414 results about "Clay minerals" patented technology

Processes for extracting lithium from a clay mineral and compositions thereof are described. The extraction process includes providing a clay mineral comprising lithium, mixing a cation source with the clay mineral, performing a high-energy mill of the clay mineral, and performing a liquid leach to obtain a lithium rich leach solution.

The invention provides a dump leaching method for improving the leaching rate of gold ore, and belongs to the technical field of mineral processing. The method comprises the following steps: firstly, separating minerals into oversize products and undersize products; mixing sodium carboxymethyl cellulose, bentonite and ferrous sulfate to obtain a mixture, and granulating the undersize product by using the mixture as a binder; and mixing the undersize product particles with the oversize product, and carrying out cyanide-free dump leaching. According to the method, through graded granulation and heap building, the problem that heap building permeability is poor due to the fact that the gold ore contains many clay minerals is solved. In the granulation stage, ferrous hydroxide colloid generated by hydrolysis of ferrous sulfate in the binder can assist ore particle agglomeration, and particle stability is enhanced; during subsequent cyanide-free dump leaching, ferrous sulfate can be used as an auxiliary reducing agent and a catalyst in a thiourea gold leaching system to promote oxidation and dissolution of gold; meanwhile, ferrous ions can adjust the oxidation-reduction potential of a system, so that the thiourea gold leaching reaction is in a more favorable potential interval, the oxidation efficiency of thiourea is improved, invalid decomposition of thiourea is reduced, and therefore the use amount of thiourea and the use amount of agents are reduced.

The invention relates to the technical field of carbon dioxide sequestration and shale gas development, and particularly discloses a shale micro-nano pore multiphase multicomponent competitive adsorption data determination method and device, and the method comprises the steps: obtaining a shale core sample of a target area, and determining the type and relative content change characteristics of surface functional groups of the shale core sample; key structures and force field parameters of shale clay minerals in a target block are collected, and a shale clay mineral molecular model is established; establishing a plurality of fluid molecular models; establishing slit models, and establishing a multiphase fluid system model between the slit models to obtain a stable configuration; applying an external electric field to the stable configuration, and performing molecular dynamics calculation to obtain molecular trajectory coordinates and dynamics information of the multi-phase multi-component fluid; and calculating competitive adsorption data of the shale micro-nano pore multi-phase multi-component fluid under the action of the electric field. According to the scheme, the occurrence state and the competitive adsorption behavior of the shale micro-nano pore multi-phase multi-component fluid under the action of the electric field can be disclosed from the molecular scale.

The invention discloses a method for preparing an adsorbent from clay minerals and carbide slag, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials. According to the method, natural clay and carbide slag serve as raw materials, the composite adsorption material containing various metal active sites is prepared through a solid-phase reaction, and the composite adsorption material is suitable for efficient removal of high-concentration and low-concentration heavy metal ions. The raw materials are cheap and easy to obtain, the preparation process is simple and efficient, and the product has excellent performance, wide application and wide prospects.

The invention discloses a composite heavy metal adsorbent synthesized through mineral conversion and a preparation method of the composite heavy metal adsorbent, and belongs to the technical field of deep processing of natural nonmetallic minerals and preparation of heavy metal adsorption functional materials, and the main preparation method comprises the following steps: S1, crushing and crushing natural clay minerals, and sieving with a 80-mesh sieve to obtain mineral powder; s2, mixing the obtained mineral powder with a calcium compound, and carrying out ball milling; s3, adding a boron compound, and continuing ball milling; s4, adding water into a solid material obtained by ball milling according to a solid-to-liquid ratio of (1: 5)-(1: 20), putting into a microwave hydrothermal reaction kettle, adding an organic auxiliary agent, carrying out gradient heating to 100-200 DEG C, reacting for 30-120 minutes, then naturally cooling to room temperature, separating, drying and crushing; according to the invention, natural clay raw ore is taken as a raw material, and the borate-silicate composite adsorption material is prepared in a preparation mode of combining solid-phase reaction and microwave hydrothermal treatment, so that high-concentration and low-concentration heavy metal ions are efficiently removed.

