公开(公告)号：EP3116843A1

公开(公告)日：2017-01-18

申请号：EP15709207.3

申请日：2015-03-12

申请人： LANXESS Deutschland GmbH

发明人： FRIEDRICH, Holger ,  BOLL, Matthias ,  STRASSER, Hans ,  ORTMANN, Rainer

IPC分类号： C04B35/01 ,  C04B35/04 ,  C04B35/047 ,  C04B35/105 ,  C04B35/12 ,  C04B35/42 ,  C04B35/48 ,  C04B35/63 ,  C04B35/66

CPC分类号： C04B35/105 ,  C04B35/047 ,  C04B35/12 ,  C04B35/26 ,  C04B35/42 ,  C04B35/482 ,  C04B35/6265 ,  C04B35/63 ,  C04B35/6303 ,  C04B35/6306 ,  C04B35/634 ,  C04B35/66 ,  C04B2235/3217 ,  C04B2235/3231 ,  C04B2235/3241 ,  C04B2235/3243 ,  C04B2235/3244 ,  C04B2235/422 ,  C04B2235/424 ,  C04B2235/425 ,  C04B2235/656 ,  C04B2235/72 ,  C04B2235/728 ,  C04B2235/761 ,  C04B2235/763 ,  C04B2235/96

摘要： Refractory materials obtained by heating a mixture Z to at least 250°C, preferably to at least 350°C, characterized in that the mixture Z comprises the following components: * 80% to 97% by weight of a component A, where the percentages by weight are based on the total mass of components A, B and, if present, C in the mixture Z which consists to an extent of at least 80% by weight, preferably to an extent of at least 90% by weight, where the percentages by weight are based on component A, of one or more of the oxides selected from the group consisting of Al
2 O
3 , Zr O
2 , Be O, Mg O, Ti O
2 , Fe
2 O
3 , Cr
2 O
3 , La
2 O
3 , Ta
2 O
5 and SnO
2 , and * 3% to 15% by weight of a component B, where the percentages by weight are based on the total mass of components A, B and, if present, C in the mixture Z, and component B comprises to an extent of at least 80% by weight, preferably to an extent of at least 85% by weight, more preferably to an extent of at least 90% by weight, where the percentages by weight are based on component B, a mixed crystal having spinel structure comprising at least the oxides Fe
2 O
3 , Al
2 O
3 , Mg O and Cr
2 O
3 , where the mixed crystal having spinel structure of component B contains * 30% to 80% by weight, preferably 40% to 68% by weight, of Fe
2 O
3 , * 10% to 60% by weight, preferably 15% to 43% by weight, of Al
2 O
3 , * 5% to 55% by weight, preferably 10% to 38% by weight, of MgO and * 5% to 55% by weight, preferably 7% to 35% by weight, of Cr
2 O
3 , where the percentages by weight are based on the mass of the mixed crystal having spinel structure, and * 0% to 15% by weight of a component C, where the percentages by weight are based on the total mass of components A, B and, if present, C in the mixture Z which consists to an extent of at least 86% by weight, preferably to an extent of at least 92% by weight, where the percentages by weight are based on component C, of carbon.

摘要翻译： 通过将混合物Z加热至至少250℃，优选至少350℃获得的耐火材料，其特征在于混合物Z包含以下组分：80重量％至97重量％的组分A，其中百分比 重量百分比是基于组分A，B的总质量，如果存在，混合物Z中的C为至少80重量％，优选至少90重量％的程度，其中 重量百分比基于选自Al 2 O 3，ZrO 2，Be O，MgO，TiO 2，Fe 2 O 3，Cr 2 O 3，La 2 O 3，Ta 2 O 5和SnO 2中的一种或多种氧化物的组分A和* 3％ 至15重量％的组分B，其中重量百分比基于组分A，B的总质量，如果存在，则混合物Z中的C和组分B包含至少80％的程度 重量，优选至少85重量％，更优选至少90重量％的程度，其中重量百分比 基于组分B的具有尖晶石结构的混晶，至少包含氧化物Fe 2 O 3，Al 2 O 3，MgO和Cr 2 O 3，其中具有组分B的尖晶石结构的混合晶体含有30％至80％重量比，优选40％至 68重量％的Fe 2 O 3，* 10〜60重量％，优选为15〜43重量％的Al 2 O 3，* 5〜55重量％，优选为10〜38重量％的MgO及 * 5重量％至55重量％，优选7重量％至35重量％的Cr 2 O 3，其中重量百分比基于具有尖晶石结构的混合晶体的质量，和* 0重量％至15重量％ 组分C，其中重量百分比基于组分A，B的总质量，如果存在，混合物Z中的C为至少86重量％，优选至少为92重量 重量％，其中重量百分比是基于组分C的碳。

公开(公告)号：EP2655258A1

公开(公告)日：2013-10-30

申请号：EP11802947.9

申请日：2011-12-21

申请人： LANXESS Deutschland GmbH

发明人： ORTMANN, Rainer ,  STENGER, Matthias ,  FRIEDRICH, Holger ,  VAN ROOYEN, Daniel ,  KALIDEEN, Naveen ,  BOLL, Matthias

IPC分类号： C01G37/00 ,  C01G37/14 ,  C01G37/033 ,  C01G37/02

CPC分类号： C01G37/006 ,  C01G37/02 ,  C01G37/14 ,  C01P2006/80

摘要： The invention relates to a method for producing alkali metal ammonium chromate double salts of the formula M
x (NH
4 )
y Cr0
4 or hydrates thereof, where M stands for Na or K, wherein Na is especially preferred, x stands for a number from 0.1 to 0.9, preferably from 0.4 to 0.7, y stands for a number from 1.1 to 1.9, preferably from 1.3 to 1.6, and the sum of x and y is 2, comprising the following steps: a) reacting alkali metal dichromate and ammonia in an aqueous medium and precipitating the obtained alkali metal ammonium chromate double salt, b) separating the alkali metal ammonium chromate double salt obtained in step a) from the mother liquor, c) reacting the mother liquor containing alkali metal monochromate obtained from step b) with carbon dioxide, possibly after said mother liquor has been concentrated, and precipitating the alkali metal hydrogen carbonate arising from the reaction, d) separating the alkali metal hydrogen carbonate obtained in step c), and e) returning the mother liquor containing alkali metal dichromate obtained from step d) to step a).