CN100368333C

CN100368333C - Compound cement grinding aid and its production method

Info

Publication number: CN100368333C
Application number: CNB2005100430265A
Authority: CN
Inventors: 王明贵; 宁继华
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-07-25
Filing date: 2005-07-25
Publication date: 2008-02-13
Anticipated expiration: 2025-07-25
Also published as: CN1903768A

Abstract

The present invention discloses a cement grinding aid and its production method. All the component contents in said cement grinding aid are as follows: (by wt%) 33-37% of CaO, 32-36% of Al2O3, 6-8% of SiO2, 16-18% of SO3 and 9-11% of CO(NH2)2. Its production method includes the following steps: using (by weight portion) 7 portions of calcium sulfate, 13 portions of bauxitic clay, 62 portions of limestone, 11 portions of clay and 7 portions of raw coal, grinding them and mixing them, high-temperature calcining, breaking to obtain granules whose grain size is less than or equal to 5mm, finally spraying urea liquor on the granules, homogenizing and packaging so as to obtain the invented product. It can greately raise early strength of cement.

Description

Composite cement grinding aid and production method thereof

Technical field

The invention belongs to the cement manufacturing technology, what be specifically related to is the production method of a kind of cement grinding aid and grinding aid.

Background technology

Along with new dry process rotary kiln and ultra-fine mill production technique The application of new technique and universal, the high-quality portland cement clinker mineral phase structure densification of being produced, the problem of grindability difference becomes increasingly conspicuous, the grinding phenomenon appearred in superfine pulverizing in a large number, cause the cement powder particle separation, cement mesosilicic acid salt grog and the Reasonable Parameters of mixing industrial residue superfine powder grain composition have been destroyed, cause grinding to produce full mill, slimeball, wall built-up and influence the mill efficiency of ultra-fine mill, bring lateral reactivity performance poor effect in clinker strength and the industrial residue simultaneously, it is comparatively general with the resource phenomenon to waste energy.

Be used as blending amount of mixture material with industrial residue in the present domestic manufacture of cement and on average reach 15～25%, according to test, industrial residue fine grinding specific surface area reaches 300m ²During/kg the left and right sides, the blast-furnace slag aquation could produce about 90 days and the respective strengths of Portland clinker aquation in the time of 28 days, and flyash then need just can reach corresponding strength in about 180 days.That is to say that this cement exists the problem that early strength is grown slowly, delay time of coagulation.

Though at present some cement grinding aids have appearred in domestic market,, the product that has can only grinding aid, and the product that has only lays particular emphasis on and early excites by force, and performance is single.Though the grinding aid product performance that U.S. Gray's Si building material product company produces is more comprehensive, because it has certain selectivity to Portland clinker component and industrial residue component, its effect neither be very good.

Summary of the invention

The objective of the invention is to propose a kind of existing grinding aid performance has early strong excitating performance again, and can be widely used in the production method of cement grinding aid and this product of fusion industrial residue in the manufacture of cement.

The technical scheme that realizes above-mentioned purpose is:

1. each component concentration is by weight percentage in the cement grinding aid:

CaO 33-37

Al ₂O ₃ 32-36

SiO ₂ 6-8

SO ₃ 16-18

CO(NH ₂) ₂ 9-11

2. the production force method of cement grinding aid:

Get 7 parts in calcium sulfate, 13 parts of bauxitic clays, 62 parts in Wingdale, clay by weight and be raw material for 11 parts, the auxilliary raw coal that adds is fuel for 7 parts, and making the specific surface table through grinding is 250m ²The mixture of/kg adds water again and makes Φ≤15mm pellet, then through 600～800 ℃ of high-temperature calcinations, pass through fragmentation again, make its particle that becomes Φ≤5mm, the aqueous solution of urea that will account for material total amount 10% at last evenly sprays on the grog particle, and the homogenizing encapsulation gets final product.

Cement grinding aid of the present invention has the effect of two aspects, the one, utilize amide salt can suppress cement powder particulate separation in the super fine powder mill effectively based on carbonyl diamine, slimeball, wall built-up and electrostatic adhesion phenomenon have been avoided, the milling capacity of grinding machine is improved, increased the specific surface area of fine powder, it is more reasonable to make that Portland clinker and industrial residue powder particles grating distribute, and has promoted the physical excitation effect in the material; The 2nd, can induce and activate potential activity in the industrial residue rapidly, it is the early strength skeleton of principal character that the mineral intermediate that is activated is generated with the ettringite, increase contact area, accelerated degree of hydration, thereby make the setting and harden time can shift to an earlier date 1～3 hour, promptly have strong, fast with fixed attention, the fast chemical action of hydration rate morning.

