WO2004014547A1 - Verfahren zur thermischen behandlung von kieselgur,thermisch behandelte kieselgur und verwendung einer derartigen kieselgur. - Google Patents
Verfahren zur thermischen behandlung von kieselgur,thermisch behandelte kieselgur und verwendung einer derartigen kieselgur. Download PDFInfo
- Publication number
- WO2004014547A1 WO2004014547A1 PCT/DE2003/002667 DE0302667W WO2004014547A1 WO 2004014547 A1 WO2004014547 A1 WO 2004014547A1 DE 0302667 W DE0302667 W DE 0302667W WO 2004014547 A1 WO2004014547 A1 WO 2004014547A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- kieselguhr
- diatomaceous earth
- crystal
- thermal treatment
- less
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01J—CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOID CHEMISTRY; THEIR RELEVANT APPARATUS
- B01J20/00—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof
- B01J20/02—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material
- B01J20/10—Solid sorbent compositions or filter aid compositions; Sorbents for chromatography; Processes for preparing, regenerating or reactivating thereof comprising inorganic material comprising silica or silicate
- B01J20/14—Diatomaceous earth
Definitions
- the invention relates to a method for the thermal treatment of kieselguhr, a thermally treated kieselguhr with a loss on ignition of less than 2%, preferably less than 1%, and the use of such a kieselguhr.
- Diatomaceous earth is a fine-grained, loose, light, chalky sediment belonging to the pebbles. Because diatomaceous earth comes from organisms, it also contains small amounts of phosphorus, sulfur, calcium, titanium and the like.
- the usual annealed diatomaceous earth is chemically very resistant and consists of the very varied shaped silica-skeleton of single-celled, microscopic algae (diatoms).
- the diatomaceous earth, cleaned of the sand is prepared by drying in rotary kilns and then heating to approx. 700 ° C. The heating or glowing serves to burn organic substances, which cleans the diatomaceous earth. Heating to higher temperatures leads to calcination, the diatomaceous earth becoming white and inert.
- Diatomaceous earth is required, for example, for deep or precoat filtration of media that are difficult to filter.
- a typical application is beer filtration. After fermentation and storage, microorganisms and protein turbidity must be removed from the beer to achieve a certain gloss and stability. These substances quickly occupy and block every membrane surface.
- the diatomaceous earth is added to the flow as a highly porous filter aid. This filter aid ensures that the particle surface is constantly rebuilt and that the filtered particles are spatially installed.
- kieselguhr dosages between 80 and 200 g / hl are common.
- natural diatomaceous earth After being extracted from natural deposits, natural diatomaceous earth can be subjected to a burning process to remove organic components. If the temperatures are kept below 500 ° C, the amorphous structure of the silicon dioxide content is largely retained. At higher firing temperatures, crystalline silicon dioxide is formed in various structural modifications.
- Calcined diatomaceous earth contains silicon dioxide up to 30% by mass in crystalline form. Flux-calcined diatomaceous earth contains up to 45% by mass of crystalline forms of silicon dioxide.
- the corresponding MAK value is 0.3 mg / m 3 .
- the WHO International Agency for Research on Cancer (IARC) classifies quartz and cristobalite in diatomaceous earth as the highest cancer risk class 1.
- crystalline silicon dioxide modifications can trigger silicosis, a lung disease that is always fatal.
- the invention is therefore based on the object of developing a method for the thermal treatment of kieselguhr which leads to a thermally treated kieselguhr which is less hazardous to health.
- a preferred use of such a diatomaceous earth is proposed.
- the object is achieved with a thermal treatment of kieselguhr, in which at least one crystal chemical inhibitor is added before or during the thermal treatment of the kieselguhr.
- the potassium compounds have proven to be particularly advantageous.
- the use of potassium compounds even makes it possible to produce sintered diatomaceous earth which is essentially free of crystalline structures.
- An advantageous process variant provides that the kieselguhr is sintered to coarsen the particles and the crystal chemical inhibitor is added before the sintering or at the same time is used as a flux for flux calcination.
- Another method variant provides that crystal phases are formed for coarsening between Kiselgur particles and the crystal chemical inhibitor is added in the process.
- CSH phases are formed from calcium, silicon and water or hydrogen. Such crystalline CSH phases combine the diatomaceous earth particles. The coarsened mixture is then dried and optionally ground.
- Calcium ions can be added to form the crystal phase.
