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Process for producing fly ash steamed brick by using sintering machine desulfuration ash

A production process and desulfurization ash technology, applied in manufacturing tools, ceramic molding machines, clay processing equipment, etc., can solve problems such as the application is still in the research stage, and achieve the effect of reducing land occupation and environmental pollution

Inactive Publication Date: 2009-10-21
HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the calcium sulfite type desulfurization ash is discarded, and its application is still in the research stage.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] The present invention adopts the following components in parts by weight: 20 parts of fly ash, 5 parts of desulfurized ash, 0.1 part of lime, 0.1 part of gypsum, and 25 parts of aggregate. It is made by mixing 9 parts of water evenly, pressing and molding, standing for 3 hours, and curing with hot and humid steam at 50°C for 8 hours.

[0024] The desulfurization ash is the dry process and semi-dry process desulfurization ash of the steel plant sintering machine, and the 180-mesh square hole sieve residue is less than 4%, and the chemical composition of the desulfurization ash is calculated as: SiO 2 5%, CaO 30%, MgO 0.5%, Al 2 o 3 0.5%, SO 3 15%.

[0025] The water reducer is a naphthalenesulfonate or polycarboxylate water reducer, the water reducing rate is ≥ 15%, the pH value is 7-9, and the fluidity of the cement paste is 220mm, which meets the standard of GB8076 "Concrete Admixture" Require.

[0026] The gypsum is natural dihydrate gypsum, anhydrite, phosphogyp...

Embodiment 2

[0031] The present invention adopts the following components in parts by weight: 80 parts of fly ash, 20 parts of desulfurized ash, 6 parts of lime, 3 parts of gypsum, and 45 parts of aggregate. It is made by mixing 15 parts of water evenly, pressing and molding, standing for 4 hours, and curing with 100°C hot and humid steam for 12 hours.

[0032] The desulfurization ash is the dry process and semi-dry process desulfurization ash of the steel plant sintering machine, and the 180-mesh square hole sieve residue is less than 4%, and the chemical composition of the desulfurization ash is calculated as: SiO 2 5%, CaO 30%, MgO 0.5%, Al 2 o 3 0.5%, SO 3 15%.

[0033] The water reducer is a naphthalenesulfonate or polycarboxylate water reducer, the water reducing rate is ≥ 15%, the pH value is 7-9, and the fluidity of the cement paste is 220mm, which meets the standard of GB8076 "Concrete Admixture" Require.

[0034] The gypsum is natural dihydrate gypsum, anhydrite, phosphogyps...

Embodiment 3

[0039] The present invention comprises following preparation process steps:

[0040] (1) Preparation of composite additives: the following ingredients by weight and number are used: 50 parts of polycarboxylate water reducer, 30 parts of mirabilite, 25 parts of anhydrous sodium sulfate, 40 parts of instant sodium silicate, measured according to the proportion, mixed Grinding, the fineness is controlled to a 180-mesh square hole sieve and the sieve is less than or equal to 3.0%;

[0041] (2) Production of steam-cured bricks: the following parts by weight are used: 60 parts of fly ash, 25 parts of desulfurized ash, 10 parts of lime, 2 parts of gypsum, 5 parts of aggregate, and 1.0 part of compound additive. The production process is as follows: : Each material is measured in proportion and mixed, adding 12 parts of water by weight, mixed evenly, pressed and formed, left to stand for 4 hours, and then cured for 16 hours with hot and humid steam at 75°C.

[0042] The desulfurizati...

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Abstract

The invention relates to a process for producing a fly ash steamed brick by using sintering machine desulfuration ash. The fly ash steamed brick comprises the following raw materials in portion by weight: 20 to 80 portions of fly ash, 5 to 25 portions of desulfuration ash, 0.1 to 10 portions of lime, 0.1 to 4 portions of gypsum, 5 to 50 portions of aggregate, and 0 to 1.5 portions of composite assistant. A product is prepared by the processes of adding water and stirring, pressing and molding, keeping standing and steam curing. The process is used for producing the fly ash steamed brick by using the sintering machine desulfuration ash of a steel mill to totally or partially replace the lime and the gypsum, solves the problem of resource utilization of the sintering machine desulfuration ash of the steel mill; and the fly ash steamed brick produced by the sintering machine desulfuration ash has following performance test results: the breaking strength of the steamed brick is 2.5 to 4.0 MPa, the compressive strength is 10 to 20 MPa, the frost resisting property is qualified, and the carbonization coefficient is 0.80 to 0.95.

Description

technical field [0001] The invention relates to a technology for producing building materials by utilizing the desulfurization ash of the sintering machine in a steel plant by dry method and semi-dry method. Background technique [0002] SO emissions from the steel industry 2 Second only to thermal power industry and building materials industry, SO 2 It mainly comes from the sintering process, accounting for 65% to 93%, and the proportion is increasing year by year. The "Eleventh Five-Year" Plan for my country's national economic and social development clearly stated that by 2010, the total national sulfur dioxide emissions will be reduced by 10% compared with the end of the "Tenth Five-Year Plan", and the total emissions must be controlled at 22.95 million tons. The Chinese government has successively formulated strict regulations and standards for the discharge of sulfur dioxide pollutants, and many steel mills have installed desulfurization devices. Control SO in the p...

Claims

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Application Information

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IPC IPC(8): B28B3/00B28C7/04B28C1/16B28B11/24C04B28/14C04B18/08
CPCC04B28/021Y02W30/91C04B14/02C04B18/085C04B22/064C04B22/143C04B40/024C04B14/045C04B22/10C04B22/147C04B2103/302
Inventor 郭斌任爱玲赵风清张志国李倩李豪朱哲
Owner HEBEI UNIVERSITY OF SCIENCE AND TECHNOLOGY
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