CN1022235C - Process for pretreating raw cement - Google Patents
Process for pretreating raw cement Download PDFInfo
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- CN1022235C CN1022235C CN 89103928 CN89103928A CN1022235C CN 1022235 C CN1022235 C CN 1022235C CN 89103928 CN89103928 CN 89103928 CN 89103928 A CN89103928 A CN 89103928A CN 1022235 C CN1022235 C CN 1022235C
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- cement
- cement slurry
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- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The present invention discloses a process for pretreating raw cement. Lime, water glass, thick pulp liquor and straight cement with the certain amount are firstly added to the raw cement, and water is added to the mixture to be mixed with the mixture in a prewetting machine. Then, the mixture is sent to a disc type balling machine to be made into a raw material ball with the grain size of 3 to 7mm and 30 to 35% of porosity, and the balling time of the raw material ball is 100 seconds. Finally, the raw material ball is steamed for eight hours at the temperature of 70 DEG C by a maintenance tower or naturally cured for more than two days at room temperature. The present invention has the advantages of even moisture distribution of the raw cement ball, even granularity, moderate intensity and low breakage rate.
Description
The invention belongs to the cement slurry pretreatment technology.
Present industrial fluidizing furnace since boiling wind speed and air draft air quantity big, can not adopt pulverized fuel, can only burn granular (3～7mm) coal.Mud must be made ball earlier with the raw material powder and reburns so heat up water in such stove.
But, through to plurality of raw materials batching and adopt the made ball of general balling-up method to go into fluidizing furnace because raw material ball is gone into 1000-1200 ℃ of high temperature of the poly-right contact of stove, in the ball moisture content under this temperature through high-temperature evaporation effusion spheroid, the CaCO under this temperature in the raw material
3The CO that decomposites
2The spheroid of also need overflowing, through test raw material ball this moment if do not possess enough intensity and keep rational porosity and need prior drying can't resist this rupture stress.Cement slurry mature calcined material in fluidizing furnace need stop 15 minutes at least.Raw material ball constantly motion in ebullated bed during this period, being subjected to an interior granular fuel and pellet washes away, this moment, pellet was if adopt common distribution, pellet under this mechanical force of washing away, along with the residence time prolongation sphere diameter of ball in stove diminishes, until powdering.So need preparation not influence the raw material ball toughener of cement baking and octane promoter to resist this destruction.
Usually say the raw material ball with clay ingredient, high temperature resistance burst and wearability quite a lot of relatively but in fluidizing furnace 1000-1200 ℃ of this pellet of calcining down, can not overcome two above-mentioned big shortcomings.
The purpose of this invention is to provide a kind of process for raw cement pretreatment, satisfy the requirement of the required cement slurry of under differing temps calcination of cement clinker.
Process for raw cement pretreatment is: at first cement slurry is added cement slurry amount 2% to 4%(2% the best) lime and cement slurry amount 5% to 10%(10% the best) plain cement.Or at first the cement slurry amount is added cement slurry amount 5% to 10%(8% the best) water glass, or add cement slurry amount 2% to 4%(2% the best) lime and cement slurry amount 8% to 15%(10% the best) the thickened pulp waste liquid; Then, add water and in prewetting machine, mixing.Sending into dribbling balling machine then, to make particle diameter be 3-7mm, and porosity is the cement slurry pellet of 30-35%, and its balling-up time is 100 seconds.At last with cement slurry pellet footpath maintenance tower steam-cured 6 to 10 hours (8 hours the bests) or natural curing at room temperature more than two days under 50 to 90 ℃ of (70 ℃ of the bests) temperature.
The raw material ball performance that the raw material that adopt clay to prepare generally speaking make easily reaches shaft kiln and lepol kiln calcining requirement.But be difficult to the good pellet of processability during the feed proportioning of plasticity differences such as employing bone coal and coal gangue, make pellet after only adding a certain amount of lime, water glass, the mixing of thickened pulp liquid, this kind pellet need not to handle again, can satisfy the production needs of shaft kiln and lepol kiln.
