Using "High-Alumina Materials" to Produce High-Alumina Cement

Raw material requirements. Generally, the Al2O3 content is required to be 40% or above, and common sources include bauxite, high-aluminum tailings, etc. In addition, an appropriate amount of limestone (to provide CaO) and a small amount of gypsum (to adjust properties such as setting time) are required as auxiliary raw materials. But what we are going to introduce today is a more cost-effective raw material-high-aluminum material (aluminum ash harmless product). Its Al2O3 content is ≥60%, which meets the requirements for the preparation of high-aluminum cement. At the same time, it contains a certain amount of CaO, which can appropriately reduce the addition of auxiliary raw materials. Moreover, the price of this raw material is suitable, which can reduce costs and improve economic benefits for companies producing high-aluminum cement!

Rongsheng High-Alumina Cement Manufacturer

Production Process Steps

Raw material crushing and grinding: ensure better chemical reaction between subsequent raw materials ( https://highaluminarefractory.com/alumina-raw-materials/ ) and improve reaction efficiency. Because the high-aluminum material itself has a finer particle size, it does not need to be crushed, and only needs to be slightly ground to adjust the particle size. Only some auxiliary raw materials need to be crushed and then ground. Compared with the use of raw materials such as bauxite and high-aluminum tailings, the use of high-aluminum materials can greatly reduce production energy consumption and reduce costs.

Batching and calcination: According to the target chemical composition and performance requirements of high-aluminum cement, the proportion of high-aluminum materials, limestone, gypsum and other raw materials is accurately calculated and blended to ensure that the two can generate a suitable calcium aluminate phase in the subsequent calcination process. After the prepared raw materials are evenly mixed, they are sent to calcination equipment such as rotary kilns for high-temperature calcination, and various parameters are strictly controlled. During calcination, the various components undergo complex chemical reactions, mainly generating calcium aluminate minerals. It is the key mineral component of high-aluminum cement with characteristics such as early strength and high strength.

Cooling and grinding: The calcined clinker needs to be cooled quickly, and the commonly used cooling methods are air cooling and water cooling. Avoid adverse phase changes during the slow cooling process to ensure the stability of the performance of high-alumina cement. The cooled clinker is sent to the grinding equipment again together with an appropriate amount of gypsum to grind the clinker to a specified fineness. Generally, the specific surface area is required to reach a certain value. For example: about 300~500m2/kg. So that the finished cement has good performance.

Product Features and Applications

① It has a fast setting and hardening speed and can reach a high strength in a short time. This makes it have obvious advantages in projects that need to be constructed quickly and put into use as soon as possible. For example, it can be used in emergency repair projects to ensure the timeliness and practicality of the project.

② It has good heat resistance and can be prepared into amorphous refractory materials such as refractory castables and refractory mud. It is used in occasions with high temperature environment requirements, such as the lining of high-temperature kilns and the foundation of thermal equipment.

③ It has strong corrosion resistance and has good resistance to corrosive media such as sulfates. For example, it can be used for the ground of chemical workshops and the structure of sewage treatment facilities to improve the durability of buildings.

④ Large hydration heat: In low temperature environments, its large hydration heat can accelerate the hydration reaction of cement and improve the early strength of concrete. It is suitable for concrete projects constructed in winter, which can reduce the risk of freezing of concrete and ensure the quality of the project.

In short, the preparation of high-aluminum cement by replacing bauxite with high-aluminum materials can bring greater economic benefits to enterprises, and the products produced are of good quality, which has important application value in many fields!