CN101215113A - Method for producing cement retarder by carbide slag desulfurization - Google Patents
Method for producing cement retarder by carbide slag desulfurization Download PDFInfo
- Publication number
- CN101215113A CN101215113A CNA2007103000785A CN200710300078A CN101215113A CN 101215113 A CN101215113 A CN 101215113A CN A2007103000785 A CNA2007103000785 A CN A2007103000785A CN 200710300078 A CN200710300078 A CN 200710300078A CN 101215113 A CN101215113 A CN 101215113A
- Authority
- CN
- China
- Prior art keywords
- cement
- carbide slag
- flue gas
- desulfurated plaster
- desulfurized gypsum
- 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.)
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Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B11/00—Calcium sulfate cements
- C04B11/28—Mixtures thereof with other inorganic cementitious materials
- C04B11/30—Mixtures thereof with other inorganic cementitious materials with hydraulic cements, e.g. Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2103/00—Function or property of ingredients for mortars, concrete or artificial stone
- C04B2103/20—Retarders
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Treating Waste Gases (AREA)
Abstract
The invention relates to a process for producing cement retarders, which uses acetylene sludge as raw materials to react with SO2 in flue gases to produce desulfurized gypsum which replaces natural gypsum to be used as production raw materials in cement plants to decarbolize, thereby producing cement retarders. The invention adopts acetylene sludge waste in chemical plant as main raw materials, adds water to modulate acetylene sludge with consistency of 20%-30% as a desulfurizer, sprays the desulfurizer into a flue gase thionizer of a coal-fired power plant to react with SO2 in flue gases to produce desulfurized gypsum, the desulfurized gypsum becomes granulated material via beading, low-temperature drying or drying, beading, thereby obtaining the cement retarders in cement plants. The invention utilizes the characters that Ca (OH) 2 which is the main chemical composition of acetylene sludge absorbs SO2 well, uses the composition as a desulfurizer for flue gas desulfurizing in an electric power plant, and changes the waste into valuable, the desulfurized gypsum after desulfurizing and dealing all replaces natural gypsum to act as the cement retarders for cement production, thereby resolving the pollution problems of acetylene sludge and desulfurized gypsum, being capable of achieving co-production of chemical engineering, electricity power and cement, and realizing the zero draining of industrial residues.
Description
Technical field:
The invention belongs to environment protection and comprehensive utilization of resources technical field, relating in particular to a kind of is raw material with the carbide slag, with the SO in the flue gas
2Reaction generates desulfurated plaster and replaces the method with producing cement retarder by carbide slag desulfurization of the plaster of paris as the cement mill cement setting retarder.
Background technology:
Carbide slag is to produce the waste residue that products such as acetylene gas, polyvinyl chloride, polyvinyl alcohol are discharged, and its major ingredient is a calcium hydroxide, and about 80% particle generally is the canescence scattered paste shape between 10～50 microns, and is mobile relatively poor.The discharging of carbide slag takies the good farmland, contaminate environment.
Coal is the main fuel (sulfur-bearing in the coal) of world today's electrical production, and the sulfur dioxide pollution air that the coal-burning power plant produces forms acid rain, causes serious environmental problem, causes the attention of countries in the world." Kyodo Protocol book " purpose of being participated in by 141 countries is exactly the discharging of the global greenhouse gases of restriction.The power plants Coal-fired capacity accounts for 1/3rd of national coal production.According to the statistics made by the departments concerned, national industrial source sulphur dioxide emission were 1,852 ten thousand tons in 1997, the sulfurous gas that discharges in atmosphere every year because of power plant soot is just up to more than 1,200 ten thousand tons, and it is about 50% to account for China's sulfur dioxide emissions total amount, accounts for about 75% of industrial sulphur dioxide emission.Therefore the primary measure to sulfur dioxide pollution control should be to reduce discharging power plant sulfurous gas.The original power Department of Industry clearly proposes in " 95 " planning: put into operation after 2000 and will reach 10000MW in the installed capacity of the sweetener correspondence of building, 1995 amended " People's Republic of China's topsoil prevents method " stipulate that clearly power plant must adopt the desulfurization measure; State Council spells out in the reply about acid rain control district and sulfur dioxide control district related problems: except that the focus factory of electricity determining by heat, forbid in big and medium-sized cities and the newly-built coal-fired station in the suburbs, newly-built in " two control district ", the coal-fired sulphur content of reconstructing is greater than 1% power plant, must build the desulfurization facility, existing coal sulfur-bearing is greater than 1% power plant, will be before 2000, take to reduce discharging the measure of sulfurous gas, before 2010, built up the desulfurization facility by stages and in groups or take the reduction of discharging sulfurous gas measure of other corresponding effects.
