CN1089245A

CN1089245A - Method with talcum or molasses as cement grinding aid

Info

Publication number: CN1089245A
Application number: CN 92101970
Authority: CN
Inventors: 白显明; 邵中军
Original assignee: INST OF CEMENT SCIENCE CHINESE ACADEMY OF BUILDING MATERIAL SCIENCE
Current assignee: INST OF CEMENT SCIENCE CHINESE ACADEMY OF BUILDING MATERIAL SCIENCE
Priority date: 1992-03-25
Filing date: 1992-03-25
Publication date: 1994-07-13

Abstract

The present invention relates to a kind of method with talcum or molasses as cement grinding aid, the talcum volume is 0.1～1.0% of a cement clinker, and the molasses volume is 0.01～0.1% of a cement clinker weight; Talcum is a natural mineral, molasses are sugar waste, more than two kinds of material values cheap, ample supply and prompt delivery are made grinding aid with it, economize on electricity 17～20%, and the intensity in cement each length of time all has raising, and molasses are made slag cement grinding aids forever, and more used grinding aid was all good than in the past for effect, can economize on electricity 20%, solve long-standing slag cement grinding aid problem.

Description

Method with talcum or molasses as cement grinding aid

The invention relates to the method for using talcum or molasses as cement grinding aid, belong to the cement grinding technology.

Energy-conservation is the key subjects of current manufacture of cement, in the Cement industry power consumption total amount, power consumption accounts for 18.22%, wherein pulverizing cement and raw material electricity consumption account for 2/3 of power consumption total amount, improve grinding machine and no doubt can save power consumption, but increased facility investment and process complexity, factory is difficult to bear often, and adopt grinding aid is the most simple, adopts suitable grinding aid can improve crush efficiency about 20%.Research on cement additive and using abroad just began as far back as the thirties, carried out extensive work, had applied for many patents, domesticly just studied and used from the fifties.The grinding aid of studying and using both at home and abroad is polyvalent alcohol and ethanolamines Chemicals mostly at present, ten kinds of grinding aids of two series of N, S that the applicant and Tianjin light industry are developed also belong to this type of, the most costlinesses that are worth of this class grinding aid, the source shortage, and cement to the admixture blended material, grinding-aid effect is not remarkable, to cement performance do not have improve or the improvement effect little, thereby generally apply and be restricted.

Task of the present invention is the problem that exists at above-mentioned grinding aid technology, seeks with low costly, and the source is sufficient, can grinding aid can improve the grinding aid of cement performance again, in order to reducing power consumption of the mill, and the raising cement quality.

The essence of patent application of the present invention is that talcum or molasses are mixed in the grog, with grog grinding together, below talcum and molasses is as follows as the principle and the using method division of grinding aid:

1. the steatitic chemical constitution is Mg ₃[Si ₄O ₁₀] (OH) ₂, often containing elements such as small amounts of iron, aluminium, the design of making grinding aid with talcum is based on the steatitic physicals and chemical ingredients all is fit to do grinding aid; Talcum is white or light green, color to cement, especially white cement or colored cement do not have disadvantageous effect, and it has soapy feeling, and hardness is low, and can constitute the particle wrap film on material surface, can weaken the power that attracts each other of material particles, weaken polymerization, the grinding aid effect is arranged. the steatitic chemical constitution is a kind of moisture silicic acid mineral, the hydration reaction that participates in cement can play the enhancing modified effect, and each age strength of cement all is significantly increased.When using talcum to make grinding aid, before going into mill it is broken into fritter for ease of metering, volume is 0.1～1.0% of a grog, also can mix fragmentation earlier with the gypsum that should add, and together goes into mill.

