) recovering a flexible plastic material from the second liquid phase or a hard plastic material from the second solid phase.

A novel process for desulfurizing spodumene smelting slag using EDTA is presented. This process uses the final solid waste obtained from the water leaching lithium extraction process after sulfuric acid roasting of spodumene as raw material. A prepared EDTA solution is added to the smelting slag containing approximately 10% calcium sulfate, allowing the raw material to fully react with the EDTA solution, thus achieving desulfurization of the smelting slag. Finally, the filtrate is subjected to rotary evaporation precipitation, and the EDTA solution is recovered and recycled. This process has high resource utilization, not only achieving 99.9% desulfurization of the smelting slag in a short time but also enabling the recycling of the EDTA solution. The desulfurization method provided by this process is highly efficient, simple, and transforms waste into valuable resources, increasing economic benefits. Furthermore, it effectively addresses the environmental compatibility issues of solid waste in the existing lithium mining industry, which is of great significance for the sustainable and high-quality development of the lithium battery industry.

A system and method for flotation of particles. The system includes a flotation tank, a bubble generator and an acoustic generator. The floatation tank includes a substance inlet to supply a substance including particles to the flotation tank and a substance outlet to allow the substance to exit the flotation tank. The bubble generator is in fluid communication with the flotation tank, generates a plurality of bubbles and supplies the plurality of bubbles to the flotation tank. The acoustic generator is configured to generate and impart acoustic energy to the flotation tank. As acoustic energy is imparted to the flotation tank, the bubbles at least partially aggregate, and as the plurality of bubbles that are at least partially aggregated float, they connect with at least some of the particles such that at least some of the particles float.

A product and method of producing a product that may comprise diatomaceous earth, clay and dispersant. The clay may comprise (a) attapulgite or (b) sepiolite or (c) attapulgite and sepiolite. A portion of the clay and a portion of the diatomaceous earth is agglomerated to form a plurality of composite particles, wherein the composite particle is at least partially surface treated with the dispersant. The product may have a particle size distribution having a d50 of 5-40 microns and a d10 of 1-15 microns. The product may have a median pore diameter of 2-10 microns, a pore volume of 1-4 mL / g and a bulk density of 50-300 kg / m3.

The invention relates to the technical field of purification of beta-alanine, and discloses a method for separating and purifying beta-alanine from fermentation liquor. The invention provides a method for separating and purifying beta-alanine from fermentation liquor by combining flocculation and resin to overcome the defects that an existing process for separating and purifying beta-alanine from fermentation liquor is tedious in route, high in cost and technology, large in energy consumption and the like. Impurity substances can be effectively removed through the steps of flocculation impurity removal, protein removal, resin adsorption decoloration, resin adsorption elution refining and crystallization extraction of beta-alanine, and the obtained product is high in purity. Meanwhile, the method is simple to operate, mild in process condition and low in cost.

A vehicle (6) apparatus for removing material from the seabed is disclosed. The vehicle comprises a first propulsion unit (10) for moving the vehicle vertically and a second propulsion unit (12) for moving the vehicle horizontally. A collection unit (16) removes material from the seabed and a latching mechanism (42) is adapted to be coupled to the riser to allow transport of the removed material to a vessel above the water surface.

The device comprises a base, a mixing mechanism and two quantifying mechanisms are arranged on the upper side of the base, each quantifying mechanism comprises a quantifying box, a threaded cylinder, a conveying pipe and a quantifying plate, the quantifying boxes are arranged on the upper side of the base, and a supporting frame is fixedly installed between the inner walls of the upper ends of the quantifying boxes; the threaded cylinder is rotationally installed between the supporting frames, a threaded groove is formed in the conveying pipe, the conveying pipe is in threaded connection with the threaded cylinder through the threaded groove, and the quantifying plate is slidably installed in the quantifying box. According to the accurate medicament adding device of the sedimentation tank, the dosing amount of the quantifying mechanism can be adjusted to the required volume according to the required medicament adding amount through the arranged quantifying mechanism, so that the medicament can be accurately metered, the accurate medicament adding is realized, and the medicament adding efficiency is improved. Therefore, the situation that the dosage is too much or too little is effectively avoided.

The utility model discloses a rotating shaft turning plate slag scraping device for sewage treatment, which comprises a truss, turning plate main bodies, a driving box and a fixing frame, the turning plate main bodies are uniformly distributed on the two sides of the bottom of the truss, the driving box is arranged above the truss, the top end of the driving box is provided with a rotating shaft main body, and the rotating shaft main body is arranged on the fixing frame. A gear is arranged in the center of the interior of the driving box, one side of the gear is meshed with a rack, the bottom end of the rack extends to the position below the driving box, a fixing frame is arranged at the bottom end of the rack, the fixing frame is connected with a truss through a connecting shaft, and a driving motor is fixed to one side of the driving box. By installing the rotating shaft body, the truss, the turning plate body, the driving box, the driving motor, the gear, the rack, the fixing frame, the connecting shaft, the guide groove and the guide block, the turning plate body can make contact with the bottoms of sewage treatment pools with different depths to work, meanwhile, the contact pressure between the turning plate body and the bottoms of the pools is moderate, and the mud scraping efficiency is improved.

