141 results about "Baryte" patented technology

The invention relates to the technical field of production quality traceability, in particular to a barite powder production quality traceability-oriented data fusion method and a barite powder production quality traceability-oriented data fusion system. The method comprises the following steps: collecting mineral parameters of barite ores in raw ore sampling points as raw ore batch data; collecting monitoring data of the crusher; according to raw ore batch data and crusher monitoring data, the granularity change condition of barite is determined; collecting control data of the grinding device; determining the grain size refining condition of the barite according to the control data of the grinding device and the grain size change condition of the barite; dry packaging control data and packaging weighing results are collected; calculating the final particle size of the product based on the barite particle size refining condition, the drying packaging control data and the packaging weighing result; predicting a target quality index according to the final granularity of the product; and comparing index differences between the target quality index and the actually obtained quality inspection data of the finished product one by one so as to execute difference traceability. According to the invention, the quality controllability and tracing efficiency of barite powder production can be improved.

The invention discloses a surface lipophilic modified barite weighting material as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The surface lipophilic modified barite weighting material comprises barite and a surface modifier, and the surface modifier comprises a copolymer formed by polymerizing a monomer A, a monomer B, a monomer C and a monomer D. According to the invention, the lipophilicity of the barite is chemically modified by the surface modifier, and all monomers have a synergistic effect, so that when the grafted and modified barite weighting material is used as the weighting agent of the oil-based drilling fluid, the dispersity and the stability of particles in the oil-based drilling fluid can be improved, and the rheological property, the plugging property and the high-temperature resistance of the drilling fluid can be adjusted.

The invention discloses a method for quantitatively testing the content of organic carbon and disseminated particle size in gold ore, and belongs to the technical field of gold ore detection. The method comprises the steps of sample preparation and quantitative testing, wherein palm wax serves as a cementing agent, barite serves as a standard sample, and a to-be-tested sample is prepared through melting, mixing, consolidation, polishing and carbon spraying; the quantitative test is based on an automatic process mineralogy test system, palm wax backgrounds are removed through backgrounds deduction, an energy spectrum library is established to recognize organic carbon and barite particles, the area ratio of the organic carbon and the barite particles is measured, the mass ratio is converted by combining the density ratio, the organic carbon content of raw ore is inversely calculated, and meanwhile, the particle size distribution of the organic carbon is counted. The method solves the problem that the content and granularity of organic carbon cannot be accurately quantified at the same time in the prior art, has the advantages of high test precision, high efficiency, comprehensive parameters and simplicity and convenience in operation, and can provide key data for optimization of a gold ore cyanidation leaching process.

The application discloses a kind of concrete crack self-repairing agent suitable for marine corrosion conditions, including component one and component two;The component one, component two are all core-shell structure;The outer shell of component one is polymer film;Inner layer includes the following components by mass percentage: 20%-30% barite powder, 50%-60% magnesium source, 20%-30% cement;The outer shell of component two is polymer film;Inner layer includes the following components by mass percentage: 20-30% barite powder, 5-10% microbial powder, 20-30% glucose, 20%-40% aluminum source, 10%-30% low-alkali cement.The repairing agent of the application is continuous grading solid particle pellet, and the fine aggregate of concrete is replaced with equal mass.By the synergistic effect of microbial mineralization and metal mineral hydration, the filling of concrete crack space and the solidification of invasive crack corrosion ions are realized, especially suitable for marine corrosion environment.

The invention discloses a new-type barite deposit mineralization mode construction method based on a same sedimentary fault. The method belongs to the field of geological exploration and mineral resource prediction, and comprises the following steps: analyzing the earth crust cracking activity history of an earthquake-Hangjian broken basin, and recovering a basin'checkerboard 'structure prototype; by means of field geological survey and research, drilling engineering, geophysics, remote sensing geological big data and the like, north-east-east-direction and north-west-direction co-sedimentary fault networks are identified and modeled, and a deep metallogenic fluid rising and jet flow channel is determined; the metallogenic process is concluded into a hydrothermal jet flow stage and an underwater gravity flow deposition stage, deep fluid is revealed to rise, jet flow and precipitate along a fault, and an ore-rich zone of a composite seabed fan body group is formed; and a geochemical prospecting prediction model combining trace element and sulfur isotope characteristics is established. The method systematically clarifies a coupling mechanism of ore control of the same sedimentary fault, ore-forming fluid migration and gravity flow deposition, and provides a theoretical basis and a technical means for prospecting prediction of the barite deposit in the Hendan-Hangjian fault basin.

