120目铬铁矿砂价格 炼钢厂用铬铁矿砂 精密铸造不粘连铬铁矿砂

铬铁矿砂简介

      铬铁矿砂具有磁性，可以用磁选机辅助选矿，分耐火级和冶金级。铬铁矿砂又称铬矿砂，铬铁矿砂是铸造用特种砂，是以铬铁矿为主的天然尖晶石，经破碎、筛分成规定粒度，适用于造型（制芯）的砂。 铬铁矿砂在铸造生产中主要用于大型铸钢件的面砂，防止铸件表面粘砂；其次将其磨粉用于铸造涂料的耐火骨料；铬铁矿砂是激冷材料，在造型（制芯）时可替代部分冷铁。

Chromite sand are magnetic, magnetic separator can be used auxiliary separation, refractory and metallurgical. Chromite sand is also called the chrome ore, chromite sand is sand casting with special, natural spinel, of chromite on particle size by crushing, screening regulation, applicable to modelling (core) sand. Chromite sand in foundry production is mainly used for large steel surface sand, prevent casting surface adhering sand; Secondly the grinding powder used in casting coating refractory aggregate; Chromite sand is chilling material, when modelling (core) alternative part cold iron.

      铬铁矿砂不是纯金属或纯合金，它含有较多的杂质；铬铁多以氧化物的形态存在于矿砂中，氧化物颜色大多呈黑褐色。所以，铬铁矿砂是黑色的。铬铁矿砂其主要化学成分为cr2o3，这种砂受热体积稳定，热导率高，与熔融金属接触时，不仅有很好的抗碱性渣作用，不与氧化铁等起化学反应，而且本身具有固相烧结的特点，能很好的防止熔融金属的渗透，避免产生沾砂缺陷，适用于各种不锈钢、合金钢和碳素钢逐渐造型制芯的原砂和涂料。

Chromite sand is not a pure metal or alloy, it contains many impurities; Ferrochrome exists in the form of oxide in ore more, most of oxide color is dark brown. So, chromite sand is black. For cr2o3 chromite sand, its main chemical composition, the sand heated volume stability, high thermal conductivity, when in contact with the molten metal, not only has good resistance to basic slag, not with ferric oxide and other chemical reactions, and itself has the characteristics of the solid phase sintering, can be a very good prevent the infiltration of molten metal, avoid to touch sand defects, suitable for all kinds of stainless steel, alloy steel and carbon steel gradually shape the original sand core and coating.

      铬铁矿砂按化学成分分为2级；一级Cr2O345;二级Cr2O335。常用粒度：20  40  60  80  100  120  200  325目等系列铸造级。

Chromite sand according to chemical composition can be divided into level 2; Level 1 Cr2O3 45 or more; The secondary Cr2O3 35 or higher. Commonly used size: 40 to 60 20 80 100 120 200 325 mesh series, such as casting level.

铬铁矿砂特性

      明悦铬铁矿砂在造型材料中属于特种砂的范畴，其主要矿物组成为FeO.Cr2O3，密度为4.04.8g/cm3，莫氏硬度为5.56级，耐火度大于1900，铬铁矿砂有很好的抗碱性渣的作用，不与氧化铁等发生化学反应。由于铬铁矿砂热导率比硅砂大好几倍，而且在熔融金属浇注过程中发生固相烧结，从而有利于防止熔融金属的渗透。

      1、铬铁矿具有优良的激冷特性，这种特性不减少热裂，但能影响温度梯度，促进方向性凝固而不需用冷铁。 

      2、铬铁矿是惰性的，因而不和其它金属氧化物发生反应，它不被锰钢水润湿。锰钢铸件能很成功的使用铬铁矿砂。如果铸型是正常地刷涂料并且氧化硅含量低，则没有铁橄榄石反应。

      3、铬铁矿的线膨胀小，而线膨胀是一个可能引起铸件夹砂的因素，因此它可能用来混制大铸件用的湿砂型。

MingYue chromite sand belongs to the category of special sand, in the molding materials. Its main mineral composition of FeO Cr2O3, density is 4.0 4.8 g/cm3, mohs hardness is 5.5 6 grade, more than 1900 , refractoriness chromite sand has good resistance to basic slag, does not react with iron oxide, etc. Because of the chromite sand thermal conductivity for several times larger than that of silica sand, and solid phase sintering occurred in the process of molten metal casting, thus to prevent infiltration of molten metal.

1, chromite has excellent chilling features, this feature does not reduce the hot crack, but it can affect the temperature gradient, promote the directional solidification and don