196results about How to "Strong adsorption capacity" patented technology

The invention discloses a biomass adsorbent for the treatment of heavy metal wastewater and a treatment method of the heavy metal wastewater. The biomass adsorbent is prepared through the following steps of: dehydrating and drying corchorus olitorius; and then grinding into powder. The treatment method of the heavy metal wastewater comprises the following steps of: pouring the biomass adsorbent into the heavy metal wastewater; and then oscillating the heavy metal wastewater. The biomass adsorbent disclosed by the invention has very high adsorption capacity on heavy metals contained in the wastewater; by treating the heavy metal wastewater by using the method, various heavy metals can be effectively removed, wherein the removal rate on cadmium, copper, lead, chromium, zinc, manganese, mercury, and the like can reach 95.0-99.9 percent, and the removal rate on nickel is more than 80 percent; and in addition, the heavy metals absorbed by the biomass adsorbent disclosed by the invention can be recovered through methods, such as an incineration smelting method or a chemical reduction method and the like, and therefore higher utilization value is created.

The invention provides a sewage purifying agent which is prepared from the following components and raw materials in parts by weight: 90-100 parts of modified attapulgite, 10-15 parts of montmorillonite powder, 5-7 parts of chitosan, 4-5 parts of gypsum powder, 5-6 parts of quartz stone powder, 10-12 parts of polyethylene glycol, 2-4 parts of glutinous rice flour, 8-10 parts of poly-3-hydroxybutyrate, 0.1-0.2 part of zinc sulfate, 0.1-0.2 part of manganese sulfate, 0.1-0.2 part of potassium chloride and 0.2-0.5 part of ferrous sulfate. When the sewage purifying agent is prepared, the modified attapulgite and other components and raw materials contained in a formula are sufficiently mixed, granulated and packaged. The sewage purifying agent provided by the invention has the advantages of sewage purifying and sterilizing effect and long residual action.

The invention provides a crude oil viscosity-reducing and depressant composite and relates to the technical fields of organic chemistry, petroleum industry and pipe system. The composite consists of clay, organic depressant and dispersion medium, wherein the weight ratio of clay to organic depressant is 1:0-1:5; dispersion medium accounts for 1%-99% of the total weight; clay contains montmorillonite, hectorite, nontronite or saponite and is unmodified inorganic clay or organic clay after organic modification. The organic clay is the organic clay obtained through organic cationic modification or the organic clay obtained through organic cationic modification and silane coupling agent treatment; and the organic depressant is common organic depressant. After the crude oil viscosity-reducing and depressant composite is used, the viscosity of crude oil is reduced, the viscosity tends to be reduced in the shearing field and crude oil has good low temperature liquidity and ageing.

The invention discloses a preparation method of biological carbon by using grapefruit skin. The method is as below: drying and pulverizing grapefruit skin, and mixing the grapefruit skin with an aqueous solution of catalyst, and conducting a hydrothermal carbonization reaction; after the hydrothermal carbonization reaction, washing and drying to obtain the biological carbon. The temperature of the hydrothermal carbonization reaction is 160 DEG to 260 DEG C; the catalyst is at least one selected from phosphoric acid, sulfuric acid, hydrochloric acid, acetic acid, citric acid, acrylic acid, sodium polyacrylate, sodium polystyrene sulfonate, zinc chloride, and stannic chloride. In addition, the invention also comprises the biological carbon which is prepared by the method and the application of the biological carbon in the adsorption of heavy metals. The biological carbon material obtained by the invention has the advantages of microsphere particle shape, uniform particle size and high adsorption capacity, and can be applied to the field of adsorption and remediation of heavy metal pollutants or organic pollutants.

