CN101817668A - Process for producing autoclaved mud bricks by using paper-making solid wastes - Google Patents

Abstract

The invention discloses a process for producing autoclaved mud bricks by using paper-making solid wastes. The process is characterized by comprising the following steps of: adding alkali recovery white clay into paper-making water treatment sludge to obtain modulated sludge; uniformly mixing the modulated sludge and pulverized fuel ash, crude white clay, sand, slag, lime and desulfurization gypsum in proportion in a mixer; producing unburned bricks by using the mixture with a hydraulic brick making machine; and drying the unburned bricks and sintering the dried unburned bricks at a high temperature to produce the finished products. The autoclaved mud bricks produced by the process have light weight, high strength, sound insulation, high heat preservation and anti-freezing properties and the high performance of neat appearance; and the process has the advantages of good economic, environmental-protection and social effects because the wastes of cogeneration paper-making enterprises are comprehensively treated.

Description

A kind of technology of utilizing the papermaking solid waste to make autoclaved mud bricks

Technical field

The present invention relates to relate to environmental protection, comprehensive utilization of resources and building material field, particularly utilize the papermaking solid waste to make the technology of autoclaved mud bricks.

Background technology

At present, the practical operation situation and the expected value of all papermaking solid waste brickmaking projects greatly differ from each other now, and major cause has as follows: the water-absorbent of 1) papermaking solid waste brick improves and compactness descends, to the resistance to corrosion of environment well below standard square.In the brickmaking, mud has reduced the plasticity of compound sample, has reduced the intergranular adhesive property of compound sample.The water-intake rate of brick is low more, and its weather resistance is with strong more to the resistance to corrosion of environment, thereby the internal structure of brick should be fine and close as far as possible, avoids water to infiltrate.And great number of organic matters in the mud, volatilization must stay hole during sintering, and particle diameter is thicker, and sintered compact compactness is poor.

2) sintering temperature shakiness and percent of firing shrinkage rise, and cause the finished product rate to descend.In the burned brick process, because the large quantity of moisture that exists in mud evaporation, and take away a large amount of heat energy, cause the performance of percent of firing shrinkage rising, energy consumption height, brick to reduce.Percent of firing shrinkage is corresponding increase with the increase of sludge content, becomes approximate line style relation.

3) pollution from exhaust emission of sintering procedure: for fear of the brick cracking, need brickmaking slow heating, sintering and a process of cooling, under the degree scope, created the high chloride envrionment conditions in the mud, increased the seriously polluted property of discharging waste gas.

4) to change Strategic Policy inconsistent with wall: existing making brick from sludge process sludge adds as batching, with the ratio of clay (or shale) be about 1:10, if the mud proportioning is excessive, when sintering, may cause the fragment of brick cracking.Therefore, make sludge brick and also need 90% clay (or shale), unit fragment of brick raw sludge consumption is on the low side, wishes logical inner feelings against relevant department, and to change Strategic Policy inconsistent with wall.Yield rate owing to brickmaking is low simultaneously, unstable product quality, and the energy consumption height, the production cost multiplication causes product seriously unsalable.

All there is a lot of defectives in existing papermaking solid waste brickmaking technology from Technological Economy, environment protection and social influence at present, and added value of product is low, and the application market prospect is poor, belongs to immature technology, is badly in need of optimizing and improving.

Summary of the invention

The objective of the invention is, unstable product quality low, energy consumption height, too high, the serious unsalable difficult problem of product of production cost for the yield rate that solves the brickmaking of present papermaking solid waste brickmaking project, provide a kind of can be made in light weight, intensity is high, the technology of the autoclaved mud bricks of sound insulation, insulation and good frost resistance, flat appearance.

The objective of the invention is to be achieved through the following technical solutions: a kind of technology of utilizing the papermaking solid waste to make autoclaved mud bricks, it is characterized in that comprising the steps: 1. alkali recovery white slime to be carried out closely knit modulation by the amount adding paper-making water treatment sludge of (12～18) % of paper-making water treatment sludge oven-dry weight (weight), obtain modulated sludge;

2. modulated sludge and flyash, thick white clay, sand, slag, lime, desulfurated plaster are stirred in whipping device in proportion, described each weight percentages of components is a modulated sludge: flyash: thick white clay: sand: slag: lime: desulfurated plaster is (10～16): (40～52): (8～12): (8～12): (10～15): (5～7): (1～5);

3. with the fluid pressure type brick press said mixture is made adobe;

4. drying is carried out in adobe, adobe moisture content is controlled at below 16%, more dried adobe is utilized 850 ℃～1200 ℃ high temperature sinterings to become finished product in 3～4 hours.

Step drying 4. is seasoning, with alkali recovery roasting kiln and thermoelectric power station roasting kiln waste heat drying is carried out in adobe.