The invention provides a soilless phase reservoir protection water-based drilling fluid as well as a preparation method and application thereof, and belongs to the technical field of drilling fluids. The drilling fluid is prepared from the following raw materials in parts by mass: 100 parts of water, 0.2-0.4 part of a first pH regulator, 1-3 parts of a deoxidant, 0.1-0.4 part of a tackifying and shear strength improving agent, 2-4 parts of a filtrate reducer, 4-6 parts of magnesium-aluminum hydrotalcite, 4-6 parts of micro-nano aluminum oxide, 4-6 parts of superfine calcium carbonate, 4-6 parts of a lubricant, 1-2 parts of a corrosion inhibitor and 70-660 parts of an inorganic salt weighting agent. The drilling fluid disclosed by the invention is excellent in high-temperature resistance, good in rheological property and excellent in filtrate loss reduction performance; the drilling fluid disclosed by the invention can be prepared into saturated CaCl2 and saturated CaBr2 systems, does not contain barite and clay, is high in mud cake acid solubility, has permeability recovery of more than 72% after plugging, is good in reservoir protection, and has potential of on-site large-scale application.

The invention relates to the technical field of mineral resource mining and mineral separation, and discloses a barite ore open-pit mining harmless mineral separation novel process which comprises the following steps: S1, adopting an open-pit mining mode, stripping surface coverings, and collecting barite raw ore; s2, raw ore primary washing and separation, specifically, the collected raw ore is washed with water, barite rough ore and primary tailings are separated out, and the primary tailings comprise ore washing muddy water and slag; s3, the ore washing muddy water generated in S2 is separated into coarse particle materials and fine muddy water in a physical separation mode, the coarse particle materials and the fine muddy water are 50 meshes or above, according to the novel barite ore open-pit mining harmless beneficiation technology, through all-component separation and resource utilization of tailings, a traditional tailing treatment mode is thoroughly changed, the ore washing muddy water generated by primary washing of raw ore is recycled, and the ore washing muddy water generated by secondary washing of the raw ore is recycled. Through physical separation, reselection and solid-liquid separation processes, fine sand products, soil backfill materials and process reuse water can be obtained through conversion, and no slurry waste residues exist.

The invention provides a drilling fluid and a preparation method thereof. The drilling fluid comprises the following raw materials: water, bentonite, sodium hydroxide, a filtrate reducer, an inhibitor, potassium chloride, a tackifier, a lubricant, a plugging agent, a film-forming agent and barite. Wherein the film-forming agent is prepared from the following raw materials in parts by weight: 50 to 60 parts of organic silicon solvent, 80 to 100 parts of ethanol water solution, 10 to 15 parts of polyurethane particles and 10 to 15 parts of nano silicon dioxide. The drilling fluid provided by the invention can prevent the drilling fluid or filtrate thereof from entering fine and micro-nano cracks of a shale well section, so that the influence of hydration or capillary force on a shale stratum is reduced, and the well wall stability problem in shale drilling can be fundamentally solved.

Drilling fluid compositions may include a weighting agent, a nitrite-containing compound, and an ammonium-containing compound, where the nitrite-containing compound and the ammonium-containing compound may be encapsulated together in copolymer micro-particles forming encapsulated thermochemical compounds, and where at least one property selected from the group consisting of the density, the plastic viscosity, the yield point, the gel strength, and the pH, of the drilling fluid composition may be substantially similar to the at least one property of a comparable drilling fluid composition devoid of the encapsulated thermochemical compounds. Methods for reducing a filter cake from a wellbore surface in a subterranean formation are also provided. The methods may include introducing into the wellbore the drilling fluid compositions, allowing the drilling fluid composition to reach a temperature in the wellbore sufficient for the encapsulated thermochemical compounds to react, where the reaction of the encapsulated thermochemical compounds generates heat and nitrogen gas.

