CN104355560A - Production method of alpha-gypsum powder with high strength - Google Patents
Production method of alpha-gypsum powder with high strength Download PDFInfo
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Abstract
The invention relates to a production method of alpha-gypsum powder with high strength. The production method comprises the following steps: (1) mixing phosphogypsum with a dry basis mass content larger than or equal to 95% with water to prepare slurry; (2) adding a crystal modifier in the slurry, and transforming the crystal under the conditions of the temperature of 115-130 DEG C and the pressure of 0.2-0.55 Mpa; (3) dehydrating until the free water mass content is smaller than or equal to 15%, and drying the material at the temperature of 135-150 DEG C, purifying the exhaust gas generated during the drying process, removing the dust, discharging the water vapor after purification and dust removal to the air, after the dust is collected, entering the step (4) to crush and modify the dried material in the step (4); (4) crushing and modifying the dried material, controlling the particle size range after crushing to be 75-125 microns, and screening the material to obtain the alpha-gypsum powder with the high strength and different particle sizes. The production method disclosed by the invention solves the waste discharge problem, protects the environment, implements comprehensive utilization of the resource, is simple in technology, high in strength of the alpha-gypsum powder, and good in quality.
Description
Technical field
The invention belongs to shaping glue gel material to produce and field of environmental improvement, relate to a kind of method that α-high strength gypsum powder produced by phosphogypsum.
Background technology
High strength gypsum powder has higher intensity (can reach 40MPa in 7 days) and degree of compactness, therefore named high strength gypsum.High strength gypsum powder higher-grade gypsum raw material makes, and the main plaster of paris using dihydrate gypsum content more than 85% is raw material at present.In order to the comprehensive utilization realizing resource reduces environmental pollution simultaneously, domestic also beginning gradually produces α-high strength gypsum powder with industrial by-products such as desulfurated plaster, citric acid waste residues or phosphogypsums.But phosphogypsum impurities has larger disadvantageous effect to the generation of semi-hydrated gypsum and index, be difficult to produce qualified α-high strength gypsum, so there be limited evidence currently of is useful produce α-high strength gypsum powder.
The method of current China production α-type high strength gypsum powder mainly contains autoclave method and liquid phase method.Autoclave method adopts dry method steam pressure to dewater fine grinding again, the shortcoming of this method is that energy consumption is large, product performance instability is (because temperature is wayward, part semi-hydrated gypsum is further dehydrated into dehydrated gyp-, the finished product are caused to be mixtures of semi-hydrated gypsum based on αsemiwatergypsum and dihydrate gypsum and dehydrated gyp-), the raw material of adding the employing of this technique is block, dihydrate gypsum dehydration is very incomplete, there is part dihydrate gypsum.This has totally unfavorable impact to the quality of αsemiwatergypsum.
The technical process of liquid phase method production α-type high strength gypsum is advanced, control is accurate, and the obtained α-type gypsum intensity of its production is high, and the coefficient of expansion is little, and made model can copy details exactly.Chinese patent literature CN 102615694A (application number: 201110032778.7) disclose a kind of continous way and utilize chemical gypsum to produce the technique of high-strength α gypsum, it is characterized in that comprising following steps: a, chemical gypsum, water fully to be mixed, form stable question response slip; B, the question response slip of step a to be mixed with additive, carry out after mixing turning brilliant; C, will turn brilliant after slip through centrifugal feeding forming machine, make gypsum product through solidifying, cutting, dry.The advantage of this patent be can continuous seepage, good operational environment, thermal source efficiency is high, constant product quality, raw material rate of utilization are high, production line production capacity is high, it is not strict to require the free water content of raw material; Shortcoming is that the Gypsum slurry after turning crystalline substance is directly used for producing plastering, is difficult to sell as intermediates, is unfavorable for the popularization of applying.
Summary of the invention
For the deficiencies in the prior art, the production method of the present invention's a kind of α-high strength gypsum powder.The method technique is simple, energy consumption is low, product performance are stable.
Technical scheme of the present invention is as follows:
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of butt mass content>=95%, obtained solid materials proportion is 1200 ~ 1400kg/m
3slip;
(2) in the obtained slip of step (1), add the crystal modifier of phosphogypsum quality 1/10000th 3/50000 to ten thousand, 115 ~ 130 DEG C, turn brilliant 1.5 ~ 2.5 hours under 0.2 ~ 0.55MPa condition, described crystal modifier is Citrate trianion and/or alkylsulfonate;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry under 135 ~ 150 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, and after broken, particle size range is between 75 ~ 125 microns, and screening obtains the α-high strength gypsum powder of different-grain diameter.
The present invention choosing is separated meet granularity requirements, the rational material of gradation adjustment directly sends into finished bin, to sell as finished product or as the raw material storage of high-strength powder mix; The macrobead that choosing point obtains is re-started modification, choosing point, until all materials all meet granularity requirements.In step of the present invention (4), after broken, choosing separates the α-high strength gypsum powder of different-grain diameter grade, according to product demand, by the product gradation adjustment of different-grain diameter grade, can obtain the α-high strength gypsum powder product of different gradation.
