Fly ash for cement production or concrete admixture, and production technology thereof

Abstract

The invention discloses a fly ash for cement production or concrete admixture. The fly ash for cement production or concrete admixture comprises 90-98% of original fly ash, 1-10% of a combustion improver and 0.1-10% of an adhesive. The fly ash for cement production or concrete admixture has the following advantages: 1, a mineral adhesive or an organic adhesive is selected as an auxiliary raw material, so a problem that the original fly ash cannot be molded is solved; 2, the combustion of residual carbon in the original fly ash is realized against the problems of poor original fly ash permeability, no pass-through of combustion air and no discharge of flue gas; 3, the residual carbon in the original fly ash is used as a fuel, so energy is saved, and environmental protection is facilitated; 4, secondary emission of solid wastes is reduced; 5, raw materials and the auxiliary raw material selected in the invention have wide sources, and have ample supply on the market; and 6, a device selected in the invention is mature and reliable, and has strong versatility.

Description

technical field

[0001] The invention relates to a fly ash used as a mixing material in cement production or as an admixture when mixing cement concrete and mortar. Background technique

[0002] Fly ash is a kind of industrial solid waste. It is the main solid waste discharged from coal-fired power plants or power boilers. It is the fine ash collected from the flue gas after pulverized coal combustion.

[0003] my country's historical reserves of fly ash amounted to 12 billion tons. Calculated according to the national average ash discharge level, every increase of 10MW installed capacity will increase the discharge of nearly 10,000 tons of fly ash every year. In 2009, China's output of fly ash reached 375 million tons, equivalent to more than twice the total amount of urban domestic waste in China that year, and its volume could reach 424 million cubic meters. It is equivalent to filling a water cube every day.

[0004] If a large amount of fly ash is not treated, it will...

Examples

Embodiment 1

[0038] The preparation of the fly ash as admixture in the cement production of embodiment 1

[0039] In this embodiment, fly ash is prepared from the raw ash of a power plant in Cheng'an County, Handan City, Hebei Province. The main component of the raw ash of fly ash is: SiO 2 50.6%, Al 2 o 3 27.2%, Fe 2 o 3 7.0%, SO 3 0.3%, loss on ignition 8.2%; binder is bentonite produced in Yongnian County, Handan City; combustion enhancer is Henglitai brand coal-saving combustion enhancer produced in Langfang. The mixing ratio of each raw material is 91.0% of raw fly ash, 8.8% of binder, and 0.2% of combustion enhancer. Mix the above three raw materials evenly, press them into Ф10mm×15mm pellets with a 290-type static pressure ball, add them to a 0.6m×1.2m×2.5m square shaft kiln, and bake at 800±30°C for 1 hour. The fired pellets are ground with TCQ-750*900 ball mill for 0.5 hours, and the quality of fly ash is inspected as follows: loss on ignition 0.8%, water content 0.3%, sulfu...

Embodiment 2

[0040] Embodiment 2 The preparation of I level mixing concrete and mortar with fly ash finished product

[0041] This embodiment utilizes the raw ash of the ash storage field in Daqiao Town, Dongjiao, Jinan City, Shandong Province to prepare fly ash. The main component of the fly ash raw ash is: SiO 2 50.6%, Al 2 o 3 27.1%, Fe 2 o 3 7.1%, SO 30.4%, CaO 3.3%, loss on ignition 8.8%, moisture 12.1%. The adhesive is industrial-grade sodium carboxymethylcellulose CMC produced in Leling City, Dezhou, and the combustion enhancer is HY-type multifunctional high-efficiency coal-burning combustion enhancer produced in Linyi City, Shandong Province. The blending ratio of each raw material is 99.5% of raw fly ash, 0.3% of binder, and 0.2% of combustion enhancer. Mix the above three raw materials evenly, form balls with a disc, put them into a small open hearth furnace, and bake at 650-850°C for 2.5 hours. After firing, the pellets were ground with a ball mill for 1 hour, and the qu...

