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    • 2. 发明公开
    • Process for the manufacture of pure amorphous silica from rocks
    • Verfahren zur Herstellung von reinen amorphenKieselsäurenaus Gesteinen。
    • EP0610136A1
    • 1994-08-10
    • EP94400218.7
    • 1994-02-02
    • ROTEM AMFERT NEGEV LTD.
    • Iosef, Alexander
    • C01B33/193
    • C01B33/193C01P2002/02C01P2006/11C01P2006/12C01P2006/80C01P2006/82
    • A process for the manufacture of pure amorphous silica from rocks containing non-crystalline silica is described. The process comprises the steps of:
      (a) dissolution of said rock in an alkaline solution comprising sodium hydroxide and sodium carbonate, obtaining a solution of sodium silicate; (b) precipitation of pure amorphous silica by adding sodium bicarbonate into said sodium silicate and co-producing sodium carbonate, the weight ratio between SiO₂ and Na₂O in said dissolution step is in the range of between 0.5 to 3.0; and (c) the sodium carbonate sclution is transformed into crystalline sodium bicarbonate, by a salting out reaction with sodium chloride, being recycled to the process. According to a preferred embodiment, the alkaline solution is obtained by the caustification of sodium carbonate with calcium hydroxide. The preferred concentration of sodium hydroxide in said dissolution step is in the range of 4% to 14% by weight.
    • 描述了从含有非结晶二氧化硅的岩石制造纯无定形二氧化硅的方法。 该方法包括以下步骤:(a)将所述岩石溶解在包含氢氧化钠和碳酸钠的碱性溶液中,得到硅酸钠溶液; (b)通过向所述硅酸钠中加入碳酸氢钠并共同生产碳酸钠沉淀纯无定形二氧化硅,所述溶解步骤中SiO 2与Na 2 O的重量比在0.5至3.0的范围内; 和(c)通过与氯化钠的盐析反应将碳酸钠溶液转化成结晶碳酸氢钠,再循环到该方法中。 根据优选的实施方案,碱性溶液是通过用氢氧化钙对碳酸钠进行除碱而得到的。 所述溶解步骤中优选的氢氧化钠浓度在4重量%至14重量%的范围内。
    • 3. 发明公开
    • Process for the manufacture of disodium phosphate
    • Verfahren zur Herstellung von Natriummonohydrogenphosphat。
    • EP0240635A1
    • 1987-10-14
    • EP86304443.4
    • 1986-06-10
    • NEGEV PHOSPHATES LTD.
    • Iosef, AlexanderBar-On, Menachem
    • C01B25/30
    • C01B25/303
    • A process for the manufacture of disodium phosphate of a high purity without utilising organic solvents. Monosodium sulfate is reacted, at a temperature in the range of 40 to 100°C with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof, in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially complete eliminated with the solid gypsum or dicalcium phosphate resulted thereto. After separating said solid, the filtrate is treated in two neutralization stages: first by a calcium constituent selected from calcium carbonate, calcium hydroxide or mixtures thereof and separating the formed dicalcium phosphate, followed by a 'second neutralization with an alkali sodium constitu- lent selected from sodium hydroxide, sodium carbonate and sodium bicarbonate or mixtures thereof at a pH in the range of 8.0 to 9.5. From the resulted filtrate, pure disodium phosphate is obtained by crystallisation.
    • 一种制造高纯度磷酸二钠而不使用有机溶剂的方法。 在磷酸的存在下,硫酸硫酸钠与选自磷酸盐岩,磷酸二钙或其混合物的磷酸盐成分在40至100℃的温度下反应。 存在于起始磷酸盐岩中的普通金属杂质,有机物质和氟化物基本上完全被固体石膏或磷酸二钙所消除。 在分离所述固体之后,将滤液在两个中和阶段进行处理:首先用选自碳酸钙,氢氧化钙或其混合物的钙成分进行处理,分离所形成的磷酸二钙,然后用选自氢氧化钠的碱金属钠组分进行第二次中和 ,碳酸钠和碳酸氢钠或其混合物,pH在8.0至9.5的范围内。 从所得滤液中,通过结晶获得纯磷酸二钠。
    • 4. 发明公开
    • Process for the manufacture of monopotassium phosphate
    • 生产磷酸一钾的方法
    • EP0208422A2
    • 1987-01-14
    • EP86304442.6
    • 1986-06-10
    • NEGEV PHOSPHATES LTD.