The application relates to the technical field of barite ore processing, and discloses a barite ore grinding and processing device and method, which comprises a screening cylinder and a grinding mechanism above the screening cylinder, a fixing frame is arranged between the screening cylinder and the grinding mechanism, a screening disc is rotationally connected to the inner wall of the screening cylinder, a screening rotating mechanism is arranged at the bottom of the screening cylinder, the screening rotating mechanism can make the screening disc rotate at high speed, slanted discharging cylinders are arranged on the two sides of the upper portion of the screening disc, one end of each of the discharging cylinders is fixedly connected with the inner wall of the screening cylinder, and the other end of each of the discharging cylinders is fixedly connected with a slanted grinding cylinder. The barite ore can be ground into powder, the powder can keep dynamic movement in the screening process, powder gathering can be effectively prevented, the screening efficiency is obviously improved, unqualified powder screened out can be automatically returned for secondary grinding, a closed loop is formed, and the overall working efficiency is greatly improved.

The invention discloses a high-temperature-resistant reversible emulsion drilling fluid and a preparation method thereof.The high-temperature-resistant reversible emulsion drilling fluid is prepared from, by weight, 30-60 parts of a water phase, 50-70 parts of an oil phase, 3-8 parts of a reversible emulsifier, 0-6 parts of organic soil, 0-5 parts of a wetting agent, 0-5 parts of a filtrate reducer, 0-3 parts of calcium oxide and 0-1800 parts of barite, the general formula of the reversible emulsifier is R-CONH (CH2) aNHb (CH2) c (CH3) d, wherein R is long-chain fatty acid with a plurality of methyl branched chains, and a-d are the number of groups. The reversible emulsifier can be utilized to make up the disadvantages of the traditional oil-based drilling fluid in a mud cake removal stage, and compared with the existing drilling fluid, the oil-based drilling fluid has the advantages of higher temperature resistance and lower filter loss, and can adapt to a wider temperature range.

This invention discloses a fissure grouting material, its preparation method, and its application, belonging to the technical field of radiation protection engineering materials. By mass, its raw materials include: 45-60 parts barite sand, 25-35 parts sulfoaluminate cement, 8-20 parts borax, 2-5 parts boron carbide powder, 1-5 parts nano-gadolinium oxide, 5-15 parts lithium slag powder, 3-8 parts barium sulfate whiskers, 3-8 parts polymer emulsion, 0.5-1.5 parts water-reducing agent, 0.1-0.5 parts stabilizer, and 18-25 parts water. This invention provides high-density gamma-ray shielding through barite sand, achieves all-round neutron protection through a quaternary composite neutron absorption system, enhances the material's toughness and shielding effect through barium sulfate whiskers, and ensures high fluidity and interfacial bonding strength of the grout through the polymer emulsion. This material is particularly suitable for sealing and shielding fissures in the surrounding rock of radioactive tunnels, possessing advantages such as excellent shielding effectiveness, good construction performance, high volume stability, and long-term durability.

The application relates to a separating device for barite powder purification, which comprises a reaction device and fixing feet, the lower end of the reaction device is uniformly fixedly installed with the fixing feet, the power of the motor is turned on, under the rotation of the motor, the stirring mechanism and the material uniformizing mechanism are synchronously rotated, the concentrated sulfuric acid is stirred through the rotation of the stirring mechanism, the barite powder can be intermittently dropped from the storage part through the rotation of the material uniformizing mechanism, is uniformly dispersed through the material uniformizing mechanism, and finally the barite powder is uniformly scattered to the surface of the concentrated sulfuric acid liquid; the concentrated sulfuric acid and the barite powder are fully mixed through the continuous stirring of the stirring mechanism; the impurities in the barite powder can fully react with the concentrated sulfuric acid through the material dropping and stirring, the phenomenon that the barite powder is lumped when being added at one time is avoided, the mixing of the barite powder and the concentrated sulfuric acid is more uniform through the cooperation of the stirring mechanism and the material uniformizing mechanism, and the reaction is more sufficient.

