8results about How to "High carbon yield" patented technology

This invention provides a road petroleum asphalt-based hard-soft carbon composite material, the raw materials of which include road petroleum asphalt, light component small molecule stabilizer, heavy component small molecule oxidant, activator, and solvent; and the ratio of road petroleum asphalt:solvent:light component small molecule stabilizer:heavy component small molecule oxidant:activator is 1:15-25:0.05-0.2:0.05-0.2:2-5, calculated in g / mL / g / g / g. Furthermore, this invention also provides a method for preparing the aforementioned hard-soft carbon composite material, which includes the following steps: crosslinking treatment of the light component, crosslinking treatment of the heavy component, activation, and carbonization. This invention solves the problem in the prior art where the high price or low carbon yield of hard carbon precursors, high cost of oxidants, or complex overall formulations lead to high costs for the prepared asphalt-based sodium-ion battery anode carbon materials. The hard-soft carbon composite material of this invention not only has a lower cost but also combines the advantages of both hard and soft carbon, exhibiting high sodium storage capacity, high reversible specific capacity, high initial charge-discharge efficiency, and good cycle performance.

The invention relates to the technical field of electrochemistry, and discloses a negative electrode active material and preparation and application thereof, a sodium-ion battery negative electrode material, a sodium-ion battery negative electrode and application, and the method comprises the following steps: (1) mixing a petroleum-based material and a hard carbon precursor with a solvent to obtain mixed slurry; (2) drying the mixed slurry obtained in the step (1); (3) performing pretreatment and high-temperature carbonization on the product in the step (2) to obtain a negative active material; wherein the mass ratio of the petroleum-based material to the hard carbon precursor in the step (1) is (0.1-4): 1. The preparation method of the negative electrode active material adopts a mode of compounding a petroleum-based material and a hard carbon precursor, and is simple and easy for industrial amplification; meanwhile, the common advantages of the two materials are achieved, the overall carbon production rate is increased, and the reversible capacity and the first-week coulombic efficiency of the negative electrode of the sodium-ion battery can be jointly improved.

The present application relates to a kind of contaminated straw fast carbonization detoxification method, comprising the following steps: S1: collecting contaminated straw;S2: contaminated straw is chopped to less than 2cm;S3: chopped straw is dried to moisture content is less than 15%;S4: drying straw is carried out first fast pyrolysis and obtains carbonized straw, flue gas is handled after passing through front condensation recovery purification system by fan and is recycled in second heating device;S5: carbonized straw is carried out second fast pyrolysis and obtains detoxification carbonized straw, flue gas is handled after passing through rear condensation recovery purification system;S6: front condensation recovery purification system and rear condensation recovery purification system collect heavy metal in flue gas and reuse flue gas.The present application also relates to a kind of contaminated straw fast carbonization detoxification equipment.The present application realizes the efficient detoxification recovery of heavy metal in straw by two high-temperature fast pyrolysis, belongs to the technical field of agricultural and forestry waste resource utilization.

The utility model discloses dry distillation carbonization equipment which comprises a carbonization furnace, the carbonization furnace comprises a furnace body and a furnace pipe which is detachably arranged in the furnace body; the furnace body is hermetically connected with the furnace pipe; a sealing cover is arranged at the top of the furnace; a plurality of exhaust holes are formed in the bottom of the furnace pipe; a smoke exhaust pipeline is arranged at the upper part outside the furnace body; a furnace door is arranged on the lower portion outside the furnace body. According to the utility model, the exhaust holes are formed in the bottom of the furnace pipe, so that wood vinegar, wood tar and combustible gas generated during carbonization of charcoal raw materials are discharged through the exhaust holes in the bottom of the furnace pipe and are directly contacted with open fire in the furnace body to be fully combusted, and the problem of safety accidents caused by pipeline blockage of the carbonization furnace can be effectively solved; and the use efficiency of equipment and the charcoal production efficiency are improved, and meanwhile, the retention time of high-temperature gas in the furnace pipe can be prolonged, so that the heat utilization rate and the heating uniformity can be improved, the quality consistency of charcoal can be ensured, and the charcoal content and the charcoal yield are improved.

