2032 results about "Spontaneous combustion" patented technology

The invention discloses a thick seam large mining height working face gob-side entry retaining method, wherein a flexible yield airbag is installed on the deformed space retained on the top part of the filling body besides the lane; the height of the filled airbag is equal to the prediction value of the sinking quantity of the top plate; the airbag is filled with air, the inflation pressure is 3MPa; a one-way decompression valve is installed on the bag body and the decompression pressure is 4MPa. The flexible yield airbag is arranged, thus on the one hand, effectively protecting the filling body besides the lane and achieving the purpose of gob-side entry retaining, and on the other hand, preventing the coal in the gob from spontaneous combustion, ensuring safe production and simultaneously improving the mining coefficient of the coal.

The invention discloses a method for filling solid and recovering and fully mechanizing room type coal pillars, comprising the following steps of: reinforcing and supporting a coal pillar and a coal room top plate in a pre-recovering room type coal pillar area and suspending and hanging a wind curtain to form a solid substance haulage drift and a coal haulage drift which are connected with a large haulage drift; recovering the coal pillars by the conventional method, starting matching equipment after cutting a coal interval and transporting the solid substances to a goaf from the ground for filing and tamping; and cutting coal of next coal interval and filling the goaf, repeating the steps until finishing the recovery of all room type coal pillars. The method not only solves the problems that unstable coal pillar causes the safety accidents due to the superposition of stress of the front part and two sides of a workface because of the recovery of the traditional coal pillar, but also eliminates the potential safety trouble caused by the hurricane, large-area sinking and the like caused by the spontaneous combustion of the room type coal pillar and the large-area caving of hard top plates in the goaf. The invention has simple method, high production efficiency, low cost and over 85 percent of the recovery rate of the coal pillars.

The invention discloses an environment-friendly flame-retardant high-molecular gel inhibitor for preventing coal from spontaneously combusting of coal mine, which takes water as a solvent and comprises the following components with percentage concentration by weight: 7-10 percent of high-molecular base material, 0.1-0.5 percent of inorganic inhibitor, 0.1-0.5 percent of flame retardant agent, 0.01-0.5 percent of surface active agent and 0.1-3 percent of reinforcing agent. The environment-friendly flame-retardant high-molecular gel inhibitor has the advantages of simple operation, good wall-absorbing property and inhibiting effect, flame retardant property and environment protection; a coating layer can bear the action of flame for a plurality of times and has large mechanical strength, and a coating film is stable and does not fall off in the humid environment. In the process of coal mining, the inhibitor solution is sprayed to superficial coal and combustible areas behind a coal-mining working surface and the spontaneous combustion tendency of coal can be reduced, therefore, the environment-friendly flame-retardant high-molecular gel inhibitor prevents the spontaneous combustion of coal thoroughly and is applicable to the operation under a mine and coal storage.

The invention relates to a preparation method of multi-phase gel foam for controlling the spontaneous combustion of coal. The multi-phase gel foam with multiple components of medium is made by adding a slight amount of thickener into the fly ash or the yellow mud slurry to form thickening mud with certain viscosity, adding certain amount of cross-linking agent and foaming agent into the thickening mud, and introducing nitrogen to carry out the physical and mechanical foaming. The bubble wall of the multi-phase gel foam has high viscosity and good elasticity, the fly ash or yellow mud adhere to the bubble wall, and the bubble is internally covered with nitrogen. The multi-phase gel foam is delivered to the mined-out area through the grouting pipeline of the mine, evenly covers the float coal in the mined-out area, and blocks the fractures of the coal body. The method can effectively hinder the oxygen absorption for goal and prevent the oxidization of the coal. The preparation method is simple, and the prepared multi-phase gel foam has low cost and significant effects on fire prevention and extinguishing; the preparation method does not only have the advantages of mud injection, nitrogen injection, two-phase foam injection, gel injection and composite gel injection on fire prevention and extinguishing, and also overcomes the deficiency, which has wide practicality.