Flue gas desulfurization mainly contains dry method, semidrying, wet method three class Technologies.Used absorption agent has Wingdale, lime, calcium hydroxide etc., and these all will consume a large amount of limestone mine resources.According to statistics, the whole world has 20 countries and regions to use flue gas desulfurization equipment approximately, its equipment total installation of generating capacity is equivalent to 2.5～300,000,000 kW, its sulfur removal technology is based on wet type lime/lime stone-gypsum method, account for more than 80% of bulk devulcanization engineering, 1 ton of sulfurous gas of the every absorption of this sulfur removal technology approximately needs 1.2 tons in 1.6 tons in calcareous sweetening agent Wingdale or calcium hydroxide, produces 2.5 tons of desulfurated plasters.
The wet process of FGD technology has that desulphurization reaction speed is fast, desulfuration efficiency is high, the sorbent utilization advantages of higher.The desulfuration efficiency of the most sophisticated in the world wet type limestone/gypsum method desulfurization technology can reach more than 95% at present.
The carbide slag main chemical is a calcium hydroxide, accounts for more than 90%, and as sweetening agent, sweetening effectiveness is better than Wingdale.The principle of carbide slag desulfurization is that calcium hydroxide and the sulfur in smoke reaction in the carbide slag generates terra alba, that is:
Ca (OH)
2+ SO
2----CaSO
42H
2O (desulfurated plaster)
The main character of desulfurated plaster is embodied in:
1, particle is meticulous.The plaster of paris after crushed, about 140 μ m of fineness, and the desulfurated plaster particle diameter is less than 60 μ m (30～50 μ m), brings mobile and thixotropy problem owing to particle is meticulous.
2, certain water ratio is arranged.The desulfurated plaster water ratio is generally about 15%, because water ratio is higher, viscosity is strong, very easily sticks on the various device in the production process of loading, promote, carrying, and causes material to stop up, and influences normally carrying out of production process.
3, color is dark partially.Fine quality desulfurated plaster is lily, but common being Dark grey or being with yellow will influence outward appearance as brushing gypsum and gauge stuff.Major cause is that flue gas dust collecting system efficient is not high, causes desulfurated plaster to contain more flyash, secondly is because the impure influence that contains impurity such as iron of lime.
Desulfurated plaster is maximum different with the plaster of paris, is that desulfurated plaster contains some impurity, charcoal, calcium sulfite, metal ion or the like, and these impurity cause in various degree harm to the performance of plastering.
Summary of the invention:
The objective of the invention is to overcome the deficiencies in the prior art and a kind of main chemical Ca (OH) that utilizes carbide slag is provided
2Absorb SO
2Good characteristics, be used for means of flue gas desulfurization of power plant as sweetening agent, turn waste into wealth, desulfurated plaster after the desulfurization simultaneously is through handling, all replace the plaster of paris to be used for the method with producing cement retarder by carbide slag desulfurization of manufacture of cement as cement setting retarder, solve the residue contamination that carbide slag and flue gas desulfurization produce, can realize the coproduction of chemical industry, electric power and cement, realized the zero release of industrial residue.
The object of the present invention is achieved like this:
At first, adopting the waste carbide slag in chemical plant is main raw material, adds water furnishing concentration and be 20%～30% carbide slag slurries as sweetening agent, spray in the flue gas desulphurization tower with flue gas in SO
2Reaction generates desulfurated plaster.
