12 results about "Dolostone" patented technology

The application provides a compact dolomite reservoir composite acid fracturing process parameter evaluation system and method, which comprises a simulated fracture device, an acid injection device and a circulating water injection device. The acid injection device comprises an acid storage container, an acid injection pipeline and an acid discharge pipeline. The acid injection pipeline is connected to the acid storage container and the acid injection liquid inlet hole of the simulated fracture device at both ends. The acid discharge pipeline is connected to the acid injection liquid outlet hole of the simulated fracture device. The circulating water injection device comprises a water storage container, a water inlet pipeline and a circulating water discharge pipeline. The water inlet pipeline is connected to the water storage container and the water injection liquid inlet hole of the simulated fracture device at both ends. The circulating water discharge pipeline is connected to the water injection liquid outlet hole of the simulated fracture device and the water storage container at both ends. The application adopts reverse thinking to evaluate the composite acid fracturing process parameters such as the preflush / acid viscosity ratio, the pump injection displacement and the alternating series by taking the fractal dimension, the acid volume, the flow conductivity and the acid fluid loss as the targets, and is more specific and systematic.

This invention discloses a method for preparing lightweight calcium carbonate from dolomite, comprising the following steps: crushing, grinding, and calcining raw dolomite to obtain lightly calcined dolomite powder; subjecting the lightly calcined dolomite powder to acid leaching to obtain an acid leaching solution; adjusting the pH of the acid leaching solution to 12.3-12.6 with alkali, then introducing carbon dioxide to bring the pH to 7.6-8.4, followed by solid-liquid separation to obtain lightweight calcium carbonate. This invention, through calcination, acid leaching, and carbonation of dolomite, produces lightweight calcium carbonate that not only meets the requirements for precipitated calcium carbonate for plastics in the standard "General Industrial Depositional Calcium Carbonate," but also meets the requirements for calcium carbonate for rubber, coatings, and papermaking, thus possessing significant application value and broad prospects.

The present application belongs to the technical field of sanding ground grouting regulation, and relates to a dolomite sanding stratum tunnel high-pressure curtain grouting regulation method and system. The present application generates a sanding rate grade map and a splitting early warning signal, overcomes the ambiguity and uncertainty of single sensing information in identifying complex geological conditions, and improves the accuracy of stratum state perception. A dynamic linkage mechanism between stratum state, risk early warning, and slurry parameters and grouting parameters is established, slurry proportioning and grouting pressure are automatically and differentially regulated according to the sanding grade, the best matching of slurry properties and stratum demand and the dynamic balance of safety and efficiency are realized, the curtain formation is mastered in real time through real-time imaging and closed-loop feedback regulation of grouting effect, the construction scheme is continuously optimized according to objective data, the uniformity, continuity and overall quality of the dolomite sanding stratum tunnel high-pressure curtain grouting are ensured, and material waste and construction delay are avoided.

The present invention relates to the field of geological exploration, and provides a quantitative prediction method and a quantitative prediction system for dolomite. The method comprises: performing diagenetic mechanism identification on dolomite on the basis of multidisciplinary data analysis to determine a target region where the dolomite is present; performing multiscale characterization on a fault system in the target region to determine a multiscale fracture development plane of a target interval; establishing a one-dimensional dolomite quantitative model on a single-well control point on the basis of a multimineral model and a plurality of well logging curves, and determining a dolomite content curve of the single-well control point; and establishing a three-dimensional quantitative model of the dolomite on the basis of the one-dimensional dolomite quantitative model of a plurality of single-well control points and the multiscale fracture development plane of the target interval to perform quantitative prediction on the dolomite. In the present invention, the development characteristics and a distribution range of dolomite in a fault and a fracture development zone can be identified, and the content of the dolomite can be quantitatively analyzed, providing data support for subsequent prediction of heterogeneous reservoirs and high-permeability strips.

The application belongs to the technical field of roof reinforcement and support in underground mining, and discloses a bauxite soft roof advanced grouting solidification method. The method first acquires direct roof and indirect old roof information, determines the soft direct roof to be solidified, and takes the lithological interface between the soft direct roof and the indirect old roof of dolomite as the bottom control interface of the grouting hole. Then, the advanced grouting hole is arranged according to the working conditions such as mining and cutting roadway excavation, room and pillar mining or room and pillar subsequent filling, and the grouting solidification is carried out by using silicate modified polyurethane two-component material. Finally, the solidification quality is verified by coring, acoustic wave and on-site monitoring, and the roof protection mining and excavation operation is cancelled after the index is met, so that the roof stability and resource recovery rate are improved.

