METHOD OF DIAMOND SELECTIVE GRINDING Russian patent published in 2013 - IPC C01B31/06 C30B29/04 B02C19/18 B24D3/00 B24D3/10 

FIELD: process engineering.

SUBSTANCE: invention relates to diamond grinding in making diamond rock cutting tool. Proposed method comprises processing the diamonds in velocity layer of magnetic fields together with ferromagnetic particles. Mix composed of ferromagnetic particles and diamond grains fills the cylindrical case by 0.25-0.35 of its volume. Diamond magnetic susceptibility is defined by the relationship: $$X_1\ge \frac{g{R}_1{\left(R_1+R_2\right)}^2}{24{\mu }_0{\rho }_2{R}_2^2{H}^2{X}_2}$$ , where X₁, X₂ are diamond and ferromagnetic particle magnetic susceptibility, m³/kg; g is acceleration of gravity, m/s²; R₁, R₂ are diamond and ferromagnetic particle grain radii, m; µ₀ is magnetic permeability of vacuum, (µ₀=4π·10⁷ G_N/m); ρ₂ is ferromagnetic particle density, kg/m³; H is magnetic field intensity, A/m. Note here that the relationship between diamond grain weight and that of ferromagnetic particles makes 0.51-0.61.

EFFECT: higher efficiency of grinding and quality of finished diamonds.

1 cl, 2 tbl, 1 ex