The invention discloses a test device for high-pressure combustible gas leakage spontaneous combustion and shock wave induction ignition. The whole test device comprises a test gas bottle, a nitrogen gas bottle, a high-pressure ventilating pipeline, a pressure stabilization valve, an electromagnetic valve, a pressure gauge, a vacuum pump, a high-pressure storage tank, a pressure transducer, an ICP (inductively coupled plasma) pressure sensor, a photoelectric diode, a rupture disk clamp (in which a rupture disk is arranged), downstream pipelines, a schlieren, a high-speed camera, a protection box, an air compressor and the like. The device can be used for (1) researching the influence of factors, such as different leakage pressures, shapes, lengths and diameters of different downstream pipelines, the gas initial temperature, a breakage shape of the rupture disk and obstacles outside an orifice, on the spontaneous combustion ignition, and further completing a spontaneous combustion ignition mechanism; (2) researching a shock wave induction ignition process and disclosing a shock wave induction ignition mechanism and influence factors thereof; (3) realizing the visible research on spontaneous combustion ignition and shock wave induction processes.

A method for supporting and protecting gob roadway walls built along the gob road-way is characterized in that the filling bodies of gob roadway walls are built along the working surface at the side of the goaf to establish a supporting and protecting belt for gob roadway walls. The method can effectively control the roof delamination of a direct roof and can timely cut off the roof and the lower basic roof and also can fill out goaf with the falling recrement, thereby reducing the bending of the basic roof, and the loading of the inner supporting and protecting structure and the deformation of the wall rock of the gob roadway, as well as keeping the stability of the gob roadway, meanwhile, the method also can seal the goaf, prevent air leaking and spontaneous combustion of coal, and avoid harmful air coming into the working area.

The invention relates to a composite gel inhibitor for preventing and controlling spontaneous combustion of coal in a coal mine and a preparation method thereof. The composite gel inhibitor provided by the invention comprises the following components in percentage by weight: 10 to 65.0 percent of graft copolymer, 0 to 4.00 percent of flame retardant, 20 to 60.0 percent of water glass, and the balance of water. The graft copolymer containing a -COOH functional group is obtained by adopting a water soluble polymer and unsaturated carboxylic acid monomers to perform graft copolymerization, and the composite gel inhibitor for preventing and controlling the spontaneous combustion of the coal in the coal mine is obtained by adding the flame retardant and the water glass into the graft copolymer. The flame retardant provided by the invention has the advantages of excellent retarding effect, environmental friendliness and the like.

The invention discloses a composite biological activated carbon and a rapid preparation method thereof, raw materials thereof comprise coconut shell, bamboo, rice hull, sawdust, wheat straw or rice straw, or the raw materials thereof comprise the rice hull, the sawdust, the wheat straw or the rice straw, corn stalk or corn core, the raw materials are smashed to prepare columnar granules, the direct heating method of the spontaneous combustion type granules is adopted for preparing the carbon, a fixed layer is paved at the bottom of a furnace by taking the granules as the raw materials, the fixed layer is ignited by using ignition materials, the feeding is adopted at the upper part of the furnace and the air induction is carried out at the lower part of the furnace for accelerating carbonization of the granules, the air induction is stopped after the carbonization of the granules, the temperature in the furnace is kept at 430-700 DEG C, the spray cooling method is adopted for activatingand cooling the granular carbon, and a finished product is prepared after 20-30 minutes. A plurality of raw materials are mixed, and more pores are naturally formed, thereby expanding the specific surface area of the carbon, greatly increasing effective micropores, leading the absorption performance to be greatly better than the existing activated carbon of single material and reflecting the unique advantages of the composite material.

