METHOD OF OBTAINING SURFACE-MODIFIED MINERAL MATERIAL, RESULTING PRODUCTS AND APPLICATION THEREOF

FIELD: chemistry.SUBSTANCE: invention can be used in the chemical industry. A method of modifying the surface of a mineral material, which is in the form of water sludge or suspension, having pH from 5 to 10, includes addition of, at least, one agent to the said mineral material. The said agent is a...

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Hauptverfasser: VAJTTSEL' KHANS-JOAKHIM, SHEL'KOPF JOAKHIM, VIMMER GJUNTER
Format: Patent
Sprache:eng ; rus
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Zusammenfassung:FIELD: chemistry.SUBSTANCE: invention can be used in the chemical industry. A method of modifying the surface of a mineral material, which is in the form of water sludge or suspension, having pH from 5 to 10, includes addition of, at least, one agent to the said mineral material. The said agent is added in an amount, corresponding to 0.04-1 mg counted per dry weight of the agent per mof the total surface of the mineral material. Suspension of the mineral material, which has pH value constituting less than 10 and higher than 7, if a value of an isoelectric point of the said mineral material exceeds 7, and exceeds the value of the isoelecric point of the said material, if the value of the said isoelectric point constitutes 7 or lower. The said agent is in the form of a water solution or a stable water colloid, which has pH lower than 6, and is formed as a result of mixing in a water medium of, at least, one compound, containing phosphonic acid with one or more metal cations or one or more metal-containing cationic compounds. The said metal is selected from the group, consisting of aluminium, zirconium, zinc, cobalt, chrome, iron, copper, tin, titanium and their mixtures. The compound, which contains phosphonic acid and the said cations of metals or the cationic metal-containing compounds, is added in such amount that a molar ratio of phosphonate hydroxyl groups to the metal cation or the metal-containing cationic compound constitutes from 10:1 to 2:1.EFFECT: invention makes it possible to form filtration or centrifuged sediment of a small volume with high content of solid substances after suspension dehydration.26 cl, 5 tbl, 2 ex Изобретение может быть использовано в химической промышленности. Способ модифицирования поверхности минерального материала, находящегося в виде водного шлама или суспензии, имеющих рН от 5 до 10, включает добавление, по меньшей мере, одного агента к указанному минеральному материалу. Указанный агент добавляют в количестве, соответствующем 0,04-1 мг в расчете на сухую массу агента на мобщей поверхности минерального материала. При этом получают суспензию минерального материала, имеющую значение рН, которое составляет менее 10 и более 7, если значение изоэлектрической точки указанного минерального материала превышает 7, и превышает значение изоэлектрической точки указанного минерального материала, если значение указанной изоэлектрической точки составляет 7 или ниже. Указанный агент находится в форме водного раствора или стабильного вод