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Limestone is a common type of carbonate sedimentary rock. It is composed mostly of the minerals calcite and aragonite, which are different crystal forms of calcium carbonate. Limestone forms when these minerals precipitate out of water containing dissolved calcium

Limestone is a sedimentary rock composed primarily of calcium carbonate (CaCO3) in the form of the mineral calcite. It often contains other minerals, such as clay, dolomite, and silic
Appearance: Limestone can vary in color from white and gray to tan, brown, and even black. Its appearance can be influenced by impurities, organic materials, and the type of minerals present.
Uses:
Construction: Limestone is widely used as a building material for flooring, walls, and facades due to its durability and aesthetic appeal.
Industry: It is used in various industries, such as cement production, where it serves as a key ingredient in the manufacturing of Portland cement.
Agriculture: Limestone is used to improve soil quality by neutralizing acidity, providing essential nutrients like calcium, and promoting plant growth.
Chemical Industry: It is used in the production of lime, which has applications in various chemical processes.

Wooden Doors And Door Frames Full KD Prosess
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To get quality pieces of wood is not enough to have high-tech machinery alone. We think about it from the selection of raw materials, pieces of wood by experienced experts in their fields to the process of wood covenants. After we process the raw materials into finished products such as flooring, decking, lumbersharing, stairs, doors, tables, chairs, pergola, gazebos, and various other custom products in accordance with the provisions of the High Standard Quality Control that we have in inspecting each of our production results.
The front door is often the focal point of a home exterior a door is the first thing guests see when they arrive, it's the last thing they contemplate after leaving. Pt nifinternasional produces a complete line of wooden door to fit your architectural design, either classic door or modern contemporary door. We also manufacture wood door based on your custom made design.

Magnesia Bricks Description
Magnesia Bricks are alkaline refractory materials. These products have over 90% magnesium oxide content and adopt periclase as the principal crystalline phase. Magnesia Bricks can be divided into two categories of Burnt Magnesia Bricks and Chemical Bonded Magnesite Brick. They have excellent performance of superior high temperature mechanical strength and volume stability. Magnesia Bricks can service in the high temperature of 1750.. They are ideal products for glass furnace application.

Magnesia Bricks Features:
It is a kind of alkaline refractory product with periclase as main phase magnesite-alumina spinel clinker as basic material. the product has such characteristics as good temperature vibration, good strength and volume stability in high temperature.

Magnesia Bricks Application

Basic open-hearth furnace for steelmaking

Electric furnace bottom and wall

Permanent lining of oxygen converter

Non-ferrous metal metallurgy furnace

Hyperthermia tunnel kiln

Lining of rotary cement kiln

Heating furnace bottom and wall

Regenerative chamber of glass furnace

Magnesia Bricks Properties

High Refractoriness

Good alkaline slag erosion resistance

High apparent initial softening temperature

Good thermal conductivity

High thermal expansion

Magnesia Bricks Manufacturing Process

Burnt Magnesia Bricks are manufactured with magnesite clinker as the raw material and fired in the high temperature of 1550~1600 after smashing, burdening, mulling and molding. High-purity products can be fired in the temperature that over 1750. Chemical bonded magnesite brick is produced with certain chemical bonding through mixing, molding and drying.