Calcined purified ground surface soil and its use in life memorial fields

Abstract

This invention provides calcined, purified, and ground surface soil and its application in the field of memorial materials, belonging to the field of material modification and composite material technology. The surface soil originates from specific locations with special commemorative significance, such as birthplaces, former residences, and memorial sites. After pretreatment, gradient high-temperature calcination, magnetic separation purification, and fine grinding, a high-purity powder with an organic matter content ≤0.5%, heavy metal leaching ≤0.1 mg / L, and a particle size distribution of 1-50 μm is obtained. This powder, as a core emotional carrier, can be composited with inorganic cementitious systems such as silicate cement or resin systems such as epoxy resin, and manufactured into various commemorative products through processes such as molding and vacuum casting. This invention effectively solves the inherent defects of natural surface soil in commemorative applications, such as poor stability, low purity, and difficulty in molding, providing a novel commemorative material solution that combines unique emotional value with excellent physical properties, meeting the requirements for long-term preservation and safe and reliable use of memorial products.

Description

Technical Field

[0001] This invention belongs to the field of material modification and composite material technology, and more specifically, it relates to calcined, purified and ground surface soil and its application in the field of memorial. Background Technology

[0002] In the field of commemoration, people have always sought physical memorial carriers that can carry emotional connections. The surface soil of a specific location (such as the birthplace of the deceased, the courtyard of their former residence, or the topsoil of a special memorial site) contains unique regional memories and emotional attachments, making it a highly symbolic emotional medium. Its application in commemorative products can significantly enhance the emotional weight and exclusivity of the commemoration.

[0003] However, when natural topsoil is used directly to make permanent commemorative items, there are inherent defects that are difficult to overcome: First, its chemical and biological stability is extremely poor. The organic matter such as plant residues and humus in the soil is prone to decomposition, leading to mold, deformation, cracking, and even structural collapse of the products, making long-term preservation impossible. Second, the composition of impurities is complex and the content is high, including harmful substances such as gravel, sand, soluble salts, and heavy metals. This not only seriously affects the uniformity of the appearance and safety of the commemorative items, but may also cause the performance of the products to deteriorate due to the migration of impurities. Third, its physical processing performance is poor. The uneven particle size distribution and poor plasticity of natural topsoil make it difficult to achieve good composite with conventional cementing materials such as silicate cement and resin. It cannot be molded into products with dense structure, regular shape, or complex shape. Moreover, the finished products have low mechanical strength and poor weather resistance, making it difficult to meet the practical requirements of commemorative carriers.

[0004] Existing calcination processes are mostly designed for bulk industrial clay, with the core purpose of improving the performance of clay as a building material or reducing the sintering temperature. They do not take into account the characteristics of surface soil in the field of memorials, which are characterized by "small batches, multiple sources, and complex composition". They also do not address the complex requirements of this scenario, such as extreme purity, long-term stability, preservation of emotional attributes, and compatibility with various matrix materials. There is a lack of systematic material modification and application solutions.

[0005] Therefore, developing a comprehensive technology that can thoroughly purify and stabilize surface soil and flexibly adapt it to different high-performance matrices to prepare diverse commemorative products would fill existing technological gaps, meet the practical needs of the field of life memorial, and have significant practical significance and application value. Summary of the Invention

[0006] To address the aforementioned technical problems, this invention provides calcined, purified, and ground surface soil and its application in the field of memorial services, thereby solving the problems of impurities, poor stability, low standardization, and insufficient compatibility with memorial products in emotional carrier materials in the field of memorial services.

[0007] Calcinated, purified, and ground surface soil and its application in the field of memorial services.

[0008] Preferably, the surface soil of the location with emotional connection significance is subjected to calcination, purification and grinding in sequence: the calcination temperature is 500-800℃ and the duration is 2-4 hours; the purification includes magnetic separation and acid washing steps; the particle size distribution of the powder after grinding is 1-50μm, the D50 is 5-20μm, and the organic matter content is ≤0.5% and the heavy metal leaching is ≤0.1mg / L.

[0009] Preferably, the locations with emotional connection include, but are not limited to, the deceased's birthplace, former residence, memorial site, or location with special significance.

[0010] Preferably, the treated surface soil powder is used as a single base material, or it is compounded with bone ash powder, mineral pigments and functional fillers to form a standardized composite base material, with the compounding mass ratio being treated surface soil: other components = (50-95): (5-50).