In cement grinding, cement per ton evenly adds 0.5～1.5% above-mentioned cement grinding aid, can obtain following grinding-aid effect:

1, improves mill hourly output 25～40%;

2, improve the specific surface area 50～100m of cement ²/ kg;

3, increase substantially cement early strength, later strength is promoted fast, intensity can improve more than 25% in three days, intensity improved more than 15% in 28 days, can shorten 1～3 hour time of coagulation, effectively eliminate the free calcium oxide in the grog, the drying shrinkage, dense water, freeze-thaw resistance, impermeability, anti-carbonization ability, corrosion resistance, cement color and luster etc. of cement are effectively improved;

4, increase considerably the blended material addition content.Reach at clinker strength under the situation of 50MPa, the slag addition content can reach 50～70%; Addition content can reach 25～40% when slag, flyash, coal gangue etc. were singly mixed; Mix and to reach 35～50% when mixing again.Under this addition content, but stably manufactured 32.5R class g cement.When clinker strength reaches 55MPa, mix industrial residue according to above-mentioned addition content, can guarantee to produce 42.5R cement, and improve cement output more than 25%.

5, reduce the manufacture of cement cost.1 ton of cement of every production can be saved raw coal 42kg mark coal/t, lime 450kg/t, is stained with 66kg/t, conservation of power 18KWh/t, reduces about 40 yuan/ton of manufacture of cement costs altogether.

Embodiment

The present invention is described in further detail below in conjunction with embodiment:

Embodiment 1

Getting calcium sulfate, 130Kg bauxitic clay, 620Kg Wingdale, the 110Kg clay that weight is 70Kg is raw material, and auxilliary to add the 70Kg raw coal be fuel, and grinding into the specific surface table through grinding machine is 250m ²The mixture of/kg, spray water again, make Φ≤15mm pellet, then pellet is packed in the machine shaft kiln through 600～800 ℃ of high-temperature calcinations, after the cooling through fragmentation, make its particle that becomes Φ≤5mm, the aqueous solution of urea that will account for material total amount 10% at last evenly sprays on the grog particle, can become the cement grinding aid of following each component concentration index after the homogenizing:

Each component concentration is by weight percentage in the cement grinding aid:

CaO 35

Al ₂O ₃ 34

SiO ₂ 7

SO ₃ 17

CO(NH ₂) ₂ 10。

Embodiment 2

Get dihydrate gypsum 75Kg, bauxitic clay 140Kg, Wingdale 650Kg, clay 10Kg are raw material, being aided with raw coal 80Kg is fuel, with its mixing, making the specific surface table through Φ 1.5 * 5.7m grinding machine grinding is 250m ²The raw material of/kg.Make≤the 15mm pellet by pre-watering granulation, press 600～800 ℃ of high-temp combustions through Φ 2.5 * 8.5M machine shaft kiln, it is the sulphoaluminate cement clinker of essential mineral composition that the cooling back forms with anhydrous calcium sulphoaluminate, tricalcium aluminate and Dicalcium Phosphate (Feed Grade), through Φ 500 vertical shaft crusher in crushing be≤5mm particle grog again, the aqueous solution of urea that will account for material total amount 10% at last evenly sprays on the grog particle, can become the cement grinding aid of following each component concentration index after the homogenizing:

CaO 34-36

Al ₂O 33-35

SiO ₂ 6-8

SO ₃ 16-18

CO(NH ₂) ₂ 9-11。

Claims

1. composite cement grinding aid is characterized in that each component concentration is by weight percentage:

CaO 33-37

Al ₂O ₃ 32-36

SiO ₂ 6-8

SO ₃ 16-18

CO(NH ₂) ₂?9-11。

2. according to the production method of the described cement grinding aid of claim 1, it is characterized in that: get 7 parts in calcium sulfate, 13 parts of bauxitic clays, 62 parts in Wingdale, clay by weight and be raw material for 11 parts, the auxilliary raw coal that adds is fuel for 7 parts, and making the specific surface table through the grinding machine grinding is 250m ²The mixture of/kg adds water again and makes Φ≤15mm pellet, then through 600～800 ℃ of high-temperature calcinations, pass through fragmentation again, make its particle that becomes Φ≤5mm, the aqueous solution of urea that will account for material total amount 10% at last evenly sprays on the grog particle, and the homogenizing encapsulation gets final product.