2. molasses are the byproduct waste molasses of sugar refinery, proportion is 1.3～1.6, can be the cement water reducing agent that raw material and lime are made into also in order to molasses, the waste molasses main component is a sucrose, glucose or fructose and less water, also has organic non-sugar of＜10%, the cement water reducing agent that waste molasses and lime are mixed with under certain condition, its main component is the lime saccharate complex compound, the sugar of monose calcium complex and residue trace, molasses can be as cement grinding aid, the mechanism that can improve cement performance again is to contain have an appointment 40～60% reducing sugar and Nulomoline in the molasses, and sucrose is the poly-hydroxy carbohydrate, belongs to nonionic surface active agent.The mechanism of action-film hypothesis theory according to grinding aid, because of nonionic surface active agent salience(-cy) not itself, so do not select adsorption, no matter the polarity of the unsaturated valence link on fine particle surface how, all than the easier formation monomolecular adsorption of positive and negative ionogenic surfactant film, thereby in general, the grinding aid effect of nonionic surface active agent is better than cationic and aniorfic surfactant, therefore says that molasses are a kind of good grinding aids.In addition, molasses can also improve the hydrate state of cement except that having tangible grinding-aid effect, improve pore structure of cement stone, and the physical and mechanical property of cement is improved, and when using molasses as cement grinding aid, the present patent application adopts two kinds of methods.

(1) proportion be 1.3～1.6 molasses volume be cement clinker heavy 0.01～0.1%, the method for mixing is the aqueous solution with above-mentioned molasses thin up to 5～30%, add in the grinding machine with grog with mill;

(2) making the molasses cement water reducing agent with above-mentioned molasses and lime reaction, be the powder powder, is a kind of commercially available prod, with this powder water dissolution, adds in the grinding machine, and with grog mill together, incorporation also is 0.01～0.10% of a cement clinker.

The experiment proved that for obtaining better grinding aid, modified effect, grind silicate cement, ordinary Portland cement preferably adopts the talcum grinding aid; Preferably adopt the molasses grinding aid if grind slag cement.

Be the application's embodiment below:

Under same test conditions, add with the cement fineness that does not add grinding aid and reach 310 ± 10m ²The used grinding time of/Kg sees Table 1:

Under same grinding condition, grind, add grinding aid and do not add silicate cement, the slag cement grinding aid of grinding aid and improve effect and see Table 2.

The advantage of the art of this patent and effect such as following:

1. talcum and molasses all are with low cost, the raw material of ample supply and prompt delivery, and composition is relatively stable. Molasses are industrial fertilizer, make grinding aid with molasses, grind the required expense of cement per ton and be no more than 0.2 yuan, talcum is the very wide a kind of natural minerals that distributes, and price is no more than grog and gypsum, makes grinding aid with it, not only playing grinding aid does, with economize on electricity 17～20%, and obvious modifying function is arranged, each age strength has raising.

2. external 3 days resistance to compression 30～38MPa of Portland cement, 28 days resistance to compression 62～64MPa, and the average label of grog in 90 years 66 big-and-middle cement plants of China is 59MPa. The reason that China's strength of cement is more on the low side than external cement, partially slightly relevant with cement fineness. External cement fineness generally tails at 1.0%() about, domestic cement fineness is generally 3～4%(and tails over), even higher, adopt talcum and molasses as grinding aid, can make the portland cement quality of domestic production reach the advanced level of same kind of products at abroad, the cement made in China foreign exchange earning will obtain obvious techno-economic effect.

3. China produces cement, and major part is mixed the slag mixed material cement, accounts for cement total output 2/3, slag cements does not find a kind of effective grinding aid so far, and it is fine that the present invention makes slag cements grinding aid effect with molasses, has solved the grinding aid problem of slag cements.

Claims

1, a kind of method with talcum or molasses as cement grinding aid is characterized in that:

(1) the talcum volume be cement clinker heavy 0.1～1.0%, the method for mixing is talcum to be broken into fritter add in the grinding machine and grog grinding together;

(2) proportion be 1.3～1.6 molasses volume be cement clinker heavy 0.01～0.1%, the method for mixing is the aqueous solution with above-mentioned molasses thin up to 5～30%, add in the grinding machine with grog with mill; The perhaps Powdered cement water reducing agent made from molasses, volume also be cement clinker heavy 0.01～0.1%, the method for mixing is for Powdered water reducer water dissolution, add in the grinding machine with grog with grinding.

2,, it is characterized in that the described steatitic method of mixing is that the talcum elder generation that should add is broken with the gypsum mixing that should add, with grinding together with grog in the adding grinding machine according to the described method of claim 1 with talcum or molasses as cement grinding aid.