The invention relates to lensing spherical vaterite calcium carbonate crystals with high purity and a preparation method thereof. The calcium carbonate crystals are formed into a lensing structure with a diameter of 0.8 to 3.0 mu m and a thickness of 0.5 to 2.5 mu m through aggregation of nanosphere particles with a size of 50 to 150 nm, and the content of spherical vaterite calcium carbonate is 100%. The preparation method comprises the steps of dissolving ionic liquid surfactants into deionized water, sequentially adding the aqueous solution of sodium carbonate and the aqueous solution of calcium chloride, carrying out stirring fro even mixing, and carrying out aging, separating and air drying; therefore, monodisperse lensing spherical vaterite calcium carbonate is obtained. The preparation method provided in the invention is simple; reaction conditions are mild and easy to control; the yield of lensing spherical vaterite calcium carbonate crystals is high; therefore, the preparation method is suitable for large scale production. The calcium carbonate crystals obtained in the invention have good monodispersion and uniform distribution and can be used as fillers in the industries of papermaking and the like.

The invention discloses a method for preparing a magnetic microbe immobilizing material for soil pollution repair and an application thereof. The method comprises the following steps: (1) drying, pulverizing and sieving waste biomass in 20-100 meshes; (2) charging the sieved biomass into 0.1 mol/L of iron salt solution, dropwise adding 3-6 mol/L of NaOH solution during stirring till the pH value is 9 to 10; filtering, drying and carbonizing sediments with limited oxygen at 100-400 DEG C for 1 hour to 4 hours to prepare a carrier material; (3) injecting bacterial suspension according to the solid-to-liquid ratio of 1-10mL/g and adding sodium alginate; (4) dropwise adding the mixed suspension into 2-5 percent of CaCl2 solution to prepare a particle with the diameter of 1 mm to 2 mm; breeding the particle to prepare a magnetic microbe immobilizing material; and (5) charging the prepared material into polluted soil according to 2-20 ton/hectare and plowing 0 cm to 30 cm of soil in the surface layer, after 3 to 12 months, recovering by magnetic separation, activating and recycling. The invention has the advantages of magnetic material and controllable particle parameter, can be recovered by magnetic separation after use and is suitable for in-situ biological repair and heterotopic slurry reaction vessel repair of the polluted soil.

The invention discloses a method for preparation of a nitrogen doped porous nano carbon material with biomass as the carbon source by gel process and application thereof. The method includes: selecting soybean residue or soybean as the carbon source, using a transition metal salt as the coagulant, and making soaked, grinded and boiled soybean milk solidify to form tofu gel; and conducting vacuum freeze drying, and performing high temperature carbonization and activation under an inert atmosphere, thus obtaining the transition metal embedded nitrogen doped porous carbon nano material. The preparation method provided by the invention has the advantages of simple process operation, low cost and easy realization of large-scale commercial production. The nitrogen doped porous nano carbon material prepared by the method has a high degree of graphitization, large mechanical strength and high conductivity, is embedded with metal nanoparticles, and can be applied to supercapacitors, lithium-ion batteries, catalysis, adsorption and other fields.

The invention discloses a manganese dioxide modified biochar composite material as well as a preparation method and an application thereof. The composite material is prepared from manganese dioxide and biochar by loading generated manganese dioxide on biochar through the neutralization reaction of permanganate and manganese in divalent manganese salt. The manganese dioxide modified composite material has the advantages of high adsorption capacity for heavy metal lead or cadmium, obvious adsorption effect, low preparation cost and the like, and is an ideal heavy metal wastewater adsorbent; thepreparation method of the composite material has the advantages of simple process, cheap raw materials, sufficiently used raw materials, low production cost and the like. The manganese dioxide modified composite material can be used for treating heavy metal wastewater, and has the advantages of high adsorption capacity for heavy metals, high adsorption efficiency, low toxicity to organisms in theenvironment and the like, and can be produced and applied on a large scale.