Then, desulfurated plaster passes through balling-up, cryodrying or drying, balling-up again, obtains particulate materials, promptly becomes the cement setting retarder in cement mill,
Carbide slag is the waste residue that the acetylene producer produces, and adds water and makes the top of 20%～30% carbide slag slurry by in-line pump supply flue gas desulphurization tower, and spray into the SO that absorbs in the thionizer in the flue gas
2, with the SO in the flue gas
2Reaction generates desulfurated plaster.
The drying temperature of desulfurated plaster is not higher than 140 ℃.
The present invention has following positively effect:
The purposes of desulfurated plaster mainly contains two kinds, and a kind of is to be used to produce plastering, and another kind is to be used for cement setting retarder.The present invention relates generally to the production of cement setting retarder.Cement setting retarder is the indispensable raw material in the silicate cement production process, and its admixture ratio is generally 3%～5%.Traditional way all follows in present most of manufacturer, and as retardant, its major ingredient is a terra alba with the plaster of paris.Because the putty phenomenon often takes place, so still can not directly be used by the particularly big-and-middle-sized manufacturing enterprise of cement production enterprise in desulfurated plaster water ratio height in process of production.Must handle desulfurated plaster,, make particulate materials, could satisfy need of industrial production such as cement mill storing material, conveying and metering desulfurated plaster dehydration, dry, balling-up.Desulfurated plaster is very responsive to bake out temperature, the temperature height be easy to generate semi-hydrated gypsum or dehydrated gyp-.These half water or dehydrated gyp-s are used for manufacture of cement and all can produce the anxious coagulation phenomena (time of coagulation is very fast) of cement, so all can not use as cement setting retarder.Dihydrate gypsum (CaSO
42H
2O) in the time of 80.5 ℃, can lose planar water, since 135 ℃, dihydrate gypsum (CaSO
42H
2O) begin to lose 1.5 crystal water and become semi-hydrated gypsum (CaSO
40.5H
2O),, can lose whole crystal water, become dehydrated gyp-(CaSO to 183.8 ℃
4).So the drying of dehydrated gypsum must adopt cryodrying.
Characteristics of the present invention are:
1, utilized the main chemical Ca (OH) of carbide slag
2Absorb SO
2Good characteristics are used for means of flue gas desulfurization of power plant as sweetening agent, turn waste into wealth.
2, the waste residue after the desulfurization, just desulfurated plaster all replaces the plaster of paris to be used for manufacture of cement as cement setting retarder through handling, and has eliminated the waste residue that flue gas desulfurization produces, can realize the coproduction of chemical industry, electric power and cement, realize the zero release of industrial residue.
Embodiment:
Method of the present invention realizes by following technological approaches.
The first, carbide slag absorbs the SO in the flue gas as sweetening agent
2The carbide slag of chemical plant emission enters stock tank through pre-screening, and adjustment concentration is 20%～30% carbide slag slurries in the carbide slag stock tank.Then, send the SO that absorbs in the thionizer in the flue gas to by transferpump
2Finally generate desulfurated plaster through a series of physical-chemical reactions.
The second, desulfurated plaster through not being higher than 140 ℃ of temperature dryings, obtains mainly with CaSO through balling-up again
42H
2O is the particulate materials of essential mineral, all replaces the plaster of paris to be used for the cement mill raw material, and the making cement retardant uses.
It is main raw material that the present invention adopts the waste carbide slag in chemical plant, adds water furnishing concentration and be 20%～30% carbide slag slurries as sweetening agent, spray in the flue gas desulphurization tower with flue gas in SO
2Reaction generates desulfurated plaster, and desulfurated plaster passes through balling-up, cryodrying or drying, balling-up again, obtains particulate materials, promptly becomes the cement setting retarder in cement mill.Carbide slag is the waste residue that the acetylene producer produces, and adds water and makes the top of 20%～30% carbide slag slurry by in-line pump supply flue gas desulphurization tower, and spray into the SO that absorbs in the thionizer in the flue gas
2, with the SO in the flue gas
2Reaction generates desulfurated plaster.The drying temperature of desulfurated plaster is not higher than 140 ℃.