According to the present invention, preferably, the type of heating that step (2) turns in brilliant process is heat-conducting oil heating, further preferably, first heats thermal oil by high pressure steam, then heats slip with the thermal oil after heating.
According to the present invention, preferably, it is 118 ~ 122 DEG C that step (2) turns brilliant temperature, and turning brilliant pressure is 0.25 ~ 0.4Mpa.
According to the present invention, preferably, step (2) turns pressure in brilliant process and adopts and add compressed-air actuated mode and regulate.
According to the present invention, preferably, when described in step (2), crystal modifier is two kinds of crystal modifiers, its feed postition adopts and adds disposable for a kind of crystal modifier, and another kind of crystal modifier is added by pump according to crystal transformation situation, regulates in real time.
According to the present invention, preferably, in step (4), the α of different-grain diameter-high strength gypsum powder is mixed, obtain the α after corresponding gradation adjustment-high strength gypsum powder product.α-high strength gypsum powder the product obtained after different-grain diameter mixing has different initial sets, final setting time, can carry out flexible mixing preparation according to product needed.
According to the present invention, the hot blast that dehydration and drying course use can derive from the waste hot steam produced in other technological processs.
According to the present invention, preferably, all processing steps can realize increasingly automated in conjunction with control operation in PLC (programmable logic controller).
The present invention's phosphogypsum used is the using waste phosphorus gypsum produced in fertilizer process.
The all processing steps of the present invention all can use existing installation to complete, and not specified processing condition are all by prior art.
The present invention has following advantage and beneficial effect:
1, the present invention is to produce the using waste phosphorus gypsum of fertilizer for raw material, produces high-strength α-terra alba, not only creates economic worth, has more processed the emission problem of waste, protection of the environment, has realized the comprehensive utilization of resource.
2, present invention process is simple, and the high-strength α-terra alba of production has that intensity is high, the measured advantage of matter, and obtaining α-terra alba with the present invention is that the gypsum product that base-material is produced does ultimate compression strength at more than 50Mpa.
3, the present invention turn thermal source in brilliant process can adopt two steps transform, first with steam, thermal oil is heated, with the thermal oil after heating, slip is heated again, turn brilliant process temperature, pressure-stabilisation, turn brilliant ambient stable, add pressurized air outward and regulate pressure, can show according to pressure and turn crystalline substance needs to regulate still internal pressure at any time, thus the conversion of common guarantee crystal is very stable, complete, thorough, further ensure the stable of product index and high-quality.
4, crystal modifier of the present invention can adopt two kinds of feed postition simultaneously, improves on the one hand the handiness of adjustment, it also avoid on the other hand and suddenly stops rear can not driving for a long time and the loss that causes the good slip of first wife " inefficacy " and bring because producing.
5, the tail gas of baking stage generation of the present invention is through udst separation, decreases topsoil on the one hand, reduces product loss on the other hand, improve raw material availability and productivity effect.
6, the present invention is continuous production processes, and can adopt control operation in PLC, production automation degree is high, and with manually few, the accuracy of data is high, and feedback in time, is conducive to the regulation and control of productive capacity.
7, high-strength α-terra alba steady quality of obtaining of the present invention, can require that blending respective additive makes mixing class terra alba according to the difference of the finished product, adjustable extent is large, and index is stablized, and can be applicable to the demand of the multiple high-end plasterings such as ceramic female die, precision casting, gear division.
Embodiment
Below by specific embodiment, technical scheme of the present invention is described further, but institute of the present invention protection domain is not limited thereto.
In embodiment, phosphogypsum used is the by-product in the fertile production process of nitro, and its feature of raw material is crystal formation is flake or needle-like.
Phosphogypsum index is as follows:
In embodiment, all processing steps can realize increasingly automated in conjunction with control operation in PLC (programmable logic controller).
Embodiment 1
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of 5 tons of butt mass content 96%, obtained solid materials proportion is 1200kg/m
3slip;
(2) disposablely in the obtained slip of step (1) add 250g crystal modifier, 115 DEG C, turn brilliant 1.5 hours under 0.2MPa condition, described crystal modifier is Citrate trianion;
Type of heating for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating;
Turn pressure in brilliant process to adopt and add compressed-air actuated mode and regulate;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry 1 hour under 140 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, and choosing separates the material (screen over-size≤3.00%) that granularity is 75 microns, obtains α-high strength gypsum powder.
Get this batch of product and carry out Indexs measure according to building standard JC/T 2038-2010, detected result is as follows:
Embodiment 2
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of 5 tons of butt mass content 95%, obtained solid materials proportion is 1250kg/m
3slip;
(2) in the obtained slip of step (1), add 500g crystal modifier, 118 DEG C, turn brilliant 1.8 hours under 0.3MPa condition, described crystal modifier is alkylsulfonate;
Type of heating for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating;
Turn pressure in brilliant process to adopt and add compressed-air actuated mode and regulate;
The feed postition of crystal modifier is added by pump according to crystal transformation situation, regulates in real time;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry 1 hour under 135 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, choosing separates the material (screen over-size≤3.00%) that granularity is 115 microns, with grain size category be 100 microns (screen over-size≤3.00%) material in mass ratio 1:3 carry out gradation adjustment, obtain α-high strength gypsum powder.
Get this batch of product and carry out Indexs measure according to building standard JC/T 2038-2010, detected result is as follows:
Embodiment 3
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of 5 tons of butt mass content 95%, obtained solid materials proportion is 1300kg/m
3slip;
(2) disposablely in the obtained slip of step (1) add 750g crystal modifier, 122 DEG C, turn brilliant 2 hours under 0.4MPa condition, described crystal modifier is alkylsulfonate;
Type of heating for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating;
Turn pressure in brilliant process to adopt and add compressed-air actuated mode and regulate;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry 1 hour under 145 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, choosing separates the material (screen over-size≤3.00%) that granularity is 125 microns, with grain size category be 110 microns (screen over-size≤3.00%) material in mass ratio 1:5 carry out gradation adjustment, obtain α-high strength gypsum powder.
Get this batch of product and carry out Indexs measure according to building standard JC/T 2038-2010, detected result is as follows:
Embodiment 4
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of 5 tons of butt mass content 97%, obtained solid materials proportion is 1350kg/m
3slip;
(2) in the obtained slip of step (1), add 1000g crystal modifier, 126 DEG C, turn brilliant 2.2 hours under 0.5MPa condition, described crystal modifier is Citrate trianion;
Type of heating for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating;
Turn pressure in brilliant process to adopt and add compressed-air actuated mode and regulate;
The feed postition of crystal modifier is added by pump according to crystal transformation situation, regulates in real time;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry 1 hour under 150 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, choosing separates the material (screen over-size≤3.00%) that granularity is 100 microns, with grain size category be 80 microns (screen over-size≤3.00%) material in mass ratio 1:9 carry out gradation adjustment, obtain α-high strength gypsum powder.
Get this batch of product and carry out Indexs measure according to building standard JC/T 2038-2010, detected result is as follows:
Embodiment 5
A production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of 5 tons of butt mass content 95%, obtained solid materials proportion is 1400kg/m
3slip;
(2) disposablely in the obtained slip of step (1) add 1500g crystal modifier, 122 DEG C, turn brilliant 2.5 hours under 0.4MPa condition, described crystal modifier is alkylsulfonate;
Type of heating for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating;
Turn pressure in brilliant process to adopt and add compressed-air actuated mode and regulate;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry 1 hour under 140 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, choosing separates the material (screen over-size≤3.00%) that granularity is 90 microns, with grain size category be 75 microns (screen over-size≤3.00%) material in mass ratio 1:6 carry out gradation adjustment, obtain α-high strength gypsum powder.
Get this batch of product and carry out Indexs measure according to building standard JC/T 2038-2010, detected result is as follows:
Claims (8)
1. a production method for α-high strength gypsum powder, step is as follows:
(1) mixed with water by the phosphogypsum of butt mass content>=95%, obtained solid materials proportion is 1200 ~ 1400kg/m
3slip;
(2) in the obtained slip of step (1), add the crystal modifier of phosphogypsum quality 1/10000th 3/50000 to ten thousand, 115 ~ 130 DEG C, turn brilliant 1.5 ~ 2.5 hours under 0.2 ~ 0.55MPa condition, described crystal modifier is Citrate trianion and/or alkylsulfonate;
(3) material that step (2) is obtained is taken off to free water mass content≤15%, dry under 135 ~ 150 DEG C of conditions; By the tail gas clean-up dedusting produced in drying course, the steam discharge air after purifying and dedusting, the broken modification of mixing of materials after entering into step (4) after dust collection and drying;
(4) material after step (3) being dried carries out broken modification, and after broken, particle size range is between 75 ~ 125 microns, and screening obtains the α-high strength gypsum powder of different-grain diameter.
2. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, the type of heating that step (2) turns in brilliant process is heat-conducting oil heating.
3. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, the type of heating in step (2) turn brilliant process for first to heat thermal oil by high pressure steam, then heats slip with the thermal oil after heating.
4. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, it is 118 ~ 122 DEG C that step (2) turns brilliant temperature.
5. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, it is 0.25 ~ 0.4Mpa that step (2) turns brilliant pressure.
6. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, step (2) turns pressure in brilliant process and adopts and add compressed-air actuated mode and regulate.
7. the production method of α according to claim 1-high strength gypsum powder, it is characterized in that, when described in step (2), crystal modifier is two kinds of crystal modifiers, its feed postition adopts and adds disposable for a kind of crystal modifier, another kind of crystal modifier is added by pump according to crystal transformation situation, regulates in real time.
8. the production method of α according to claim 1-high strength gypsum powder, is characterized in that, is mixed by the α of different-grain diameter-high strength gypsum powder in step (4), obtains the α-high strength gypsum powder product of corresponding grating.
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