CN100379701C

CN100379701C - Method for producing cement using desulfurized gypsum and fine coal ash

Info

Publication number: CN100379701C
Application number: CNB2005101266272A
Authority: CN
Inventors: 韦柳青; 江学艺
Original assignee: Individual
Current assignee: Individual
Priority date: 2005-12-02
Filing date: 2005-12-02
Publication date: 2008-04-09
Anticipated expiration: 2025-12-02
Also published as: CN1865180A

Abstract

The present invention belongs to a method for producing cement, which has the technical scheme that main wastes of desulphurization gypsum and pulverized coal ash from heat-engine plants are used as raw materials, and the cement is prepared from the components of the proportion by weight: 35 to 50 of pulverized coal ash, 45 to 53 of calcium oxide and 5 to 20 of desulphurization gypsum which are send into a ball mill and are pulverized into powder by a screen with 320 to 500 meshes after being measured and proportioned, the powder is packaged and is stored for 28 to 45 days, and the cement is produced. The present invention has the advantages of no need of cement clinker used as raw materials, no need of calcination, simple process and low production cost; the present invention is suitable for large-scale industrialized production.

Description

Utilize desulfurated plaster and flyash to produce the method for cement

Technical field

The present invention relates to a kind of Cement Production method made from the desulfurated plaster and the flyash of power plant's discharge for building.

Background technology

Desulfurated plaster and flyash all are the byproducts after thermal power plant's primary pollution source is handled, and the annual production of these two byproducts of general thermal power plant is all more than 200,000 tons.Up to the present, people generally produce flyash brick with flyash, also there is human flyash to produce cement, a kind of " producing the method for cement with high-calcium fly ass " once disclosed as Chinese CN87100904 application for a patent for invention, this method is to mix the latent hydraulicity material or the pozzolanic materials of 5%～30% fine grinding in levigated cement clinker and high-calcium fly ass, and it will be used a considerable amount of cement clinkers and produce cement.This is just the same just like convert low alcohol with high wine, if there is not cement clinker, this method can't be produced cement.Other application such as CN88102201.2 number " compound method of high-strength special pulverized fuel ash cement and compound thereof early ", mainly by Portland clinker 60～80%, flyash 20～40%, hydrofluoric acid dehydrated gyp-2～8%, yellow soda ash 0.5～2.5% is mixed into and grinds, and it also will use a considerable amount of cement clinkers.CN90106402.5 number " portland cement using cryogenic powdered coal dust " formed by grog, flyash, three kinds of mixing of materials of gypsum.Three kinds of proportion of raw materials in the cement are 65-67: 29-31: 4.CN93105528.8 number " multifunctional portland fly-ash cement " contains Portland clinker 48-78%, contains flyash 20-50%, contains gypsum 2-6%.CN96118278.4 number " flyash compound cement " its composition includes flyash 30%～80%, cement 10%～60%, gypsum 5%～50%, lime 3%～10%.Its cement of CN97100220.7 number " unburned flyash silicate cement and preparation method thereof " consist of flyash 40%, grog 55%, gypsum 4.3%, naphthalene water reducer 0.4%, Na2SO40.3%.A kind of " less clinker high early strength flyash cement " disclosed for CN97108370.3 number, its cement be combined as flyash 30-40%, water-granulated slag 30-40%, cement clinker 10-30%.Though it is few chamotte powder coal ash cement, but still to use the cement clinker of 10-30%.Remain a kind of method with manufacture of cement cement.