The present invention discloses a preparation method of a photothermal super-hydrophobic coating with excellent anti-icing / de-icing performance under a low temperature and high relative humidity environment, first by in situ growth of photothermal Cu-MOF nanoparticles on the surface of low thermal conductivity fibrous clay mineral nanoparticles, constructing a two-level nano- / nano-structured composite photothermal particle, which is then subjected to low surface energy modification and introduced into a low thermal conductivity binder, and a binder is induced to phase separate to form a micron-scale binder / low surface energy nanoparticle aggregate by a non-solvent, and finally a photothermal super-hydrophobic coating with a three-level micro- / nano- / nano-structure is constructed by spraying. The three-level micro- / nano- / nano-structure of the coating simultaneously gives the coating excellent photothermal performance and the Cassie-Baxter state stability of the droplet on the coating surface under a low temperature and high relative humidity environment, so that it has excellent passive anti-icing / frosting and active de-icing / defrosting performance in this environment. The low thermal conductivity of the coating further suppresses the heat exchange between the substrate-water droplets, so that the passive anti-icing / frosting performance of the coating is further improved. In addition, the present invention has the advantages of simple preparation method and large-area preparation, laying a solid foundation for the practical application of photothermal superhydrophobic anti-icing coatings.

The invention discloses a construction method and application of a mixed-dimension attapulgite clay-based porous separation membrane, firstly, mixed-dimension attapulgite clay acid etching powder is added into a saponin plant extracting solution to obtain a suspension, then the suspension is mixed with a sodium alginate / glycerol aqueous solution, a Pickering foam template method is adopted to obtain a membrane forming solution, and the membrane forming solution is dried to obtain the mixed-dimension attapulgite clay-based porous separation membrane. And carrying out film casting, calcium crosslinking and carboxylation treatment to obtain the porous separation membrane. On the basis of the rod / sheet mixed dimension structure advantage of clay minerals and the synergistic stabilization effect of plant derivatives, the interfacial film strength, functional group spatial arrangement and network structure are efficiently regulated and controlled, the separation film with a multi-stage communicating pore structure and excellent mechanical performance and separation efficiency is constructed in a green mode, and the separation efficiency is improved by combining film layer stacking and acid pickling enrichment. A high-efficiency uranium separation / enrichment method is developed, and an innovative solution is provided for uranium pollution prevention and control and resource enrichment by a membrane separation technology.

The invention discloses a method for analyzing diagenesis of clay minerals by combining physical simulation and numerical simulation, which comprises the following steps: selecting clay single minerals, and preparing a formation water solution; respectively filling the clay single mineral and the stratum water solution into a plurality of reaction kettles, and carrying out diagenesis physical simulation; establishing a numerical simulation model with the same physical simulation experiment condition, and outputting mineral and ion data; according to mineral and ion data, fitting a physical simulation experiment result and a numerical simulation result, and determining a mineral corrosion rate; and establishing a geologic model by taking the mineral dissolution rate as a reference, and performing clay single mineral diagenesis simulation within a geological time scale. According to the method, numerical simulation parameters are constrained by physical simulation experiment results, and comparison and verification of numerical simulation and physical simulation results are realized by adjusting mineral corrosion kinetic parameters in real time, so that the numerical simulation experiment results are close to actual conditions.

The invention belongs to the technical field of rubber auxiliaries and rubber tracks, and particularly relates to a coupling agent composition for inhibiting rubber appearance flooding and application of the coupling agent composition in the rubber tracks. The coupling agent composition comprises the following components in percentage by weight: 15%-30% of coupling agent, 1%-15% of metal chloride and 70%-85% of clay mineral. Different from a microcapsule technology only aiming at anti-aging agent migration, the coupling agent composition disclosed by the invention can effectively capture various types of color-flooding source substances including carbon black residues, anti-aging agents, antioxidants and the like by starting from common characteristics (containing unsaturated bonds, heteroatoms and aromatic structures) of color-flooding small molecules and through the synergistic effect of the coupling agent and metal ions, so that the color-flooding source substances can be effectively captured. And the method has wide applicability. In addition, a composite system composed of the clay, the coupling agent and the metal chloride can improve the bonding strength of the rubber and a track framework material, and is suitable for being applied to a heavy-load rubber track.

