子分类：
| 序号 | 专利名 | 申请号 | 申请日 | 公开（公告）号 | 公开（公告）日 | 发明人 |
|---|---|---|---|---|---|---|
| 261 | Recovery of AlF3 from spent potliner | US09201197 | 1998-11-30 | US06187275B1 | 2001-02-13 | Robert J. Barnett; Michael B. Mezner |
| A method of recovering AlF3 from spent potliner using an acid digest to form gaseous HF which is converted to hydrofluoric acid and reacted with alumina trihydrate to form AlF3. | ||||||
| 262 | Sludge handling and feeding system | US08772621 | 1996-12-23 | US06176187B1 | 2001-01-23 | R. Leon Leonard; Earl F. Bouse, Jr.; Anne T. McQueen; Harley O. Biggs, Jr. |
| A system for handling aqueous sludge to a combustor such that pollutant emissions associated with combustion operations, e.g., cement manufacturing, are reduced. Sludge is accumulated at a receiving site from where it is transported to a sludge conduit. The sludge is then introduced from the sludge conduit into a combustion apparatus at a point effective to reduce pollutant emissions produced by the combustion operation. | ||||||
| 263 | Method of treating spent potliner material from aluminum reduction cells | US977435 | 1997-11-24 | US5955042A | 1999-09-21 | Robert J. Barnett; Michael B. Mezner |
| A process for treating spent potliner material from aluminum reduction cells and recovering useful products. In the process, spent potliner material is introduced into an acid digester containing, for example, sulfuric acid. A gas component is produced which includes hydrogen fluoride and hydrogen cyanide. A slurry component is produced which includes carbon, silica, alumina, sodium compounds such as sodium sulfate, aluminum compounds such as aluminum sulfate, iron compounds such as iron sulfate, magnesium and calcium compounds such as magnesium and calcium sulfate. The slurry component remains in the digester after the gas component is removed. The gas component is recovered and heated an effective amount to convert or decompose the hydrogen cyanide to a remaining gas component including CO.sub.2, H.sub.2 O, and nitrogen oxides, as well as HF gas. The remaining gas component is directed through a water scrubber in which the HF gas is converted to liquid hydrofluoric acid. The hydrofluoric acid is then admixed with alumina trihydrate to form aluminum fluoride and water. Valuable refractory materials and salts are recovered also. | ||||||
| 264 | Process of preparing a solution of cesium and rubidium salts | US649712 | 1996-09-18 | US5900221A | 1999-05-04 | Hartmut Hofmann; Klaus Kobele; Horst Prinz; Klaus Schade |
| The process for preparing a cesium and rubidium salt-containing solution includes a hydrothermal digestion of an uncalcined pollucite and/or calcined lepidolite particulate having an average particle size up to 0.5 mm with an aqueous solution of Ca(OH).sub.2 in a suspension with a mole ratio of SiO.sub.2 to CaO of from 1:2.5 to 1:1.25 in a rotary tubular autoclave at a digestion temperature of 200 to 280.degree. C., under a pressure of from 15 to 65 bar and at a suspension density between 8 and 18% by weight for from 0.5 to 3 hours; filtering the suspension to remove insoluble solids and to form a digestion filtrate; adding at least one acid or acid anhydride to the digestion filtrate to adjust its pH to 6 and to form the cesium and rubidium salt-containing solution; and performing an evaporation after the hydrothermal digestion to obtain an increase in concentration of cesium salts and rubidium salts in the cesium and rubidium salt-containing solution and to adjust a density of the cesium and rubidium salt-containing solution to from 1.6 to 3.3 g/cm.sup.3. An optional aeration of the digestion filtrate with carbon dioxide to remove lithium and calcium ions in precipitated carbonates may be performed. | ||||||
| 265 | Use of stabilized EAFD as a raw material in the production of a portland cement clinker | US869286 | 1997-06-02 | US5853474A | 1998-12-29 | Robert G. Hilton |
| A method for producing portland cement includes adding stabilized electric arc furnace dust (EAFD) to the raw materials fed into the feed end of a rotary cement kiln to form a cement clinker. The untreated EAFD is preferably stabilized by forming a mixture of water, lime, and a cementitious reactant consisting of untreated electric arc furnace dust. Preferably, dolomitic lime is used and ferrous sulfate is added to the mixture. The stabilized EAFD, which is so soft that no grinding is necessary, may be nonetheless passed through the grinding mill along with the cement raw materials (excluding stabilized EAFD), combined with the raw materials after the raw materials are ground, or delivered directly to the rotary cement kiln in a stream separate from the cement raw materials. The stabilized EAFD serves as an inexpensive iron source in place of iron ore, mill scale, coal ash, or others. Preferably, the stabilized EAFD is added to the cement raw materials in an amount to provide an iron content of between 2%-5%, measured as iron oxide. | ||||||
