公开(公告)号：US3862297A

公开(公告)日：1975-01-21

申请号：US9754170

申请日：1970-12-14

申请人： LAPORTE INDUSTRIES LTD

发明人： CLARIDGE MAURICE ARTHUR ,  PEARSE RICHARD VYVIAN

IPC分类号： C01G23/00 ,  C01G23/053 ,  C01G23/08 ,  C09C1/00 ,  C09C1/36 ,  C01G23/04 ,  C01G23/06

CPC分类号： C09C1/3692 ,  C01G23/0534 ,  C01G23/08 ,  C01P2002/52 ,  C01P2004/03 ,  C01P2006/62 ,  C09C3/063 ,  C09C3/08

摘要： The process comprises hydrolysing a solution of titanium sulphate, washing the titanium dioxide hydrolysate, and then calcining the hydrolysate at a temperature from 750 to 1000*C. to yield titanium dioxide pigment having desirable properties in terms of brightness, opacity, and/or texture. A rutile-promoting seed is incorporated with the titanium sulphate solution and/or with the hydrolysate. In the process, the pH of the wet hydrolysate is in the range of from 6 to 10 immediately before calcination, and there is present in the hydrolysate immediately before calcination an ammonium compound that will be expelled, together with any decomposition products thereof, during calcination; a treating agent or agents selected from beryllium, aluminium, magnesium, zinc and compounds thereof, and a treating agent or agents selected from sodium potassium, rubidium, caesium, and compounds thereof, with the proviso that lithium and/or a lithium compound may be substituted for any or all of the agent or agents selected from the first-mentioned and/or second-mentioned group. The total quantity of the ammonium compound is at least 0.7 percent (calculated as ammonium sulphate); the total quantity of agents from the first-mentioned group is from 0.02 to 0.50 percent (calculated as the metal oxide or oxides); and the total quantity of agents from the secondmentioned group is from 0.05 to 1.0 percent (calculated as the alkali metal oxide or oxides). All the percentages are by weight and are based on the weight of titanium dioxide. The ammonium compound and the treating agent or agents may be incorporated with the hydrolysate in any order. Conveniently, any necessary pH adjustment is effected at least in part by using an alkaline ammonium compound.

摘要翻译： 该方法包括水解硫酸钛溶液，洗涤二氧化钛水解物，然后在750〜1000℃的温度下煅烧水解产物，得到在亮度，不透明度和/或质地方面具有期望性能的二氧化钛颜料 。 将金红石促进种子与硫酸钛溶液和/或与水解产物结合。 在此过程中，湿式水解产物的pH在煅烧前立即在6至10℃范围内，在煅烧之前立即在水解产物中存在待煅烧的铵化合物及其任何分解产物在煅烧过程中 ; 选自铍，铝，镁，锌及其化合物的处理剂或试剂，以及选自钠钾，铷，铯及其化合物的处理剂或试剂，条件是锂和/或锂化合物可以是 代替选自前述和/或第二组的任何或所有试剂或试剂。 铵化合物的总量至少为0.7％（以硫酸铵计）; 来自前述组的试剂的总量为0.02〜0.50％（以金属氧化物计算）; 并且来自第二组的试剂的总量为0.05〜1.0％（以碱金属氧化物计算）。 所有的百分数均以重量计，基于二氧化钛的重量。 铵化合物和处理剂或试剂可以以任何顺序与水解产物结合。 方便地，至少部分地通过使用碱性铵化合物进行任何必要的pH调节。