162results about How to "Short firing time" patented technology

The invention discloses a lithium-titanium oxide type lithium ion sieve absorbent and a method for preparing a precursor thereof, and relates to a method for preparing an inorganic absorbent for absorbing enriched lithium from salt lake brine, seawater and other liquid lithium resources. The method is characterized in that: titanium dioxide and lithium salt are taken as raw materials, ground by a ball grinder and dried so as to prepare a precursor Li2TiO3 of an ion sieve through a high-temperature solid-phase roasting method; and the lithium is eluted from the precursor Li2TiO3 by inorganic acid to prepare an ion sieve H2TiO3. The method has the advantage of simple technology, and the obtained ion sieve has the advantages of low solution loss and high adsorption capacity.

The invention relates to an Al4SiC4 material synthetic method. An employed technical scheme comprises the following steps by weight percentage: taking 45-65% of Al powder, 20-35% of SiC powder, 15-30% of powdered carbon and uniformly mixing with absolute alcohol while planetary ball milling, drying under the temperature of 80-120 DEG C, shaping, then imbedding a sample in a graphite crucible equipped with metal aluminum powder, placing the graphite crucible in a furnace, under the imbed carbon condition, heating and insulating for 2-7 hours under the temperature of 1500-1700 DEG C, cooling and removing the sample from the graphite crucible and then removing an impurity layer on the surface to obtain the Al4SiC4 material. According to the invention, the material can be synthesized without protection atmosphere of vacuum or inert gas and the like, the technology is simple, the synthesis temperature is low, the obtained product possesses high yield and purity, and is adapted to large scale production. The product can be used for ceramic matrix components, and can be used as an additive to be introduced to a carbonaceous refractory material for increasing its antioxidation performance.

The invention relates to the technical field of metallurgy, in particular to a pretreatment method for refractory gold ore with antimony and arsenic. The method comprises the steps that 1, the refractory gold ore with antimony and arsenic is broke and subjected to ball milling to form powder; 2, the powder obtained in the step 1 is added into a hermetic vertical pipe type heating furnace, neutral protective gas is introduced in, roasted ore is obtained after roasting and cooling are carried out, produced tail gas enters a tail gas collection device, collected smoke dust is leached through a mixed solution of Na2S with the concentration of 50-200 g/L and NaOH with the concentration of 20-100 g/L, solid-liquid separation is carried out, a filter residue with arsenic and a leaching solution with antimony are obtained, and the leaching solution is electrodeposited to produce metal antimony, wherein leaching time is 30-180 min, and leaching temperature is 20-95 DEG C. The pretreatment method has the advantages that the technological process is simple, operation is flexible, roasting time is short, energy consumption is low, antimony and arsenic can be synchronously removed, smoke gas is low in toxicity and small in amount, and economic and social benefits are good.

The invention relates to a sludge treatment apparatus for a water conservancy project. The sludge treatment apparatus comprises a transport apparatus, a stirring chamber, a transport pipeline part, a sludge filter chamber, a sludge mixing and drying part, a mixing and granulating chamber and a ceramsite heating chamber. By arranging various parts, the sludge treatment, the ceramsite preparation from sludge and the ceramsite forming can be continuously carried out, so that not only can the sludge containing heavy metal be removed and the secondary pollution of the sludge to a water body be avoided, but also heavy metal elements are secondarily utilized for the ceramsite, and the harmful sludge can be actually turned into benefit.

A Raney nickel catalyst used for low-pressure hydrogenation of dinitrotoluenem. The catalyst is characterized by comprising, by mass, 80-90 wt% of nickel, 5-10 wt% of aluminium and 1.65-10 wt% of an auxiliary agent metal, wherein the nickel is in the form of a simple substance, the aluminium is in the form of the simple substance of an oxide and the auxiliary agent metal is in the form of the oxide. The catalyst is low in price and has an excellent performance of catalytic hydrogenation of the dinitrotoluenem (DNT) without an additional solvent and under a low-pressure condition of 1Mpa.

