230results about How to "Short calcination time" patented technology

A process for preparing high-activity lime by vacuum calcining of lime stone includes such steps as crushing lime stone, loading in tank, heating in electric vacuum furnace at 750-900 deg.C under 100-1000 Pa, and quick cooling. Its activity is 380-450 ml.

The invention discloses a regeneration method for an inactivated TiV-based honeycomb denitration catalyst having the combined denitration and demercuration modification function. Firstly, the physical and chemical properties of an SCR denitration catalyst are detected, and the inactivated reasons of the catalyst are analyzed. Secondly, the regenerable catalyst is subjected to ultrasonic cleaning in deionized water, a strong alkaline solution or a strong acid solution, so that deposited ashes and pernicious elements in the catalyst can be removed. Thirdly, the cleaned catalyst is immersed in a combined denitration and demercuration regeneration solution, until the activity of the catalyst is stable. Finally, the activated catalyst is transferred to a microwave oven to be dried and calcined through the microwave heating process. The catalyst, obtained through the above method, successively has the combined oxidation and demercuration capacity, while the denitration activity of the catalyst is recovered at the same time. At a temperature smaller than 350 DEG C, the denitration efficiency of the catalyst is up to be equal to or over 90%, and the demercuration efficiency of the catalyst is up to be equal to or over 90%. Meanwhile, the condition that the cost is increased due to the demercuration process after the flue gas denitrification process can be avoided. Therefore, the method is economical and environmentally-friendly, thus being suitable for industrial promotion.

The invention relates to road delayed-coagulation cement and a preparation method thereof. The road delayed-coagulation cement comprises special cement clinker, limestone waste, modified steel slag powder and phosphorus gypsum. According to the road delayed-coagulation cement, a cement raw material is prepared from carbon-containing shale, the phosphorus gypsum serves as mineralizing agents of clinker calcination, steel slag powder is prepared in a crushing, iron removing and grinding manner, the steel slag powder and the limestone waste serve as cement admixtures, and the phosphorus gypsum serves as a cement delayed coagulant. By the aid of the technical scheme, the prepared road delayed-coagulation cement has the advantages that coagulation time is suitable, early strength is high, laterstrength is rapidly increased, breaking strength is high, abrasion resistance is good, dry shrinkage performance is low and the like. Efficient resource utilization of solid waste such as the carbon-containing shale, the limestone waste, steel slag and the phosphorus gypsum is achieved, and the road delayed-coagulation cement has important economic benefits and social benefits.

The invention relates to a meta titanate treatment method, comprising the following steps of: pulping metatitanic acid; adding an alkaline compound into the metatitanic acid pulp until the pH value is above 3; filtering and washing; adding dissoluble aluminum salt, dissoluble phosphate, dissoluble potassium-containing compounds and zinc-containing compounds into a filter cake and mixing uniformly; and calcining and crushing to obtain titanium dioxide. Compared with the prior art, the meta titanate treatment method provided by the invention has the advantages that the energy consumption is reduced; the production efficiency is improved; and the mellowness of the titanium dioxide is improved.

The invention discloses a preparation method of molybdenum bismuth vanadate yellow pigment. The method includes: taking Bi2O3, V2O5 and MoO3 as raw materials, adopting an alkali metal nitrate as a molten salt medium, conducting ball milling to obtain a powder precursor, and then preparing the molybdenum bismuth vanadate yellow pigment by a molten salt technique. The method provided by the invention utilizes the liquid environment provided by the molten salt medium to effectively lower the calcination temperature for product synthesis and shorten the time of heat preservation, thus helping to reduce energy consumption, and also avoiding the problem of great acid and alkali consumption in a liquid phase precipitation-calcination method. Therefore, the method is conducive to production cost reduction. The raw materials involved in the method are easily available, the product has good quality and uniform particle size distribution, the preparation process is simple and is easy to realize industrialization.

The invention discloses a garnet-structure lithium lanthanum tantalate-based solid electrolyte material and a preparation method thereof. The lithium lanthanum tantalate-based solid electrolyte material is a compound of Li5La3Ta2O12 doped at the lanthanum site and/or tantalum site; and the preparation method comprises the following steps: dissolving tantalum pentoxide in a H2C2O4 solution; adding lithium salt and lanthanum slat and the salt of a lanthanum site-doped compound and/or the salt of a tantalum site-doped compound, and mixing to obtain a solution; adding EDTA into the obtained mixed solution for reaction until transparent and clear sol appears; adding a water-soluble high-molecular polymer and continuously reacting until gel appears; drying the obtained gel and calcining; performing mould pressing of the calcined particles to obtain a blank; and further calcining the blank to obtain the solid electrolyte material. The preparation method is mild in conditions, simple in process and simple to operate, and can realize industrial production; the prepared solid electrolyte material has good electrochemical stability and relatively high electrical conductivity, and can be used for preparing an all-solid-state lithium ion battery.

