Preparation of a mixed-phase pigment based on iron oxide and chromium
oxide
    2.
    发明授权
    Preparation of a mixed-phase pigment based on iron oxide and chromium oxide 失效
    基于氧化铁和氧化铬的混合颜料的制备

    公开(公告)号:US4643772A

    公开(公告)日:1987-02-17

    申请号:US762204

    申请日:1985-08-05

    摘要: A process for the preparation of a mixed-phase pigment based on iron oxide and chromium oxide by heating a mixture of the oxides, hydroxides or oxide hydroxides of iron and of chromium at from 600.degree. to 1100.degree. C. and then comminuting the product and working it up in a conventional manner. The essential feature of the invention is that a mixture of transparent .alpha.-iron oxide having an orthorhombic bipyramidal crystal structure and a chromium(III) hydroxide, which has been applied onto the transparent iron oxide by precipitation with an alkali, preferably sodium carbonate, is heated.The pigments according to the invention give deep colorations and are readily dispersible.

    摘要翻译: 一种通过在600℃至1100℃下加热铁和铬的氧化物,氢氧化物或氧化物氢氧化物的混合物来制备基于氧化铁和氧化铬的混合颜料的方法,然后粉碎产物和 以常规方式进行处理。 本发明的主要特征是通过用碱(优选碳酸钠)沉淀将已经施加到透明氧化铁上的具有正交双锥体晶体结构的透明α-氧化铁和氢氧化铬(III)的混合物是 加热。 根据本发明的颜料赋予深色,容易分散。