Boron Recovery from Borax Sludge, Boron Industrial Waste, by Solid−Liquid Extraction

Abstract

The recovery of boron from borax sludge by solid−liquid extraction was investigated using 23 factorial experimental design. Distilled water and sulfuric acid were used as extraction solvents. The effects of solid-to-liquid ratio, reaction time, and reaction temperature were investigated for extraction with distilled water. The effects of solid-to-liquid ratio, reaction time, and solvent concentration were investigated for extraction with sulfuric acid. The interaction among the operating parameters and their relative significance were studied. Regression equations were established for both solvents, and the extraction was represented as a function of response variables. The accuracy of equations was verified by Fisher's adequacy test. It was found that the most effective parameter for the extraction process was solid-to-liquid ratio for both of the solvents. Maximum boron oxide extraction efficiency was obtained under the following working conditions: solid-to-liquid ratio, 1/120 g/mL; reaction time, 60 min; reaction temperature, 75 °C for distilled water; and solid-to-liquid ratio, 1/120 g/mL; reaction time, 60 min; solvent concentration, 1%, v/v; reaction temperature, 75 °C for sulfuric acid.

Removal of boron from aqueous solution by adsorption on Al2O3 based materials using full factorial design

“…The effects of pH and temper- Table 5 Values of model coefficients ature have a negative values, indicating that the amount of boron adsorbed decreased while the factor varied from low level to its high level [18,2]. The importance of each factor was determined by the F test method [2,3,[19][20][21]. Thus, unimportant factor affecting boron adsorption from aqueous solution can also be justified.…”

“…The variables used in our work are adsorbent type (Siral 30, Pural), pH of the solution (5.7, 9.5) and temperature (298 K and 313 K). The number of experiments conducted is considered as 2 3 . The two levels which correspond to each variable are taken in coded form as +1 and −1.…”

“…Boron compounds in this waste pass to soil; they form some complexes with heavy metals so that the potential toxicity of heavy metals increases. Thus, boron compounds cause some serious health and environmental problems, when the complexes pass to groundwater [3]. Boron(III) has virulence for reproduction and causes disease of the nervous system [4].…”

“…The most important advantages are that not only the effects of individual parameters but also their relative importance in given process are obtained and that the interactional effects of two or more variables can also be known. This is not possible in a classical experiment [13,14,3]. In this study, adsorption and desorption of boron from aqueous solution onto Pural and Siral 30 was investigated.…”

Thermodynamic analysis and experimental studies of magnesium extraction from szaibelyite-suanite ore by aluminium

“…Many studies have been performed on boron recovery from boron-containing waste materials (Özdemir and K1pçak, 2007;Wang 2012;Özdemir and K1pçak, 2003). Some studies have focused on the preparation of magnesium sulphate, refractory materials, and fire retardants.…”