974 results about "Gypsum" patented technology

The invention provides a concrete super-early-strength quick-hardening material, and relates to the field of building materials. The high-strength concrete comprises the following components in percentage by mass: 40%-50% of calcium aluminate, 30%-40% of gypsum, 8%-15% of high aluminum, 1%-3% of an additive, 3%-12% of an exciting agent and 1%-5% of an auxiliary material. According to the super-early-strength quick-hardening material provided by the invention, hour-level strength can be quickly and stably improved, and the strength increasing curve of each age is smooth and stable, so that the requirements of scenes such as road repair and tunnel construction on early strength can be met; it can be guaranteed that the 28-day compressive strength of the material breaks through 70 MPa, the later strength is kept stable, and the long-term safety of an engineering structure is guaranteed; the anti-seepage, anti-freezing and anti-erosion capabilities are realized in a complex environment, the service life of a project can be effectively prolonged, and the maintenance cost is reduced. In addition, the invention further provides a preparation method of the concrete super-early-strength and quick-hardening material, and the preparation method is used for preparing the super-early-strength and quick-hardening material provided by the invention.

The invention belongs to the technical field of industrial solid waste resource recycling, and discloses a nano composite filling material based on in-situ acid-base mutual modification enhancement and application thereof. According to the nano composite filling material, the alkalinity of the red mud and the acidity of the desulfurized gypsum are used for neutralization, the alkalinity of a system is reduced, a synergistic reaction is excited, a large number of ettringite crystals playing a key enhancing role are generated under the regulation and control of a nano material, and the ettringite crystals and a geopolymer form an interpenetrating network structure. The obtained slurry is low-viscosity and high-fluidity Newtonian fluid (diffusivity gt and 250 mm), the 7-day strength is larger than 2.0 MPa, the pH value is 7-9, and the fluorine ion concentration is lt; and the leaching of heavy metal ions is qualified, and the method is environment-friendly and safe. Efficient resource utilization of the red mud and the desulfurized gypsum is achieved, and the method is simple in process, low in cost and especially suitable for mine filling and engineering backfilling.

A full solid-waste micro-expansive concrete and its preparation method are provided, and relate to the field of concrete material technologies. The full solid-waste micro-expansive concrete includes the following components in parts by weight: 920-1060 parts of a coarse aggregate, 460-582 parts of a fine aggregate, 11-19 parts of an expansive agent, 389-512 parts of a modified solid-waste-based cementitious material, and 231-268 parts of water. The coarse aggregate is coal gangue. The fine aggregate is waste ceramic. The modified solid-waste-based cementitious material includes a solid-waste-based clinker, modified polyvinyl alcohol, and a modified anion exchange resin. The solid-waste-based clinker is prepared from the coal gangue, carbide slag, and desulfurization gypsum. The expansive agent is obtained by calcining the carbide slag. The concrete prepared can ensure the initial strength of the concrete, and guarantee continuous micro-expansion in the later stage, compensating for shrinkage and thereby increasing the overall strength of the concrete.

The invention discloses a mineral-based quick-setting high-strength grouting material for reinforcing high-altitude tunnel surrounding rock and a use method thereof, the mineral-based quick-setting high-strength grouting material is composed of a cementing material, sand and an additive, the cementing material is composed of Portland cement, aluminate cement, semi-hydrated gypsum and sulphoaluminate cement; the additives comprise a modifier, a coagulant, a retarder, a defoaming agent, a mineral admixture and an anti-freezing agent; the use amounts of the sand, the modifier, the coagulant, the retarder, the defoaming agent, the mineral admixture and the anti-freezing agent are respectively 2-3%, 0.1-0.5%, 0.1-0.5%, 0.1-0.5%, 0.1-0.5%, 0.5-1.5% and 10-20% of the mass of the cementing material. The rapid-hardening high-strength grouting material is suitable for high-altitude tunnel engineering with low average temperature throughout the year, and the rapid-hardening high-strength grouting material at low temperature can be rapidly hardened and achieve the effect of high strength without pre-curing by reasonably regulating and controlling the proportion of the components of the grouting material.

