CN101186454A - Energy-saving drying production method for gypsum - Google Patents
Energy-saving drying production method for gypsum Download PDFInfo
- Publication number
- CN101186454A CN101186454A CNA2007100508875A CN200710050887A CN101186454A CN 101186454 A CN101186454 A CN 101186454A CN A2007100508875 A CNA2007100508875 A CN A2007100508875A CN 200710050887 A CN200710050887 A CN 200710050887A CN 101186454 A CN101186454 A CN 101186454A
- Authority
- CN
- China
- Prior art keywords
- gypsum
- moisture eliminator
- energy
- production method
- temperature
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Compounds Of Alkaline-Earth Elements, Aluminum Or Rare-Earth Metals (AREA)
- Drying Of Solid Materials (AREA)
Abstract
The invention discloses an energy-saving and drying production method for gypsum, which comprises an energy-saving and drying production process by employing two-grade circulation drying method and fully making use of enthalpy produced in temperature difference of striping down free-water and losing of crystal water; then tail gas with high temperature after losing crystal water is used for drying the free water in gypsum and heating the feed material, so as to greatly reduce the temperature of discharged tail gas of production system; by adopting the two-grade drying method to reduce the temperature of discharge tail gas from 160-170 DEG C to 85 to 100 DEG C, energy consumption for drying is saved and production cost is greatly reduced.
Description
Technical field:
The invention belongs to the production method of gypsum, particularly relate to the energy-saving drying production method of gypsum.
Background technology:
Industry by-product gypsum mainly contains at present: phosphogypsum, sulfuric acid method titanium pigment spent acid are handled gypsum or the like.
The generation of phosphogypsum mainly is a wet method phosphorous chemical industry when producing phosphoric acid, and phosphorus ore and sulfuric acid carry out that the replacement(metathesis)reaction precipitated crystal generated, one ton of phosphoric acid (P
2O
5%) to produce 5-6 ton solid phosphogypsum.The about 8,000,000 tons of (P of China's Wet-process Phosphoric Acid Production in 2006
2O
5%), produce more than 4,400 ten thousand tons of solid phosphogypsums.A large amount of dischargings of phosphogypsum not only need the fund of writing and soil to build the stockyard, also since phosphogypsum through the rainwater long period of soaking, titanium pigment wherein, fluorine etc. with the water body be media to the environment transmission, cause soil, water system, atmospheric pollution.
Sulfuric acid method titanium pigment produces sulfur waste acid 6-8 ton (20-25%H
2SO
4), dilute sulphuric acid 60-100 ton (2.0-5.0%H
2SO
4).The contriver is patent of invention ZL02113704.8 once, and " a kind of concentrating and impurity removing production method of dilute sulphuric acid " success has solved the former economically and contained 20-25%H
2SO
4Sulfuric acid reclaims problem; And the latter only can use in the lime and the generation gypsum because concentration is too low.Present domestic sulfuric acid method titanium pigment has reached 1,000,000 tons of years, and the amount of gypsum of generation is up to 3,000,000 tons.Although wherein there is not phosphorus, fluorine etc. in the phosphogypsum to jeopardize the impurity of environment, its stacking will occupy a large amount of soils equally.
Although gypsum should have the market purposes greatly as building consolidating material, cement setting retarder even sulfuric acid cement raw material.But, to remove outside the wherein separable impurity effect, most important reason also is the most basic factor, is the tooling cost of the industry by-product gypsum and the plaster of paris.The generation of phosphogypsum is to filter in the operation at the phosphoric acid of Wet-process Phosphoric Acid Production, through vacuum filter as turn over, filters such as turntable, belt separate and obtain.Wherein contain the free-water of the 25-30% that has an appointment and 20% crystal water, it is higher that the titanium white gypsum contains free-water, and the plaster of paris does not have the free-water of this about 25-30%.This just causes gypsum processing and utilization energy consumption height, and device capability does not increase, and tooling cost is higher than the tooling cost of the plaster of paris.
