CN105236779A - Method for producing gypsum powder by drying and calcining citric gypsum by natural gas - Google Patents
Method for producing gypsum powder by drying and calcining citric gypsum by natural gas Download PDFInfo
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- CN105236779A CN105236779A CN201510725738.9A CN201510725738A CN105236779A CN 105236779 A CN105236779 A CN 105236779A CN 201510725738 A CN201510725738 A CN 201510725738A CN 105236779 A CN105236779 A CN 105236779A
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Abstract
The invention discloses a method for producing gypsum powder by drying and calcining citric gypsum by natural gas. The method comprises: raw material preparation; drying; calcining; grinding; aging; and packaging. The used raw materials are citric gypsum which is washed by flush water, naturally piled and homogenized. The process provided by the invention carries out comprehensive treatment and recycling on solid waste citric gypsum in the citric acid industry, so that the purpose of turning waste into wealth is achieved. Meanwhile, by using natural gas as a heat source of calcining and drying, not only are a series of environmental-friendly problems caused by fire coal reduced, but also the whole production process is free of discharge of soot and sulfur dioxide. The clean level of an enterprise is improved, the heat generated by the natural gas heat source is further fully utilized for direct drying, and the heat loss caused by heat exchange is avoided.
Description
Technical field
The present invention relates to a kind of method utilizing Sweet natural gas to dry calcining citric acid gypsum production terra alba.
Background technology
Citric acid gypsum produces in citric acid process, utilizes a kind of industrial residue produced during sulfuric acid solution.Its main component is terra alba, and content reaches more than 95%, also has the impurity such as silicon-dioxide, aluminium sesquioxide, magnesium oxide in addition, adheres to the free-water of about 40% in addition.Citric acid gypsum is due to containing certain remnants acid and organism (mycelium), and make the semi-hydrated gypsum low strength produced, time of coagulation is elongated, utilizes difficulty, can not get effectively utilization and bulk deposition for a long time to environment.The common practice that current most enterprises adopts is that expropriation of land or leased land temporarily store or landfill, not only take a large amount of arable land, waste resource, and fundamentally thoroughly do not solve solid waste pollution problem, pile up like a mountain to cause solid waste, forms a kind of novel white pollution or gray pollution.Citric acid gypsum seems a kind of solid waste, is a kind of very valuable building resource actually, if correctly utilize in addition, comprehensive exploitation, will turn waste into wealth.
At present, mostly the terra alba on market is to be that raw material calcining forms with the plaster of paris, is mainly used in the fields such as plasterboard, plaster line, gypsum block.In recent years, along with the develop rapidly of building field, plaster of paris development of resources is serious, has even arrived deficient stage, and country has also put into effect relevant policies protection Mineral resources.Therefore, from application prospect, chemical gypsum will replace the plaster of paris, become a kind of novel material of construction.From the detected result to citric acid gypsum, its whiteness, grade are much better than phosphogypsum and desulfurated plaster, and can match in excellence or beauty with the plaster of paris, processability is excellent.
When drying citric acid gypsum, generally adopt warm air dry, warm air be usually all by with other thermal source heat exchanges, a large amount of heats is wasted when heat exchange, and complex process, simultaneously, citric acid gypsum is when calcining, usually all adopt coal to calcine, but coal combustion value is lower, the less calories produced, calcination time is longer, and coal creates a large amount of oxysulfides when burning, and causes topsoil.
Summary of the invention
For the problems referred to above, when the invention provides a kind of oven dry, wasted heat is less, technique is simple, calcination efficiency is high, free of contamination utilize Sweet natural gas to dry method that calcining citric acid gypsum produces terra alba.
