CN1064256A

CN1064256A - Series modified powdered coal ash and treatment process thereof and application

Info

Publication number: CN1064256A
Application number: CN91106935A
Authority: CN
Inventors: 蒋兆广; 唐芝; 张莹; 张予苏
Original assignee: Individual
Current assignee: Individual
Priority date: 1991-02-12
Filing date: 1991-02-12
Publication date: 1992-09-09

Abstract

What the present invention provided is a kind of series modified powdered coal ash and treatment process and application.Series modified powdered coal ash has FS type, FA1 type, FA2 type flyash, and FS type flyash composition has original state dry powder coal ash, slag, FA1 type composition that original state dry powder coal ash, slag, dihydrate gypsum, water anhydrite, Wingdale are arranged; FA2 type composition has original state dry powder coal ash, slag, solubility hard water gypsum or contains the crystal water gypsum.Their treatment process are that the proportioning ratio is gone into mill in accordance with regulations, and grinding to the fineness length of side tails over less than 3% for the 0.08mm square hole sieve, and they can be used for producing common, slag, flyash coal ash silicate cement.

Description

Series modified powdered coal ash and treatment process thereof and application

What the present invention provided is a kind of series modified powdered coal ash and treatment process and application.Belong to building material technical field.

At present in manufacture of cement, use flyash to make cement mixture and produce ordinary Portland cement, Portland fly ash cement and Portland blast etc., its treatment process have two kinds substantially, one: the dry powder coal ash is mixed together grinding with certain proportion with cement clinker, gypsum etc. and becomes cement.Two, with the dry powder coal ash in advance grinding to certain fineness, wear into cement with certain proportion and cement clinker, gypsum powder mix again.These two kinds of treatment processs often make cement early strength not give full play to, thereby have limited the volume of mixing material.Can not improve soundness of cement effectively.

The objective of the invention is to the problem at above-mentioned existence, propose a kind of cement early strength that makes and give full play to, that improves soundness of cement gives treatment process and application thereof.Cement performance according to the silicate cement mineral, the composition of flyash and constitutional features, add a certain amount of admixture flyash is given processing, change its Chemical Composition and constitutional features, make it help improving soundness of cement, the excited cement early strength increases blending amount of mixture material, is beneficial to the later strength development.

Technical solution of the present invention:

The flyash technology of giving after the processing has three types, claim its series modified powdered coal ash it FS type, FA1 type, FA2 type are arranged.

1. the proportioning of FS type modified coal ash and treatment process:

Proportioning components (weight): original state dry powder coal ash 80～96%

Slag (water ratio is less than 10%) 4～20%

Treatment process: flyash and slag are gone into mill in proportion simultaneously, and grinding to fineness is that 0.08 millimeter square hole sieve of the length of side tails over less than 3%.

2. FA1 type modified coal ash proportioning and treatment process:

Proportioning components (weight)

Original state dry powder coal ash 60～95%

Slag (water ratio is less than 10%) accounts for 2～15%

Dihydrate gypsum accounts for 2～10%

Water anhydrite accounts for 0～10%

Wingdale accounts for 1～5%

Treatment process: will be crushed to particle diameter less than 5 centimetres gypsum and Wingdale, and mix with slag in proportion, and can go into mill to scale with original state dry powder coal ash after three days, grinding to fineness is that 0.08 millimeter square hole sieve of the length of side tails over less than 3%.

3. the proportioning of FA2 type modified coal ash and treatment process:

Proportioning components: original state dry powder coal ash accounts for 80～94%

Slag (water ratio is less than 3%) accounts for 4～10%

Solubility anhydrite or contain the crystal water gypsum and account for 2～10%

Treatment process: with original state dry powder coal ash, slag and gypsum in accordance with regulations the proportioning ratio go into mill, grinding to fineness is that 0.08 millimeter square hole sieve of the length of side tails over less than 3%

FS type, FA1 type and FA2 type flyash using method:

FS type, FA1 type and FA2 type flyash can be used for producing ordinary Portland cement, Portland blast, Portland fly ash cement.Their using method is looked the different of grog characteristic and cement crystalline substance, selects for use different modified coal ashs to make cement mixture, and modified coal ash, grog and other material are gone into to wear into cement in proportion together.When using modified coal ash, the gypsum consumption will suitably be adjusted, and makes that SO3 content is no more than national standard in the cement.

FS type, FA1 type and FA2 type flyash are to the suitability of different varieties cement.

1. ordinary Portland cement: select for use FA1 type and FA2 type flyash to be advisable below 15% of its consumption by mass of cement.

2. Portland blast: select the FS type for use, FA1 type and FA2 type flyash all can use below 15% of its consumption by mass of cement.