| 266 | Method and system for controlling pollutant emissions in combustion operations | US213718 | 1994-03-16 | US5586510A | 1996-12-24 | R. Leon Leonard; Earl F. Bouse; Anne T. McQueen |
| The present invention relates to methods and systems for reducing pollutant emissions associated with combustion operations, e.g., cement manufacturing. The invention further relates to the disposal of sludge, e.g., produced by waste water treatment plants, by introducing it into the combustion process. In particular, the invention provides for introducing particles of aqueous sludge into a kiln at a point in the kiln effective to reduce pollutant emissions in outlet flue gasses produced by the kiln. Optimally, the sludge is introduced at a point in which maximum NO.sub.x emission reductions can occur and maximum HCl emission reductions can occur downstream (at lower temperatures). In a specific embodiment, introduction of about 10 to about 20 tons per hour of wet sludge results in about a 15% to 30% reduction in NO.sub.x emissions in a cement kiln. | ||||||
| 267 | Method for treating sludges | US134436 | 1993-10-12 | US5490907A | 1996-02-13 | Peter Weinwurm; Paul S. Weinwurm |
| A method for the separation and recovery of volatiles from a sludge containing about 1 to 80% by weight liquid solvents and 20 to 99% by weight solids, in which said sludge is fed with a reagent powder material in an amount effective to form a mixture having a high surface area to a distillation vessel, said mixture is heated to a temperature up to about 350.degree. C. while said mixture is advanced through the vessel for a time sufficient to distil a sufficient portion of the solvents to yield a solid residue powder, distilled solvents are condensed, and the solid residue powder recovered. The vessel preferably is a mechanical fluidized bed distillation vessel and said mixture is fluidized while being heated therein under a partial vacuum in a non-oxidizing atmosphere. The effective amount of reagent powder material includes about 5 to 70 wt % of the reagent powder material. | ||||||
| 268 | Waste incineration process | US679505 | 1991-04-01 | US5177305A | 1993-01-05 | Philippe Pichat |
| The process is the type wherein the solid portions of waste materials of all origins are crushed and ground to a granulometry of under 5 mm and then are heated to between 750.degree. C. and 1,350.degree. C. According to the invention, after the addition, if applicable, of liquid waste to obtain a pasty mass, a reagent is added to the latter, in pulverulent form having granules of under 500 microns based with calcium carbonate, silicium oxide and, possibly, aluminum and iron oxides in quantities to produce the following ratio after incineration: ##EQU1## Application to the treatment of all types of waste by combustion. | ||||||
| 269 | Method for production of portland clinker | US460343 | 1990-05-14 | US5043020A | 1991-08-27 | Pavel P. Lerke; Stanislav V. Terekhovich; Bakhyt D. Aldiyarov; Valery V. Shnaider; Pavel B. Kurnikov |
| A method for producing portland clinker which includes the steps of calcining a mixture of raw materials, at 1,350.degree.-1.450.degree. C. in a reducing gaseous medium containing more than 80 mass % of carbon monoxide, said mixture containing 59.7-65.05 mass % of limestone, 32.83-39.07 mass % of phosphoric slag and 1.07-6.21 mass % of additional materials containing not less than 40 mass % of iron oxide. The calcined product is then subjected to forced cooling. | ||||||
| 270 | Process for the disposal of combustible refuses | US715437 | 1985-03-25 | US4678514A | 1987-07-07 | Henning Deyhle; Alexander Grisar |
| The invention relates to a process for the disposal of combustible refuses in the manufacture of cement clinker by preheating and partly calcining the cement raw meal in a preheater, burning in a rotary kiln and subsequently air cooling the clinker, the refuse being separately burned and the flue gas obtained thereby transfers its heat to the cement raw meal. In the process according to the invention, hot exhaust air of the clinker cooler is fed to the refuse incineration and flue gas having a temperature of from 1000.degree. to 1400.degree. C. is produced during said incineration by means of which the cement raw meal is calcined. The slag of the refuse incineration is separately discharged. | ||||||
