珪灰石

危険有害性情報のコード(GHS)

• 絵表示(GHS)

  

• 注意喚起語

  Warning

• 危険有害性情報

  H319：強い眼刺激

  H335：呼吸器への刺激のおそれ

• 注意書き

  P264：取扱い後は皮膚をよく洗うこと。

  P264：取扱い後は手や顔をよく洗うこと。

  P280：保護手袋/保護衣/保護眼鏡/保護面を着用するこ と。

  P305+P351+P338：眼に入った場合：水で数分間注意深く洗うこと。次にコ ンタクトレンズを着用していて容易に外せる場合は外す こと。その後も洗浄を続けること。

珪灰石 価格

珪灰石 化学特性,用途語,生産方法

• 解説

  硅灰石化学成分CaSiO3の鎖状構造をもつ準輝石に属する三斜晶系の鉱物。比重2.92，モース硬度4.5～5，融点1512℃，白色繊維状あるいは細粒結晶の集合塊。へき開は｛100｝に顕著，｛001｝や｛02｝にも強い。ほかに単斜晶系のパラケイ灰石parawollastoniteをはじめいくつかの多型構造がある。1150℃以上では同質異晶の3員環(SiO3)3構造をもつ偽ケイ灰石pseudowollastoniteに転移する。

• 説明

  “Wollastonite” occurs as a calcium inosilicate mineral that may contain small amounts of Fe, Mg and Mn substituting for calcium.
  The manufactured salt is usually white. It forms within the earth when impure limestone is subjected to high temperature and pressure, sometimes in the presence of silica-bearing fluids as in metamorphic rocks. It is named after the English chemist and mineralogist William Wollaston (1766– 1828).
  Wollastonite crystallizes as a triclinic crystal with the space group, 1, and the lattice constants: a = 7.94? , b = 7.32 ? , c = 7.07 ? ; α= 90.03°, β = 95.37°, γ = 103.43° and six formula units per cell.

• 化学的特性

  White to brown, red, gray, yellow solid; vitreous to pearly luster. Mohs hardness 4.5–5.

• 物理的性質

  Wollastonite occurs as bladed crystal masses, single crystals can show an acicular particle shape and usually it exhibits a white color, but sometimes cream, gray or very pale green. The melting point of wollastonite is about 1540°C.

• 使用

  Ceramics; paint extender; welding rod coatings; rubber filler; silica gels; paper coating; filler in plastics, cements, and wallboard; mineral wool; soil conditioner.

• 定義

  A natural calcium silicate found in metamorphic rocks.

• 調製方法

  Wollastonite is a natural calcium silicate that typically occurs in deposits with other silicate minerals. When crushed, it tends to cleave into particles that have length to diameter ratios of 7 or 8 to 1. Fibrous forms of wollastonite are not uncommon.

• 一般的な説明

  White or slightly cream-colored powder. pH (aqueous slurry) 8.0 to 10.0.

• 空気と水の反応

  Insoluble in water.

• 反応プロフィール

  These substances undergo chemical reactions only under relatively severe circumstances or in the presence of an effective catalyst that promotes reaction. They are resistant to ignition, although they may become flammable at very high temperatures. They will be resistant to oxidation/reduction, except in the most severe conditions. These materials may be nontoxic.

• 危険性

  Questionable carcinogen

• 火災危険

  Flash point data for CALCIUM SILICATE are not available; however, CALCIUM SILICATE is probably nonflammable.

珪灰石 上流と下流の製品情報

珪灰石 生産企業

Global(91)Suppliers

13983-17-0, 珪灰石 キーワード