SU833276A1 - Method of ion-exchange between solution and granular ionite - Google Patents

Description

(54) METHOD OF ION EXCHANGE BETWEEN SOLUTION AND GRANULAR IONITE

I

The invention relates to a technique for carrying out ion-exchange processes under conditions of countercurrent contacting of the processes in the vertical column of the solution and granular ion exchanger and can be used in chemical-technological and hydrometallurgical sectors of the industry, as well as in industrial water treatment processes with water softening using ion-exchange methods.

There is a known method of countercurrent ion exchange between a solution and a granular IONITE, which is carried out by moving the solid phase layer from the bottom up, and the liquid phase from top to bottom l.

However, with this method, the loading of the solid phase has to be carried out in the lower part of the column, i.e. under the apparatus there is a layer of this phase, and its discharge is through the upper edge of the apparatus. This method of loading and unloading solids necessitates the application of pulsating pressure pulses both to the upper end of the loading tube and under the drainage in the lower part of the column, which, in addition to complicating the design and maintenance of the apparatus, increases the likelihood of longitudinal mixing of the solids grains and, , reducing the degree of countercurrent contacting phases.

0

A known method of ion exchange between a solution and a granular ion exchanger, including the movement in the vertical column of the granular ion exchanger from top to bottom, the introduction of the ion exchanger into the upper part

5 columns, output - in the lower part, countercurrent movement of the solution and its output in the upper part of the column through the drainage device 2 1.

Claims (2)

In this method, the loading and unloading of the solid phase, as well as the supply and removal of the liquid phase is carried out simultaneously, i.e. the device operates in continuous mode. The disadvantage of the method is that under industrial conditions, due to the presence of fine particles of ion exchanger and foreign bodies in the treated ionites, the drainage grid of the upper drainage device of the column is often clogged. The cause of clogging is the position of the D15-scaling device over the layer of the ionite being processed, as a result of which, due to the absence of a dense protective layer of larger grains of ion exchanger directly adjacent to the filtering surface, they were suspended from the ion exchanger and carried away upwards flow / solution, reach the drainage grid and gradually clog its holes. This implies the limited application of the method. It is suitable only for the absence of suspensions of small particles in the treated solid phase. The purpose of the invention is to increase the efficiency of the process and ensure self-cleaning of the drainage device. This goal is achieved by the fact that the drainage device is placed in the ion exchanger layer, and the input, output and transfer operations of the solution and ion exchanger are performed in a discontinuous-cyclic mode by cyclically alternating the input and output of the solution and input of the ion exchanger with the output of the ion exchanger. The presence of the upper drainage device in the layer of the treated solid phase creates the condition for the formation of a compacted layer of this phase, directly adjacent to the filtering surface of the drainage grid, resulting in suspension of fine particles contained in the solid phase and capable of clogging the drainage grid, delayed by the specified solid layer of protective and no income t to the drainage grid. However, in this case, the solid phase layer, which protects against drainage grid clogging, becomes clogged by itself. But, due to the operation of the apparatus in a discontinuous-cyclic mode, there is a sharp periodic displacement from top to bottom of the entire layer of the solid phase in the dehydrated state, which leads to the renewal of the protective layer of the solid phase and, consequently, to periodic regular self-cleaning of the drainage. Example I. The proposed method was tested for several months 6 cent in the process of sorption of a valuable component from solutions on an ion exchanger with a fine suspension content of 10%. However, no clogging of the upper drainage device of the column was observed. Example 2. The proposed method was also tested in the process of desorption of the valuable component from an ion exchanger saturated with this component during the previous process of contacting it with ore pulp. The content of fine suspension in the ionite was 15% svippe. At the same time, within 4 months the clogging of the drainage device was also not observed. At the same time, studies of the same processes were carried out, with the same content of fine suspension in the solid phases under the conditions of a known method. At the same time, the drainage device of the column was clogged within 20-30 minutes, as a result of which the apparatus lost its operability. Thus, the use of the pre-proposed method in the national economy can prevent clogging of the upper drainage device, increase the reliability and durability of the apparatus in industrial conditions, simplify and facilitate the maintenance of the apparatus, reduce the volumes of solutions being wrapped, i.e. ultimately, to increase the efficiency of the ion-exchange process being carried out. The less efficient apparatus of similar purpose existing in industry is easily reconstructed for work according to the proposed method: o6y. The invention The method of ion exchange between a solution and a granular ion exchanger, including moving the vertical granulate ion exchanger layer in a vertical column, against the "swollen movement of the solution and its output through the drainage device, about what it is to increase process efficiency and self-cleaning of the drainage device, the drainage device is placed in the ion exchanger layer, and the input, output and displacement of the solution and ion exchanger are performed in a discontinuous cyclical mode by cyclic 5833276 and alternation of the input and output of the solution and I. USSR author's certificate of input of ion exchanger with output of ion exchanger. 9 270.696, cl. At 01 J 1/04, 1970. Sources of information, 2, the NDP Patent No. 61507, taken into account in the examination of cl. In 01 T / 06, 1967.