JPS61130433A - Treatment of sulfide containing ni and/or co and cu - Google Patents

Abstract

PURPOSE:To exude Ni, Co efficiently and selectively, by kneading sulfide contg. Ni and Co, Cu with concn. H2SO4, roasting them, next, applying water exudation thereto. CONSTITUTION:Co, Cu-contg. sulfide being intermediate product obtd. in Ni, Co smelting, is kneaded with concn. H2SO4, then these are roasted. Next, water exudation is carried out. In this case if roasting temp. is raised, exudation ratios of Ni and Co are raised, causing differences of said ratios with that of Cu. If H2SO4 is decreased to somewhat less than equivalent, Ni and Co can be exuded preferentially than Cu. By this method, Ni, Co, Cu are exuded simultaneously or selectively from sulfide.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for leaching Ni and/or Co and Cm from a sulfide containing Ni and/or Co and Cu, particularly by sulfating roasting. The present invention relates to a method for simultaneously leaching Ni and/or Co and Cu through a continuous water leaching process, and a method for selectively extracting Nl and/or CO and Cu.

Background of the Invention 'In the smelting of nickel and cobalt, various processes have been developed depending on the raw materials, but precipitates containing Ni, (@ and Cm) are generated as intermediate products of these processes. For example, a process in which Nl and Co are finally separated and recovered by a solvent extraction method using a mixed sulfide called mixed sulfide, which is mainly composed of Nl and Co and also contains Cu5F@, Zn, etc., as a starting material. has been established.

Mixed sulfide undergoes the steps of leaching, iron removal, copper removal, and zinc removal, and is finally separated and recovered into Ni and Co in the extraction process. Copper, which is an impurity in the copper removal process, is N
i. A sulfiding agent such as sodium hydrogen sulfide is added to the C@-containing solution and removed as sulfide, but at this time, a portion of Nl5Co is also precipitated together with copper as sulfide. - By example, such deposits are Cts=20-25% and Ni+Co=
It has a composition of 15-20%. Therefore, a method for recovering Ni and/or Co and Cu from such precipitates, preferably Nl and/or C.

It is desired to establish a method for selective recovery of C11 from C11.0 Prior Art Currently, as a treatment method for such sulfide precipitates containing Ni and/or Co and C11 (HNOs + Hx SO
a) Ni and /l or C (
I and C1! However, there is a cost problem and there is a risk of deterioration of the solvent, so a leaching method that does not use glassware is desired. Furthermore, it is desired to establish a technology for separating and recovering CX and 1'lTl and/or Co.

A high rate of Ni%CI%Cu can be leached by high-temperature leaching using concentrated sulfur fusion, and Cu and N can be leached by selecting temperature conditions.
Although it is possible to separate Ni and/or Co, it is extremely difficult to put it to practical use industrially because the f-permeability is very poor.

It has been found that efficient leaching of Ni and/or Co is possible by kneading sulfides containing Cts and Cts with concentrated sulfurization, roasting, and then leaching with water. As the roasting temperature becomes higher, the leaching rate of Ni and/or Co increases rapidly, and there is a considerable difference from the leaching rate of Cu. ! '' or selective leaching of Co and Cu is possible.

Up to around 150℃, 5MB + 4H wealth 80a = 3 N804 + 48
+4N2O reaction occurs, and from around 150°C, 80° generation mainly occurs, as shown in the following equation.

N8 + 2 Hz Soa = xs o, + 8
+ S (h + 2 Hz) By adding O sulfur WIm in an amount slightly less than the equivalent number, the difference in leaching rate between Ni and/or Co and Cu becomes even larger.

Thus, in the present invention, sulfide containing Ni and/or Co and C1 is kneaded with sulfuric acid, roasted at a temperature of 150°C or higher, and then leached with water to produce Ni and/or Co.
Alternatively, there is provided a method for treating sulfides containing Ni and/or CO and Cu, which is characterized by obtaining a leachate containing Co and Ctt.

Furthermore, a method is provided for preferential leaching over Ni and/or Cotr:Cu by adding a sub-equivalent amount of sulfur ζ.

EXAMPLE The present invention will be explained based on an experimental example using a precipitate obtained from the dehooking process of the mixed sulfide smelting process.

This is Cts=20~25% and Ni+Co=15~
It contains 20%.

Actual number: Followed the following 70-sheet: Raw materials The equivalent amount of sulfuric acid addition t was calculated using the following formula.

This is the number of equivalents for Co and Cu.

5MS+4HIS04=5M804+48+4HsO The experimental results are shown in FIGS. 1 and 2. 11th! i! ! 1 is the case where the amount of sulfuric acid added is 17 equivalents, and FIG. 2 is the case where the amount of sulfuric acid added is 12 equivalents. The leaching rate of Ni and Co increases as the temperature rises, and rapidly increases from around 130°C.

At 150℃ it is about 50% and at 200℃ it is about 90%.
The leaching rate is as high as %. The leaching rate of CII is Ni, C
It is low compared to O, and is less than 10% up to 200°C when 7 equivalents of -acid α is added, and 1 when 12 equivalents of sulfuric acid is added.
It is less than 10% up to 50°C and about 40 hiss at 200°C.

80, the concentration is 0L05~1 at 150℃ according to the detector tube
The detected amount is about 2%, but at temperatures above 200°C, it exceeds the upper limit and becomes several tens of percent or more. That is, 80. The reaction is as shown in the following equation where generation occurs proactively.

M S + 2 Hz S Oa = M S 04 +
S + SO snow + 2 ■ snow 0 Therefore, in the case of S02 generation ash reaction, the amount of Hl 80a s addition is required to be 15 times the initial amount. By increasing the amount of H and SO4, the leaching rate of C1l increases by 42.

In this way, by increasing the amount of H, S 04 added,
It is possible to achieve a high leaching rate of Ni and/or CO and C1I, and on the other hand, selective leaching of Nl and/or Co and Ctt can be achieved by making the amount of H, SO, and added slightly insufficient. can do.

Reference Example As briefly mentioned at the beginning, high-temperature leaching with concentrated sulfuric acid enables high-rate leaching. An experimental example is shown for reference. The same Cu5Ns, Co precipitate as in the example was prepared using concentrated sulfuric acid at a slurry concentration of 1001/l and at a temperature of 80-1
Leaching was carried out at 40°C for 5 hours. A mixed gas of N, α417 min/min, and CL 1 t/min was injected during the treatment. After leaching, the mixture was cooled to 50 to 60°C to crystallize Cm, Ni, and CO as sulfates.

The resulting data were summarized: Leaching rate (%) 80°C 55-40 90 120°C 85 97 140°C 99 99 From this, it can be seen that in the treatment at 140°C by this method, Nl5C
It can be seen that a 99% leaching rate of o and Cu was obtained. On the other hand, at 80°C, the 011 leaching rate is much higher than the Ni and Co leaching rates. Using this phenomenon, Ni1Cos C1!
It is thought that simultaneous high-rate leaching and selective leaching can be carried out, but it has been found that the permeability is poor and is not suitable for practical use.

Claims (1)

[Claims] 1) Adding sulfuric acid to a sulfide containing Ni and/or Co and Cu, kneading the mixture, roasting at a temperature of 150°C or higher, and then leaching with water to produce Ni and/or Co and Cu
A method for treating sulfides containing Ni and/or Co and Cu, the method comprising obtaining a leachate containing Ni and/or Co and Cu. 2) Sulfuric acid is added slightly less than the equivalent amount, thereby reducing N
The method according to claim 1, wherein i and/or Co are leached out preferentially over Cu.