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Method for preparing hydraulic cementing material by utilizing sulfur fixation ash

A technology of hydraulic gelling and cementitious materials, which is applied in the direction of cement production, etc., can solve the problems of poor practicability, high cost, and high production cost, and achieve the effects of increasing strength, eliminating expansibility, and reducing cracks

Inactive Publication Date: 2012-08-01
SOUTHWEAT UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the strength produced by hydration of the material is high, the cost is high
It is self-evident that the cost of cement-containing cementitious materials is high; cement-free cementitious materials are mainly prepared from scarce resources such as fly ash and slag, and the production cost is also high and the practicability is poor

Method used

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  • Method for preparing hydraulic cementing material by utilizing sulfur fixation ash
  • Method for preparing hydraulic cementing material by utilizing sulfur fixation ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A kind of method utilizing sulfur-fixed ash to prepare hydraulic cementitious material, comprises the following steps:

[0035] (1) Raw material grinding: Grinding raw materials such as sulfur-fixed ash (that is, circulating fluidized bed coal-fired sulfur-fixed ash, the same below), quicklime, etc., so that the fineness of sulfur-fixed ash is d 50 =14μm, lime fineness 80μm standard sieve residue is 10%;

[0036] Under laboratory conditions, the raw materials are all ground in the SM-500 ball mill, and the ratio of material to ball is 1:20, the same as the following;

[0037] The main chemical composition and mass percentage of the sulfur-fixing ash used are: SiO 2 37%, Al 2 o 3 14%, Fe 2 o 3 12%, CaO19%, SO 3 14%, f-CaO4%, the same below;

[0038] The effective calcium oxide mass percentage content of quicklime is 84.2%, and the sieve residue of 80 μm standard sieve is 10%;

[0039] (2) Ingredients: take fineness d 50 14 μm sulfur-fixed ash, according to the m...

Embodiment 2

[0044] A kind of method utilizing sulfur-fixed ash to prepare hydraulic cementitious material, comprises the following steps:

[0045] (1) Raw material grinding: Grinding the coal-fired sulfur-fixed ash in a circulating fluidized bed so that the fineness of the sulfur-fixed ash is d 50 =14μm;

[0046] (2) Ingredients: take fineness d 50 14μm sulfur-fixed ash, according to sulfur-fixed ash: CaSO 4 · 2H 2 O is a mass ratio of 100:2, and the raw materials are sulfur-fixed ash and CaSO 4 · 2H 2 O;

[0047] (3) Mixing of raw materials: the sulfur-fixed ash and CaSO 4 · 2H 2 O mixing and stirring to make it fully mixed evenly to obtain a gelled material. Under laboratory conditions, due to CaSO 4 · 2H 2 The amount of O is small, first divide the sulfur-fixing ash into 5 equal parts, and then mix with CaSO 4 · 2H 2 After O mixing, then slowly dry the mixture in a mortar mixer for 3 minutes;

[0048] (4) Storage: Seal and store the mixed materials in a dry environment. T...

Embodiment 3

[0051] A kind of method utilizing sulfur-fixed ash to prepare hydraulic cementitious material, comprises the following steps:

[0052] (1) Raw material grinding: Grinding the coal-fired sulfur-fixed ash in a circulating fluidized bed so that the fineness of the sulfur-fixed ash is d 50 =14μm;

[0053] (2) Ingredients: take fineness d 50 14μm sulfur-fixing ash, according to sulfur-fixing ash: Na 2 SO 4 The mass ratio is 100:1.5, and the raw materials sulfur-fixing ash and Na 2 SO 4 ;

[0054] (3) Raw material packaging: due to Na 2 SO 4 The particles are crystalline, so the sulfur-fixed ash and Na 2 SO 4 Packaged separately, during use, Na 2 SO 4 Dissolve in water first, and then mix with sulfur-fixing ash for use. The prepared slurry is a hydraulic cementitious material;

[0055] (4) Storage: Store the packaged materials tightly in a dry environment.

[0056] The physical properties of the cementitious material were tested according to the method of cement physica...

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Abstract

The invention discloses a method for preparing a hydraulic cementing material by utilizing sulfur fixation ash. The method is characterized by comprising the following steps of grinding raw materials, namely grinding the sulfur fixation ash serving as a raw material until the fineness (d50) of the sulfur fixation ash is less than or equal to 14 mu_m, and grinding calcined lime serving as another raw material until the fineness of the calcined lime is 80 mu_m and the screening residue of a standard screen is less than or equal to 10 percent; burdening, namely taking the raw materials according to a proportion that every 100 parts by weight of sulfur fixation ash is doped with 3 to 14 parts by weight of calcined lime or slaked lime or 1 to 3 parts by weight of CaSO4.2H2O; mixing the raw materials, namely uniformly mixing and stirring the raw materials, thus obtaining the hydraulic cementing material. According to the method, waste is turned into wealth, so that environment pollution is reduced; and the hydraulic cementing material prepared by the method can be used as a component of cement concrete, artificial aggregate, a steamed building block, a filling structure and a roadbed and has the advantage of high performance.

Description

technical field [0001] The invention belongs to building materials, and relates to a method for preparing a cementitious material that can be used for cement concrete, artificial aggregate, steam-cured block, structural filling, and roadbed by using the waste discharged from the flue of a circulating fluidized bed boiler—sulfur-fixed ash. In particular, it relates to a method for preparing hydraulic cementitious materials by utilizing sulfur-fixed ash. Background technique [0002] Circulating fluidized bed coal-burning sulfur-fixing ash (hereinafter referred to as sulfur-fixing ash) refers to sulfur-containing coal mixed with a sulfur-fixing agent (usually limestone) in a certain proportion and then burned in a fluidized bed boiler at 850-900 ° C to fix sulfur from Solid waste dust from the flue. With the development of fluidized bed coal combustion technology, the emission of sulfur-fixed ash is increasing rapidly. At present, the comprehensive utilization of ordinary as...

Claims

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Application Information

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IPC IPC(8): C04B7/26
CPCY02P40/10
Inventor 严云夏艳晴胡志华陈雪梅杨林
Owner SOUTHWEAT UNIV OF SCI & TECH
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