119 results about "Mineralogical composition" patented technology

The invention relates to a preparation method for red mud-based iron-series catalyst and application of the red mud-based iron-series catalyst in hydrogen production through cracking of methane. The preparation method is characterized in that alumina industrial waste, i.e., red mud, is used as a raw material and undergoes acid dissolution treatment, then a certain amount of iron is added into the treated red mud by using a homogeneous coprecipitation method and then drying, calcining and hydrogen reduction are successively carried out so as to obtain the red mud-based iron-series catalyst. The red mud-based iron-series catalyst has a more prosperous pore structure and higher content of active metal iron compared with red mud, the particle size of the catalyst is uniform, and the dispersity of metallic iron is good. The method has the following advantages: mineral components with catalytic and catalysis-assisting functions in red mud are given to full play; the pore structure of red mud is improved; introduction of iron enables the content of the active component of the catalyst to be increased, and activity and stability of red mud in catalytic cracking of methane for hydrogen production are substantially improved; and preparation cost for the catalyst for hydrogen production through cracking of methane is reduced, and an approach for resourceful and comprehensive utilization of red mud is created.

The invention discloses a shale classification method. The method includes the first step of determining the types of macroscopic structures of shales by observing shale cores, the second step of determining organic matter types and total content of organic carbon through kerogen and organic carbon analysis and obtaining the volume fraction of organic matter components through the total content of organic carbon, a conversion coefficient, the organic matter density and the rock density, the third step of determining mineral composition of the shales and obtaining the volume fraction of calcareous mineral components, the volume fraction of felsic mineral components and the volume fraction of clay mineral components through thin section authentication and total rock mineral analysis, the fourth step of classifying the shales according to the four-component three-end-member principle, and the last step of classifying the shales and conducting reasonable simplification through a core macroscopic structure and rock type combined method. The shale classification method is applicable to laboratory studies and outside work, is a method with reasonable logic and high operability for classification of the shales, solves the problems that the shale classification methods are varied and the organic matter components are ignored, and can be used for studying formation causes of the shales conveniently and guiding field logging and fracturing transformation.

Methods of combining mineral composition and laboratory test results for reservoir rock samples to predict future responses to secondary and tertiary oil recovery treatments are disclosed. Particular, SEM and EDS will be combined to produce a mineral map, including mineral distribution around the rock's pore space, for comparison with laboratory data to predict and/or interpret how certain mineral distributions will respond to various fluid-rock interactions.

The automatic main mineral identifying and quantitatively detecting method for high alkalinity sintered ore belongs to the field of metallurgical technology. The method includes four parts of preparing sintered ore sample, X ray diffraction condition for quantitative analysis, standard diffraction curve database of high alkalinity sintered ore minerals, and sectional optimizing fitting and computer software. The method of the present invention makes it possible to identify the minerals in high alkalinity sintered ore and measure the content fast automatically. In addition, the present invention has less sampling error and no visual error.

The invention provides a belite-calcium sulphoaluminate-ferrite (BCSAF) cement composition comprising: a BCSAF clinker which clinker has the following mineralogical composition, based on the total weight of the clinker: 5 to 25%, preferably 10 to 20%, of a calcium aluminoferrite phase having the general formula C2AxF(1-X), wherein X is from 0.2 to 0.8; 15 to 35% of a calcium sulphoaluminate phase; 40 to 75% of belite (C2S); from 0.01 to 10% in total of one or more minor phases selected from calcium sulphates, alkali metal sulphates, perovskite, calcium aluminates, gehlenite, free lime and periclase and/or a vitreous phase; and an alkanolamine.