Embodiment 3

[0042] Embodiment 3 I level mixes concrete and the preparation of fly ash finished product for mortar

[0043] In this embodiment, the wet-discharged fly ash from the No. 2 ash yard of Fenyi Power Plant in Jiangxi Province is used as raw ash to prepare fly ash. The main components of the raw ash are: SiO 2 50.3%, Al 2 o 3 25.1%, Fe 2 o 3 8.1%, CaO 4.3%, SO 3 1.3%, loss on ignition 11.3%. The adhesive uses fulvic acid produced in Pingxiang, Jiangxi, and the combustion aid uses HZ-618 combustion-supporting and coal-saving agent produced in Changsha. The blending ratio of each raw material is 92.5% of raw fly ash, 7% of binder, and 0.5% of combustion enhancer. Mix the above three raw materials evenly, form into balls with a double-roller briquetting machine, put them into a small open hearth furnace, and bake at 750±30°C for 1 hour. The fired pellets are ground with a ball mill for 1 hour, and the quality of the finished fly ash is inspected as follows: 3.6% sieved by a sq...

technical field

[0001] The invention relates to a fly ash used as a mixing material in cement production or as an admixture when mixing cement concrete and mortar. Background technique

[0002] Fly ash is a kind of industrial solid waste. It is the main solid waste discharged from coal-fired power plants or power boilers. It is the fine ash collected from the flue gas after pulverized coal combustion.

[0003] my country's historical reserves of fly ash amounted to 12 billion tons. Calculated according to the national average ash discharge level, every increase of 10MW installed capacity will increase the discharge of nearly 10,000 tons of fly ash every year. In 2009, China's output of fly ash reached 375 million tons, equivalent to more than twice the total amount of urban domestic waste in China that year, and its volume could reach 424 million cubic meters. It is equivalent to filling a water cube every day.

[0004] If a large amount of fly ash is not treated, it will...

Examples

Embodiment 1

[0038] The preparation of the fly ash as admixture in the cement production of embodiment 1

[0039] In this embodiment, fly ash is prepared from the raw ash of a power plant in Cheng'an County, Handan City, Hebei Province. The main component of the raw ash of fly ash is: SiO 2 50.6%, Al 2 o 3 27.2%, Fe 2 o 3 7.0%, SO 3 0.3%, loss on ignition 8.2%; binder is bentonite produced in Yongnian County, Handan City; combustion enhancer is Henglitai brand coal-saving combustion enhancer produced in Langfang. The mixing ratio of each raw material is 91.0% of raw fly ash, 8.8% of binder, and 0.2% of combustion enhancer. Mix the above three raw materials evenly, press them into Ф10mm×15mm pellets with a 290-type static pressure ball, add them to a 0.6m×1.2m×2.5m square shaft kiln, and bake at 800±30°C for 1 hour. The fired pellets are ground with TCQ-750*900 ball mill for 0.5 hours, and the quality of fly ash is inspected as follows: loss on ignition 0.8%, water content 0.3%, sulfu...

Embodiment 2

[0040] Embodiment 2 The preparation of I level mixing concrete and mortar with fly ash finished product

[0041] This embodiment utilizes the raw ash of the ash storage field in Daqiao Town, Dongjiao, Jinan City, Shandong Province to prepare fly ash. The main component of the fly ash raw ash is: SiO 2 50.6%, Al 2 o 3 27.1%, Fe 2 o 3 7.1%, SO 30.4%, CaO 3.3%, loss on ignition 8.8%, moisture 12.1%. The adhesive is industrial-grade sodium carboxymethylcellulose CMC produced in Leling City, Dezhou, and the combustion enhancer is HY-type multifunctional high-efficiency coal-burning combustion enhancer produced in Linyi City, Shandong Province. The blending ratio of each raw material is 99.5% of raw fly ash, 0.3% of binder, and 0.2% of combustion enhancer. Mix the above three raw materials evenly, form balls with a disc, put them into a small open hearth furnace, and bake at 650-850°C for 2.5 hours. After firing, the pellets were ground with a ball mill for 1 hour, and the qu...

Embodiment 3

[0042] Embodiment 3 I level mixes concrete and the preparation of fly ash finished product for mortar

[0043] In this embodiment, the wet-discharged fly ash from the No. 2 ash yard of Fenyi Power Plant in Jiangxi Province is used as raw ash to prepare fly ash. The main components of the raw ash are: SiO 2 50.3%, Al 2 o 3 25.1%, Fe 2 o 3 8.1%, CaO 4.3%, SO 3 1.3%, loss on ignition 11.3%. The adhesive uses fulvic acid produced in Pingxiang, Jiangxi, and the combustion aid uses HZ-618 combustion-supporting and coal-saving agent produced in Changsha. The blending ratio of each raw material is 92.5% of raw fly ash, 7% of binder, and 0.5% of combustion enhancer. Mix the above three raw materials evenly, form into balls with a double-roller briquetting machine, put them into a small open hearth furnace, and bake at 750±30°C for 1 hour. The fired pellets are ground with a ball mill for 1 hour, and the quality of the finished fly ash is inspected as follows: 3.6% sieved by a sq...

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