[0011] Preferably, the functional filler is an inorganic filler that enhances the dispersibility of powder or improves the mechanical properties of the product.

[0012] Preferably, the standardized composite base material is mixed with inorganic cementitious materials, fiber reinforcing materials and water, and then molded under pressure of ≥20MPa. After molding, it is cured according to the system of "curing at 20-60℃ and humidity >90% for 1-3 days + drying and curing at 50-100℃ for 2-7 days" to obtain inorganic composite material commemorative products.

[0013] Preferably, the inorganic cementitious material is selected from at least one of silicate cement, magnesium phosphate cement, and calcium phosphate cement; the fiber reinforcing material is selected from at least one of polyvinyl alcohol fiber, basalt fiber, and carbon fiber.

[0014] Preferably, surface soil powder modified with silane / polymer coupling agent is mixed with transparent / semi-transparent polymer resin, curing agent and coupling agent, and then vacuum cast and cured. After finishing by grinding / polishing / coating / laser engraving, resin-based composite material commemorative products are obtained.

[0015] Preferably, the polymer resin is selected from at least one of epoxy resin, polyurethane resin, and acrylic resin.

[0016] Preferably, the memorial products include monuments, art pieces, memorial plaques, urn accessories, or memorial badges.

[0017] Compared with existing technologies, this invention has the following beneficial effects: In this invention, by calcining, purifying, and grinding the surface soil, impurities such as organic matter and heavy metals are removed, improving the stability and safety of the material and meeting the requirements for long-term preservation of commemorative items. In this invention, by selecting surface soil with emotional significance, commemorative items carry unique emotional value, enhancing the emotional connection of life commemoration. In this invention, by setting standardized indicators for surface soil powder, standardized production of emotional carrier materials is achieved, ensuring the consistency of commemorative item quality. In this invention, by compounding different components into a composite base material, the material's adaptability is improved, meeting the performance requirements of different commemorative items. In this invention, by providing two molding systems—inorganic cementitious and resin-based—the application range of treated surface soil in the field of life commemoration is broadened. In this invention, through functional fillers, surface modification, and specific processes, the mechanical properties and appearance of commemorative items are improved, balancing practicality and aesthetics. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the components of the present invention. Detailed Implementation

[0019] To make the technical solution of this invention clearer and more repeatable, the following provides detailed and practical implementation methods for the entire process of raw material preparation, core processes (pretreatment-calcination-purification-grinding), composite material preparation and commemorative product processing. These methods cover equipment parameters, process conditions, testing standards and key operating points, ensuring that each step meets the dual requirements of "preserving the emotional carrier attributes + achieving high-performance indicators".

[0020] Raw material preparation and pretreatment: Select surface soil from specific locations with clear emotional connections, such as the deceased's birthplace (top 0-20cm soil in the courtyard), flower bed soil from the former residence, or memorial sites (such as the school playground or former park). The requesting party must provide location documentation (such as photos and address descriptions), and professional samplers must take samples on-site to ensure the "emotional authenticity" of the soil samples.

[0021] Sampling method: Sampling tools: Stainless steel sampling shovel (20cm×15cm) free from impurities and contamination, and polyethylene sealed bags (5L, pre-dried and sterilized at 80℃). Sampling quantity: The sampling quantity per batch is ≥5kg (10% is reserved for testing and the remainder is used for processing). There are 3-5 sampling points at the same location (the distance between each point is ≥1m). 0.5-1kg of soil is taken from each point and mixed to form a "representative soil sample". Sampling restrictions: Avoid obvious impurities such as dead leaves, household waste, and concrete residue on the surface. If the soil sample contains plant roots, visible roots (diameter ≥ 0.5 mm) must be removed manually first.

[0022] Pretreatment process: Air dry to remove moisture: Spread the mixed soil sample evenly on a stainless steel tray (thickness ≤3cm), place it in a ventilated and shaded place to air dry naturally at an ambient temperature of 20-30℃ and relative humidity ≤60% for 24-48 hours, turning it over once every 8 hours until the soil sample feels loose (no clumps) and the initial moisture content drops from 15%-25% to 8%-12%.

