ITPA940003A1 - USE OF CLAY AS AN ION EXCHANGE RESIN (THE TERM CLAY INDICATE THE GRANULOMERIC COMPONENT OF THE SOIL WITH DIAMETER - Google Patents

Abstract

The ion exchange capacity of clay minerals has long been known; the type and relative abundance of interchangeable ions are extremely important characteristics of clay minerals. However, the use of the granulometric component of the soil with a diameter of less than 0.002 mm (clay), as an ion exchange resin and the methods of its specific activation have never been treated, although it has undoubted economic advantages. This patent application intends to claim priority in the use of this granulometric component of the soil as an ion exchange resin. In particular, in the present application, it concerns its use, after activation with ammonium hydroxide, in the removal of sulphates in the extractive industry of magnesium from sea water.

Description

DESCRIPTION OF THE INDUSTRIAL PATENT title

PROCEDURE FOR EXTRACTION OF MAGNESIUM AND OTHER WATER CATIONS OF

SEA OR OTHER SOLUTIONS USING ACTIVATED CLAY

TEXT OF THE DESCRIPTION

It was thought that the granulometric composition of the soil having a diameter of less than 0.002 mm commonly referred to as clay, if appropriately; activated, could have good ion exchange capabilities and therefore have useful practical applications, with low operating costs, in numerous industrial processes in which specific absorption or ion exchange is required. To verify this hypothesis we used-! to a soil having the following particle size composition:

One thousand grams of this soil, roughly sieved to eliminate the inert material, were placed on two sieves with meshes of less than 0.5 mm, 'sow ropponibill, having the following dimensions: height of each sieve 10 Cm; internal diameter 25 Cm; height of the soil layer in each sieve 2 Cm; total height of the column 20 Cm.

1000 ml of an approximately 7 solution of ammonium hydroxide were percolated into the column and subsequently 1200 ml of a seawater solution enriched with both magnesium and sulphates with Kainite and having the following composition: magnesium 2.25 mg / ml and sulphates 10.2 gr / lt. The cycle of passage of the solution in the column was repeated three times.

The solution collected, after the last step, had the following composition:

magnesium 0,42 mg / ml and sulphates 9, 50 gr / lt.

The magnesium retained in the column was recovered by percolating about 1000ml of a normal HCl solution. The solution collected had the following composition:

magnesium l, 8l mg / ml and sulphates 0.46 gr / l.

The system therefore perfectly responds to the needs of the magnesium extraction industry from sea water in which the sulphates together with the borates, presumably similarly eliminated, represent a considerable drawback.

The subject of the present patent is the use of the granulometric fraction of the soil with dimensions lower than 0.002 mm - however activated - both in the ion exchange and in the specific absorption. In particular, with the present, it is intended to patent its use in the specific adsorbing of magnesium in industry extracting this element from sea water and its use in the specific absorption of magnesium in the processing waste. extractive industry of potassium iw er of alkaline salts.

Claims (2)

CLAIMS 1) Use of the particle size fraction of the soil with a diameter of less than 0.002 mm, however activated, both in ion exchange and in specific absorption. 2) Use of the granulometric fraction of the soil with a diameter of less than 0.002 mm activated with amine hydroxide in the absorption of magnesium and in the subsequent recovery.