• 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:
    The present invention relates to a wet process for the manufacture of phosphoric acid, which process essentially comprises a digestion step in which phosphate rock is digested by means of phosphoric acid and sulfuric acid to form a slurry containing highly concentrated phosphoric acid together with calcium sulfate hemihydrate, and a separation step in which the slurry is filtered for separation of calcium sulfate hemihydrate from the highly concentrated phosphoric acid (in which the concentration of P205 in the product acid is higher than 40% by weight, based on the weight of the product acid) and which is characterized by supplying active silica at a ratio of 0.2-5% by weight, based on the weight of phosphate rock, in order that active silica may be present in the above mentioned digestion step.
    公开号:SU867292A3
    申请号:SU762388516
    申请日:1976-08-12
    公开日:1981-09-23
    发明作者:Иноуе Такасуке；Ито Юзо；Накадзима Старо；Тадзика Син-Ити；Саики Есио
    申请人:Ниссан Кемикал Индастриз, Лтд (Фирма)；
    IPC主号:
    专利说明:

    The invention relates to methods for producing phosphoric acid, which is widely used in the chemical industry. A known method of producing extraction phosphoric acid by decomposing phosphorites of circulating phosphoric and sulfuric acids in the presence of active silica, which is introduced in the form of silicic acid or silicates in the amount of: 3 wt.%. The process is carried out at 105 s, which provides calcium sulfate hemihydrate and 35% phosphoric acid phosphate pentoxide / 1. However, according to the atom method, an excess of soluble silicic acid is added to calcium sulfate dihydrate to convert it to the hemihydrate, i.e. This method refers to the dihydrate methods for the preparation of phosphoric acid or may be used in the preparation of Phosphoric acid calcium sulfate hemihydrate. There is also known a method of obtaining phosphoric acid by decomposing phosphorite with concentrated sulfuric and circulating phosphoric acids with recirculating the pulp of sediment separation by filtration, hydration of calcium sulfate hemihydrate into dihydrate in an aqueous solution of phosphorus and sulfuric acid, and separation of dihydrate by filtration 2. A disadvantage of this method is low productivity of the filtration stage - not more than 2.0 2.5 t Pa.O5- / m day. The purpose of the invention is the higher production and filtration stage. The goal is achieved in that according to the method of obtaining phosphoric acid, which consists in decomposing phosphorite with concentrated sulfuric and circulating phosphoric acids with recycling of the pulp, separating the filter by filtration, hydration of calcium sulfate hemihydrate into the dihydrate in an aqueous solution of phosphoric and sulfuric acid. . hydrate by filtration; in this case, active silicon dioxide in an amount of 0.5-2.0% by weight of phosphate is introduced at the placement stage or at the hydration stage. Active silicon dioxide can be introduced in the form of diatomaceous earth or silica gel. Table 1 gives the dependence of the specific surface area of the sylphate hemihydrate on the amount of silica introduced.
    Table
    The temperature and duration of the stages are given in table 2.
    Table 2
    权利要求:
    Claims (3)
    [1]
    1. A method for producing extraction phosphoric acid by decomposing phosphorite with concentrated sulfuric and reverse phosphoric acids with pulp recirculation, separating the precipitate by filtration, hydrating calcium sulfate hemihydrate into dihydrate in an aqueous solution of phosphoric and sulfuric acids, and separating the dihydrate with a 4Q filtration, o aphids with me; that, in order to increase the productivity of the filtration stage, the decomposition of phosphorite is carried out in the presence of active silica, which is taken in an amount of 0.5-2.0% by weight of phosphorite.
    ^ 5
    [2]
    2. The method according to claim 1, characterized in that the active silica is used in the form of diatomaceous earth or silica gel.
    [3]
    . (3 "The method according to claims 1 and 2, and a m l h w A50 ^ and I th with the fact that active silica is introduced on stage - hydration '.
    类似技术:
    公开号 | 公开日 | 专利标题
    SU867292A3|1981-09-23|Method of producing extractional phosphoric acid
    US2013970A|1935-09-10|Process of producing phosphoric acid and derivatives of the same
    US2531977A|1950-11-28|Process for manufacture of phosphoric acid
    US3418077A|1968-12-24|Phosphoric acid
    US2799557A|1957-07-16|Production of feed grade dicalcium phosphate
    GB1309578A|1973-03-14|Process for purifying phosphoric acid
    GB1205122A|1970-09-16|Process for the production of phosphoric acid
    US2608465A|1952-08-26|Process of producing lithium sulfate from lithium phosphates
    CN108529581A|2018-09-14|The preparation method of feed-grade calcium phosphate salt
    US2193092A|1940-03-12|Recovery of vanadium
    US2384856A|1945-09-18|Manufacture of crude phosphoric acid
    CN104627974B|2016-08-31|A kind of production method of battery-grade iron phosphate
    GB1328357A|1973-08-30|Wet process for the manufacture of phosphoric acid andcaldium sulphate
    SU1223838A3|1986-04-07|Method of producing phosphoric acid
    JPS59137317A|1984-08-07|Manufacture of needlelike alpha-hemihydrate gypsum
    US3984525A|1976-10-05|Manufacture of phosphoric acid
    GB1184585A|1970-03-18|A Method for Manufacturing Pure Gypsum.