The drying means of existing gypsum processing building gypsum plaster consolidating material, cement setting retarder and production sulfuric acid cement raw material, as " phosphate fertilizer and multiple fertilizer " magazine the 16th volume the 2nd phase the 59th page to 61 pages " process characteristics of producing cement from phosphor retardant and building gypsum plaster " of delivering, the big remarkable shortcoming of energy consumption when this technology exists final drying to deviate from free-water and crystal water.Owing to will deviate from dihydrate gypsum (CaSO
42H
2O) 1.5 crystal water make it to become semi-hydrated gypsum (CaSO in
41/2H
2O); Theoretically, free-water just can be driven free-water away for 100 ℃ at drying temperature under the normal pressure, and some dry production systems have certain little negative pressure, and its drying temperature can also be lower; And crystal water is just to begin to lose at 128 ℃, allow lose crystal water and reach production requirement, often will maintain between 160-170 ℃ the temperature.This just causes the heat of the warm air under this a large amount of temperature to waste.If the employing counter current drying must be kept 160-170 ℃ hot air source, otherwise exceed this temperature, semi-hydrated gypsum (CaSO
41/2H
2O) will become dehydrated gyp-(CaSO
4); The exsiccant temperature difference (Δ T) is little like this, and thermo-efficiency is low.So the deficiency of the drying and dehydrating of existing phosphogypsum, the plaster of paris and the production method of dehydration is that thermal utilization is low, a large amount of hot air sources of 160-170 ℃ that have are lost in vain; Not only bad for energy-saving and emission-reduction, and cause enterprise's production cost height; It also is the basic place that phosphogypsum is difficult to utilize.
Summary of the invention:
The objective of the invention is in order to overcome the deficiencies in the prior art, a kind of gypsum energy-saving drying method that adopts the two-stage cyclic drying to carry out is provided.Owing to make full use of free-water and the heat content that loses in the crystal water temperature difference, the higher temperatures tail gas that loses crystal water in the gypsum is used for drying the free water content of gypsum and heats feed material, make the eliminating exhaust temperature in the production system drop to 85-100 ℃ by 160-170 ℃; Reached and saved the energy, reduce production costs, improved throughput, reduced investment, increased the producer's purposes such as economic benefit.
The objective of the invention is to be achieved through the following technical solutions: comprise direct gypsum with gypsum, phosphogypsum or the pre-dehydration of purification machinery, add moisture eliminator 1, with the hot blast of moisture eliminator 2 behind product separation as thermal source, in moisture eliminator 1, carry out drying, the material that comes out from moisture eliminator 1 is after gas solid separation, solid materials send moisture eliminator 2 to do charging, the gas emptying; At moisture eliminator 2 usefulness hotblast stoves 4 high-temperature hot-airs as thermal source, moisture eliminator 2, carry out drying with the material of deviating from most of free-water from drying 1 and heated, the material that comes out from moisture eliminator 2 is after gas solid separation, obtaining solid is indication terra alba product of the present invention, and hot blast tail gas loops back moisture eliminator 1 as drying source.Processing method of the present invention comprises:
A, with gypsum or phosphogypsum, as the dried feed charging;
B, enter moisture eliminator 1 oven dry and fall the free-water in most of charging and add thermal material, the high-temperature tail gas of the moisture eliminator 2 that hot blast returns for circulation, hot blast also can be provided by other thermal source 5;
C, the material that comes out from moisture eliminator 1 drying are through gas solid separation; The tail gas emptying, the hot solids material is as the charging of moisture eliminator 2;
D, enter moisture eliminator 2 oven dry and fall crystal water in most of charging, the high-temperature gas that hot blast hotblast stove 4 produces;
E, the material that comes out from moisture eliminator 2 are through gas solid separation; Solid materials is the semi-hydrated gypsum product that obtains; Tail gas loops back moisture eliminator 1 as the exsiccant thermal source.
The temperature out of moisture eliminator 1 is 80-105 ℃ among the present invention, preferably 90-100 ℃; The inlet temperature of moisture eliminator 2 is 400-600 ℃, preferably 500 ℃; Temperature out is 155-180 ℃, preferably 160-170 ℃.The prepared object of the present invention is semi-hydrated gypsum.Can be used for producing the raw material of building jointing compound, cement setting retarder, building plasterboard, building block and gypsum system sulfuric acid cement.
The advantage that technical scheme of the present invention is brought: owing to adopt the two-stage drying, hot air circulation is used again, made full use of and deviate from free-water and the heat content that loses in the crystal water temperature difference, the higher temperatures tail gas that loses crystal water in the gypsum is used for drying the free water content of gypsum and heats feed material, make the eliminating exhaust temperature in the production system drop to 85-100 ℃ by 160-170 ℃.Promptly reached and saved the energy, reduce production costs, enhanced productivity, enlarged the production purposes of gypsum and even industry by-product gypsum again.Energy-saving and emission-reduction, the protection environment has been saved investment and productive expense; And reduced a large amount of industry by-product gypsums the soil produced occupied because of stacking, the construction of slag field, maintenance cost etc.Therefore, the present invention not only can use the depleted industry by-product gypsum as a resource, and has advantages such as the tooling cost expense is low, economic and social benefit is very remarkable.
Description of drawings:
Fig. 1: gypsum energy-saving drying production method schematic flow sheet of the present invention
1, moisture eliminator; 2, moisture eliminator;
3,6 cyclonic separators; 4, hotblast stove;
5, hotblast stove or other thermal source.