The invention discloses ultralight fully-closed-cell foamed ceramic with a compact surface. According to the invention, quartz sand is taken as a main material, calcium carbonate is taken as a foaming agent, borax is taken as a fluxing agent and zinc oxide, albite, potassium feldspar and spodumene are taken as conditioning agents; and a sintering temperature is 740 to 800 DEG C. The invention further discloses a low-temperature firing method of the ultralight fully-closed-cell foamed ceramic. The preparation technology disclosed by the invention has the remarkable advantages of simple process, low sintering temperature, short sintering time and the like, so the manufacturing cost of the method is far lower than the manufacturing cost of existing preparation technology. Besides, different from foamed ceramic prepared in the prior art, the interior of the ultralight fully-closed-cell foamed ceramic with the compact surface is of a porous structure, pores are independent from one another and do not communicate with each other, the surface is continuous and compact and free of pores, the heat preservation and sound insulation effects of the foamed ceramic can be remarkably improved, the foamed ceramic has excellent waterproof and moisture-proof performance, and the reliability of a product is obviously improved.

The invention relates to a composite roasting additive used in the roasting process of vanadium-containing stone coal and application of composite roasting additive. The composite roasting additive comprises the following components in percentage by mass: 35 to 45 percent of sodium fluoaluminate, 40 to 50 percent of calcium fluoride, and 15 to 25 percent of hyperoxide of alkali metal, wherein the hyperoxide of the alkali metal is sodium hyperoxide or potassium hyperoxide or calcium hyperoxide. When the composite roasting additive is used, the adding amount of the composite roasting additive for extracting vanadium pentoxide from the vanadium-containing stone coal is 1 to 6 percent of the mass of the vanadium-containing stone coal, the composite roasting additive and the vanadium-containing stone coal are fully mixed uniformly, the roasting temperature is 700 to 900 DEG C, and the roasting time is 1 to 4 hours. Compared with the prior art, the composite roasting additive has the advantages of (1) low adding amount, (2) low roasting temperature and short roasting time, (3) no smoke pollution, (4) high leaching rate, (5) wide additive component source, and (6) good adaptability.

The invention relates to a production method for quickly firing aventurine glaze for stoneware, comprising the following raw materials: clinker 1#, clinker 2#, potassium feldspar powder, talcum powder, quartz, Guizhou soil, spodumene and calcined iron oxide red, wherein the formula of clinker 1# includes borax, quartz, soda ash and potassium feldspar, and the formula of clinker 2# includes borax,glass, quartz, potassium feldspar, calcite and potassium nitrate; wet ball milling is adopted; the proportion of selected material to ball to water is 1 : 2 : 0.46; the smashed material of the clinkers and the rest materials are put into a ball mill to be subjected to ball milling until reaching 250 meshes, and the rest material is less than 0.3 percent, and then a slurry with the concentration of 45 baume degree is prepared; a glaze dipping manner is adopted to glaze a stoneware green body, the thickness of the glaze layer is controlled to be 0.6-0.8mm, and then the aventurine glaze is produced by sintering in a fast tunnel furnace at the temperature of 1180-1196 DEG C. The aventurine glaze is simple to produce, can be quickly sintered in the tunnel furnace, and has short sintering time and bright glazing color, and the aventurine glaze surface is bright and flickers under the irradiation of light, thus giving people a luxury and elegant impression.

The invention discloses a method for preparing ceramsite by using Xianfeng diatomite. The method comprises steps of: crushing a naturally dried raw material Xianfeng diatomite; mixing the raw material with water in a ratio of 100:60-70 and stirring uniformly; air-drying the mixture to a water content of 40-50%; moulding; air-drying naturally; and finally sintering to obtain high strength diatomite ceramsite. The method of the invention is simply operated, has good effect; and the ceramsite prepared by the method has good strength, reduced water absorption, strong durability and wide application scope.