But above-mentioned pellet does not satisfy the requirement of boiling boiler calcining pellet, in cement slurry, add for this reason and also will add a certain amount of octane promoter-plain cement etc. in a certain amount of lime and mix through adding water, balling-up, maintenance is handled can satisfy the requirement of fluidizing furnace at 1000-1200 ℃ of following calcination of cement clinker.
A large amount of evidences, the required pellet of fluidizing furnace baking cement clinker has following performance requriements: particle diameter 3-7mm; The porosity 30-35% of dry bulb; Ultimate compression strength 5kg/ more than the ball; 1000-1200 ℃ of high temperature breakage rate＜10%.
Adopt above-mentioned raw material pretreatment technology: the shaft kiln calcination pellet moisture distribution that makes is even; Granularity is all neat; Porosity reaches 30%; 1000 ℃ of high temperature breakage rate＜10%; Pile up voidage between ball and reach 42%; Pellet intensity is moderate.Adopt the output in the cement mill of this technology to increase 5-10%, hear rate reduces about 6%, and has solved the dust pollution etc. of this operation.
The effect that has obtained industrial residue cement bakings such as comprehensive utilization coal gangue is burnt in the fluidizing furnace examination.
Claims (4)
1, a kind of process for raw cement pretreatment is characterized in that:
At first cement slurry is added the lime of cement slurry amount 2% to 4% and the plain cement of cement slurry amount 5% to 10%;
Or at first cement slurry is added the water glass of cement slurry amount 5% to 10%;
Or at first cement slurry is added the lime of cement slurry amount 2% to 4% and add the thickened pulp waste liquid of cement slurry amount 8% to 15%;
Then, add water and in prewetting machine, mix,
Then, sending into dribbling balling machine, to make particle diameter be 3～7mm, and porosity is 30～35% raw material pellet, and its balling-up time is 100 seconds;
At last, with the cement slurry pellet through maintenance tower steam-cured 6～10 hours or natural curing at room temperature more than two days under 50 ℃ to 90 ℃ temperature.
2, a kind of process for raw cement pretreatment according to claim 1 is characterized in that: at first cement slurry is added the lime of cement slurry amount 2% and the plain cement of raw material amount 10%.
3, a kind of process for raw cement pretreatment according to claim 1 is characterized in that: or at first cement slurry is added the water glass of cement slurry amount 8%.
4, a kind of process for raw cement pretreatment according to claim 1 is characterized in that: the lime and the cement slurry amount 10% thickened pulp waste liquid that add cement slurry amount 2%; Then, add water and in prewetting machine, mixing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89103928 CN1022235C (en) | 1989-06-08 | 1989-06-08 | Process for pretreating raw cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 89103928 CN1022235C (en) | 1989-06-08 | 1989-06-08 | Process for pretreating raw cement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1047848A CN1047848A (en) | 1990-12-19 |
| CN1022235C true CN1022235C (en) | 1993-09-29 |
Family
ID=4855343
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 89103928 Expired - Fee Related CN1022235C (en) | 1989-06-08 | 1989-06-08 | Process for pretreating raw cement |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1022235C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1058688C (en) * | 1997-11-18 | 2000-11-22 | 谷士民 | Additive for cement and preparation process therefor |
| CN101967015A (en) * | 2010-11-05 | 2011-02-09 | 北京泽源兴邦科技有限公司 | Granular spontaneous micro batery sewage treatment agent and preparation method thereof |
| CN101967016A (en) * | 2010-11-05 | 2011-02-09 | 北京泽源兴邦科技有限公司 | Microcell spontaneous sewage treatment agent and preparation method thereof |
-
1989
- 1989-06-08 CN CN 89103928 patent/CN1022235C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1047848A (en) | 1990-12-19 |
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| C14 | Grant of patent or utility model | ||
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| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |