159results about How to "Realize resource utilization" patented technology

The invention discloses a method for treating incinerated fly ash of domestic garbage with cooperation of a cement kiln, which comprises the following steps of: 1) washing and pre-treating the fly ash, 2) treating sewage, and 3) calcining cement clinker, wherein the process of washing and pre-treating the fly ash in the step 1) comprises a step of washing the fly ash by using a three-stage washing treatment device consisting of a washing tank and a vacuum filter, and the water and the fly ash are mixed in a weight ratio of 2:1-3:1; the process of treating the sewage in the step 2) comprises steps of desalting supernate and returning the purified condensate water to the step 1) to perform repeated washing so as to realize water recycle; and when the cement clinker is calcined in the step 3), the calcining temperature in the cement kiln can reach 1,750 DEG C. Therefore, the method can ensure that heavy metal ions in the treated fly ash are effectively fixed in crystal lattices of the cement clinker and dioxin is totally decomposed, and realizes hazard-free and reclamation treatment of the fly ash; and the calcined cement can reach the physical and mechanical properties of P.O42.5 cement.

The invention relates to the field of treatment of plant fibers and particularly relates to a method for separating cellulose and lignin from a plant fiber raw material by utilizing ion liquid. According to the invention, the method comprises the following steps of: 1) mixing DMSO (Dimethylsulfoxide) and the ion liquid according to a mass ratio of 1: 4-9 to be used as a solvent, and adding the plant fiber raw material; 2) dissolving at 80 to 140 DEG C for 4-48 hours to obtain a reaction mixed liquid; 3) filtering and separating the reaction mixed liquid by a stainless steel filter screen or a nylon filter cloth, adding water into the obtained filtrate, and depositing a mixed extract of the cellulose and the lignin; 4) washing and extracting a mixed extract of the cellulose and the lignin by a water/DMSO mixed solvent, and filtering to obtain mixed liquid of a cellulose solid and lignin/DMSO/water; 5) drying the cellulose solid to obtain a cellulose product; and 6) decompressing and distilling the mixed liquid of the cellulose/DMSO/water to obtain a cellulose product. The method, provided by the invention, is simple, feasible and high in purity of the obtained cellulose.

The invention discloses a preparation method of a nano carbon fiber-metal composite capable of removing medium/low-concentration volatile organic compounds, which comprises the following steps: carrying out in-situ synthesis on a transition metal and lignin-based nano fibers to form the composite, and carrying out preoxidation, carbonization and activation on the composite fibers to obtain the high-specific-area high-catalytic-property nano carbon fiber material. The metal element is uniformly dispersed on the surface of the carbon fiber carrier by the electrostatic spinning in-situ synthesis technique, and thus, the composite maintains the advantages of developed surface pore structure and high specific area of the carbon fiber composite and also has favorable catalytic activity. The prepared nano fibers are an ordered uniform-diameter cheap material.

The invention relates to an active AP scan method in an 802.11 wireless local area network, belonging to the technical field of communications. The method comprises the following steps: sending out an exploring request MAC frame; carrying out sniffing scanning before receiving exploring responses of the AP so as to acquire other useful MAC frames, and analyzing all MAC frame header information to acquire related information of the adjacent AP; optimizing the exploring responses, and intercepting data within former 30ms as effective data; updating an AP database by adopting the data acquired in the step 2; repeating all steps to scan continuously if the AP that is suitable for switching is not explored, or finishing the scanning. The invention solves the defects that the scanning time of the AP is overlong during the MAC switching in the prior 802.11 wireless local area network, overcomes the shortages that a network protocol needs to be changed in the prior rapid AP scan method, and the like, just needs to correct client-terminal programs, fully utilizes the non-switching time of an MS and various useful MAC frames in the air, and achieves rapid and effective AP scanning.

The invention relates to a sludge treatment method for preparing oil products by liquefying sludge. The method comprises the step of performing liquefaction on the sludge in the subcritical or supercritical state of water to obtain the oil products. In addition, the invention also relates to application of the sludge treatment method to sludge treatment.