The application provides a cement raw material prepared from stone slag and stone powder and a method for preparing cement clinker by using the same. The cement raw material is composed of the following raw materials in percentage by weight: limestone 70-80%, stone slag and stone powder 10-15%, iron ore dressing powder 8-11%, and coal-fired furnace slag 2-4%. The method for preparing cement clinker comprises the following steps: mixing the raw materials in proportion, grinding the mixture to obtain the cement raw material, and storing the raw material in a homogenizing warehouse; feeding the raw material powder into a preheater by a conveying device for pre-decomposition to obtain semi-clinker; and feeding the semi-clinker into a rotary kiln, performing high-temperature calcination in the rotary kiln, and then feeding the semi-clinker into a grate cooler for rapid cooling to obtain the cement clinker. The application uses dolomite stone slag and stone powder as the cement raw material, which can reduce the cost of cement production, ensure the quality of the clinker, and is beneficial to the comprehensive utilization of mineral resources and the extension of the service life of the mine.

This invention discloses a simulation test device for dewatering using advanced drainage pipes in water-rich sandy dolomite tunnels. The device includes a test chamber with a tunnel simulation block on it. The tunnel simulation block has a simulated tunnel excavation opening, and an advanced drainage pipe is inserted into the simulated tunnel excavation opening and into the tunnel simulation block. A pressurized water tank is fixed above the test chamber, and the pressurized water tank contains several pressure zones filled with crushed stone. A variable pressure plate is installed inside the pressurized water tank, which can individually change the water pressure within each of the crushed stone pressure zones. This invention simulates localized pressure difference changes during dewatering using advanced drainage pipes in water-rich sandy dolomite tunnels by controlling multi-point pressure differences, thus adapting to simulate extreme situations that may occur during dewatering using advanced drainage pipes in more water-rich sandy dolomite tunnels.

This invention relates to the field of rock point load strength testing technology, specifically to a sandy dolomite anti-fragmentation splash point load testing instrument, comprising a base, a rotating plate, and a support frame. The rotating plate is rotatably mounted on the base via an angle adjustment mechanism, and a loading mechanism is fixedly connected to the rotating plate. The support frame is fixedly connected to the base, and an upper pressure head is fixedly connected to the support frame. The advantages of this invention are: workers can complete the test without holding the sample, avoiding hand injuries, freeing up workers' hands for other operations, effectively preventing debris from flying outwards when the sample breaks, avoiding injury to workers, eliminating safety hazards during the test, and allowing sample debris that would normally splash outwards to fall downwards through the protective plate for easy collection by workers, ensuring the integrity of the broken sample and facilitating comparative analysis.

This invention discloses a method for preparing needle-like aragonite whiskers using natural dolomite as raw material, belonging to the field of inorganic non-metallic material preparation technology. The method for preparing needle-like aragonite whiskers using natural dolomite as raw material includes the following preparation steps: S1. Pre-treating natural dolomite ore to obtain natural dolomite ore powder; S2. Preparing the natural dolomite ore powder into a suspension; S3. Mixing the suspension with magnesium chloride hexahydrate to adjust the system; then adding a composite alkali activator and mixing again to obtain a mixture; S4. Performing a constant-temperature stirring reaction on the mixture to obtain a reactant; sequentially subjecting the reactant to solid-liquid separation, washing, drying, and depolymerization to obtain a product rich in needle-like aragonite whiskers. This invention features a simple process flow, eliminates the need for complex ion separation steps, has low energy consumption, conforms to the concepts of green manufacturing and sustainable development, and produces aragonite whiskers with high purity, regular morphology, and good dispersibility.

The present application relates to mineral content detection technical field, specifically a kind of method for determining fluorite in dolomite fluorite ore.This method will be through roasting again adding acetic acid dissolution, adding chromium internal standard solution, after dilution with dilute acid, the mass of calcium oxide in the measured liquid is determined by inductively coupled plasma emission spectrometer, then the mass of calcium fluoride is calculated according to the mass curve of calcium oxide;Another sample is added with chromium internal standard solution, tartaric acid, boric acid, hydrochloric acid to prepare the measured liquid by heating dissolution;The fluorite content is calculated by difference method again.The present application is roasting, dolomite is easily dissolved in acetic acid, avoids the positive interference caused by incomplete decomposition;At the same time, the present application has the advantages of simple operation, fast analysis speed, high accuracy and accuracy, wide content range of fluorite that can be determined, etc., and is convenient for popularization and application.

The application provides a tidal flat facies dolostone reservoir logging while drilling evaluation method, the method comprises the following steps: determining the marker layer on the upper part of the high-quality reservoir by using Ca, Mg and other elements according to element logging analysis, qualitatively identifying the reservoir by engineering logging parameters, obtaining the dissolution pore characteristics by scanning the rock debris backscattering imaging, calculating the elastic modulus of the rock by elements, finally forming the tidal flat facies dolostone logging while drilling evaluation method, which can provide the basis for trajectory optimization in the drilling construction process of the tidal flat facies dolostone formation, guide the drilling construction and improve the drilling rate of the high-quality reservoir.