It is remarked that in magnetophoresis (one form of which is magnetic separation, which is used in different industries, including glass and ceramic) information on the magnetic susceptibility χ of magnetically active particles, which depends on the intensity H of the applied field, is just as fundamental as information on fractional content of the particles. Data obtained on χ for iron-containing impurity particles of quartz sand from measurements of the magnetic susceptibility of their powder samples are presented. It is shown that the parameter χ, which is inversely dependent on H with exponent close to 0.75, significantly suppresses the role of the parameter H appearing in the basic expression for the magnetic force gripping the particles. It is recommended that in developing a magnetophoresis (separation) apparatus attention should be focused on not so much the parameter H but rather the parameter—gradH that characterizes the nonuniformity of the field and plays a more role in the gripping of the particles.

中文翻译：

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颗粒的磁化率在磁致伸缩中的实际作用（磁分离）

值得注意的是，在磁泳（磁分离的一种形式，用于包括玻璃和陶瓷的不同行业的磁分离）中，关于磁活性粒子的磁化率χ的信息取决于所施加的场强H。和关于粒子分数含量的信息一样重要。给出了通过测量其粉末样品的磁化率获得的有关石英砂中含铁杂质颗粒的χ数据。结果表明，参数χ与H成反比，指数接近0.75，它显着地抑制了参数H的作用。在基本表达式中出现了磁力吸附颗粒的现象。建议在开发磁熔（分离）设备时，应注意的不是参数H，而是参数grad H，它代表磁场的不均匀性并在颗粒的吸附方面起更大的作用。