Specific embodiment:
Below in conjunction with process flow sheet and with specific embodiment the inventive method is described further.
Embodiment 1:
Will be through the industry by-product gypsum (free-water 12% of purification and mechanical dehydration, crystal water 18%) with in 8000 kilograms of input moisture eliminator 1 of input amount per hour, hot blast (or other thermal source) with hotblast stove 5 carries out drying, free-water in the oven dry gypsum is kept 90 ℃ of moisture eliminator cyclonic separator 3 temperature outs; The thermal material of separating from cyclonic separator 3 enters moisture eliminator 2, and the hot blast that produces with the hotblast stove 4 of moisture eliminator 2 carries out drying and dehydrating, 550 ℃ of moisture eliminator 2 inlet temperatures, 170 ℃ of cyclonic separator 6 temperature outs; The material of separating from cyclonic separator 6 is that the semi-hydrated gypsum product send finished bin to store, be used for the processing of derived product, the dusty gas of separating from cyclonic separator 6 returns moisture eliminator 1 and makes warm air drying and use, reduce the thermal load of moisture eliminator 1 hotblast stove 5 simultaneously, keep thermal equilibrium, material balance, the temperature equilibrium of total system.Per hour obtain 600 kilograms of products.
Embodiment 2:
With in 8000 kilograms of input moisture eliminators 1 of input amount per hour, the hot blast with hotblast stove 5 carries out drying earlier with the plaster of paris (free-water 5%, crystal water 22%), dries the free-water in the gypsum, keeps 90 ℃ of moisture eliminator 1 cyclonic separator 3 temperature outs; The thermal material of separating from cyclonic separator 3 enters moisture eliminator 2, and the hot blast that produces with the hotblast stove 4 of moisture eliminator 2 carries out drying and dehydrating, 600 ℃ of moisture eliminator 2 inlet temperatures, 160 ℃ of cyclonic separator 6 temperature outs; Separating 6 materials that come out from cyclonic separator is that the semi-hydrated gypsum product send finished bin to store, be used for the processing of derived product, the dusty gas of separating from cyclonic separator 6 returns moisture eliminator 1 and makes warm air drying and use, reduce the thermal load of moisture eliminator 1 hotblast stove 5 simultaneously, keep thermal equilibrium, material balance, the temperature equilibrium of total system.Per hour obtain 680 kilograms of products.
Embodiment 3:
With in 8000 kilograms of input moisture eliminators 1 of input amount per hour, the hot blast with hotblast stove 5 carries out drying earlier with phosphogypsum (free-water 25%, crystal water 17%), dries the free-water in the gypsum, keeps 90 ℃ of moisture eliminator 1 cyclonic separator 3 temperature outs; The thermal material of separating from cyclonic separator 3 enters moisture eliminator 2, and the hot blast that produces with the hotblast stove 4 of moisture eliminator 2 carries out drying and dehydrating, 600 ℃ of moisture eliminator 2 inlet temperatures, 180 ℃ of cyclonic separator 6 temperature outs; The material of separating from cyclonic separator 6 is that the semi-hydrated gypsum product send finished bin to store, be used for the processing of derived product, the dusty gas of separating from cyclonic separator 6 returns moisture eliminator 1 and makes warm air drying and use, reduce the thermal load of moisture eliminator 1 hotblast stove 5 simultaneously, keep thermal equilibrium, material balance, the temperature equilibrium of total system.Per hour obtain 520 kilograms of products.
Claims (9)
1. the energy-saving drying production method of gypsum is characterized in that this method comprises:
A, gypsum sent into carry out drying in the moisture eliminator 1;
B, the material that comes out from moisture eliminator 1 carry out gas solid separation, and the solid after the separation is as the charging of moisture eliminator 2, and gas is as the tail gas emptying;
C, the solid materials that moisture eliminator 1 is dry after separating is sent in the moisture eliminator 2, the thermal source with hotblast stove 4 produces carries out drying;
D, the material that comes out from moisture eliminator 2 carry out gas solid separation, and the solid after the separation is the finished product semi-hydrated gypsum, and the elevated temperature heat gas after the separation returns moisture eliminator 1 as the exsiccant thermal source.
2. by the energy-saving drying production method of the described gypsum of claim 1, the gypsum that it is characterized in that described adding can be the plaster of paris, phosphogypsum or phosphogypsum or titanium dioxide waste acid by sulfuric acid process processing gypsum through purifying mechanical dehydration, and even other industrial gypsum.
3. by the energy-saving drying production method of the described gypsum of claim 1, the hot blast source that it is characterized in that described moisture eliminator 1 is the high-temperature tail gas from moisture eliminator 2.
4. by the energy-saving drying production method of the described gypsum of claim 1, the temperature out that it is characterized in that described moisture eliminator 1 is 85-105 ℃.
