87 results about "Biomass ash" patented technology

The invention provides a biomass gasification system and a fluidized bed gasification process, the system comprises a fluidized bed gasification furnace, a cyclone separator and a material returning leg, the fluidized bed gasification furnace is provided with a gasification cavity and a gas chamber, and a fluidized bed formed by bed materials is arranged in the gasification cavity. Bed materials are added into the gasification furnace in a spiral feeding and pneumatic conveying combined mode, a fluidized bed is established, biomass particles are added after temperature rise, the pressure in the gasification furnace is kept to be certain, and an auxiliary gasification agent enables the biomass particles to be in a fluidized state. According to the invention, the melting characteristic of biomass ash can be effectively improved, the problem of easy slag bonding during biomass gasification is solved, the gasification temperature is effectively increased, and the methane content in the synthesis gas is reduced. The bed material can catalytically crack tar generated in the biomass gasification process, the quality of synthesis gas is optimized, the synthesis gas is prevented from being bonded and attached to the metal wall of a downstream device, the yield of the synthesis gas and the stability of the device are improved, and the heat exchange efficiency of a downstream waste heat recovery unit is enhanced.

The application discloses a device and method for preparing green hydrogen through biomass pyrolysis and gasification, relates to the technical field of green hydrogen preparation, and solves the problems of blockage and corrosion caused by ash melting and slagging in the pure oxygen gasification process, and the problem of low energy utilization rate. The device for preparing green hydrogen through biomass pyrolysis and gasification comprises a pyrolysis reaction device, and the pyrolysis reaction device comprises a pyrolysis reaction tank connected with a high-temperature heat carrier conveying spiral, a biomass raw material storage bin, a biomass raw material conveying spiral and a pyrolysis solid-phase product conveying spiral. In the application, biomass raw materials are converted into biochar and pyrolysis oil gas through pyrolysis technology, the biomass ash is effectively cut, and problems such as blockage and corrosion caused by ash melting and slagging in the pure oxygen gasification process are effectively avoided; the high-temperature pyrolysis oil gas is directly subjected to pure oxygen gasification reaction through gasification technology, the sensible heat and latent heat in the pyrolysis oil gas are fully utilized, and the energy utilization rate is high.

The invention discloses a high-activity red mud-biomass ash composite oxygen carrier and a multistage construction method and application thereof, and belongs to the technical field of solid waste resource utilization, pretreated red mud powder and biomass ash are compounded, and the biomass ash composite red mud oxygen carrier is prepared after drying and roasting; through modification of K and Ca components in the biomass ash, a high-activity phase is directionally generated in the red mud, an alkaline site is introduced, the oxygen vacancy concentration is increased, and the surface property is optimized; when the oxygen carrier is applied to a chemical looping gasification process, the release activation energy of lattice oxygen can be reduced, the reaction rate and the carbon conversion rate can be improved, the generation of CO2 can be inhibited, the selectivity and the yield of synthesis gas can be improved, and the oxygen carrier has excellent anti-sintering capability and cycling stability; a large amount of solid waste red mud and biomass ash are used as raw materials, the oxygen carrier preparation process has the characteristics of low cost, simple process and environmental friendliness, and a new way is provided for high-value utilization of the red mud and the biomass ash and industrial application of a chemical looping technology.

The present invention discloses a two-step, strong and weak filling method for continuous mining and filling with biomass ash and carbon sequestration. In the first filling step, biomass ash is used to replace cement or fly ash to increase the strength of the filling body and form a strong filling. In the second filling step, carbon dioxide is simultaneously injected to create a carbon sequestration cavity, forming a weak filling. Both filling steps adopt a full filling method, requiring the filling slurry to connect with the roof. The present invention adopts an alternating arrangement of strong and weak filling, effectively sealing and sealing carbon dioxide while strictly ensuring the safety and stability of the overburden above the mining site. It also recycles biomass ash solid waste, reduces material preparation and carbon sequestration costs, and improves economic and social benefits.