Ash produced by many coal-fired utilities has little or no commercial value as a cement additive or as a component in building materials because of its chemical or mineralogical composition. This condition is especially common with ash materials produced by Fluidized Bed Combustion boilers (FBC) or Circulating Fluidized Bed Combustion boilers (CFBC) fired with bituminous coal or waste coals (gob) reclaimed from inactive coal mine sites. The present invention describes a novel process that converts otherwise low-value materials such as bottom and fly ashes produced by a FBC or CFBC boilers, for example, into materials that have desirable physical, chemical and mineralogical compositions that can be used as a valuable cement additive or component in building materials. The novel process closely integrates the boiler (steam generator) that produces the ash with a new high-temperature process, such as a kiln. The ash is mixed with limestone or other bulk materials to provide a feed for the kiln of the desired chemical composition. The mixture is treated at elevated temperatures in the kiln to produce a product, that in combination with further processing, exhibits desirable pozzolanic properties. Integrating boiler and kiln operations provides economic and environmental benefits. Waste heat produced by the kiln that would otherwise be released into the atmosphere is made available to the steam or turbine cycle, thus improving the overall boiler heat rate. Effluents and gases produced by the kiln may be efficiently treated by the boiler environmental control systems or independent environmental control systems. Novel production methods and feed materials will be claimed.

The invention relates to a formula of for producing sintered bricks from iron tailings. The formula is applicable to the production of sintered bricks by taking fine-grain iron tailings as a main raw material. According to the formula, the iron tailings (or other metallic and nonmetallic tailings) which are subjected to concentrating and dewatering are mixed with a certain ratio of coal slurry so as to form raw materials, the content of SiO2 in the mixture is enabled to be higher than 50%, the content of Al2O3 in the mixture is enabled to be higher than 6%, the content of CaO in the mixture is enabled to be lower than 6%, the content of MgO in the mixture is enabled to be lower than 6%, the calorific value is controlled to be 1.465MJ/Kg to 1.780 MJ/Kg, and thus the requirements on green brick sintering are met. The formula has the effects that the mixture overcomes the defects of the iron tailings and the coal slurry separately served as raw materials of the sintered bricks, the mineral composition and physical properties of the raw materials are optimized, the comprehensive utilization of fine-grain tailings of mines is realized, and the reduction of the cost of the sintered bricks is facilitated.

The invention relates to the technical field of the treatment of polluted soil, in particular to a sepiolite-containing curing agent for treating heavy metal pollution soil. The curing agent comprises the following components in percentage by weight: 25 to 40 percent of cement, 40 to 65 percent of sepiolite and 10 to 20 percent of quicklime. The curing agent has the advantages that: the risk of secondary pollution is not caused and the property of the original soil is not changed remarkably when heavy metal ions are fixed by the sepiolite; and the mineral composition of the sepiolite is very close to that of the original powder clay, so that the cement and the quicklime are prevented from damaging a soil structure greatly. Due to the advantage, the curing agent remarkably recovers an agricultural land polluted by a heavy metal areal source and has good social, economic and environmental benefits.

A method for preparing a zirconia/mullite whisker composite material by crushing, batching, co-grinding with high-energy ball milling, compacting and heat treatment using natural bauxite and zircon minerals as raw materials; the method prepares In the composite material structure, the average diameter of the mullite whiskers is 1.5-3 μm, the aspect ratio is 8-10, and the zirconia is evenly distributed in the network structure formed by the mullite whiskers in an irregular granular shape. The invention fully utilizes the chemical and mineral composition characteristics of natural bauxite and zircon minerals, and has the characteristics of low raw material cost, simple preparation process and environmental friendliness.

The invention relates to the technical field of control of contaminated soil, in particular to a diatomite-containing curing agent for controlling heavy-metal-contaminated soil. The curing agent has the following materials by weight percent: 25-40 percent of cement, 40-65 percent of diatomite and 10-20 percent of calcined lime. The invention has the advantages of having no risk of secondary pollution while the diatomite fixes the heavy metal ions and having no obvious change for the properties of natural soil. The composition of minerals of the diatomite is very close to that of undisturbed silty clay, so that larger damage caused by the cement and the calcined lime to a soil body structure is avoided. Due to the advantage, the curing agent has very obvious effect for restoring agricultural lands contaminated by heavy metal surface sources, and has good social, economic and environmental benefits.

A method for treating a raw steel plant slag to transform it into a hydraulic binder at least equivalent to a Portland cement clinker, comprises the following steps: oxidizing treatment with input of oxygen, air or a mixture thereof at a pressure ranging between 1 to 15 bars, at a temperature ranging between 1650 and 1400° C., of raw steel slag containing, relative to the raw slag total weight, at least 45 wt. % of CaO and less than 30 wt. % of Fe₂O₃; and adding to the slag a lime source optionally with silica and/or alumina, so that the slag, after tranformation and at room temperature, has a propotion of Fe₂O₃ of less than 13 wt. % and a mineralogical composition comprising at least 40 wt. % in C₃S mineralogical phase and more than 10 wt. %, of calcium ferrite, relative to the final slag total weight.