The invention provides a filling-reclaiming method for building land in coal mining subsidence areas, which belongs to the technical field of mining and is used to solve the problem of developing and utilizing coal gangue. The invention adopts a technical scheme that the method is implemented according to the following steps: a, draining accumulated water in reclamation areas and clearing silt; b, striping and stockpiling surface soil; c, determining the thickness and density of coal gangue for hierarchical backfilling through a vibration pressure test; and d, performing hierarchical backfilling compaction on the coal gangue and soil. The method has the following main advantages that: 1, the ways of utilizing the coal gangue are expanded, and environmental pollution caused by stockpiling the coal gangue on ground is reduced; 2, the situation that building land is increasingly short is alleviated by reclaiming subsidence land to be the building land; and 3, the treatment for coal gangue for large-area hierarchical backfilling by a hierarchical vibration-compaction method is economical, reasonable and ideal in compaction effect, can improve the compactness and bearing capacity of coal gangue layers, and can prevent the spontaneous combustion or efflorescence of coal gangue foundations and the separation of harmful substances from polluting local environment because hierarchical compaction greatly reduces porosity and isolates air.

The invention discloses a sparking plug ignition-type premixing compression ignition system of an internal combustion engine, and belongs to the technical field of combustion of internal combustion engines. According to the premixing compression ignition system, a high-energy sparking plug is adopted for igniting diesel oil or igniting mixtures of the diesel oil and other fuels, wherein the dieseloil or the mixtures serve as the fuels for premixing and are jetted out in a gas feeding process or a compression process to generate premixing gas in a combustion chamber. By adopting an effective compression ratio under which the premixing gas cannot be ignited, the premixing gas in a cylinder cannot burn spontaneously; by using the high-energy sparking plug for ignition close to a compressionupper limit point, the mixed gas nearby the sparking plug is ignited to make the temperature and the pressure in the cylinder quickly rise, the other remaining premixing gas in the cylinder satisfiesthe conditions for spontaneous combustion, large-scale multi-point spontaneous combustion happens, and fast combustion of the premixing gas is achieved. By adopting a high expansion ratio, the heat efficiency is further improved.

The invention particularly discloses a construction method for a mine shaft through multilayer goaf, which solves the problem of blankness of the construction method for the conventional mine shaft through goaf. The method comprises the following steps that: 1) the ground and the underground space of the goaf are detected; 2) mechanical analysis is performed on a rock stratum of the goaf; 3) a goaf filling range and filler mechanical property are determined; 4) bedrock is tunneled; 5) a related underground chamber which is integrally connected with a shaft is constructed; and 6) the goaf is filled and reinforced. The construction method fills the blank of the construction method for the shaft through goaf; back filling injection, filling and reinforcing technology is used during the construction of a through goaf of a vertical shaft; the construction method has an advanced, economic and rational technology; the goaf can be completely closed; return current is prevented from entering the goaf, so a coal seam of the goaf has a tendency to spontaneous combustion; thus safe and reliable use of the shaft is guaranteed.

The invention discloses a pulverized fuel ash-cement foam material for controlling the spontaneous combustion of coal and a preparation method of the pulverized fuel ash-cement foam material. The pulverized fuel ash-cement foam material is prepared from the following components by weight: 10-40 % of sulfoaluminate superfine cement, 10-40 % of pulverized fuel ash, 0.5-0.9 % of carboxymethyl cellulose, 0.1-0.6 % of sodium fluoride, 0.2-0.6 % of melamine, 0.1-0.4 % of aluminum sulfate, 0.3-0.6 % of lauryl sodium sulfate, 0.4-0.6 % of sodium dodecyl benzene sulfonate, 0.5-0.8 % of saponin and the balance of water. The foam material is high in expansion rate of foam, long in stabilizing time, low in rate of water loss, good in plugging performance, and very suitable for extinguishment underground a coal mine. The pulverized fuel ash-cement foam material has the advantages of being low in cost, good in plugging performance, high in strength, simple to construct and the like.