The invention belonging to the technical field of material chemistry relates to a polydivinylbenzene material with a super strong absorption characteristic and a synthesis method, in particular to a mesoporous polymer in which polymeric chains loose enlace polydivinylbenzene as a framework, the specific surface area is 200 to 700 m ²/g, the water absorption capability is nearly 2.0 g/g, and the liquid absorption capability reaches 17 g/g. Divinylbenzene monomers are dispersed into organic solution, which is then added with azobisisobutyronitrile as initiator, after stirring, the solution is poured into a reaction kettle, and the mesoporous polymer material is synthesized by a solvent thermal process. The method of the invention avoids the traditional step of removing template agent in the synthesis of mesoporous materials, and the size of mesopore can be regulated by selecting different solution. The synthesis process is simple, requirement is low, and cost is low. The mesoporous polymer of the invention can be widely applied to absorbing organic pollutants, treating pollution caused by the leakage of organic matters.

The invention relate to a magnesium hydroxide/graphene compound adsorbing material for phosphorus-containing wastewater treatment as well as a preparation method and an application thereof. The preparation method comprises the following steps of: 1) preparing graphene oxide through using a chemical oxidization method by utilizing natural graphite; 2) dripping a magnesium chloride solution into a graphene oxide solution; agitating for 1-3 hours; then adding an alkaline solution having the same mol amount as magnesium chloride; continually agitating for 1-3 hours; filtering, washing and drying to obtain a magnesium hydroxide/graphene oxide compound adsorbing material; and 3) carrying out ultrasonic treatment on the magnesium hydroxide/graphene compound adsorbing material obtained by the step 2 in water for 1-2 hours; adding a reducing agent and carrying out reduction reaction in microwaves of being 800W for 2-5 minutes; and filtering, washing and drying to obtain the magnesium hydroxide/graphene compound adsorbing material. The magnesium hydroxide/graphene compound adsorbing material has the advantages that the adsorption capability is good; the application range is wide; and raw materials for preparing the adsorbing material are easy to obtain and a microwave reduction method is simple.

The invention provides zirconia-modified graphene and a method for removing fluorine ions in water. A preparation method of the zirconia-modified graphene comprises the following steps of dispersing graphene in a zirconium oxychloride water solution, heating, stirring, filtering to obtain a reaction product, washing and drying the reaction product to obtain the zirconia-modified graphene. Through zirconia modification, the advantages of acid and alkali resistance, large specific surface area and the like of graphene materials are maintained and the efficient adsorption capacity of zirconium oxide to the fluorine ions is fully utilized; when serving as an adsorbent to remove the fluorine ions in the water, the zirconia-modified graphene is simple to operate, strong in adsorption capacity, remarkable in removing effect, easy in regeneration recycling and good in economic and environmental benefits and is an adsorbent with a broad application prospect.

The invention discloses a method for restoring heavy metal contaminated soil through cooperation of magnetic activated carbon and an activating agent. The method includes the following steps that firstly, the activating agent is added to the heavy metal contaminated soil, and the soil is tilled evenly and activated for 20 d to 30 d; secondly, the magnetic activated carbon is added to the activated heavy metal contaminated soil, and the soil is tilled evenly and adsorbed for 20 d to 30 d; thirdly, the magnetic activated carbon is recycled in a magnetic separation manner; fourthly, the magnetic activated carbon recycled in the third step is soaked in 0.1 mol/L to 0.5 mol/L of acid liquid for 1 h to 2 h and washed through deionized water to be neutral so as to be recycled; fifthly, heavy metal ions in the acid liquid for washing the magnetic activated carbon in the fourth step are recycled; and sixthly, the first step to the fifth step are cycled till the content of heavy metal in the soil reaches the standard. After the method is adopted for cyclically restoring the soil at three times, the content of heavy metal in the heavy metal contaminated soil can reach the secondary standard, and the method is simple, efficient and short in period.

