187results about How to "Good ball forming" patented technology

The invention relates to a sintering technology of ferrochrome mineral powder, which comprises the following steps: adding bentonite binder, fuel and water for uniform mixing after more than 65 percent of mineral powder is ground to -0.074mm, and pelletizing; then, coating a layer of fuel on the surface of the spherulite; loading the product into a sintering machine, with the height of the material layer being 550 to 700mm; and igniting for sintering after drying and preheating, and cooling, smashing and sieving thermal sintered ore, thus obtaining the finished product sintered ore with particle size of 3-40mm and return mineral powder with particle size of -3mm. The technology has simple method and convenient operation, and by activating chromite, the technology reduces the reaction temperature, improves strength and output of the sintered ore, saves consumption of solid fuel, has strong adaptability to material, can realize industrialized production, and is especially suitable for sintering of granular ferrochrome mineral powder or ferrochrome concentrate.

The invention relates to an acid amide-grafted sodium alginate nanometer material, a preparation method thereof and use thereof. The acid amide-grafted sodium alginate nanometer material comprises acid amide having an aliphatic chain and sodium alginate having a molecular weight of less than or equal to 50,000, and is characterized in that a carboxyl group of the sodium alginate is grated with hydrophobic acid amide by a chemical synthesis method for hydrophobic modification so as to form an amphipathic material, namely a modified sodium alginate nanometer material, having both hydrophobicity and hydrophilcity. The acid amide-grafted sodium alginate nanometer material performs self aggregation in deionized water to form nanoparticles, wherein the diameter of the nanoparticles is between 40 and 1,000 nanometers; under a condition of substituted ratio of 2 percent, the mean particle diameter of the nanoparticles is 596.2 nanometers; the medicament-loading rate is up to 40 percent; the medicament entrapment rate is up to 95.1 percent; and the medicament release time is as long as 6 days. The acid amide-grafted sodium alginate nanometer material can be used in a plurality of pharmaceutical fields as a slow release carrier of a plurality of medicaments, particularly hydrophobic medicaments, protein medicaments, polypeptides and vaccines.

The invention discloses a method for preparing a high-nickel concentrate from a low-grade red soil nickel ore, which comprises the following steps of: drying the low-grade red soil nickel ore until water content is 13 to 16 percent, crushing to ensure that the size of all particles is less than 3mm, grinding by using a high-pressure roller mill to ensure that particles with the size of less than 0.074mm account for 80 percent and specific surface area is not less than 2,000cm<2>/g, adding 15 to 20 percent of composite binder and 1 to 5 percent of coal powder, and pelletizing by using a disc pelletizer to obtain green pellets with the size of 6 to 16mm; drying and preheating the green pellets on a chain grate for water removal and solidification to ensure that each piece of pellet entering a kiln has the compression strength of over 500N; directly adding the preheated and solidified pellets into a rotary kiln, and reducing at the temperature of between 1,100 and 1,250 DEG C for 60 to 120 minutes by using pea coal as a reducing agent in a mass ratio of the reducing coal to the pellets of 0.8-1.0; and cooling a reduction product, sieving, performing magnetic separation to obtain a magnetic product, crushing, grinding, and performing magnetic separation to obtain the high-nickel concentrate, wherein the composite additive comprises the following components: Na2CO3 and CaO, iron oxide powder, the coal powder and sodium humate in a ratio of (30-60):(20-30):(20-30):(5-10). The method is high in adaptability and nickel recovery rate and suitable for mass production.

The invention relates to a pelletizing method using sludge of steel production and belongs to pelletizing technology in metallurgy field. The method comprises: adjusting sludge concentration to 10-40%, adding 3-10% (weight percentage) sludge in mixture of iron ore powder and bentonite, continuously spraying it in palletizing disk, The advantage of the method : material sphericity is improved greatly. Bentonite usage can reduce greatly in mixture, which promote the pelletizing quality. Pelletizing disk don't take on sandification. Aqueous sludge can minimize the extra water. The enterprise has electric furnace, open-hearth furnace, revolving furnace and pelletizing line can use the method.