The embodiment of the invention discloses a method and a system for analyzing mineral composition of dense sandstone. The method comprises the following steps: acquiring a mineral sample; pretreating the mineral sample; performing point-by-point energy spectrum analysis on the pretreated mineral sample by using a scanning electron microscope to obtain a scanning electron microscope gray image and a corresponding energy spectrum data volume, comparing the energy spectrum data volume with a standard mineral database, and determining mineral plane distribution characteristics of the gray image; performing micron CT scanning on the pretreated mineral sample, and acquiring a gray slice of a scanning result; comparing gray image with the gray slice, determining the gray image and a matching image in the gray slice, and according to the matching image and the gray image, determining a corresponding relation between a mineral in the gray slice and a gray value; and according to the corresponding relation, establishing a three-dimensional spatial distribution model of the mineral, and determining occurrence and spatial distribution characteristics of the mineral. Through the method and the system for analyzing the mineral composition of the dense sandstone, provided by the invention, accuracy and intuition of mineral composition analysis can be improved.

The invention relates to an energy dispersion X-ray spectrum-based analysis method for phases of fly ash. The method comprises the following concrete steps: (1) analyzing chemical composition of the fly ash through a chemical process or X-ray spectrofluorimetry; (2) analyzing mineral composition of the fly ash through X-ray diffraction; (3) determining the kinds of elements requiring acquisition of images of power spectrum surface distribution; (4) acquiring backscattered electron images and element power spectrum surface distribution images of the fly ash and carrying out power spectrum point analysis on main phases; and (5) designing a phase analysis method, comprehensively processing the power spectrum surface distribution images of every elements in a same area and then removing noise in analysis results so as to obtain phase-split pseudo-color images and phase analysis results of the fly ash. The phase analysis method provided by the invention is effective to both crystalline and amorphous phases and sensitive to low-content phases. The method can be used for analyzing the kinds of phases composing the fly ash, calculating the volume percentage contents of the phases and observing spatial distribution of the phases.

The invention discloses a method for determining an improved shale brittleness index based on mineral composition. The method comprises the steps of: identifying a kerogen type in to-be-tested shale through a kerogen mirror, and determining a total content Wo of organic carbon in the shale by organic carbon analysis; calculating a volume fraction Vo of an organic matter, and then figuring out a volume content Voganic of the organic matter; and determining the content Wflesic of femic minerals, the content Wcarbanate of carbonate minerals, the content Wclay of clay minerals and a total sum Vimof inorganic minerals in the shale through X-ray diffraction total rock mineral analysis, performing normalization processing to obtain the volume content Vcarbonate of the carbonate minerals, the volume content Vflicec of the femic minerals and the volume content Vcarbonate of the clay minerals, and calculating the improved shale brittleness index Brit based on mineral composition. By adopting the method, the dual effect of the carbonate minerals on the compressibility of the shale can not only reflected, and the accuracy of the shale brittleness index is also improved.

The invention relates to the field of preparation processes of sanitary ceramics, in particular to a formula and a preparation method of sanitary ceramics, which improve the refractoriness of a greenbody and reduce the deformation degree of the green body by adjusting the raw material composition of the formula and optimizing the chemical composition. In the mineral composition of a common feldspar porcelain body, a proper amount of wollastonite raw material is introduced, the content of an anorthite crystalline phase is increased on the basis of original mullite and quartz crystalline phases, and a proper amount of closed independent pores are formed, so that the shrinkage rate and the volume density are reduced; by introducing a proper amount of the borocalcite flux, an (O = B-O-B = O)structure can be provided, the integrity and compactness of a network structure around the pores of the borocalcite flux are ensured, and the sizes of the independent pores are controlled within a certain range so as to avoid reduction of the firing strength.

