1 Scope
This standard specifies the determination for sphericity of ion exchange resins after attrition or osmotic-attrition.
This standard is applicable to the determination for sphericity of various globular ion exchange resins after attrition or osmotic-attrition.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this standard. At the time of publication, the editions indicated were valid. All standards are subject to revision, and parties to agreements based on this standard are encouraged to investigate the possibility of applying the most recent editions of the standards indicated below.
GB/T 5475-1985 Methods for sampling ion exchange resins
GB/T 5758-2001 Determination for particle size range, effective size and uniformity coefficient of ion exchange resins
3 Definitions
For the purposes of this standard, the following definitions apply.
3.1
sphericity after osmotic-attrition
the resin is subjected to a osmotic force by treating with acid or alkali of certain concentration, and then is subjected to pressure and friction by attriting with porcelain balls and the resin subjected to the above three kinds of forces is then dried to roll freely and separate, wherein the mass fraction of spherical particles in the sample is the sphericity after osmotic-attrition
3.2
sphericity after attrition
after being subjected to pressure and friction by attriting with porcelain balls, the resin is dried to roll freely and separate, wherein the mass fraction of spherical particles in the sample is the sphericity after attrition