The invention is specially related to method for preparing nano/micron microsphere with superparamagnetism through silanization. SiO2 with different content and number of layer are utilized to cover surface of Fe3O4 nano granule of new prepared in order to control grain size and avoid agglomeration. Then, under a moderate condition, silanization is carried out for surface of magnetic microsphere with silicon covered so as to obtain superparamagnetism microsphere with functional groups on surface. Grain size is in 30 nm-1000 nm/1-20 um. Magnetic Fe3O4 is in 0.5-60% (weight percent) of whole microsphere. The invention features of controllable grain size, good sphericity, even magnetism content, and stable physical and chemical performances.

The invention relates to a low-grade iron ore direct reduction method, which comprises: calculating and taking a certain amount of coal powder, an additive, a binder and water by adopting the dry basis mass of iron ore to be treated as reference; uniformly mixing the taken components, and completely wetting to obtain an internal matching coal; uniformly mixing the internal matching coal and iron ore particles to be treated, and granulating to obtain granulated pellets; directly conveying the obtained granulated pellets into a rotary kiln, carrying out drying, pre-heating, and reduction roasting to carry out coal base direct reduction so as to obtain a reduced material, cooling the reduced material in the absence of air, and carrying out dry magnetic separation to obtain the reduced roasting pellets and the residual carbon; and carrying out treatments such as ore grinding and magnetic separation on the reduced roasting pellets to obtain iron concentrate, or carrying out re-grinding and re-magnetic separation to obtain the reduced iron powder, wherein the obtained residual carbon can be recycled. With the method of the present invention, the low-grade iron ore can be effectively treated, the internal matching coal and the additive are used to granulate, the wet pellets enter the kiln, the coal base direct reduction is performed, the magnetic separation is performed to obtain the high-grade iron concentrate or the directly-reduced iron powder, and the method has characteristics of energy saving, high efficiency, and rapidness.

The invention discloses a preparation method based on single crystal copper bonding wire. The preparation method of the single crystal copper bonding wire is divided into two steps: (1) using continuous casting single crystal copper rod as the single crystal copper The starting material of the bonding wire, at the same time, the single crystal copper bonding wire is drawn by the drawing equipment driven by the AC servo motor with the microcomputer program control, active wire release, and the pulling force accuracy is less than 1mN; (2) The drawn single crystal copper bond The bonding wire is treated with electroplating precious metal palladium with a surface thickness of 0.5um~1um and an organic epoxy coating with a thickness of 1um for double-layer protection; in this way, a single crystal copper bonding wire with multiple protective coatings is finally obtained. Bonding wire has the advantages of low price, high elongation, good mechanical and electrical properties, and good oxidation resistance.

A composite additive for preparing hematite concentrate pellets comprises the following components: humic acid, calcium peroxide, and paigeite. During application, the composite additive is added which has a mass percent of 0.5%-1.6% of the total mass of the hematite concentrates, and the finished product pellets are obtained by pelletization, preheating, and roasting. Compared with pellets prepared by traditional technology, the hematite pellets prepared by the composite additive of the invention have improved falling strength of the green pellets, and compression strength of the finished product pellets; the preheating temperature and roasting temperature suitable for the pellets are reduced; both the preheating time and roasting time are shortened; the TFe grade is increased by 0.8%-1.2%. The composite additive of the invention has reasonable component ratios, is easy to process and manufacture, has a low using amount and a low residual amount, can significantly improve the pelletability of hematite concentrates which are difficult to be palletized, can improve the green pellet quality, has good heat stability, and can effectively reduce the preheating and roasting temperatures and shorten the preheating and roasting time of hematite concentrates. The composite additive of the invention is applicable to the production of oxidized pellets by hematites, and is especially applicable to the production of oxidized pellets by specularites. The composite additive of the invention is applicable to large-scale industrial production.