The invention relates to the technical field of adsorbents, in particular to a modified mineral-based composite active coke adsorbent as well as a preparation method and application thereof. The preparation method comprises the following steps: respectively crushing, sieving and drying an active coke raw material and a modified clay mineral, mixing according to a ratio, adding a binder, fully kneading and uniformly mixing, carrying out compression molding, drying, carbonizing and activating to obtain the modified mineral-based composite active coke adsorbent. The modified clay mineral is prepared by dipping a natural clay mineral in a modifier solution, washing, carrying out suction filtration and drying; and the modifier is one or more of acid, transition metal salt, acidic salt or calcium salt. In the preparation process of the active coke material provided by the invention, the modified clay mineral has the effects of improving the yield of an active coke product, enhancing the adsorption performance of the active coke and improving the pore diameter of the active coke; the modified mineral-based composite active coke adsorbent disclosed by the invention has the characteristics of rich pore structure, large adsorption capacity, high efficiency, rich surface functional groups and the like.

The invention relates to the technical field of semi-arid mining area land reclamation and ecological restoration, and discloses a semi-arid mining area reclamation double-surface-soil key layer and a refined construction method thereof.The semi-arid mining area reclamation double-surface-soil key layer comprises a wind-erosion-resistant key layer and a water and fertilizer maintaining key layer which are arranged from top to bottom; the anti-wind-erosion key layer comprises a coarse particle windproof layer and a fine particle cementing layer which are arranged from top to bottom; the water and fertilizer maintenance key layer is prepared from the following raw materials: fine sand or original sandstorm surface soil, a clay mineral-based physical structure regulator, an organic water-retaining agent and a biological enhancement matrix material; the raw materials of the coarse particle windproof layer comprise gravel and coarse sand; the raw materials of the fine particle cementation layer comprise fine sand or original sandstorm surface soil, a clay mineral-based physical structure regulator and an organic water retention capacity cementing agent. The reclamation double-surface soil key layer for the semi-arid mining area can effectively resist natural erosion, improve the soil structure, improve the water and fertilizer retention capability and promote the recovery of local host plants.

The invention relates to a 200-grade sludge fly ash ceramsite composition based on solid waste and a manufacturing method thereof. The 200-grade sludge fly ash ceramsite composition comprises the following components in percentage by weight: 38-50% of shale, 30-40% of sludge and 20-25% of fly ash, wherein the shale is muddy shale which contains more than 40% of the total weight of clay mineral components and is mainly composed of red shale, black shale and green shale and auxiliary materials of kaolin and bentonite; the 200-grade sludge fly ash ceramsite is prepared from solid waste, solid waste resources are fully utilized, the process is simple, and the cost input is low.

The present invention relates to the technical field of sediment or sludge treatment of a water body, and provides a solidification material and a use thereof. The solidification material consists of the following components in percentage by mass: 30% of a sediment flocculant, 20% of a high-strength and high-water-resistant earth consolidator, 30%-40% of calcium bentonite, 5%-15% of a clay mineral, and 5% of an engineering admixture. When the solidification material is used in the sediment or sludge treatment of the water body, pollutants in sediments can be well immobilized, and as tested, no leaching of the pollutants occurs after immersion in the water body. Moreover, the usage amount of the solidification material is significantly reduced compared to that of a conventional solidification material, so that the impact on the storage capacity of the water body can be effectively reduced, and the construction cost is also saved.

The invention discloses a shale gas exploration method, device, equipment and medium, and relates to the technical field of shale gas exploration and development, and the shale gas exploration method comprises the following steps: obtaining respective mass fractions of long quartz minerals, clay minerals and carbonate minerals of a shale reservoir in each well section of a current well, determining the maximum difference degree index, the local onrush characteristic index and the relative change amplitude index of the corresponding mineral content of the shale reservoir in each well section based on each mass fraction, and constructing a comprehensive heterogeneity index representing the shale reservoir in each well section; the porosity, the water saturation and the total gas content of the shale reservoir in each well section are obtained, so that the initial sweet spot grade of each well section is divided; performing grade correction on the initial dessert grade of the corresponding well section according to each comprehensive heterogeneity index to obtain a target dessert grade corresponding to each well section after correction; and determining a well track optimization scheme and a fracturing design scheme based on the target dessert grade so as to carry out corresponding shale gas exploration operation. And accurate shale gas exploration is realized.

The invention discloses a soil improvement method for harmlessly treating phosphogypsum and improving physical structure, which comprises the following steps: uniformly mixing granular red mud, alkaline clay minerals and carbide slag with powdery phosphogypsum raw slag, maintaining the field moisture capacity of the phosphogypsum to be 40-60%, and aging for 3-7 days under natural conditions, the phosphogypsum is subjected to harmless treatment, meanwhile, aggregate formation is promoted, the physical structure of the phosphogypsum is improved, and harmless phosphogypsum matrix soil is obtained; wherein the pH value of the red mud is 10.5-12.8 and the red mud accounts for 1-2% in percentage by mass of the ardealite raw slag powder; the pH value of the alkaline clay mineral is 8.0-10.5, and the alkaline clay mineral accounts for 0.2-1.2%; the proportion of the carbide slag is 0.5-1.5%. After being improved for 3-7 days, the plant can be used for planting pioneer plants such as ryegrass, trifolium repens, festuca arundinacea, cynodon dactylon and elymus dahuricus; especially, slag, bentonite, polyacrylamide, biomass, manure and soil bacterial suspension are also added, so that the physical structure and physicochemical properties of soil are further improved, and soilless ecological restoration of the ardealite storage yard is realized.

The invention provides a lithiated clay mineral PVDF-based composite solid-state electrolyte membrane, a preparation method and application thereof, and a quasi-solid-state battery, and belongs to the technical field of solid-state lithium batteries. The preparation method comprises the following steps: mixing lithium halide, clay minerals and water for the first time, and carrying out ion exchange reaction to obtain lithiated clay minerals; mixing lithiated clay minerals, PVDF, organic lithium salt and an organic solvent for the second time to obtain composite slurry; and applying the composite slurry to the surface of a substrate, and carrying out thermocuring to obtain the lithiated clay mineral PVDF-based composite solid electrolyte membrane. The lithiated clay mineral is introduced into a mixed system of PVDF and organic lithium salt, so that the crystallinity of PVDF can be effectively reduced, an amorphous region is increased, conversion of PVDF crystals to beta-type PVDF is promoted, and the dissociation process of the lithium salt in the electrolyte is promoted; meanwhile, the lithiated clay mineral is introduced, so that the ionic conductivity can be obviously improved, an electrochemical window is widened, the mechanical property is improved, and the growth of lithium dendrites is inhibited.

The invention belongs to the field of carbon dioxide geological sequestration and oil-gas field development, and relates to a shale carbon dioxide adsorption expansion damage experiment method considering a hydration state, which comprises the following steps: processing a shale sample according to requirements; the shale is subjected to constant-humidity regulation and control pretreatment, and in the process, different relative humidity environments can be used for pretreatment, so that the influence of different clay mineral hydration interlayer spacing states on adsorption expansion is obtained; soaking the pretreated shale in supercritical carbon dioxide, adsorbing the sample when the temperature and pressure conditions reach a set value, soaking until the rock sample reaches adsorption saturation, and treating by using carbon dioxide with different pressures and temperature gradients; according to collection of sample microstructure and mechanical data, damage can be treated through crack initiation position comparison, porosity and gray scale quantitative analysis and macro-mechanical parameter evolution. The method provides an experimental method for carbon dioxide geological sequestration safety assessment and shale gas fracturing parameter optimization.

The invention provides continuous quartz sand acid leaching equipment, which belongs to the technical field of quartz sand processing and comprises a pre-grinding part, an acid leaching assembly, a material transferring mechanism, a transverse grinding barrel, an extrusion grinding rod, a conveying fin and an extrusion grinding area. The pre-grinding part comprises a transversely-arranged grinding barrel, conveying fins are arranged on the inner wall of the transversely-arranged grinding barrel, an extrusion grinding rod is arranged in the transversely-arranged grinding barrel, and an extrusion grinding area is formed between the bottom of the extrusion grinding rod and the conveying fins; acid leaching assemblies are arranged outside the pre-grinding part, and a material transferring mechanism is arranged between the acid leaching assemblies. According to the device, through the extrusion grinding rod and the conveying fins in the transverse grinding barrel, an extrusion grinding area is formed at the bottom of the extrusion grinding rod, and through rotation of the transverse grinding barrel and pushing of the conveying fins, the grinding efficiency is improved; and the quartz sand is accumulated in the extrusion grinding area and makes contact with the extrusion grinding rod for extrusion grinding, and impurities such as clay minerals attached to the surface of the quartz sand are removed.

