RU2219127C2 - Method for precipitation of silica from hydrothermal heat carrier with simultaneous addition of lime and seawater - Google Patents

Method for precipitation of silica from hydrothermal heat carrier with simultaneous addition of lime and seawater Download PDF

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Publication number
RU2219127C2
RU2219127C2 RU2002106156A RU2002106156A RU2219127C2 RU 2219127 C2 RU2219127 C2 RU 2219127C2 RU 2002106156 A RU2002106156 A RU 2002106156A RU 2002106156 A RU2002106156 A RU 2002106156A RU 2219127 C2 RU2219127 C2 RU 2219127C2
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RU
Russia
Prior art keywords
silica
solution
lime
precipitation
seawater
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RU2002106156A
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Russian (ru)
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RU2002106156A (en
Inventor
В.В. Потапов
Г.А. Карпов
К.О. Поваров
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Потапов Вадим Владимирович
Карпов Геннадий Александрович
Поваров Константин Олегович
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Priority to RU2002106156A priority Critical patent/RU2219127C2/en
Publication of RU2002106156A publication Critical patent/RU2002106156A/en
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Abstract

FIELD: chemical technology. SUBSTANCE: invention relates to method for precipitation of different forms of silica from hydrothermal separate that can be used under conditions of geoelectric power plants, geoheating and power plants and in hydrothermal layers. This method can be used for treatment a separate at 20-160 C and pH value from 7.0 to 9.6. Method involves preparing solution supersaturated by amorphous silica, ageing and polymerization with addition of coagulating agents and stirring solution for formation of flakes and precipitation of silica, separation of flakes from cleared solution and preparing flake slime. At the stage of silica precipitation seawater is added to solution with lime simultaneously and seawater must contain total concentration of calcium and magnesium cations from 800 to 1200 mg/kg. Seawater consumption depends on lime consumption and required level of residual concentration of silica in solution after treatment and calcium concentration in precipitated material. Addition of seawater allows reducing lime consumption and to diminish alternation of pH index of solution after treatment with lime. Method provides the possibility to carry out stable precipitation of silica in small consumption of lime and consumption below critical that provides reduction of calcium part in precipitated material to value below 1.0 weight %. EFFECT: improved precipitation method. 1 dwg, 5 tbl, 3 ex

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Текст описания в факсимильном виде (см. графическую часть) То Description text in facsimile form (see graphic part)

Claims (1)

Способ осаждения различных форм кремнезема из жидкой фазы гидротермального теплоносителя, включающий подготовку раствора, пересыщенного по аморфному кремнезему, старение раствора и полимеризацию мономерного кремнезема с образованием коллоидных частиц кремнезема, добавление коагулянтов во время старения и полимеризации для формирования микроструктуры кремнезема без его осаждения из раствора, добавление коагулянтов и перемешивание раствора для образования хлопьев и осаждения кремнезема, отделение хлопьев осадка от осветленного раствора и получение шлама хлопьев, отличающийся тем, что на стадии осаждения кремнезема в качестве коагулянтов одновременно с известью в раствор добавляют морскую воду, расход извести и морской воды варьируют в зависимости от требуемой остаточной концентрации кремнезема в растворе, концентрации кальция в осажденном материале или микроструктуры кремнезема, причем раствор обрабатывают при 160-20°С, начальном показателе рН 7,0-9,6 и при обработке добавляют морскую воду с суммарной концентрацией катионов кальция и магния 800-1200 мг/кг и более и показателем рН 7,0-8,5.A method of precipitating various forms of silica from the liquid phase of a hydrothermal coolant, including preparing a solution supersaturated with amorphous silica, aging the solution and polymerizing monomeric silica to form colloidal silica particles, adding coagulants during aging and polymerization to form a silica microstructure without precipitating it coagulants and mixing the solution to form flocs and precipitate silica, separating the floc sediment from the clarified solution and floc sludge production, characterized in that at the stage of silica precipitation, seawater is added to the solution simultaneously with lime as coagulants, the consumption of lime and sea water vary depending on the required residual concentration of silica in the solution, the concentration of calcium in the precipitated material or the microstructure of silica moreover, the solution is treated at 160-20 ° C, an initial pH of 7.0-9.6, and sea water with a total concentration of calcium and magnesium cations of 800-1200 mg / kg or more and exponent pH 7.0-8.5.
RU2002106156A 2002-03-06 2002-03-06 Method for precipitation of silica from hydrothermal heat carrier with simultaneous addition of lime and seawater RU2219127C2 (en)

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RU2002106156A RU2219127C2 (en) 2002-03-06 2002-03-06 Method for precipitation of silica from hydrothermal heat carrier with simultaneous addition of lime and seawater

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RU2002106156A RU2219127C2 (en) 2002-03-06 2002-03-06 Method for precipitation of silica from hydrothermal heat carrier with simultaneous addition of lime and seawater

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RU2002106156A RU2002106156A (en) 2003-10-27
RU2219127C2 true RU2219127C2 (en) 2003-12-20

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2537406C1 (en) * 2013-09-04 2015-01-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Грозненский государственный нефтяной технический университет имени академика М.Д. Миллионщикова" Method of precipitating silica from thermal waters

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ROTHBAUM H.P. et.al. Removal of Silica from Geothermal Discharge Waters by Presipitation of Useful Calcium Silicates, PROCEEDINGS. SECOND UNITED NATIONS SYMPOSIUM ON THE DEVELOPMENT AND USE OF GEOTHERMAL RESOURCES. - San Francisco, California, USA, 20-29 May, 1975, p.1417-1425. АЙЛЕР Р. Химия кремнезема. - М.: Мир, 1982, т.1, с.23-26, т.2, 422-430. *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2537406C1 (en) * 2013-09-04 2015-01-10 Федеральное государственное бюджетное образовательное учреждение высшего профессионального образования "Грозненский государственный нефтяной технический университет имени академика М.Д. Миллионщикова" Method of precipitating silica from thermal waters

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Effective date: 20130307