Mineral powder modified by sintering dry desulphurization ash and preparation method thereof

A technology of dry desulfurization ash and sintered desulfurization ash, which is applied in the directions of climate sustainability, sustainable waste treatment, solid waste management, etc. Anti-shrinkage crack performance, reduced energy consumption, excellent resistance to chloride ion penetration

Inactive Publication Date: 2012-07-18
BAOSHAN IRON & STEEL CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] In order to avoid new secondary pollution caused by the ineffective disposal and utilization of desulfurization by-products

Method used

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  • Mineral powder modified by sintering dry desulphurization ash and preparation method thereof
  • Mineral powder modified by sintering dry desulphurization ash and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Slag powder 99wt%, 7d activity index 78%, 28d activity index 105%, density 2.90g / cm 3 , specific surface area 420m 2 / kg;

[0026] Sinter dry desulfurization ash 1wt%.

[0027] The above two materials are mechanically stirred and mixed uniformly to make a sintered dry desulfurization ash modified mineral powder sample. Refer to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the sintered dry desulfurization ash modified slag powder sample. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 2

[0029] Blast furnace slag 98wt%;

[0030] Sinter dry desulfurization ash 2wt%.

[0031] The sintering dry desulfurization ash is put into the batching bin, and is put into the mill together with the blast furnace slag through the weighing belt according to the proportion, and processed into modified slag through grinding, powder selection and other processes. Sampling of the modified slag out-of-store samples, referring to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete", to test the performance of the samples in all aspects. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

Embodiment 3

[0033] Slag fine powder 97wt%, 7d activity index 78%, 28d activity index 105%, density 2.90g / cm 3 , specific surface area 420m 2 / kg;

[0034] Sintered desulfurization ash 3wt%.

[0035] The sintering dry desulfurization ash enters the batching bin, and is fed into the mill with the blast furnace slag according to the proportion through the weighing belt, and is processed into modified slag through grinding, powder selection and other processes. Sampling the outbound sample of sintered dry desulfurization ash modified slag powder, referring to GB / T18046-2008 "Granulated Blast Furnace Slag Powder Used in Cement and Concrete" to test the performance of the sample in all aspects. The benchmark cement is Conch brand 42.5 Portland cement, and the test results are shown in Table 1.

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Abstract

The invention discloses a mineral powder modified by sintering dry desulphurization ash and a preparation method thereof. The 7-day activity index of the mineral powder modified by sintering dry desulphurization ash is more than 80%, the 28-day activity index is more than 100%, the specific surface area is more than or equal to 400 m2/kg, the sulfur trioxide content is less than or equal to 4.0%, the chloride ion content is less than or equal to 0.06%, the loss on ignition is less than or equal to 3.0% and the motility ratio is more than or equal to 100%. The mineral powder is made from the following raw materials in percentage by weight: 95 to 99% of blast-furnace slag powders and 1 to 5% of sintering dry desulphurization ash. The 7-day activity index and 28-day activity index of the modified mineral powder are greatly increased as compared with the common mineral powders, the requirement for specific surface area is reduced, and the energy consumption for milling slag powders can be reduced effectively. When applied to premixed concrete, the modified mineral powder is excellent in durability indices such as carbonization resistance, freeze resistance and chloride ion infiltration resistance, can effectively improve the working performance of concrete and improve the early-stage shrinkage crack resistance of hardened concrete.

Description

technical field [0001] The invention belongs to the technical field of new materials, environmental protection and energy saving, and specifically relates to a sintered dry desulfurization ash modified mineral powder and a preparation method thereof, which provides an effective way for resource utilization of solid waste such as sintered dry desulfurization ash in iron and steel enterprises . Background technique [0002] Foreign sintering desulfurization technology started earlier, and the desulfurization technology is already very mature. Japan began to treat sintering flue gas in the 1970s, and is the first country in the world to treat sintering flue gas. In the 1970s, Japan's sintering desulfurization process was represented by wet processes such as limestone-gypsum method and ammonia-thiamine method. In the 1980s, it was represented by dry processes such as activated carbon and magnesium oxide methods. At present, the wet flue gas desulfurization of some enterprises ...

Claims

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Application Information

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IPC IPC(8): C04B18/12
CPCY02W30/91
Inventor 顾文飞陈健徐兵康明刘剑平唐欧靖陈忠平周维
Owner BAOSHAN IRON & STEEL CO LTD
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