| 271 | Process for desilication of aluminate liquors in the production of alumina | US583944 | 1984-02-27 | US4518571A | 1985-05-21 | Nikolai A. Kaluzhsky; Viktor M. Sizyakov; Vladimir V. Andreev; Alexei I. Alexeev; Khoren A. Badaliants; Isaak A. Zatulovsky; Valentin I. Korneev; Ivan M. Kostin |
| The process consists of two desilication stages. In the first stage the aluminate liquor resulting from digestion of the sinter is subjected to an autoclave treatment to remove the major portion of impurities of SiO.sub.2 and Fe.sub.2 O.sub.3. In the second stage the aluminate liquor is treated with a desilication agent comprising a lime pulp containing oxides CaO, Al.sub.2 O.sub.3, SiO.sub.2, Fe.sub.2 O.sub.3, Na.sub.2 O in a mass ratio of CaO:(SiO.sub.2 +Fe.sub.2 O.sub.3)=1,000 to 5,000:1 and Na.sub.2 Al.sub.2 O.sub.3 =0.25-0.60:1, wherein CaO is active, Na.sub.2 O--in the carbonate form. This lime pulp is employed in such an amount as to ensure the content of active CaO in the aluminate liquor within the range of from 5 to 10 g/l . The impurities of SiO.sub.2 and Fe.sub.2 O.sub.3 present in the liquor pass into the solid phase with the formation of calcium hydrogarnets of the formula 3 CaO(Al,Fe).sub.2 O.sub.3 mSiO.sub.2 (6-2m)H.sub.2 O, wherein m=0.01-0.5 which are separated as a mud. | ||||||
| 272 | Process of hydrometallurgical treatment for eliminating impurities from a solution containing dissolved metals | US87761 | 1979-10-24 | US4276269A | 1981-06-30 | Serge R. de Lockerente; Jacques De Laever |
| In a hydrometallurgical treatment for eliminating one or more metal impurities from a solution containing a metal to be extracted and said metal impurities, a silicate is added to the solution forming in situ dissolved silicic acid and precipitating the metal impurities at a pH of between 1.5 and 4.5 to form a solid silicate residue. | ||||||
| 273 | Cement production from coal conversion residues | US41271 | 1979-05-18 | US4260421A | 1981-04-07 | Leo D. Brown; James M. Eakman; Nicholas C. Nahas; LeRoy R. Clavenna |
| Cement is produced by feeding residue solids containing carbonaceous material and ash constituents obtained from converting a carbonaceous feed material into liquids and/or gases into a cement-making zone and burning the carbon in the residue solids to supply at least a portion of the energy required to convert the solids into cement. | ||||||
| 274 | Production of homogeneous mixtures of dry material | US724616 | 1976-09-20 | US4087922A | 1978-05-09 | Jakob Hinterkeuser; Rolf Jehmlich |
| The invention relates to a method and apparatus for the production of commercially utilizable, homogeneous raw meal-like mixtures from fine grained, moist materials, particularly from sludges, slimes, slurries, etc., and additives. | ||||||
| 275 | Mixture for pavement bases and the like | US654211 | 1976-02-02 | US4018617A | 1977-04-19 | J. Patrick Nicholson |
| A mixture consisting essentially of fly ash, cement kiln dust and aggregate which through pozzolanic reactions produces a hard, strong, durable mass capable of supporting surfacing. | ||||||
| 276 | Production of alumina and portland cement from clay and limestone | US3642437D | 1968-09-09 | US3642437A | 1972-02-15 | ANGSTADT RICHARD L; BELL RUSSELL N |
| Alumina is extracted from kaolin-type clays by admixing the clay with calcium oxide in an amount sufficient to obtain the mole ratios of CaO:Al2O3 within the range of from about 0.8/1 to about 1.2/1, and of CaO:SiO2 from about 1.8/1 to about 2.2/1; calcining the mixture at about 1,300* C.; digesting the clinker with sodium carbonate; following the removing of the solid residue from the digestion solution, aluminum trihydrate is precipitated in the crystalline form of Gibbsite by treatment of the solution with carbon dioxide at elevated temperatures; and the precipitate is calcined to recover the desired alumina. The residue from the digestion step is used to form low-aluminate-containing portland cement.
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| 277 | Manufacture of cement and alkali metal aluminate | US25057339 | 1939-01-12 | US2242258A | 1941-05-20 | WALTER NOLL |
| 278 | Manufacture of hydraulic cement and the like | US74261824 | 1924-10-09 | US1627170A | 1927-05-03 | OSCAR GERLACH |
| 279 | Recovery of potash. | US4751615 | 1915-08-26 | US1236903A | 1917-08-14 | BREYER FRANK G |
| 280 | Process of manufacturing cement. | US1909480672 | 1909-03-01 | US954658A | 1910-04-12 | TORNYAY-SCHOSBERGER RUDOLF |
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