Asbestos

1.Chrysotile
2.Amosite
3.Crocidolite
4.Anthophyllite asbestos
5.Actinolite asbestos
6.Tremolite asbestos

The main types of asbestos are:

(1) Serpentine subgroup asbestos. Also called fiber serpentine asbestos or Chrysotile. It is widely distributed in nature. Generally, the so-called asbestos refers to Serpentine subgroup asbestos. It is the fibrous crystal of Serpentine subgroup, accounting for 95% of the total output of asbestos. The chemical formula is 3MgO · 2SiO2 · 2H2O, with a theoretical content of 43.46% MgO, 43.50% SiO2, and 13.04% H2O. Before decomposition, it is green, yellow, gray, white, and other colors with silk or pearl luster. After decomposition, it is grayish white, with a fiber length of generally 1-20cm and a maximum length of over 200cm.

(2) Amphibole asbestos. It includes crocidolite, amosite, Anthophyllite asbestos, Tremolite asbestos, Actinolite asbestos and other species. Its iron and sodium content is much higher than that of Serpentine subgroup asbestos. It has good acid resistance and corrosion resistance, and has many special uses.

(3) Pyrophyllite asbestos. It is iron and calcium silicate Aluminate. The fiber length is relatively short, mostly 0.5~1cm, with good fiber

splitting and poor bending resistance.

(4) Brucite asbestos. The fibrous variety of Brucite mineral, with chemical composition of Mg (OH) 2, has good alkali resistance but poor acid resistance.

Serpentine subgroup asbestos
Also called fibrous Serpentine subgroup asbestos, or Chrysotile, its main components are silicon dioxide, magnesium oxide and Water of crystallization, and its Molecular formula is Mg6 [(OH) 4Si2O5]

2. Among them, MgO is 43.0%, SiO2 is 44.1%, and H2O is 12.9%.
Serpentine subgroup asbestos is white or gray, translucent; Hardness: 2.0~2.5, density: 2.49~2.53g/cm3, axial tensile strength: 3000Mpa, non magnetic, non-conductive, fire-resistant, alkali resistant, fiber tough and soft, with silk luster and good spinnability. The asbestos produced in the world is mainly Serpentine subgroup asbestos, accounting for about 95% of the world's asbestos production.
Asbestos tailings, namely Serpentine subgroup, is a rock with Serpentine subgroup mineral (3MgO · 2SiO2 · 2H2O) as the main component. Its theoretical composition is: MgO: 43%; SiO2: 44.1%; H2O: 12.9%. When calcined in conjunction with an appropriate amount of dolomite (CaCO3 · MgCO3), magnesia calcium based refractory materials with periclase as the main mineral and C3S and C2S as binders can be formed.

Amphibole
It includes crocidolite (also called blue asbestos or purple asbestos), amosite, Anthophyllite, Tremolite and Actinolite.
Blue asbestos: Chemical composition: Na2Fe5 [Si4O11] 2 (OH) 2, MgO: 1.37%; SiO2: 51.94%
Anthophyllite asbestos: (MgFe) 7 [SiO8O22] (OH) 2, MgO: 28~34%; SiO2: 56-58%
Tremolite asbestos: Ca2 (Mg~Fe) 5 [Si4O11] 2 (OH) 2, MgO: 0-30%; SiO2: 53-62%
Iron asbestos: (MgFe) 7 [Si4O11] 2 (OH) 2, MgO: 15.31%; SiO2: 54.33% [3]
The Amphibole asbestos is distinguished by its different contents of sodium, calcium, magnesium and iron. It should be noted that Serpentine subgroup and Amphibole minerals can have fiber structure or non fiber structure. Serpentine subgroup and Amphibole with fiber structure are called asbestos.

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