The invention provides light non-sintered ceramsite and a preparation method thereof, the non-sintered ceramsite is of a core-shell structure, an inner core is expanded perlite, a shell takes granite stone powder and desulfurized gypsum as main raw materials, and an interface modifier is added into the non-sintered ceramsite; the interface modifier comprises the following components in percentage by mass: 3%-8% of a silane coupling agent, 10%-18% of a nano silicon dioxide dispersion liquid, 25%-35% of a polyvinyl alcohol aqueous solution, 1.5%-3% of sodium carboxymethyl cellulose and the balance of deionized water. An interface modifier is added into the unfired ceramsite which takes expanded perlite as an inner core and takes a solid waste mixture such as granite powder and desulfurized gypsum as a shell, and the interface modifier can improve the physical and chemical characteristics of the surface of the expanded perlite and also can promote hydration reaction and interface bonding of shell slurry through a multi-component synergistic effect; the mechanical property and the stability of the unfired ceramsite are obviously improved.

The invention relates to the technical field of building materials, and particularly discloses an aluminate amorphous strength accelerator for steam-curing-free concrete as well as a preparation method and application of the aluminate amorphous strength accelerator. The invention discloses an aluminate amorphous strength accelerator for steam-curing-free concrete. The aluminate amorphous strength accelerator is prepared from the following raw materials in parts by weight: 35 to 45 parts of calcium aluminate amorphous powder, 55 to 65 parts of high-activity gypsum, 1 to 2 parts of an early strength type powder polycarboxylic acid water reducing agent, 0.1 to 1 part of lithium salt, 0.1 to 0.5 part of a retarder, 0.02 to 0.05 part of a reinforcing agent and 1 to 3 parts of a nano early strength agent, the proportion of amorphous glass in the calcium aluminate amorphous powder is greater than 85%; the calcium aluminate amorphous powder and the high-activity gypsum are doped into the Portland cement for synergistic hydration, and the early strength type powder water reducing agent, the lithium salt, the reinforcing agent and the nano early strength agent are utilized for synergistic interaction, so that the early strength and the volume stability of the prefabricated part are improved.

The invention discloses a gypsum dehydration control method and system based on multi-parameter collaborative optimization, belongs to the technical field of gypsum dehydration control, and solves the problem of how to improve gypsum dehydration efficiency under a dynamic working condition. Comprising the steps of collecting key operation parameters, a parallel operation mechanism model and a data driving model in the gypsum dehydration process in real time, constructing a weighted multi-objective optimization function based on constraint conditions, performing real-time optimization by adopting model prediction control, and performing global multi-objective optimization by adopting a periodic evolutionary algorithm. Generating a final control instruction based on the fusion strategy and issuing the instruction to an execution mechanism; by combining multivariable real-time prediction, closed-loop optimization control and a self-adaptive learning mechanism, intelligent management is carried out on the dehydration process of the wet desulphurization byproduct gypsum, accurate control over the water content of a filter cake, optimization of washing water and energy consumption and high adaptability of a control system to dynamic working conditions are achieved, and the dehydration efficiency of the wet desulphurization byproduct gypsum is improved. Therefore, on the premise of ensuring the quality of the gypsum, the dehydration efficiency is maximized and the resource consumption is minimized.

The invention discloses a goaf filling material based on coal slime and a carbon sequestration method. The goaf filling material comprises the following steps: preparing a composite activator and a plurality of pretreated coal slime, steel slag, superfine slag powder and desulfurized gypsum raw materials; the preparation method comprises the following steps: mixing coal slime, steel slag, superfine slag powder, desulfurized gypsum raw materials and a composite activator in proportion, putting into a closed reaction kettle, and carrying out dry mixing and sufficient stirring; adding a proper amount of water into the dry-mixed raw materials according to a solid-to-liquid ratio of 7: 3, and stirring the water and the raw materials through a reaction kettle until the water and the raw materials are fully mixed to form a strong alkali mixture; filling CO2 gas into the reaction kettle, carrying out primary mineralization reaction, and stirring in the reaction kettle to obtain a paste filling material; conveying the paste filling material to a goaf through a pump body, and performing filling operation according to a preset filling process; and after the filled paste filling material is initially set, secondary mineralization reaction is carried out, supercritical CO2 gas is injected into the paste filling material through the pre-buried pipeline, residual alkaline substances in the paste filling material react, and a compact anti-seepage structure is formed.

