56results about How to "Improve ball forming" patented technology

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 relates to application of a shaft furnace to the roasting of full vanadium titanium iron ore concentrate pellet, which belongs to the technical field of the preparation method for the pellet. According to the method, the full vanadium titanium iron ore concentrate and 1.0 to 1.4 percent of bentonite are taken as raw materials which are used to prepare the full vanadium titanium iron ore concentrate pellet through even mixing, damp milling, pelletizing, drying and roasting, wherein the roasting temperature is 1,000 to 1,050 DEG C, and the roasting time is 30 to 60 minutes. The compressive strength of the full vanadium titanium iron ore concentrate pellet obtained by the method reaches 2,200N/piece. The pellet can be directly used for blast furnace smelting and also be used as a furnace protecting product during the blast furnace smelting of common ore.

The invention discloses a waste water treatment agent. The waste water treatment agent is prepared by using the following steps: 1, mixed fermenting, culturing and collecting pseudomonas pseudoalcaligenes and saccharomyces cerevisiae thalli; 2, mixing polyvinyl alcohol, calcium alginate, acrylyl and water according to a mass ratio of (6-15):(0.5-1.5):(3-5):100 to obtain a polyvinyl alcohol hydrosol, and adding the collected pseudomonas pseudoalcaligenes and saccharomyces cerevisiae thalli into the polyvinyl alcohol hydrosol to form a mixed solution; 3, adding the mixed solution into a saturated boric acid solution containing N'-methylene bisacrylamide CaSO4 by using a peristaltic pump to form a gel bead, cooling and unfreezing the gel bead, then cooling and unfreezing the gel bead again, placing in phosphate with the mass concentration of 0.2-0.5 g/L to obtain an immobilized cell bead with a spherical appearance and an internal porous mesh structure. The invention also discloses a method for treating waste water by using the treatment agent. Different heavy metals are well adsorbed.

The invention belongs to the field of comprehensive utilization of metallurgical residue resources and specifically relates to a preparation method of low-temperature solidified metallurgical pellets.In order to solve the problems that when steel and iron scrap powder are adopted for making pellets, the generated pellets are poor in forming performance, low in sintering intensity, likely to be pulverized and the like. The provided preparation method of the low-temperature solidified metallurgical pellets includes the following steps of a, taking and weighing vanadium titano-magnetite concentrates, steel and iron scraps and a compound bonding agent according to a mass ratio of (28-65):(34-68):(2-4), adding water, uniformly mixing the mixture, and conducting pelleting to obtain raw pellets;b, drying the raw pellets obtained in step a until the moisture content is lower than or equal to 1%, and obtaining dry pellets; c, preheating the dry pellets and conducting sintering to obtain finished pellet products. The preparation method is simple in operation, the prepared pellet products are high in strength, MFe of the finished pellet products is 55-58%, the compressive strength of each pellet is 2,600-3,100 N, the drum index is 90.0-93.5%, and the production cost is low. The new method is provided for comprehensive utilization of the steel and iron scrap powder, and obvious economicbenefits are obtained.

The invention discloses a treatment method for realizing comprehensive utilization of industrial acid pickling waste liquid and sulfate slag, which comprises the following steps: neutralizing acid pickling waste acid to obtain an iron-based chlorinating agent; adding the iron-based chlorinating agent into sulfate slag, mixing, and then granulating; and performing high-temperature chlorination roasting through a muffle furnace to obtain high-grade oxidized pellets, and simultaneously recovering metal chloride in flue gas to obtain rare precious metal powder which mainly comprises gold, silver, copper, zinc, lead and other valuable metal. According to the treatment method disclosed by the invention, the acid/base neutralization method and the high-temperature chlorination roasting method are combined, and the chloride in the steel rolling acid pickling waste liquid is converted into the chlorinating agent required for high-temperature chlorination roasting, so that the chloride in the waste liquid is effectively used as the valuable metal chlorinating agent, and the valuable metal is recovered, thereby solving the environmental problem and lowering the production cost.

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 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 provides a method for preparing a pyritic slag pellet raw material, which comprises the following steps: a) performing primary mixing on pyritic slag and water to prepare a mixture of which the water content is between 1 and 13 weight percent; b) performing ageing treatment on the mixture; and c) performing secondary mixing on the aged mixture, water and other iron-containing raw materials to prepare the pellet raw material. When the mixture is subjected to the ageing treatment, the water content in the mixture can fully moisten the pyritic slag, so that the capillary action of micropores of the pyritic slag can be better exerted to improve the ballability of the mixture. When green pellets are prepared from the pellet raw material comprising the mixture, the green pellets meeting technological requirements are prepared under the action of a binder and pores of the pellet raw material.

The invention provides a method for pre-treating iron ore concentrates, which comprises the following steps of: crushing the iron ore concentrates by adopting ball-milling and crushing the treated iron ore concentrates by adopting high-pressure roller-milling to increase the specific surface area of the iron ore concentrates to be 1,300 to 1,600 cm<2>/g. As the iron ore concentrates are pre-treated by adopting the ball-milling and the high-pressure roller milling, the method enhances the surface activity of red iron ore concentrate particles, improves the hydrophilicity of the surfaces of the iron ore concentrate particles, the pelleting performance of the concentrates, the pelleting intensity and the quality of pellet ore, reduces the volume of addition of bentonite, rises the cracking temperature and provides high-quality charging materials for blast furnace iron making.

