CN103553466A - FGD (flue gas desulfurization) desulfurized fly ash solidifying agent and preparation method thereof - Google Patents
FGD (flue gas desulfurization) desulfurized fly ash solidifying agent and preparation method thereof Download PDFInfo
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- CN103553466A CN103553466A CN201310522318.1A CN201310522318A CN103553466A CN 103553466 A CN103553466 A CN 103553466A CN 201310522318 A CN201310522318 A CN 201310522318A CN 103553466 A CN103553466 A CN 103553466A
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Abstract
The invention discloses an FGD (flue gas desulfurization) desulfurized fly ash solidifying agent, and the FGD desulfurized fly ash solidifying agent is characterized by comprising the following components in percentage by weight: 25-40% of desulfurized fly ash, 50-65% of composite powder of mineral slag and steel slag, 0-3% of anhydrous gypsum, 5-10% of calcified bentonite, and 0-1% of additive, wherein the additive is an FDN water reducer or calcium formate, the mass ratio of the mineral slag powder to the steel slag in the composite powder of the mineral slag and steel slag is (1:1.5)-(1:2). The invention further provides a preparation method of the FGD desulfurized fly ash solidifying agent. The solidifying agent is prepared by compounding the desulfurized fly ash with superfine mineral slag powder and steel slag, not only can the pollution problem caused by stockpiling of the steel slag be effectively solved, but also the problem of bad stability when the steel slag is used as an admixture of building materials is solved; the processing and handling efficiency of the waste slag of a steel enterprise is improved, the development level of the secondary resource is improved, the concrete usage amount in the building material industry is reduced, and the solidifying agent makes contribution to the national energy conservation and emission reduction.
Description
Technical field
The invention belongs to metallurgical environmental protection technical field, specifically refer to a kind of FGD desulphurize fly ash solidifying agent and preparation method thereof.
Background technology
Desulfurization flying ash is that steel enterprise sintering environment friendly system produces a kind of desulfurization refuse, but Wuhan Iron and Steel Plant year generation with regard to approximately 30,000 tons, and a kind of industrial residue producing when simultaneously slag is steel-making, its quantity is generally 10～20% of crude steel output, generation is huge.The generation of national slag in 2006 is about 0.7 hundred million tons, and the comprehensive utilization ratio of slag only has 20% according to incompletely statistics.The shortcomings such as traditional process for treating steel slag ubiquity floor space is large, processing environment is seriously polluted, devices consume is large; Simultaneously general modified method, conventionally because active oxidation calcium contents in slag is high, unstable, cannot be promoted the use of normally.The on-site environment of ，Gei iron and steel enterprise of storing up in a large number of slag has brought a large amount of dust pollutions, has also taken in a large number valuable land resources, " the dual waste " of this resource of being known as in environmentalism simultaneously.
Summary of the invention
For the deficiencies in the prior art, the object of this invention is to provide a kind of FGD desulphurize fly ash solidifying agent and preparation method thereof, can not be for the problem of production of construction materials without ageing, stabilization treatment to solve desulphurize fly ash, solve municipal dredging silt simultaneously and cannot process and store up in a large number occupation of land and the secondary pollution problem of bringing.
For achieving the above object, FGD desulphurize fly ash solidifying agent provided by the invention, it is characterized in that: by percentage to the quality, this solidifying agent is grouped into by following one-tenth: 25～40% desulfurization flying ash, 50～65% Furnace Slag Steel Slag composite powder, 0～3% dehydrated gyp-, 5～10% calcification wilkinite, 0～1% admixture; Described admixture is FDN water reducer or calcium formiate, and in described Furnace Slag Steel Slag composite powder, the mass ratio of slag powders and slag is 1: 1.5～1: 2.
As preferred version, by percentage to the quality, this solidifying agent is grouped into by following one-tenth: 25～35% desulfurization flying ash, 60～65% Furnace Slag Steel Slag composite powder, 1～2% dehydrated gyp-, 5～10% calcification wilkinite, 0.5～0.8% admixture.
The present invention also provides a kind of preparation method of above-mentioned FGD desulphurize fly ash solidifying agent, comprises the steps:
1) material preprocessing: get desulfurization flying ash and put into 80～85 ℃ of oven dry of baking oven 1.5～2 hours; Getting levigating steel slag becomes steel slag particle and puts into 80～85 ℃, baking oven to dry 1.5～2 hours; Get slag after levigate, screening, dry and to obtain slag powders; Get finished product dehydrated gyp-, calcification wilkinite and admixture standby;
2) system material: by described proportioning take slag powders, steel slag particle is mixed into Furnace Slag Steel Slag composite powder; by described proportioning, take desulfurization flying ash, Furnace Slag Steel Slag composite powder, dehydrated gyp-, calcification wilkinite and admixture mix and blend 5～15 minutes again; mix rear discharging; finally send in vacuum tank and store, obtain FGD desulphurize fly ash solidifying agent.