The invention discloses a sludge treatment method using a solar pyrolysis carbonization technology. The method comprises the following steps: adding the sludge produced by municipal sewage treatment into a pyrolysis carbonization furnace, carrying out a series of reactions, including vaporization, pyrolysis, dehydrogenation, pyrocondensation and carbonation, in a sealed, oxygen-free and non-burning state, wherein a heat source of the pyrolysis carbonization furnace is provided by a solar heat supply system, the reaction condition is high temperature and normal pressure, or high temperature and high pressure, or moderate-high temperature and high pressure, the high temperature is 500-800 DEG C, the moderate-high temperature is 200-400 DEG C and the high pressure is 1-16MPa. With the method provided by the invention, thorough treatment disposal of the sludge in a sewage plant is realized, secondary pollution is avoided, energy utilization rate is high, operation cost is very low, renewable resources is recycled, and reduction, stabilization, reutilization and resource utilization of sludge treatment disposal are really implemented completely.

The invention provides a method of treating the process effluent of dimethyl ether synthesis via methanol dehydration. The method at least comprises the following three steps: the first step, the process effluent is divided into two flows through the evaporation, wherein one flow is rich in organic substances and the other flow is poor in organic substances; the second step, the flow rich in organic substances is subjected to the membrane separation, the organic substances in the concentrate is recovered, and the water phase is reutilizes; and the third step, the flow poor in organic substances is subjected to the biochemical treatment so that the water quality meets the requirements on reclaimed water. Optionally, the method further comprises the fourth step, that is, the reclaimed water is treated by the water quality stabilization technology to meet the reclaimed water treatment requirement on the production equipment. The method can recycle the whole effluent after treatment and reclaim the organic substances in the effluent, and achieves the effect of resource utilization of the process effluent and the organic substances in the process effluent.

The invention provides a method for collecting carbon dioxide from fuel gas by using ammonia water fine spraying. The method comprises the following steps that: step A, flue gas passes through an absorbing tower from bottom to top, and CO2 within the fuel gas is absorbed by sprayed ammonia water; step B, carbon-containing pregnant solution is processed through thermal desorbing in a desorbing tower; step C, NH3 is removed from the desorbed gas in a washing tower, and the resulting gas is processed through a dewatering procedure by a condenser, such that carbon dioxide gas with high density isobtained; step D, weak ammonia water obtained from the above steps is pumped into an ammonia distilling tower to be concentrated; step E, concentrated ammonia water is diluted with water in an ammonia absorbing tower, such that the concentration of the ammonia water for spraying is adjusted. Correspondingly, the invention provides equipment for collecting carbon dioxide from fuel gas by using ammonia water fine spraying. The method and the equipment provided by the present invention are suitable for power stations with conditions of large flue gas flux and low carbon dioxide concentration, and assists in removing carbon dioxide effectively. According to the present invention, ammonia and water are used circularly, such that energy is saved, and cost for operation and maintenance are substantially reduced. Preferably, CO2 gas separated by the equipment is prepared into industrial grade liquid carbon dioxide.

The invention provides a preparation method of a sludge carbonization and modification magnetic nanometer material, comprising the following steps: drying, smashing and sieving excess sludge from a wastewater treatment plant, adding activating agent for activating treatment, performing pyrolyzation to obtain sludge activated carbon, loading nanometer MnFe2O4 onto the sludge activated carbon by means of a solvothermal method, so as to obtain the sludge carbonization and modification magnetic nanometer material. The invention also relates to application of the sludge carbonization and modification magnetic nanometer material prepared from the method disclosed by the invention capable of activating persulfate to realize printing and dyeing wastewater treatment. According to the invention, as the excess sludge is taken as primary raw material, resource utilization of the sludge is realized, the preparation method is simple and easy to operate, the cost is low, the sludge-based magnetic material has a stable structure and a small metal leaching rate, high magnetic stability enables the easiness for recycling and circulation, the activation effect remains very good after repeated utilization for many times, and the sludge carbonization and modification magnetic nanometer material is an environment-friendly material, and has a wide application prospect in degradation of organic pollutant.