An embodiment of the invention provides a novel power battery heath management system. The novel power battery heath management system comprises a power battery, a data acquisition module, a data management module and an equalization control module, wherein the data acquisition module is used for collecting the current electric parameters of the power battery in real time and the sending the current electric parameters to the data management module; the data management module is used for determining index data according to the current electric parameters, generating an instruction signal according to the index data, and sending the instruction signal to the equalization control module; and the equalization control module is used for carrying out equalization control on the power battery according to the instruction signal. According to the embodiment of the invention, the equalization control of the power battery is carried out according to the current electric parameters collected in real time, so that the conditions that the service life of the power battery is shortened or the power battery is subjected to spontaneous combustion caused by the reason that certain single batteries are constantly over-charged or over-discharged due to unbalanced electric quantities among the single batteries are avoided; and consequently, the service life of the battery is prolonged, and the safety of the power battery is improved.

The invention discloses an inorganic salt type inhibitor for preventing and controlling spontaneous combustion of residual coal in a goaf of a coal mine, which belongs to the field of fire prevention and extinguishment in the goaf of the coal mine. The inorganic salt type inhibitor consists of sodium bicarbonate, calcium bicarbonate, calcium chloride, magnesium chloride, sodium chloride and zinc chloride according to a certain proportion by weight. The average inhibiting rate of the inorganic salt type inhibitor can achieve 85%, and the inhibiting effect is ideal. When in use, the inhibitor is covered on the surface of the residual coal in the goaf, thereby achieving the effects of preventing and controlling the spontaneous combustion of a coal layer in the region for a long time. The dusting method of the inorganic salt type inhibitor for fire prevention and extinguishment is safe and stable, the process flow is simple, the operation is convenient, the initial investment is low, and the using cost is relatively low. The fire prevention and extinguishment technology of the inorganic salt type inhibitor which has thermal instability and can release inert gas carbon dioxide has broad application prospects in the work of preventing and controlling the spontaneous combustion fire disasters of the coal layers. The inorganic salt type inhibitor is applicable to the fire prevention and extinguishment in the goaf of the coal mine.

This invention is a process for the passivation or deactivation with respect to oxygen of a carbonaceous material by the exposure of the carbonaceous material to an oxygenated gas in which the oxygenated gas pressure is increased from a first pressure to a second pressure and then the pressure is changed to a third pressure. Preferably a cyclic process which comprises exposing the carbonaceous material to the gas at low pressure and increasing the pressure to a second higher pressure and then returning the pressure to a lower pressure is used. The cycle is repeated at least twice wherein the higher pressure may be increased after a selected number of cycles.

The invention relates to a testing device for simulating spontaneous combustion and fire extinguishment processes of coal. The main structure of the testing device is composed of a reaction kettle, a heating layer, an asbestos thermal insulating layer, a microwave generator, a base, a kettle cover, a gas filter screen, an intake valve, an intake pipe, an exhaust valve, an exhaust pipe, a temperature sensor, an electric cabinet, a control panel, a display screen, an indicator lamp, a power switch, a microwave controller, a measurement regulator, a control circuit board, an oxygen bottle, a nitrogen bottle and a lead, wherein the reaction kettle is employed for heating and preserving heat; the temperature sensor acquires information, and testing indicator gases in the spontaneous combustion and fire extinguishment processes of coal; oxygen is introduced to simulate spontaneous combustion, while the nitrogen is introduced to perform a fire extinguishing test, so that the change rules of the indicator gases of the spontaneous combustion and fire extinguishment processes of coal are obtained; as a result, scientific data is provided for spontaneous combustion fire prevention and extinguishment; besides, the device is advanced and rational in design, compact in structure, safe, stable and reliable, convenient to operate and use, widely applicable to many test and experiment items, high in test accuracy and short in test time.