The invention discloses a beneficiation method for recovering barite from tailings, and belongs to the technical field of mineral processing. According to the method, through the technological process of magnetic separation and gravity concentration pre-enrichment, flotation concentration and roasting acid leaching quality improvement, heavy magnetic suspension physical beneficiation, high-temperature roasting and chemical leaching are organically combined, meanwhile, a shaking table technology is optimized, ore grinding is conducted through a stirring mill twice, and BaSO4 grade gt is prepared from low-grade tailings; and 98% of barite concentrate. The technological process provided by the invention is reasonable in structure, high in separation efficiency, small in environmental pollution and easy to realize industrial production.

The invention discloses a production process of high-dispersion barite powder for oil and gas exploitation, and relates to the technical field of grinding processing devices, in particular to the production process of the high-dispersion barite powder for oil and gas exploitation. A plurality of filter plates capable of promoting materials to sequentially slide on the shell are rotationally arranged in the shell, and a rectangular communicating pipe is fixedly connected to the inner bottom surface of the shell. Through the arrangement of the shell, the feeding port, the filter plate, the water pump, the first communicating pipe, a second cavity, a first cavity, a first communicating port, a rectangular communicating pipe, a filter screen, a scraping plate and a deep backflushing mechanism, the effect of comprehensively cleaning barite can be achieved, the barite enters from the feeding port and naturally turns over when sliding down from the filter plate, and therefore the barite can be thoroughly cleaned. Water flow driven by a water pump is sprayed out from the first communicating opening, multi-surface flushing is achieved, and impurities in the grooves can be removed in a targeted mode through pulse type water flow.

This invention discloses a high-temperature resistant, high-density water-based drilling fluid for ultra-deep wells and its preparation method, belonging to the field of oil and gas drilling technology. The drilling fluid is composed of the following components in parts by weight: 100 parts water, 2-5 parts high-temperature resistant modified clay, 150-280 parts composite weighting agent, 8-15 parts high-temperature resistant polymer filtration loss reducer, 3-8 parts core-shell type high-temperature resistant flow modifier, 4-10 parts nano-composite plugging agent, and 2-5 parts high-temperature stabilizer. This invention effectively solves the technical problems of rheological runaway, increased filtration loss, and barite sedimentation in ultra-deep well high-density water-based drilling fluids under high-temperature conditions above 220℃ by utilizing the high-temperature expansion-disintegration mechanism of the core-shell type flow modifier, nano- to micron-level multi-stage plugging, and the close packing of spherical and irregular weighting materials. It exhibits temperature resistance up to 220℃ and a density of 2.80 g / cm³. 3 It has the advantages of low filtration loss under high temperature and high pressure and good sedimentation stability.

Drilling fluid compositions may include a weighting agent, a nitrite-containing compound, and an ammonium-containing compound, where the nitrite-containing compound and the ammonium-containing compound may be encapsulated together in copolymer micro-particles forming encapsulated thermochemical compounds, and where at least one property selected from the group consisting of the density, the plastic viscosity, the yield point, the gel strength, and the pH, of the drilling fluid composition may be substantially similar to the at least one property of a comparable drilling fluid composition devoid of the encapsulated thermochemical compounds. Methods for reducing a filter cake from a wellbore surface in a subterranean formation are also provided. The methods may include introducing into the wellbore the drilling fluid compositions, allowing the drilling fluid composition to reach a temperature in the wellbore sufficient for the encapsulated thermochemical compounds to react, where the reaction of the encapsulated thermochemical compounds generates heat and nitrogen gas.

