CN1046458C - Process for producing high blending weight flyash clay sintered brick - Google Patents

Abstract

The present invention relates to a production technique of a sintered brick, in which pulverized coal ash is taken as main material, and a small amount of clay soil is added. The production technique comprises raw material preparation, mixing and stirring materials, pulverization, moulding, drying and calcination. The technique has the requirements that the natural dewatering amount of the pulverized coal ash is below 26%, the clay soil has aged for three months, pulverized granules are smaller than 1mm, the brick is moulded by vacuum extrusion, drying temperature is from 100 to 180 DEG C, and calcination temperature is from 900 to 1000 DEG C. The present invention enhances the proportioning of pulverized coal ash, has advanced and reliable techniques, does not need any adhesive agents, and has the advantages of low cost, high strength, good product quality, saving of energy and environment pollution reduction.

Description

The production technology of high blending weight flyash clay sintered brick

The present invention relates to a kind of with flyash as material of main part, other adds the production technology of the building clinker that a little clay forms.

The kind of the flyash brick of building trade is a lot of at present, as the aerating flyash brick, and steam-cured fly ash brick, fired fly ash brick and sintering-free flyash brick etc., its constriction coefficient is big, and weathering easily is difficult to satisfy the requirement of skyscraper.Some high fly ash brick, promptly flyash content reaches 70～90%, but all will add inorganic or organic binder bond could be made building brick, and its intensity is not high, and range of application is wideless.For producing weight flyash clay sintered common brick, generally all be that flyash mixed Comparative Examples does not increase, its subject matter is: (1) traditional handicraft is for the wet ash discharge of power plant, and dehydration is difficult, as uses vacuum dehydration, the cost height, the oven dry energy consumption is big; On handling, raw material is difficult to guarantee that brickmaking particle 80% is below the 2mm, so do not bring into play the caking property of clay; (2) feedstock production does not reach requirement, flyash mixedly will extrude not moulding to measuring height, and semi-finished product are loosely organized; (3) can only utilize the flyash of golf calorific value, and for the flyash of lower calorific value, mix and do not reach the internal combustion requirement less measuring; (4) plasticity to clay requires height, and the clay of medium plasticity (as mountain soil) is flyash mixed to amount just still less.State's invention patent disclosure specification CN1087331A (application number 92113185.2) has put down in writing hypertonic powdered coal ash sintered products and production technology thereof in 1 day June in 1994, and its flyash content is up to 92%, and clay content only reaches 8%, but need add combustible.In fact can not apply in producing, its reason is as follows: 1, require " flyash is that ash discharge is done by power plant, and wet ash discharge will be dried; more than the requirement of clay plasticity is medium " in the specification, and in fact power plant generally all is wet ash discharge, needs a large amount of energy, cost height like this as drying; 2, production technology is " extrusion molding; compound moisture content is controlled at 23～33% and is advisable " and actual deviating from, because moisture content height, will be above the critical moisture content of extruding, extruded velocity will reduce to zero, and at this moment raw material and spiral leaf skid, even 23% moisture content extrusion molding, because of containing rate height forever, the distortion of mud bar can not be ensured the quality of products.3, moisture content requires to extrude moisture content and is advisable to be lower than 21%, so expressing technique is unreal in 23～33% gear shaper without theoretical foundations in " sintered brick and tile enterprise-quality rule of management ".4, compression moulding among the embodiment, technology own is immature, because " half-dried molded technology is to the ingredient requirement height; often require the dry process raw material; so complicated process of preparation, require the briquetting pressure height, so the press heaviness is huge; whole technology is responsive to the raw material fluctuation, requires control and monitoring technology complexity.Must adopt cautiously based on above-mentioned a series of reasons.Must use enough big pressure for the structure that obtains high intensity and uniformity, excessive pressure causes the goods layering " (selecting from " sintering brick and tile craft " book that Yin Nianzu etc. writes).This shows that 92113185.2 patent applications are a kind of jejune technology, are not easy to apply.

The objective of the invention is to overcome above-mentioned defective, a kind of production technology of high blending weight flyash clay sintered brick is provided.

Technical scheme of the present invention: the high-content fly ash brick be with flyash as material of main part, other adds the building clinker that a little clay is formed, its component weight proportion is: general flyash 60～85%, clay 15～40% is advisable.The present invention does not all have specific (special) requirements to flyash and clay, does not need to add inorganic or organic binder bond yet; Can produce the hollow brick of common brick and all size.Production technology of the present invention, it comprise feedstock production → batch mixing stirring → pulverizing → moulding → thousand dry → roasting, its technical characterictic is:

1, feedstock production: be the flyash example to be gone into the stockyard dewater standby naturally at warehouse-in below 26%; Clay is poured stockyard nature battle arrayization into and is put in storage standby more than three months.

