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Technology for manufacturing light porous ceramisite from sludge

A technology of porous ceramics and sludge, which is applied in the field of sludge building materials, can solve the problems that the potential value of sludge cannot be fully explored, heavy metals in sludge are difficult to fix, and sludge ceramsite has less pore structure, so as to achieve enhanced heat preservation, The effect of reducing heat transfer and strengthening force

Inactive Publication Date: 2018-05-08
安徽摩诃环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] At present, composting technology, aerobic fermentation technology and anaerobic digestion technology are the main ways to treat sludge, but the effective utilization rate of sludge is low, and the potential value of sludge cannot be fully explored, resulting in waste of resources and pollution. Heavy metals in mud are difficult to fix, causing secondary pollution
Sludge building materials technology utilizes sludge sintering to make building materials such as bricks, cement and ceramsite, but sludge ceramsite has less micropores, lower strength and relatively higher density, so its stability and thermal insulation are poor
The patent application number is CN201710055896.7. Mix 30-70% sludge, 20-60% clay and 10-15% bauxite evenly, then age, dry, granulate and calcinate to make sludge pottery The patent simplifies the production process and improves the sludge treatment efficiency, but the produced sludge ceramsite has less pore structure and poor thermal insulation effect

Method used

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  • Technology for manufacturing light porous ceramisite from sludge
  • Technology for manufacturing light porous ceramisite from sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1: Dry the sludge at 100°C to reduce the water content to 30%;

[0021] Step 2: Mix the sludge and kaolin in step 1 evenly according to the weight ratio of 1:0.4, and then add 15wt% of 20 parts of CaCO 3 , 13 parts of MgCO 3 , 7 Na 2 O and 30 parts Fe 2 o 3 Prepared expansion agent and 2wt% CaF 2 , Grinding into a mixed powder with a particle size of 0.02mm;

[0022] Step 3: Extrude and granulate the mixed powder in step 2 into ceramsite raw meal under 55MPa;

[0023] Step 4: heating at a rate of 5°C / min, preheating at 200°C for 30 minutes, baking at 500°C for 50 minutes, calcining at 1000°C for 50 minutes, and then lowering to room temperature at a rate of 3°C / min to obtain the lightweight porous ceramsite.

Embodiment 2

[0025] Step 1: Dry the sludge at 120°C to reduce the water content to 35%;

[0026] Step 2: Mix the sludge and kaolin in step 1 evenly according to the weight ratio of 1:0.5, and then add 20wt% of 22 parts of CaCO 3 , 15 parts of MgCO 3 , 9 Na 2 O and 32 parts Fe 2 o 3 Prepared expansion agent and 4wt% CaF 2 , Grinding into a mixed powder with a particle size of 0.03mm;

[0027] Step 3: Extrude and granulate the mixed powder in Step 2 under 60MPa to form ceramsite raw meal;

[0028] Step 4: heating at a rate of 7.5°C / min, preheating at 350°C for 35 minutes, baking at 750°C for 60 minutes, calcining at 1150°C for 55 minutes, and then lowering to room temperature at a rate of 5°C / min to obtain the lightweight porous ceramsite.

Embodiment 3

[0030] Step 1: Dry the sludge at 140°C to reduce the water content to 40%;

[0031] Step 2: Mix the sludge and kaolin in step 1 evenly according to the weight ratio of 1:0.6, and then add 25 wt% of 24 parts of CaCO 3 , 17 parts of MgCO 3 , 11 Na 2 O and 34 Fe 2 o 3 Prepared expansion agent and 6wt% CaF 2 , Grinding into a mixed powder with a particle size of 0.04mm;

[0032] Step 3: Extrude and granulate the mixed powder in step 2 into ceramsite raw meal under 65MPa;

[0033] Step 4: heating at a rate of 10°C / min, preheating at 500°C for 40 minutes, baking at 1000°C for 70 minutes, calcining at 1300°C for 60 minutes, and then lowering to room temperature at a rate of 7°C / min to obtain the lightweight porous ceramsite.

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Abstract

The invention discloses a technology for manufacturing light porous ceramisite from sludge. The technology comprises the following steps that 1, under the temperature of 100-140 DEG C, sludge is driedtill the water content is 30-40%; 2, sludge, kaolin, an expanding agent and CaF2 are ground into mixed powder; 3, the mixed powder is extruded and granulated to form ceramisite raw materials; 4, thetemperature is increased at the rate of 5-10 DEG C / min, preheating is performed at the temperature of 200-500 DEG C for 30-40 min, baking is performed at the temperature of 500-1,000 DEG C for 50-70 min, and calcinating is performed at the temperature of 1,000-1,300 DEG C for 50-60 min, wherein the expanding agent is prepared from 20-24 parts of CaCO3, 13-17 parts of MgCO3, 7-11 parts of Na2O and30-34 parts of Fe2O3. The sludge harmless, minimized, stabilized and recycled reutilization can be achieved, the produced ceramisite is high in stability, compressive strength and porosity and low indensity, the technology has the good heat preservation, sound insulation and permeation prevention effect, and the ceramisite can be mixed with concrete to be adopted as a building material.

Description

technical field [0001] The invention relates to the technical field of sludge building materials, in particular to a process for making lightweight porous ceramsite from sludge. Background technique [0002] At present, composting technology, aerobic fermentation technology and anaerobic digestion technology are the main ways to treat sludge, but the effective utilization rate of sludge is low, and the potential value of sludge cannot be fully explored, resulting in waste of resources and pollution. Heavy metals in mud are difficult to fix, causing secondary pollution. Sludge building materials technology utilizes sludge sintering to make building materials such as bricks, cement and ceramsite, but sludge ceramsite has less micropores, lower strength and relatively higher density, so its stability and thermal insulation are poor . The patent application number is CN201710055896.7. Mix 30-70% sludge, 20-60% clay and 10-15% bauxite evenly, then age, dry, granulate and calcin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/00C04B33/13C04B33/132
CPCC04B33/131C04B33/1321C04B38/0025C04B38/009C04B2235/3201C04B2235/3206C04B2235/3208C04B2235/3272Y02P40/60
Inventor 卢显人龚俊杰尹诏辛明祥
Owner 安徽摩诃环保科技有限公司