The utility model relates to the technical field of barite powder detection, in particular to a barite powder detection recorder device which comprises a bottom plate and further comprises vertical plates fixed to the two sides of the top of the bottom plate, supporting plates are arranged in the vertical plates, and alcohol lamps are arranged at the tops of the supporting plates; the first motor is arranged on the right side of the right vertical plate, an output shaft of the first motor is in bolted connection with a two-way screw rod, the other end of the two-way screw rod is rotationally connected with one side of the vertical plate, the two sides of the surface of the two-way screw rod are in threaded connection with movable blocks, and supporting rods are hinged between the front side and the rear side of each movable block and the bottom of the corresponding supporting plate; the fixed plate is fixed to the top of the vertical plate, a movable disc is movably connected to the interior of the fixed plate, a limiting disc is fixedly connected to the bottom of the movable disc, and the surface of the limiting disc is movably connected with the inner wall of the fixed plate; according to the utility model, the crucible can be driven to swing back and forth and left and right in a reciprocating manner, so that the interior of the crucible can be conveniently and uniformly heated.

This application provides a mineral processing method for recovering rare earth elements, fluorite, and barite from carbonate rare earth ores, belonging to the field of comprehensive mineral resource utilization technology. This application utilizes a process flow involving mixed flotation of fluorite-rare earth elements and barite, flotation of fluorite-partially rare earth elements and barite, strong magnetic gravity separation of fluorite-remaining rare earth elements, and strong magnetic gravity separation of a small portion of rare earth elements and barite. This not only efficiently recovers rare earth elements, fluorite, and barite, avoiding the waste of associated resources, but also simplifies the operation process, makes the process more stable, and significantly reduces mineral processing costs.

The invention relates to the decontamination of radiation-contaminated lands with clay and loose soil, such as agricultural lands, as well as abandoned test sites, such as the Semipalatinsk test site and uranium quarries. In the method for decontaminating radioactively contaminated lands, which includes the introduction of a reagent, according to the invention, the area of ​​the land to be treated is filled with a 5-7 cm thick layer of KB3 grade barite concentrate containing at least 90% barium sulfate, or finely crushed barite-lead ore containing 70% barium sulfate and up to 1% lead sulfate, Then the land is ploughed using a heavy eight-body plow to a depth of at least 300 mm, turning over the soil layer and dumping it in an inverted position for the complete burial of the radioactively contaminated mass, after which the land is harrowed and reclaimed with the sowing of grass seeds. The developed method for decontaminating radioactively contaminated lands makes it possible to decontaminate lands over a large area and eliminates the need to extract fragments containing adsorbed radionuclides from the soil.

The utility model relates to the technical field of vibrating feeders, and discloses a vibrating feeder with a baffle, which comprises a vibrating feeder frame body, a vibrating motor is arranged on the left surface of the vibrating feeder frame body, and a mounting plate is fixedly mounted on the lower surface of the vibrating feeder frame body. Mounting boxes are fixedly mounted at the left end and the right end of the upper surface of the mounting plate, the right surfaces of the two mounting boxes are open, the limiting mechanism is arranged on the vibration feeding rack body, and the driving motor rotates to drive the two L-shaped connecting plates to move up and down, so that the T-shaped baffle moves synchronously, the T-shaped baffle is adjusted, and the vibration feeding efficiency is improved. According to the vibrating feeder, the T-shaped baffle is arranged on the vibrating feeder frame body, large barite powder is blocked by the T-shaped baffle, small barite powder mixed with the large barite powder leaves the interior of the vibrating feeder frame body through the lower portion of the T-shaped baffle and the rectangular grooves, the barite powder is finely graded, and therefore the working efficiency of the vibrating feeder is improved.

Drilling fluid compositions may include a weighting agent, a nitrite-containing compound, and an ammonium-containing compound, where the nitrite-containing compound and the ammonium-containing compound may be encapsulated together in copolymer micro-particles forming encapsulated thermochemical compounds, and where at least one property selected from the group consisting of the density, the plastic viscosity, the yield point, the gel strength, and the pH, of the drilling fluid composition may be substantially similar to the at least one property of a comparable drilling fluid composition devoid of the encapsulated thermochemical compounds. Methods for reducing a filter cake from a wellbore surface in a subterranean formation are also provided. The methods may include introducing into the wellbore the drilling fluid compositions, allowing the drilling fluid composition to reach a temperature in the wellbore sufficient for the encapsulated thermochemical compounds to react, where the reaction of the encapsulated thermochemical compounds generates heat and nitrogen gas.