The present invention discloses a method for predicting the dynamic fouling and slagging tendency of biomass ash based on the change of ashing temperature, which relates to the technical field of predicting biomass ash fouling and slagging, and includes: determining the sintering rate and sintering characteristic index of biomass ash at different temperatures; determining the melting characteristic temperature and melting characteristic index of biomass ash at different temperatures; determining the fixed-phase fouling and slagging index and volatile-phase fouling and slagging index during the ashing process of biomass ash at different temperatures; and determining the comprehensive fouling and slagging tendency of biomass ash. The beneficial effect of the present invention is that, based on the change rules of the melting characteristic index and ash sintering rate of biomass ash at different ashing temperatures, and simultaneously considering the distribution and allocation rules of alkali metal components in the fixed phase and volatile phase during the fouling and slagging process of biomass ash, it makes up for the deficiency of ignoring the melting characteristics and sintering characteristics of biomass ash in the prior art, and improves the accuracy and reliability of the prediction results of the dynamic fouling and slagging tendency of biomass ash at different ashing temperatures.

The application discloses a method for preparing activated carbon precursor by removing biomass ash through wood vinegar and hydrothermal carbonization. Biomass raw materials are subjected to hydrothermal carbonization in a wood vinegar liquid medium to obtain biomass-based activated carbon precursor. The application innovatively utilizes the effective organic acid components in the acidic wood vinegar and combines hydrothermal carbonization to avoid the use of strong acid and strong base and pollution caused in the washing process. The method is easy to realize industrial popularization and application and is environment-friendly without significantly increasing the process cost. In addition, the method fully utilizes the acidic liquid byproduct, wood vinegar, in the process of preparing biochar through biomass pyrolysis, and realizes high-value comprehensive utilization of the biomass pyrolysis product on the basis of preparing the biomass-based activated carbon precursor.

The invention discloses a biomass power plant ash composition for improving soil carbon sink as well as a preparation method and application of the biomass power plant ash composition, and belongs to the technical field of agricultural resources and environment. The composition is formed by compounding fly ash and slag according to the dry basis mass ratio of (2-3): 1, and the heavy metal content of the composition meets the agricultural safety standard. The preparation method comprises the steps of raw material pretreatment and optimized compounding. The core of the method is that the fly ash is used as a main carbon source by increasing the proportion of the fly ash, physical protection is provided by utilizing the microporous structure of the slag, and the fly ash and the slag jointly act on the soil, so that the organic carbon library of the soil is rapidly and stably increased. Experiments show that the composition provided by the invention can significantly improve the organic carbon content and the carbon library management index (CPI) of soil, effectively reduce the daily average mineralization rate of organic carbon, and realize efficient and high value-added resource utilization of biomass ash in the field of soil carbon sequestration.

The invention relates to the technical field of low-carbon gelling, in particular to a preparation method of a low-carbon gelling material containing AOD (Argon Oxygen Decarburization) slag solid waste. The preparation method comprises the following steps: adding 50-60 parts of activated AOD slag and 20-30 parts of modified aluminum oxide into 80-100 parts of water, stirring and dispersing to form a matrix suspension, sequentially adding 10-15 parts of biomass ash, 5-8 parts of nano CaCO3 and 3-5 parts of sodium carbonate into the matrix suspension, and stirring at the stirring speed of 200-300 rpm for 30-40 minutes; 0.8-1.2 parts of superfine basalt fibers and 0.3-0.6 part of sodium gluconate are added, the mixture is stirred at the speed of 500-600 rpm for 15-20 min, and the low-carbon cementing material is obtained. The early strength increasing speed of the low-carbon cementing material containing the AOD slag solid waste is increased, and the durability of the low-carbon cementing material containing the AOD slag solid waste under complex environmental conditions is improved.