The invention relates to a lean oil direct injection and mixing low-pollution combustion chamber. The lean oil direct injection and mixing low-pollution combustion chamber is composed of a diffuser, acombustion chamber outer case, a combustion chamber inner case, a combustion chamber head, a flame tube outer wall and a flame tube inner wall, wherein combustion air all enters a flame tube from thecombustion chamber head; the combustion chamber head is divided into an on-duty grade and a main combustion grade through a grading and partitioning combustion strategy; the on-duty grade and the main combustion grade both adopt a direct injection and mixing combustion method, the phenomena of spontaneous combustion and tempering are effectively avoided, and the risk of occurrence of oscillationcombustion is lowered; the lean oil direct injection and mixing low-pollution combustion chamber only works in an on-duty grade mode under an idling rating state, the designed partial equivalence ratio is higher, and the work stability of the combustion chamber is guaranteed; and with the increase of the work state of the combustion chamber, the main combustion grade is opened gradually, the maincombustion grade and the on-duty grade work simultaneously under a large state, the designed combustion area average equivalence ratio is lower, the average temperature of the combustion area is effectively lowered, and therefore the generation quantity of pollutants is lowered.

The invention discloses a fireproof high-molecular compound colloid material for coal mines, which belongs to fireproof materials. The fireproof high-molecular compound colloid material is compounded from 40-100 portions of high-molecular compound and 52-98 portions of an inorganic material, wherein the high-molecular compound is polyacrylate, or is composed of 40-55 portions of polyacrylate, 0-30 portions of carboxymethyl cellulose and 0-15 portions of polyacrylamide; the inorganic material is composed of 30-50 portions of bentonite, 12-18 portions of alumina shale powder, 10-20 portions of kaolin, 0-5 portions of attapulgite and 0-5 portions of clay; and the fineness of each raw material is less than 120 um. The preparation method of the colloid material comprises the following steps: mixing the high-molecular compound for 3-5 minutes; and after respectively spraying the inorganic material on a dry mixer, sufficiently and uniformly mixing the 8 materials for 8-10 minutes. The colloid material has the advantages of high water content, high moisture retention, high heat absorption capacity, quick fireproof effect taking, favorable effect, low possibility of afterburning and low composite cost, and is suitable for preventing and controlling fire for the spontaneous combustion and inflammation laws of different types of coal; and the downhole operation is simple and safe.

The invention relates to a method for determining air-leakage rate of an oxidized zone of goaf, and belongs to the technical field of coal mine downhole spontaneous combustion disaster prevention. The method includes firstly, determining nitrogen injection flow rate; secondly, burying beam tubes for gas component measurement in the goaf to determine change of concentration of oxygen; thirdly, establishing a numerical computing module, and determining concentration distribution of oxygen in the goaf and the air-leakage rate on the condition without nitrogen injection by a numerical simulation process; fourthly, performing a thermogravimetric experiment to coal samples sampled from the work face, acquiring oxygen concentration on the condition without weight gaining, and serving the oxygen concentration as an inerting fireproof index of the goaf; fifthly, dividing the spontaneous combustion three-zone of the goaf; sixthly, selecting the widest section of the oxidized zone in the goaf, simulating dividing results of the spontaneous combustion three-zone of the goaf to determine the boundary according to a fitted equation of field real-time measured oxygen concentration distribution results, and solving the average oxygen concentration of the section in the oxidized zone; seventhly, determining nitrogen purity in an actual nitrogen injection process of the work face; and eighthly, determining the air-leakage rate of the oxidized zone of the goaf according to a nitrogen injection quantity calculation formula.

A process, system and apparatus is provided for passivating carbonaceous material against spontaneous combustion. The process involves drying the carbonaceous material in a low oxygen environment and pre-conditioning the carbonaceous material by contacting it with volatile matter contained in a countercurrent gas stream. The volatile matter coats the particles of dried carbonaceous material and plugs the micropores of the dried carbonaceous material, thereby passivating it against adsorption of water and oxygen, and thus spontaneous combustion. The pre-conditioned dried material then undergoes devolatilisation at temperatures at which volatile matter is evolved. The evolved volatile matter mixes with the countercurrent gas stream and is used to pre-condition dried carbonaceous material located upstream.

