THE DESIGN AND ANALYSIS OF EXPERIMENTS. By Oscar Kempthorne. New York, John Wiley and Sons, Inc., 1952. 631 pp. $8.50. This book by a teacher of statistics (as well as a consultant for \"experimenters\") is a comprehensive study of the philosophical background for the statistical design of experiment. It is necessary to have some facility with algebraic notation and manipulation to be able to use the volume intelligently. The problems are presented from the theoretical point of view, without such practical examples as would be helpful for those not acquainted with mathematics. The mathematical justification for the techniques is given. As a somewhat advanced treatment of the design and analysis of experiments, this volume will be interesting and helpful for many who approach statistics theoretically as well as practically. With emphasis on the \"why,\" and with description given broadly, the author relates the subject matter to the general theory of statistics and to the general problem of experimental inference. MARGARET J. ROBERTSON

The Design and Analysis of Experiments

Metallurgical recovery of metals from electronic waste: a review.

Recovery of gold from secondary sources—A review

Calcite, dolomite and magnesite dissolution kinetics in aqueous solutions at acid to circumneutral pH, 25 to 150 °C and 1 to 55 atm pCO2: New constraints on CO2 sequestration in sedimentary basins

Study on the influence of various factors in the hydrometallurgical processing of waste printed circuit boards for copper and gold recovery.

The Taguchi method has been used to determine the optimum conditions for the dissolution of malachite ore in H2SO4 solutions. The chosen experimental parameters and their range were (i) reaction temperature: 15 to 45 °C, (ii) solid-to-liquid ratio: 1/10 to 1/3 g cm–3, (iii) acid concentration (in weight): 2 % to 10 %, (iv) particle size: –40 to –3.5 mesh, (v) stirring speed: 240 to 720 rpm, and (vi) reaction time: 5 to 45 minutes. The optimum conditions were found to be reaction temperature: 40 °C, solid-to-liquid ratio: 1/3 g cm–3, acid concentration (in weight): 10 %, particle size: –30 mesh, stirring speed: 480 rpm, and reaction time: 45 minutes. Under these optimum working conditions, the dissolution of copper and iron in malachite ore was 100 % and 58 %, respectively. Besides, alternative working conditions reducing the total cost and dissolution of iron were found.

Determination of the Optimum Conditions for Leaching of Malachite Ore in H2SO4 Solutions

The solubility of magnesite ore in citric acid, an environmentally friend and natural reagent, was investigated. The effects of reaction temperature, particle size and acid concentration were examined. The leaching rate increased with decreasing particle size and with increasing temperature. The dissolution in terms of acid concentration increased initially and then fell with increasing concentration. By testing shrinking core models for fluid-solid systems, it was observed that the dissolution of magnesite was controlled by chemical reaction. The following semi-empirical model was developed: 1 – (1 – x)1/3 = 6.4 × 107(D)–017(C)0.11e–61.35/RTt, where D is the particle size, C the acid concentration, T the reaction temperature and t the reaction time. The activation energy of the process was 61.35 kJ·mol–1.

Leaching Kinetics of Magnesite in Citric Acid Solutions

Leaching kinetics of sphalerite with pyrite in chlorine saturated water

Optimisation of the chlorination of gold in decopperized anode slime in aqueous medium

A study was performed on the chlorination and cementation of gold from an anode slime. The gold from decopperized anode slime first was dissolved with chlorine gas in aqueous medium, later the dissolved gold was precipitated by using a rotational copper disc. The effects of reaction temperature, reaction period, stirring speed, solid-liquid ratio and Cl2 gas flow rate on the dissolution of gold were investigated. Increasing the solid-liquid ratio decreases the dissolution, the solubility increases with increasing reaction temperature, reaction period and stirring speed. It was observed that the Cl2 gas flow rate hasn't a significant effect on the dissolution. As to the precipitation of the gold in the solution, the effects of temperature and rotational speed were sought for. The experimental results showed that the gold recovery could be over 90 %. For the kinetics analysis of the cementation, the activation energy value was found to be 19.51 kJ·mol–1.

Sabri Çolak

Papers

Determination of the Optimum Conditions for Leaching of Malachite Ore in H2SO4 Solutions

Leaching Kinetics of Magnesite in Citric Acid Solutions

Leaching kinetics of sphalerite with pyrite in chlorine saturated water

Optimisation of the chlorination of gold in decopperized anode slime in aqueous medium

A Study on Recovery of Gold from Decopperized Anode Slime