The patent application that has also discloses some and has not needed to produce with cement clinker the method for cement, as CN94111221.7 number " method for making non-clinker cement by wet-milling flyash and goods thereof " is a kind of cement of low index (275#) that is formed by the wet-discharged coal ash of thermal power plant, lime, gypsum thorough mixing after levigate respectively, it need not use cement clinker, but the wet-discharged coal ash of its thermal power plant needs can be by 4900 holes/CM ↑ sieve and make its moisture≤70% through grinding, the consumption of its fine-ground fly-ash (water content≤70%) can reach 55-75%, but the consumption of levigate plaster stone has only 4-5%.The CN94116979.0 of University of Science ﹠ Technology, Beijing number " wet process for producing flyash cement " patent, the moisture absorption and the pyrogenic effect of unslaked lime have been utilized, make the moisture content mummification in pre-homogenization process in the wet fly-ash, semi-hydrated gypsum is 1～5% in its proportioning raw materials, unslaked lime 20～50%, flyash 50～80%.The consumption of gypsum is 1～5%, still seldom.The prescription and the technology of this method and the described method of CN94111221.7 patent application are all fairly simple, but the cement intensity that these two kinds of methods are produced does not also reach the requirement of market to strength of cement.In general engineering project, if use this cement, the amount increasing that will make transportation and store, construction cost raising; Thereby their range of application is restricted, is unfavorable for applying.In fact, on market, be difficult to find this low-grade cement,, sell the commercial city and be reluctant to sell this cement owing to find no market.

CN96118276.8 number " non-chamotte burning-free flyash cement " contains flyash, slag, lime, gypsum, also contain slag, admixture auxiliary agent, composite curing agent, the content of each component thing in cement is respectively (weight percent): flyash 30-50%, slag 20-36%, slag 14-22%, lime+gypsum 5.2-7.5%, admixture auxiliary agent 1.5-2.5%, composite curing agent 4.5-6%.The consumption that its lime adds gypsum has only 5.2-7.5%.

The cement that this method is produced, though its intensity can reach the requirement of market to strength of cement, it also will use other raw materials such as slag, slag, admixture auxiliary agent and composite curing agent, this will make prescription and complex process, production cost height; And the aging conditions of admixture, auxiliary agent and composite curing agent is as factor how, the psychological impacts that can bring some to determine to the user all, and this also is to utilize one of reason that the cement of admixture, auxiliary agent, solidifying agent production is difficult to apply.Particularly these several disclosed methods of patent application all can't be used the desulfurated plaster of thermal power plant in a large number, can't mass consumption thermal power plant be the secondary product that the desulfurization environmental protection generates.

Summary of the invention

Task of the present invention is the weak point that will overcome aforesaid method, provide a kind of without cement clinker, need not calcine, make full use of desulfurated plaster and flyash, technology is fairly simple, production cost is lower, is fit to the method for production of cement of large-scale industrial production.

Through proving repeatedly and testing, task of the present invention has been finished by following technical scheme finally: proportioning raw materials (% is than meter by weight) is, flyash 35-50, unslaked lime 45-53, desulfurated plaster 5-20 after metering, batching, sends into flyash, unslaked lime and the desulfurated plaster of said ratio the ball mill Shen and wears into 320-500 purpose powder, packed then and deposit 28-45 days, cement.

We know, the main component of flyash is silicon-dioxide, aluminium sesquioxide and ferric oxide, the main component of unslaked lime is a calcium oxide, the main component of desulfurated plaster is the calcium sulfate that has two water moleculess, behind their mix grindings, through interacting, a large amount of tricalcium silicate, Dicalcium Phosphate (Feed Grade), Calucium Silicate powder and materials such as tricalcium aluminate, calcium aluminate will be generated between them.These materials are main components of hardening of cement, do the time spent with water and can generate hydrosilicate and hydrated aluminum hydrochlorate.This is very similar to traditional classical manufacture of cement (with levigate behind Wingdale, gypsum, the clay burning), and its net result is also identical with curing.Different is: method of the present invention has strengthened the consumption of gypsum (desulfurated plaster), uses flyash without clay.Traditional method is made raw material with clay, is in order to obtain materials such as silicon-dioxide, aluminium sesquioxide, and method of the present invention pulverized fuel ash as raw materials also is in order to obtain materials such as silicon-dioxide, aluminium sesquioxide, because of just containing these materials in the flyash just.Traditional method will be calcined, and is in order to make Wingdale become unslaked lime, and method of the present invention is directly made raw material with unslaked lime, just needn't adopt and calcine.Thereby the cement quality of the cement of method production of the present invention and the production of traditional technology prescription is suitable.Method of the present invention only need be controlled the proportioning (being the described proportioning of literal the last period) of desired raw material well, and they are interacted fully in mix grinding, after wearing into the powder of suitable fineness, deposit reasonable time, just can obtain qualified cement products, and production cost is low, equipment and human input is few, market is acceptant.