The invention discloses a raw material uniformity mixing control method based on wet flue gas desulfurization gypsum slurry, which comprises the following steps: constructing a time sequence working condition data set by collecting process data such as feeding rate, slurry concentration, particle size distribution and stirring parameters, and extracting main dynamic characteristics of shearing and agglomeration based on an SINDy algorithm; the method comprises the following steps: establishing a state evolution model, inputting a current working condition into the model to generate a state evolution path, collecting shear strength and aggregation degree observation data at key nodes of the path, and identifying an implicit state and an estimation error of a system by adopting a horizon estimation algorithm and combining a historical process trajectory and a control constraint condition. When the prediction deviation exceeds the limit, model structure adjustment and parameter updating are triggered, regulation and control output quantity is generated based on the model deviation, a control instruction is output, dynamic optimization control over the slurry mixing uniformity is achieved, working condition changes can be dynamically adapted, and the slurry mixing uniformity and the process stability are improved.

The invention discloses a method for preparing an underground cemented high-water-expansion filling material from negative carbon all-solid waste and application, the method comprises the following steps: raw material pretreatment: mixing magnesium slag, steel slag and a dispersion medium to prepare solid waste slurry, adding an inducer into the solid waste slurry, and carrying out wet ball milling treatment to obtain first slurry; wet grinding and carbonization: under the condition of continuously introducing CO2, carrying out wet ball-milling treatment on the first slurry to obtain second slurry; thickening and expansion regulation and control: adding a thickening agent and an expansion regulation and control agent into the second slurry, then carrying out wet ball milling treatment to obtain third slurry, mixing and molding, mixing the third slurry with a dispersion medium, gypsum and copper tailings, and carrying out vibration molding to obtain the underground cementing high-water-expansion filling material. The method takes industrial solid waste as a raw material, has double benefits of carbon sequestration and resource utilization, and is suitable for projects such as mine goaf filling and the like.

The invention discloses a low-strength high-fluidity mining area roadway filling material as well as a preparation method and application thereof, and belongs to the technical field of mine filling materials. The invention provides a low-strength high-fluidity mining area roadway filling material. The low-strength high-fluidity mining area roadway filling material is prepared from the following raw materials in parts by mass: 40-60 parts of tailings; 20 to 40 parts of smelting slag; 3-8 parts of cement; 2-5 parts of desulfurized gypsum; 8 to 15 parts of pre-activated low-calcium fly ash; 0.003 to 0.01 part of graphene oxide; 0.1 to 0.3 part of a water reducing agent; 0.05 to 0.15 part of a thickening agent; 0.05 to 0.15 part of a retarder; mixing water; the water-binder ratio is 0.42 to 0.48. The filling material disclosed by the invention has low strength, high slump and high solid waste mixing amount, and effectively solves the industrial problems of difficulty in secondary mining and removal, low roof contact rate and insufficient solid waste utilization.