The invention discloses an adsorption device, which comprises a sucker and a sleeve which is arranged above the sucker, wherein an opening is formed in the middle of the sucker; a small hole for connecting an electric wire is formed in the sleeve; a stabilizing device for stabilizing the sucker is arranged between the sucker and the sleeve; a sliding groove is formed in the middle of the sleeve; a first electromagnet, a magnetic sheet, a sliding block and a second electromagnet are sequentially arranged in the sleeve from top to bottom; the first electromagnet is fixedly arranged on the sleeve by virtue of a lifting bolt; an extension spring is arranged between the first electromagnet and the magnetic sheet; an air cylinder is arranged between the sliding block and the second electromagnet; a compression spring is arranged between the second electromagnet and the air cylinder; a piston rod is arranged at the upper part of the sucker; and a sealing ring is arranged between the air cylinder and the piston rod. The adsorption device is high in adsorption capacity, simple and rapid to switch between adsorption and separation and is easy for practical use. The invention also provides a climbing cleaning robot using the adsorption device.

The invention discloses a BiOI / N doped graphene composite photocatalyst and a preparation method thereof. The method mainly comprises the following steps: 1) preparing a graphene oxide colloidal suspension mixing with urea by stirring, drying, conducting high vacuum thermal reduction to obtain N doped graphene; 2) conducting ultrasonic dispersion on the N doped graphene in the glycol solution of potassium iodide, and stirring and mixing without bismuth nitrate hydrate glycol solution; and 3) transferring the above mixed solution into an autoclave with teflon liner, conducting hydrothermal reaction to obtain a solid product; and conducting repeated centrifugation, washing and drying on the solid product. The BiOI / N doped graphene composite photocatalyst prepared by the invention comprises bismuth oxyiodide in flower-like particles and nitrogen doped graphene coated with the bismuth oxyiodide particles, and forms a p-n heterojunction on the interface. The catalyst prepared by the invention has excellent performance in the field of photocatalytic degradation of organic pollutants, and has potential application value in the field of photocatalytic treatment of sewage.

The invention discloses a high-salt high-alkali medium-low-level radioactive liquid waste cement solidified body which is composed by mixing the following components: high-salt high-alkali medium-low-level radioactive liquid waste and, solidification material, water glass and cellulose ether, wherein the high-salt high-alkali medium-low-level radioactive liquid waste to the solidification material is 0.55-0.75: 1 in mass proportion; the modulus of the water glass is 2.5-3.5 based on Na2O in the water glass and the mass of the solidification material is 1-3% of the mass of the water glass ; the mass of the solidification material is 0.05-0.5% of the mass of the cellulose ether; the component mass percent of the solidification material is as follows: 20-40% of low-heat Portland cement, 15-50% of slag powder, 15-30% of coal ash, 5-15% of zeolite and 5-15% of attapulgite; and the cement solidification body with various properties meeting the requirements is obtained by carrying out normal-temperature maintenance on the mixed slurry which obtained by mixing and stirring. The high-salt high-alkali medium-low-level radioactive liquid waste cement solidified body is suitable for the solidification of the medium-low-level radioactive liquid waste, which has the total salt concentration being 100-400g/L, the pH value being larger than 13 and the nuclide being 90Sr or/and 137 Cs.

The present invention is a water-thinned latex paint containing nanometer calcium carbonate for outer wall and its preparation process. The paint consists of nanometer calcium carbonate, modified polymer emulsion, other pigment and filler, assistant A, assistant B, assistant C and calcium carbonate slurry. The modified polymer emulsion consists of soft monomer and hard monomer in the mass ratio of 54/46 to 56/44, the soft monomer is methyl acrylate, ethyl acrylate or capryl acrylate; and the hard monomer is methyl methacrylate or styrene. The nanometer calcium carbonate as the paint solid component can disperse homogeneously in the latex paint without needing surface modification and the paint has raised performance.