The invention discloses a method for efficiently utilizing biomass in a metallurgical blast furnace, which comprises the following steps: S1, pretreating a biomass raw material to obtain a biomass crushed material; s2, drying the biomass crushed material to obtain a biomass dried material; s3, baking the biomass dried material at low temperature to obtain a biomass baked material; s4, performing primary pyrolysis on the biomass baking material to obtain primary pyrolysis gas and biomass pyrolysis carbon; s5, the biomass pyrolytic carbon is subjected to secondary pyrolysis, and biochar, biomass ash and secondary pyrolysis gas are obtained; and S6, the first-stage pyrolysis gas is heated and purified, and then the purified first-stage pyrolysis gas and the purified second-stage pyrolysis gas are sprayed into the blast furnace to serve as an energy medium and a reducing agent to be utilized. According to the method, the biomass energy can be used for the metallurgical blast furnace, and the influence of alkali metal elements introduced into the biomass on the quality of blast furnace equipment and steel products can be avoided.

This invention discloses a method for screening the stability of biomass-derived hard carbon raw materials. The method involves treating biomass materials from different sources and batches that can be used to prepare hard carbon with an acid solution, then testing the sugar content, ash content, and coin capacity of the finished hard carbon. The method utilizes the relationship between these parameters to simply and quickly screen out biomass-derived hard carbon raw materials with good stability, thereby obtaining biomass-derived hard carbon materials with excellent battery cycle stability and good electrochemical performance. When the biomass ash content, sugar content, and coin capacity of the biomass-derived hard carbon after acid treatment satisfy the relationship 10≤α / β×σ≤50, an effective balance between biomass ash and sugar content can be achieved. This balance allows for the formation of a specific porous structure, increasing sodium storage sites and improving sodium ion conductivity, while also preventing excessive ash and impurities from affecting the electrochemical performance of the hard carbon material. This ensures the high energy storage capacity and excellent cycle stability of the hard carbon material.

The invention relates to the technical field of agricultural planting, and particularly discloses a continuous cropping planting method for potatoes. The invention relates to a method for continuous cropping of potatoes, which comprises the following steps of: spreading biomass ash for disinfection before plowing, ditching by adopting a ditch sowing mode after plowing, applying a soil remediation fertilizer according to the dosage of 2000-3000Kg / mu, covering a mulching film on the surface of soil after colonization, and when seedlings enter a tillering stage from resettling to main stem capping and leaf unfolding, covering the mulching film with the soil remediation fertilizer. The leaf fertilizer solution is sprayed on the front and back faces of the potato leaves for the first time through a sprayer, the leaf fertilizer solution is sprayed for the second time after 13-15 days until water films are generated on the leaf surfaces and do not drop, and the leaf fertilizer solution contains nano-selenium and growth hormone. The continuous cropping planting method for the potatoes can be used for overcoming the continuous cropping obstacles of the potatoes and improving the single-plant tuberization number and the nutrient content in tubers of the potatoes planted in the continuous cropping mode of the potatoes.

The invention discloses a method for preparing a flue gas desulfurizer from phosphate tailings cooperating with multiple solid wastes and application thereof, and the method comprises the following steps: calcining phosphate tailing fine powder to obtain calcined phosphate tailings containing calcium oxide and magnesium oxide; mixing the steel slag fine powder, the red mud fine powder, the composite additive, the biomass ash and the calcined phosphate tailings to obtain a mixture; mechanically activating the mixture, and molding to obtain a molded body; and curing the molded body, and then carrying out heat treatment to obtain the flue gas desulfurizer. Through process optimization and pretreatment component compounding, the desulfurizer with a porous skeleton structure taking calcium iron silicate as a main body is constructed, the desulfurizer is high in desulfurization activity, the specific surface area reaches 38-85 m < 2 > / g, the stability is good, and the desulfurizer has excellent mechanical strength and anti-sintering performance, so that the finally prepared desulfurizer maintains high desulfurization efficiency, and the desulfurization effect is good. And the device is suitable for low-temperature and high-sulfur flue gas environments.

