SU1171433A1 - Method of extracting calcium fluoride from fluorine- and phosphorus-containing waste water - Google Patents
Method of extracting calcium fluoride from fluorine- and phosphorus-containing waste water Download PDFInfo
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- SU1171433A1 SU1171433A1 SU833686031A SU3686031A SU1171433A1 SU 1171433 A1 SU1171433 A1 SU 1171433A1 SU 833686031 A SU833686031 A SU 833686031A SU 3686031 A SU3686031 A SU 3686031A SU 1171433 A1 SU1171433 A1 SU 1171433A1
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- calcium fluoride
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- fluorine
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Abstract
1. СПОСОБ ИЗВЛЕЧЕНИЯ ФТОРИДА КАЛЬЦИЯ ИЗ ФТОР- И ФОСФОРСОДЕРЖАЩИХ СТОЧНЫХ вод, включающий обработку кальций содержащим реагентом при рН 3-4 с последующим отделением осадка и нейтрализацией воды, о тличающийс тем, что, с целью повьшени содержани в осадке фторида кальци и уменьшени в нем количества примесей соединений фосфора , обработку ведут в присутствии кремнефторидов натри и аммони , вводимых в соотношении 0,1:1 к соединени м фосфора, содержащимс в сточных водах. 2. Способ по п. 1, о т л и ч а ющ и и с тем, что в качестве кремнефторидов натри или аммони используют маточные растворы производства g этих солей. (Л1. METHOD FOR EXTRACTING CALCIUM FLUORIDE FROM FLUORINE AND PHOSPHORUS-CONTAINING WASTE WATER, which includes treating calcium with a reagent at pH 3-4 and then separating the precipitate and neutralizing water, in order to increase and decrease calcium fluoride in the precipitate amounts of impurities of phosphorus compounds, the treatment is carried out in the presence of sodium silicofluoride and ammonium, introduced in a ratio of 0.1: 1 to the phosphorus compounds contained in the wastewater. 2. The method according to claim 1, of which is also the fact that mother liquors of the production of these salts are used as sodium or ammonium silicofluorides. (L
Description
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Изобретение относитс к основной химической промышленности, в частности к области очистки фтор- и фосфорсодержащих сточных вод, и может быть использовано дл получени концентрата 5 фторида кальци , примен емого в цементной промьшшенности в качестве минерализатора обжига, а также дл обезвреживани сточных вод.The invention relates to the main chemical industry, in particular to the field of purification of fluorine-containing and phosphorus-containing wastewater, and can be used to produce calcium fluoride concentrate 5, used in cement industry as a calcining mineralizer, as well as for disposal of wastewater.
Целью изобретени вл етс повыше-10 ние содержани в осадке фторида кальци и уменьшени В; нем количества примесе.й срединешй фосфора.The aim of the invention is to increase calcium fluoride in the sediment and reduce B; There are amounts of impurities in it. Medium phosphorus.
Способ 6су1дей.твл етс следующим образом.,15Method 6) 1 as follows. 15
Сточные воды, содержащие соединени фтора и фосфора, обрабатывают соединени ми кальци до рН 3-4, через 15-20 мин после установлени рН ввод т раствор кремнефторида. Образовавшийс 20 в процессе осадок отфильтровывают и промывают, а фильтрат и промывные воды нейтрализуют на второй стадии гидроксидом кальци до рН 7-9.Wastewater containing fluorine and phosphorus compounds is treated with calcium compounds to a pH of 3-4. After 15-20 minutes after the pH has been adjusted, a solution of silicofluoride is introduced. The precipitate formed in the course of 20 is filtered and washed, and the filtrate and washings are neutralized in the second stage with calcium hydroxide to pH 7-9.
Пример 1. Берут 8 л сточньк 25 вод, имеющих состав, мг/л: F 6560; PjOy 4800; Si02 2425; SO 3540, нейтрализуют гидроксидом кальци до рН 3,5, ввод т раствор кремнефторида натри при Соотношении F| 1:0,5. Образовавшийс в системе осадок отдел ют на фильтре и промывают раствором фто{)идбифторида аммони . Отмытый осадок содержит (мас.% в пересчете на сухое вещество ): F 38,2; . 1,6; SiO 1,1; ,7. Фильтрат и промывные воды нейтрализуют известковым молоком до рН 7,5. Другие примеры осуществлени способа приведены в таблице. Из данных таблицы-следует, что при соотношении Р,- SiF более 1:0,1 резко уменьшаетс скорость взаимодействи фосфатов кальци с кремнефторидами , в результате чего За врем протекани технологического процесса не удаетс получить доста .точно чистого осадка фторида кальци (пример 7). При соотношении : SiF менее 1:1 остаточное содержание фтора в осветленной воде превышает предельно допустимую концентрацию дл технологических вод (пример 8 без улучшени качества продукта.Example 1. Take 8 liters of waste 25 water having a composition, mg / l: F 6560; PjOy 4800; Si02 2425; SO 3540, neutralized with calcium hydroxide to pH 3.5; sodium silicofluoride solution is introduced at a ratio F | 1: 0.5. The precipitate formed in the system is separated on a filter and washed with an ammonium fluoro solution of ammonium idifluoride. The washed precipitate contains (wt.% In terms of dry substance): F 38,2; . 1.6; SiO 1.1; , 7. The filtrate and washings are neutralized with lime milk to a pH of 7.5. Other examples of the method are given in the table. From the data of the table-it follows that when the ratio of P, -SiF is more than 1: 0.1, the rate of interaction of calcium phosphates with silicofluorides decreases, as a result of which, during the course of the technological process, it is not possible to obtain sufficiently pure calcium fluoride precipitate (Example 7) . When the ratio: SiF is less than 1: 1, the residual fluorine content in the clarified water exceeds the maximum permissible concentration for process water (example 8 without improving the quality of the product.
Claims (2)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU833686031A SU1171433A1 (en) | 1983-12-30 | 1983-12-30 | Method of extracting calcium fluoride from fluorine- and phosphorus-containing waste water |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SU833686031A SU1171433A1 (en) | 1983-12-30 | 1983-12-30 | Method of extracting calcium fluoride from fluorine- and phosphorus-containing waste water |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| SU1171433A1 true SU1171433A1 (en) | 1985-08-07 |
Family
ID=21098008
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SU833686031A SU1171433A1 (en) | 1983-12-30 | 1983-12-30 | Method of extracting calcium fluoride from fluorine- and phosphorus-containing waste water |
Country Status (1)
| Country | Link |
|---|---|
| SU (1) | SU1171433A1 (en) |
-
1983
- 1983-12-30 SU SU833686031A patent/SU1171433A1/en active
Non-Patent Citations (1)
| Title |
|---|
| Авторское свидетельство СССР № 789413, кл. С 02 F 1/58, 1978. Патент US № 3625648, кл. 210-109, 1971. * |
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