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 relates to a magnetic separation column-anion reverse flotation optimizing beneficiation new process belonging to the technical field of beneficiation. The magnetic separation column-anion reverse flotation optimizing beneficiation new process comprises the following steps of: obtaining magnetic concentrates by adopting the conventional magnetic separation process; processing the magnetic concentrates by adopting a magnetic separation column, wherein the magnetic separation column selects two products, i.e. an overflow product and a sand setting product; obtaining qualified concentrates by controlling the ascending water and the ore discharge quantity of the sand setting product; also continuously carrying out a flotation regrinding process on magnetic separation column overflows; discarding tailings; enabling the qualified concentrates and magnetic separation column concentrates to be merged into final concentrates. The invention increases a magnetic separation column selection process before reverse flotation aiming at the problems of high cost, environmental pollution, and the like in the traditional magnetic separation-reverse flotation process, thereby effectively reducing the pressure of flotation; the invention obtains 20 percent of the qualified concentrates in advance before the flotation, thereby reducing the flotation ore quantity by 20 percent; and in addition, the invention also reduces the cost of a flotation procedure by 30 yuan/t, thereby obviously enhancing the economic benefits.

The invention discloses a pelletizing method for reducing bentonite consumption. Bentonite is adopted as a binding agent. The pelletizing method comprises the steps of mixing, pelletizing, drying and preheating and roasting. In the step of mixing, a mixture of Qing Gangping concentrate powder with the weight ratio of 50%-70% and XiChang South concentrate powder with the weight ratio of 30%-50% is adopted as pelletizing concentrate powder; and during mixing, water is firstly added to the bentonite to wet the bentonite, and then the bentonite is mixed with the pelletizing concentrate powder to form mixed powder. The bentonite is fully expanded through selective treatment on concrete powder raw materials and control over parameters in the bentonite mixing step, the concentrate power is in full contact with the bentonite, the effective utilization rate of the bentonite is improved, and therefore pelletizing quality is improved.

The invention provides an enhanced concrete internal curing high-water-absorption microsphere material and a preparation method thereof. The enhanced concrete internal curing high-water-absorption microsphere material is prepared from the following raw materials: nano silicon dioxide, chitosan, glutaraldehyde, Arabic gum, methacrylic acid, glacial acetic acid, cumene hydroperoxide, ferrous chloride and sodium ethoxide. By improving the transition area of the cement paste and the aggregate and modifying the microstructure in the cement-based material, the porosity is reduced, and the mechanicalproperty is improved. The whole preparation process flow is relatively simple, professional technicians do not need to operate and guide, and only the operation is carried out according to the description of the invention. The strength, durability, service life and the like of cement concrete are obviously improved by the reinforced concrete internal curing high-water-absorption microsphere prepared by the method disclosed by the invention.

The invention discloses a vanadium-titanium alkaline pellet production method. The vanadium-titanium alkaline pellet production method comprises the following steps: S1, mixing 80 parts by weight of limestone powder with 20 parts by weight of bentonite to prepare alkaline bentonite; S2, adding 4-6 parts by weight of magnesia bentonite into 100 parts by weight of iron ore powder, adding 1.3-1.5 part of bentonite, and adding 0.2 part by weight of magnesia bentonite as a material mixture; S3, uniformly mixing the material mixture through a mixer; S4, transporting alkaline bentonite into a circular disc pelletizer, adding the material mixture and water, and pelletizing to obtain fresh pellets, wherein the diameters of the fresh pellets are 1-20 mm; and S5, sequentially performing screening, drying, pre-heating, roasting, kiln head distributing, kiln head cooling and ring cooler cooling on the fresh pellets, thereby obtaining vanadium-titanium alkaline pellets. The vanadium-titanium alkaline pellet production method improves pelletizing and pellet-forming performance, is beneficial for green pellet roasting, improves a condition that powder is much and atmosphere is poor in a roasting process, can achieve the mass production target in a chain-grate machine-rotary kiln pellet production process, and only reduces yield ratio design ability by about 15%.

The invention discloses a magnetic whole-cell catalyst, a preparation method and a method for producing biodiesel. The preparation method includes the steps that firstly, pseudomonas mendocina cells are cultured and collected; secondly, SiO2-Fe3O4 nanoparticles are taken and added into a sodium alginate solution, the bacterial cells obtained in the first step are added after uniform stirring, and a mixed solution is obtained after uniform mixing; thirdly, the mixed solution is added into a sterile CaCl2 aqueous solution drop by drop under the stirring condition, still standing is carried out, magnetic microspheres are attracted out through a magnet and cleaned, and the magnetic whole-cell catalyst is obtained. The particle diameter of the prepared magnetic whole-cell catalyst is 2-6 mm, biological activity is high, and stability is good. In a biodiesel preparation reaction system, the magnetic whole-cell catalyst can be directly separated and extracted through the magnet and repeatedly used. The catalyst is easy to recycle, stable, easy to operate, moderate in condition, high in adaptability and safety and capable of reducing production cost of the biodiesel.

The invention relates to a preparation method of a copolymer of olefin and unsaturated carboxylic acid and the copolymer prepared by the method. The method comprises the step of polymerizing olefin and unsaturated carboxylic acid in the presence of a catalyst, an improver, an optional chain transfer agent and an improver, wherein the used catalyst comprises a diimine metal complex as shown in a formula I which is described in the specification. The spherical and/or sphere-like polymer prepared by the preparation method has a good prospect in industrial application.

The invention relates to a preparation method of a polar group-containing copolymer and the polar group-containing copolymer prepared by the method. The preparation method of the polar group-containing copolymer comprises the following step: carrying out polymerization reaction on olefin and olefin alcohol in the presence of a catalyst, an improver and an optional chain transfer agent, wherein the used catalyst comprises an amino imine complex as shown in a formula I. The spherical and/or sphere-like polymer prepared by the preparation method has a good prospect in industrial application.