The invention provides an eco-friendly fully-degradable material solid waste resource slope restoration method, and relates to the technical field of slope soil governing, the method comprises the following steps: compost fermentation is carried out on decomposed farmyard manure, sawdust, peat soil, steel slag and fly ash to obtain an organic material; mixing nitrogen-fixing bacteria, phosphate solubilizing bacteria and potassium solubilizing bacteria to obtain a complex microbial inoculant; uniformly mixing zeolite powder, gypsum and biomass ash to obtain a soil conditioner; mixing the biomass particles with a water-retaining agent and a complex microbial inoculant to prepare a biomass carrier; mixing the organic material, the complex microbial inoculant, the soil conditioner, the biomass carrier and the water-retaining agent to obtain the soil conditioner; an improved soil layer is laid after the slope is pretreated, and plants are planted on the surface of the improved soil layer. According to the method, the technical problems that plants planted on the slope are difficult to survive and the vegetation planting rate is low are effectively solved.

The invention provides an environment-friendly gravel concrete preparation process which comprises the following steps: mixing low-clinker gel, modified biomass ash and iron powder, and uniformly stirring to obtain a mixture A; then adding the recycled aggregate and the modified sand grains into the mixture A, and uniformly stirring to obtain a mixture B; adding a water reducing agent into the mixture B, and uniformly stirring to obtain a mixture C; and then adding seawater electrolytic calcium carbonate paste into the mixture C, and uniformly stirring to obtain the environment-friendly gravel concrete. The recycled aggregate is prepared by modifying waste concrete blocks. The environment-friendly gravel concrete has good environmental protection property, mechanical strength and working performance.

The application discloses modified biomass ash as well as a preparation method and application thereof, and belongs to the technical field of modified materials. The preparation method of the modified biomass ash comprises the following steps: mixing biomass ash, poultry feather hydrolysate and a flocculating agent, and then drying to obtain the modified biomass ash. The application further provides modified biomass ash prepared by the above preparation method. In addition, the application further provides application of the modified biomass ash prepared by the above preparation method or the modified biomass ash in preparation of a soil conditioner. The modified biomass ash can improve heavy metal contaminated soil and improve the quality of crops.

The invention discloses a basalt fiber reinforced autoclaved concrete slab and a production process thereof, and the basalt fiber reinforced autoclaved concrete slab is prepared from the following components in parts by weight: 200 to 300 parts of ordinary silicate low-carbon cement, 100 to 200 parts of quick lime, 100 to 200 parts of carbide slag, 200 to 300 parts of high-calcium fly ash, 210 to 410 parts of crushed marble powder, 150 to 200 parts of biomass ash, 150 to 200 parts of furnace slag, 50 to 100 parts of granulated blast-furnace slag and 3 to 5 parts of phosphogypsum. The water accounts for 60%-65% of the total mass of the materials, the metal aluminum powder accounts for 0.6%-0.8% of the total mass of the materials containing the water, and the modified basalt fiber accounts for 0.7%-1.2% of the total mass of the materials containing the aluminum powder. The defect that rod-shaped or filament basalt fibers are difficult to install and arrange in a mold is overcome, and the same effect as that of using filaments is achieved by using the technology of automatically connecting the short fibers.

The invention discloses a device and a system for preparing green synthesis gas from biomass, relates to the technical field of preparation of green synthesis gas, and solves the problems that when the green synthesis gas is prepared, biomass ash is easy to melt, and continuous operation of the device and the system is difficult to guarantee. And meanwhile, the problem of low efficiency during preparation of the green synthesis gas is solved. The device for preparing the green synthesis gas from the biomass comprises a conversion device, the pyrolysis oil gas inlet is communicated with one side of the conversion device; the converted gas outlet is communicated with the other side of the conversion device; the catalyst inlet is communicated with the top of the conversion device; the catalyst outlet is communicated with the bottom of the conversion device; and the compressed gas stirring mechanism is arranged in the conversion device. According to the invention, the problem that the biomass is easy to melt due to a low ash melting point can be effectively avoided, the high-oil-content pyrolysis oil gas of the biomass can be efficiently converted into the synthesis gas, meanwhile, a pure oxygen system does not need to be additionally arranged, and the investment and the safety risk of the system are reduced.