The invention discloses a recycling method of a fine slag discharged by an anthracite coal water slurry gasifier and a structure thereof. The method comprises the following steps: respectively connecting gasified fine slag discharged by the anthracite coal water slurry gasifier and a flotation feeding barrel and a tail slime charging barrel through pumps; carrying out blending combustion of the gasifier by using clean coal entering the flotation feeding barrel obtained in a flotation manner; squeezing the material entering the tail slime charging barrel as coal slime to carry out blending combustion of a coal burning boiler; and pumping the wastewater after flotation and squeezing back to a lye storage tank to recycle. By adopting the recycling method, the gasification efficiency of the coal water slurry is improved, the energy consumption is reduced, high load and safe and stable operation of a coal chemical production line are ensured, and an exemplary role is played for development of an anthracite coal water slurry gasification technology in the field of the coal chemical industry in Guizhou even in China.

The invention discloses a method for producing an organic fertilizer by using activated sludge, belonging to the field of biological organic fertilizers and aiming to reduce the pollution of the activated sludge to the environment, change wastes into wealth and produce the organic fertilizer by recycling the activated sludge. The technological method disclosed by the invention comprises the steps of: by utilizing the characteristic that the activated sludge contains rich starch, cellulose, fat, proteins and other substance, comprehensively treating the activated sludge by using biological bacterial liquid and an enzymic preparation, wherein the enzymic preparation contains the components as follows: 30-40% of amylase, 25-35% of cellulase, 20-30% of lipase, and 25-35% of protease; and adding bran and other auxiliaries, fermenting in a solid-state fermentation tank at 60 DEG C for 7 hours, drying and crushing to obtain the organic fertilizer. According to determinations based on national standards on the organic fertilizer of the ministry of agriculture in China, relevant indexes of the produced organic fertilizer are all qualified.

The invention provides a preparation method of biomass-based ferroaluminium complex spherical carbon. The method comprises the steps of carrying out carbonizing treatment on raw materials including sludge and crop straw, uniformly mixing the carbonized raw materials with home-made ferroaluminium complex powder according to a certain ratio, bonding carbon powder to form a spherical magnetic carbon precursor by using water glass as a bonder, and finally carrying out certain calcining treatment on the precursor to obtain the biomass-based ferroaluminium complex spherical carbon. The preparation method is simple in process and low in production cost and is capable of realizing the resource utilization of biomass; the spherical carbon has self-sintering property, high mechanical strength and favorable magnetic property; the preparation method can be widely applied to preparation of spherical magnetic carbon in a relatively large range of sizes; the spherical carbon prepared by the method can be widely applied to the fields of sewage treatment and soil pollution control.

The invention discloses a technological method for degrading feces from livestock and poultry by using complex microbial communities, and relates to the technical field of environment-friendly biological treatment. The technological method comprises the steps that 1, the complex communities are put on stacked materials formed through the combination of sawdust, straw, rice husk and other agricultural wastes for even mixing, wherein the moisture is controlled to 30-35%, and the standing time is 12-24 hours; 2, the well-stirred feces from livestock and poultry are sprayed on the stacked materials in the first step, the mixture is fully and uniformly stirred, the water content is adjusted to 55-65%, and stacking fermentation is conducted for 24-48 hours, wherein the complex microbial communities include fecal alkali-producing bacteria, nitrification and denitrification bacteria, autotrophy sulfuration and deodorization bacteria, low-temperature heterotrophic bacteria, actinomycetes, thermophilic bacteria, cellulose decomposition bacteria and bacillus subtilis. By means of the technological method, the hazards of foul gas, sewage and excrement in the feces from livestock and poultry to the environment are solved fundamentally, zero release and zero pollution are achieved, no bad smell, no waste residue and no waste water are discharged, meanwhile, the residual stacked materials can be prepared into organic fertilizers, and waste materials are turned into wealth and recycled.

The invention discloses a process method for treating oily sludge of an oil field. The oily sludge is decomposed into water, crude oil, tailings and gas through oily sludge screening, oily sludge drying, oily sludge crushing, oily sludge homogeneous feeding, oily sludge preheating, oily sludge pyrolysis and oil gas treatment. Water can be recycled, the crude oil can be stored, the tailings can be used as building raw materials, gas discharge reaches standards and oily sludge resourceful treatment is realized. The oily sludge screening process screens bulk materials and impurities. The oily sludge drying process is used for reducing water content of semi-fluid/fluid oily sludge having water content greater than 40% to 40% or less. The oil gas treatment process is used for transforming gas produced by pyrolysis into water, crude oil and gas satisfying emission standards through condensation, oil-water separation, high-temperature combustion and tail gas desulfurization and denitrification. The process method has the advantages of reasonable design, safety, environmental friendliness, good treatment effect, high treatment efficiency, cost saving, economical efficiency, applicability and wide application prospect.