[0023] Coarse screening for impurity removal: A double-layer vibrating screen (model S49-1000, screen material is 304 stainless steel) is used for grading and screening: First layer screen: 10 mesh (2mm aperture), removes gravel, small stones, coarse roots and other impurities. The material that passes through the screen is discarded, and the material that passes through the screen enters the second layer. The second sieve is 40 mesh (0.45mm aperture) to remove finer sand particles and residual impurities. The material passing through the sieve is collected as "coarse-processed soil". If the material passing through the sieve (particle size 0.45-2mm) accounts for ≤5%, it is discarded. If it accounts for >5%, it needs to be returned to dry and then re-sieved.

[0024] Low-temperature drying: The coarsely treated soil was transferred to a forced-air drying oven (model DHG-9240A, temperature control accuracy ±1℃), set at 80℃ and 1.5m / s, and dried for 4-6 hours. During this period, samples were taken every 2 hours to test the moisture content (using a halogen moisture analyzer, model MS105, sample size 5g / time) until the moisture content stabilized at ≤3.5%, thus obtaining "pretreated soil". After cooling to room temperature, the soil was sealed and stored (in a polyethylene sealed container with a desiccant inside).

[0025] Gradient high-temperature calcination purification: Preparations before calcination: Equipment: Box-type muffle furnace (model SX2-12-10, rated temperature 1200℃, temperature control accuracy ±5℃), refractory crucible (material corundum, size 100mm×150mm, volume 1.2L, purified by empty firing at 1000℃ for 2 hours before use). Loading: Spread the pretreated soil evenly into the crucible, with a thickness of 3-5cm (avoid excessive accumulation that could lead to uneven calcination). The amount of material loaded into each crucible should be ≤800g, and the number of crucibles in the same batch of calcination should be ≤6 (to ensure uniform temperature inside the furnace).

[0026] Gradient heating calcination process: The system adopts a "step-up heating - constant temperature insulation" mode, with the following specific parameters: Heating stage 1: room temperature → 500℃, heating rate 5℃ / min, holding for 1 hour (purpose: to slowly remove residual free water and some volatile organic matter from the soil sample, and to avoid soil sample clumping caused by rapid heating). Heating stage 2: 500℃→950℃, heating rate 8℃ / min, holding for 3h (core stage: to fully combust and decompose organic matter, the reaction formula is CxHyOz+O2→CO2↑+H2O↑, while soluble salts (such as sulfates and chlorides) volatilize, and heavy metals (such as Pb and Cd) are converted into stable oxides). Cooling stage: Turn off the power to the muffle furnace and allow it to cool naturally to below 150°C (about 6-8 hours). Then remove the crucible (avoid removing it at high temperature to prevent the crucible from cracking or the soil sample from absorbing moisture) to obtain "calcined soil".

[0027] Magnetic separation purification: Equipment: Drum magnetic separator (model XCGS-50, adjustable magnetic field strength range 0-15000Gs, processing capacity 50kg / h). Process parameters: magnetic field strength 12000Gs, drum rotation speed 30r / min, calcined soil is evenly fed into the feed inlet (feed rate 100g / min), iron impurities (such as Fe2O3 and Fe3O4 particles) are removed by magnetic adsorption, and the "magnetically separated soil" is collected after magnetic separation. The magnetic separation is repeated twice (to ensure that the iron impurity removal rate is ≥95%). Secondary screening: The magnetically separated soil is passed through a 100-mesh (0.15mm aperture) vibrating screen to remove a small amount of agglomerated particles generated during the magnetic separation process, resulting in "purified soil".

[0028] Purification effect test: Organic matter content detection: The "loss on ignition method" is used. Take 5g of purified soil sample (accurate to 0.0001g), place it in a porcelain crucible, and ignite it in a muffle furnace at 600℃ for 2 hours. After cooling, weigh it and calculate the weight loss rate (organic matter content = (mass before ignition - mass after ignition) / mass before ignition × 100%), which should be ≤0.5%. Heavy metal leaching detection: Refer to the "Horizontal Oscillation Method for Leaching Toxicity of Solid Waste" (HJ557-2010), take 10g of purified soil, add 100mL of deionized water, oscillate at a rate of 110r / min for 8h, filter, and use an inductively coupled plasma mass spectrometer (ICP-MS, Agilent 7900) to detect the leaching of Pb, Cd, Cr, Hg, and As. The total amount should be ≤0.1mg / L.