The invention aims at solving the problem that the research on the desulfurization and denitrification adsorbent in the prior art is less, and provides a flue gas desulfurization and denitrification adsorbent and a preparation and usage method thereof. The adsorbent is a deep eutectic solvent generated by reacting tetrabutyl ammonium bromide with ethylene glycol according to the molar ratio of 1:(2-100); furthermore, the adsorbent is an iron-based deep eutectic solvent generated by adding ferrous chloride into the deep eutectic solvent and reacting, the content of the ferrous chloride in the deep eutectic solvent is 0.1-1mol/L. The adsorbent has adsorption selectivity, can simultaneously adsorb SO2 and Nox in flue gas and the adsorption quantity is large, so that the desulfurization and denitrification cost can be lowered, no secondary pollution exists, and the deep eutectic solvent adsorbent can also realize repeated adsorption-desorption cyclic regeneration.

The invention discloses a preparation method of a nanometer composite filter material. The method comprises the following steps: 1, mixing seaweed mud with E33 and zeolite powder, and milling; 2, uniformly mixing the mixture obtained in step 1 with active carbon, and adding water; 3, carrying out high temperature sintering; and 4, mixing the product obtained in step 3 with nanometer titanium dioxide to obtain the nanometer composite filter material. The nanometer composite filter material has extremely strong adsorption capability, can remove heavy metals in water, has the advantages of good sterilization performance, safety, non-toxicity and no secondary pollution, and can be used to purify drinking water or sewage.

The invention discloses a novel activated carbon fiber adsorbent a preparation method and the application thereof. The activated carbon fiber adsorbent is characterized by carrying MoS2 on the surface of activated carbon fiber. The preparation method comprises the following steps: the activated carbon fiber is used as a carrier, ammonium molybdate is used as a precursor, and deionized water is used as a solvent to be prepared into steeping liquor, wherein the mass ratio of the activated carbon fiber to the ammonium molybdate is 1 : 0.25 to 0.3; the ammonium molybdate is carried in the activated carbon fiber by a wet immersion method, and then, the activated carbon fiber immersed with the ammonium molybdate is heated to 450 to 500 DEG C in inert atmosphere to be oxidized and decomposed to obtain MoO3-activated carbon fiber; and then, the MoO3-activated carbon fiber is heated to 800 to 825 DEG C in Ar/H2S to be sulfurized, and finally, the activated carbon fiber with the surface carried with MoS2 is prepared, i.e. the activated carbon fiber adsorbent is prepared. When the activated carbon fiber adsorbent is used for removing mercury in fume, the effect is good, and the activated carbon fiber adsorbent also has the advantages of simple preparation and easy process control.

The present invention is a water-thinned latex paint containing nanometer calcium carbonate for inner wall and its preparation process. The paint consists of nanometer calcium carbonate, modified polymer emulsion, other pigment and filler, assistant A, assistant B, assistant C and calcium carbonate slurry. The modified polymer emulsion consists of soft monomer and hard monomer in the mass ratio of 54/46 to 56/44, the soft monomer is methyl acrylate, ethyl acrylate or capryl acrylate; and the hard monomer is methyl methacrylate of styrene. The nanometer calcium carbonate as the paint solid component can disperse homogeneously in the latex paint without needing surface modification and the paint has raised performance.

The invention discloses a modified bentonite and zero-valence iron water treatment agent which adopts an effluent treatment technology of blending the modified bentonite and the zero-valence molten iron, wherein the blending ratio of the modified bentonite to the zero-valence molten iron is the weight ratio of the modified bentonite to the zero-valence molten iron between 10:1 and 1:5. The effluent treatment technology has the characteristics of high efficiency in pollutant removal, a long zero-valence iron service life and a wide range PH value of the applicable medium and can be used to treat various effluent and sewage containing inorganic and organic pollutants.