The invention relates to the technical field of gypsum boards, and particularly discloses a gypsum plaster board and a production process thereof. The invention relates to a gypsum plaster board, which comprises a board core and surface protection paper adhered to the two surfaces of the board core, and the board core comprises the following raw materials: 80-120 parts of gypsum clinker; 5 to 15 parts of vermiculite powder; 5-10 parts of modified elastic microspheres; 6-12 parts of porous soundproof mineral particles; 3-7 parts of glass fiber; 5 to 10 parts of silicon dioxide aerogel particles; 3-7 parts of aluminum hydroxide micro powder; 2 to 5 parts of acrylate emulsion; 2-5 parts of talcum powder; 0.5-2 parts of a water reducing agent; 30 to 50 parts of water; the modified elastic microspheres are nitrile rubber microspheres coated with an ethylene-vinyl acetate copolymer. According to the gypsum plaster board, the modified elastic microspheres and the porous sound insulation mineral particles are introduced to cooperate with other raw materials, so that the anti-cracking performance and the sound insulation performance of the gypsum plaster board are effectively improved.

The invention discloses a solid waste-based mine filling composite material and application thereof in a separation layer filling treatment system. The composite material is prepared from the following components in percentage by mass: an aggregate component: 30-60% of coal gangue fine powder; a gelling component: 10%-25% of desulfurized gypsum; an activator component: 5%-15% of an alkali activator; and auxiliary components: 5%-15% of fly ash and 0.5%-2% of an early strength water reducing agent. According to the solid-waste-based mine filling composite material and the application of the solid-waste-based mine filling composite material in a bed separation filling treatment system, industrial solid waste is used as a main raw material, an optimized composite system is constructed, and through the synergistic effect of all the components, good balance of slurry fluidity, setting time and early strength is achieved; the obtained slurry has excellent pumpability and stable diffusivity, can effectively permeate and fill separation cracks, is controllable in setting and hardening time, meets the requirements of different engineering scenes, and realizes efficient and high-valued utilization of solid waste resources.

The invention discloses a multi-coal-seam hexahedron test piece manufacturing and collaborative hydraulic fracturing experiment method, and relates to the technical field of coal seam hydraulic fracturing, and the method comprises the following steps: S1, collecting raw coal of different coal seams in a target mining area, and collecting a roof rock stratum material and a floor rock stratum material of the corresponding coal seam, or preparing a raw material ratio of cement, sand, gypsum and calcium carbonate, the collected materials are treated; according to the method, the multi-coal-seam hexahedron test piece containing the coal-rock stratum structure is prepared according to the on-site stratum proportion, the mechanical property and the contact state of the multi-coal-seam and the rock stratum are reduced, accurate butt joint of the experiment and on-site engineering is achieved, differential fracturing pipe arrangement and synchronous fracturing operation based on the coal seam hardness characteristic are adopted, a traditional single-layer fracturing mode is broken through, and the experiment efficiency is improved. The experiment period and the site construction period are shortened, real stratum stress is simulated through true triaxial stress loading, real-time pressure monitoring, scanning and other accurate detection analysis are conducted, and the expansion rule of cracks between coal and rock stratums is captured.

The utility model provides a rotary screen device for a gypsum powder production line, and relates to the technical field of gypsum powder production and processing, the rotary screen device comprises a device shell, one side of the top of the device shell is provided with a smashing barrel, the smashing barrel is internally provided with a first smashing assembly, the device shell is internally provided with a feeding cavity, and the feeding cavity is internally provided with a second smashing assembly; a filtering cavity is formed in the device shell and located on the other side of the feeding cavity, a rotary screen drum is arranged in the filtering cavity, a driving box is arranged on the other side of the interior of the device shell, a transmission shaft is arranged on one side of the driving box and connected with the rotary screen drum, and a second smashing assembly is arranged in the rotary screen drum. A collecting box is fixedly connected to the bottom of the device shell, a collecting cavity is formed in the collecting box, and a guiding-out assembly is arranged between the smashing barrel and the feeding cavity.

