الفهرس 
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Abstract
tassium. snlts are essential as plo.nt nutrients nnd e required in large quantities • Also they are used in vernl other co.m.m.erioal demo.nds ~ Mnnufncture of salt sea-water is ~olusi vely done by solnr evaporntion ter the salt separation betvreen 24~ mid 28°Be • , the of 28°Be left over is onlled bitterns G Se~ water contain a rational content of potassium ion , and suoh it is a good source of potassium ~
Further evnpo»ntion of bitterns increases the concen- G$l’ntion of both magnesium. and potassium ions Dnd facilit-
yates th~ separation of both as mixed snlt ~ Co.rnallite onn be obtained from this mixed salt by [leaohing with magnesium ohloride solution and cooling ! The thesis is divided into three main parts ~ theore:” tionl po.rt t experi.m.ento.l part and dissoussion of the resu-
,its obtained • he theoretical part is divided into three chapters. ~e first 11s witih potr10h and potassium fertilizors This chapter explains mainly the methods of crystnlliza tion of potash either as car.nnllite or as mixed salt • The second chapter is a complete review on the methods of crystallization and separation of potash , beginning with u review on the crystallization of potcsh as cnrnallite followed by another review on the cXJ~tallizntion separ¬ation of mixed salt ~ The methods of separation of the cons¬tituents of mixed salt are’also reviewed ill this chapter The third chapter includes n description of some physi¬cal properties of potassium chloride , magnesium sulphate t magnesium chloride and their minerals • The experin:tOntal pnrt begins with the nnalysis of the raw materials used in this work i.e sen water bitterns • This is followed by obtai:ni:n.g mixed salt b either solar or hot plnte evaporation , determ:the optimum conditions of orystallization of this mixed salt • Three methods are chosen for separation of mixed salt oonstitruents • The first method includes leaching of the mixed