Because the present invention is without cement clinker, but to make full use of thermal power plant be environmental protection, for eliminating waste one desulfurated plaster and the flyash that the flue dust that discharges in the chimney and sulfurous gas produce, and raw material has only three kind, to need need not calcine through grinding processing, do not need shaft kiln or rotary kiln, thereby technology is fairly simple, production cost is lower, founding the factory, it is fast to go into operation, both be fit to large-scale industrial production, and also be fit to medium-sized and small enterprises production, clothes close national environmental protection, requirements of saving energy.

Embodiment

Enforcement of the present invention is finished in Laibin City, Guangxi hawk Building Materials Factory, implements the environmental protection waste material that used desulfurated plaster and flyash are respectively Guangxi Heshan power plant and guest power plant; Desulfurated plaster is the gypsum that sweetening process generates, and flyash is two, three grades of flyash or lime-ash, and unslaked lime is the product of outsourcing.First example of the invention process is: the flyash that weighing is 350 kilograms, 450 kilograms unslaked lime and 200 kilograms desulfurated plaster, put into ball mill and wear into 320 purpose powders, packed then and deposit 28 days, and after testing, can reach the Portland cement standard of 325 labels.

Second example implementing is: the flyash that weighing is 400 kilograms, 480 kilograms unslaked lime and the desulfurated plaster of 120 kg, and put into ball mill and wear into 320 purpose powders, packed then and deposit 40 days, after testing, can reach the Portland cement standard of 325 labels.

The 3rd example of implementing is: the flyash that weighing is 370 kilograms, 530 kilograms unslaked lime and 100 kilograms desulfurated plaster, and put into ball mill and wear into 500 purpose powders, packed then and deposit 45 days, after testing, promptly get the Portland cement of 425 labels.

Claims

1. method of utilizing desulfurated plaster and flyash to produce cement, it is characterized in that: its proportioning raw materials % ratio is by weight counted: flyash 35-50, unslaked lime 45-53, desulfurated plaster 5-20, with flyash, unslaked lime and the desulfurated plaster of described proportioning after metering, batching, send into and wear into 320-500 purpose powder in the ball mill, packed then and deposit 28-45 days.

2. by the described method of utilizing desulfurated plaster and flyash to produce cement of claim 1, it is characterized in that: its proportioning raw materials % ratio is by weight counted: flyash 35, unslaked lime 45, desulfurated plaster 20, with flyash, unslaked lime and the desulfurated plaster of described proportioning after metering, batching, send into and wear into 320 purpose powders in the ball mill, packed then and deposit 28 days.

3. by the described method of utilizing desulfurated plaster and flyash to produce cement of claim 1, it is characterized in that: its proportioning raw materials % ratio is by weight counted: flyash 40, unslaked lime 48, desulfurated plaster 12, with flyash, unslaked lime and the desulfurated plaster of described proportioning after metering, batching, send into and wear into 320 purpose powders in the ball mill, packed then and deposit 40 days.

4. by the described method of utilizing desulfurated plaster and flyash to produce cement of claim 1, it is characterized in that: its proportioning raw materials % ratio is by weight counted: flyash 37, unslaked lime 53, desulfurated plaster 10, with flyash, unslaked lime and the desulfurated plaster of described proportioning after metering, batching, send into and wear into 500 purpose powders in the ball mill, packed then and deposit 45 days.