The invention relates to a novel tunnel-type folded-rail continuous sintering furnace and a sintering method thereof. The novel tunnel-type folded-rail continuous sintering furnace comprises a furnace body, wherein one end of the furnace is open while the other end of the furnace is closed; an upper layer of roll-type or push-plate-type conveying devices (3) and a lower layer of roll-type or push-plate-type conveying devices (2) which are folded and move in opposite directs are arranged in the inner cavity of the furnace; a slag falling-preventing baffle plate (6) and a carrying mechanism (10) capable of doing an up-and-down reciprocating movement are arranged between the two layers; and a heating device (9) and a fuel gas curtain separating nozzle (8) are arranged in the inner cavity of the lower layer of the furnace. By virtue of a super-fast single-sided heating sintering mechanism, and by the adoption of a pair of opposite conveying devices with an extremely high heat exchanging rate and an extremely high afterheat utilizing rate, the temperature difference between the upper layer and the lower layer can remain about 150-300 DEG C at the same section, thus achieving the most economical ceramic continuous sintering state; therefore, the novel tunnel-type folded-rail continuous sintering furnace is a novel continuous sintering furnace with a super-high sintering speed, an extremely high heat exchanging rate and a super-short length.

The invention relates to a roasting method for extracting vanadium from vanadium-containing shale. According to the technical scheme of the invention, the method comprises the following steps of: uniformly mixing vanadium-containing shale raw ore with a vanadium-containing shale extraction roasting additive in a ratio of 1:(0.06 to 0.1), feeding the mixture to a roasting furnace, heating to 850 to 1000 DEG C at a temperature rise rate of 400 to 500 DEG C/h, maintaining the temperature for 1 to 2 hours, then adding the roasted product to dilute sulfuric acid with volume fraction of 4 to 10% in a solid-liquid mass ratio of 1:2, and leaching at 90 to 100 DEG C for 0.5 to 1 hour under the condition of stirring. The preparation method of the vanadium-containing shale extraction roasting additive comprises the steps of: preparing Mg compounds, namely NaClO3, Na2CO3 and CaCO3 and mixing uniformly, wherein the mass ratio of NaClO3:Na2CO3:CaCO3 is 1:1:(4 to 8):(6 to 10); and grinding until the particle size is not more than 0.15 mm. The method provided by the invention increases the leaching rate up to 86% to 87% and has the characteristics of high recovery rate, short roasting period, high leaching speed and little roasting pollution.

The invention discloses a process for separating iron and aluminium from high aluminium brown iron ore, wherein brown iron ore is broken to the granularity of less than 1.0mm, and is actived and braked for 10-20 minutes at the temperature of 400-500 DEG C, then placed in the reactor to have a stripping dealuminzation by 100-150 g/l NaOH solution at the temperature of 120-150 DEG C based on the quality liquid-solid rate of 3/1 -6/1, the time of stripping is 20-45 minutes, the filtrate can be causticized and be back to reuse after solid-liquid separation, and the filter cake is reacted with lime solution at the temperature of 100- 140 DEG C for 30-50 minutes and then solid-liquid separation, accordingly Al2O3 content can be reduced to 3.0%, and Na2O content can be less than 0.25% in the iron ore concentrate, while iron ore concentrate grade can be greatly improved. The invention is usable for the iron and aluminium separation of brown iron ore with higher-content aluminium oxide in the form of gibbsite of aluminium mineral with good dealuminzation and low process cost, the content of Al2O3 and Na2O in ore concentrate satisfies the requirement of blast furnace ironmaking materials, provided a powerful technical support for the rational use of existing rich high aluminium brown iron ore.

The invention discloses a method for performing flash reducing and roasting on zinc calcine. The method comprises the following steps: adding the zinc calcine and material conveying gas into a flash roasting furnace in a jet mode; and dropping the zinc calcine in the flash roasting furnace in a suspended state, and roasting. According to the method, the energy consumption is low, zinc ferrite in the zinc calcine can be rapidly and completely decomposed and reduced, and according to the method, economic value is high, and industrialized production can be realized.