The invention relates to the field of organic matter-rich shale mineral type and cause research, and discloses a shale clay mineral composition quantitative recovery method, which comprises: S1, cutting and polishing a shale sample, and carrying out argon ion polishing; s2, based on SEM-EDS combined analysis, collecting morphology and energy spectrum characteristics of clay minerals with different causes, and constructing a clay mineral cause standard library; s3, AMICS analysis parameters are optimized, and 2-4 vision fields are selected for scanning to generate original data; s4, processing the scanning data, calculating the mineral content, and performing cross validation with an XRD-Rietveld result; and S5, in combination with a diagenetic evolution sequence and a mass conservation principle, inverting the contents of original montmorillonite and clastic clay minerals. According to the method, clay minerals of different causes are distinguished through the SEM-EDS double-constraint model, AMICS parameters are optimized, the recognition precision is improved, and quantitative recovery of original components is achieved in combination with diagenetic inversion.

Provided is a fluid catalytic cracking catalyst including faujasite-type zeolite, boehmite, a binder, and clay minerals, and satisfying the following formulas (1) and (2) in powder X-ray diffraction analysis:A / B≤1.2(1)A / C≥0.8(2)in the formulas (1) and (2), A is an integrated intensity of a diffraction peak attributed to (020) plane of the boehmite, B is an integrated intensity of a diffraction peak attributed to (120) plane of the boehmite, and C is an integrated intensity of a diffraction peak attributed to (331) plane of the faujasite-type zeolite.

A catalyst for fluid catalytic cracking is provided which contains faujasite-type zeolite, boehmite, a binder and clay minerals and which satisfies the following formulas (1) and (2) in powder X-ray diffraction analysis: A / B ≤ 1 .2 A / C ≤ 0.8 where in formulas (1) and (2), A is the integrated intensity of a diffraction peak assigned to the (020) plane of boehmite, B is the integrated intensity of a diffraction peak assigned to the (120) plane of boehmite, and C is the integrated intensity of a diffraction peak assigned to the (33 1) plane of the faujasite-type zeolite.

The invention discloses a water-based coating which comprises a basic coating, a regulator A and a regulator B, the regulator A is used for regulating the surface tension of the coating system, and the regulator B is used for regulating the rheological property of the coating system; the basic coating is prepared from the following components in parts by weight: 50 to 70 parts of refractory powder, 2 to 8 parts of binder, 20 to 40 parts of water and 0.1 to 5 parts of clay mineral. According to the water-based paint disclosed by the invention, the adaptive barrier of different sand molds and different coating processes is broken through, that is, the adaptive problem of different sand molds and different coating processes is solved through modular formula design, and multiple purposes are achieved through one paint. Customization of a coating product is achieved by adding a regulator A and a regulator B into a basic coating, two technical adaptation layers are included, the first layer adapts to different sand molds through an aggregate grading scheme and an adjustment scheme of the regulator A, and the second layer adapts to different coating modes through an adjustment scheme of the regulator B.

The invention relates to a thin interbed clay mineral content prediction method based on an RBF neural network, and the method mainly improves the longitudinal resolution through the inversion of the RBF neural network on the basis of multiple attributes, and compared with the conventional research, the method directly uses the seismic attributes, such as amplitude, as the input to learn a target curve, and improves the prediction efficiency. According to the method, the seismic frequency division reconstruction data body and the inversion body are selected as input, so that the longitudinal resolution and the well coincidence rate are greatly improved; in addition, the inversion body is used as input, so that the problem that neural network inversion geological laws are poor in previous research is solved, and an important basis can be provided for reservoir assessment and development; examples prove that the method disclosed by the invention is higher in precision of inverting the clay mineral content compared with a simulation method directly using waveform indication, and is suitable for reservoir parameter prediction of a thin interbed.

The invention provides a method for simulating the influence of montmorillonite clay mineral water on organic matter pyrolysis hydrocarbon generation, and belongs to the technical field of organic matter pyrolysis. The method comprises the following steps: heating montmorillonite to obtain dehydrated montmorillonite, mixing organic matters and the dehydrated montmorillonite in an argon atmosphere and a dry environment, transferring a mixed sample into a gold tube, and loading the sample; putting the gold tube into an iron reaction kettle, filling the reaction kettle with water, and cooling after heating reaction; putting the cooled gold tube into a gas collecting device, and calculating the amount of substance of gas according to an ideal gas state equation; the collected gas is subjected to GC analysis to obtain the percentage of each gas, the yield of each gas is calculated by combining the amount of substance of the gas, and the influence of the montmorillonite clay endogenous water on hydrocarbon generation by thermal decomposition of organic matters is evaluated. Under the condition that only the unified boundary condition of clay mineral water is changed, a verifiable judgment system of'endogenous water type-product spectrum characteristic-reaction channel 'is established for the first time.