The present invention joins paper-making water treatment sludge with the papermaking alkali recovery white slime and carries out closely knit modulation, thereby makes the CaCO in the white clay ₃Grafting on the mud middle short fiber, filling make staple fibre become strongthener.Again with the mud after the closely knit modulation and lime, thick white clay, sand, thermoelectric desulfurized gesso of flue gas, flyash, be mixed in proportion and carry out the modulation of base brick performance, through mechanical-moulded and steam press maintenance, the steaming of making presses sludge brick lighter by 25% than common brick, have in light weight, intensity is high, the high-performance of sound insulation, insulation and good frost resistance, flat appearance, has good social benefit and economic benefit; And the yield rate that has solved the brickmaking of present papermaking solid waste brickmaking project is low, unstable product quality, energy consumption height, production cost are too high, the serious unsalable difficult problem of product, comprehensive treating process cogeneration papermaking enterprise waste, have good economy, environmental protection, social benefit.

Embodiment

Further illustrate content of the present invention below in conjunction with specific examples, but these embodiment do not limit protection scope of the present invention.

Embodiment 1:

Earlier alkali recovery white slime is carried out closely knit modulation by 12% amount adding paper-making water treatment sludge of paper-making water treatment sludge oven-dry weight (weight), obtain modulated sludge; Taking by weighing modulated sludge 1300g, flyash 4850g, thick white clay 1000g, sand 1000g, slag 1200g, lime 500g and desulfurated plaster 150g more respectively allocates in the laggard whipping device and stirs; With the fluid pressure type brick press said mixture is made the adobe of 240 * 115 * 53 shape and size again; Utilize thermoelectric power station roasting kiln waste heat that drying is carried out in adobe, adobe moisture content is controlled at below 16%, more dried adobe is utilized 850 ℃～1200 ℃ high temperature sinterings to become finished product in 3.5 hours.The gained finished product reaches JC239-2001 " flyash brick " standard.

Embodiment 2:

Earlier alkali recovery white slime is carried out closely knit modulation by 18% amount adding paper-making water treatment sludge of paper-making water treatment sludge oven-dry weight (weight), obtain modulated sludge; Again modulated sludge 1000g, flyash 5200g, thick white clay 1200g, sand 800g, slag 1000g, lime 700g and desulfurated plaster 250g are allocated in the laggard whipping device and stir; With the fluid pressure type brick press said mixture is made the adobe of 240 * 115 * 53 shape and size again; Utilize thermoelectric power station roasting kiln waste heat that drying is carried out in adobe, adobe moisture content is controlled at below 16%, more dried adobe is utilized 850 ℃～1200 ℃ high temperature sinterings to become finished product in 3.5 hours.The gained finished product reaches JC239-2001 " flyash brick " standard.

Embodiment 3:

Earlier alkali recovery white slime is carried out closely knit modulation by 15% amount adding paper-making water treatment sludge of paper-making water treatment sludge oven-dry weight (weight), obtain modulated sludge; Modulated sludge 1600g, flyash 4000g, thick white clay 800g, sand 1200g, slag 1500g, lime 600g and desulfurated plaster 700g allocated in the laggard whipping device stir; With the fluid pressure type brick press said mixture is made the adobe of 240 * 115 * 53 shape and size again; Utilize thermoelectric power station roasting kiln waste heat that drying is carried out in adobe, adobe moisture content is controlled at below 16%, more dried adobe is utilized 850 ℃～1200 ℃ high temperature sinterings to become finished product in 3.5 hours.The gained finished product reaches JC239-2001 " flyash brick " standard.

Claims (2)

1. technology of utilizing the papermaking solid waste to make autoclaved mud bricks, it is characterized in that comprising the steps: 1. alkali recovery white slime to be carried out closely knit modulation by the amount adding paper-making water treatment sludge of (12～18) % of paper-making water treatment sludge oven-dry weight (weight), obtain modulated sludge;

2. modulated sludge and flyash, thick white clay, sand, slag, lime, desulfurated plaster are stirred in whipping device in proportion, described each weight percentages of components is a modulated sludge: flyash: thick white clay: sand: slag: lime: desulfurated plaster is (10～16): (40～52): (8～12): (8～12): (10～15): (5～7): (1～5);

3. with the fluid pressure type brick press said mixture is made adobe;

4. drying is carried out in adobe, adobe moisture content is controlled at below 16%, more dried adobe is utilized 850 ℃～1200 ℃ high temperature sinterings to become finished product in 3～4 hours.

2. technology according to claim 1 is characterized in that: step drying 4. is seasoning, with alkali recovery roasting kiln and thermoelectric power station roasting kiln waste heat drying is carried out in adobe.