[0029] Fine grinding and grading: Grinding equipment and parameters: Equipment: Planetary ball mill (model QM-3SP4, maximum loading capacity 4L, speed range 0-600r / min); Grinding ball selection: Zirconia grinding balls (specifications: 5mm and 10mm in diameter, mixed at a mass ratio of 1:2), ball-to-material ratio of 4:1 (i.e., 400g of grinding balls for every 100g of purified soil). Grinding process: Put the purified soil and grinding balls into an agate grinding jar (1L capacity, to avoid metal contamination), seal the jar, and then put it into a ball mill. Set the speed to 450r / min and the grinding time to 2.5-3h (stop for 5min every 1h to prevent the powder from agglomerating due to excessive temperature inside the jar). Observe the grinding status every 30min during the process (to avoid the grinding balls getting stuck).

[0030] Airflow classification: Equipment: Laboratory small air classifier (model QLF-100, classification accuracy ±1μm, throughput 500g / h). Classification parameters: Classification air pressure 0.6MPa, feed rate 50g / min, classifying wheel speed 8000r / min, collecting "classified powder" (particle size 1-50μm), sieving out coarse powder (particle size > 50μm, returned to the ball mill for re-grinding) and fine powder (particle size < 1μm, if the proportion ≤ 3%, it is retained, if > 3%, it is collected separately for resin-based products); Particle size detection: A laser particle size analyzer (model Mastersizer3000, detection range 0.01-3500μm) was used. 0.1g of the graded powder was taken, and deionized water (containing 0.1% sodium hexametaphosphate dispersant) was added. After ultrasonic dispersion for 5min, the particle size was detected. The required particle size distribution is 1-50μm, and D50 (median particle size) is 5-20μm (if D50 deviates, adjust the speed of the classifying wheel: if D50 is too large, increase the speed; if it is too small, decrease the speed).

[0031] Refined acceptance of surface soil materials: The graded powder is sealed in polyethylene bottles (with built-in desiccant), labeled with "base material number, origin, preparation date, and key indicators." Acceptance criteria are as follows:

[0032] Preparation of standardized composite matrix materials: Single powder matrix (form 1): The material directly uses "3.3 qualified refined surface soil base material", without the need for additional components. It only needs to be screened through a 200-mesh (0.075mm aperture) screen for final impurity removal to ensure no agglomerated particles. It is used for commemorative products with high requirements for "pure surface soil emotional carrier" (such as the core component of cremated remains mixed ornaments).

[0033] Prefabricated composite material body (morphology 2): Based on the commemorative needs, the following are three typical formulations and preparation processes for selecting composite components: Topsoil-bone ash composite substrate (emotionally integrated type): Raw material ratio: 80 parts by weight of refined topsoil base material, 20 parts of bone ash powder (bone ash pretreatment: the deceased's bone ash is dried at 105℃ for 2 hours and passed through a 100-mesh sieve to remove bone residue and impurities). Mixing equipment: Twin-screw mixer (model SHJ-20, screw diameter 20mm, speed 300r / min); Process: Put the surface soil base material and bone ash powder into the mixer and dry mix for 15 minutes (stop the machine every 5 minutes and turn it over once to ensure uniform mixing). Take samples to test the uniformity of mixing (using the "color difference method", take 5 sample points, and the color difference ΔE≤1.0 is qualified). Molding and Consolidation: The mixed powder is loaded into a circular mold (50mm in diameter, 10mm in thickness), and held under pressure of 15MPa for 3 minutes using a hydraulic press (model YQ32-100). After demolding, it is placed in a 60℃ forced-air drying oven and dried for 2 hours to obtain "prefabricated composite blocks" (density ≥1.2g / cm³). 3 It can be directly used for subsequent inorganic / resin composites.

[0034] Topsoil-mineral pigment composite base (color decorative type): Raw material ratio: 90 parts refined surface soil base material, 5 parts iron oxide red pigment (food grade, particle size ≤5μm), 5 parts titanium dioxide white pigment (anatase type, particle size ≤3μm); Mixing process: First, premix the pigment with 10 parts of surface soil base material in a high-speed mixer (model GHJ-5, speed 5000r / min) for 5 minutes, then add the remaining 80 parts of surface soil base material and transfer to a twin-screw mixer (speed 250r / min) to mix for 10 minutes; Quality control: Test pigment dispersibility (take 0.5g of mixed powder, compress it into a tablet and observe it under a microscope (400x), no pigment agglomerates or particles are found), and color uniformity (color difference ΔE≤0.8).

