GB946872A - Improvements in or relating to the reduction of the alkali content of cement clinker - Google Patents
Improvements in or relating to the reduction of the alkali content of cement clinkerInfo
- Publication number
- GB946872A GB946872A GB440961D GB440961D GB946872A GB 946872 A GB946872 A GB 946872A GB 440961 D GB440961 D GB 440961D GB 440961 D GB440961 D GB 440961D GB 946872 A GB946872 A GB 946872A
- Authority
- GB
- United Kingdom
- Prior art keywords
- cement
- alkali
- dust
- gases
- preheating
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27B—FURNACES, KILNS, OVENS, OR RETORTS IN GENERAL; OPEN SINTERING OR LIKE APPARATUS
- F27B7/00—Rotary-drum furnaces, i.e. horizontal or slightly inclined
- F27B7/20—Details, accessories, or equipment peculiar to rotary-drum furnaces
- F27B7/2016—Arrangements of preheating devices for the charge
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B07—SEPARATING SOLIDS FROM SOLIDS; SORTING
- B07B—SEPARATING SOLIDS FROM SOLIDS BY SIEVING, SCREENING, SIFTING OR BY USING GAS CURRENTS; SEPARATING BY OTHER DRY METHODS APPLICABLE TO BULK MATERIAL, e.g. LOOSE ARTICLES FIT TO BE HANDLED LIKE BULK MATERIAL
- B07B9/00—Combinations of apparatus for screening or sifting or for separating solids from solids using gas currents; General arrangement of plant, e.g. flow sheets
- B07B9/02—Combinations of similar or different apparatus for separating solids from solids using gas currents
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B7/00—Hydraulic cements
- C04B7/36—Manufacture of hydraulic cements in general
- C04B7/60—Methods for eliminating alkali metals or compounds thereof, e.g. from the raw materials or during the burning process; methods for eliminating other harmful components
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Toxicology (AREA)
- Environmental & Geological Engineering (AREA)
- Public Health (AREA)
- Health & Medical Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Waste-Gas Treatment And Other Accessory Devices For Furnaces (AREA)
Abstract
946,872. Preheating cement clinker. POLYSIUS G.m.b.H. Feb. 6, 1961 [March 21, 1960], No. 4409/61. Heading F4B. [Also in Division C1] The content of alkalies, i.e. Na 2 O and K 2 O, in cement clinker is reduced and alkali-rich dusts are recovered in cement kilns operating with exhaust gas temperatures of 100-300‹C., e.g. Lepol travelling grate rotary kiln, by preheating the cement raw material by heat exchange with the hot exhaust gases, from the kiln which are withdrawn from the preheating at a point where their temperature is such that the sublimed alkalies in the gases begin to be deposited as a solid, the dust in the withdrawn gases are extracted, the dust-free gases returned to the preheating and the extracted dust is separated into an alkali-rich fraction used, e.g. as a fertilizer, and an alkali-poor fraction which is mixed with the raw material. The dusts may be separated by a wet method, e.g. by flotation in a solution saturated with alkali. Raw cement is fed via shoot 1 to travelling grate 2 and rotary kiln 5. Hot exhaust gases from 5 are fed to heating chamber 4 and through the cement on 2 to chamber 4<SP>1</SP> which contains dust collectors 6. Gases from 6 pass via trunk 7 to drying chamber 3 and through the cement on 2 to chamber 3<SP>1</SP> where fan 8 feeds a final dust separator 9. The dust collected is taken by conveyer belt 11 to be separated into the two fractions, the alkali poor fraction returning on to grate 2 via shoot 1. Specification 874,818 is referred to.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEK40222A DE1147165B (en) | 1960-03-21 | 1960-03-21 | Process for reducing the alkali content in cement clinker and for obtaining alkali-rich dust from cement burning plants |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB946872A true GB946872A (en) | 1964-01-15 |
Family
ID=7221974
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB440961D Expired GB946872A (en) | 1960-03-21 | 1961-02-06 | Improvements in or relating to the reduction of the alkali content of cement clinker |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT225600B (en) |
| BE (1) | BE600235A (en) |
| DE (1) | DE1147165B (en) |
| GB (1) | GB946872A (en) |
| NL (1) | NL261192A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4018786A1 (en) * | 1990-06-12 | 1991-12-19 | Krupp Polysius Ag | METHOD FOR PURIFYING THE EXHAUST GASES FROM PLANTS FOR PRODUCING CEMENT CLINKER |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1301435B (en) * | 1964-01-28 | 1969-08-21 | Fellner & Ziegler Gmbh | Method and device for preheating raw cement |
| DE3411148A1 (en) * | 1984-03-27 | 1985-10-10 | Dyckerhoff Engineering GmbH, 6200 Wiesbaden | Process for removing volatile heavy metal compounds from the cement clinker process |
| DE10305367A1 (en) * | 2003-02-10 | 2004-08-19 | Polysius Ag | Process and plant for the heat treatment of mineral raw materials |
| CN110882922B (en) * | 2019-12-11 | 2022-03-15 | 安徽聚力粮机科技股份有限公司 | Duplex combined grain cleaning equipment |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE716909C (en) * | 1938-08-17 | 1942-02-03 | E N C I N V Eerste Nl Cement I | Process for the recovery of the dust produced by rotary cement tubes |
| DE1061691B (en) * | 1957-03-15 | 1959-07-16 | Polysius Gmbh | Dedusting device on heat exchangers for drying and preheating of cement-like raw material |
| DE1126306B (en) * | 1959-10-17 | 1962-03-22 | Kloeckner Humboldt Deutz Ag | Process for burning cement raw material that contains alkalis |
-
1960
- 1960-03-21 DE DEK40222A patent/DE1147165B/en active Pending
-
1961
- 1961-02-02 AT AT89161A patent/AT225600B/en active
- 1961-02-06 GB GB440961D patent/GB946872A/en not_active Expired
- 1961-02-14 NL NL261192A patent/NL261192A/xx unknown
- 1961-02-15 BE BE600235A patent/BE600235A/en unknown
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4018786A1 (en) * | 1990-06-12 | 1991-12-19 | Krupp Polysius Ag | METHOD FOR PURIFYING THE EXHAUST GASES FROM PLANTS FOR PRODUCING CEMENT CLINKER |
Also Published As
| Publication number | Publication date |
|---|---|
| BE600235A (en) | 1961-08-16 |
| DE1147165B (en) | 1963-04-11 |
| AT225600B (en) | 1963-01-25 |
| NL261192A (en) | 1964-05-11 |
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