Further, in described step 1), slag carries out fragmentation with sand machine processed, obtains the particle diameter≤1mm of steel slag particle after screening, and steel slag particle is dried to water ratio <1%.
Further, in described step 1), the slag powders specific surface area that slag is levigate to be made is not less than 450m
2/ kg, and slag powders is dried to water ratio <1%.
The invention has the advantages that: the present invention is directed to desulphurize fly ash can not be for the technical bottleneck of production of construction materials without ageing, stabilization treatment, adopt desulphurize fly ash and slag micropowder-slag compounding technology to produce solidifying agent, not only can effectively solve slag and store up the pollution problem bringing, the bad problem of stability in the time of simultaneously can solving slag and make building materials adulterant, the inventive method can improve processing and the disposal efficiency of steel enterprise waste residue, improve the development level of secondary resource, also can reduce the usage quantity of building material industry cement, for national energy-saving reduces discharging, contribute simultaneously.
Embodiment
Below in conjunction with specific embodiment, the present invention is described in further detail.
Embodiment mono-:
The present invention prepares FGD desulphurize fly ash solidifying agent in accordance with the following steps:
1) material preprocessing:
(1) get desulfurization flying ash, put into 80～85 ℃, baking oven and dry 1.5～2 hours, slag carries out fragmentation with sand machine processed, after screening, control the particle diameter d1mm of steel slag particle, and steel slag particle is put into 80～85 ℃, baking oven dry 1.5～2 hours to water ratio <1%, standby; (2) get the levigate slag powders that makes of slag, control its specific surface area and be not less than 450m
2/ kg, after screening, dries and slag powders is dried to water ratio <1%, standby; (3) get finished product dehydrated gyp-, calcification wilkinite, FDN water reducer, standby;
2) system material: take slag powders, steel slag particle is mixed into Furnace Slag Steel Slag composite powder, in Furnace Slag Steel Slag composite powder, the mass ratio of slag powders and slag is 1: 1.6; Take again desulfurization flying ash 25kg, Furnace Slag Steel Slag composite powder 65kg, finished product dehydrated gyp-3kg, calcification wilkinite 6kg, FDN water reducer 1kg and pour in three axle stirrers mix and blend into 5 minutes, slag powders 25kg in Furnace Slag Steel Slag composite powder wherein, slag 40kg, after mixing, discharging, utilize packing machine overlay film packing or air pressure to be pumped in vacuum tank and store, obtain FGD desulphurize fly ash solidifying agent.
Embodiment bis-:
The present invention prepares the step of FGD desulphurize fly ash solidifying agent with embodiment mono-, and difference is: admixture used is calcium formiate and the combination of calcification wilkinite; In the Furnace Slag Steel Slag composite powder taking, the mass ratio of slag powders and slag is 1: 1.5; Take again desulfurization flying ash 40kg, Furnace Slag Steel Slag composite powder 50kg, finished product dehydrated gyp-2kg, calcification wilkinite 7kg, FDN water reducer 1kg and pour in three axle stirrers mix and blend into 10 minutes, slag powders 20kg in Furnace Slag Steel Slag composite powder wherein, slag 30kg.
Embodiment tri-:
The present invention prepares the step of FGD desulphurize fly ash solidifying agent with embodiment mono-, and difference is: in the Furnace Slag Steel Slag composite powder taking, the mass ratio of slag powders and slag is 1: 2; Take again desulfurization flying ash 35kg, Furnace Slag Steel Slag composite powder 60kg, calcification wilkinite 5kg and pour in three axle stirrers mix and blend into 15 minutes, slag powders 20kg in Furnace Slag Steel Slag composite powder wherein, slag 40kg.
Embodiment tetra-:
The present invention prepares the step of FGD desulphurize fly ash solidifying agent with embodiment mono-, and difference is: admixture used is calcium formiate and the combination of calcification wilkinite; In the Furnace Slag Steel Slag composite powder taking, the mass ratio of slag powders and slag is 1: 2; Take again desulfurization flying ash 30kg, Furnace Slag Steel Slag composite powder 60kg, finished product dehydrated gyp-1.5kg, calcification wilkinite 8kg, FDN water reducer 0.5kg and pour in three axle stirrers mix and blend into 5 minutes, slag powders 20kg in Furnace Slag Steel Slag composite powder wherein, slag 40kg.
Embodiment five:
The present invention prepares the step of FGD desulphurize fly ash solidifying agent with embodiment mono-, and difference is: in the Furnace Slag Steel Slag composite powder taking, the mass ratio of slag powders and slag is 1: 1.5; Take again desulfurization flying ash 40kg, Furnace Slag Steel Slag composite powder 50kg, finished product dehydrated gyp-1.2kg, calcification wilkinite 8kg, FDN water reducer 0.8kg and pour in three axle stirrers mix and blend into 10 minutes, slag powders 20kg in Furnace Slag Steel Slag composite powder wherein, slag 30kg.