[0035] Topsoil-functional filler composite matrix (performance-enhanced type): Raw material ratio: 85 parts refined surface soil base material, 5 parts nano silica (particle size 20nm, to enhance dispersibility), 10 parts glass microspheres (particle size 10μm, to reduce density); Preparation process: Nano-silica was diluted with ethanol (analytical grade) to a 5% suspension, mixed with surface soil base material, and ultrasonically dispersed for 30 min (power 300W). After drying at 80℃ to remove ethanol, glass microspheres were added and mixed with a three-dimensional mixer (model SYH-10) for 20 min (speed 60r / min). Performance testing: Measure the powder flowability (angle of repose ≤ 35°, using the fixed funnel method) to ensure smooth subsequent molding.

[0036] Examples of commemorative product preparation: Example 1: High-strength, weather-resistant inorganic composite monument: Raw material formula (total mass 12kg):

[0037] Preparation process: Dry mixing: Add the surface soil base material, cement, polyvinyl alcohol fiber, and water-reducing agent into a planetary mixer (model JS-500, mixing blade speed 200r / min), dry mix for 3 minutes until the fiber is evenly dispersed (no clumps). Wet mixing: Slowly add deionized water, adjust the stirring speed to 300 r / min, stir for 5 min to form a uniform paste (consistency: slump 50-80 mm, tested with a slump cone). Compression molding: Mold: 300mm×200mm×80mm steel mold (with release agent on the inner wall, model WD-40); Equipment: Four-column hydraulic press (model YQ32-300), set pressure 30MPa, hold pressure for 5 minutes (air venting once during the period: pressure drops to 10MPa, holds for 10 seconds, then rises to 30MPa again). Demolding: After depressurization, a mechanical ejection device is used to demold the "monument blank" (without cracks or missing corners on the surface); Maintenance process: First stage (constant temperature and humidity curing): Place the green body into the curing chamber (model YH-40B, temperature control accuracy ±1℃, humidity control accuracy ±2%), set the temperature to 35℃ and relative humidity to 95%, and cure for 48 hours (turn it over once every 24 hours to avoid uneven local moisture absorption). Second stage (drying and curing): Transfer to a hot air circulating drying oven (model CT-C, wind speed 2m / s), set the temperature to 80℃, and dry for 72 hours (check the moisture content every 24 hours until it drops to ≤1.5%). Surface finishing: Grinding: First, use 80-grit sandpaper to grind the surface of the blank (to remove burrs), then use 400-grit sandpaper to finely grind (surface roughness Ra≤1.6μm, tested with a roughness tester). Polishing: Use a wool wheel polisher (1500 r / min), apply chromium oxide polishing paste (1 μm particle size), and polish for 3 min / side; Laser engraving: Use a fiber laser engraving machine (model JPTM7, power 20W), engraving depth 0.5mm, font size 15mm (Song typeface), content includes the deceased's name, date of birth and death, and a memorial message (residue is blown away with compressed air after engraving).

[0038] Finished product inspection: Mechanical properties: The compressive strength was tested using a universal testing machine (model WDW-100), with a sample size of 50mm×50mm×50mm, a loading rate of 2mm / min, and the measured value was ≥35MPa; Density and water absorption: Bulk density is calculated using the "displacement method" (≥1.95 g / cm³). 3 The water absorption rate was determined by the "boiling method" (boiling for 2 hours, water absorption rate ≤3.5%). Weather resistance: Freeze-thaw cycle test (-30℃ freezing for 4h → 60℃ water bath for 4h as 1 cycle, 50 times in total), after the test, there is no cracking or peeling in appearance, and the strength retention rate is ≥90% (strength retention rate = strength after freeze-thaw / strength before freeze-thaw × 100%).

[0039] Example 2: High-transmittance resin-based art ornaments: Raw material formula (total mass 100 parts, by weight):

[0040] Preparation of surface-modified soil B (pretreatment steps): Preparation of coupling agent solution: Take 1.2 parts of KH-560, add 48.8 parts of ethanol (analytical grade), stir well, and then adjust the pH to 5.0±0.2 with glacial acetic acid (analytical grade) (measured with a pH meter). Modification treatment: Add 40 parts of refined surface soil base material to the coupling agent solution, transfer to an ultrasonic cleaner (model KQ-500VDE, power 500W), and ultrasonically disperse for 30 minutes (temperature control ≤40℃ to avoid excessive ethanol evaporation). Drying and Activation: The dispersion was transferred to a rotary evaporator (model RE-52AA, vacuum degree -0.095MPa), and evaporated at 60℃ for 1 hour to remove ethanol. It was then dried in a 105℃ forced-air drying oven for 2 hours to obtain "Surface-Modified Clay B" (infrared spectroscopy detection: at 1080 cm⁻¹). -1 The presence of Si-OC characteristic peaks at the point indicates successful modification.