5. by the energy-saving drying production method of the described gypsum of claim 4, it is characterized in that described moisture eliminator 1 temperature out is 90-100 ℃.
6. by the energy-saving drying production method of the described gypsum of claim 1, the inlet temperature that it is characterized in that described moisture eliminator 2 is 350-650 ℃.
7. by the energy-saving drying production method of the described gypsum of claim 6, it is characterized in that described moisture eliminator inlet temperature is 500-600 ℃.
8. by the energy-saving drying production method of the described gypsum of claim 1, the temperature out that it is characterized in that described moisture eliminator 2 is 150-180 ℃.
9. by the energy-saving drying production method of the described gypsum of claim 8, the temperature out that it is characterized in that described moisture eliminator 2 is 160-170 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100508875A CN101186454A (en) | 2007-12-19 | 2007-12-19 | Energy-saving drying production method for gypsum |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007100508875A CN101186454A (en) | 2007-12-19 | 2007-12-19 | Energy-saving drying production method for gypsum |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101186454A true CN101186454A (en) | 2008-05-28 |
Family
ID=39479115
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007100508875A Pending CN101186454A (en) | 2007-12-19 | 2007-12-19 | Energy-saving drying production method for gypsum |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101186454A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630709A (en) * | 2016-09-26 | 2017-05-10 | 广西亿品投资有限公司 | Method for drying phosphogypsum with sulfuric acid tail gas |
| CN108996534A (en) * | 2018-07-09 | 2018-12-14 | 铜陵菻科工业石膏综合利用有限责任公司 | A method of reducing industry by-product gypsum moisture content |
-
2007
- 2007-12-19 CN CNA2007100508875A patent/CN101186454A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106630709A (en) * | 2016-09-26 | 2017-05-10 | 广西亿品投资有限公司 | Method for drying phosphogypsum with sulfuric acid tail gas |
| CN108996534A (en) * | 2018-07-09 | 2018-12-14 | 铜陵菻科工业石膏综合利用有限责任公司 | A method of reducing industry by-product gypsum moisture content |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103936313B (en) | The technique of building gypsum plaster prepared by a kind of phosphogypsum | |
| CN101955166B (en) | Method for decomposing semi-hydrated phosphogypsum | |
| CN103848407B (en) | A kind of production method of monoammonium phosphate | |
| CN103466661B (en) | One kind utilizes potassium feldspar calcium sulfate mineralising CO2The method of co-producing sulfuric acid potassium | |
| CN110803877B (en) | Device and method for producing II-type anhydrous gypsum from desulfurized gypsum | |
| CN101269922A (en) | Fine purification and energy-saving dewatering process for phosphogypsum | |
| CN107512857B (en) | Method and device for preparing building gypsum by phosphogypsum | |
| CN104555946A (en) | Method for jointly producing sulphuric acid and cement clinker by using sulphur gas to reduce gypsum | |
| CN112142350A (en) | Phosphogypsum desulfurization and calcination treatment system and treatment method | |
| CN213865977U (en) | Ardealite desulfurization calcination processing system | |
| CN103274616A (en) | Method for producing phosphorus building gypsum by phosphorous gypsum | |
| CN110128040B (en) | Equipment system for preparing anhydrite powder by large-scale phosphogypsum digestion | |
| JP2023530366A (en) | Quicklime production process and system with reduced carbon emissions | |
| CN103818884B (en) | The spouted fluidized decomposition technique of a kind of gypsum | |
| CN111003723B (en) | Method for preparing alpha-semi-hydrated gypsum by using chemical gypsum and alpha-semi-hydrated gypsum prepared by same | |
| CN103641344A (en) | Production technology of 'zero-carbon emission' cement combined with industrial gypsum waste treatment | |
| CN112266190B (en) | Device and method for producing self-excited II type anhydrous gypsum by using industrial byproduct gypsum | |
| CN1226222C (en) | Method for producing building gypsum powder using phosphrus gypsum | |
| CN101186454A (en) | Energy-saving drying production method for gypsum | |
| CN109775666A (en) | Coal gasification collaboration calcium sulfate calcining and carbon heat reducing prepare the device and method of sulphur | |
| CN1872763A (en) | Method for preparing architectural gypsum powder by using chemical gypsum as raw material through two steps method | |
| CN102078750A (en) | Recovery method of magnesium oxide flue gas desulfurization product | |
| CN111517681A (en) | Gypsum cooling and aging process | |
| CN103396023B (en) | A kind of preparation technology of inactive anhydrous calcium sulfate | |
| CN101830656A (en) | Method for realizing energy-saving emission-reducing low-carbon circular economy by utilizing chemical energy instead of heat energy |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Open date: 20080528 |