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Alumina Processing Process

Hangzhou JWG Technology Co.Ltd | Updated: Oct 09, 2017

Aluminum bauxite (commonly known as high alumina clay or high bauxite) refers to a mineral containing refractory clay. Refractory clay, refers to the refractor degree greater than 1580 ℃, can be widely used in a variety of industrial furnace lining materials, the main component of aluminosilical mineral raw materials, according to its physical and chemical properties, ore structure and industrial characteristics, Divided into soft and semi-soft clay, hard clay and high alumina clay. Soft clay is generally soil-like. Low hardness, easy to fly in water, after the formation of plasticity can be plastic mud group, with strong adhesion, commonly used as a refractory products, alumina content of less than 35%. Semi-soft clay is poorly finely dispersed, or partially submerged, and the contaminated portion is mixed with the liquid to form a plastic clay, which is often used as a binder and as a binder. Hard clay is usually massive or plate-like, generally not in the water, do not have plasticity, alumina content of 36% to 50%, refractoriness 1670 ℃ ~ 1770 ℃, mainly used for the production of clay refractory products.

High alumina clay The main mineral is alumina, and bauxite as a mineral, because of its chemical composition varies, or is a symbiotic ore, internationally collectively referred to as bauxite

Bauxite, also known as bauxite or bauxite, the main mineral composition of water diaspore, boehmite, gibbsite, is a Mohs hardness of 1 to 3 between the ore, usually Smelting aluminum and the production of refractories the most commonly used raw ore, the main component is alumina, the Department of impurities containing hydrated alumina, is a kind of soil minerals. Density 3.9 ~ 4g / cm3, opaque, crisp, extremely difficult to melt, insoluble in water, soluble in sulfur.

Bauxite processing technology

1. High temperature calcination: raw materials into the calciner for high temperature calcination, some can also be used to dry the way.

2. Crushing and milling: The calcined material is crushed by a jaw crusher or a hammer crusher and then sent to a Raymond Mill. After the broken material into the mill production system, the entire milling, grading and other operating processes are completed in the milling machine automation, machine personnel should pay close attention to electronic control cabinet instrument data. Qualified bauxite powder released by the discharge valve, packaging products.

Bauxite processing equipment

Calcining equipment: bauxite rotary kiln, the equipment calcination mechanism is advanced, the production of finished products of high quality, the overall operation of a high degree of automation, safety and environmental protection.

Crushing equipment: jaw crusher or hammer crusher, large particles of bauxite crushed.

Milling equipment: the general use of bauxite Raymond has been able to meet the needs of bauxite powder particle size, uniform milling.

From the perspective of chemical structure of bauxite can be divided into three categories, a water hard alumina, a soft alumina and water three soft alumina. China's bauxite belongs to the hard aluminaite, while Brazilian and Guyana's bauxite is saprolite.

According to the physical and chemical properties of the difference. According to the main purpose can be divided into four categories:

(1) metallurgical grade bauxite refers to the extraction of aluminum or smelting alumina bauxite used, in general, aluminum and silicon ratio should be greater than 2.6 before use.

(2) grinding grade bauxite is mainly used for the production of high-alumina cement and abrasive, abrasive.

(3) refractory bauxite for the production of various shaped and unshaped refractories.

(4) welding grade bauxite industry for the production of welding electrodes.


Hangzhou JWG Technology Co.Ltd