The invention discloses a method for preparing inorganic mineral polymers through lead and zinc mine tailings. The method includes the steps that activating treatment is carried out on the lead and zinc mine tailings through the wet-process alkalize calcination, alkali-activator is added for inorganic polymerization reaction after metakaolin and sand are added and stirred, the inorganic mineral polymers of a net structure are formed, and a foaming agent and a foam stabilizer can be added into the obtained inorganic mineral polymers to be further prepared into foamed inorganic mineral polymers. The obtained finished inorganic mineral polymers are good in durability, have good high temperature heat insulating property, will not release poisonous substances even when exposed in flame, and can be used for backfill and sealing after a mine is mined, building materials and other aspects. Not only can the stacking problem of the lead and zinc mine tailings be effectively solved and environmental pollution be reduced, but also a new path is developed for developing and utilizing waste lead and zinc mine tailings in China, a new exploration direction is provided for relevant research on recycling of tailings, and the method has a great significance to energy conservation, emission reduction, environmental protection, waste utilization and creation of the environment-friendly society.

The invention relates to a method for adopting a compound reducing agent to reduce and decompose phosphogypsum; the method comprises the following steps of: using high-sulphur coal and coal gangue to prepare the compound reducing agent; utilizing tail gas to dry the phosphogypsum and the compound reducing agent which are ground and mixed evenly and then transferred into a reducing and decomposing furnace; carrying out reduction and decomposition till the reaction is completed. The invention makes full use of sulphur in the high-sulphur coal and the coal gangue to produce stable SO2 with high concentration and provides qualified feed gas for acid-making technique; calcium sulfate is reduced and decomposed to obtain calcium oxide slag which is taken as raw material for producing cement. The method of the invention reduces the reaction temperature and energy consumption, lowers the production cost, is beneficial to reducing energy consumption, reduces the production cost further without causing secondary pollution, thus providing a new path for the comprehensive utilization of the coal gangue and the phosphogypsum and realizing energy-saving and emission reduction. The invention also develops potential sulfur resources and can bring good economic benefit, thus forming an industry chain of circular economy for wet-process phosphoric acid enterprises.

The present invention discloses Lithium lanthanum bismuthate-based solid electrolyte material and preparation method thereof. The chemical formula of the material of Lithium lanthanum bismuthate-based solid electrolyte after the doping of lanthanum and the doping of lithium are conducted is La(3-x)AxLi(5+delta)Bi(2-y)ByO12. In the formula, A is the lanthanum position dopant, X is a value from 0 to 1.25, B is the bismuth position dopant, and Y is a value from 0 to 1.25. The preparation method of the material is as follows: according to the formula, weighing nitrates or carbonates or chlorides or acetates or alkoxides or oxides soluble in acids of lithium, lanthanum, bismuth, the lanthanum-position dopant and/or the bismuth-position dopant, preparing a solution by using the above chemicals,adding a lanthanum salt solution, a bismuth solution, a solution of lanthanum-position dopant and/or a solution of bismuth-position dopant dropwisely, adding citric acid and nitric acid successively to obtain a sol, adding a water-soluble polymer into the sol to form a gel, drying the gel, performing heat treatment to obtain nanocrystal powder, moulding the powder into a green body, and calciningto obtain the Lithium lanthanum bismuthate-based solid electrolyte material. The prepared material can be used as a solid electrolyte material and can be applied to all-solid-lithium ion battery.

The invention relates to the technical field of soil remediation, in particular to a soil conditioner as well as a preparation method and use method thereof. The soil conditioner comprises the following components in percentage by weight: 40-60% of copper tailings, 20-40% of fluorite tailings or limestone, 6-20% of talc, serpentine or dolomite, and 2-5% of a pellet curing agent, wherein the totalweight is 100%; and the copper tailings include quartz, alunite and dickite. The preparation method comprises the following steps: step 1, weighing the components and mixing the components uniformly;sep 2, preparing the mixture obtained in the step 1 into pellets; step 3, calcining the pellets at a temperature of at least 1000 DEG C for at least 1.5 hours; and step 4, cooling activated pellets and performing ball milling to obtain the soil conditioner. The soil container contains non-ferrous metal and non-metallic ores, various major, medium and trace elements necessary for the growth of crops, fruit trees and seedlings, and basically no additional major, medium and trace elements need to be added.

The invention belongs to the technical field of the removal of residual carbon in siliceous dust, and particularly relates to a method for desorbing residual carbon in siliceous dust by means of oxygen-enriched calcination and a device for desorbing the residual carbon in the siliceous dust by means of oxygen-enriched calcination. The removing method provided by the invention comprises the step of calcining the siliceous dust which contains the impurities and is under the fluidized state for 1-2minitues under the temperature of 600-800DEG C and the condition of oxygen enrichment, wherein the condition of oxygen enrichment means that the oxygen mole fraction in the gas is 30-34% in the process of calcining. The removing device provided by the invention comprises a fluidized bed calcining tower, a burning mechanism, a temperature measurement mechanism, a blasting mechanism, a material transporting mechanism, an oxygen supply mechanism and a product collecting mechanism. The invention adopts a fluidized bed calcining technology under the state of oxygen enrichment, and the oxidation speed of the residual carbon in the siliceous dust can be effectively accelerated in the process of calcining under the state of oxygen enrichment, so that the calcining time can be shortened; and the calcining can be carried out under the state of fluidization, so that the fusion and the bonding coalescence among silica particulates in the siliceous dust can be effectively avoided, and the diameters of the fine particulates can be guaranteed to be invariable.