Claims (3)
1. method with producing cement retarder by carbide slag desulfurization, it is characterized in that: adopting the waste carbide slag in chemical plant is main raw material, add water furnishing concentration and be 20%～30% carbide slag slurries as sweetening agent, spray in the flue gas desulphurization tower with flue gas in SO
2Reaction generates desulfurated plaster, and desulfurated plaster passes through balling-up, cryodrying or drying, balling-up again, obtains particulate materials, promptly becomes the cement setting retarder in cement mill.
2. according to the described method of claim 1 with producing cement retarder by carbide slag desulfurization, it is characterized in that: the waste residue that carbide slag produces for the acetylene producer, add water and make the top of 20%～30% carbide slag slurry, and spray into the SO that absorbs in the thionizer in the flue gas by in-line pump supply flue gas desulphurization tower
2, with the SO in the flue gas
2Reaction generates desulfurated plaster.
3. according to the described method with producing cement retarder by carbide slag desulfurization of claim 1, it is characterized in that: the drying temperature of desulfurated plaster is not higher than 140 ℃.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103000785A CN101215113A (en) | 2007-12-27 | 2007-12-27 | Method for producing cement retarder by carbide slag desulfurization |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2007103000785A CN101215113A (en) | 2007-12-27 | 2007-12-27 | Method for producing cement retarder by carbide slag desulfurization |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN101215113A true CN101215113A (en) | 2008-07-09 |
Family
ID=39621633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNA2007103000785A Pending CN101215113A (en) | 2007-12-27 | 2007-12-27 | Method for producing cement retarder by carbide slag desulfurization |
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|---|---|
| CN (1) | CN101215113A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010146A (en) * | 2010-10-15 | 2011-04-13 | 中钢集团武汉安全环保研究院有限公司 | Method for modifying desulfuration ash for cement retarder |
| CN102225781A (en) * | 2011-04-01 | 2011-10-26 | 洛阳理工学院 | Preparation method of cement delayed coagulant |
| CN103028323A (en) * | 2012-12-10 | 2013-04-10 | 安阳化学工业集团有限责任公司 | Method for desulfurization of flue gas in coal-fired boiler by using coal mortar |
| CN106435162A (en) * | 2016-11-22 | 2017-02-22 | 江苏省冶金设计院有限公司 | System and method for preparing desulfurization gypsum through ferri sulphur |
| CN115006982A (en) * | 2022-01-18 | 2022-09-06 | 昆明理工大学 | Method for desulfurizing and carbon-fixing coal-fired flue gas by using carbide slag slurry |
-
2007
- 2007-12-27 CN CNA2007103000785A patent/CN101215113A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102010146A (en) * | 2010-10-15 | 2011-04-13 | 中钢集团武汉安全环保研究院有限公司 | Method for modifying desulfuration ash for cement retarder |
| CN102225781A (en) * | 2011-04-01 | 2011-10-26 | 洛阳理工学院 | Preparation method of cement delayed coagulant |
| CN103028323A (en) * | 2012-12-10 | 2013-04-10 | 安阳化学工业集团有限责任公司 | Method for desulfurization of flue gas in coal-fired boiler by using coal mortar |
| CN103028323B (en) * | 2012-12-10 | 2015-07-01 | 安阳化学工业集团有限责任公司 | Method for desulfurization of flue gas in coal-fired boiler by using coal mortar |
| CN106435162A (en) * | 2016-11-22 | 2017-02-22 | 江苏省冶金设计院有限公司 | System and method for preparing desulfurization gypsum through ferri sulphur |
| CN115006982A (en) * | 2022-01-18 | 2022-09-06 | 昆明理工大学 | Method for desulfurizing and carbon-fixing coal-fired flue gas by using carbide slag slurry |
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Open date: 20080709 |