The invention relates to a method for measuring the content of pyrethroid pesticides in mainstream smoke of cigarettes and belongs to the technical field of tobacco chemical analysis. The method comprises the following steps of: extracting a sample by using acetone, purifying the sample by a self-prepared mixed chromatographic column, and detecting on a gas chromatograph; selecting an appropriate adsorbent according to the properties of complex matrixes of five pyrethroid pesticides and smoke, optimizing the using amount of the adsorbent, filling the five adsorbents or water absorbers into a glass chromatographic column from top to bottom, and activating by using 5 milliliters of acetone and 5 milliliters of normal hexane; and transferring sample test solution to be purified into the chromatographic column, eluting repeatedly twice by using 5 milliliters of mixed solvent of the acetone and the normal hexane in a volume ratio of 3:2 at the speed of less than or equal to 5.0 milliliters /minute, collecting eluent, concentrating to 0.5 milliliter on a rotary evaporator, fixing the volume to 2.0 milliliters by using the mixed solvent of the acetone and the normal hexane in a volume ratio of 3:2 to reach 2.0 milliliters, and analyzing on a gas chromatograph-electrochemical display (GC-ECD). The method has the advantages of simplicity, convenience, high efficiency and accuracy.

The invention discloses an electrostatic adsorption type floor sweeping robot, relates to the technical field of intelligent household appliances and aims at solving the problem that an existing floor sweeping robot is relatively low in cleaning efficiency. The electrostatic adsorption type floor sweeping robot comprises a chassis, wherein a sweeping mechanism is arranged at the bottom end of the chassis and comprises a fur brush and a rubber rod which are adjacently arranged; concretely, the fur brush can rotate to sweep sundries on the ground, and the fur brush and the rubber rod can produce static through friction and adsorb sundries. The technical scheme is mainly applied to manufacturing of floor sweeping robots.

The invention discloses a buried type cellaring method for white spirit, which comprises the following steps: selecting a ceramic spirit jar with a storage capacity of 100 kilograms, soaking with high-quality spring water for 7 days, drying in the air, feeding the white spirit, covering, binding a jar cover with high-quality kraft paper, sealing with mud, and standing indoor to observe for two months; pulverizing 20wt% of traditional bamboo charcoals, 3wt% of sorghum stalks, 8wt% of rice straws, 3wt% of wheat straws, 3wt% of cornstalks, 2wt% of Artemisia argyi leaves, and 1wt% of Radix Glycyrrhizae, adding 60wt% of bamboo forest loam, adding water and stirring uniformly; digging a groove for spirit storage in a bamboo forest hillside, wherein the groove has a length of 15 meters, a width of 3 meters, and a depth of 3 meters; and laying the prepared bamboo charcoal mixed soil to a thickness of 30 centimeters at the bottom of the groove, putting the no-leakage spirit-jars that are kept for two months after feeding in the step 1 on the bamboo charcoal mixed soil one by one with a distance of 30 centimeters between the jars, filling and covering with the prepared bamboo charcoal mixedsoil till the thickness of the bamboo charcoal mixed soil on the spirit-jars is more than 1 meter, and burying for five years.

The invention discloses a preparation method of a porous cellulose acetate micropellet adsorbent. The preparation method comprises the following steps: extracting cellulose acetate in a waste cigarette end filter tip by virtue of a soxhlet extraction method, facilitating the reaction between the processed cellulose acetate and calcium carbonate in an acetone solution to obtain prototype cellulose acetate adsorbing micropellets, and then dispersing and molding the prototype cellulose acetate adsorbing micropellets by using an ultrasonic washer to obtain the cellulose acetate adsorption micropellet adsorbent. According to the preparation method of the porous cellulose acetate micropellet adsorbent, firstly the cellulose acetate is extracted from the cigarette end filter tip by virtue of the soxhlet exstraction method, then the porous cellulose acetate micropellet adsorbent is prepared by using a reverse-phase suspension dispersion method, and the prepared porous cellulose acetate micropellet adsorbent has good adsorption effect on heavy metal ions such as Fe<2+> and Cd<2+>. According to the preparation method, the raw material is likely to get, and waste is used, so that not only is the preparation cost of a product decreased, but also the environmental pollution caused by the waste cigarette end is reduced.

