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A kind of sulfur-fixing ash slag cement and preparation method thereof

A technology for sulfur-fixing ash and sulfur-fixing slag is applied in the field of cement cementitious materials, which can solve the problems of large water demand and self-hardening, effective utilization of cement production, etc., and achieves cost reduction, good social and economic benefits, and large-scale The effect of absorption

Active Publication Date: 2019-06-28
INNER MONGOLIA YILI JIDONG CEMENT CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the sulfur-fixed ash generated by the operation of circulating fluidized bed boilers, due to the various influences of the boiler operating process such as fuel quality, desulfurization in the furnace, and low furnace temperature, its physical and chemical properties are comparable to those of fly ash produced by pulverized coal furnaces. The large difference is mainly manifested in large water demand, self-hardening and later expansion; therefore, it is difficult to make it widely used in cement production by using the existing fly ash utilization technology
For the same reason, the slag discharged from the bottom of the circulating fluidized bed boiler has not yet been effectively utilized in cement production

Method used

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  • A kind of sulfur-fixing ash slag cement and preparation method thereof
  • A kind of sulfur-fixing ash slag cement and preparation method thereof
  • A kind of sulfur-fixing ash slag cement and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] (1) Preparation of sulfur-fixed ash powder: The sulfur-fixed ash that meets the standard of "Fly Ash Used in Cement and Concrete" (GB / T1596-2005) is ground with a power plant waste heat steam kinetic energy mill, and the specific surface area is 1004m 2 / kg.

[0020] (2) Preparation of sulfur-fixing slag powder: Grind the sulfur-fixing slag finely with a cement ball mill. Sieve residue) was 16.7%.

[0021] (3) Preparation of Portland cement clinker powder: The Portland cement clinker that meets the "General Portland Cement" (GB175-2007) standard is ground with a cement ball mill, and the fineness (45 μm square hole sieve Sieve residue) was 14.5%.

[0022] (4) Preparation of desulfurized gypsum powder: after drying the desulfurized gypsum at room temperature, it was ground with a cement ball mill to a fineness (45 μm square hole sieve residue) of 12.6%.

[0023] Preparation of P F42.5 cement: According to the formula of material dosage, sulfur-fixing ash powder 40; s...

Embodiment 2

[0030] (1) Preparation of sulfur-fixed ash powder: The sulfur-fixed ash that meets the standard of "Fly Ash Used in Cement and Concrete" (GB / T1596-2005) is ground with a power plant waste heat steam kinetic energy mill, and the specific surface area is 1121m 2 / kg.

[0031] (2) Preparation of sulfur-fixing slag powder: Grind the sulfur-fixing slag finely with a cement ball mill. Sieve residue) was 15.2%.

[0032] (3) Preparation of Portland cement clinker powder: The Portland cement clinker that meets the "General Portland Cement" (GB175-2007) standard is ground with a cement ball mill, and the fineness (45 μm square hole sieve Sieve residue) was 12.3%.

[0033] (4) Preparation of desulfurized gypsum powder: after drying the desulfurized gypsum at room temperature, it was ground with a cement ball mill to a fineness (45 μm square hole sieve residue) of 12.8%.

[0034] Preparation of P F42.5 cement: According to the formula of material dosage, sulfur-fixing ash powder 50; s...

Embodiment 3

[0041] (1) Preparation of sulfur-fixed ash powder: The sulfur-fixed ash that meets the standard of "Fly Ash Used in Cement and Concrete" (GB / T1596-2005) is ground with a power plant waste heat steam kinetic energy mill, and the specific surface area is 1054m 2 / kg.

[0042] (2) Preparation of mixed powder consisting of sulfur-fixing slag, Portland cement clinker and desulfurized gypsum: based on the total mass of the prepared cement, 28% of sulfur-fixing slag, 34% of Portland cement clinker, and desulfurized gypsum 3% weighing; after it is mixed, it is ground with a cement ball mill, and the fineness of the mixed powder (45 μm square hole sieve) is 14.1%;

[0043] Preparation of P·F42.5 cement: Based on the total mass of prepared cement, weigh 35% of sulfur-fixed ash powder and 65% of the above-mentioned mixed powder, and mix them evenly.

[0044] The cement inspection result and quality of embodiment 3 are shown in Table 3.

[0045] The cement inspection result of table 3 ...

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Abstract

The invention relates to the fields of cement gel materials and recycling of solid wastes produced by a circulating fluidized bedboiler in a thermal power plant, and particularly provides sulfur-fixed ash slag cement and a preparation method of the sulfur-fixed ash slag cement. The invention aims at maximizing the recycling of sulfur-fixed ash, sulfur-fixed slag and desulfurized gypsum produced in thermal power generation in the cement by effective technological means, giving play to the combined physical and chemical effects of various material components, and develops the sulfur-fixed ash slag cement meeting the existing national standards and having a broad market prospect and the preparation method of the sulfur-fixed ash slag cement. The sulfur-fixed ash slag cement comprises the following components in percentage by mass: 35-50 percent of sulfur-fixed ash powder, 17-28 percent of sulfur-fixed slag powder, 25-37 percent of Portland cement pulverized clinker and 2-3 percent of desulfurized gypsum powder, wherein the specific surface area of the sulfur-fixed ash powder is not less than 1,000 m<2> / kg, and the sieve residue value of a square hole sieve with the fineness of 45 [mu]m of the sulfur-fixed slag powder is 15%-17%.

Description

technical field [0001] The invention relates to the field of utilization of solid waste produced by circulating fluidized bed boilers in thermal power plants and the field of cement gelling materials, and specifically provides a sulfur-fixed ash cement and a preparation method thereof. Background technique [0002] With the increasing demand for electricity in my country, the development of thermal power generation enterprises is accelerating, especially in the northern provinces based on coal, and the number of circulating fluidized bed boiler generating units fueled by low-quality coal and coal gangue has been put into operation. Solid waste such as sulfur-fixing ash, sulfur-fixing slag and desulfurization gypsum is increasing year by year. However, due to the limitations of current scientific research and technology, the resource utilization level of this kind of solid waste is low, and open-air storage or landfill is still the main method. The transportation and storage ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B7/26
CPCC04B7/26Y02P40/10
Inventor 程芳琴邱瑞芳刘红宇尹维新薛芳斌石龙龙
Owner INNER MONGOLIA YILI JIDONG CEMENT CO LTD
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