Molekul (Nov 2015)
SYNTHESIS AND CHARACTERIZATION OF BLACK, RED AND YELLOW PIGMENT MADE FROM IRON SANDS
Abstract
Synthesis and characteristics of the black, red and yellow pigment made from iron sand have been done. The purpose of this research is performing the synthesis and characterization of pigments using raw materials of iron sands using calcination methods. The manufacture of black pigment was done by mixing iron sand with a solution of NaOH and NH4OH then heating them at a temperature of 800 °C. The red pigment was made by dissolving iron sand in a solution of H2SO4 and it was heated at a temperature of 650 °C. While the yellow pigment was made of red pigment powder dissolved into a solution of HCl and heated at a temperature of 250 °C. Pigment powders were characterized by using XRD, SEM-EDX and PSA and Crommameter. The results showed that the black, red and yellow powder pigment have a cubic crystal structure with the form of the surface morphology and grain size as follows: the particles of the black pigment is uniform spherical granules with a grain size of 926.4 nm, the red pigment granules have a spherical shape with grain size of 72.2 nm and yellow pigments have a spherical shape with grain size of 349 nm. The main elements of black, red and yellow pigment are iron (Fe) and oxygen (O). From the result of pigment powder test using Crommameter it was found that L * a * b * and DE coordinat of black pigment were 23.76, 1.35, 1.43, 2.339, red pigment are 43.23, 16 , 17.3 and 9.893, and yellow pigment are 66.76, 14.84, 49.95 and 4.862. The pigment colors produced are in accordance with standards.
