T/NBEA 003-2019 Active Group standards

T/NBEA 003-2019 Surface-treated sludge sintering to make ceramic particles

Publish Date: 2019-11-01 Implement Date: 2019-12-01 For services related to genuine standard inquiry, procurement, translation, and other related services in China, please Contact Us

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Basic Information

Standard Code: T/NBEA 003-2019

Standard Type: Group standards

Standard Status: Active

is_force_gb: no

CCS Name: Metallurgical machinery and equipment

ICS Name: Other building materials

Publish Date: 2019-11-01

Implement Date: 2019-12-01

Scope

Main technical content: A brief introduction to the technology of firing sludge to produce ceramic granules: Sludge is a clay-based resource used to prepare ceramic granules (used as light aggregates to prepare lightweight concrete). During the high-temperature firing process, the sludge can be completely stabilized and heavy metals can be solidified, thereby making full use of the clay resources in the sludge. For ceramic granules to expand, two conditions must be met: ① When the raw material is heated to high temperature, a viscous glass phase must be formed, which can seal the gas released from the interior of the raw material; ② After the viscous glass phase is formed at high temperature, gas must be released. The material basis for the expansion of ceramic granules is gas. The raw material components in the greenware react to produce gas, creating gas pressure, while a viscous liquid phase on the surface of the greenware inhibits the escape of gas. The two factors together enable the ceramic granules to achieve ideal expansion. The escape of some gas forms many open pores on the surface of the greenware, increasing the adsorption capacity of the filter material and making it easy to form a biofilm, while some unescaped gas forms a porous structure inside the greenware. The process from room temperature to 1100°C is the preheating stage of the greenware. During this period, the bound water in the greenware evaporates, organic matter burns, and minerals decompose. Some gas escapes, while some gas is enclosed by mineral components and forms bubbles inside the raw material. Excessively long preheating time will cause the greenware to collapse, resulting in clogged pores and densified particles. When the temperature reaches about 1100°C, the greenware begins to exhibit liquid phase. Mineral components start to rearrange and transfer mass through atomic rearrangement and crystal plane slippage, rapidly reducing pore size. When the temperature reaches 1200°C, some CO2