CN101565295A - Method using mud and sludge for sintering brick - Google Patents

Abstract

The invention provides a method for sintering brick with mud and sludge, which includes: step 10, anhydrating mud and sludge respectively, and controlling moisture at 5%-10%, and then pulverizing, sieving and selecting thin powder with particle diameter under 5mm respectively; Step 20, weighing and mixing mud and sludge thin powder according to mass ratio, adding a certain amount of auxiliary raw material and water for mixing and stirring; Step 30, extruding and forming mixed raw material after being stirred for producing green brick; Step 40, drying green brick and maintaining moisture percentage at 1-2%, and then calcining at 900-1000 DEG C for 30-38 hours and obtaining sintered brick product. The method provided by the invention for sintering brick using mud and sludge realizes resource utilization of mud and sludge, thereby changing waste into treasure and protecting environment.

Description

The method of using sludge sludge to sinter bricks

【Technical field】

The invention relates to a method for manufacturing building materials, in particular to a method for sintering bricks using sludge and sludge.

【Background technique】

In the process of treating domestic and industrial wastewater, urban sewage treatment plants will produce a large amount of sludge, which has the following characteristics: (1) The water content is as high as 70% to 80%. This part of water is difficult to incinerate, and the transportation cost is high. The land area is large, and the direct landfill will make the landfill scrapped in advance. (2) The content of microorganisms and pathogens is high. If it is directly applied or discarded without treatment, it may cause pollution to the food chain. (3) stench pollutes the environment, and also emits greenhouse gases to the atmosphere during stacking. (4) Contain complex heavy metals, salts and other ingredients. The current sludge disposal methods include: landfill, dry incineration, agricultural use and production of building materials. In addition, the current accumulation of a large amount of silt in the river not only occupies land, but also causes environmental pollution. How to properly dispose of such a large amount of silt, turn harm into benefit, turn waste into treasure, protect the environment, and realize resource utilization of silt is an urgent need for us to solve The problem.

【Content of invention】

The technical problem to be solved by the present invention is to provide a method for sintering bricks by using sludge and silt to realize resource utilization of sludge and silt, turn waste into treasure and protect the environment.

The present invention is achieved in that a method for utilizing sludge silt to sinter bricks is characterized in that it comprises the following steps:

Step 10, drying the sludge and silt separately, and controlling the water content at 5% to 10%, after crushing, sieving and selecting fine powders with a particle size below 5mm;

Step 20, mixing the sludge and the fine powder of the sludge according to the mass ratio, and then adding a certain amount of auxiliary raw materials and water to mix and stir;

Step 30, extruding the stirred mixed raw materials to obtain bricks;

Step 40, drying the adobe until the moisture content is maintained at 1%-2%, and then roasting, the roasting temperature is controlled at 900°C-1000°C, and the roasting time is 30h-38h to obtain a sintered brick product.

Wherein, the drying of the sludge and sludge in the step 10 is a twin-shaft propeller drying. The auxiliary raw materials in the step 20 are fly ash and sulfuric acid slag; the mass ratio of each raw material is: sludge 30%-40%, sludge 40%-60%, fly ash 5%-10%, sulfuric acid slag 5% % to 10%, wherein water is 15% to 25% of the total amount of the first four raw materials. The extrusion pressure of the extrusion molding in the step 30 is 3 MPa.

The invention has the following advantages: the sludge and silt are used to sinter bricks, realizing resource utilization of sludge and silt, turning waste into treasure and protecting the environment; the bricks obtained by firing have high strength (up to 15MPa), good appearance, and no Indentation and black center, and the sintering temperature is between 900°C and 1000°C, which is easy to achieve.

【Detailed ways】

Example one,

Step 11. The sludge and the sludge are dried separately by twin-shaft propellers, and the water content is controlled between 5% and 10%, and then crushed, and then sieved to select fine powders with a particle size below 5mm.

Step 12, the sludge and the fine powder of the sludge are weighed according to the mass ratio and mixed, then a certain amount of fly ash and sulfuric acid slag are added as auxiliary raw materials, and water is added for mixing and stirring for 10 minutes. Among them, 30% of sludge, 60% of sludge, 5% of fly ash, 5% of sulfuric acid slag, and then add 15% of the water of the total amount of the first four raw materials.

Step 13: Extrude the mixed raw materials after stirring to obtain brick adobe, and the extrusion pressure is 3 MPa.

Step 14. Dry the adobe until the moisture content is maintained at 1% to 2% before entering the kiln. The calcination temperature is controlled at 950° C. and the calcination time is 35 hours to obtain a sintered brick product.

