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Slag powder modified with sintering flue gas based dry desulfurization ash and preparation method of slag powder

A dry-process desulfurization ash and sintering flue gas technology, which is applied in cement production and other directions, can solve the problems of secondary pollution and land occupation, and achieve the effects of reducing pollution, increasing compressive strength, and creating economic benefits

Inactive Publication Date: 2017-09-19
SHANGHAI RES INST OF BUILDING SCI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, only a small part of sintering flue gas dry desulfurization ash is used at home and abroad, and most of it is discarded. The treatment method will not only cause secondary pollution, but also occupy land

Method used

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  • Slag powder modified with sintering flue gas based dry desulfurization ash and preparation method of slag powder
  • Slag powder modified with sintering flue gas based dry desulfurization ash and preparation method of slag powder
  • Slag powder modified with sintering flue gas based dry desulfurization ash and preparation method of slag powder

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] In this example, sinter flue gas dry desulfurization ash was mixed with slag powder at a ratio of 3%, 5%, 8%, and 10%, and the compressive strength and flexural strength of the cement mortar were tested. The results are shown in Table 2.

[0028] Table 2: Strength test results of flue gas sintering desulfurization ash modified blast furnace slag-cement mortar

[0029]

[0030] It can be seen from Table 2 that the addition of sintered desulfurization ash significantly improves the strength performance of the cement mortar system. When the content of sintering flue gas dry desulfurization ash in the modified slag powder is 5% (group B3), the 3d, 7d, 28d resistance Compared with the slag powder without adding sintered desulfurization ash (group B1), the compressive strength increased by 15.9%, 4.9%, and 6.2%, respectively.

Embodiment 2

[0032] In this example, the drying shrinkage test of cement mortar is carried out on the modified slag powder of sintering flue gas dry desulfurization ash, and the test results are shown in image 3 . Depend on image 3 It can be seen that with the addition of sintering flue gas dry desulfurization ash, the dry shrinkage value of the cement mortar system increases significantly. When the content of sintering flue gas dry desulfurization ash in the modified slag powder is 5% (group B3), 7d , 14d, 28d, 60d, and 90d dry shrinkage relative to the mineral powder without sintered desulfurization ash (group B1), respectively increased by 29.6%, 28.3%, 21%, 21%, and 13%.

Embodiment 3

[0034] In this example, the slag powder modified by the sintering flue gas dry process desulfurization ash was tested for the free expansion rate of the cement slurry immersed in water, and the test results are shown in Table 3.

[0035] Table 3: Free expansion rate of sintering flue gas dry desulfurization ash modified slag powder cement slurry soaked in water × 10 -4

[0036]

[0037] It can be seen from Table 3 that: ① When the amount of sintered desulfurization ash accounts for 10% of the slag powder (B5), after 24 hours of molding of sintered desulfurization ash modified mineral powder-cement slurry, it is difficult to remove the formwork, and two test blocks are broken. When sintering flue gas dry desulfurization ash modifies blast furnace slag powder, its dosage must be strictly controlled. ②The addition of sintering flue gas dry desulfurization ash significantly improves the water-immersion free expansion performance of the cement paste system, and with the increas...

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Abstract

The invention provides slag powder modified with sintering flue gas based dry desulfurization ash and a preparation method of the slag powder. The slag powder modified with the sintering flue gas based dry desulfurization ash is a mixture prepared from components in percentage by weight as follows: 1%-10.0% of the sintering flue gas based dry desulfurization ash and 90.0%-99.0% of the slag powder. The preparation method comprises steps as follows: a, the sintering flue gas based dry desulfurization ash and the slag powder are prepared; b, 1%-10.0% by weight of the sintering flue gas based dry desulfurization ash and 90.0%-99.0% by weight of the slag powder are mixed by a sample mixing machine; c, an activity index test is performed on the slag powder modified with sintering flue gas based dry desulfurization ash by referring to GB / T18046, and an appropriate ratio of the sintering flue gas based dry desulfurization ash to the slag powder is determined; d, tests for dry shrinkage rate and water-immersion free swelling ratio of the slag powder modified with the sintering flue gas based dry desulfurization ash are performed by referring to JC / T603 and JC / T313, and a mixing ratio of the sintering flue gas based dry desulfurization ash to the slag powder is optimized.

Description

technical field [0001] The invention relates to a sintering flue gas dry desulfurization ash modified slag powder and a preparation method thereof, belonging to the technical field of cement concrete engineering materials. Background technique [0002] SO for the steel industry 2 The emission pollution situation is becoming more and more severe, and the sintering process is the main SO in the iron and steel industry 2 emission sources, whose emissions account for SO in the iron and steel industry 2 40% to 80% of the total emissions. Although the semi-dry desulfurization technology is used for sintering flue gas desulfurization, the investment is low, the desulfurization rate is high, and it has broad market prospects. However, a large amount of sintered flue gas dry desulfurization ash is produced in the semi-dry desulfurization process, which is different from the desulfurized gypsum produced by wet flue gas desulfurization, and also different from the fly ash collected ...

Claims

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Application Information

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IPC IPC(8): C04B7/21
CPCC04B7/21Y02P40/10
Inventor 杨利香
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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