The invention relates to the field of tailing resource comprehensive utilization and waste innocent treatment, and provides a composite cement curing agent used for rapidly curing waste slag (gold slag for short) obtained after subjecting gold ore tailings to iron separation. A cured gold slag product is prepared by fully mixing 85 wt% of gold tailing gold slag and 15 wt% of the composite cement curing agent (comprising an alkaline activator, a sulfate activator, and the like) according to a certain ratio through a material mixer, adding water having a certain mass, fully stirring, adding the mixture after fully stirring into a mold, molding, and curing a molded sample in air for 1 d. The unconfined compression strength when a curing period is 1 d of the cured gold slag prepared by using the curing agent is 1.0 MPa or above, unconfined compression strength when a curing period is 3 d of the cured gold slag is 2.0 MPa or above, and unconfined compression strength when a curing period is 7 d of the cured gold slag is 2.5 MPa or above. The curing agent is simple in formula, low in using amount, good in catalytic effects, and rapid in curing, and the early strength of a cured product is high. Unification of tailing treatment and comprehensive utilization is achieved.

The invention discloses a novel garbage sorting, grinding and collecting device which comprises a first sorting opening, a second sorting opening, a first garbage grinder, a first garbage compressor and a second garbage compressor. The second sorting opening is arranged on one side of the first sorting opening, the first garbage grinder is arranged at the bottom of the first sorting opening, the first garbage compressor is arranged at the bottom of the first garbage grinder, a first storage area is arranged at the bottom of the first garbage compressor, the second garbage compressor is arranged at the bottom of the second sorting opening, and a second storage area is arranged at the bottom of the second garbage compressor. The novel garbage sorting, grinding and collecting device has the advantages that garbage can be divided into a garbage part capable of being ground and another garbage part, the garbage part capable of being ground is manufactured into finished fertilizers, the other garbage part is directly compressed to save space and then is conveyed to a garbage recycling station, accordingly, garbage resources are utilized to the greatest extent, the garbage disposal quantity is reduced, the quality of a living environment is improved, and the novel garbage sorting, grinding and collecting device is environment-friendly.

The invention discloses a coupling technology of cellulosic ethanol production and biomass combustion power generation, which belongs to the renewable energy technology field. The coupling technology takes lignocellulose as raw material for carrying out the cellulosic ethanol production and the biomass direct combustion or the mixed combustion power generation, the lignocellulose raw material separately passes through a lignocellulose feeding device to enter a biomass combustion power generation device for realizing the direct combustion power generation; or the lignocellulose raw material is mixed with coal for combustion, thus realizing the mixed combustion power generation and further realizing the combustion power generation of the lignocellulose; hot steam which is generated by the power generation technology is recovered through a waste heat recovery device and used for heating of the cellulosic ethanol production technology; the generated power enters a national power grid through a transformer or is supplied to the cellulosic ethanol production. Therefore, the coupling technology realizes the cellulosic ethanol production and the biomass combustion power generation. The biomass power generation efficiency achieves 28-32 percent and can provide the power.

The invention discloses an advanced treatment and reuse method of a pre-coated membrane of tail water of a sewage plant. The method comprises the following steps: firstly, feeding tail water into an adjusting pool so as to be homogenized, and then passing through a sand filter; passing through an ultrafiltration membrane by a solution containing a pre-coated membrane material and sand filtered effluent and effectively forming a dynamic membrane on the surface of the ultrafiltration membrane, wherein concentrated water of the ultrafiltration membrane returns to the adjusting pool while the effluent enters into a middle water tank; backwashing the ultrafiltration membrane through a pump by part of water in the middle water tank periodically, wherein the pre-coated membrane automatically falls and the sediment of the coating material is recycled to a pre-coated membrane material dosing device repeatedly, so that the operating cost is lowered; entering into reverse osmosis membrane treatment by water in the middle water tank, fresh reverse osmosis membrane is used as industrial water in the park to be returned, and the concentrated water is treated by an electrochemical reactor, and the effluent reaches the standard to be discharged. By adopting the pre-coated membrane method, the ultrafiltration backwashing frequency is low, and the water yield of the ultrafiltration membrane is improved. Loose filter cake layers with great holes can be formed to effectively relieve the rate of descent of membrane flux, improve the anti-pollution capacity of the membrane and improve the removal effect of the membrane on the water quality index at the same time.