3. Portland fly ash cement: FA1 type and FA2 type flyash are comparatively suitable, also can use FS type flyash, but effect is not as preceding two kinds, below 15% of consumption by mass of cement.

Applying modified flyash is made the advantage of cement mixture:

1, improve the volume of blended material in the cement, adopt same production technique, produce with label cement, blending amount of mixture material on the original basis, can increase by 10%～15%(within national standard)

Can reduce the cement cost save energy significantly like this, improve the cement mill economic benefit.

2, improve strength of cement: in national standard, increase blending amount of mixture material, not only do not reduce strength of cement, and intensity is increased.

3, improve soundness of cement, shorten the cement shelf-time, quicken turnover of funds, particularly remarkable to the cement mill effect of producing clinker in vertical kiln.

4, increase blending amount of mixture material, increase hydrated calcium silicate content after the aquation, improve various performances of cement later stage.

5, enlarge the flyash application approach, reduce environmental pollution.

Embodiment:

1, modified coal ash is to the improvement of soundness of cement:

Selecting free calcium oxide content for use is that 6.3 shaft kiln clinker is tested, and with grog 55%FA1 type flyash 35% slag 5%, gypsum 5% powder mix is worn into cement, and recording sulfur trioxide content is 2.97, and stability is qualified when going out to grind.

2, mix blended material more and improve strength of cement.

The skillful material cement of 1. same shaft kiln production and the ordinary Portland cement strength ratio of mixing 15% FA1 type flyash be:

Skillful material cement: grog 95%, 5%, 28 day intensity of gypsum: resistance to compression 54.1MPa, anti-folding 7.5MPa

Ordinary Portland cement: grog 81%, gypsum 4%, 15%, 28 day intensity of FA1 type flyash, resistance to compression 57.5MPa, anti-folding 8.1MPa

The Portland blast of 2. same shaft kiln production and the strength ratio of mixing FS type, FA1 type fly-ash mine slag portland cement are.

Portland blast: grog 55%, slag 40%, 5%, 28 day intensity of gypsum, resistance to compression 43.5MPa, anti-folding 7.1MPa

Mix the Portland blast of FS type flyash: grog 40%, slag 40%, 15%, 28 day intensity of FS type flyash, resistance to compression 44.0MPa, anti-folding 8.0MPa

Mix the Portland blast of FA1 type flyash: grog 40%, slag 40%, FA1 type flyash 15%, 5%, 28 day intensity of gypsum, resistance to compression 45.9MPa, anti-folding 8.1MPa

Claims

1, series modified powdered coal ash is characterized in that the proportioning components of FS type modified coal ash has original state dry powder coal ash weight to account for 80～96%, and slag (water ratio is less than 10%) weight accounts for 4～20% (weight and be 100%); FA1 type modified coal ash proportioning components has original state dry powder coal ash weight to account for 60～95%, slag (water ratio is less than 10%) weight accounts for 2～15%, dihydrate gypsum weight accounts for 2～10%, and water anhydrite weight accounts for 0～10%, and Wingdale weight accounts for 1～5% (weight and be 100%); FA2 type modified coal ash proportioning components has original state dry powder coal ash weight to account for 80～94%, and slag (water ratio is less than 3%) weight accounts for 4～10%, solubility hard water gypsum or contain crystal water gypsum weight and account for 2～10% (weight and 100%).

2, series modified powdered coal ash, the treatment process that it is characterized in that FS type modified coal ash be with flyash and slag in accordance with regulations the ratio of proportioning go into abrasive dust simultaneously to be milled to fineness be that length of side 0.08mm square hole sieve tails over less than 3%; The treatment process of FA1 type modified coal ash is glass to be broken to particle diameter mix with slag in proportion less than 5 centimetres gypsum and Wingdale, after three days can with original state dry powder coal ash in accordance with regulations the proportioning ratio go into mill, grinding to fineness is that length of side 0.08mm square hole sieve tails over less than 3%; The treatment process of FA2 type modified coal ash be with original state dry powder coal ash, slag and gypsum in accordance with regulations the proportioning ratio go into mill, grinding to fineness is that length of side 0.08mm square hole sieve tails over less than 3%.

3, series modified powdered coal ash, it is characterized in that FS type, FA1 type, FA2 type modified coal ash can be used for producing ordinary Portland cement, Portland blast, Portland fly ash cement, ordinary Portland cement is selected below 15% of its consumption by mass of cement of FA1 type FA2 type modified coal ash for use, Portland blast is selected FS type, FA1 type, FA2 type modified coal ash, below 15% of its consumption by mass of cement for use; Portland fly ash cement is selected FA1 type, FA2 type modified coal ash for use, below 15% of its consumption by mass of cement.