• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    An alkaline high temperature process for the production of alkali containing highly citrate soluble calcined phosphate fertilizer is disclosed. The process comprises calcining a preheated mixture comprising a crude phosphate, an alkaline decomposing agent, silicic acid and phosphoric acid in a rotary kiln at a temperature of between about 900 DEG and 1300 DEG C. The preheated mixture is prepared by introducing phosphoric acid directly into the kiln and therein contacting it with the hot precursory mixture of the remaining starting material having a temperature of between about 150 DEG to 900 DEG C. The amounts of starting materials are preferably chosen such that in the mixture 1 mole of P2O5 is present per about 1.1 to 1.8 moles of alkali oxide, and about 0.5 moles of SiO2 are present per mole of CaO which is in excess of the amount of CaO which can be bound in the form of calcium alkali phosphate.
    公开号:SU833155A3
    申请号:SU782584548
    申请日:1978-02-27
    公开日:1981-05-23
    发明作者:Хаушильд Ульрих；Касперс Ханс-Хайнц；Ретгер Хайнрих
    申请人:Кали-Хеми (Фирма)；
    IPC主号:
    专利说明:

    This invention relates to methods for producing calcined alkali metal phosphates used as fertilizers with a high content of nutrients. A method of producing alkali metal thermophosphates is known by calcining a granulated mixture of natural phosphate, an alkali metal hydroxide, and silky acid retour. In this way, thermophosphates with a low content (20–30%) of Dj are obtained. There is also known a method for producing alkali metal thermophosphates, which consists of heating a mixture containing natural phosphate, hydroxide or alkali metal carbonate, cream, zinc and phosphoric acid at a ratio of about 1.0: (1.1 and 1.8) G23. However, when such a mixture is introduced into the furnace, nastiles form on the walls and in the whole mass of the mixture lumps form. This leads to the need to periodically stop the furnace. This also creates conditions for obtaining a product of repeated composition. The purpose of the invention is to prevent the formation of dust in a furnace. The goal is achieved by the method of papucation of alkali metal thermophosphates, consisting in heating a mixture containing phosphate, carbonate and / or alkali metal hydroxide, phosphoric and silicic acids in a rotary kiln at 1100-1300С and the ratio Me, 0 1 , 0: (1.1-1.8), and the phosphoric acid is introduced into the furnace in a sprayed form for heating up to 150-9POS charge. Alkali metal hydroxide can also be introduced as a solution directly into the furnace. As the lower limit of the temperature range, a temperature of about 150 ° C is optimal. At a lower temperature, the formation of lumps in the mixture is observed, due to which uniform calcination is not carried out. At the same time, phosphoric acid is mixed with the raw material before they reach the sintering zone, therefore, the acid is fed into the zone at a mixture temperature not higher. This leads to the complete homogenization of the mixture in the sintering zone. Example 1. A mixture of 1000 weight. H. West African raw phosphorus (36.0%, 51.0% CaO and 4.5% SI02) i
    427 weight.h. soda (100%), 59 weight.h. sand (Si0) and return dust from the exhaust furnace gases are continuously fed. into a technical rotary kiln. A rotary kiln, heated directly by a burner for liquid fuel, operates according to the counter-current principle, i.e. the mixture to be calcined is advanced towards hot gases. 80 kg of technical phosphoric acid with a content of 50.0 wt.% In a well-crushed form to obtain a mixture is supplied continuously to 100 kg of crude phosphoresa at product temperatures. There are no sails on the walls. With the passage of the heel zone (t i22Q ° C) there is no build-up. A product with a content of 31.4% is obtained. The solubility of PdO is 98.8% in Petermann solution and 99.6% in 2% citric acid solution. The constant 20 solubility in the samples is evidence of the preferred amount of phosphoric acid added.
    Comparative example. To a mixture of 1000 parts by weight West Africa, 25 Kan crude phosphate (36.0%, 51.0% CaO and 4.5% S i Oh-a.), 427 parts by weight (100% ,,), 59 weight.h. sand (S i 0,) and return dust of flue furnace gases before feeding into the furnace in the mixing device (screw mixer) continuously for 1000 kg of crude phosphate are served 80 kg of technical crude phosphoric acid with a content of 50.0 Beq.% . This forms, with sodium orthophosphate hydrate. The mixture is continuously fed to a rotary kiln heated by a burner for liquid fuel, countercurrent to hot gases, with the temperature in the kiln about 1220С. In the furnace very soon nastily formed on the walls of the furnace, which lead to stopping of the furnace. The resulting product contains 31.4% of P, the stability of which in a Petermann solution is 8598% ..45
    Example 2. A rotary kiln heated by a burner for liquid fuel, as in Example 1, is fed continuously to 1000 parts by weight. Cola apatite (39.1% P-iOg-, 51.7% CaO and 1.6% 510), JQ as well as dust collected in a conventional separation unit from the waste basins. On the combustion side, simultaneously to a moving countercurrent material in the product temperature range of 600 -; B50C is continuously supplied with an aqueous solution of potassium hydroxide with a KOH content of 49.1% by weight and technical crude phosphoric acid with a content of 54.7%. Apatite and KOH are introduced in a weight ratio of 1: 1.168, apatite and phosphoric acid in a ratio of 1: 0.482.
    After calcining 1140C, calcined potassium phosphate is discharged with a content of 37.1% P.Cg and 27.2% K, 20. Solubility .0 F is in plant
    Peterman's thief 99.8%, in a 2% citric acid solution - 99.8%. Of all K, -cO, only a small part was soluble in water.
    Since not only an aqueous solution of potassium hydroxide, which serves as a cooking solution, but also aqueous phosphoric acid, is added directly to the rotary kiln, non-varying well-calcined phosphate products are obtained.
    Compared to e-gim, when technical phosphoric acid is mixed with BcUOT to the dry product before being introduced into the kiln, it is immediately formed and dried.
    Example 3. Analogously to example 1, 1000 weight.h. Florida - Pebll phosphate (31.4%, 47.6% CaO and 9.0% ZGOh), 171 parts by weight an aqueous 49.8% solution of sodium hydroxide, as well as returning dust, is fed to the screw mixer by passing furnace waste gases, with a partial carbonation and concentration of the hydroxide. Lumpy mass is continuously fed to the rotary kiln. On the supply side, countercurrent to furnace gases is continuously fed to material heated to 150–450 ° C (technical crude phosphoric acid with a content of 50.0 wt.% In an amount of 151 kg per 1000 kg of raw phosphate) is well mixed. At the same time, from the burning side, 1000 kg of an aqueous solution of sodium hydroxide with a content of 49.8 Bec. which enters the heated to 700-850 0 product.
    At the same time, products capable of being finely ground are obtained, which have a P. jO5 content of 31.3% solubility in Petermann solution of 98.9% and solubility in solution of citric acid.
    Example4. 30 weight.h. raw phosphate from North Africa with a content of 32.1% Pa05, 50.0% CaO and 2.2% Si i, along with soda and sand in a ratio of 1000: 541 is continuously fed with returning dust from exhaust furnace gases into a rotary kiln . At a mixture temperature of 400-600 C, technical phosphoric acid is supplied in an amount of 345 wt. 4. per 1000 weight parts crude phosphate. In this case, there are no difficulties during the further operation of the furnace. Get the product, the calcined to the maximum, with a total content of 34.7 solubility in solution Nethermann 98.8%) solubility in citric acid 99, 6%.
    权利要求:
    Claims (2)
    [1]
    1 .. A method of producing alkali metal thermophosphates by heating a mixture.
    containing phosphate, carbonate and / or alkali metal hydroxide, phosphoric and silicic acids, in a rotary kiln at 900-113 ° C and as appropriate,. : - 1.1: (1.1-1.8), characterized in that, in order to prevent formation of phosphoric acid, phosphoric acid is introduced into the furnace in a spray form at the heated to 150 bOO from the charge.
    [2]
    2. A method according to claim 1, characterized in that the alkali metal hydroxide is introduced directly into the rotary kiln.
    Sources of information taken into account in the examination 1. The patent of Germany I 1592685,
    cl. 12 I 25/30, 03/03/73. .
    2. German patent 729909, cl. 12 I 13/02, C 05 B 13 / 02.03.12.42
    类似技术:
    公开号 | 公开日 | 专利标题
    US2442969A|1948-06-08|Manufacture of defluorinated tricalcium phosphate
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    US2093176A|1937-09-14|Treatment of raw phosphates
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    EP0826630B1|2001-12-05|Method of producing synthethic silicates and use thereof in glass production
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    US1880491A|1932-10-04|Producing calcined phosphates
    US3107145A|1963-10-15|Process for defluorinating phosphatic materials
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    PL94344B1|1977-07-30|
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    US3713803A|1973-01-30|Production of phosphate fertilizers
    US3378341A|1968-04-16|Process for the manufacture of polyphosphates of low bulk density
    US1186522A|1916-06-06|Process of obtaining cement and soluble potassium compounds.
    US3985537A|1976-10-12|Process for making calcined alkali phosphates of high citrate solubility for use as fertilizers
    US3473889A|1969-10-21|Method for producing phosphates
    SU441259A1|1974-08-30|The method of obtaining thermophosphates
    US2875032A|1959-02-24|Process of preparing a phosphated product
    US1283677A|1918-11-05|Process of manufacturing fertilizer.
    US1194219A|1916-08-08|And geoeoke b
    US1624195A|1927-04-12|Method of producing phosphate fertilizer
    SU998333A1|1983-02-23|Method for granulating phosphate raw material
    同族专利:
    公开号 | 公开日
    BR7801226A|1978-11-28|
    PL112591B1|1980-10-31|
    DK92578A|1978-09-03|
    IT7819549D0|1978-01-24|
    US4167406A|1979-09-11|
    DE2709016C3|1980-01-10|
    HU176544B|1981-03-28|
    AU3363078A|1979-09-06|
    BE864324A|1978-08-28|
    AR212307A1|1978-06-15|
    ZA78920B|1979-01-31|
    FR2382416A1|1978-09-29|
    JPS53107973A|1978-09-20|
    IN148105B|1980-10-18|
    PL204989A1|1978-12-18|
    IT1093266B|1985-07-19|
    NL7801717A|1978-09-05|
    SE7802310L|1978-09-03|
    IL54082A|1980-09-16|
    DD134865A5|1979-03-28|
    GB1560612A|1980-02-06|
    DE2709016A1|1978-09-07|
    ES466140A1|1978-10-16|
    DE2709016B2|1979-05-03|
    NO780703L|1978-09-05|
    IL54082D0|1978-04-30|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1799882A|1924-03-21|1931-04-07|Firm Of Rhenania Ver Chemische|Process for producing fertilizer|
    DE481177C|1924-03-22|1931-05-23|Kali Chemie Akt Ges|Manufacture of a fertilizer|
    DE681699C|1935-10-09|1939-09-29|Friedrich P Kerschbaum Dr|Process for the production of basic products containing phosphoric acid, especially suitable for fertilization purposes|
    FR805673A|1936-04-21|1936-11-26|Der Chemischen Produkten Fabri|Process for the production of roasted phosphates|
    US2337498A|1939-01-16|1943-12-21|Ritter Friedbert|Production of fertilizers|
    DE721412C|1939-11-02|1942-06-04|Kali Chemie Ag|Process for the production of phosphate fertilizers|
    DE744998C|1940-03-16|1944-02-22|Kali Chemie Ag|Process for the production of sintered phosphate fertilizers|
    DE729909C|1940-08-17|1943-01-05|Kali Chemie Ag|Process for the production of sintered phosphates|
    DE744999C|1940-08-17|1944-02-22|Kali Chemie Ag|Process for the production of sintered phosphates|
    IL27812A|1966-04-21|1970-09-17|Kali Chemie Ag|Production of calcined phosphate fertilizers|
    DE1592690B2|1966-04-21|1976-12-23|Kali-Chemie Ag, 3000 Hannover|PROCESS FOR THE PRODUCTION OF ALKALINE LUE PHOSPHATE DUENANTS|
    FR1541911A|1966-11-09|1968-10-11|Kali Chemie Ag|Process for obtaining calcined phosphates endowed with a fertilizing activity|
    US3802861A|1967-04-04|1974-04-09|Kali Chemie Ag|Production of calcined phospate fertilizers|
    DE1294977B|1967-04-18|1969-05-14|Kali Chemie Ag|Process for the production of gluehphosphate fertilizers|
    FR2026878A1|1968-12-23|1970-09-25|Kali Chemie Ag|Producing ca3 2 ca na po4|
    ES401503A1|1971-06-05|1975-02-16|Kali Chemie Ag|Method of producing a citrate-soluble calcined alkali metal phosphate fertiliser|
    US3985537A|1971-06-05|1976-10-12|Kali-Chemie Aktiengesellschaft|Process for making calcined alkali phosphates of high citrate solubility for use as fertilizers|JPS56501086A|1979-09-07|1981-08-06|
    US4372929A|1981-01-07|1983-02-08|James C. Barber And Associates, Inc.|Energy conservation and pollution abatement at phosphorus furnaces|
    AU571549B2|1983-08-04|1988-04-21|Thomas, G.|Extracting soluble phosphates|
    CA2338822A1|1998-08-17|2000-02-24|The Procter & Gamble Company|Multifunctional detergent materials|
    US8259043B2|2007-06-07|2012-09-04|Honeywell International Inc.|Hybrid driver for light-emitting diode displays|
    DE102014108199B3|2014-06-11|2015-05-13|Bundesrepublik Deutschland, Vertreten Durch Den Bundesminister Für Wirtschaft Und Energie, Dieser Vertreten Durch Den Präsidenten Der Bundesanstalt Für Materialforschung Und -Prüfung |Preparation of citrate-soluble phosphates by calcination of secondary phosphate sources with a sodium-sulfur compound|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2709016A|DE2709016C3|1977-03-02|1977-03-02|Process for the production of an alkaline calcined phosphate fertilizer|
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