The invention belongs to the technical field of harmless treatment of garbage, and particularly relates to a biomass-synergistic household garbage gasifier liquid-state deslagging method which comprises the following steps: component determination: respectively determining ash components of household garbage ash and ash components of biomass ash; fluxing agent selection: selecting one biomass or a biomass mixture obtained by mixing at least two biomasses as a biomass fluxing agent according to ash components of the household garbage ash and the biomass ash; and gasification reaction: mixing the household garbage and the biomass fluxing agent, carrying out gasification reaction on the obtained mixture, and discharging ash. According to the method, the heat value of the gasification raw material is guaranteed, and the FT temperature of the household garbage gasification reaction ash is reduced, so that the requirement for the reaction temperature is reduced, the energy consumption of equipment operation is reduced, the equipment operation cost is reduced, meanwhile, the temperature interval is expanded, the fluctuation temperature of a slag discharging opening is met, smooth liquid slag discharging is achieved, and the equipment operation stability is improved.

The invention relates to a large-dosage biomass ash brick as well as a preparation method and application thereof, and belongs to the technical field of biomass ash bricks. According to the invention, the polypropylene fibers are modified, and sulfonic acid groups and phosphonate groups are grafted on the surfaces of the polypropylene fibers, so that the hydrophilicity of the polypropylene fibers is improved, the polypropylene fibers are more easily infiltrated, agglomeration among the polypropylene fibers is effectively inhibited, and the polypropylene fibers can be uniformly dispersed in a mixture; in addition, phosphonate groups on the surfaces of the polypropylene fibers can effectively improve the loading efficiency of nano-alumina loaded on the surfaces of the polypropylene fibers, and the nano-alumina loaded on the surfaces of the polypropylene fibers can be subjected to a pozzolanic reaction with slaked lime in a cement hydration product, so that the surface of the biomass ash brick is effectively protected. The overall strength of the polypropylene fiber skeleton is effectively improved.

This invention discloses a method for improving tropical acidic soil based on deep tillage and synergistic use of alkaline materials, belonging to the field of agricultural soil improvement technology. This method targets strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0, and includes: deep tillage to a depth of 35-45 cm at a soil moisture content of 15%-20%, with complete return of crushed straw to the field; uniform application of a compound conditioner on the surface, consisting of: 80-120 kg / mu of quicklime, 80-120 kg / mu of biomass ash, and 150-250 kg / mu of calcium-magnesium soil conditioner, wherein the biomass ash is a byproduct of a biomass power plant, and the pH value is 9-10 under a water-to-soil ratio of 1:2.5; and rotary tillage to ensure that the coefficient of variation of the material distribution within the 0-20 cm soil layer is ≤ 12%. This invention utilizes deep tillage and the synergistic effect of three materials in a specific ratio to form a three-level buffer system of "rapid-release-long-lasting effect," achieving rapid improvement and long-term stability of soil pH. It solves the problems of soil compaction and short-lasting effect caused by the application of lime alone, while effectively alleviating deep acidification. It is particularly suitable for strongly acidic paddy soils or dryland soils with an initial pH ≤ 5.0.

The application discloses a carbonate rock powder-based mineral admixture and a preparation method thereof, and relates to the technical field of mineral compositions; the carbonate rock powder-based mineral admixture comprises the following components in proportion by weight: 50-60 parts of carbonate rock powder, 30-40 parts of biomass ash and 10 parts of red mud; the three kinds of bulk solid wastes, i.e., the carbonate rock powder, the biomass ash and the red mud, are compounded, the inherent defects of single carbonate rock powder in the application in concrete are successfully solved, and high-quality and bulk-quantity utilization of multi-source solid wastes are realized; based on the physical and chemical synergistic effect among the components, tight particle packing is realized, when the carbonate rock powder-based mineral admixture is applied in concrete, not only the workability of fresh concrete is ensured, but also the hardened concrete structure is extremely dense, and the mechanical strength, the impermeability, the corrosion resistance and other durability of the hardened concrete structure are improved.

