CS207802B1 - Method of making the nickel chloride solution - Google Patents

Description

(54) A method for producing a nickel chloride solution

The invention relates to a process for producing a nickel chloride solution by dissolving above 1000 ° C of highly annealed nickel oxide in hydrochloric acid. This nickel oxide is obtained by the rapid annealing of carbonate or nickel sulphide. At annealing above 1000 ° C, nickel oxide of specific gravity greater than 6.6 g.cm ³ with a sulfur content of less than 0.03% is obtained, which is used as starting material for the production of metallurgical granulated nickel.

To date, methods for producing nickel chloride by direct dissolution above 1000 ° C of high annealed nickel oxide in hydrochloric acid are not known. The nickel chloride solution is therefore obtained by dissolving nickel carbonate, metallurgical nickel or even by dissolving nickel oxide obtained by annealing at a temperature substantially lower than 1000 ° C.

So far, it has been found that when the annealing temperature of nickel oxide is 1000 ° C and above, the specific gravity of the oxide exceeds 6.31 g.cm ³ · ³ , with nickel oxide changing the particle size and moving from an amorphous state to a crystalline state. In this state, nickel oxide is chemically inactive, dissolving slightly and with difficulty in acids.

The disadvantage of the processes used to prepare the nickel chloride solution used so far is the use of substantially more expensive raw materials, namely nickel carbonate, metallurgical nickel, or nickel metal. nickel oxide obtained by annealing at a temperature substantially lower than 1000 ° C. Nickel oxide, obtained by annealing at a temperature of 1000 ° C and above, must be treated in one or more batches

207 602

207,802 operations prior to nickel chloride solution preparation

The above-mentioned disadvantages do not have the process for producing the nickel chloride solution according to the invention, which consists in that at a temperature above 1000 ° C the highly annealed nickel oxide is dissolved in hydrochloric acid at a concentration of 100 to 300 grams of hydrochloric acid per liter of solution at 90 ⁰ to 105 ° C in the presence of metallic iron and / or aluminum and / or metallic nickel in an amount of 1 to 50 grams per liter of solution

In the absence of said metal in the dissolution solution, the nickel oxide is highly annealed at a temperature greater than 1000 ° C under the same conditions in the hydrochloric acid. they are difficult to dissolve and difficult to prepare for nickel chloride solution. From the point of view of further processing, it is best to carry out the dissolution in the presence of nickel metal, as this will reduce the cost of cleaning the solution.

He did

In a dissolution tank, the high annealed unground nickel oxide, presented in a 50% stoichiometric excess, is treated at 100 ° C with 1000 liters of hydrochloric acid solution containing 190 g of hydrochloric acid per liter of solution. At this temperature, 10 kg of metallurgical granulated nickel is added to the solution. Dissolution is very violent and within two hours is complete. The solution obtained contained 186 g of nickel, 4 g of hydrochloric acid per liter of solution. The nickel chloride solution is further processed to crystalline nickel chloride by known methods. ·.

Example 2

If the ground, highly annealed nickel oxide is dissolved in hydrochloric acid, the solution is very foaming and the hydrochloric acid needs to be gradually added.

500 liters of 190 grams of hydrochloric acid per liter of solution are introduced into the dissolution tank. To this acid was added 200 liters of a ground, highly annealed nickel oxide slurry with a 1% metallic nickel content in a 20% stoichiometric excess to the total amount of hydrochloric acid added, i.e. 1000 liters with a concentration of 190 grams of hydrochloric acid per liter of solution. The solution is heated to 95 ° C with stirring. After half an hour, the concentration of hydrochloric acid drops from the original 135.7 grams to 90 grams of hydrochloric acid per liter of solution, and 110 liters of 310 grams per liter of solution are added to the dissolution tank. The solution was heated again to 95 ° C with stirring. Within a further half-hour of dissolution the solution stops foaming, the hydrochloric acid concentration in the solution is reduced from the original 120 g to 75 g hydrochloric acid in one liter of solution and an additional 20 liters of 310 g hydrochloric acid per liter are added. The final concentration of hydrochloric acid in the solution is 121.5 g per liter. solution. The solution is heated to 95 ° C with stirring. Dissolution proceeds very violently, within two hours is completed. The nickel chloride solution obtained, which is concentrated during dissolution, contains 192 g of nickel and one gram of free

207 802 hydrochloric acid in one liter of solution.

Claims (1)

SUBJECT TO LEAVE FROM Process for producing a nickel chloride solution, characterized in that, at a temperature above 1000 ° C, highly annealed nickel oxide is dissolved in hydrochloric acid at a concentration of 100 to 300 grams of hydrochloric acid per liter of solution at a temperature of 90 to 105 ° C in the presence of metallic iron; (a) aluminum and / or nickel metal in an amount of one to fifty grams of metal per liter of hydrochloric acid of said concentration.