To provide a method for producing an iodine component-containing aqueous solution which can maintain iodine ion concentration while reducing fluoride ion concentration and / or phosphate ion concentration in non-treatment water by a coagulation method.SOLUTION: A method for producing an iodine component-containing aqueous solution includes: a coagulation step of bringing non-treatment water containing iodine ions, fluoride ions and / or phosphate ions into contact with an inorganic coagulant which more selectively reacts with the fluoride ions and / or the phosphate ions than the iodine ions, and obtaining an aggregate obtained by reacting the fluoride ions and / or the phosphate ions with the inorganic coagulant; and a separation step of removing the aggregate from the non-treatment water, and causing the iodine ions to remain in the non-treatment water and thereby obtaining treatment water.SELECTED DRAWING: Figure 1

The utility model relates to the field of sealing structures, in particular to an anti-seepage sealing structure of a sedimentation tank. According to the technical scheme, absorbent cotton is arranged on the inner side of an outer pool body, a fixing column is arranged between every two adjacent sets of absorbent cotton, an inner ring waterproof layer is arranged on the inner side of the absorbent cotton, a clamping groove plate is arranged at the upper end of the inner ring waterproof layer, a frame is arranged at the upper end of the clamping groove plate, a connecting column is arranged at the upper end of the frame, and a connecting belt is connected to the connecting column in a hung mode. A waterproof film is arranged between the connecting belts, a pressing ring is arranged outside the connecting column, a top cover is arranged at the upper end of the pressing ring, and a surrounding plate is arranged at the upper end of the top cover. According to the utility model, the external pool body is used for external protection, the inner waterproof layer is used for internal water prevention, the fixing columns are arranged in the gap enclosed by the external pool body and the inner waterproof layer to fix the absorbent cotton, the water condensation particles are arranged around the absorbent cotton, and the absorbent cotton and the water condensation particles realize secondary water seepage prevention. And the waterproof film performs water seepage prevention protection work.

The invention relates to a method for dewatering a solid-liquid mixture, comprising the steps of providing a solid-liquid mixture; adding a drainage aid to the solid-liquid mixture; and reducing the liquid content in the solid-liquid mixture to ≤ 25% by mass. The invention further relates to a composition with a solid and a liquid to be separated from it, wherein the composition comprises a drainage aid that is surface-active and reduces a positive interaction between a surface of the solid and the liquid of the composition and / or has a porous and / or fibrous structure that facilitates the flow of the liquid through pores and / or along a surface.

The present disclosure provides a preparation system and a preparation method for xylitol crystals. In the preparation system, outlets of a first centrifuge are connected with an inlet of a hot air drying tank and an inlet of a primary mother liquor storage tank through pipelines, respectively. Outlets of a second centrifuge are connected with an inlet of a second fluidized bed dryer and an inlet of a secondary mother liquor storage tank through pipelines, respectively. An outlet of a dicrystalline sugar dissolution tank is connected with an inlet of a blending tank through a pipeline. An outlet of a tricrystalline sugar dissolution tank is connected with the inlet of the primary mother liquor storage tank. The blending tank is provided with an inlet for a raw material of xylitol hydrogenation solution. An output of an outlet of a first fluidized bed dryer is prepared xylitol crystals.

The embodiment of the invention discloses an intelligent cooperative regulation and control method and system for coal mine underground water treatment and back-supplement, and the method comprises the steps: obtaining the inflow water quality time sequence data of primary mine water, and predicting the optimal inflow water flow based on the inflow water quality time sequence data through a bidirectional long-short-term memory network, adjusting the water inflow of the sedimentation tank to the flow so as to carry out sedimentation pretreatment on the primary mine water; multi-dimensional membrane operation parameters of the ultrafiltration membrane are obtained after pretreatment, the pollution degree of the ultrafiltration membrane is determined based on the parameters through a variational auto-encoder, an ultrafiltration membrane cleaning strategy is dynamically adjusted based on the pollution degree, and cleaning operation is executed; and after cleaning, acquiring underground hydrological data and refilling water quality data of the target refilling area, and determining a distribution scheme of each refilling well by utilizing a water volume dynamic distribution prediction model fusing a time sequence convolutional network, a gating mechanism and a self-attention mechanism in combination with the underground hydrological data and the refilling water quality data. And according to the distribution scheme, water reaching the standard is supplemented to the target underground water layer through the corresponding supplementing well.

An acoustofluidic device and a method for trapping particles with a positive acoustic contrast contained in a moving carrier fluid are disclosed. The device comprises a first channel (11) channelling the moving carrier fluid (14) and a second channel (12). The first channel (11) and a portion (121) of the second channel that is parallel to the first channel (11) are separated by a common separating wall (13). A driving circuitry (31) driving an acoustic transducer (30) is configured to drive the latter at a frequency at which an acoustic radiation force (17) is generated on the particles in the first channel (11) that points towards a displacement antinode of a vibrational eigenmode of the separating wall (13), while at least two counter-rotating streaming vortices (18) are formed by the moving carrier fluid (14) which, in combination with the acoustic radiation force (17), form a particle trap (19) at said displacement antinode of the eigenmode.

A transport vehicle (6) device for removing material from the seabed is disclosed. The transport vehicle includes a first propeller (10) for vertical movement of the transport vehicle and a second propeller (12) for horizontal movement of the transport vehicle. A collector unit (16) removes material from the seabed, and a locking mechanism (42) is adapted to connect to a riser so that the removed material can be transported to a vessel on the water surface.