The present application provides a kind of exogenous seaweed ash modified biochar and its preparation method, comprising the following steps: selecting large seaweed biomass and low ash biomass, obtaining the precursor powder to be treated;Large seaweed is calcined under air atmosphere, and the original ash is collected, and the original ash is ground pretreated, to obtain the exogenous ash to be used;Low ash biomass powder and exogenous ash are physically mixed in proportion and fully ground, so that the mineral components in the exogenous ash are uniformly loaded in the biomass matrix;The obtained mixed powder is placed in a protective atmosphere for high-temperature carbonization to prepare biochar;The obtained biochar is mixed with an activating agent at a mass ratio and then subjected to high-temperature activation treatment;After activation, the product is washed with acid, then washed with water until neutral, dried, and the exogenous seaweed ash modified biochar is obtained.The present application solves the problem of dependence on high-pollution chemical agents in the preparation of high-performance carbon materials from low-ash biomass, and realizes the resource utilization of biomass ash.

It is a method for reducing alkali metal from a predetermined woody biomass ash, simply and efficiently. Specifically, a method of heat treating woody biomass ash having a pH of 12.5 or more in water, at ordinary pressure, at 60 to 100 °C.

The application discloses a reversible photothermal evaporator based on biomass ash and biochar as well as a preparation method and application thereof. The evaporator is prepared by dissolving polyvinyl alcohol and chitosan in an acetic acid aqueous solution, mixing biomass ash and biochar to obtain a spraying solution, and spraying the spraying solution on a filter membrane with a reversible polyhedral structure having edges and corners, and then spraying a glutaraldehyde solution to form a hydrogel layer. The photothermal evaporator can be used for seawater desalination and exhibits excellent seawater desalination performance. The core features are as follows. Firstly, the photothermal evaporator can provide an efficient resource utilization path for biomass thermal conversion byproducts. Secondly, the unique reversible structure can realize periodic switching of the working surface during operation, and relying on the self-cleaning mechanism of the alternating cycle, the photothermal evaporator can realize continuous and stable treatment of high-concentration brine, and effectively overcome the performance degradation problem caused by salt accumulation of a traditional solar interface evaporator.

The invention discloses a light-transmitting decorative concrete plate as well as a preparation method and application thereof. The light-transmitting decorative concrete plate comprises a concrete material layer, a glass gridding cloth layer and a light-transmitting regeneration pipe, the glass gridding cloth layer is arranged in the concrete material layer, and the light-transmitting regeneration pipe penetrates through the glass gridding cloth layer and the concrete material layer to form a light-transmitting channel. The waste plastic straws and the biomass ash can be efficiently recycled, and the waste plastic straws and the biomass ash are combined with a concrete material to prepare the concrete plate. The preparation method is environment-friendly, low in cost and easy to popularize and implement, and the prepared concrete plate is excellent in working performance, construction convenience, mechanical property and durability.

The invention relates to the technical field of clean utilization of solid waste resources, in particular to a method for increasing the melting temperature of biomass ash. The method comprises the following steps: mixing sludge and a biomass raw material to obtain a mixture; burning the mixture to obtain a mixed ash sample; wherein the mass ratio of the sludge in the mixture is 20%-80%. According to the method, co-gasification of the sludge and the biomass is utilized, the melting temperature interval of the mixed ash is adjusted by controlling the proportion of the sludge and the biomass, and the melting temperature of the biomass ash is increased. According to the method, additional additives are not needed, and the problems of gas path blockage, equipment damage and the like caused by easy sintering of ash during independent combustion of biomass are solved; meanwhile, by adding sludge with high ash content, an ash layer with a certain thickness can be formed at the bottom of the gasification furnace, direct contact between a high-temperature area of an oxide layer and a material at the bottom of a furnace body is blocked, and equipment damage caused by local overheating is avoided.