- an aqueous phase is heated to at least 100 ° C. in a closed container for crystal phase formation.
- the excess pressure in the closed container leads to an advantageous crystal phase formation in the aqueous phase.
- the aqueous phase should be heated to at least 200 ° C., preferably to about 300 ° C., in order to accelerate the chemical reaction at still moderate pressures.
- the thermal treatment described produces a coarser diatomaceous earth which can subsequently be ground to a defined particle size by means of a grinding process.
- the process according to the invention leads to a thermally treated kieselguhr with an ignition loss of less than 2%, preferably less than 1%, which has less than 1% crystalline structures.
- a kieselguhr has no technical disadvantages compared to the previously used kieselguhrs.
- the low percentage of crystalline structures facilitates the handling of the diatomaceous earth and is of great advantage for those who come into contact with the diatomaceous earth, since the health risk is at least significantly reduced when using this diatomaceous earth. This is particularly relevant for the use of thermally treated diatomaceous earth for the deep filtration of liquid media.
- the kieselguhr is partly stored open and transported in order to pour the kieselguhr into larger containers. This creates a lot of dust, which the workers inevitably inhale. This dust pollution in particular leads to occupational health and safety concerns and a heavy burden on the staff.
- Different diatomaceous earths are mixed with strongly basic calcium compounds such as quicklime in an aqueous medium with potassium ions such as potassium hydroxide and heated under pressure at about 250 bar to temperatures up to a maximum of 300 ° C.
- This auto-declaration process is carried out at temperatures between 200 and 300 ° C.
- the corresponding pressures arise under saturated steam conditions.
- calcium, silicon and water form crystalline CSH phases, which cause the diatomaceous earth particles to combine to form larger particles.
- the resulting coarsened mixture is then dried and, if necessary, ground to a defined particle size distribution.
- the use of calcium favors the formation of cristobalite and tridymite, which does not silica used for CSH.
- this reaction is prevented by crystal chemical inhibitors which are added in the form of the potassium hydroxide solution as potassium compound to the diatomaceous earth or the Ca source is replaced by a K source.
- the CSH phase then consists of K ions, Si ions and water.
- An alternative thermal treatment provides that diatomaceous earth is mixed with potassium compounds and the mixture is then burned.
- the thermal treatment leads to a sanitization of the diatomaceous earth.
- the mixture which has been coarsened and optionally sintered is free from crystalline silicon dioxide modifications and can then be ground in order to obtain a diatomaceous earth with a defined particle size distribution.
Landscapes
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Inorganic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Solid-Sorbent Or Filter-Aiding Compositions (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU2003263128A AU2003263128A1 (en) | 2002-08-05 | 2003-08-05 | Method for the thermal treatment of kieselguhr, thermally-treated kieselguhr and use of such a kieselguhr |
DE10393548T DE10393548D2 (de) | 2002-08-05 | 2003-08-05 | Verfahren zur thermischen Behandlung von Kieselgur, thermisch behandelte Kieselgur und Verwendung einer derartigen Kieselgur |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE2002135866 DE10235866B4 (de) | 2002-08-05 | 2002-08-05 | Verfahren zur thermischen Behandlung von Kieselgur, thermisch behandelte Kieselgur und Verwendung einer derartigen Kieselgur |
DE10235866.4 | 2002-08-05 |
Publications (2)
Publication Number | Publication Date |
---|---|
WO2004014547A1 true WO2004014547A1 (de) | 2004-02-19 |
WO2004014547A8 WO2004014547A8 (de) | 2004-04-22 |
Family
ID=31196916
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE2003/002667 WO2004014547A1 (de) | 2002-08-05 | 2003-08-05 | Verfahren zur thermischen behandlung von kieselgur,thermisch behandelte kieselgur und verwendung einer derartigen kieselgur. |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2003263128A1 (de) |