[0041] Ornament manufacturing process: Resin preheating: Put E-44 epoxy resin into a three-necked flask (500mL), place it in an oil bath (model HH-S2), and preheat at 60℃ for 30min to reduce viscosity (viscosity after preheating ≤500mPa・s, measured with a rotational viscometer). Mixing and dispersing: Add surface modifier B, defoamer, and ultraviolet absorber. First, mechanically stir (800 r / min) for 10 min, then ultrasonically disperse for 40 min (300 W power, temperature ≤ 65 ℃) until the slurry is free of visible particles (filter with a 400 mesh sieve, residue ≤ 0.1%). Adding curing agent: Cool down to 40℃, add methyltetrahydrophthalic anhydride, stir for 15 min (500 r / min), and degas under vacuum (vacuum chamber model DZF-6050, vacuum degree -0.095MPa, degas for 15 min, stop after observing no bubbles). Vacuum casting: Mold: Silicone mold (customized ornament shape, such as heart or square, with release agent applied to the inner wall), preheated in an oven at 60℃ for 10 minutes; Casting: Slowly inject the slurry into the mold (avoiding air bubbles), with the liquid level 5mm from the top of the mold, and then place it in the vacuum chamber again for 5 minutes to remove air bubbles; Curing process: Room temperature curing: Place the mold in a clean environment at 25℃ and cure for 24 hours (observe every 8 hours to avoid uneven curing in some areas); Post-curing: Transfer to a 60℃ oven and cure for 6 hours (to improve resin cross-linking degree and enhance hardness). Demolding and finishing: Demolding: After the mold has cooled to room temperature, slowly peel off the silicone mold (to avoid deformation of the ornament); Sanding: Sand the edges with 1000-grit sandpaper (to remove burrs), then finely sand with 2000-grit sandpaper (surface roughness Ra≤0.8μm); Polishing: Use a cotton cloth wheel polisher (2000 r / min), apply alumina polishing liquid (0.5 μm particle size), polish for 5 min until the surface is bright (transmittance ≥85%, measured with a transmittance meter, wavelength 550 nm).

[0042] Finished product inspection: Hardness: Tested with a Barcol hardness tester (model HB-3000), measured value ≥90; Anti-aging properties: Xenon lamp aging test chamber (model SN-900), conditions: irradiation intensity 0.71W / m 2 (340nm), temperature 63℃, relative humidity 50%, after 800h test, color difference ΔE≤2.0 (tested with colorimeter model CR-400), no yellowing or cracking; Light transmittance: ≥80% at 550nm wavelength, and the surface soil particles are uniformly suspended (no obvious agglomeration observed under a microscope at 400x magnification).

[0043] Example 3: Composite memorial plaque made of cremated remains and topsoil (emotionally customized): Raw material formula (total mass 500g): Topsoil-bone ash precast composite substrate (4.2.1 preparation): 300g; Magnesium phosphate cement (rapid-setting type, initial setting 15min, final setting 30min): 150g; Basalt fiber (3mm in length, 10μm in diameter): 10g; Deionized water: 40g; Black mineral pigment (iron oxide black, particle size ≤5μm): 5g (for printing portraits of the deceased).

[0044] Preparation process: Preparation of blank: Dry mix precast composite base material, magnesium phosphate cement and basalt fiber for 5 minutes, add deionized water and stir for 3 minutes to form a paste. Pour into a 100mm×80mm×5mm steel mold, press and shape with 10MPa pressure, hold pressure for 2 minutes, and after demolding, cure in an environment of 25℃ and 60% humidity for 24 hours. Portrait printing: Mix iron oxide black with a small amount of water to form a paste, and use screen printing (300 mesh) to print the deceased's portrait on the front of the memorial plaque. Dry at 80℃ for 1 hour. Edge sealing: Apply epoxy resin varnish (transparent, 60% solids content) to the edges of the commemorative plaque to prevent moisture intrusion, and cure at room temperature for 12 hours; Performance testing: compressive strength ≥25MPa, water absorption ≤4%, head adhesion (cross-cut test, 1mm spacing, no peeling).