The invention belongs to a spontaneous combustion easiness judgment method of coal, in particular to a spontaneous combustion danger judgment method of the coal. The method includes the following steps: 1. sampling: a coal sample is collected on a coal working face, sealed and then taken back to a laboratory; the coal sample is ground to be below 50 mesh in the laboratory and put into a dry and clean jar which is labeled; the label will indicate the sampling place and the coal sample preparation time; the jar is sealed by a rubber sleeve; 2. testing: an experiment is taken by a thermogravimetric analyzer; during the experiment, temperature control and data collection are completed by the thermogravimetric analyzer; 3. operation and calculation: calculation of the reaction activation energy is according to an Arrhenius equation; the judgment method is to judge the spontaneous combustion easiness of the coal by the ''ignition activation energy'' in oxidation spontaneous combustion reaction between the coal and the oxygen, without need of a lot of equipments and instruments; the analysis and judgment can be conducted only by one thermogravimetric analyzer; the judging reliability is high.

The invention discloses a rare earth perovskite type oxide catalyst and a preparation method thereof. The general formula of the catalyst is La1-xCuxBO3, wherein x is within 0.05 to 0.5, and B is Fe, Co, Ni, Cr and Mn or the combination thereof. Nitrates of elements that La, Cu and B stand for are dissolved into water to form mixed solution, ammonia water is added after citric acid is added and dissolved, the mixed solution is then heated into wet gel, the wet gel is dried into dried gel, the dried gel is heated for spontaneous combustion, and obtained ash powder is roasted into the rare earth perovskite type oxide catalyst. The elements La and Cu in the catalyst are located at the position A of the perovskite type structure, and the elements Fe, Co, Ni, Cr or Mn are located at the position B. The oxide catalyst has ideal purifying effect for NO, CO and HC in tail gas of an internal combustion engine.

The invention discloses an all-fiber coal mine safety monitoring system which comprises a broadband light source, an optical fiber circulator, a multi-way optical switch array, an optical fiber sensing module and a signal acquisition and processing module, wherein the optical fiber sensing module comprises an optical grating spontaneous combustion monitoring sensor, an optical grating reinforcement ground bean sensor and an optical grating mine earthquake sensor. According to the system, comprehensive information of underground coal mine temperature, strain, mine earthquake and the like can be monitored in real time by the broadband light source; rich database information is provided for comprehensive evaluation of health conditions of underground coal mine by an all-fiber multi-sensor fusion mode; the system is suitable for meeting the monitoring requirements of a severe environment.

The invention discloses a thermosensitive microencapsulation retarder for preventing and controlling spontaneous combustion of coal and a preparing method of the retarder. The retarder comprises corematerials and a wall material coating the core materials; the core materials are prepared from, by weight, 85-90% of catechin, 5-8% of ascorbic acid and 2-10% of anthocyanin, and the wall material ispolyethylene glycol. The preparing method comprises the steps of firstly, heating the wall material to be molten, grinding the core materials into fine powder, then adding the core materials into thewall material in the molten state in batch until the mass ratio of the wall material to the core materials reaches the standard, then adding a thickener and a cross-linking agent, after the materialsare fully mixed, slowly cooling a mixed system until a solid product is obtained, and finally, crushing and sieving the solid product to obtain the thermosensitive microencapsulation retarder. The retarder is rich in source of preparation raw materials, environmentally friendly, simple in preparing technology, low in cost, good in thermal stability, low in water-absorbing property and convenient to store, the retarding efficiency is improved, the retarding time is shortened, and the retarder helps to achieve efficient prevention and control of the spontaneous combustion of the coal.