    • Iosef, AlexanderBar-On, Menachem
    • C01B25/30
    • C01B25/301C01B25/303
    • A process for the manufacture of monopotassium phosphate of a high purity without utilizing organic solvents. Monopotassium sulfate is reacted, at a temperature in the range of 40 to 100°C with a phosphate constituent selected from phosphate rock, dicalcium phosphate or mixtures thereof in the presence of phosphoric acid. The common metal impurities, organic matter and fluorides present in the starting phosphate rock are substantially eliminated, with the calcium sulfate resulted thereto. After separating out the calcium sulfate, the filtrate is neutralised to a pH in the range of 3 to 7, with a calcium-containing compound comprising Ca(OH) 2 , CaO or CaC0 3 , or mixtures thereof. From the filtrate obtained, pure monopotassium phosphate is crystallised out.
    • 不使用有机溶剂制造高纯度磷酸一钾的方法。 在磷酸存在下,硫酸二钾在40-100℃的温度下与选自磷酸盐岩,磷酸二钙或其混合物的磷酸盐组分反应。 存在于起始磷酸盐岩石中的普通金属杂质,有机物质和氟化物基本上被消除,随之产生硫酸钙。 分离出硫酸钙后,用含钙化合物(包括Ca(OH)2,CaO或CaCO 3或其混合物)将滤液中和至3-7的pH。 从得到的滤液中,将纯的磷酸一钾结晶出来。
    • 7. 发明公开
    • Process for the manufacturing of sulfur-containing fertilizers
    • Verfahren zur Herstellung von schwefelenthaltendenDüngemitteln
    • EP0719748A2
    • 1996-07-03
    • EP95402939.3
    • 1995-12-26
    • ROTEM AMFERT NEGEV LTD.
    • Stern, ShmuelBen-Yoseph, Eli
    • C05G3/00B01J2/00C05B17/00C05B19/00
    • C05G3/0023
    • The invention relates to a process for obtaining sulfur-containing fertilizers. According to the invention, a substrate containing fertilizer particles is heated to a temperature above the melting point of sulfur and subsequently by admixing with the sulfur, the latter is melted by the heat provided by said preheated fertilizer particles, producing a homogeneous coating on the fertilizer particles. According to a preferred embodiment the temperature at which the fertilizer particles are heated will be in the range of 140°C to 280°C. Other materials may be added either into the phosphate or to the resulted mixture, having the purpose to modify the physical nature of the sulfur. The sulfur availability from the coated fertilizer particles may be adjusted by varying the temperature at which the fertilizer particles are heated. Typical examples of fertilizers useful for the process are: phosphate rock, superphosphate, monopotassium phosphate, triple superphosphate and potassium chloride.
    • 本发明涉及一种获得含硫肥料的方法。 根据本发明,将含有肥料颗粒的底物加热到高于硫熔点的温度,随后通过与硫混合,后者由所述预热的肥料颗粒提供的热量熔化,在肥料上产生均匀的涂层 粒子。 根据优选的实施方案,肥料颗粒被加热的温度将在140℃至280℃的范围内。其它材料可以添加到磷酸盐或所得混合物中,目的是改变物理 硫的性质。 可以通过改变肥料颗粒被加热的温度来调节来自涂覆的肥料颗粒的硫的可用性。 用于该方法的肥料的典型实例是:磷酸盐岩,过磷酸钙,磷酸二氢钾,过磷酸三钙和氯化钾。