SU579346A1 - Method of obtaining hydroxides of transition elements - Google Patents

Description

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This invention relates to the electroliplastic preparation of transition metal hydroxides, in particular for the preparation of titanium hydroxide.

The known method of electrochemical production of organometallic compounds by electrolysis with alternating current, resulting in an electrode (metal 1, Co1, Hg B1, Sn, Pb, etc.) is oxidized by alternating current into anodic uoiiynepKoa, the formed metal ions are transferred into an organic solvent and thus get the ORGANOMETALLIC compound l.

A disadvantage of the known method is that it is impossible to obtain hydroxide metals of intercepted metals.

There is also known a method for producing transition metal hydroxides by electrolysis; at a constant current when creating a pH gradient in close range.

The disadvantage of this method is the impossibility of obtaining titanium hydroxides with a high yield of gok.

In order to obtain titanium hydroxides with a high current output, the crystalline solution of titanium compounds is subjected to electrolysis on alternating current with a density of 0.5-1.0 A / cm, frequency of 2O-50 Hz at 60-.95 ° C.

According to the proposed method, an alternating current with a density of 0.5-1.0 A / cm is applied to electrodes made of inert material, for example, graphite, with a frequency of 200 Hz, the temperature of the solution is maintained at 60-95 C. This results in the efficient formation of foreign deposits of precipitated hydroxides due to the influence of electromagnetic disturbances in the electrolyte volume.

Example 1. Sulfuric acid solution of titanium (5OO ml), containing 80 g / l and 3.35 g / l of Ti, is subjected to electrolysis in an alternating current with a frequency of 50 Hz at a current density of 7 A / cm (current strength 5 A) within an hour. Voltage on graphite electrodes 8B. The temperature of the solution was 95 ° C. After filtration of the precipitated hydroxides, the titanium content in the solution was 0, ОО84 g / l (99.7% of the guitar was released as hydroxides). From the above example, it follows that the proposed method provides a high yield of titanium hydroxides over current and a high degree of precipitation (by a known method, the titanium content in the solution was 3.35 g / l TJ and no visible formation of hydroxides occurred). In the examples below, the optimality of the selected intervals is proved. Example 2. A guitar sulphate solution containing 75 g / l and 6.52 g / l Ti was subjected to a 50 Hz alternating current treatment with a current density of 0.6 A / cm at graphite electrodes and a voltage of 7 V for 2, 5 hours at different temperatures. JB solution after current treatment revealed the following content of titanium at t28 ° -O.96 g / l; at -fc 41 ° С - 0.498 g / at t 92 С - 0.05 g / l, and the corresponding extraction of titanium into the hydrate product was 85.3, 92.4 and 99.2%, respectively. It is undesirable to maintain the temperature above 95 ° C, since when a solution of titanium is boiling, their destruction occurs and all components present are precipitated. Intervals of other parameters of the electrohydrolysis mode using alternating current are also confirmed by specific results. The current density and the voltage on the electrodes, these two parameters are interrelated, since the magnitude of the current load on the electrodes also increases the value of the applied voltage. The limits indicated in the formula are confirmed by the following example (in the example we are talking about iron, but all conclusions apply to titanium). Example 3. Iron nitric acid diluent pH 2.7 contained 2.4 g / l Fe. The solution was treated with an alternating current with a frequency of 50 Hz at 8O-84 ° C for one hour at various current densities (B). The results of the experiment are shown in table.