The invention relates to cyclone flashing-speed reduction direct steelmaking system and process. The system comprises a carbon monoxide preparation device, a cyclone flashing-speed reduction furnace,an electric heating smelting separation furnace and a tail gas aftertreatment device. The tail gas aftertreatment device comprises a preheating/pre-reduction device, a tail gas dedusting and purifyingdevice, a heat exchanger and a tail gas separating device. The process comprises the steps of carrying out electrochemical reduction on carbon dioxide to prepare carbon monoxide and oxygen; sprayingthe carbon monoxide, the oxygen, iron ore powder and a flux into the cyclone flashing-speed reduction furnace, carrying out reduction at 900 to 1500 DEG C, and obtaining pre-reduced iron powder/iron drops with the metallization ratio being larger than 70 percent; entering the electric heating smelting separation furnace so as to carry out smelting separation and final reduction; sequentially preheating/pre-reducing the iron ore powder and the flux through reduced and smelted tail gas, dedusting, preheating the oxygen, and separating to obtain carbon monoxide and carbon dioxide; and returning to a cyclone furnace and a carbon dioxide reduction device for recycling. According to the process, electric energy is utilized for smelting, the process does not rely on fossil fuels, the carbon monoxide is recycled, no pollutant and carbon dioxide is discharged in the process, and clean smelting is realized.

The invention provides a dye absorbent made of hazelnut shells, and belongs to the technical field of absorbent. The preparation method of the dye absorbent comprises the following steps: washing hazelnut shells with tap water, drying, grinding, and sieving the hazelnut shells, then mixing the obtained hazelnut particles with a zinc chloride solution, soaking the hazelnut particles in the zinc chloride solution, then subjecting the hazelnut particles to a microwave treatment, and then subjecting the hazelnut particles to processes of acid washing, water washing, and drying so as to obtain the hazelnut shell biomass carbon dye absorbent. The dye absorbent can be used to remove methylene blue, rhodamine B, active bright-red K-2G, and active bright-blue KN-R in the dye wastewater. The hazelnut shell biomass carbon dye absorbent has the advantages of simple technology, low cost, and good absorbing effect.

The invention provides a system and a process for comprehensively using coking low-quality sulfur and desulfurized solution secondary salt. The system comprises a centrifugal spray dryer, a heat pipe heat exchanger, a sulfur burning furnace, a waste heat boiler, a converter and an absorber, wherein the centrifugal spray dryer is used for drying sulfur foam containing elemental sulfur and the desulfurized solution secondary salt into mixed particles containing elemental sulfur and secondary salt crystals; the heat pipe heat exchanger recovers waste heat in flue gas to produce hot air required by the centrifugal spray dryer during drying; the sulfur burning furnace is connected with the centrifugal spray dryer and burns the mixed particles to generate high-temperature gas with the main ingredient being SO2; the waste heat boiler is connected with the sulfur burning furnace and comprises a heat pipe evaporation pipe and used for recovering heat of the high-temperature gas, so that the high-temperature gas is cooled to low-temperature gas with the main ingredient being SO2; the converter is connected with the waste heat boiler and used for converting SO2 in the low-temperature gas into SO3; the absorber is connected with the converter and used for absorbing SO3 and producing concentrated sulfuric acid.