Beneficial effect of the present invention is as follows:
One, desulfurization flying ash is directly used as solidifying agent starting material without ageing, stabilization treatment.
Its two, desulfurization flying ash volume surpasses more than 25%, effectively overcomes the negative factor impacts such as municipal dredging silt high-moisture percentage >300%, high organic content >85%.
Its three, solidifying agent composition does not require silt content in particulate matter, this solidifying agent production process energy consumption is little, slag slag incorporation is large, and production cost is low, good product quality, under equal conditions, impervious, the water stability of its mud after fixed can greatly improve coefficient of softening and be greater than 0.90; Antiacid alkali salt medium chemical erosion coefficient is greater than 1.0; Freeze-thaw-circulation ability can double; Permeability coefficient reaches (10-6)～(10-8) cm/s.
Claims (5)
1. a FGD desulphurize fly ash solidifying agent, it is characterized in that: by percentage to the quality, this solidifying agent is grouped into by following one-tenth: 25～40% desulfurization flying ash, 50～65% Furnace Slag Steel Slag composite powder, 0～3% dehydrated gyp-, 5～10% calcification wilkinite, 0～1% admixture; Described admixture is FDN water reducer or calcium formiate, and in described Furnace Slag Steel Slag composite powder, the mass ratio of slag powders and slag is 1: 1.5～1: 2.
2. FGD desulphurize fly ash solidifying agent according to claim 1, it is characterized in that: by percentage to the quality, this solidifying agent is grouped into by following one-tenth: 25～35% desulfurization flying ash, 60～65% Furnace Slag Steel Slag composite powder, 1～2% dehydrated gyp-, 5～10% calcification wilkinite, 0.5～0.8% admixture.
3. a preparation method for FGD desulphurize fly ash solidifying agent described in claim 1, comprises the steps:
1) material preprocessing: get desulfurization flying ash and put into 80～85 ℃ of oven dry of baking oven 1.5～2 hours; Getting levigating steel slag becomes steel slag particle and puts into 80～85 ℃, baking oven to dry 1.5～2 hours; Get slag after levigate, screening, dry and to obtain slag powders; Get finished product dehydrated gyp-, calcification wilkinite and admixture standby;
2) system material: by described proportioning take slag powders, steel slag particle is mixed into Furnace Slag Steel Slag composite powder; by described proportioning, take desulfurization flying ash, Furnace Slag Steel Slag composite powder, dehydrated gyp-, calcification wilkinite and admixture mix and blend 5～15 minutes again; mix rear discharging; finally send in vacuum tank and store, obtain FGD desulphurize fly ash solidifying agent.
4. the preparation method of FGD desulphurize fly ash solidifying agent according to claim 3, it is characterized in that: in described step 1), slag carries out fragmentation with sand machine processed, obtains the particle diameter d1mm of steel slag particle after screening, and steel slag particle is dried to water ratio <1%.
5. the preparation method of FGD desulphurize fly ash solidifying agent according to claim 3, is characterized in that: in described step 1), the slag powders specific surface area that slag is levigate to be made is not less than 450m
2/ kg, and slag powders is dried to water ratio <1%.
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Cited By (3)
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| CN108745282A (en) * | 2018-05-25 | 2018-11-06 | 武汉钢铁有限公司 | A kind of flue gas desulfurization and denitrification pressed active carbon and preparation method thereof based on metallurgical solid waste |
| CN109160794A (en) * | 2018-08-21 | 2019-01-08 | 湖北大学 | A kind of high water detritus sludge consolidating agent and its synthetic method |
| CN110218010A (en) * | 2019-07-03 | 2019-09-10 | 遵化市中环固体废弃物综合利用有限公司 | A kind of preparation method of cementing filling material |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108745282A (en) * | 2018-05-25 | 2018-11-06 | 武汉钢铁有限公司 | A kind of flue gas desulfurization and denitrification pressed active carbon and preparation method thereof based on metallurgical solid waste |
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| CN109160794A (en) * | 2018-08-21 | 2019-01-08 | 湖北大学 | A kind of high water detritus sludge consolidating agent and its synthetic method |
| CN110218010A (en) * | 2019-07-03 | 2019-09-10 | 遵化市中环固体废弃物综合利用有限公司 | A kind of preparation method of cementing filling material |
| CN110218010B (en) * | 2019-07-03 | 2021-05-11 | 遵化市中环固体废弃物综合利用有限公司 | Preparation method of filling cementing material |
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Effective date of registration: 20170627 Address after: 430083, Hubei Wuhan Qingshan District Factory No. 2 Gate joint stock company organs Patentee after: Wuhan iron and Steel Company Limited Address before: 430080 Wuchang, Hubei Friendship Road, No. A, block, floor 999, 15 Patentee before: Wuhan Iron & Steel (Group) Corp. |
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Granted publication date: 20151111 Termination date: 20201029 |