The invention discloses multi-medicament loaded calcium phosphate cement powder. The multi-medicament loaded calcium phosphate cement powder is prepared by directly mixing more than one prophase release medicament, polymer microspheres loaded with a long-term release medicament and calcium phosphate cement powder, or performing precipitation blending on more than one prophase release medicament and an ingredient in the calcium phosphate cement powder and uniformly mixing the obtained product with other ingredients of the calcium phosphate cement powder and the polymer microspheres loaded with the long-term release medicament. The powder is suitable for filling and repairing bone defects with different volumes and different shapes; moreover, the loaded prophase release medicaments and the loaded long-term release medicament can be released for co-administration in different time sequences at local positions of the bone defects; and the powder, through the synergism, enhances therapeutic effect, promotes bone healing, improves the success rate of clinical filling and repair of the bone defects, and can reduce the side effect of the medicaments on organisms and meet the clinical demand on bone filling and repair materials at the same time.

The invention discloses a preparation method of a sodium alginate-MOFs composite microsphere for adsorbing heavy metal selenium. The preparation method comprises the steps: adding MIL-101 into a sodium alginate solution, and carrying out stirring; then, adding a CaCl2 water solution, and carrying out a crosslinking reaction to obtain a composite microsphere; and finally, carrying out microwave treatment in a microwave reaction cavity to obtain a sodium alginate-MOFs composite microsphere water body purifying material; the sodium alginate solution refers to a sodium alginate solution having themass percentage concentration of 0.5-3.0% and taking water as a solvent; the stirring refers to the step of carrying out uniform stirring under a room temperature condition by using an electromagnetic stirrer, and then, ultrasonically removing air bubbles; the CaCl2 water solution refers to a CaCl2 water solution having the concentration of 0.05-1.50mol/L and taking water as a solvent; and the microwave treatment refers to the step of carrying out treatment at the power of 300W-1200W for 3-45min. The preparation method has the characteristics such as simple preparation process and conveniencein use.

The invention belongs to the technical field of superparamagnetism functional materials, and discloses a Cu2+-EDTA-Fe3O4 magnetic grain with the surface decorated with a large number of copper ions, a preparation method of the Cu2+-EDTA-Fe3O4 magnetic grain, and application of the Cu2+-EDTA-Fe3O4 magnetic grain in the bio-medical field. The Cu2+-EDTA-Fe3O4 magnetic grain is particularly suitable for separating histidine proteins. The magnetic grain is prepared through the following steps of preparing an EDTA-Fe3O4 magnetic grain through a hydrothermal method, adding the EDTA-Fe3O4 magnetic grain to a water-soluble copper salt solution, and obtaining the Cu2+-EDTA-Fe3O4 magnetic grain through chelation. The magnetic grain is spherical and high in dispersibility and has the grain size of about 150 nm and the magnetic saturation of 69 emu/g. Through the strong coordination of Cu2+ with which the surface of the grain is decorated and histidine residues on surfaces of hemoglobin, the superhigh adsorption capacity is achieved for hemoglobin, the adsorption capacity can reach 1250 mg/g, no obvious adsorption effect is achieved for serum albumin, excellent selectivity is expressed, and the removal efficiency is larger than 90%.

The invention provides a method for improving the grade of low-grade iron ore. The method comprises the following steps: respectively pretreating low-grade iron ore and coal, adding coal dust and an additive according to a certain proportion and preparing small balls with particle sizes of 3 to 8 mm by using a disc or drum balling machine after the content of treated iron ore and coal with a particle size of 0.074 mm is more than 50%, wherein clay minerals in the low-grade iron ore are used as a binder, or a small amount of binders like bentonite is added and uniformly mixed with treated iron ore and coal; and drying the prepared balls with a belt or cylindrical dryer, carrying out reduction by using a rotary kiln and then successively carrying out cooling and magnetic separation so as to obtain high-grade iron ore concentrate. With the method, low-grade iron ore can be effectively treated, the high-grade iron ore concentrate is obtained through granulation of the coal and the additive, direct reduction and magnetic separation, and the characteristics of energy conservation, high efficiency and rapidness are obtained.

