CN102173749A

CN102173749A - Technology for preparing ceramic tile from high-volume municipal water supply plant sludge

Info

Publication number: CN102173749A
Application number: CN2011100014091A
Authority: CN
Inventors: 谢敏; 沈倩雯; 刘小波; 高丹; 李芳�; 邓玉梅
Original assignee: Changsha University of Science and Technology
Current assignee: Changsha University of Science and Technology
Priority date: 2011-01-06
Filing date: 2011-01-06
Publication date: 2011-09-07
Anticipated expiration: 2031-01-06
Also published as: CN102173749B

Abstract

The invention discloses a technology for preparing a ceramic tile from high-volume municipal water supply plant sludge, and belongs to the field of solid waste recycling and building material production in environmental engineering. The technology comprises the following steps of: uniformly mixing 38 to 42 mass percent of municipal water supply plant dewatering sludge powder (dry weight) with a certain grain size, 38 to 42 mass percent of kaolin and 16 to 24 mass percent of potassium feldspar powder, adding water which is about 20 percent based on the dry weight of the total material, uniformly mixing, and storing for certain time in a constant-temperature environment; and performing compression molding under certain pressure, raising the temperature from room temperature to 1,200 DEG C by a certain method and keeping temperature for one hour, and naturally cooling to the room temperature to obtain the finished product. Through detection, the main technical indexes meet the related national standard. By the technology, the water supply plant sludge is effectively utilized, and other brick production raw materials are substituted; and the technology has good environmental benefit and certain economic benefit.

Description

High volume city water factory mud prepares the technology of ceramic tile

Technical field

The present invention relates to a kind of solid waste recovery and utilization technology and material of construction production, particularly a kind of high volume city water factory mud prepares the technology of ceramic tile.

Background technology

Along with the continuous expansion of city size, the spoil disposal problem of city water factory manifests gradually.Dewatered sludge after treatment adopts the ground landfill to dispose or burning disposal basically.The technology and equipment complexity of burning, energy consumption is big, and expense is higher, and has the problem of topsoil; Landfill not only takies a large amount of fields, and polluted underground water and rivers water resources.And abroad some researchers have carried out correlative study to the toxicity of water supply plant dewatered sludge, studies show that aluminium matter throw out can cause secondary pollution to environment, and especially the aqueous solution that goes out of aluminium salt mud drop can influence the growth of marine alga.In sum, we effectively dispose waterworks sludge will have positive meaning to water environment.

Utilize angle from protection environment and water resources persistence, it is final developing direction that the water supply plant spoil disposal is fully utilized.This is stable and ensure to water factory's safe operation and be absolutely necessary to the running balance of keeping ecotope.Scholar S.N.Monteiro etc. are with the red pottery of waterworks sludge and clay preparation, give the highest of sewage sludge add-on to 10%, and the modulus of rupture are no more than 24Mpa.People such as G.R.Xu utilize waterworks sludge and sewage plant sludge baking ceramsite, and giving sewage sludge and sewage sludge proportioning is 45/55, add other batching back brick intentions less than 16Mpa.Appoint people such as uncle's flag in flyash-clay brick production, to mix the sewage sludge of giving of 30%～45% (volume ratio) water ratio 60%～80%.People such as Ba Ruhu adopt water factory's weathering dewatered sludge, are equipped with aggregate and tackiness agent (three's mass ratio is 1: 3: 6) and make non-burning brick.In above-mentioned research, utilize waterworks sludge to prepare in the processes such as brick, aggregate for building, abrasive, ceramic industry raw material, consumption is generally lower, and product intensity is not high, and does not domesticly have a waterworks sludge potting ceramic tile patent of being correlated with.

Summary of the invention

The technical problem to be solved in the present invention is the deficiency at prior art research, a kind of technology of city water factory dewatered sludge firing ceramics brick of high volume is proposed, dewatered sludge directly adds in the batching after drying, by compression moulding, cryodrying, high-temperature firing, form harder ceramic tile finished product.

The technical matters of described high volume city water factory dewatered sludge firing ceramics brick comprises:

1. starting material:

Mud powder: adopt city water factory dewatered sludge, make the mud powder after oven dry is pulverized, and particle diameter is less than 0.15mm;

Kaolin: chemical pure;

Feldspar in powder: particle diameter 0.15mm;

2. processing step:

1) batching (mass percent): mud powder 20%-60%; Kaolin 30%-80%; Feldspar in powder 10%-30% mixes;

2) add water: in the said mixture material, add the water of total material dry weight about 20%, stir;

3) store: in 18 ℃ of-22 ℃ of isoperibols, stored 20-24 hour;

4) compression moulding: described material is put into mould, with the compression moulding of 25Mpa-30Mpa pressure;

5) drying: green compact are put into thermostatic drying chamber, at 100-105 ℃ of dry 2h;

6) fire: room temperature heats up and is heated to 1200 ℃, and is incubated 1 hour;

7) cooling: naturally cool to room temperature, promptly get finished product.