The invention discloses an environment-friendly and safe barite impurity removal acid boiling technology, and belongs to the technical field of barite impurity removal, and the technology comprises the following steps: 1, barite raw material pretreatment: barite grinding and crushing, microwave treatment, low-temperature freezing and salt washing treatment; 2, spraying an environment-friendly anti-corrosion coating on the inner surface of the acid cooking pool; 3, the pretreated barite raw materials are added into an acid cooking pool in two layers, after the lower-layer barite raw materials are added, the lower-layer barite raw materials are evenly poured with sulfuric acid, then the upper-layer barite raw materials are added, and then the surface layers of the upper-layer barite raw materials are evenly poured with sulfuric acid; 4, after barite enters the pool, the opening of the acid cooking pool is covered with a polyethylene film; step five, performing acid cooking for 5-6h; and 6, filtering, deacidifying, washing and drying the acid-boiled material to obtain the purified barite. By optimizing the acid boiling process, the purity of the purified barite is higher than 98%.

The application provides a heavy medium separation method for phosphate ore, fluorite ore, barite ore and polymetallic ore, which comprises the following steps: separating the ore corresponding to the real-time operation state data of the ore through a preset gradient density heavy medium separation system; the gradient density heavy medium separation system has a partition independent medium recovery module and a suspension liquid density intelligent control module; and the separation density characteristics are obtained through the partition independent medium recovery module and the suspension liquid density intelligent control module. The application can realize the accurate separation of polymetallic associated ore, obtain various products such as phosphate concentrate, fluorite concentrate and barite concentrate, and improve the resource utilization rate. In addition, the anti-mud interference control algorithm is generated through a medium non-magnetic substance content accumulation prediction model, which effectively deals with the separation challenge of ore with different mud content and grade, and ensures the stability and separation precision of the system under complex working conditions.

The application relates to an industrial-vision-based barite ore sorting and distributing device and a sorting machine, and belongs to the technical field of ore sorting. The device comprises a supporting frame and a conveying belt assembled in the supporting frame. A high-precision visual detector, a dynamic hot film mechanism and a high-speed visual sensor are sequentially arranged on one side of the supporting frame from bottom to top. The optimized design of the dynamic hot film mechanism realizes efficient water and dirt removal of wet and sticky ores. Two groups of ultrasonic transducers are arranged on the upper and lower sides of the hot air cavity, the vibration direction of the ultrasonic transducers is at a specific angle with the axis of the hot air flow, and the forced air flow formed by the built-in heating rod and the high-pressure vortex fan can make the ultrasonic vibration and the hot air flow act on the ore surface in cooperation, so that the surface moisture can be quickly evaporated through heating, and stubbornly adhered impurities can be peeled off with the help of ultrasonic vibration. Meanwhile, the dustproof net at the output end of the air outlet bin can prevent the backflow of impurities, guarantee the cleanliness of the ore surface after pretreatment, and provide a clear detection object for optical detection.

The invention provides a barite powder-based drilling fluid underground crack plugging effect three-dimensional CT image evaluation method, and belongs to the field of petroleum engineering, and the method comprises the steps: obtaining a three-dimensional CT image of a crack-matrix core model; a microscopic crack topological structure in the three-dimensional CT image is recognized, and a sealing agent material and barite powder-based drilling fluid are added; quantitatively evaluating the micro-crack filling effect based on the crack-matrix rock core model, enabling matrix pores to be equivalent to micro-cracks in the rock, and counting the micro-crack porosity of each layer; a three-dimensional reconstruction evaluation model is constructed, the plugging effect is analyzed, the error rate of the average porosity in a two-dimensional image and the porosity of three-dimensional core model crack filling reconstruction is calculated, and by establishing a complete evaluation technology system, the accuracy of crack plugging effect evaluation is improved, and accurate characterization of a complex crack network is achieved; a processing method for enabling matrix pores to be equivalent to micro cracks in the rock is innovatively provided, and multi-scale integrated analysis is achieved.