An evaluation method for brittleness of shale includes the following steps: (1) obtaining shale cuttings returned from a target shale gas well bottom, and separately performing microscopic nanoindentation, X-ray diffraction and density tests; (2) based on obtained data of the microscopic nanoindentation, X-ray diffraction and density tests, separately calculating an elastic modulus, a component content and rock debris sample density constituted by various types of mineral substances of each of the shale cuttings; and (3) substituting the elastic modulus, mineral component content and a shale cuttings density value constituted by the various types of mineral substances of each of the shale cuttings into a brittleness evaluation model formula, wherein Wi represents a content of an i mineralcomponent in the shale; Ei represents the elastic modulus of i mineral composition in the shale, GPa; [rho] represents shale density, g/cm3, and a B value obtained by the model reflects a brittlenesscharacteristic of a shale reservoir where the shale is located. The method can perform real-time evaluation on the brittleness of the shale simply, quickly and at low cost.

The invention relates to a magnetizing roasting method for complex refractory mixed type iron ore. By means of the method, according to the mineral composition of the mixed type iron ore, weakly magnetic iron ore in the mixed type iron ore is converted into strong magnetic iron ore in the manner of mixing the mixed type iron ore high in siderite content with the mixed type iron ore low in siderite content or containing no siderite according to a certain ratio for compound magnetizing roasting, and iron ore concentrate high in iron grade and iron recycling index can be obtained from roasted ore through a conventional weakly magnetic separation process. The magnetizing roasting method can be suitable for coal-based reduction processes of tunnel kilns, rotary kilns and the like, no or a small quantity of reducing agent can be prepared in a roasted object in the magnetizing roasting technological process, and therefore the energy consumption of the roasting process is lowered.

A method for estimating a fracability index for a geological location includes determining a fabric metric and a mineralogical composition metric for a geological sample extracted from a geological location and estimating a fracability index for the geological location from the fabric metric and the mineralogical composition metric. The fabric metric may be a grain related measurement such as grain size or angularity, or a pore-space related measurement such as pore area, diameter, aspect ratio, and circumference, or statistics associated with such measurements. In certain embodiments, determining the mineralogical composition metric includes detecting a prevalence of at least one organic proxy within the geological sample such as vanadium, iron, uranium, thorium, copper, sulfur, zinc, chromium, nickel, cobalt, lead and molybdenum. Determining the mineralogical composition metric may also include detecting a prevalence of one, two, or all of siliciclastics, carbonate and clay.

The invention provides a recognition method of supracrustal rock pore filler. The recognition method of the supracrustal rock pore filler includes the steps that full-spectrum-plane analysis is performed on a field of vision, comprising the pore filler, on a surface to be measured of a rock sample to be measured, and an element composition energy spectrum diagram in the field of vision is obtained; energy-spectrum-plane scanning analysis is performed on elements contained in the element composition energy spectrum diagram in the field of vision so that plane distribution characteristic diagrams of all the elements can be obtained; according to the plane distribution characteristic diagrams of all the elements, the mineral species and distribution characteristics of the pore filler of the rock sample to be measured are recognized. By means of the recognition method, the mineral composition and distribution characteristics of the supracrustal rock pore filler can be accurately recognized.

A method for determining the macroscopic modulus of shale through a fine/micro mechanical test comprises the following steps: obtaining a macroscopic test result through a uniaxial compression test, and sequentially carrying out nanoindentation test and atomic force microscope test on a rock slice to obtain the Young modulus of a sample under the microscopic scale and the microscopic scale, and carrying out coupling analysis on the obtained data and carrying out macro-scale upgrading. Herein, results of the nanoindentation and the atomic force microscope are first analyzed to determine the fine/microscale modulus of the shale; and then, based on MLA result, the mineral compositions is classified according to modulus difference, and t mechanihecal parameters under a microscopic scale and a microscopic scale are updated by adopting a Mori-Tanaka homogenization method so as to determine the macroscopic modulus of the shale. The method can be used for rapidly predicting the mechanical parameters such as the elastic modulus and the hardness of the material, the rock debris can be used for performing MLA, AFM and nanoindentation tests in the drilling process to obtain macroscopic mechanical parameters, the test cost is reduced, and the test period is greatly shortened.