The invention discloses a method for preparation of silicon nitride bonded silicon carbide refractory material by using silicon cutting waste mortar, and the method comprises the following steps: (1), preparing raw materials, wherein the raw materials including, by weight, 5%-20% of the silicon cutting waste mortar, 50%-80% of silicon carbide, 2%-20% of silicon nitride and 1%-10% of alumina; (2), adding the raw materials into absolute ethanol for wet ball milling; (3), drying the raw materials treated by the wet ball milling; (4), adding PVA (polyvinyl acetate) to the dried raw materials for granulation to prepare blank, wherein the mass of the added PVA being 3%-8% of the mass of the raw materials; and (5), sintering the blank in air atmosphere into the silicon nitride bonded silicon carbide refractory material. The method can realize full utilization of the silicon cutting waste mortar, has no secondary pollution, also does not need the protection of nitrogen, and only needs an electric furnace for heating in the air atmosphere to prepare the low-volume-density and high-flexure-strength silicon nitride bonded silicon carbide refractory material, and can reduce environment pressure, turn waste into treasure, reduce the production cost and realize industrialized production.

The invention discloses a method for preparing corundum abrasive by microwave sintering, and belongs to the technical field of abrasive preparation. The corundum abrasive comprises the following raw materials in percentage by weight: 95-98% of Al2O3, 0.5-2.5% of SiO2, 0.5-1% of MgO, 0.2-1% of TiO2, 0.2-1% of MnO2, and 0.1-1% of CuO. The method comprises the following steps: mixing the raw materials; molding; crushing; sieving; grading; performing rubber removing; transferring the rubber-removed blank particles into an SiC crucible; increasing the temperature to reach 1300-1500 DEG C at the rate of 10-20 DEG C per minute; then maintaining the temperature for 5-30min, and performing microwave sintering to obtain the corundum abrasive. With the adoption of the method, energy consumption of the corundum abrasive production can be greatly decreased; in addition, the blank particles are in contact with each other, so that the clearances among the particles are small, the temperature gradient of a sintered body can be reduced, the sintering time is greatly decreased, and as a result, the corundum abrasive sintering quality can be improved.

Provided is a method of manufacturing an object with a low reflection film, with which it is possible to form a low reflection film with which it is possible to handle a wide substrate, have a comparatively rapid speed of conveyance of the substrate, a comparatively low volume of required coating compound, a comparatively short time for drying, firing, and/or application, and a uniform thickness, as well as have superior thickness controllability whereby a low reflection film having thickness which is arbitrarily optically designable is easily formed. When forming, upon a substrate (2) which is conveyed in a prescribed direction, a low reflection film by applying a coating compound (20) by a coating roll (14) of a reverse roll coater (10), the rotation speed of the coating roll (14) is made slower than the conveyance speed of the substrate (2), and the coating compound (20) includes a dispersal medium (a), fine particles (b) which are dispersed in the dispersal medium (a), and a binder (c) which is either dissolved or dispersed in the dispersal medium (a), wherein the viscosity is 1-10mPa.s.

The invention discloses a low-temperature semiwhite porcelain and a manufacturing method thereof, belonging to the technical field of ceramics. The blank of the low-temperature semiwhite porcelain comprises the following raw materials in parts by mass: 30-40 parts of Longyan clay, 25-35 parts of Gangxi kaolin raw ore, 20-28 parts of flint, 7-12 parts of feldspar, 2-9 parts of talcum and 5-10 parts of dolomite. The low-temperature semiwhite porcelain can be quickly fired at the low temperature of 1000 DEG C, and can be discharged out of the kiln only by 7-8 hours from firing to cooling. The linear shrinkage is low and can be kept at 12% or below. The low-temperature semiwhite porcelain has high hardness and excellent whiteness (85% or above), and has comparable whiteness with light-weight porcelain. The low-temperature semiwhite porcelain has low water absorptivity (which can be kept at 3% or below and can reach the porcelain industry standard), has the advantages of high strength excellent high temperature resistance and excellent microwave resistance, can be subjected to 180-DEG C drying oven testing more than twice, and can pass the microwave oven and dishwasher performance test. The low-temperature semiwhite porcelain has wide applicability, and can be widely used for producing medium/high-grade domestic ceramics.