The invention relates to a method for preparing expanded graphite load nanometer bismuth vanadate photochemical catalyst, which comprises the following steps: 1 adding bismuthate and stabilizing agent into phosphate buffer, stirring for 15 to 60 minutes to form turbid liquid, dissolving metavanadate into the phosphate buffer uniformly, adding the phosphate buffer into the turbid liquid, and stirring the solution to be uniform to form transparent solution; and 2 regulating potential of hydrogen (pH) value through alkaline solution, adding expanded graphite at the temperature of 20 DEG C to 100 DEG C, stirring, mixing, refluxing for 6 hours to 24 hours, centrifuging, filtering, washing, finally roasting the obtained products, cooling and grinding to obtain the final product. The method is low in cost, easy to apply and good in maneuverability and has low requirements for devices. The obtained expanded graphite powder bismuth vanadate is even in self-assembly, can efficiently degrade durable toxic and harmful substances under conditions of ultraviolet light and visible light, can be recovered and recycled easily and conveniently and is very suitable for deep processing of waste water.

The present invention relates to one kind o water processing functional suspended stuffing and its preparation technology, and the functional suspended stuffing is suitable for treatment of various kinds of waste water. Winged plates for stuffing, fixed connecting ring and middle connecting ring are made with polar plastic and connected to form an integral, and powdered functional water processing material is covered onto the surface of the winged plates via hot binding or adhesion with surface adhesive to constitute composite winged plates. The present invention has convenient making, great surface area, high water processing capacity and convenient maintenance with less back flushing needed.

One kind of hollow carbon is spherical and consists of carbon shell and hollow core. The preparation process of the hollow carbon includes adsorbing organic monomer reaction solution to spherical silica gel, initiating reaction to coat the silica gel with organic polymer, carbonizing the organic polymer, and dissolving the silica gel component in the core with alkali solution or acid solution. The hollow carbon in porous structure has great specific surface area and powerful adsorption capacity, and may be used in the treatment of waste water, pollutant, etc. and the hollow carbon in hollow core structure may be used as template material for the synthesis of other spherical material.

The preparation method of nano feed additive capable of reducing heaving metal residue in animal product, poultry product and aquatic product incldues the following steps: (1). uniformly stirring nano montmorillonite and sodium chloride by adding water to make them into ore pulp, washing with water to obtain ore pulp; (2) adding chitosan, stirring to make reaction, ageing, washing with water and dewatering; and (3), filtering and removing residue, drying and pulverizing. Said additive can make broad-spectrum absorptino of the elements of lead, cadmium, arsenic, mercury, nickel, tin and antiomony, its specific area is large and adsorptivity is strong.

The invention discloses a fruit tree fertilizer with bran as a main component. The fruit tree fertilizer is prepared from the following raw materials in parts by weight: 200-230 parts of bran, 100-120 parts of fermented cotton seed hulls, 120-140 parts of shiitake residues, 20-24 parts of flour, 20-24 parts of bentonite, 12-15 parts of zeolite powder, 12-15 parts of bamboo charcoal powder, 16-19 parts of potassium chloride, 10-12 parts of urea, 4-6 parts of ferrous sulfate, 3-5 parts of zinc sulfate, 2-3 parts of sodium sulfate, 1-2 parts of calcium lignosulphonate, 6-9 parts of an EM (Effective Microorganisms) bacterium agent, 10-15 parts of a soil conditioner, and an appropriate amount of water. With the bran, the fermented cotton seed hulls, the shiitake residues and the like as main raw materials, the fruit tree fertilizer is an organic fertilizer with rich nutrients and contains rich enzyme systems, proteins, carbohydrates, vitamins, mineral substances and the like, thereby having very high economic and social benefits. The added bamboo charcoal powder contains a large quantity of water-soluble mineral substances such as potassium, sodium, calcium and magnesium and has a powerful adsorbing capability, thereby being capable of adsorbing harmful substances such as heavy metals from soil and consequently playing a soil purifying role.