This invention belongs to the field of environmental engineering technology, and specifically discloses a method for treating phytoremediation-derived biomass containing heavy metals. This method utilizes bone meal to immobilize heavy metals in the biomass through a co-hydrothermal process, controlling the leaching of Cd within a safe threshold range and Zn far below the safe threshold. This ensures that the resulting hydrothermal carbon composite material does not pose an ecological risk due to excessive heavy metal release. Furthermore, the hydrothermal carbon composite material obtained by this method possesses characteristics such as uniformity, porosity, and a large specific surface area, exhibiting excellent heavy metal adsorption capacity, thus enabling its reuse as a soil remediation agent. This method eliminates the need for separating heavy metals from the phytoremediation-derived biomass, is simple in process, and avoids problems such as acid washing wastewater pollution and treatment.

This invention relates to the field of electrochemical technology, and discloses a negative electrode active material and its preparation and application, as well as a sodium-ion battery negative electrode material and sodium-ion battery negative electrode and its application. The method includes the following steps: (1) mixing a petroleum-based material and a hard carbon precursor with a solvent to obtain a mixed slurry; (2) drying the mixed slurry obtained in step (1); (3) pretreating and carbonizing the product of step (2) at high temperature to obtain the negative electrode active material; wherein, the mass ratio of the petroleum-based material and the hard carbon precursor in step (1) is 0.1-4:1. The preparation method of this negative electrode active material adopts a composite method of petroleum-based material and hard carbon precursor, which is simple to prepare and easy to scale up industrially; at the same time, it combines the advantages of both materials, improves the overall carbon production rate, and can achieve a combined improvement in the reversible capacity and first-cycle coulombic efficiency of sodium-ion battery negative electrode.

The invention relates to a preparation method and application of a modified epoxy resin-based hard carbon negative electrode material, in particular to a hard carbon negative electrode material obtained by deriving diammonium hydrogen phosphate serving as a curing cross-linking agent and a nitrogen and phosphorus atom doping agent of epoxy resin. The preparation method mainly comprises the following steps: dispersing epoxy resin and diammonium hydrogen phosphate in deionized water, uniformly mixing, then placing the mixture in an air dry oven for curing and crosslinking, then placing the cured epoxy resin in a tubular furnace in an inert atmosphere, and sequentially carrying out low-temperature pre-carbonization and high-temperature carbonization, and finally, carrying out ball milling treatment on the obtained product to obtain the modified epoxy resin-based hard carbon negative electrode material. The process for preparing the epoxy resin-based hard carbon negative electrode material is environment-friendly, the process is simple, the carbonization yield is obviously improved, and the electrochemical test shows that the hard carbon material prepared by the method has relatively high first coulombic efficiency and reversible capacity. The method plays a positive role in promoting wide application of the sodium ion battery in the new energy industry.

This invention discloses a method for producing porous biomass carbon using Casuarina equisetifolia. The method involves reactively extruding Casuarina equisetifolia powder, ammonium polyphosphate, melamine, potassium acetate, urea, and water using a twin-screw extruder to obtain a rheological phase plasticizing precursor. This precursor is then refined through segmented curing and foaming, high-temperature reforming activation, hot water digestion, and ultrasonic acid washing to obtain porous biomass carbon. This invention utilizes a eutectic system to achieve low-temperature continuous processing of the precursor and inhibits equipment corrosion. A well-developed pore structure is constructed through a stepwise cross-linking foaming and mild activation strategy. The porous biomass carbon prepared by this invention has an ash content ≤1.12%, a carbon yield ≥35.7%, an iodine adsorption value ≥1278 mg / g, and a methylene blue adsorption value ≥175 mg / g. Furthermore, the process is continuous, with minimal equipment corrosion, making it suitable for industrial production.