CN101152737B - Method for squeezing to produce concrete retardation ball with chemical gypsum - Google Patents
Method for squeezing to produce concrete retardation ball with chemical gypsum Download PDFInfo
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- CN101152737B CN101152737B CN2006101594892A CN200610159489A CN101152737B CN 101152737 B CN101152737 B CN 101152737B CN 2006101594892 A CN2006101594892 A CN 2006101594892A CN 200610159489 A CN200610159489 A CN 200610159489A CN 101152737 B CN101152737 B CN 101152737B
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- chemical gypsum
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Abstract
The present invention discloses a chemical gypsum squeezing and manufacturing cement retarding ball method. The steps are as follows: lime is used to neutralize chemical gypsum until the pH is more than or equal to 7 and is stirred to be even, a modified chemical gypsum is obtained; then the modified chemical gypsum and half water gypsum are mixed and stirred to be even according to the weight proportion from 100 to 6 to 100 to 30. The content of free moisture which controls the mixed material is 5 to 11 percent and the pH is more than or equal to 7; the mixed material is directly pressed to molding. The present invention greatly reduces the dosage of half water gypsum and the production cost of cement retarding ball. The operation environment of factories which use pressing molding is improved. Because the balling making mechanism is changed, the liquid water content of products is greatly reduced, which is propitious to cement production and suitable for large-scale production. Large quantity of chemical gypsum in particular to phosphogypsum is transformed, which reduces pressure of environment.
Description
Technical field
The present invention relates to a kind of technology, relate in particular to a kind of with chemical gypsum and lime CaO, Ca (OH) with the chemical gypsum produce concrete retardation ball
2Be raw material, the technology of extrusion produce concrete retardation ball.
Background technology
Need to add CaSO in the clinker
42H
2O or CaSO
4Make set retarder to regulate cement setting time, the plaster of paris is the set retarder than high-quality, but plaster of paris resource anxiety not only, price is also higher.In recent years, industry by-product gypsum is that chemical gypsum has replaced the plaster of paris the sixth of the twelve Earthly Branches to a certain extent, but chemical gypsum is the powder shape material that contains certain free water and free acid substantially, must use the lime neutralisation treatment, and must make the block of certain specification, with convenient evenly blanking in the warehouse (moisture granular material is pressed caking in the warehouse or because of heap, perhaps build bridge greatly because of the absorption affinity between the particle, thereby produce cutout).Adopt like this which kind of technology can be more convenient, cost more produces cement retarder in the lowland, becomes insider's research topic, with the further cost of raw material that reduces manufacture of cement, administers pollution and the harm of chemical gypsum waste residue to environment effectively.
The discarded ardealite of the disclosed usefulness of CN92112246.2 is that the cement retardative that primary raw material is produced strengthens gypsum sphere, and this strengthens the gypsum retardation ball by ardealite slag and lime CaO, Ca (OH)
2By weight 100: 0.5～10 proportion ingredient, stir, in oven dry below 150 ℃, dry by the fire to material moisture be 3～10%, baking back material enters make-up machine, the extruding balling-up.But the cement retarder intensity that this invention is produced is lower, and frangible powdering in transportation, banking process often causes set retarder warehouse caking to stop up or bridge formation, causes evenly blanking of charging system, and this kind retardation ball is refused to use by large-scale cement factory substantially.
CN02138799.0 discloses a kind of with active phosphogypsum and do the application of cement retardative reinforcing agent.The 80-90% ardealite is adopted in this invention; The clay of 2-15%, flyash, cinder or other industrial residue are made adhesiving reinforcing agent; The lime of 3-10%, saltcake, industrial aluminum slag, alum masonry activity excitant are after mixing, being squeezed into brick, again through 600-900 ℃ of temperature calcining 30-60 minute.Because of the brick intensity after the extruding is lower, need a dead lift in rotary kiln, so this method exist production cost height, problem that production scale is little.
CN02138800.8 discloses a kind of upgrading ardealite and has done the application of cement retarder.This invention is the improvement to CN02138799.0, promptly adopts blast-furnace slag, flyash, the slag of 2-15% to make reinforcing agent; The carbide slag of 3-10%, alkaline residue, cement, lime are made modification agent, through stirring and evenly mixing, be squeezed into brick after, air dry is made.Calcination process has been got rid of in this invention, but after must placing an about week, could satisfy loading and unloading requirements on transport, so just storage space that must be bigger.
CN021380880.0 discloses the method for a kind of modified ardealite and preparation thereof.This invention is by the ardealite with modifier modification, carries out sultry processing with solar energy after moulding, or high-temperature calcination.The same with CN02138799.0, exist how to reduce cost, improve production-scale problem.