The utility model discloses an anti-clamping roller mechanism of a desulfurization vacuum belt conveyor, and relates to the technical field of limestone-gypsum wet desulfurization equipment optimization. The device comprises a belt roller, positioning columns are coaxially installed on the two sides of the belt roller, one positioning column is coaxially connected with a power mechanism, the positioning columns are rotatably installed on a supporting frame, containing gaps are formed in the supporting frame, and the positioning columns penetrate through the containing gaps. The outer wall of the positioning column is connected with the inner wall of the containing gap through a bearing, the bearing is arranged in the containing gap, a plugging cavity is formed between the inner wall of the containing gap and the outer wall of the positioning column, and a plugging medium conveying mechanism is arranged in the supporting frame. The discharging end of the plugging medium conveying mechanism is communicated with the plugging cavity; the problems that according to an existing belt conveyor, a roller is prone to being clamped due to large slurry viscosity, and after the belt conveyor is shut down for a long time, a power roller is prone to being stuck are solved.

This utility model discloses a waterproof structure for lightweight aggregate concrete partition walls, relating to the technical field of concrete partition walls. It includes an autoclaved aerated concrete (AAC) plate, with two foamed sandwich panels fixed to its outer wall. Gypsum board is fixed to the side of each foamed sandwich panel that is far from each other. A reinforcing plate extends from one side of the AAC plate, and a retaining strip extends from the side of the reinforcing plate away from the AAC plate. A retaining groove is formed between the end of the AAC plate away from the reinforcing plate and the two foamed sandwich panels. The AAC plate, reinforcing plate, and retaining strip are integrated. Through the AAC plate, reinforcing plate, retaining strip, retaining groove, main reinforcing groove, and secondary reinforcing groove, the overall structural strength of the wall can be enhanced. Simultaneously, the wall is spliced ​​using a retaining method, and the space at the splice can be used to pour cement slurry, filling the splice to increase the stress points of the wall and improve the overall strength of the wall.

The invention relates to a natural building material panel consisting of individual blanks made of clay and loam, which are arranged seamlessly and offset and are connected by force. Since the individual components (blanks) are already dry, the panel production process is not subject to drying shrinkage, and the final panel can be as large as an entire wall. The overlaps and the fully bonded paper reinforcements on the top and bottom surfaces, as well as between the layers, provide sufficient reinforcement to withstand flexural loads. The internal reinforcements are temporarily protected by the resting blanks in case of fire or water, thus keeping the plate dimensionally stable for longer.

The invention provides a treatment method and device for intelligently and comprehensively utilizing solid waste of a thermal power plant, and relates to the technical field of resource utilization of the solid waste of the thermal power plant, and the method comprises the steps that a multi-mode sensor array detects the particle size, components and magnetic characteristics of the solid waste in real time, and slag, fly ash and desulfurized gypsum are classified through a machine learning model; constructing a virtual model by means of digital twinning, optimizing a melting temperature parameter through deep reinforcement learning, uploading monitoring data to a cloud end through edge calculation, and triggering process adaptive adjustment; iron elements are recycled by a wet high-gradient magnetic separator, copper and aluminum metals are extracted by smelting reduction of non-magnetic slag, and a composite building material is prepared from residues or 5-25mm inert slag is used as a road base; rare metals such as vanadium, titanium and nickel are extracted from residual slag through acid leaching, leaching liquid is subjected to solvent extraction or ion exchange enrichment, processing data are stored through a block chain, and traceability of the whole life cycle is achieved. The comprehensive resource utilization rate of the solid waste of the thermal power plant is remarkably improved, and meanwhile the overall treatment energy consumption is reduced.

This application discloses a curing agent for fluidized solidified soil and its preparation method. The curing agent comprises the following raw materials by weight: 30-45 parts of sulfoaluminate cement, 15-30 parts of gypsum, 10-15 parts of steel slag, 15-25 parts of mineral powder, 3-4.5 parts of carboxymethyl cellulose, 10-15 parts of attapulgite, 5-10 parts of sodium sulfate, 5-10 parts of silane coupling agent modified glass microspheres, and 60-80 parts of water. The curing agent for fluidized solidified soil provided in this application can improve the compressive strength and stability of the solidified soil.

The invention relates to the technical field of building materials, and particularly discloses a 3D texture interior wall decorative plate and a preparation method thereof. The 3D texture interior wall decorative plate comprises the following raw materials: cement, gypsum, fly ash, quartz sand, talcum powder, modified polyvinyl alcohol, modified bentonite, hydroxypropyl methyl cellulose and water. The modified polyvinyl alcohol is polyvinyl alcohol grafted and modified by sodium lignin sulfonate; the modified bentonite is obtained by modifying bentonite through stearic acid. The 3D texture interior wall decorative plate has good water resistance and can meet the use requirements of decoration of various interior walls of residences, office buildings and the like.

The utility model relates to a thick-thin separation ultra-low emission desulfurization system which comprises a thick tower, a thin tower, a thick liquid circulating pool and a thick liquid circulating pump which are communicated with one another, concentration towers and dilution towers with the corresponding number are correspondingly arranged, one concentration tower corresponds to one dilution tower, a plurality of concentration towers and a plurality of dilution towers are parallel, discharged liquid of all dilution towers enters the same concentrated liquid circulating pool, and concentrated liquid of all concentration towers also enters the same concentrated liquid circulating pool. Gypsum slurry is uniformly discharged from the concentrated liquid circulating pool by a gypsum discharge pump to a public gypsum dehydration system for dehydration; according to the utility model, SO2 in boiler flue gas is eluted by connecting the thick tower and the light tower in series, a plurality of boilers share one thick liquid circulating pool, and a thick-thin separation state of high concentration and low PH value of thick tower slurry and low concentration and high PH value of light tower slurry is kept during operation, so that desulfurization is efficiently graded from the source, the generation concentration of particulate matters in the desulfurization tower is reduced, and the desulfurization efficiency is improved. The method has the advantages of high desulfurization efficiency, low desulfurization agent consumption and the like.

The utility model relates to the field of steel structures, in particular to an energy-saving fireproof steel structure of a green building, and adopts the technical scheme that the energy-saving fireproof steel structure of the green building comprises a gypsum shell, I-shaped steel, a fireproof frame plate, a fireproof frame, an expansion plate, a fireproof plate and fireproof cotton, the expansion plate is made of expanded silicate materials, the fireproof cotton is of an expansion type, and the fireproof plate is made of expanded graphite materials. First groove bodies are formed in the front ends and the rear ends of the fireproof frames in a penetrating mode, expansion plates are installed in the first groove bodies, extending frames distributed at equal intervals are fixedly connected to the ends, close to each other, of the fireproof frames, and limiting frames distributed at equal intervals are fixedly connected to the ends, away from each other, of the fireproof frame plates. By means of the expansion plates distributed on the upper side and the lower side of the I-shaped steel and the fireproof plates and the fireproof cotton distributed on the inner walls of the left side and the right side of the I-shaped steel, when a fire disaster occurs, the I-shaped steel can be heated to expand so as to fill a gap between the gypsum shell and the I-shaped steel, and the expansion materials form an internal fire insulation layer to isolate external high temperature so as to protect the I-shaped steel.

The application discloses a kind of solid waste-based cementing material of coal-fired power plant and preparation method thereof, belong to building material technical field.The material is made of the following weight parts of raw materials: 50-70 parts of fly ash, 10-30 parts of mineral powder, 10-30 parts of desulfurization gypsum, 1-5 parts of activator, 1-5 parts of seed crystal.The key of its preparation method lies in by implanting pre-synthesized C-S-H seed crystal, as nucleation base point in the hydration process of cementing material, effectively stimulate the potential activity of solid waste, induce the formation of dense hydration product structure.Cementing material prepared by the application has the advantages of high strength, low cost, environmental protection, etc., realizes the high value-added resource utilization of solid waste of coal-fired power plant.

1. Name of the product in this design: Plaster molding light trough fixing profile (sloping L-shaped reflector trough). 2. Purpose of this design: for interior and exterior decoration. 3. The key design feature of this product is its shape. 4. The image or photograph that best illustrates the design's key points: a 3D model.