The invention provides an automatic early warning fire extinguishing method for preventing a vehicle from spontaneously combusting. The inside of an engine case is provided with a central processing unit, a temperature sensor, a gas sensitive sensor, a laser probe, a photoelectric smoke sensor, a direct current over-current protector, a power relay, an oil circuit switch and a fire extinguisher. The central processing unit is connected with the temperature sensor, the gas sensitive sensor, the laser probe, the photoelectric smoke sensor, the direct current over-current protector, the power relay, the oil circuit switch and the fire extinguisher through a data wire to form a detection early warning fire extinguishing system; the outside of an oil supply pipeline which is connected with an engine is covered with a transparent plastic pipe; an oil absorption discoloration flame retardant material is filled between the oil supply pipeline and the transparent plastic pie to form an oil supply pipeline protection structure; and a brake oil tank and an engine oil tank which are arranged at the periphery of the engine are isolated through a flame retardant plate. The automatic early warning fire extinguishing method has the advantages that: the design is scientific and rational; the method gives priority to preventing the pipeline from oil leakage and short circuit, and is supplemented by the passive fire extinguishing; and even though the spontaneous combustion is caused by the fire of the circuit after the oil leaks, the central processing unit can cut off the power relay and the oil circuit switch as soon as possible, so the loss of the spontaneous combustion is minimized.

The invention relates to the technical field of coal mine safety and aims to avoid spontaneous combustion caused by goaf float coal floating and heating of the caving face in the initial mining stage. The invention discloses a fully-mechanized top-coal caving face initial-mining-stage goaf fire prevention and extinguishment method which comprises the following steps: determining areas which can easily produce spontaneous combustion in the fully-mechanized top-coal caving face goaf, and taking measures for fire prevention and extinguishment, wherein the areas which can easily produce spontaneous combustion are determined by a horizontal three-zone and vertical three-zone division method, and the measures for fire prevention and extinguishment are mist obstruction spraying and target filling. The invention has obvious effect on goaf spontaneous combustion caused by goaf crushed medium oxidation and heating in the fully-mechanized top-coal caving face mixing stage, especially the caving face initial mining stage with low movement velocity. The method is simple to operate, and the equipment is convenient to install; and thus, the invention can effective prevent and extinguish goaf natural inflammation along with the movement of the caving face.

The invention discloses a preparation method for directly preparing a high-frequency low-power-consumption material by nanocrystalline MnZn ferrite particles and belongs to the preparation technical field of ferrite magnetic materials. The preparation method comprises the following operation steps: step one: preparing nanocrystalline MnZn powder; step two: pressing into annular biscuit; and step three: sintering into a product. The biscuit pressed in the step two is put in a vacuum furnace, balanced oxygen partial pressure protection is adopted for the biscuit in the heat preservation and cooling processes, and finally the biscuit is naturally cooled to room temperature, thus obtaining the high-frequency low-power-consumption MnZn ferrite. The key point of the preparation lies in combination of quick heating and slow heating in the heating process, which is favorable for elimination and densification of air holes, and causes the crystal particles to be uniform in the processes of slow heating and heat preservation. In the method, the nanocrystalline MnZn powder is prepared by adopting a sol-gel spontaneous combustion method by direct sintering without a presintering re-ball milling process, the cycle is short and the process is relatively simple, thus reducing energy consumption and lowering labor cost. The nanocrystalline MnZn powder particles prepared by the sol-gel method have the advantages of even particles, huge activity, even and non-segregating components and high yield.

The invention relates to a preparation method for a novel carbon pottery composite absorption material, comprising raw material preparation, kneading and forming, drying, high temperature activation and post treatment. By adopting a coke burning process to replace the present burning ceramic technology to prepare carbon pottery, the preparation method for a novel carbon pottery composite absorption material shortens the process period greatly as the temperature rising rate is improved and the activation temperature is reduced, thus being good for transforming the charcoal into activated carbon as well as for improving the yield and performance of the product and reducing the cost simultaneously. The prepared novel carbon pottery complex absorption material also has the advantages of water resistance, no spontaneous combustion, high intensity and large specific surface area.