Tinkal atýklarýnýn SO2 ile doyurulmuþ çözeltilerde süzülebilirliði

Bor cevherleri çeþitli bor bileþiklerinin üretiminde kullanýlýr. Tinkalden elde edilen boraks onlarýn en önemlilerinden biridir. Rafine boraks üretiminin en önemli sorunlarýndan biri sulu çözeltide kolloidal olan ve süzülmeyen killi minerallerin tinkalden ayrýlmasýdýr. Bu amaçla çeþitli çöktürücü maddeler kullanýlýr ve bu da maliyeti artýrýr. Diðer taraftan bu iþlem sýrasýnda önemli miktarda boraks kaybý olur. Bunun için, daha önceki çalýþmalarda CO2 gazý kullanýlmýþ, yeterli kuagülasyon saðlanamamýþtýr. Filtration zamaný uzun sürmüþtür. Bu çalýþmada kolloidal halin bozulmasý için SO2 gazý kullanýlmýþtýr. Çalýþmalarda sýcaklýk ve karýþtýrma süresi parametre olarak seçilmiþtir. Örnek çok küçük parçalara ayrýldýðý için partikül boyutu parametre olarak seçilmemiþtir. Böylece kolloidal halin kaybolabileceði, çeþitli bor minerallerinin çözülebileceði ve sývý ortamda bor kayýplarýnýn minimum olabileceði sonucuna varýlmýþtýr. Bu metot kullanýlarak herhangi bir çökeltmeyi hýzlandýrýcý madde kullanmadan minimum bor kaybýyla daha hýzlý filtrasyon elde edilebileceði gözlendi. Sonuçta, 60 dk.’lýk karýþtýrma süresinde 50 ºC’de B2O3 içeriðinin %99.5’inin kazanýldýðý ve CaO’in yaklaþýk %84’ünün ana çözeltiye geçtiði bulunmuþtur.

Filtrations of tincal wastes in SO2 saturated solutions

Boron ores are used in the production of various boron compounds. One of the most important of them is borax obtained from tincal. One of the most important problems in refined borax production is to separate tincal from the clay minerals which is in colloidal state in aqueous solution and cannot be filtered. For this reason, a lot of coagulants are used and this causes some increase in the cost. On the other hand, there is considerably losing of borax during these processes. For this purpose, CO2 has been used in previous studies, But sufficiently coagulation has not been provided. Filtration time has been for a long time. In this study, in order to disappear the colloidal state, SO2 has been used instead of a coagulant. The temperature and stirring time have been chosen as parameters in this work. Since the sample was having to broken into small pieces structure, particle size was not investigated as a parameter. Thus, it has been resulted that the colloidal state may disappear and various boron minerals may be dissolved, and in water aqueous media boron loses become minimum. Also, by using this method, it has been examined that without becoming necessary to use a coagulant it can be obtained a more rapid filtration with minimum boron lose. As a result, in a 60-min experiment at 50 ºC, 99. 5% of B2O3 contents waste was recovered. In addition, about 84% CaO in the waste was dissolved in the leaching solution.