This invention belongs to the field of oil and gas production enhancement and stimulation technology. It provides a FDEM simulation method and system for mineral-scale shale hydration-induced fracturing. The method includes the following steps: obtaining target reservoir stress, rock porosity, and permeability; preparing rock samples from the target stratigraphic layer and obtaining the mineral composition and content through X-ray diffraction experiments; constructing a polycrystalline geometric model of the minerals using random Voronoi mosaic technology; conducting core immersion hydration experiments to obtain the relationship between core water content and time; setting initial and boundary conditions for the model and establishing a numerical model of clay mineral hydration expansion-induced fracturing based on the finite discrete element method; and conducting numerical experiments on shale hydration-induced fracturing to obtain the micro-fracture propagation morphology induced by clay mineral hydration expansion. This invention considers the non-uniform mosaic distribution of multiple minerals in the reservoir rock, simulates the non-uniform stress distribution induced by clay mineral water absorption and expansion, and realizes numerical simulation of the mineral-scale shale hydration-induced fracturing process.

This application provides a method, apparatus, and system for determining the compressibility of shale oil reservoirs. The method includes: acquiring compressibility evaluation parameters for shale oil reservoirs, whereby these parameters are data corresponding to factors influencing the compressibility of the shale oil reservoir; analyzing these parameters using a dimensionality reduction method to obtain independent evaluation parameters; calculating a compressibility index based on the independent evaluation parameters; and determining the compressibility of the shale oil reservoir based on the compressibility index. This method uses a dimensionality reduction method to analyze the aforementioned compressibility evaluation parameters to obtain independent evaluation parameters, facilitating the calculation of the compressibility index. Based on this index, the compressibility of the shale oil reservoir is determined. Compared to methods that determine reservoir compressibility solely through brittleness indices or experimental methods such as clay mineral content, this method comprehensively considers multiple compressibility evaluation parameters that influence the compressibility of shale oil reservoirs, resulting in a more comprehensive analysis and improved accuracy in compressibility evaluation.

The present invention aims to develop a nail care product that offers excellent smooth spreadability, a uniform coating film resulting in superior gloss and gloss retention, long-lasting wear, and long-term stability of the formulation. [Solution] The following components (A) to (D); (A) Film-forming agent (B) Organically modified clay minerals (C) Silicone oil (D) Organic solvents A nail care product containing the following, wherein the mass ratio of component (B) to component (C) (B) / (C) is 0.1 or more and less than 10.

The present invention relates to a composition for oral administration with controlled release properties, comprising a complex of a compound of Chemical Formula 1 or a pharmaceutically acceptable salt thereof; and a clay mineral, and a method for preparing same.

The present application relates to a kind of preparation method and application of composite modified clay mineral adsorbent for adsorbing dioxin, and the preparation method includes the following steps: (1) clay mineral is crushed and sieved, sintering, obtain the clay mineral powder after sintering;(2) the clay mineral powder after sintering and cerium trichloride are mixed into deionized water, citric acid solution is added, obtain the cerium after clay mineral;(3) the cerium after clay mineral, sodium azide and alkali metal element are weighed and mixed uniformly, after temperature treatment, obtain cerium nitride & clay mineral compound;(4) the cerium nitride & clay mineral compound is dispersed into phosphate buffer solution, hafnium oxychloride solution is added, in situ photodeposition method is reacted, obtain composite modified clay mineral.Compared with traditional clay mineral, the composite modified clay mineral prepared in the present application not only has strong adsorption removal efficiency for dioxin, but also has better reusability.

To provide a composition for a skin protectant having not only an effect of preventing dyeing of the skin but also an effect of suppressing skin irritation caused by skin irritant components, and having both a dyeing prevention effect and a skin irritation suppression effect.SOLUTION: A composition for a skin protectant, containing a smectite-based clay component that is at least one compound selected from the group consisting of smectite-based clay minerals and organically modified smectite-based clay minerals, and an oil-soluble component, further containing a nonionic dispersion aid having an HLB of 11.0 or less, wherein a content ratio of the smectite-based clay component is 0.01-60 mass% based on the total mass, the composition being applied to the skin to form, on the skin, a protective film for protecting the skin.SELECTED DRAWING: None