digital divide network - article database

The main raw materials used in the cement manufacturing procedure are limestone, sand, shale, clay, and iron ore. The primary material, limestone, is generally mined on site whilst the other minor materials might be mined either on site or in nearby quarries. Another source of raw supplies is industrial by-products. The use of by-product materials to replace natural raw supplies is a key element in achieving sustainable improvement.

Raw Material Preparation

Mining of limestone requires the use of drilling and blasting techniques. The blasting methods use the newest technology to insure vibration, dust, and noise emissions are kept at a minimum. Blasting produces materials in a wide range of sizes from approximately 1.5 meters in diameter to little particles less than a couple of millimeters in diameter.

Material is loaded at the blasting face into trucks for transportation towards the crushing plant. Via a series of crushers and screens, the limestone is reduced to a size much less than 100 mm and stored till required.

Based on size, the minor materials (sand, shale, clay, and iron ore) might or may not be crushed before becoming stored in separate locations till needed.

Raw Grinding

In the wet procedure, each raw material is proportioned to meet a desired chemical composition and fed to a rotating ball mill with water. The raw materials are ground to a size exactly where the majority of the materials are less than 75 microns. Supplies exiting the mill are known as “slurry” and have flowability characteristics. This slurry is pumped to blending tanks and homogenized to insure the chemical composition of the slurry is right. Following the homogenization process, the slurry is stored in tanks till needed. As the professional manufacturer of complete sets of mining machinery, such as stone production line, Henan Hongxing is always doing the best in products and service. impact crusher:http://www.crusher-machine.com/2.html
raymond mill:http://www.crusher-machine.com/13.html

Within the dry procedure, every raw material is proportioned to meet a desired chemical composition and fed to either a rotating ball mill or vertical roller mill. The raw materials are dried with waste procedure gases and ground to a size where the majority of the supplies are less than 75 microns. The dry materials exiting either kind of mill are called “kiln feed”. The kiln feed is pneumatically blended to insure the chemical composition of the kiln feed is nicely homogenized after which stored in silos till required.

Finish Grinding and Distribution

The black, nodular clinker is stored on site in silos or clinker domes till needed for cement production. Clinker, gypsum, along with other process additions are ground together in ball mills to form the final cement goods.

Fineness of the final products, quantity of gypsum added, and the amount of process additions added are all varied to develop a desired efficiency in every of the final cement goods.

Every cement item is stored in an individual bulk silo until needed by the customer. Bulk cement can be distributed in bulk by truck, rail, or water based on the customer’s requirements. Cement may also be packaged with or without color addition and distributed by truck or rail.