The invention discloses a technology for producing a metal furnace burden for a high-quality electric furnace by a coal-based method, and belongs to the field of direct iron ore concentrate reducing technologies. The technology comprises the following steps: (1) blending: drying hematite concentrates, then performing mechanical activation, grinding anthracite powder, and blending and mixing the hematite concentrates, the anthracite powder, slaked lime and an adhesive; (2) balling or ball pressing: balling or pressing the mixed raw materials in the step (1) to obtain pellets or blocks; (3) mixture wrapping: wrapping the produced pellets or blocks with a layer of mixture consisting of the anthracite powder, the slaked lime and polyacrylamide powder; (4) drying and reduction: drying the pellets or blocks wrapped with the mixture in the step (3), and then putting the pellets or blocks into a rotary hearth furnace. The metal furnace burden produced by the technology can directly meet the requirement on electric furnace production and is used for partially replacing waste steel for the electric furnace.

The invention discloses a method for utilizing sulfate slag and red mud comprehensively. The method comprises the steps that the sulfate slag and the red mud are mixed with a reducing agent so as to obtain a mixed material; roasting is carried out on the mixed material so as to obtain a reduced iron product; the reduced iron product is separated so as to obtain iron powder. By the utilization of the method, the two metallurgical solid waste resources, namely the red mud and the sulfate slag are utilized comprehensively, so that the iron product with good indexes is obtained.

The no-lead Sn-base soft solder for preparing BGA tin ball consists of Ag 1.1.5-5.0 wt%, Cu 0.3-0.9 wt%, RE 0.001-0.2 wt%, Ge 0.001-0.2 wt%, and Sn for the rest. Or, it consists of Ag 2.1.5-5.0 wt%, Cu 0.3-0.9- wt%, RE 0.001-0.2 wt%, Ge 0.001-0.2 wt%, Bi 0.05-1.5 wt%, and Sn for the rest. The present invention is suitable for no-lead assembling and packaging in electronic industry.

The invention discloses a preparation method of a cross-linked chitosan resin. The method provided by the invention comprises reaction liquid preparation, resin producing, and resin pretreatment. Main steps comprise: (a) a chitosan solution is prepared and is added into paraffin; (b) a stirring device is started and a resin producing reaction is carried out; (c) obtained resin is filtered, washed, and is subjected to an impurity-removing treatment; and (d) the resin is pretreated. With the method provided by the invention, cross-linked chitosan resin with excellent pelletization performance and relatively high adhesion performance can be prepared.

The invention provides a preparation method for an immobilization particle used for reducing activated sludge. The preparation method comprises the following steps: uniformly mixing fermentation broths of corresponding strains according to a weight ratio of Bacillus subtilis to Bacillus cereus to Bacillus megaterium to Bacillus licheniformis to Bacillus pumilus of 4-6: 4-6: 6-9: 5-7: 4; preparing bacterial powder from the above mentioned mixed bacterial liquid through spray drying; and preparing the immobilization particle by using a PVA-saturated boric acid method. By using an immobilization method, high-efficiency sludge degrading bacterial strains are embedded, so the concentration of the sludge degrading bacterial strains participating in a reaction can be greatly increased, the bacterial strains are vulnerable to loss and dying, have longer action time and obviously improved antitoxin capability and tolerance, solid-liquid separation can be easily realized, and secondary pollution is small.

The invention provides a preparation method of a zinc-containing dust pellet. The preparation method comprises the following steps of S1, carrying out burdening , mixing the blast furnace cloth bag ash, the steel-making ladle furnace ash, the steel-making converter smoke dust and other zinc-containing dust with the carbon-containing fine powder to obtain a mixture; S2, carrying out pretreatment, adding water into the mixture obtained in the step S1 for wetting, and piling up and curing after wetting; S3, adding a composite binder into the cured mixture, and carrying out uniformly mixing to obtain a uniform mixture; S4, carrying out pelletizing on the uniformly mixed material prepared in the step S3 to obtain a green pellet; and S5, drying the green pellet in the step S4 to obtain the zinc-containing dust dry pellet. The dry pellet has the advantages of high compressive strength and good reducibility, the metallization rate is high in the direct reduction process, the dezincification effect is good, and the preparation method solves the technical problems that an existing zinc-containing dust pellet is easy to break and pulverize in the reduction process.