The application discloses a preparation method of a low-interference bactericide filler, and the low-interference bactericide filler is prepared from high-purity barite and non-asbestos high-purity white talc ore as raw materials through wet ball milling and airflow milling to obtain superfine barium sulfate and talc powder raw powder with specific particle sizes; the talc powder raw powder is pretreated by urea gas phase intercalation, the barium sulfate is activated by glacial acetic acid gas phase, and then the two are compounded according to a ratio of 6-9:4-1, surface modification is carried out through multi-step spray addition of a compounding modifier, and finally, the finished product is obtained through demagnetization and sieving. The 24h BIT bactericide adsorption rate of the filler is less than 10%, the bactericide decay rate can be greatly reduced when the filler is applied to water-based paint, the mildew resistance, scrub resistance and sedimentation resistance of a paint film are improved, the industry pain point that the bactericide efficiency is interfered by traditional fillers is solved, and the low-interference and performance enhancement effects of the paint are combined.

The invention discloses a copper-based powder metallurgy friction material containing composite iron powder and a preparation method of the copper-based powder metallurgy friction material. The friction material is prepared from, by weight, 45%-60% of electrolytic copper powder, 10%-20% of the composite iron powder, 10%-15% of granular graphite, 1%-5% of barite, 3%-6% of tungsten oxide, 2%-4% of high-carbon ferrochrome, 2%-4% of silicon dioxide and 1%-2% of porous zirconium carbide ceramic. Compared with the prior art, the friction material has the positive effects that the iron powder prepared by two different processes is added into the friction material, and optimal granularity matching is carried out, so that the strength and the hardness of the material are improved, and meanwhile, the noise generated in the braking process is effectively reduced. According to the invention, the porous zirconium carbide ceramic is added into the friction material, so that the heat resistance of a brake pad can be improved, the stability of a friction coefficient is ensured, and vibration and noise during braking are reduced.

The application discloses a method for determining the position of drilling fluid leakage and calculating leakage parameters, which is used for finding the position of well leakage during drilling, calculating the leakage speed and leakage amount of drilling fluid, and estimating the leakage scale. The application describes the principle that the photoelectric absorption cross section Pe value of barite contained in the drilling fluid is abnormally high compared with other rocks, minerals and fluids, and the leakage position is accurately positioned by the characteristics of the high value of the Pe curve measured by the lithology density logging in the leakage well section, and the leakage speed is predicted by the correlation between the Pe logging value and the instantaneous leakage speed, and the leakage amount is calculated by combining the method of multi-mineral analysis with the actual content of barite in the drilling fluid. The method is simple and easy to operate, and the accuracy is reliable. Compared with the data provided by the field, the error of the leakage speed and the leakage amount calculated by the method is small, and the effect is good.

The utility model relates to a vibrating screen feeding adjusting device for barite powder production, which comprises a vibrating screen shell communicated with a feeding pipe. The feeding pipe is a rectangular pipe, the movable plates are symmetrically arranged in the left portion and the right portion of the feeding pipe, the upper end of the movable plate on the left side is hinged to the upper end of the inner wall of the left side of the feeding pipe, and the lower ends of the two movable plates are close to or away from each other; the control piece comprises rotating rods and top plates, the rotating rods are rotationally arranged on the lower side of each movable plate, the top plates are connected to the upper ends of the peripheral walls of the two rotating rods, and the free end of the left top plate is in sliding contact with the left side face of the left movable plate; a driving piece for driving the two rotating rods to rotate oppositely or oppositely is arranged on the feeding pipe, and the two rotating rods rotate oppositely so as to drive the lower ends of the two movable plates to be close to each other and make contact with each other. The utility model solves the problem that the size of the feed port of the vibrating screen is difficult to adjust when the vibrating screen is used for screening barite powder granules.