CN02141721.0 discloses a kind of method and device with the agent of chemical gypsum produce concrete retardation, with thermal current to chemical gypsum in drier predrying after, calcining, ageing make semi-hydrated gypsum in calcinatory, mix through disk granulation balling-up by weight 0.6～1: 1 ratio for neutral or alkaline chemical gypsum with pH value again.Because the semi-hydrated gypsum consumption more will be up to 50% in actual production for the balling technique of this invention, not only production cost is higher relatively, and too much semi-hydrated gypsum consumption causes stock's caking serious; The disk granulation process only relies on the gelatification of semi-hydrated gypsum in addition, and the moisture that causes retardation ball does not meet the requirement in cement plant up to 18%, influences the mill output of cement; Also because the semi-hydrated gypsum large usage quantity, and material is in all the time from high that the production process dust pollution is serious toward the low state of shedding fast, and production environment is abominable.
Summary of the invention
The present invention is improvement and the innovation on the CN02141721.0 basis, and it is that the technology of raw material is simple, production cost is low, production environment is good, the method with squeezing to produce concrete retardation ball with chemical gypsum of low water content with the chemical gypsum that purpose is to provide a kind of.
The present invention has kept CN02141721.0 and has utilized chemical gypsum to prepare cement retarder serialization production, characteristics that production scale is big, and the deficiency of its existence is improved and innovated.Processing step of the present invention is as follows: (1) with in the lime and chemical gypsum to pH 〉=7, and stir, obtain the modified chemical gypsum; (2) gained modified chemical gypsum and semi-hydrated gypsum are pressed 100: 6～30 weight ratio mixing and stirring, control mixed material free water content is 5～11%, pH 〉=7; (3) with the direct extrusion modling of mixed material.
Semi-hydrated gypsum described in the above-mentioned steps (2) can be processed by disclosed method among step (1) the products therefrom employing CN02141721.0.Chemical gypsum described in the step (1) can be the ardealite of the multiple fertile industry discharging of phosphorus or the sulphur gypsum of thermal power generation industry.
The inventor finds in experiment, the volume ratio of semi-hydrated gypsum is crossed the retardation ball undercapacity that low then extruding is come out in the step (2), easily broken in transportation, banking process, cause cement production enterprise normally to prepare burden, along with the volume ratio strengthens, retardation ball intensity will increase gradually, after reaching certain volume ratio, retardation ball intensity begins to increase slowly, but the retardation ball production cost is linear growth with the volume ratio increasing of semi-hydrated gypsum, therefore, the volume ratio of semi-hydrated gypsum of the present invention is preferably 100: 9～15.
The key factor that influences gypsum retardation ball ordinary production in step (3) is the free water content that chemical gypsum and semi-hydrated gypsum mixture are selected in modification, this free water content should be lower than 11%, otherwise material viscosity increases, made retardation ball demoulding difficulty influences serialization production.Because the free water content of ardealite or sulphur gypsum is not higher than 17% usually, therefore the free water content that can more easily control mixture by the volume ratio of selecting semi-hydrated gypsum is lower than 11%.The present invention controls step (2) gained material free water content preferably 8～9%, and this water content not only helps the demoulding of retardation ball, and is also very favourable to manufacture of cement.
The present invention compares with the disclosed chemical gypsum produce concrete retardation ball of CN02141721.0 technology, owing to reduced the semi-hydrated gypsum consumption significantly, thus reduced the production cost of cement retarder; Adopt extrusion modling to substitute existing disk pellet forming process, improved the operating environment of factory; In addition, because nodulizer haircut is given birth to and is changed, the product water content descends significantly, and quality is improved preferably, helps manufacture of cement, and can more easily control the free water content of mixture by the volume ratio of selecting semi-hydrated gypsum, do not need the chemical gypsum raw material is carried out the preliminary treatment dehydration, energy consumption is low, is more suitable for large-scale production, can transform and consume especially ardealite of chemical gypsum in large quantities, alleviate environmental pressure.Specifically relatively see the following form:
| Sequence number | Project | Extrusion process | Existing technology |
| 1 | The retardation ball water content≤ | 10％ | 18％ |
| 2 | The balling-up ambient condition | Better | Dust is bigger |
| 3 | Semi-hydrated gypsum consumption/ton ball | 5-30％ | ≥50％ |
| 4 | Stock's situation of luming | Do not lump | Caking |
The specific embodiment
The technological process of production such as Fig. 1 are as shown.Among the embodiment of the following stated, except that specializing, the ratio of inventory all is meant weight ratio.
Embodiment 1: get a part of ardealite in the ardealite slag field, contain free moisture 15%, pH=3.5, get 3% lime of ardealite quantity of goods produced with accounting for and it mixes, the modified ardealite that obtains is distributed part be processed into half water ardealite, modified ardealite with neutralization stirs again, and the ratio of controlling half water ardealite and modified ardealite is 20: 80; The mixture of two kinds of ardealites is pressed into the phosphogypsum retardation setting ball in the pair roller extruder, after testing: the compression strength on phosphogypsum retardation setting ball same day is 19kg/, and moisture is 9.35%, pH 〉=7; After 3 days, compression strength increases to 41kg/.Meet the quality and the accumulating requirement of cement retarder fully.
Embodiment 2: get a part of ardealite in the ardealite slag field, contain free moisture 16%, pH=3, get 3% lime of ardealite quantity of goods produced with accounting for and it mixes, the modified ardealite that obtains is distributed part be processed into half water ardealite, modified ardealite with neutralization stirs again, and the ratio of controlling half water ardealite and modified ardealite is 30: 70; The mixture of two kinds of ardealites is pressed into the phosphogypsum retardation setting ball in the pair roller extruder, after testing: the compression strength on phosphogypsum retardation setting ball same day is 18kg/, and moisture is 8.1%, pH 〉=7; After 3 days, compression strength increases to 48kg/.Meet the quality and the accumulating requirement of cement retarder fully.
Embodiment 3: get a part of sulphur gypsum in the sulphur gypsum tailings field, contain free moisture 6%, pH=6, get 1% lime of sulphur gypsum quantity of goods produced with accounting for and it mixes, with the modified sulphur gypsum that obtains wherein a part be processed into semi-hydrated gypsum, stir with the modified sulphur gypsum, the ratio of controlling half water sulphur gypsum and modified sulphur gypsum is 6: 94 again; The mixture of two kinds of sulphur gypsum is pressed into sulphur gypsum retardation ball in the pair roller extruder, after testing: the compression strength on gypsum retardation ball same day is 16kg/, and moisture is 5.0%, pH 〉=7; After 3 days, compression strength increases to 38kg/.Meet the quality and the accumulating requirement of cement retarder.
Claims (4)
1. with the method for squeezing to produce concrete retardation ball with chemical gypsum, may further comprise the steps: (1) with in the lime and chemical gypsum to pH 〉=7, and stir, obtain the modified chemical gypsum; (2) gained modified chemical gypsum and semi-hydrated gypsum are pressed 100: 6～30 weight ratio mixing and stirring, control mixed material free water content is 5～11%, pH 〉=7; (3) with the direct extrusion modling of mixed material.
2. method according to claim 1, described chemical gypsum are ardealite or sulphur gypsum.
3. method according to claim 1 and 2, wherein described modified chemical gypsum of step (2) and semi-hydrated gypsum weight ratio are 100: 9～15.
4. method according to claim 1 and 2, wherein resulting modified chemical gypsum of step (2) and semi-hydrated gypsum mixed material free water content are controlled at 8～9%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101594892A CN101152737B (en) | 2006-09-26 | 2006-09-26 | Method for squeezing to produce concrete retardation ball with chemical gypsum |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2006101594892A CN101152737B (en) | 2006-09-26 | 2006-09-26 | Method for squeezing to produce concrete retardation ball with chemical gypsum |
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| Publication Number | Publication Date |
|---|---|
| CN101152737A CN101152737A (en) | 2008-04-02 |
| CN101152737B true CN101152737B (en) | 2011-02-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2006101594892A Expired - Fee Related CN101152737B (en) | 2006-09-26 | 2006-09-26 | Method for squeezing to produce concrete retardation ball with chemical gypsum |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085879A (en) * | 1992-10-16 | 1994-04-27 | 湖北襄樊水泥厂 | Producing cement from phosphor production is with strengthening gypsum sphere |
| CN1389420A (en) * | 2002-07-16 | 2003-01-08 | 武汉理工大学 | Active ardealite and its application as cement reinforcing retardant |
| CN1389421A (en) * | 2002-07-16 | 2003-01-08 | 武汉理工大学 | Denatured ardealite brick and its application as cement retardant |
| CN1394823A (en) * | 2002-08-09 | 2003-02-05 | 孙国庆 | Modified phosphogypsum and its preparation |
| CN1478751A (en) * | 2002-08-30 | 2004-03-03 | 王振海 | Method and device for making cement slow coagulating agent using chemical gypsum |
-
2006
- 2006-09-26 CN CN2006101594892A patent/CN101152737B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1085879A (en) * | 1992-10-16 | 1994-04-27 | 湖北襄樊水泥厂 | Producing cement from phosphor production is with strengthening gypsum sphere |
| CN1389420A (en) * | 2002-07-16 | 2003-01-08 | 武汉理工大学 | Active ardealite and its application as cement reinforcing retardant |
| CN1389421A (en) * | 2002-07-16 | 2003-01-08 | 武汉理工大学 | Denatured ardealite brick and its application as cement retardant |
| CN1394823A (en) * | 2002-08-09 | 2003-02-05 | 孙国庆 | Modified phosphogypsum and its preparation |
| CN1478751A (en) * | 2002-08-30 | 2004-03-03 | 王振海 | Method and device for making cement slow coagulating agent using chemical gypsum |
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| CN101152737A (en) | 2008-04-02 |
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