    US2384813A|1945-09-18|Manufacture of pure phosphoric acid
    US4113835A|1978-09-12|Process for preparing pure synthetic calcium sulfate semihydrate
    US2976141A|1961-03-21|Process for the recovery of values from phosphate rock
    US2869997A|1959-01-20|Production of concentrated superphosphate fertilizers
    SU551248A1|1977-03-25|The method of producing phosphoric acid
    SU1474082A1|1989-04-23|Method of producing phosphoric acid
    US3489510A|1970-01-13|Treatment of phosphate rock with acidic substances and to the resulting superphosphate products
    SU1399266A1|1988-05-30|Method of producing phosphoric acid
    同族专利:
    公开号 | 公开日
    JPS5851884B2|1983-11-18|
    AU1672476A|1978-02-16|
    AU503183B2|1979-08-23|
    DE2636140A1|1977-02-24|
    IN143813B|1978-02-04|
    TR20187A|1980-11-01|
    NL7609049A|1977-02-15|
    ES450636A1|1977-12-16|
    CA1067675A|1979-12-11|
    ZA764875B|1977-07-27|
    NZ181752A|1978-06-02|
    MX3803E|1981-07-22|
    BE844897A|1976-12-01|
    SE423975B|1982-06-21|
    SE7609051L|1977-02-14|
    FR2320903A1|1977-03-11|
    JPS5221296A|1977-02-17|
    GB1560546A|1980-02-06|
    US4101638A|1978-07-18|
    BR7605283A|1977-08-09|
    IT1066381B|1985-03-04|
    DE2636140C2|1987-04-09|
    FR2320903B1|1981-05-22|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US1969449A|1931-10-17|1934-08-07|Rumford Chemical Works|Process of producing by-product calcium sulphate|
    CA718837A|1962-06-23|1965-09-28|Toyo Engineering Corporation|Wet-process phosphoric acid manufacture by the semihydrate-dihydrate calcium sulphate method|
    US3653826A|1967-09-21|1972-04-04|Nissan Chemical Ind Ltd|Process for the production of phosphoric acid at a high concentration and a gypsum by-product of improved quality|
    GB1248037A|1968-01-13|1971-09-29|Fisons Ltd|Calcium sulphate|
    GB1278247A|1968-11-15|1972-06-21|Fisons Ltd|Phosphoric acid|US4277454A|1979-09-18|1981-07-07|J. R. Simplot Company|Methods for the control of excessive corrosion in phosphoric acid circuits|
    US4367197A|1979-09-18|1983-01-04|J. R. Simplot Company|Method for the control of excessive corrosion in phosphoric acid circuits|
    DE3117813A1|1981-05-06|1982-11-25|Chemische Werke Hüls AG, 4370 Marl|METHOD FOR THE PRODUCTION OF PLASTERING BLOCKS|
    LU84713A1|1983-03-25|1984-11-14|Prayon Soc|PROCESS AND PREPARATION OF PHOSPHORIC ACID AND CALCIUM HEMIHYDRATE ALPHA SULFATE|
    FR2598402B1|1986-05-07|1990-06-01|Rhone Poulenc Chimie|METHOD FOR CLEANING FILTERING SURFACES|
    JPH0620201U|1992-05-13|1994-03-15|株式会社テイモー|Tie|
    US5590983A|1995-09-05|1997-01-07|Angell; Edwin C.|Method of improving soil irrigation with an improved solution grade calcium sulfate dihydrate|
    US7582308B2|2002-12-23|2009-09-01|Kimberly-Clark Worldwide, Inc.|Odor control composition|
    US7438875B2|2003-10-16|2008-10-21|Kimberly-Clark Worldwide, Inc.|Method for reducing odor using metal-modified silica particles|
    US7141518B2|2003-10-16|2006-11-28|Kimberly-Clark Worldwide, Inc.|Durable charged particle coatings and materials|
    US7879350B2|2003-10-16|2011-02-01|Kimberly-Clark Worldwide, Inc.|Method for reducing odor using colloidal nanoparticles|
    US7413550B2|2003-10-16|2008-08-19|Kimberly-Clark Worldwide, Inc.|Visual indicating device for bad breath|
    US7837663B2|2003-10-16|2010-11-23|Kimberly-Clark Worldwide, Inc.|Odor controlling article including a visual indicating device for monitoring odor absorption|
    US7754197B2|2003-10-16|2010-07-13|Kimberly-Clark Worldwide, Inc.|Method for reducing odor using coordinated polydentate compounds|
    US7678367B2|2003-10-16|2010-03-16|Kimberly-Clark Worldwide, Inc.|Method for reducing odor using metal-modified particles|
    US7794737B2|2003-10-16|2010-09-14|Kimberly-Clark Worldwide, Inc.|Odor absorbing extrudates|
    US7488520B2|2003-10-16|2009-02-10|Kimberly-Clark Worldwide, Inc.|High surface area material blends for odor reduction, articles utilizing such blends and methods of using same|
    US7582485B2|2003-10-16|2009-09-01|Kimberly-Clark Worldride, Inc.|Method and device for detecting ammonia odors and helicobacter pylori urease infection|
    US20150175424A1|2013-12-23|2015-06-25|Italo Innamorati|Process for the production of phosphoric acid|
    WO2017039011A1|2015-09-04|2017-03-09|ライオン株式会社|Ethoxylation catalyst and manufacturing method therefor|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    JP50098305A|JPS5851884B2|1975-08-13|1975-08-13|
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