DE (2) | DE10235866B4 (de) |
WO (1) | WO2004014547A1 (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2346981A4 (de) * | 2008-10-09 | 2015-07-01 | Imerys Filtration Minerals Inc | Kieselgurprodukte, herstellungsverfahren dafür und ihre verwendung |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55136117A (en) * | 1979-04-11 | 1980-10-23 | Asahi Chem Ind Co Ltd | Manufacture of tobermorite type fibrous mineral material |
JPS5645818A (en) * | 1979-09-18 | 1981-04-25 | Asahi Chem Ind Co Ltd | Xonotlite fibrous mineral material and its manufacture |
JPH01298051A (ja) * | 1988-05-26 | 1989-12-01 | Osaka Packing Seizosho:Kk | 珪酸カルシウム成形体の製造法 |
US5179062A (en) * | 1990-06-20 | 1993-01-12 | Pascal Dufour | Process for the production of highly permeable calcined diatomites with low cristobalite content and resultant calcined diatomaceous filtration agents |
DE4440931A1 (de) * | 1993-11-19 | 1995-05-24 | Ceca Sa | Neues Filtermittel aus Kieselgur mit kontrollierbarer Permeabilität |
EP0790070A1 (de) * | 1996-02-16 | 1997-08-20 | Advanced Minerals Corporation | Verbundfiltermedien |
US5750038A (en) * | 1994-01-17 | 1998-05-12 | Japan As Represented By Director General Of Agency Of Industrial Science And Technology | Method for the preparation of acid-resistant calcium silicate |
DE19833405A1 (de) * | 1998-07-24 | 2000-02-03 | Stadler Johann | Verfahren zur Verwendung von Kieselgur zur Filtration |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DD266034A1 (de) * | 1987-11-16 | 1989-03-22 | Wtoez Brau & Malzind | Verfahren zum dispersen, strukturbewahrenden korngroessensichernden kalzinieren von kieselgur |
-
2002
- 2002-08-05 DE DE2002135866 patent/DE10235866B4/de not_active Expired - Lifetime
-
2003
- 2003-08-05 DE DE10393548T patent/DE10393548D2/de not_active Expired - Fee Related
- 2003-08-05 AU AU2003263128A patent/AU2003263128A1/en not_active Abandoned
- 2003-08-05 WO PCT/DE2003/002667 patent/WO2004014547A1/de not_active Application Discontinuation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS55136117A (en) * | 1979-04-11 | 1980-10-23 | Asahi Chem Ind Co Ltd | Manufacture of tobermorite type fibrous mineral material |
JPS5645818A (en) * | 1979-09-18 | 1981-04-25 | Asahi Chem Ind Co Ltd | Xonotlite fibrous mineral material and its manufacture |
JPH01298051A (ja) * | 1988-05-26 | 1989-12-01 | Osaka Packing Seizosho:Kk | 珪酸カルシウム成形体の製造法 |
US5179062A (en) * | 1990-06-20 | 1993-01-12 | Pascal Dufour | Process for the production of highly permeable calcined diatomites with low cristobalite content and resultant calcined diatomaceous filtration agents |
DE4440931A1 (de) * | 1993-11-19 | 1995-05-24 | Ceca Sa | Neues Filtermittel aus Kieselgur mit kontrollierbarer Permeabilität |
US5750038A (en) * | 1994-01-17 | 1998-05-12 | Japan As Represented By Director General Of Agency Of Industrial Science And Technology | Method for the preparation of acid-resistant calcium silicate |
EP0790070A1 (de) * | 1996-02-16 | 1997-08-20 | Advanced Minerals Corporation | Verbundfiltermedien |
DE19833405A1 (de) * | 1998-07-24 | 2000-02-03 | Stadler Johann | Verfahren zur Verwendung von Kieselgur zur Filtration |
Non-Patent Citations (3)
Title |
---|
DATABASE WPI Section Ch Week 198049, Derwent World Patents Index; Class L02, AN 1980-87302C, XP002264028 * |
DATABASE WPI Section Ch Week 198124, Derwent World Patents Index; Class E33, AN 1981-43125D, XP002264029 * |
DATABASE WPI Section Ch Week 199003, Derwent World Patents Index; Class E33, AN 1990-018610, XP002264030 * |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2346981A4 (de) * | 2008-10-09 | 2015-07-01 | Imerys Filtration Minerals Inc | Kieselgurprodukte, herstellungsverfahren dafür und ihre verwendung |
EP3059010A1 (de) * | 2008-10-09 | 2016-08-24 | Imerys Filtration Minerals, Inc. | Kieselerdprodukte, verfahren zur herstellung davon und verfahren zu deren verwendung |
Also Published As
Publication number | Publication date |
---|---|
AU2003263128A8 (en) | 2004-02-25 |
WO2004014547A8 (de) | 2004-04-22 |
DE10235866A1 (de) | 2004-03-04 |
DE10393548D2 (de) | 2005-06-30 |
DE10235866B4 (de) | 2005-02-24 |
AU2003263128A1 (en) | 2004-02-25 |
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