Company News
2026.02.03
What are the recommended construction temperature and curing time for refractory castables?
The construction temperature and curing time for refractory castables must be matched to the material type and ambient temperature. The core principle is: "Primarily carry out construction at room temperature; special precautions are required for low- or high-temperature conditions. Ensure proper rigid curing and strictly prohibit premature demolding or baking." The parameters for different types of castables represent general standards applicable to industrial construction, and can be adjusted according to the product’s technical specifications. The key parameters are as follows: First, the core construction temperature requirements: The optimal construction environment is between 5℃ and 35℃. At this temperature range, the binder hydrates well and the material body sets and hardens effectively, ensuring the density and strength development of the castable.
2026.01.12
During the drying process of high-alumina bricks, how can we prevent cracking in the brick blanks?
Drying of high-alumina brick blanks is a stage prone to frequent cracking. The primary causes include uneven moisture evaporation, sudden changes in thermal stress, and inherent raw material or structural issues within the brick blanks themselves. To systematically prevent these issues, it’s essential to take a comprehensive approach that balances production standardization with operational feasibility, as detailed below: 1. Core Process Control: Employ a staged drying process featuring gradient temperature rise combined with controlled humidity removal. The process is divided into four stages: preheating, constant-rate drying, decelerated drying, and final drying. Starting from room temperature, increase the temperature by 10–15°C every 2–4 hours, with the final temperature set between 100–150°C. Maintain an internal kiln hot-air temperature difference of ±5°C, gradually reducing the humidity from 60%–70% down to below 10%. The air velocity should be maintained at 0.5–1.5 m/s and ensure uniform airflow throughout the kiln. The drying duration should be adjusted according to the thickness of the brick blanks: thick bricks require 72–96 hours, while thin bricks need 24–48 hours; the final moisture content must be ≤1%.
2026.01.12
Brief Introduction to High-Alumina Bricks
High-alumina bricks are refractory bricks made from bauxite as the primary raw material, processed through batching, shaping, and high-temperature sintering. They belong to the alumino-silicate refractory material family, with an alumina content ranging from 48% to 90%. The higher the alumina content, the better the refractory performance and mechanical strength. These bricks are one of the widely used standardized refractory materials in high-temperature industrial applications. According to their alumina content, they can be classified into low-alumina (48%–55%), medium-alumina (55%–70%), high-alumina (70%–85%), and ultra-high-alumina bricks (≥85%), making them suitable for different high-temperature operating conditions.
2026.01.12
What is the production process flow for high-alumina bricks?
The production of high-alumina bricks centers on high-alumina bauxite as the primary raw material and involves six key processes: raw material processing → ingredient blending → forming → drying → high-temperature sintering → finished-product treatment. Throughout the entire process, strict control is required over raw material particle size, forming pressure, and sintering temperature to ensure the bricks’ fire resistance, strength, and density—qualities that perfectly meet the demands of high-temperature industrial applications. The specific process flow is as follows: Raw Material Processing: The core raw material is bauxite (selected and graded according to its alumina content), combined with a small amount of binders (such as soft clay) and sintering aids (such as silica powder). First, the raw materials are crushed into three particle sizes: coarse particles (5–10 mm), fine particles (1–3 mm), and fine powder (≤0.088 mm). These particles are then ground and screened to remove impurities, ensuring uniform particle size distribution and laying a solid foundation for achieving optimal brick density.
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whatsapp:+8615936268068
Phone:+86-15936268068
Email:zzjsrefractory@gmail.com
Address: Chengguan Industrial Zone, Xinmi City, Henan Province
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