[0045] Quality control and storage requirements: Process quality control: A 50g sample of each batch of surface soil substrate must be retained, sealed and labeled, and stored for one year for traceability purposes. Key processes (calcination, grinding, compounding) require recording parameters (such as calcination temperature curve, grinding time, and mixing ratio) to form a "process record sheet". Each finished product must be inspected for appearance (no cracks, missing corners, color difference), and mechanical properties must be sampled for testing (sampling ratio 10%).

[0046] Storage and Transportation: Refined surface soil base material: sealed in polyethylene bottles, stored in a dry environment (temperature 15-25℃, relative humidity ≤50%), shelf life 6 months; Souvenirs: Inorganic products are packaged in foam (5cm thick), and resin products are wrapped in soft cloth and placed in gift boxes. Avoid violent vibrations during transportation (stack height ≤ 3 layers).

[0047] This implementation method ensures that each step is repeatable by clearly defining the equipment model, process parameters, and testing standards, while taking into account both the "emotional carrier attribute" and "product high performance," making it suitable for large-scale production or the preparation of small-batch customized memorial products.

[0048] The embodiments of the present invention are given for illustrative and descriptive purposes only, and are not intended to be exhaustive or to limit the invention to the forms disclosed. Many modifications and variations will be apparent to those skilled in the art. The embodiments were chosen and described in order to better illustrate the principles and practical application of the invention, and to enable those skilled in the art to understand the invention and to design various embodiments with various modifications suitable for a particular purpose.

Claims

1. A standardized composite matrix for use in the field of memorial services, characterized in that, The raw material includes surface soil from a specific source that has undergone calcination, purification, and grinding. The surface soil meets the following technical indicators: particle size distribution of 1-50 μm, D50 of 5-20 μm, organic matter content ≤0.5%, and heavy metal leaching ≤0.1 mg / L. The standardized composite matrix material is in one of the following forms: (1) The calcined, purified and ground surface soil is directly used as a single powder base material; (2) A prefabricated composite material body formed by premixing and solidifying the calcined, purified and ground surface soil with at least one of bone ash powder, mineral pigments or functional fillers.

2. The standardized composite matrix according to claim 1, characterized in that, The specific source of the topsoil refers to a location with emotional significance, including but not limited to the birthplace, former residence, memorial site, or other place of special significance associated with the deceased.

3. The standardized composite matrix according to claim 1, characterized in that, In morphology (2), the mass ratio of the calcined, purified and ground surface soil to bone ash powder, mineral pigments or functional fillers is (50-95):(5-50), and the functional fillers are inorganic fillers that enhance the dispersibility of powder or improve the mechanical properties of products.

4. The application of a standardized composite matrix as described in any one of claims 1-3 in the preparation of memorial products, characterized in that, The application includes using the standardized composite matrix as a core emotional carrier component, and compounding it with one of the following systems to prepare commemorative products: (1) Mixed with inorganic cementitious materials, fiber reinforcing materials and water, and then molded and cured to form inorganic composite commemorative products; (2) Mix with transparent or semi-transparent polymer resin, curing agent and coupling agent, and then vacuum cast, cured and surface finished to form resin-based composite commemorative products.

5. The application according to claim 4, characterized in that, In application (1), the inorganic cementitious material is selected from at least one of silicate cement, magnesium phosphate cement, and calcium phosphate cement.

6. The application according to claim 4, characterized in that, In application (1), the fiber reinforcement material is selected from at least one of polyvinyl alcohol fiber, basalt fiber, and carbon fiber.

7. The application according to claim 4, characterized in that, In application (1), the pressure of the molding is not less than 20MPa; the curing system is as follows: first, cure for 1-3 days at 20-60℃ and humidity >90%, and then dry cure for 2-7 days at 50-100℃.

8. The application according to claim 4, characterized in that, In application (2), the polymer resin is selected from at least one of epoxy resin, polyurethane resin, and acrylic resin.

9. The application according to claim 4, characterized in that, In application (2), the calcined, purified and ground surface soil is surface treated before mixing, and the surface treatment is carried out by coating modification with silane coupling agent or polymer coupling agent; the surface finishing includes at least one of grinding, polishing, coating or laser engraving.

10. The application according to claim 4, characterized in that, The commemorative items include monuments, art pieces, memorial plaques, urn accessories, or commemorative badges.

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