The invention relates to a sludge resource utilization device and method. The sludge resource utilization device comprises a sludge storage and delivery unit, a pyrolysis reaction unit, a dust removalunit, a pyrolysis gas injection unit, an industrial boiler or an industrial kiln furnace, a sludge coke collection and feeding unit, and an automatic control unit, wherein the automatic control unitcontrols the above-mentioned units to work. As for the device and method, according to the characteristics of high volatile matter and nitrogen content in sludge, the high-temperature flue gas produced in the industrial boiler or kiln furnace is used as a heat source and carrier gas, the sludge is pyrolyzed at a certain temperature to produce pyrolysis gas and sludge coke, subsequently, the flue gas mixed with the pyrolysis gas is reintroduced into the combustion zone of the industrial boiler or kiln furnace, the pyrolysis gas is used as a reburning fuel and a gas denitration agent to remove the NOx in the flue gas while achieving energy utilization, and the produced sludge coke can be used as a reburning fuel and a solid denitrition agent for flue gas denitrition of the industrial boileror kiln furnace to play a role in removing the NOx while replacing part of coal.

The invention discloses a coal water slurry gasification process method suitable for treating waste water containing high-concentration ammonia and nitrogen and COD. The method includes the following steps that 1, coal water slurry is prepared; 2, the coal water slurry is combusted in a gasification furnace; 3, washing and cooling are carried out in a quenching chamber; 4, ash is collected and discharged; 5, crude gas is purified; 6, carbon black water is purified. By utilizing the production characteristic that it is needed to add part of water in coal water slurry preparation and adopting the process of preparing the coal water slurry by replacing clean river water with the waste water, problems existing in slurrying characteristics are effectively solved, the waste water is utilized without the limitation of the concentration of ammonia and nitrogen and COD, and industrialized continuous production is achieved; according to the coal water slurry prepared from the waste water containing high-concentration ammonia and nitrogen and COD, in the environment where the gasification combustion temperature is 1400 DEG C and the operation pressure is larger than 2 MPa, the waste water containing high-concentration ammonia and nitrogen and COD is subjected to pyrolysis, thoroughly treated and converted into useful synthesis ammonia and urea raw materials, and therefore the effect of making waste profitable is achieved.

The invention provides a construction waste resourceful treatment method. The method comprises the following steps: classifying construction waste according to the resourceful degree; when processing raw materials, performing primary screening on the construction waste by using pre-screening equipment; performing magnetic separation on the residual construction waste; performing primary crushing by using a movable jaw crusher, and performing winnowing to screen out light substances in the construction waste; and then performing final crushing and screening on construction raw materials with a movable impact crusher and a vibrating screen classifier to obtain four renewable aggregates. In the whole production process, the sorting effect is good, particles of various types and grades are separated carefully, and the quality of final regenerated products is good, so that resource utilization of construction waste is achieved.

The invention discloses spherical nano-porous hydroxylapatite prepared through shells and a preparation method thereof, and belongs to the technical field of material preparation. According to the hydroxylapatite prepared through the method, the hydroxylapatite is in a spherical shape, the diameter is 4-5 micrometers, the dispersity is good, the specific surface area is 270 cm<2>/g, the average pore diameter is 18 nm, carbonate radicals are contained, the components are similar to those of hydroxylapatite in the bones, and the biocompatibility is good. The preparation method comprises the following steps that the shells are washed, dried and ground, acetic acid with the concentration of 0.1 g/mL is added to fully react with the ground shells, an H3PO4 solution is dropwise added into a prepared calcium acetate solution, trisodium citrate is added, urea is added after reacting under stirring are performed, a prepared solution is stirred to be subjected to a reaction for 5 min in a water bath at the temperature of 80 DEG C-90 DEG C, standing is performed until precipitates occur, and the obtained precipitates are filtered, washed, dried and then collected. According to the method, shell powder does not need to be calcined, the reaction time is short, the pH does not need to be adjusted, operation is easy, the repeatability is good, the raw materials are easy to obtain, and not only is waste utilization achieved, but also energy conservation and emission reduction are facilitated.

The invention discloses a method for processing papermaking wastewater and producing biological oil, and its special bacterial strain Rhodococcus sp. LDS5. According to the method, the Rhodococcus sp. utilizes the papermaking wastewater as a culture medium to produce the biological oil, and simultaneously organic matters in the papermaking wastewater are degraded. The method comprises the following steps: inoculating the Rhodococcus sp. LDS5 or a bacterial agent treating the Rhodococcus sp. LDS5 as an active component into the papermaking wastewater, and culturing to obtain Rhodococcus sp. LDS5 thalli; and extracting from thalli to obtain triglyceride. According to the method, the COD removal rate and the BOD removal rate of the papermaking wastewater reach above 55% and above 75% respectively. The method for producing the microbial oil has the advantages of simple operation, low cost and high practical value, can effectively solve a papermaking wastewater pollution discharge problem, enables conversion of wastes into biological oil as biodiesel raw material, and realizes the resource utilization of the papermaking waste.

