LIBO rate

Abstract: In this paper the sphene-pink pigment with and without different mineralizers has been synthesized in order to know the best additive and proportion in which it has to be added. Characterisation of samples by X-ray diffraction indicates that samples without mineralizers exhibit peaks of small intensities assigned to the sphene structure after firing at 1300 °C/2h. The addition of H 3 BO 3 points out that the synthesis of the above compound takes place at lower temperatures and establishes the best proportion in which Cr 2 O 3 could be added. In order to improve the synthesis of the sphene pigment, LiBO 2 , Li 2 CO 3 and H 3 BO 3 -Li 2 CO 3 have been employed. Results obtained by X-ray diffraction and colour measurements show that LiBO 2 is the best additive tested for sphene-pink synthesis. The influence of quantities of LiBO 2 and Cr(VI), as well as B contents in the washing liquids have also been established.