Know "sepiolite"

Sepiolite is a fibrous hydrous magnesium silicate, usually white, light gray, light yellow and other colors, opaque and no luster. Some of them are shaped like clods, and some have a strange hull shape or tuberculosis. Under the electron microscope, it can be seen that they are gathered in a sheet form by numerous filaments. Sepiolite has a strange feature. When they encounter water, they absorb a lot of water and become soft. Once they are dry, they harden.

nature

Sepiolite is an aqueous magnesium-rich silicate clay mineral with a layered chain structure. Orthorhombic or monoclinic, generally massive, earthy or fibrous aggregates. The color is white, light gray, dark gray, yellow brown, rose red, light blue green. The fresh noodles are pearly luster and are earthy, shiny after weathering. Hardness 2 ~ 3, density 2 ~ 2.5g/cm3. With a sense of slippery and astringent, sticky tongue. Dry and brittle in the dry state. Low shrinkage, good plasticity, large surface area and strong adsorption. Soluble in **, light weight. Sepiolite also has properties such as decolorization, heat insulation, insulation, corrosion resistance, radiation resistance and thermal stability. It is mainly produced in marine sedimentary-weathering type deposits; it also appears in hydrothermal veins.

Introduction

Yangzhuang - Messianite deposits are produced in the back layer sequence of the Wufushan Giant Cyclone. Sepiolite is a fibrous magnesium-rich clay mineral (Meershaum in English, the English name Spilite), and sepiolite is classified into two types: alpha sepiolite and beta sepiolite according to its crystal form. The former is a large bundle of fibrous crystals, it is also known as fibrous sepiolite. The latter, from 1986 to 1996 through X-ray diffraction analysis of specimens of "Xingmu", confirmed that it is a rare ancient (Mesoproterozoic) deposited sepiolite deposit in the world.

The formation of sepiolite formed or altered by serpentine. Sepiolite itself is non-toxic and harmless, but since sepiolite is altered by serpentine and serpentinite is the main component of asbestos, it is difficult to separate sepiolite from asbestos. The sepiolite will contain a small amount of asbestos, the proportion of about 5% to 30%. Sepiolite is mainly used to make pipes. China's Jiangxi Leping, Hunan Liuyang and other places have output. Yakulling, Leping, Jiangxi Province is the first discovery of sepiolite in China. The geological survey of sepiolite clay began with Zhang Renjun. In 1947, he named “refractory clay” as sepiolite based on the chemical analysis and decolorization effect, and discussed the cause of the deposit.

chemical components

Sepiolite is orthorhombic or monoclinic; color is variable, generally pale or gray; silky luster, sometimes waxy luster; streak is white, opaque, smooth and sticky tongue; Hardness between 2 and 2.5; light weight, density of 1 ~ 2.2g/cm3; low shrinkage, good plasticity, soluble in **.

The chemical composition of sepiolite is silicon (Si) and magnesium (Mg); its standard crystal formula is Mg8(H2O)4[Si6O16]2(OH)4·8H2O, and the content of SiO2 is generally between 54~60%. The MgO content is mostly in the range of 21 to 25%.

Sepiolite has a strong adsorption, decolorization and dispersion properties, also has a high thermal stability, high temperature resistance up to 1500 ~ 1700 °C, modeling, insulation, resistance to salinity are very good.

Physical properties

(1) Appearance: The color is changeable, white, light yellow, light gray, black and green, the bar is white, opaque, smooth and sticky.

(2) Hardness: 2-2.5

(3) Specific gravity: 1-2.3

(4) High temperature resistance: At a high temperature of 350 degrees, the structure does not change and the high temperature performance reaches 1500 to 1700 degrees.

(5) Suction: absorbs water greater than 150% of its own weight

The main purpose

According to statistics, there are more than 130 kinds of sepiolite used, making it one of the most widely used mineral raw materials in the world today.

application:

Main application areas

Oil-petroleum scouring sorbent, bleaching agent, filter

Brewing, chemical sieves, chemical, sugar, winemaking

Pharmaceutical ion exchangers, purifiers, brighteners

Ceramic enamel raw material environmental particle detergent and adsorbent

Casting sand binder

High-quality raw materials for special high temperature resistant coatings of silicate high-magnesium refractory

Plastic foaming spirit and decoloring agent

Building sound insulation, heat insulation material, paint

Rubber special filling agent

Electrode welding flux ingredients

Textile and chemical catalysts, suspending agents, thickeners and thixotropic agents

Tobacco ** filter raw materials

Special paper catalytic carrier and adsorbent

National Defense Modern Science Special ceramic components for nuclear, rocket, and satellite

Agricultural pesticides, carrier materials for soil disinfection, preparation of special raw materials, preparation of animal pesticides, livestock washers

Crafts Carving Crafts, Decorations and Living Goods

The pipe sepiolite is light and has good heat dissipation. Because of its fine and soft stone, it can be carved on the outside wall with very delicate and detailed relief patterns (generally drawn from the myths of ancient Greece and ancient Rome, as well as animals, plants and figures). ), with high artistic value. This is also one of the places where it is superior to Heather Root. The sepiolite pipe has been used for a long time. Under the joint action of ** and hand sweat, it will give off natural, deep and noble brown gold (heather root has similar characteristics, but because the sepiolite itself is milky white, it is discolored. More obvious than the former.) The best quality sepiolite is Eskishehir, which is produced in the middle of Turkey. In addition, Tanzania in East Africa also produces. Cigarettes are generally made of natural/synthetic amber, or animal's horns and bones. Because of its special nature, sepiolite is more suitable as a material for making pipe; on the other hand, because of its fragile texture and fragile nature, it is only suitable for senior pipe-dust hoppers.

Drilling salt and high temperature special mud.