The present invention is directed to the main raw material of city water factory dewatered sludge as brickmaking, through fully research and a large amount of, repetition test, the kaolin, feldspar in powder of preferably having determined certain proportioning are as batching, and make specific production technique and step, make finished product and detect by ceramic tile GB/T4100-2006 examination criteria.

The technical feature of described finished product has:

1) through the check of the visual appearance of finished product, deviation＜2.0% of length and width mean sizes, and fragment of brick surpasses 95% regional no significant defect, and the visual appearance of finished product meets national ceramic tile standard-required;

2) finished product (mud potting ceramic tile) water-intake rate＜3% reaches Shi ceramic tile standard-required (classification of dry-pressing ceramic tile sees Table 1);

(dry-pressing ceramic tile: the powder that mixes is placed mould compression moulding under certain pressure)

3) modulus of rupture of finished product satisfies the requirement of fine stoneware tile all greater than 25.0MPa;

4) finished product is carried out chemical resistance and detect, the cutting edge of fragment of brick does not all have visible change, is UA level, UHA level and UHB level, illustrates that the chemical resistance of this mud ceramic tile is stronger;

5) by firing, the metal ions such as Al in the goods batching can form eutectic with other material, are obviously solidified, and are difficult for leaching.

The classification of table 1 dry-pressing ceramic tile

In sum, the present invention is a kind of with the technology of city water factory mud as main raw material firing ceramics brick.Directly to add in the batching after the dewatered sludge drying,, form harder fragment of brick by compression moulding, cryodrying, high-temperature firing.This technology makes dewatered sludge obtain effective utilization, has substituted the part brick-making raw material, and a kind of material of novel environment friendly cheaply not only is provided, and the processing costs of having saved mud.In addition,, help improving roasting effect, save baking expense owing to contain combustiblecomponents in the dewatered sludge.And dewatered sludge has coking property preferably, and mixes use with kaolin, helps improving the physicals of adobe.In addition, also can in batching, add other chemical ingredientss, help further improving the various performances of fragment of brick.

Embodiment

1. starting material:

The mud powder: pulverize after taking from the oven dry of Changsha water supply plant dewatered sludge, cross 28 orders and sieve into the mud powder with 100 mesh sieve, mud powder footpath is less than 0.15mm;

Kaolin: chemical pure

Feldspar in powder: about particle diameter 0.15mm

Table 2 mud main component (w%)

2. processing step:

1) batching: adopt the mud powder: kaolin: Feldspar Powder=5: 5: 2 mass ratio batchings mixes;

2) add water: in batching, add the water of total batching dry weight 20%, mix;

3) store: stored 24 hours at Constant Temp. Oven (202-2AB type) (20 ℃), make moisture uniform distribution in batching;

4) compression moulding: batching is put into mould, utilize the compression moulding of pressure testing machine (SYA-200B) 25Mpa pressure;

5) sintering: begin heat-up rate from room temperature, be heated to 300 ℃ gradually, as drying stage with 16 ℃/minute; Be warming up to 600 ℃ with 10 ℃ of/minute speed subsequently; Then be warming up to 800 ℃ with 6 ℃ of/minute speed; Be warmed up to 1200 ℃ with 4 ℃/minute again; At last with 1200 ℃ of insulations 1 hour;

6) cooling: naturally cool to room temperature, promptly get finished product.

3. test-results:

No microgroove crack, gained fragment of brick surface, and smooth smooth.The fragment of brick water-intake rate is about 2.8%.The modulus of rupture reaches 27.67MPa.According to ceramic tile test method GB/T3810.13-2006, fragment of brick is carried out chemical resistance detect.The result shows that the cutting edge of fragment of brick does not have considerable change, and the chemical resistance of fragment of brick is preferable.

Claims

1. one kind high volume city water factory mud prepares the technology of ceramic tile.Its preparation method is characterised in that with waterworks sludge and kaolin be main raw material, adds the small amount of potassium Feldspar Powder, various raw materials is added water mix, and makes half-finished adobe, with brick blank drying, roasting, makes finished product.

2. high volume waterworks sludge brick according to claim 1 is characterized in that the batching scope of raw material is: mud powder 38%-42%; Kaolin 38%-42%; Feldspar in powder 16%-24%.

3. high volume waterworks sludge brick according to claim 2 pulverizes after it is characterized in that adopting city water factory dewatered sludge to dry, and makes the mud powder, and its mud powder footpath is less than 0.15mm; Kaolin and feldspar in powder particle diameter are about 0.15mm.

4. the preparation method of high volume waterworks sludge brick according to claim 2, its feature:

1) adds water: add the water of total material dry mass about 20% in the mixture according to claim 2, stir;

2) store: in 18 ℃ of-22 ℃ of isoperibols, stored 20-24 hour;

3) compression moulding: described material is put into mould, with the compression moulding of 25Mpa-30Mpa pressure;

4) drying: green compact are put into thermostatic drying chamber, at 100 ℃ of-105 ℃ of dry 2h;

5) fire:, be warmed up to 1200 ℃ and be incubated 1 hour gradually by certain method from room temperature;

6) cooling: naturally cool to room temperature, promptly get finished product.