The invention relates to a preparation method of aluminum fluoride for an aluminum electrolytic cell. The preparation method comprises the following steps of adding alkali into a lithium, aluminum andpotassium-enriched electrolyte leaching solution to adjust the PH; controlling proportion of Al3<+>, F<-> and OH<-> to carry out a precipitin reaction to obtain a certain amount of precipitate, wherein the reaction temperature is 20-110 DEG C and the reaction time is 20-120 min; and calcining the obtained precipitated product for 1-3 hours at 350-650 DEG C to obtain anhydrous aluminum chloride. By adding alkali and controlling the proportion of Al3<+>, F<-> and OH<-> to obtain hydroxyl aluminum fluoride and calcining the hydroxyl aluminum fluoride to obtain aluminum fluoride, more than 90wt%of Al3<+> and F<-> can be recovered simultaneously to the highest extent. In the process, other impurities are not introduced, and the alkali metal loss rate is low. The preparation method is simple to operate, makes preparation for follow-up lithium precipitation and is low in treatment cost.

The invention discloses a sludge drying method and system. The sludge drying method comprises the following steps: pre-drying wet sewage sludge with the moisture content of above 80% by adopting a mechanical filter pressing method so as to reduce the moisture content of the sludge to about 65%; crushing the pre-dried sludge into sludge powder, dispersing and flatly paving the sludge powder on baffle plates with fine meshes, piling up multiple layers of baffle plates, leaving voids among the sludge powder, and air-drying the sludge powder by using normal temperature air so as to reduce the moisture content of the sludge to about 45%; and feeding the piled and air-dried sludge powder into a drying groove, turning and throwing by using a turning and throwing device, and meanwhile air-drying the sludge powder by using the normal temperature air so as to reduce the moisture content of the sludge to below 30%. Dry air absorbing moisture in the sludge is discharged, subjected to purification treatment and emitted after meeting the environmental protection requirements, and the dried sludge is discharged from the drying groove and is further treated. According to the sludge drying method, external heat sources are not needed, and the rapid drying of sludge is realized at relatively low operating cost.

The invention discloses a method for controlling stony desertification through watercourse sludge. The method includes the steps that coal ash is added to the watercourse sludge to be mixed evenly, the mixture is placed indoors for 5-10 days, the water content is made to reach 45-70%, the mixture is made to be balls through a mold, roots of seedlings of pioneer plants are buried in the balls, and the balls are evenly placed to the stony desertification areas. The method has the advantages that a large amount of watercourse sludge is processed, the problem that environmental pollution is caused when sludge is dumped to seas or used for land filling can be solved, the problem that plants are difficult to plant due to soil depletion of the stony desertification areas can also be solved, resource utilization of the watercourse sludge is achieved, resources are saved, the environment is protected, and good social and economic benefits and wide application prospects are achieved.

The invention provides a wastewater zero-discharge system for an acid regeneration system and a process of the wastewater zero-discharge system. The wastewater zero-discharge system comprises a wastewater collecting pool, wherein the wastewater collecting pool is provided with a sedimentation area and a clarified solution area; the sedimentation area and the clarified solution area are separated by a separation wall; a filter screen is arranged above the separation wall; the sedimentation area is used for collecting wastewater discharged by the acid regeneration system; the clarified solution area is connected with a lifting pump; the lifting pump is connected with a filter; when the acid regeneration system normally operates, the generated wastewater passes through the filter, then is collected in a rinse water collecting tank and is used for the acid regeneration system; when the acid regeneration system abnormally operates or fails, the generated wastewater passes through the filter, is collected in an acid storage tank and then is used for the acid regeneration system. Therefore, according to the wastewater zero-discharge system for the acid regeneration system and the process of the wastewater zero-discharge system, the wastewater can be recycled, and the production cost is reduced.