The invention provides a preparation method of a magnetic immobilized enzyme, relating to a preparation method of a novel carrier PVP-DB-171 (polyvinylpyrrolidone-vinyltrimethoxysilane)/SiO2/Fe3O4. The invention aims to solve the problem that the free enzyme is sensitive to the reaction environment and can not be recovered and the problems of high production cost and the like, and thus, the free enzyme is immobilized in the nano magnetic carrier PVP-DB-171/SiO2/Fe3O4. The magnetic immobilized enzyme is an enzyme with magnetic response characteristic and has operational stability; and the nano immobilized enzyme is uniformly dispersed in the liquid phase. The magnetic response performance can be utilized to achieve the goal of completely separating the immobilized enzyme from the reaction medium. The active recovery rate of the finally obtained immobilized enzyme is 85%; and the enzyme activity after 10 times of repeated use is kept at 70% above.

The invention belongs to metallurgical raw materials and pretreatment technology, and in particular relates to a novel binder for metallurgical pellets. The novel binder for the metallurgical pellets consists of the following components in part by weight: 100 parts of natural calcium-based bentonite, 2 to 5 parts of sodium carbonate and 1.1 to 2.0 parts of sodium cellulose, wherein the natural calcium-based bentonite is natural calcium-based bentonite with montmorillonite content of more than 54 percent. The preparation method comprises the following steps of: adding 2 to 5 weight parts of sodium carbonate into 100 weight parts of natural calcium-based bentonite for sodium treatment, drying until the moisture content is below 12 percent, performing ore grinding until the ore with granularity of less than 43 microns is over 90 percent, adding 1.1 to 2.0 weight parts of sodium cellulose, and stirring and uniformly mixing to prepare the novel binder for the metallurgical pellets. The pellet forming property of green pellets can be effectively improved, the cracking temperature of the green pellets is improved, the metallurgical property of pellet ore is improved, and the binder has the effects of increasing the yield and reducing the consumption for the production of the pellet ore.

The invention discloses a method for preparing a monodisperse nanosphere medicine carrier, which comprises the following steps: dissolving poly(lactic-co-glycolic acid) in organic solvent to form an organic phase; dissolving emulsifier in distilled water to form a water phase; under the synergistic effect of ultrasound and stirring and in an ice water bath, adding an organic phase into a water phase according to a volume ratio to obtain oil-in-water emulsion; continuously stirring the emulsion at normal temperature for 4 to 20 hours, and removing organic solvent; and performing low-speed centrifugation to remove aggregate, subjecting supernate to ultrafiltration, refrigeration, centrifugation and washing to obtain the monodisperse nanosphere medicine carrier. In the monodisperse nanospheres, the spherical shape is regular, the particle size is between 100 and 500 nanometers, the size is controllable and the specifications are uniform. The monodisperse nanospheres are suitable for coating and carrying various water soluble or liposoluble medicines and have the advantages of biodegradability, controlled medicine release and the like.

The invention discloses the globe group chemic additive used in the mine, it is the powder duplicating mix compound. The granularity exceeds 200 items, the team element (the weight percent): the adding adhesive is 30-50%; the adding oxygen activator is 10-25%; the intensifying reagent is 10-25%; the carrier is 30-50%. The produced additive has not Si, AL, K, Na element which are harmful for the piddling. It can replace fully the expanding moist soil in producing the ball and is need to depress the quality of the globe group mine, the request of the quality can be reached and exceeded with the adding of the 0.4-0.6% additive in the globe group material, the ability of the metallurgy under the high temperature in the globe group material can be improved highly. The function of the additive exceeds the function of the expanding moist soil highly.

The invention discloses collagen-polyvinyl alcohol embolism microspheres loaded with iodine 131 and a preparation method thereof. The preparation method comprises the following steps: firstly, carrying out a crosslinking reaction on polyvinyl alcohol and type I collagen to prepare collagen-polyvinyl alcohol embolism microspheres, and then carrying out radioactive iodine 131 labeling on the collagen-polyvinyl alcohol embolism microspheres to obtain iodine 131-collagen-polyvinyl alcohol embolism microspheres. The embolism microspheres prepared by the invention not only can slow down the growth speed of tumors and prolong the longest lifetime of patients, but also have the advantages of small specific gravity, easiness in perfusion, long half-life period and capability of releasing gamma raysfor imaging monitoring, do not need expensive activation equipment, and are beneficial to reducing the cost.