The technical solution used in the present invention is:
Utilize Sweet natural gas to dry a method for calcining citric acid gypsum production terra alba, it is characterized in that, comprise the following steps:
(1) raw material prepares: first citric acid gypsum carries out bath washing, and then through the stacking homogenizing of 1-3 month, this homogenization process is the dual homogenizing of physics and chemistry, and the citric acid gypsum stacking homogenizing good is delivered to airflow dryer;
(2) dry: airflow dryer is communicated with natural gas heating resource, and the heat utilizing natural gas heating resource to carry is dried;
(3) calcine: the material of being dried by airflow dryer is sent into use in the calcining furnace of natural gas heating resource and carried out continuous calcining;
(4) grinding: the material calcined is sent into ball mill and carried out milled processed;
(5) ageing: ground material is sent in seal silo through lift and carried out ripening;
(6) pack; Material after seal silo ageing is packed.
As preferably, in described step (3) during calcining, in calcining furnace, the temperature of material raises gradually when calcining, and through 25-40 minute, the temperature of material reaches 170-200 DEG C, completes calcining.
As preferably, the fineness of materials that described step (4) grinding obtains is less than 100 orders.
As preferably, in described step (5), the time of ageing is no less than 72 hours.
Citric acid gypsum raw material of the present invention is fine particulate, this raw material is the one of chemical gypsum, its performance of the terra alba produced by citric acid gypsum is much better than to adopt desulfurated plaster, phosphogypsum, and substantially suitable with the plaster of paris, the alternative plaster of paris uses.
Adopt above-mentioned technique, first citric acid gypsum carries out bath washing, can remove portion objectionable impurities and organism by a large amount of flushings of water, improve material pH value, through the stacking homogenizing of 1-3 month, this homogenization process is the dual homogenizing of physics and chemistry, because in the early stage because water ratio is high, extremely difficult, but through stacking field physics homogenizing, due to water loss, thus its attached water content is made to be reduced to 14-18%; Degradation in stacking also can remove portion objectionable impurities and organism, improves material pH value, and the pH value after homogenizing degraded is 5-7.Chemistry homogenization process can homogenized crystals proterties, makes the semi-hydrated gypsum in citric acid gypsum be converted into dihydrate gypsum, makes raw material homogenization, avoid in production process, occurring part material burning or underburnt phenomenon, improve the performance of finished product, make that it is of high grade, whiteness good, facilitate next step process.If raw material is without homogenizing process, because attached water content is high, the reasons such as crystal composition is unstable cause energy consumption in next step drying course higher, and output is limited, and the final product performance obtained are also unstable.
Adopt Sweet natural gas as thermal source according to calcining, produce the obnoxious flavoures such as oxysulfide hardly after combustion of natural gas simultaneously, by the hot gas be communicated with natural gas heating resource, material is dried, can not the obnoxious flavoures such as oxysulfide be increased in material, simultaneously, also a large amount of heat energy can not be wasted because of heat exchange, drying efficiency is high, effective, because gypsum raw material is through homogenizing process, water content is lower, be applicable to adopt airflow dryer flash baking, citric acid gypsum is different from the plaster of paris, desulfurated plaster and phosphogypsum, its crystal water removes speed slowly, therefore, material is needed to heat up gradually, slowly remove crystal water, after 25-40 minute, temperature of charge reaches 170-200 DEG C, now namely complete the calcining to material, there will not be the phenomenon of underburnt or burning, the terra alba quality obtained is better.
Shredder grinding sent into by material after calcination processing, to promote its processability and product properties, ground material is sent into seal silo and is carried out ripening, because the terra alba calcined is mixed phase, other phase components that inevitable existence is a small amount of, thus affect the performance of finished product, after ageing, some bad components such as dihydrate gypsum and dehydrated gyp-can change into semi-hydrated gypsum, thus improve finished product performance, and the feed bin of sealing can prevent the moisture in air from contacting with material, reduce the quality of material.Digestion time at least needs 72 hours, and the terra alba Nature comparison after ageing is stablized, and quality is better.The material that ageing is good carries out when needs dispatch from the factory packing.
The invention provides a kind of method utilizing Sweet natural gas to dry calcining citric acid gypsum production terra alba, this technique comprises raw material preparation, oven dry, calcining, grinding, ageing, packaging, and the raw material adopted is the citric acid gypsum after bath washing, naturally stacking, homogenizing.This invented technology carries out comprehensive treating process recycling to citric acid industry solid waste citric acid gypsum, reaches the object turned waste into wealth; Simultaneously, utilize Sweet natural gas as the thermal source calcined and dry, not only reduce the coal-fired a series of environmental issues brought, make whole production process smoke dust, sulfur dioxide emissions, what improve enterprise cleans level, also take full advantage of the heat that natural gas heating resource produces, directly dry, calorific loss can not be caused because of heat exchange.
Embodiment
Below by specific embodiment, the present invention is described in further detail.
Embodiment 1
(1) first citric acid gypsum raw material is carried out bath washing, then through the stacking homogenizing of 1 month, the citric acid gypsum stacking homogenizing good is delivered to airflow dryer;
(2) airflow dryer is communicated with natural gas heating resource, and the heat utilizing natural gas heating resource to carry is dried material;
(3) the material feeding of being dried by airflow dryer uses in the calcining furnace of natural gas heating resource carries out continuous calcining, and in calcining furnace, the temperature of material raises gradually when calcining, and through 25 minutes, the temperature of material reached 170 DEG C, completes calcining;
(4) material calcined is sent into ball mill and is carried out milled processed, and the fineness of materials obtained is 100 orders;
(5) ground material is sent in seal silo through lift and is carried out ripening, and the time of ageing is 72 hours;
(6) material after seal silo ageing is packed.
The finished product terra alba index obtained: standard consistency: 72%, presetting period 7min, final setting time 9min, 2h folding strength 2.3MPa, 2h ultimate compression strength 3.5MPa.
Embodiment 2
(1) first citric acid gypsum raw material is carried out bath washing, then through the stacking homogenizing of 2 months, the citric acid gypsum stacking homogenizing good is delivered to airflow dryer;
(2) airflow dryer is communicated with natural gas heating resource, and the heat utilizing natural gas heating resource to carry is dried material;
(3) the material feeding of being dried by airflow dryer uses in the calcining furnace of natural gas heating resource carries out continuous calcining, and in calcining furnace, the temperature of material raises gradually when calcining, and through 33 minutes, the temperature of material reached 185 DEG C, completes calcining;
(4) material calcined is sent into ball mill and is carried out milled processed, and the fineness of materials obtained is 90 orders;
(5) ground material is sent in seal silo through lift and is carried out ripening, and the time of ageing is 4 days;
(6) material after seal silo ageing is packed.
The finished product terra alba index obtained: standard consistency: 74%, presetting period 5min, final setting time 7min, 2h folding strength 2.5MPa, 2h ultimate compression strength 3.8MPa.
Embodiment 3
(1) first citric acid gypsum raw material is carried out bath washing, then through the stacking homogenizing of 3 months, the citric acid gypsum stacking homogenizing good is delivered to airflow dryer;
(2) airflow dryer is communicated with natural gas heating resource, and the heat utilizing natural gas heating resource to carry is dried material;
(3) the material feeding of being dried by airflow dryer uses in the calcining furnace of natural gas heating resource carries out continuous calcining, and in calcining furnace, the temperature of material raises gradually when calcining, and through 40 minutes, the temperature of material reached 200 DEG C, completes calcining;
(4) material calcined is sent into ball mill and is carried out milled processed, and the fineness of materials obtained is 80 orders;
(5) ground material is sent in seal silo through lift and is carried out ripening, and the time of ageing is 4 days;
(6) material after seal silo ageing is packed.
The finished product terra alba index obtained: standard consistency: 75%, presetting period 6min, final setting time 8min, 2h folding strength 2.7MPa, 2h ultimate compression strength 4.4MPa.
Claims (4)
1. utilize Sweet natural gas to dry a method for calcining citric acid gypsum production terra alba, it is characterized in that, comprise the following steps:
(1) raw material prepares: first citric acid gypsum carries out bath washing, and then through the stacking homogenizing of 1-3 month, this homogenization process is the dual homogenizing of physics and chemistry, and the citric acid gypsum stacking homogenizing good is delivered to airflow dryer;
(2) dry: airflow dryer is communicated with natural gas heating resource, and the heat utilizing natural gas heating resource to carry is dried;
(3) calcine: the material of being dried by airflow dryer is sent into use in the calcining furnace of natural gas heating resource and carried out continuous calcining;
(4) grinding: the material calcined is sent into ball mill and carried out milled processed;
(5) ageing: ground material is sent in seal silo through lift and carried out ripening;
(6) pack; Material after seal silo ageing is packed.
2. the method utilizing Sweet natural gas to dry calcining citric acid gypsum production terra alba according to claim 1, it is characterized in that, in described step (3) during calcining, in calcining furnace, the temperature of material raises gradually when calcining, through 25-40 minute, the temperature of material reaches 170-200 DEG C, completes calcining.
3. the method utilizing Sweet natural gas to dry calcining citric acid gypsum production terra alba according to claim 1 and 2, it is characterized in that, the fineness of materials that described step (4) grinding obtains is less than 100 orders.
4. the method utilizing Sweet natural gas to dry calcining citric acid gypsum production terra alba according to claim 3, it is characterized in that, in described step (5), the time of ageing is no less than 72 hours.
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| CN201510725738.9A CN105236779A (en) | 2015-10-29 | 2015-10-29 | Method for producing gypsum powder by drying and calcining citric gypsum by natural gas |
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| CN201510725738.9A CN105236779A (en) | 2015-10-29 | 2015-10-29 | Method for producing gypsum powder by drying and calcining citric gypsum by natural gas |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948548A (en) * | 2016-05-13 | 2016-09-21 | 贵州开磷磷石膏综合利用有限公司 | Preparation method of ultrafine active beta gypsum micro-powder material |
| CN113184891A (en) * | 2021-04-16 | 2021-07-30 | 莱芜泰禾生化有限公司 | Production method of citric acid gypsum |
| CN114213044A (en) * | 2021-12-31 | 2022-03-22 | 镇江吉邦材料科技有限公司 | Desulfurization gypsum calcining process using natural gas as heat source |
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| CN101121587A (en) * | 2007-07-13 | 2008-02-13 | 肥城润东建材有限公司 | Render gypsum |
| CN101798194A (en) * | 2010-02-08 | 2010-08-11 | 日照金禾生化集团有限公司 | Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster |
| CN102807334A (en) * | 2011-06-02 | 2012-12-05 | 北新集团建材股份有限公司 | Control system of natural gas for calcining desulfurized gypsum |
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2015
- 2015-10-29 CN CN201510725738.9A patent/CN105236779A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101121587A (en) * | 2007-07-13 | 2008-02-13 | 肥城润东建材有限公司 | Render gypsum |
| CN101798194A (en) * | 2010-02-08 | 2010-08-11 | 日照金禾生化集团有限公司 | Four-step method process for controlling production of building plaster in industrial and fully automatic mode by using citric acid plaster |
| CN102807334A (en) * | 2011-06-02 | 2012-12-05 | 北新集团建材股份有限公司 | Control system of natural gas for calcining desulfurized gypsum |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105948548A (en) * | 2016-05-13 | 2016-09-21 | 贵州开磷磷石膏综合利用有限公司 | Preparation method of ultrafine active beta gypsum micro-powder material |
| CN105948548B (en) * | 2016-05-13 | 2018-06-19 | 贵州开磷磷石膏综合利用有限公司 | A kind of preparation method of superfine active β Gypsum Fibrosum micropowder materials |
| CN113184891A (en) * | 2021-04-16 | 2021-07-30 | 莱芜泰禾生化有限公司 | Production method of citric acid gypsum |
| CN114213044A (en) * | 2021-12-31 | 2022-03-22 | 镇江吉邦材料科技有限公司 | Desulfurization gypsum calcining process using natural gas as heat source |
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