The obtained sintered brick product has a strength of 15.6 MPa, and has no cracks, corners and indentations in appearance.

Example two,

Step 21. The sludge and the sludge are dried by twin-shaft propellers, and the water content is controlled between 5% and 10%, and then crushed, and then sieved to select fine powders with a particle size of 5 mm or less.

Step 22. Weigh the sludge and the fine powder of the sludge according to the mass ratio and mix them, then add a certain amount of fly ash and sulfuric acid slag as auxiliary raw materials, and add water to mix and stir for 10 minutes. Among them, 35% of sludge, 50% of sludge, 10% of fly ash, 5% of sulfuric acid slag, and then add 20% of the total amount of water from the first four raw materials.

Step 23: Extrude the mixed raw materials after stirring to make adobe, and the extrusion pressure is 3 MPa.

Step 24. Dry the adobe until the moisture content is maintained at 1% to 2% before entering the kiln. The calcination temperature is controlled at 900° C. and the calcination time is 38 hours to obtain a sintered brick product.

The strength of the obtained sintered brick product is 16.5MPa, and the appearance has no cracks, no corners, and no indentation

Example three,

Step 31. The sludge and the sludge are dried separately by twin-shaft propellers, and the water content is controlled between 5% and 10%, and then crushed, and then sieved to select fine powders with a particle size below 5mm.

Step 32. Weigh the sludge and the fine powder of the sludge according to the mass ratio and mix them, then add a certain amount of fly ash and sulfuric acid slag as auxiliary raw materials, and add water to mix and stir for 10 minutes. Among them, 40% of sludge, 50% of sludge, 5% of fly ash, 5% of sulfuric acid slag, and then add 15% of the water of the total amount of the first four raw materials.

Step 33: Extrude the mixed raw materials after stirring to make adobe, and the extrusion pressure is 3 MPa.

Step 34. Dry the adobe until the moisture content is maintained at 1% to 2% before entering the kiln. The firing temperature is controlled at 1000° C. and the firing time is 30 hours to obtain a fired brick product.

The obtained sintered brick product has a strength of 15.6 MPa, and has no cracks, corners and indentations in appearance.

Example four,

Step 41. The sludge and the sludge are dried separately by twin-shaft propellers, and the water content is controlled between 5% and 10%, and then crushed, and then sieved to select fine powders with a particle size below 5mm.

Step 42: Weigh the sludge and the fine powder of the sludge according to the mass ratio and mix them, then add a certain amount of fly ash and sulfuric acid slag as auxiliary raw materials, and add water to mix and stir for 10 minutes. Among them, 40% of sludge, 40% of sludge, 10% of fly ash, 10% of sulfuric acid slag, and then add 25% of the water of the total amount of the first four raw materials.

Step 43: Extrude the mixed raw materials after stirring to obtain adobe, and the extrusion pressure is 3 MPa.

Step 44. Dry the adobe until the moisture content is maintained at 1% to 2% before entering the kiln. The calcination temperature is controlled at 980° C. and the calcination time is 33 hours to obtain a sintered brick product.

The obtained sintered brick product has a strength of 17MPa, and has no cracks, corners and indentations in appearance.

Claims (5)

1, a kind of method utilizing sludge silt sintered brick, it is characterized in that comprising the following steps: Step 10, drying the sludge and silt separately, and controlling the water content at 5% to 10%, after crushing, sieving and selecting fine powders with a particle size below 5mm; Step 20, mixing the sludge and the fine powder of the sludge according to the mass ratio, and then adding a certain amount of auxiliary raw materials and water to mix and stir; Step 30, extruding the stirred mixed raw materials to obtain bricks; Step 40, drying the adobe until the moisture content is maintained at 1%-2%, and then roasting, the roasting temperature is controlled at 900°C-1000°C, and the roasting time is 30h-38h to obtain a sintered brick product. 2. The method for sintering bricks using sludge and sludge according to claim 1, characterized in that: the auxiliary raw materials in the step 20 are fly ash and sulfuric acid slag. 3. The method for sintering bricks using sludge and sludge according to claim 2, characterized in that: the mass proportion of each raw material in the step 20 is: 30%-40% of sludge, 40%-60% of sludge, powder 5% to 10% of coal ash, 5% to 10% of sulfuric acid slag, of which water is 15% to 25% of the total amount of the first four raw materials. 4. The method for sintering bricks using sludge and sludge according to claim 3, characterized in that: the extrusion pressure of the extrusion molding in the step 30 is 3 MPa. 5. The method for sintering bricks using sludge and sludge according to claim 4, characterized in that the sludge and the drying of the sludge in the step 10 are double-shaft propeller drying.