Method for Extracting Cobalt from Nickel Pyrometallurgy Process
A pyrotechnic and nickel matte technology, which is applied in the field of cobalt extraction in the process of pyrometallurgical nickel smelting, can solve the problems of low industrial operability and low cobalt recovery rate
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Embodiment 1
[0041] Taking 100t of raw materials containing 7% nickel and 0.24% cobalt as an example: after matte smelting, 27.16t of low-nickel matte was produced, which contained 25% nickel and 0.62% cobalt, and the melting recovery rate was 97%. The matte enters the converter for blowing.
[0042] The high-nickel matte produced in the blowing process is used as an intermediate product. The high-nickel matte is 14.94t, containing 45% nickel and 0.8% cobalt. The recovery rate of cobalt in the high-nickel matte is 49.8%. The previous blowing slag with an iron content of more than 10% was returned to smelting, and the previous slag contained 0.4% nickel and 0.3% cobalt. The later blowing slag with iron content between 10 and 3% is discharged into the rotary kiln as cobalt-rich sieve slag. The sieve slag is about 6.27t, containing 1% nickel and 0.65% cobalt.
[0043] The cobalt-rich sieve slag enters the rotary kiln for reduction roasting. The reduction roasting temperature is 1150° C., the...
Embodiment 2
[0046] Taking 100t of raw materials containing 9% nickel and 0.3% cobalt as an example: after matte-making and smelting, 35.1t of low-nickel matte was produced, which contained 25% nickel and 0.68% cobalt, and the melting recovery rate was 97.5%. The matte enters the converter for blowing.
[0047] The high-nickel matte produced in the blowing process is used as an intermediate product. The high-nickel matte is 19.31t, containing 45% nickel and 0.8% cobalt. The recovery rate of cobalt in the high-nickel matte is 51.5%. The previous blowing slag with an iron content of more than 10% was returned to smelting, and the early slag contained 0.4% nickel and 0.32% cobalt. The post blowing slag with an iron content of 10-3% is discharged into the rotary kiln as cobalt-rich sieve slag. The sieve slag is about 8.11t, containing 1% nickel and 0.85% cobalt.
[0048] The cobalt-rich sieve slag enters the rotary kiln for reduction roasting. The reduction roasting temperature is 1170° C., t...
Embodiment 3
[0050] Taking 100t of raw materials containing 8% nickel and 0.29% cobalt as an example: after matte-making and smelting, 31.14t of low-nickel matte was produced, which contained 25% nickel and 0.63% cobalt, and the melting recovery rate was 97.3%. The matte enters the converter for blowing.
[0051] The high-nickel matte produced in the blowing process is used as an intermediate product. The high-nickel matte is 17.12t, containing 45% nickel and 0.8% cobalt. The recovery rate of cobalt in the high-nickel matte is 50.7%. The previous blowing slag with an iron content of more than 10% was returned to smelting, and the previous slag contained 0.4% nickel and 0.31% cobalt. The post blowing slag with an iron content between 10% and 3% is discharged into the rotary kiln as cobalt-rich sieve slag. The sieve slag is about 7.19t, containing 1% nickel and 0.75% cobalt.
[0052] The cobalt-rich sieve slag enters the rotary kiln for reduction roasting. The reduction roasting temperature...
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