The invention discloses a hollow nickel molybdate nanoflower assembled by nanosheets and a preparing method of the hollow nickel molybdate nanoflower assembly. The preparing method comprises the stepsof using Ni(NO3)2.6H2O and (NH4)6Mo7O24 as raw materials, adopting ammonium hydroxide as a solution PH modifier and a catalyst, using microemulsion formed by CTAB, cyclohexane, ethyl alcohol and water as a template, and preparing the hollow nickel molybdate nanoflower material through a hydrothermal reaction and calcination treatment. The hollow nickel molybdate nanoflower assembled by the nanosheets is of an obvious hollow structure, compared with a pure spherical structure, the specific surface area can be increased through the hollow structure, so that the contact area of an electrolyte and the hollow nickel molybdate nanoflower assembled by the nanosheets is increased; electrochemical properties are improved; framework base materials are not needed, the mass is low, and raw materialsare saved.

The invention relates to a lime kiln device with hot-air calcination and a method for producing lime by the utilization of the lime kiln device. When preparing lime, hot air generated from a combustion apparatus outside a kiln is used for calcination of limestone; waste hot air used after the calcination is used for preheating of the limestone mineral aggregate; the waste hot air used after preheating is discharged out of the kiln body, and then undergoes dedusting and finally used for preheating of coal gas and oxidizing air. Through the use of hot air for calcination of limestone, lime quality can be remarkably improved, lime yield is raised, and productivity is enhanced. The lime kiln proposed by the invention is not provided with a burner system, and the hot air for high temperature calcination is from a combustion furnace device outside the kiln. Blast-furnace gas can be used as a fuel for the combustion furnace device, and hot flue gas generated by the combustion device can be used as the hot air. Thereby, the kiln structure is simplified, and operating cost of the lime kiln is reduced.

The invention discloses a production process of active lime. The process comprises the following steps of (1) screening and pretreatment of limestone, (2) mixing, (3) preheating, (4) calcining, (5) cooling and (6) post-treatment. Firstly, an additive used in the production process reduces underfiring and overburning of the lime, increases the decomposition speed of CaCO3, shortens the calcining time, correspondingly reduces the energy consumption and is beneficial to industrial popularization. Furthermore, carbon is also added, decompression operation is adopted after preheating and before cooling separately, correspondingly the elements sulfur and carbon which remain in lime raw materials can be volatilized out more thoroughly, and the recombination of the elements with calcium oxide is avoided, so that the purity of the active lime is improved, and the activity degree of quicklime is further improved.

The invention discloses a method for preparing a mullite nano-whisker by using pyrite tailing as a raw material, and belongs to the field of nano-whisker preparation and mineral resource recycling. The method comprises the following steps: preparing the raw material, pickling for removing iron, calcinating for removing C, S and organic matters, preparing a precursor, and performing calcination and acid soaking for removing a glass phase. According to the invention, the prepared nanoscale mullite whisker has good quality, has excellent properties of both the mullite whisker and the nano-whisker, and has a high additional value and a remarkable economic benefit; in addition, the adopted raw material pyrite tailing is waste mineral materials after mineral dressing, so that the products are low in cost of raw materials, and the secondary recycling of pyrite resources is achieved; meanwhile, compared with other preparation methods, the preparation process of the invention requires lower calcination temperature and shorter calcination time, so that reduction of energy consumption is facilitated, thereby reducing production cost and resource consumption, and increasing economic benefits.

The invention belongs to the technical field of lithium ion battery material preparation, and particularly relates to a method for preparing a proportion-adjustable nickel-rich positive electrode material of a lithium ion battery. According to the scheme of the invention, a chemical formula of the positive electrode material is xLiNi1/3Co1/3Mn1/3O2.yLiNiO2.zAl2O3, wherein x is greater than or equal to 0.2 and less than or equal to 0.5, y is greater than or equal to 0.5 and less than or equal to 0.8, z is greater than or equal to 0 and less than or equal to 0.1, and the sum of x and y is equalto 1. The preparation steps are as follows: controlling the feed speed ratio according to the value of x:y, implementing multi-layered stacking on LiNi1/3Co1/3Mn1/3O2 and LiNiO2 by alternate precipitation, synthesizing a nickel-rich positive electrode material precursor with multiple composite structures, and then performing mixed calcination with an aluminum salt gel to achieve that the outer layer is coated with Al2O3, and finally adopting an ozone-oxygen mixed atmosphere calcination mode to further shorten the calcination time of the material and improve the calcination efficiency. The nickel-rich positive electrode material prepared by the method has high tap density and excellent electrochemical performance.