| Title | Study of Sorption Extraction of Boron from the Geothermal Heat Carriers |
|---|---|
| Authors | T.P. Belova, B.E Parshin, A.S.Latkin, O.A. Yakovishina, T.I. Kornilova, L.D. Zernova, T.I Ratchina, |
| Year | 2009 |
| Conference | Stanford Geothermal Workshop |
| Keywords | boric acid, sorptive capacity, industrial solutions. |
| Abstract | Processes of extraction of boric acid from the model and technogenic solutions by anionites ÀSD-4-1p, by AV-16GS, ÀN-31, ÀV-17-8 are investigated. It is ascertained that sorption capacity of the investigated sorbents makes up 3,7–4,1 mg/g depending on the form, poorly depends from ðÍ in an investigated range. At sorption from natural and technogenic solutions the increase of sorption capacity up to 7,7–41,5 % is observed. In the conditions of developing of the geothermal power engineering on Kamchatka there is an important question concerning the utilization of the spent heat-carrier for the aim of preservation of ecological conditions in the areas of the geothermal power plants. The utilization can be carried out in two directions: injection of spent heat-carrier into wells and chemical-and-technological purification. In the first variant the valuable components such as boron, lithium, silica oxide, etc. are irrevocably lost. The second variant requires the additional technological equipment (Belova T.P, Latkin A.S., 2003). However, cost of the extracted components makes us to give preference to the chemical-and-technological method of cleaning of spent heat-carrier. Sorption technologies dominate among well-known methods of purification of natural waters and sewage. Specificity of the industrial process of extraction of the chemical compounds from natural water is in necessity to process a huge amount of water, as a content of extracted components is usually not great. Therefore, for extraction of the valuable components the sorption methods (Belova T.P, Latkin A.S., 2006) are widely applied. For these methods the following characteristics are required: high selectivity, small power intensity, the minimum expense of reagents, possibility of multicyclic use of a sorbent. One of the elements which could be extracted from natural waters is boron. At the present time it is profitable to extract boron from technogenic solutions of the working geothermal power plants: Pauzhetsky and Mutnovsky. World experience of extraction of boron in the form of boric acid from hydrothermal solutions began its history on a deposit Lardarello (Italy) in XVIII century, for a long before the energy of the geothermal heat-carriers began to be used for power generation. On the hydrothermal deposit in Turkey for successful extraction of various forms of boron a sorbent–Amberlit IRA 743 is used. A group of employees have investigated the processes of sorption of boron and other components from the spent heat-carrier (Paholkov V.S, and all., 1979; "Technology of boric compounds,” 1980) in 80-th years of ÕÕ century on the first Russian geothermal power plant (Pauzhetka, Kamchatka). However, the technology has not been introduced in manufacture for the objective reasons. |