SU127024A1 - The method of deposition of commodity hydroxide of cobalt hypochlorite - Google Patents

Description

The cobalt hydroxide is precipitated from j) acTBop03 containing, in addition to cobalt, also nickel, periodically in Pachuca vats (air-agitated agitators) with sodium hypochlorite solution. In order to obtain pure cobalt hydroxide with a content of Ike .1 less than 0.213 / 0, usually two or three consecutive reprecipitations are performed. The third reprecipitation (obtaining commercial cobalt hydroxide) is carried out at 80 °, pH 1.5-2, the final concentration of cobalt in a solution of 4-5 g / l. The process control is based on the periodic sampling of the solution and determining the cobalt content therein directly or by measuring the pH of the solution, and measuring these parameters requires a preliminary extraction of cobalt hydroxide solid from the sample solution. The absence of automated process control does not allow obtaining continuous samples of a clarified and cooled solution with a mipime delay.

The proposed method of automating the process of precipitating cobalt hydroxide is based on precisely adjusting the concentration and measuring the amount of the initial solution. To do this, the initial solution is automatically diluted in an intermediate tank from 60-120 g / l to 30 g / l of cobalt and exactly 8m of solution is poured into the Pachuka vat, with the proper concentration of the solution v the subtitle and: 5 using an analysis filter supplied with a light filter from a layer of nickel salt solution.

In the drawing, a diagram of the automatic control of the cobalt hydroxide precipitation process is shown.

The stock solution from the filter press filter chute / enters the tank 2 for dilution. The dilution is carried out using a photocolorimeter 3, which controls the valve 4, which dispenses water depending on the deviation from the deviation of the cobalt content at the outlet of the container 2;

No. 127024-2 -

A pH meter 5 automatically measures and adjusts the pH. Regulate pH | Lapan & Dosing sulfuric acid. The sensitive organ in this z.ze is a p, one pair (glass - calomel electrodes), an ultrasonic at the outlet of the tank 5- Adjusted in the tank 2 to a concentration of 30 g / l and the pI-1.5 solution enters vat The filling of the latter with a solution is controlled by a level 7 gauge of the bubbling type. When the solution reaches the level (level above the steam valve), a pulse is applied to the opening of the steam in the tank and the heating of the solution begins. The device for measuring temperature control is the electronic bridge 8 of the EMD-217 system, which controls the steam clan 9 operating system. The sensitive body of the automatic temperature-maintaining unit is a copper resistance thermometer installed in the tank. When the solution reaches a level corresponding to 8.g, the level gauge 7 gives an impulse to allow the dosing of GNP and the relay unit / (9, transmitting the impulses to close the valve I, which stops the solution in the vat, and to open the Klaichan 12 for filling it with the next vat. Dosing of hydrochloride is carried out with the help of a time sensor 13 controlling a shut-off valve 14 located on the hypochlorite annular pipe, the pressure in which is kept constant. The time sensor is triggered only when there is 8 g of solution and 80 °. In this case, a certain portion of hypochlorite is dosed, necessary for precipitating cobalt hydroxide to a predetermined depth. After the dosing from the time sensor is completed, an impulse is transmitted to the time delay relay 15, which controls the magnetic actuator 16 of the pump electric motor 17. 6 minutes is necessary for unscrewing the solution - bringing the reaction to an end. The magnetic starter, if activated, releases the relay unit 10, excluding the opening of the valve 11 during the pump operation. The precipitated cobalt hydroxide slurry is transported by a pump for filtration. During filtration, the temperature in the tank is kept constant at 80 °. When the minimum level is reached, steam access to the tank is stopped.

After the tank is emptied, the motor is automatically switched off by the current relay.

Subject invention

The method of sedimentation of commercial cobalt hydroxide with hypochlorite, characterized in that, in order to stabilize the precipitation conditions, the solution is diluted beforehand to a predetermined concentration in the intermediate tank, and the proper concentration of cobalt ions in the solution is maintained with an analyzer equipped with a light filter from the nickel salt solution.