2, batch mixing stirs: adopt biaxial rneader to carry out batch mixing and stir, promptly according to the weight proportion of above-mentioned component, place box batcher to send into mixer through conveyer belt flyash and clay and carry out batch mixing and stir, the moisture content after it stirs is 20～21%.

3, pulverize: adopt the two-wheel pulverizer that compound is pulverized, promptly compound is sent in the two-wheel pulverizer through conveyer belt and is pulverized, and the compound after it is pulverized is formed greater than the coarse granule of 0.9mm less than the fine grained and 5～10% of 0.9mm by 90～95%.Because particle is little, gives full play to the caking property of clay, thereby makes compound have good processability;

4, moulding: adopt vacuum extruding form, its extrusion pressure is 1～1.5MPa, and moisture content is below 21%;

5, drying: drying is carried out in adobe in dry kiln, because flyash mixed to measuring height, drying sensitivity reduces, so realize artificial drying in 100～180 ℃ hot blast medium, 15～18 hours arid cycles.

6, roasting: the adobe roasting is first preheating 7～8 hours, roasting 4～6 hours, insulation cooling 7～8 hours, the roasting maximum temperature is 900～1000 ℃, be that whole roasting process is to be heated to 200 ℃ earlier, evenly rose to 750 ℃, evenly rise to 900～1000 ℃ from 750 ℃ through 2～3 hours again through 5～6 hours, and at 900～1000 ℃ of sintering after 4～6 hours, mix through 7～8 hours chambers of slowly cooling to.Because high-content fly ash, base substrate has higher caloric value, and therefore fuel savings significantly reduces coal consumption.

On manufacture craft, after the two-wheel pulverizer is pulverized, mixture particle is below 1mm, and it is tightr to adopt the high vacuum extrusion molding to make between particle, after the drying, roasting in 900～1000 ℃, complicated physics-chemical reaction at high temperature takes place in the mineral matter in flyash and the clay, generates the more stable material of character on the one hand, and the fusion of particle and the generation of new crystalline phase take place on the other hand, the fusion of particle forms liquid phase, and the increase of amount of liquid phase makes the appearance of solid particle wrap one deck liquid.Since by pulverize and vacuum forming after particle little and dense, these high-temperature fusants cooling back formation glass, the solid particle of crystallization is bonded together securely by glassy phase, unusual close and firm, thus obtain high-intensity goods.

The present invention presses component proportioning flyash: the brick of clay=production in 80: 20, and show through authoritative department-product quality supervision and inspection station, Hunan Province assay: its product main performance is as follows:

Compression strength mean value is MU20.4MPa;

Boiling in 5 hours, to boil water absorption rate mean value be 21.7%;

Saturation coefficient mean value is 0.71.

In sum, the production technology of high-content fly ash clay brick of the present invention compared with the prior art, utilized flyash fully, reduced the cost of raw material greatly, production technology is advanced reliable, the established technology process makes brick body internal structure even, the density height has further increased the intensity of brick, good product quality, strength grade improves greatly, and energy savings has reduced environmental pollution again.

Claims (1)

1, a kind of is material of main part with flyash, adds the production technology of the fired brick of a little clay composition, and it comprises feedstock production → batch mixing stirring → pulverizing → moulding → drying → roasting, it is characterized in that:

A, feedstock production are to pour flyash into stockyard to dewater standbyly at warehouse-in below 26% naturally, and clay is poured stockyard nature battle arrayization into and put in storage standby more than three months again;

B, batch mixing stir and adopt biaxial rneader to carry out the batch mixing stirring, promptly according to high-content fly ash, the weight proportion that adds a little clay places box batcher to stir in conveyer belt is sent into mixer in flyash and clay, and the moisture content after its compound stirs is 20～21%;

C, pulverizing are to adopt the two-wheel pulverizer that compound is pulverized, and promptly compound is sent in the two-wheel pulverizer through conveyer belt and pulverized, and the compound after it is pulverized is formed greater than the coarse granule of 0.9mm less than the fine grained and 5～10% of 0.9mm by 90～95%;

D, employing vacuum extruding form, its extrusion pressure is 1～1.5MPa, moisture content is below 21%;

Drying is carried out in c, adobe in dry kiln, its drying medium temperature is 100～180 ℃, and be 15～18 hours arid cycle;

F, adobe roasting are first preheating 7～8 hours, roasting 4～6 hours, insulation cooling 7～8 hours, the roasting maximum temperature is 900～1000 ℃, promptly be heated to 200 ℃ earlier, evenly rose to 750 ℃, evenly rose to 900～1000 ℃ of sintering that heat up through 2-3 hour from 750 ℃ again through 5～6 hours, and 900～1000 ℃ behind 4～6 hours sintering, slowly cooled to room temperature through 7～8 hours.