摘要:
The present invention relates to an improved poly aluminium-silicate composite composition, an improved method for preparing said composition as well as intermediate poly silicate and aluminium-silicate compositions and their preparation. Moreover, the present invention relates to the use of a said poly aluminium-silicate composition as a coagulant in purification of water, such as drinking water or waste water.
摘要:
Provided is a method for the preparation of high solids, low sodium content polysilicic acid (PSA). The method includes the steps of acidifying a waterglass solution such that the pH of the solution falls to 4 or less in a time period of less than about 20 seconds; and contacting the reduced pH waterglass solution with an acid exchange resin. In a preferred embodiment, the PSA is prepared in a recirculating loop.
摘要:
Изобретение относится к области сельского хозяйства. Способ заключается в том, что готовят раствор кремнесодержащего сырья путем добавления в профильтрованную воду силиката натрия с силикатным модулем 3,32 при тщательном перемешивании с подогревом до 50-55°C. Кроме того, готовят водный раствор аккумуляторного электролита путем добавления в профильтрованную воду аккумуляторного электролита плотностью 1, 835 г/см 3 при тщательном перемешивании с подогревом до 50- 55°C. Далее смешивают в равных объемах водный раствор аккумуляторного электролита и раствор кремнесодержащего сырья в емкости посредством перемешивающего устройства. Осуществляют нормализацию смеси путем добавления в нее водного раствора аккумуляторного электролита до достижения водородного показателя рН в пределах 5-7. Производят фильтрацию и расфасовку полученного сорбента в мерные емкости. Преимущество изобретения заключается в повышении производительности, поскольку исключается необходимость осуществления длительной по времени операции созревания гидрогеля.
摘要翻译:本发明涉及农业领域,涉及一种方法,其包括通过向过滤水中加入二氧化硅模数为3.32的硅酸钠并通过在加热至50-55℃的同时充分混合来制备含硅原料溶液 C。 该方法还包括通过向过滤的水中加入密度为1.835g / cm 3的电池电解质并在加热到50-55℃的温度下充分混合来制备电池电解质的水溶液。 电池电解质的水溶液和含硅原料的溶液在等容器中使用混合装置混合在容器中。 通过加入积聚电解质的水溶液使混合物标准化,直到氢pH值达到5-7。 然后将由此获得的吸附剂过滤并预先包装在测量容器中。 本发明具有提高生产率的优点,因为不再需要进行长时间的水凝胶成熟过程。
摘要:
This invention relates to a process for converting silica to polysilicate gels or hydrogels by combining an aqueous silica source with a CO 2 feed stream as the gel initiator, whereby the reaction stream is propelled at high velocity and turbulence maintaining the CO 2 uptake rate in the reaction stream. The invention also relates to a process for converting silica to polysilicate by pre-carbonating water at pressures of equal to or greater than 100 psig before initiating the polysilicate reaction.
摘要翻译:本发明涉及通过将水性二氧化硅源与CO 2 CO 2原料流组合作为凝胶引发剂将二氧化硅转化成聚硅酸盐凝胶或水凝胶的方法,由此反应流以高速度和湍流维持推进 反应流中的CO 2摄取速率。 本发明还涉及通过在开始聚硅酸盐反应之前将等于或大于100psig的压力的水预碳酸化来将二氧化硅转化为聚硅酸盐的方法。
摘要:
The present invention relates to a process for producing an aqueous silica-based sol which comprises: (a) providing a cationic ion exchange resin having at least part of its ion exchange capacity in hydrogen form; (b) bringing said ion exchange resin in contact with an aqueous alkali metal silicate to form an aqueous slurry; (c) stirring said aqueous slurry until the pH of the aqueous phase is in the range of from 5.0 to 11.5; and/or alternatively, stirring said aqueous slurry to allow particle aggregation or microgel formation corresponding to an S value up to 45 %, and obtain a pH of the aqueous phase of at least 5.0; (d) adjusting the pH of said aqueous phase to above 9.0 using one or more materials comprising at least one aluminium compound; and (e)separating said ion exchange resin from the aqueous phase after step (c) or after step (d). The invention also relates to a silica-based sol having an S value within the range of from 15 to 25 %, mole ratio Si:Al in the range of from 20:1 to 50:1, mole ratio Si:X, where X = alkali metal, in the range of from 5:1 to 17:1, SiO 2 content of at least 5 % by weight and containing silica-based particles having a specific surface area of at least 300 m 2 /g. The invention further relates to process for producing paper which comprises: (i) providing an aqueous suspension comprising cellulosic fibres; (j) adding to the suspension one or more drainage and retention aids comprising a silica-based sol according to the invention; and (k) dewatering the obtained suspension to provide a sheet or web of paper.
摘要:
The present invention provides a continuous process for the conversion of sodium silicate to silicic acid, wherein a moving bed of a protonated ion exchange resin is contacted with an inlet stream of sodium silicate to provide an outlet stream of silicic acid. The outlet stream of silicic acid produced thereby can be processed into a variety of silica products. The outlet moving bed of spent sodium-enriched ion-exchange resin is continuously regenerated into protonated ion-exchange resin by contacting the spent resin with an inlet stream of acid of sufficient strength to exchange the sodium ions in the spent resin with a proton. The regenerated protonated ion-exchange resin is continuously recycled back into the sodium silicate stream for further production of silicic acid.
摘要:
A temperature-activated polysilicic acid is prepared by heating an acidified aqueous alkali metal silicate. The temperature-activated polysilicic acid is used in the production of paper for improvement of retention and water removal.
摘要:
The present invention relates to a composition comprising a polymerized C10-30alkanetriC1- 5alkoxysilane, a surfactant, an organic acid catalyst and water, and optionally an inorganic component and to a process for manufacturing said composition. The invention also relates to uses of the composition as a water repellant coating, and/or as a mold-resistant coating and/or as a fire- resistant coating on organic or inorganic surfaces.
摘要:
La presente invención se refiere a una composición fertilizante líquida y un método de preparación de la misma, que comprende silicato de potasio, un regulador de pH, un emulsificante y un disolvente útiles en la prevención y control de enfermedades de plantas causadas por diferentes patógenos.
摘要:
A method for producing a micron-size spherical silica aerogel having a selectable or controllable average particle size, the method includes producing a surface—modified silica sol by adding a first organosilane compound to a aqueous acid-silica sol, which comprises an inorganic acid and a water glass solution, with a pH less than 3, dispersive mixing a non-polar organic solvent, a second organosilane compound, and the surface-modified silica sol, at a selected stirring rate which is inversely related to an average particle size, without adding any surfactant or dispersant, a micron-size spherical silica hydrogel and further a hydrophobic micron-size spherical silica gel are then produced. Following by drying or stirring the hydrophobic micron-size spherical silica gel to obtain a controllable micron-size silica aerogel in a spherical and powder forms, respectively.