The utility model discloses a feeding device for gypsum powder production, which relates to the field of feeding equipment and comprises a bucket elevator, a discharging pipe is fixedly mounted on the upper portion of the bucket elevator and sleeved with a material bundling assembly, the material bundling assembly comprises a material bundling pipeline, and dust removal assemblies are fixedly mounted on the discharging pipe and the material bundling pipeline. The dust removal assembly is composed of a dust suction fan, a dust removal pipeline, a protective blocking net and a dust filtering assembly, the dust removal pipeline is fixedly connected with the dust suction fan, and flying dust generated in the gypsum powder discharging process can be effectively collected by arranging the dust removal assembly composed of the dust suction fan, the dust removal pipeline, the protective blocking net and the dust filtering assembly; the dust concentration in a workshop is remarkably reduced, the working environment is improved, the cleaning and maintenance cost is reduced, the material loss can be reduced, the production efficiency is improved, the production cost is reduced, meanwhile, filtered clean air can be directly discharged, and the environmental protection requirement is met.

The invention discloses a color plastering gypsum slurry continuous production system based on multistage dynamic mixing and a control method, and the color plastering gypsum slurry continuous production system comprises a first-stage eddy current premixing device, a second-stage eddy current premixing device, a third-stage eddy current premixing device and a third-stage eddy current premixing device, the second-stage dynamic shearing and mixing device is used for carrying out dynamic shearing and mixing on the premixed colored plastering gypsum dry powder raw materials and additives, and the third-stage ultrasonic homogenizing device is used for carrying out ultrasonic homogenizing treatment on the colored plastering gypsum slurry subjected to dynamic shearing; the first-stage vortex premixing device, the second-stage dynamic shear mixing device and the third-stage ultrasonic homogenizing device are sequentially connected in series through negative pressure screw conveyors. According to the invention, a series of vortex premixing, dynamic shear mixing and ultrasonic homogenizing mixing treatments are carried out on colored plastering gypsum raw materials; the dispersion uniformity in the production process of the colored plastering gypsum slurry is gradually improved, and efficient and high-quality continuous production of the colored plastering gypsum slurry is realized.

The invention provides a bone plate linkage mounting method for a light steel keel partition wall, which comprises the following steps of: connecting the bottom end of at least one vertical keel positioned at a key position of a wall body with a ground keel, and temporarily fixing the vertical keel; temporarily fixing a first gypsum board on the temporarily fixed vertical keel, and adjusting the position of the first gypsum board to enable the first gypsum board to reach preset perpendicularity and planeness, so that the first gypsum board forms a structural reference surface with initial rigidity; the next vertical keel adjacent to the first gypsum board is installed on the basis of the structure datum plane; and the subsequent gypsum boards and the vertical keels are alternately installed until the vertical keels and the gypsum boards on one side of the wall body are all installed. The technical problems that in the prior art, under the special working conditions that no upper fixing point exists or a special-shaped structure exists, a framework is difficult to fix and form, and construction precision is low are solved.

This invention belongs to the field of metallurgical solid waste resource utilization technology, specifically involving a method for recovering rare and precious metals from smelting acid sludge. It includes: (1) oxidative leaching of smelting acid sludge using a sulfuric acid-hydrogen peroxide leaching system to obtain a selenium-containing solution and gypsum slag; (2) reduction of the selenium-containing solution using a reducing agent to obtain crude selenium; (3) pre-sulfurization of the gypsum slag obtained in step (1), followed by solid-liquid separation to obtain sulfidated gypsum slag; and (4) enrichment of silver and other precious metals in the sulfidated gypsum slag obtained in step (3) using an agglomeration flotation method. The oxidative leaching process in this invention differs from the traditional sulfuric acid-nitric acid leaching system. It uses green and clean hydrogen peroxide as the oxidant, without introducing other interfering elements, avoiding the problem of re-dissolution during selenium reduction, thereby reducing the amount of reducing agent used. Furthermore, the leaching temperature is lower than that of the traditional oxidative leaching process, thus reducing energy consumption and cost.