The invention discloses a method for improving the mechanical property of a high-sulfur slag filling body by using biomass ash, and belongs to the field of metal mine filling, in the method for improving the mechanical property of the high-sulfur slag filling body, filling slurry is prepared into pasty slurry, the mixing amount of cement is 20% of the total mass of solid, and the mixing amount of water is 20% of the total mass of the solid; the addition amount of the biomass ash is 0-5% of the mass of the added cement. The compressive strength and the tensile strength of the high-sulfur slag filling body prepared by adding a proper amount of biomass ash are remarkably improved, the mechanical property of the high-sulfur slag filling body can be remarkably improved, the expansion strength of the high-sulfur slag filling body is prevented from being degraded, and the method has the advantage of being simple in process; the biomass ash is used as a renewable resource, is wide in source and easy to obtain, is safer, more reliable, economical and environment-friendly in solving way, and is low in cost compared with chemical reagents and synthetic fibers. The biomass ash is applied to the field of mine filling, so that the mechanical property of the high-sulfur slag filling body is improved, resources are reasonably utilized, and environmental protection is facilitated.

The invention belongs to the technical field of environmental protection, and provides a heavy metal stabilizing agent derived from waste incineration fly ash and a use method, the heavy metal stabilizing agent comprises the following components in parts by mass: 40-90 parts of sodium dimethyl dithiocarbamate, 10-50 parts of calcium hydroxide, 1-20 parts of phosphorus-containing waste, and 1-20 parts of biomass ash; the heavy metal stabilizing agent is prepared from phosphorus-containing waste, biomass ash and other low-cost waste resources, the agent cost is greatly reduced, meanwhile, through the synergistic effect of all the components, Pb, Cr, Zn, Cu, Ba and other heavy metals in the waste incineration fly ash can be efficiently solidified, the leaching amount of the heavy metals can be remarkably reduced, the solidification effect is superior to that of the prior art, and the method has good application prospects. The potential harm of heavy metals in the fly ash to the environment is effectively reduced, so that the treated fly ash better meets the treatment standards of landfill and the like, and the method has both economical efficiency and environmental protection property.

The present invention provides a silt solidifying agent and a method of use, which belongs to the field of soil resource utilization, and includes the following components by mass: 4-20 parts of a powder solidifying agent, wherein the powder solidifying agent includes a water absorbent with a mass percentage of 12-16%, a biomass ash with a mass percentage of 26-32%, and a gelling agent with a mass percentage of 55-60%; and 0.1-1 parts of a liquid solidifying agent, wherein the liquid solidifying agent includes a water-based epoxy resin with a mass percentage of 48-54%, a water glass with a mass percentage of 20-26%, a silica sol with a mass percentage of 15-20%, and an aluminum sulfate with a mass percentage of 10-14%. The present invention provides a silt solidifying agent and a method of use, wherein the solidified soil obtained by treating the silt with the silt solidifying agent has adjustable strength, controllable construction quality, and can meet different foundation bearing capacity requirements by adjusting the proportion of the silt solidifying agent. Compared with the chemical solidification improvement method, the amount of silt solidifying agent used is small, and the composite foundation formed after the silt solidifies has a high bearing capacity and small post-construction settlement, and can be used as the underlying layer of the foundation.

The invention discloses a composite microbial agent for soil improvement and a preparation method thereof, and relates to the technical field of microbial agent preparation, the composite microbial agent comprises the following raw materials: a composite carrier, a functional material, modified xanthan gum, a strain fermentation broth and an adhesive; according to the invention, the composite carrier is added, silica sol-biomass ash modified bentonite provides a stable shelter for viable bacteria by virtue of a nano coating structure, and the composite carrier has the functions of water retention, stress resistance and heavy metal passivation; the charcoal provides a carbon source with a high specific surface area and improves the soil porosity; humic acid can adjust the pH value of soil and promote rhizosphere colonization of strains; the nano kaolin enhances the adsorption performance of the carrier through the original nano particle size, and Al < 3 + > is separated out to participate in the cross-linking reaction of the modified xanthan gum; the soil conditioner is high in viable bacterium loading rate, the granular structure and nutrient adsorption capacity of the soil are remarkably improved through the synergistic effect of all the components, and the soil conditioner is good in compatibility with strain fermentation liquor and functional materials and can adapt to various soil types such as acidity, salt and alkali, heavy metal pollution and the like.