Method for extracting chromium from chromium-containing waste liquor
A technology of waste liquid and ferrochrome, which is applied in the field of comprehensive utilization of sewage resources, can solve the problems of high cost and low efficiency, and achieve the effects of convenient operation, cost reduction, and efficient separation and recovery
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[0036] Example 1
[0037] Treatment of Cr by this process 3+ The chromium-containing waste liquid with a mass concentration of 1.66g / L, the used laterite-nickel ore leaching solution contains 20.24g / L of iron.
[0038] Preparation of magnetic fluid: Pulverize magnetite powder with a purity of more than 90% to below 38 microns, sieve through a 400-mesh standard Taylor sieve, and use the sieved product as a magnetic crystal nucleus. The ore (containing more than 55wt% iron) is mixed in a mass ratio of 5:1, and ground in a ceramic ball mill for 30min, so that the hematite is coated on the surface of the magnetic crystal nucleus, and the magnetic material and water are in a mass ratio of 1:2. Proportional mixing, namely magnetic fluid.
[0039] Add 5g / L magnetic fluid to the reaction kettle containing 0.5L distilled water and stir, add an appropriate amount of dilute H 2 SO 4solution so that the pH of the solution is around 3. Mix the laterite nickel ore sulfuric acid leachin...
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[0042] Example 2
[0043] Treatment of Cr by this process 3+ Chromium-containing waste liquid with mass concentration of 5.28g / L, laterite nickel ore leaching solution Fe 3+ The mass concentration is 20.24g / L.
[0044] Preparation of magnetic fluid: Pulverize magnetite powder with a purity of more than 90% to below 38 microns, sieve through a 400-mesh standard Taylor sieve, and use the sieved product as a magnetic crystal nucleus. The ore (containing more than 55wt% iron) is mixed in a mass ratio of 5:1, and ground in a ceramic ball mill for 35min, so that the hematite is coated on the surface of the magnetic crystal nucleus, and the magnetic material and water are in a mass ratio of 1:3. Proportional mixing, namely magnetic fluid.
[0045] Add 8g / L magnetic fluid to the reaction kettle containing 0.5L distilled water and stir, add an appropriate amount of dilute H 2 SO 4 solution so that the pH of the solution is around 3. The laterite nickel ore leaching solution and t...
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[0049] Example 3
[0050] Treatment of Cr by this process 3+ Chromium-containing waste liquid with mass concentration of 10.64g / L, laterite nickel ore leaching solution Fe 3+ The mass concentration is 20.24g / L.
[0051] Preparation of magnetic fluid: Pulverize magnetite powder with a purity of more than 90% to below 38 microns, sieve through a 400-mesh standard Taylor sieve, and use the sieved product as a magnetic crystal nucleus. The ore (containing more than 55% iron) is mixed in a mass ratio of 4:1, and ground in a ceramic ball mill for 40 minutes, so that the hematite is coated on the surface of the magnetic crystal nucleus, and the magnetic material and water are in a mass ratio of 1:2.5. Proportional mixing, namely magnetic fluid.
[0052] