CN103936313B - The technique of building gypsum plaster prepared by a kind of phosphogypsum - Google Patents
The technique of building gypsum plaster prepared by a kind of phosphogypsum Download PDFInfo
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- CN103936313B CN103936313B CN201410192026.0A CN201410192026A CN103936313B CN 103936313 B CN103936313 B CN 103936313B CN 201410192026 A CN201410192026 A CN 201410192026A CN 103936313 B CN103936313 B CN 103936313B
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- phosphogypsum
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Abstract
The invention discloses the technique that building gypsum plaster prepared by a kind of phosphogypsum.This technique be dried by phosphogypsum, levigate, select powder, suspended state dehydration and the process procedure such as appropriate ageing formation.The levigate oven dry of phosphogypsum and dehydration are divided into two relatively independent links by present invention process system, adopt negative-pressure operation, dried powder selection device, suspended state water trap device, aging bunker, dust arrester installation, induced draft fan etc. formed by hotblast stove, feeding device, phosphogypsum fine grinding.This art production process is stablized, and energy-conservation, quality product is high, can realize scale operation.
Description
Technical field
The present invention relates to a kind of Solid state fermentation and utilize technical field, particularly relating to a kind of two-step approach and realize phosphogypsum and dry under suspended state, dewater, prepare the production technique of building gypsum plaster.
Background technology
Phosphogypsum is that phosphoric acid by wet process and Phosphate Fertilizer Industry produce the solid waste of discharging, and its main component is that CaSO4.2H2O(content is more than 90%).Produce the phosphogypsum slag that one ton of phosphoric acid will produce about five tons, China's production of phosphate fertilizer will discharge tens million of tons of phosphogypsums every year, needs a large amount of soils to stack, causes severe contamination simultaneously to environment.Gypsum discharges the environmental protection pressure formed has become one of important restriction factor of Phosphate Fertilizer Industry development.
Phosphogypsum is trade waste, is also valuable resource.After phosphogypsum particle shaping, drying and dewatering process, the gypsum for building powder meeting national standard can be become.This technique eliminates the pollution of the industry by-product gypsums such as phosphogypsum to environment, turns waste into wealth, and also can economize on resources.Therefore, the chemical engineering industry of by-product gypsum and building materials industry can be combined the exploitation of the industry by-product gypsums such as phosphogypsum, accomplish phosphate fertilizer and phosphoric acid etc. industry without waste sludge discharge.
The production of building gypsum plaster has kinds of processes.By type of heating, be divided into indirect heating technique and direct heating technique; By calcined dehydration speed, be divided into calcining process and quick calcining process at a slow speed; By discharge method, batch production process and continuous production processes can be divided into.
Before nineteen sixties, based on the tradition interval frying pan of burning type and outer burning formula rotary kiln slowly.In the later stage in the sixties, technological transformation is carried out to aforesaid device, the seventies, interval frying pan has been developed into continuous frying pan, after the eighties, be developed into again taper frying pan; Rotary kiln also develops into inside burning type calcining from outer burning formula; For promoting the technical progress of building gypsum plaster industry, improving the travelling speed of gypsum building material product production line, having developed again air-flowing type quick calcining process in recent years.As a whole, gypsum calcination technique progressively develops along from intermittent take-off to continuous discharge, from indirect heating to direct heating, from the trend being dewatered at a slow speed fast dewatering.
At present, burn or burn rotary kiln, interval or continuous frying pan and fluidizing furnace etc. in the many employings of medium-sized and small enterprises of China outward and produce, scale is less, and auxiliary facility is unsound, and quality product is stable not, and energy consumption is higher.In recent years, the fluidizing furnace of the independently developed annual output of China more than 100,000 tons, direet-heating type rotary kiln have several and have dropped into production (processing parameter still awaits optimizing).
Summary of the invention
The object of this invention is to provide a kind of technique utilizing phosphogypsum to prepare building gypsum plaster, this technique adopts trade waste as raw material, and technological process is simple, and it is convenient to control, and product performance are superior stable, meet the requirement of standard GB/T 9776-2008 completely.
The object of the invention to solve the technical problems realizes by the following technical solutions.The technique of building gypsum plaster prepared by the phosphogypsum that utilizes proposed according to the present invention, comprises the following steps:
A. the feeding of phosphogypsum raw material: phosphogypsum raw material quantitatively feeds feed chute by special feeding machine;
B. dry and the thermal source that dewaters: adopt hotblast stove to provide gas thermal source, gas temperature controls at 350 DEG C ~ 600 DEG C;
C. phosphogypsum drying, fine grinding, select powder: phosphogypsum raw material has concentrated Granular composite, levigate, dry and classification process in Vertical Mill device, the dusty gas that Vertical Mill device is discharged enters cyclonic separator, realize gas solid separation, airflow temperature-control is at 90 DEG C ~ 140 DEG C; The intermediate material going out Vertical Mill device is dihydrate gypsum, and free water content is less than 5%; After described dusty gas is gathered dust by dust-precipitator, discharge through induced draft fan;
D. the suspended state dehydration of phosphogypsum: dried intermediate material enters the dehydration of suspended state dehydration furnace, and the temperature out of dehydration furnace controls at 160 DEG C ~ 230 DEG C; Then through cyclonic separator gas solid separation, the principal goods of collection material is semi-hydrated gypsum powder mutually, and total water content controls 3% ~ 10%; Gas enters Vertical Mill device, is used as the part of heat energy of drying.
E. ageing: collect the semi-hydrated gypsum powder obtained and send in aging bunker, ageing 1 ~ 5 day, namely becomes building gypsum plaster.Products obtained therefrom reaches the requirement of the national standard GB/T 9776-2008 of industrial building gypsum plaster.
The object of the invention to solve the technical problems also can be applied to the following technical measures to achieve further.
Described phosphogypsum raw material can be industry byproduct gypsum or the plaster of paris such as fluorgypsum or other type gypsum.CaSO in various raw material
4.2H
2the content of O is 60% ~ 100%, SiO
2content is 0% ~ 30%.
In described processing step B, hotblast stove can be coal-fired, combustion gas or the fuel oil type of furnace, also can without hotblast stove, utilizes high-temperature tail gas that other commercial runs are discharged as thermal source.
In described processing step C, the material mean particle size after vertical mill grinding controls within the scope of 15 μm ~ 60 μm.
In described processing step C, dust-precipitator can be belt dust-precipitator or dust precipitator.
Described in processing step C, dehydration furnace adopts material stove outer circulation mode, and its solid circulating rate is controlled.
Process system of the present invention is negative-pressure operation, the device interior Negative Pressure Difference that power resources are formed in induced draft fan.
The method that building gypsum plaster prepared by phosphogypsum of the present invention at least has following advantages:
1) to the exploitation of the industry by-product gypsums such as phosphogypsum, the chemical engineering industry of by-product gypsum and building materials industry can be combined, realize phosphate fertilizer and phosphoric acid etc. industry without waste sludge discharge.
2) in technical process, core procedure C can realize the according to target control of phosphogypsum powder particle level, and Task-size Controlling is convenient.
3), in technical process, the heat and mass transfer process in core procedure C-D is all carry out under suspended state, greatly improves gas-solid condition of transmitting, improves thermo-efficiency and the reaction efficiency of system.The fundamental research in early stage proves that suspended state dehydration can complete rapidly in 15s.
4) waste gas that the temperature of D step discharge is relatively high enters step C to be continued to utilize, and final spent air temperture of discharging, lower than 120 DEG C, significantly reduces with conventional dehydration technique phase specific fuel consumption.
5) this technique adopts modern scientist means to carry out the control of temperature and flow, and level of automation is high, and product performance are stablized, and are easy to organize production on a large scale.
Accompanying drawing explanation
Fig. 1 is process schematic representation of the present invention, and the dotted line with arrow in figure represents airflow route, and the solid line of band arrow represents material route map.1. feed system; 2. hotblast stove; 3. Vertical Mill device; 4. dehydration furnace; 5. finished product bin; 6. centrifugal blower; T1 is 450 DEG C; T2 is 180 DEG C; T3 is 110 DEG C.
Embodiment
For further setting forth the technique means that the present invention takes for reaching predetermined goal of the invention, below in conjunction with accompanying drawing and preferred embodiment, the technique being prepared by the two-step approach phosphogypsum proposed according to the present invention to building gypsum plaster is described further.
Concrete technical scheme of the present invention is as follows:
Present invention process system is negative-pressure operation, the device interior Negative Pressure Difference that power resources are formed in induced draft fan.Be made up of drawing-in device, Vertical Mill device, suspended state dehydration reaction stove, aging bunker and dust arrester installation etc., comprise following processing step:
A: the feeding of phosphogypsum raw material.Phosphogypsum raw material is quantitatively fed the feed chute in step C by special feeding machine.According to industrial scale, the specification of feeding machine can be 300 ~ 6000t/d (ton/sky).
B: dry and dehydration thermal source.Hotblast stove is adopted to provide gas thermal source for C and D step.One preferably temperature control embodiment be that gas temperature controls within the scope of 450 ± 20 DEG C.
C: drying, the fine grinding of phosphogypsum, select powder.Phosphogypsum raw material has concentrated Granular composite, levigate, dry and classification process in Vertical Mill device.One preferably temperature control parameter be Vertical Mill discharge dust-contained airflow temperature control, within the scope of 110 ± 10 DEG C, to enter cyclonic separator, realize gas solid separation.The intermediate material going out Vertical Mill is dihydrate gypsum, and free water content is less than 3%.Gas enters after dust-precipitator gathers dust, and discharges through induced draft fan.
D: the suspended state dehydration of phosphogypsum.Dried phosphogypsum powder enters the dehydration of suspended state dehydration furnace, one preferably embodiment be that the temperature out of dehydration furnace controls at 190 ± 10 DEG C.By cyclonic separator gas solid separation, the principal goods of collection material is semi-hydrated gypsum powder mutually, and under preferably embodiment, material total water content controls within the scope of 4%-6%.Gas enters Vertical Mill device, is used as the part of heat energy of drying.
E: collect the semi-hydrated gypsum powder that obtains and enter in aging bunker, one preferably embodiment be through the ageing of 2 ~ 3 days, namely become building gypsum plaster, reach the requirement of the national standard GB/T 9776-2008 of industrial building gypsum plaster.
In processing step C of the present invention, the grinding fineness of phosphogypsum material and select the parameters such as powder fineness adjustable according to processing requirement.One preferably embodiment be that the median size of terra alba controls at 15 μm ~ 40 μm.
In processing step D of the present invention, the dehydration temperaturre of phosphogypsum material is adjustable according to processing requirement.
In technical process of the present invention, systematic air flow, system are that device interior sectional wind velocity is adjustable, and regulative mode can for pipeline being arranged valve or adopting frequency control way to induced draft fan.
In processing step D of the present invention, phosphogypsum suspended state reactor adopts material stove outer circulation mode, and its solid circulating rate is controlled.One preferably embodiment be that internal circulating load controls about 10%.
In technical process of the present invention, the air-flow entering step C can be step D expellant gas, also can be the gas mixture of the high-temperature gas that step D and hotblast stove are discharged, and can be carried out the configuration of gas flow by the valve in respective line.One preferably embodiment be the thermal requirement that effective heat content that gas mixture carries meets phosphogypsum drying, step C expellant gas temperature is maintained in the scope of 110 ± 10 DEG C.
The above, it is only preferred embodiment of the present invention, not any pro forma restriction is done to the present invention, although the present invention discloses as above with preferred embodiment, but and be not used to limit the present invention, any those skilled in the art, do not departing within the scope of technical solution of the present invention, make a little change when the technology contents of above-mentioned announcement can be utilized or be modified to the Equivalent embodiments of equivalent variations, in every case be do not depart from technical solution of the present invention content, according to any simple modification that technical spirit of the present invention is done above embodiment, equivalent variations and modification, all still belong in the scope of technical solution of the present invention.
Claims (9)
1. a technique for building gypsum plaster prepared by phosphogypsum, it is characterized in that it comprises the following steps:
A. the feeding of phosphogypsum raw material: phosphogypsum raw material quantitatively feeds feed chute by special feeding machine;
B. dry and the thermal source that dewaters: adopt hotblast stove to provide gas thermal source, gas temperature controls at 350 DEG C-600 DEG C;
C. phosphogypsum oven dry, fine grinding, select powder: phosphogypsum raw material concentrated in Vertical Mill device Granular composite, levigate, dry and classification process, the dusty gas that Vertical Mill device is discharged enters cyclonic separator, realize gas solid separation, airflow temperature-control is at 90 DEG C-140 DEG C; The intermediate material going out Vertical Mill device is dihydrate gypsum, and free water content is less than 5%; After described dusty gas is gathered dust by dust-precipitator, discharge through induced draft fan;
D. the suspended state dehydration of phosphogypsum: the intermediate material after oven dry enters the dehydration of suspended state dehydration furnace, and the temperature out of dehydration furnace controls at 160 DEG C-230 DEG C; Then through cyclonic separator gas solid separation, the principal goods of collection material is semi-hydrated gypsum powder mutually, and total water content controls at 3%-10%; Gas enters Vertical Mill device, is used as the part of heat energy of drying;
E. ageing: collect the semi-hydrated gypsum powder obtained and send in aging bunker, ageing 1-5 days, namely becomes building gypsum plaster.
2. the technique of building gypsum plaster prepared by phosphogypsum according to claim 1, and its process scale is 300-5000t/d (ton/sky) output.
3. the technique of building gypsum plaster prepared by phosphogypsum according to claim 1, it is characterized in that CaSO in described phosphogypsum raw material
42H
2the content of O is 60%-100%, SiO
2content is 0%-30%.
4. the technique of building gypsum plaster prepared by phosphogypsum according to claim 1, it is characterized in that in described processing step B, and hotblast stove is fire coal, combustion gas or the fuel oil type of furnace.
5. prepare the technique of building gypsum plaster according to the phosphogypsum described in claim 1, it is characterized in that, in processing step C, the material mean particle size after Vertical Mill fine grinding controls within the scope of 15 μm-60 μm.
6. prepare the technique of building gypsum plaster according to the phosphogypsum described in claim 1, it is characterized in that, in processing step C, dust-precipitator is belt dust-precipitator or dust precipitator.
7. prepare the technique of building gypsum plaster according to the phosphogypsum described in claim 1, it is characterized in that, in processing step D, dehydration furnace adopts material stove outer circulation mode, and its solid circulating rate is controlled.
8. prepare the technique of building gypsum plaster according to the phosphogypsum described in claim 1, it is characterized in that, in step B, gas temperature controls at 450 ± 20 DEG C; The dust-contained airflow temperature that in step C, Vertical Mill is discharged controls at 110 ± 10 DEG C, and free water content is less than 3%; In step D, the temperature out of dehydration furnace controls at 190 ± 10 DEG C, and material total water content controls at 4%-6%.
9. prepare the technique of building gypsum plaster according to the phosphogypsum described in claim 1, it is characterized in that, in step D, suspended state dehydration furnace adopts material stove outer circulation mode, and its solid circulating rate controls 10%.
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| CN201410192026.0A CN103936313B (en) | 2014-05-08 | 2014-05-08 | The technique of building gypsum plaster prepared by a kind of phosphogypsum |
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| CN201410192026.0A CN103936313B (en) | 2014-05-08 | 2014-05-08 | The technique of building gypsum plaster prepared by a kind of phosphogypsum |
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| CN103936313B true CN103936313B (en) | 2015-09-30 |
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| CN104628275B (en) * | 2015-02-02 | 2017-08-01 | 河南聚能新型建材有限公司 | Ardealite calcination system and its technological process |
| CN105967618A (en) * | 2016-03-29 | 2016-09-28 | 蚌埠华东石膏有限公司 | Insulation building gypsum powder with mosquito-repellent effect and preparation method thereof |
| CN105967732A (en) * | 2016-03-29 | 2016-09-28 | 蚌埠华东石膏有限公司 | Mothproof insulation building gypsum powder with high compressive strength and manufacture method thereof |
| CN106431035B (en) * | 2016-10-14 | 2018-08-03 | 山东先罗新型建材科技开发有限公司 | Device and method for preparing building gypsum from phosphogypsum |
| CN107572847B (en) * | 2017-09-25 | 2020-02-07 | 昆明理工大学 | Reinforced and toughened phosphogypsum and preparation method thereof |
| CN109020281A (en) * | 2018-09-15 | 2018-12-18 | 杨朴 | A kind of building gypsum plaster still kettle production method |
| CN109912245B (en) * | 2019-04-26 | 2024-04-12 | 四川绵竹市盘龙矿物质有限责任公司 | Method and device for co-production of gypsum powder in sulfuric acid production |
| CN110156359B (en) * | 2019-06-17 | 2021-10-19 | 长沙紫宸科技开发有限公司 | Method for preparing building gypsum powder by converting and absorbing phosphogypsum in dry rotary kiln cement plant |
| CN110104973B (en) * | 2019-06-17 | 2024-03-26 | 长沙紫宸科技开发有限公司 | Method and equipment system for preparing building gypsum powder by phosphogypsum in one step |
| CN110218013B (en) * | 2019-06-17 | 2021-12-31 | 长沙紫宸科技开发有限公司 | Method and equipment for producing phosphogypsum building gypsum powder by using improved vertical mill system |
| CN110128040B (en) * | 2019-06-27 | 2023-10-20 | 长沙紫宸科技开发有限公司 | Equipment system for preparing anhydrite powder by large-scale phosphogypsum digestion |
| CN110436875B (en) * | 2019-09-16 | 2022-03-15 | 王安全 | Plaster and preparation system thereof |
| CN110498628A (en) * | 2019-10-07 | 2019-11-26 | 南京凯盛国际工程有限公司 | A kind of anhydrous gypsum preparation system |
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| US4435183A (en) * | 1982-02-16 | 1984-03-06 | United States Gypsum Company | Process for rapid dewatering and drying of calcium sulfate hemihydrate |
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Address after: 550500 Guizhou Province, Qiannan Buyei and Miao Autonomous Prefecture Fuquan Racecourse town Yingbin Road No. 1 Wengfu group Co-patentee after: XI'AN University OF ARCHITECTURE & TECHNOLOGY Patentee after: WENGFU GROUP Co.,Ltd. Address before: 23, 550002 floor, International Building, No. 57, South City Road, Nanming District, Guiyang, Guizhou Co-patentee before: XI'AN University OF ARCHITECTURE & TECHNOLOGY Patentee before: WENGFU GROUP Co.,Ltd. |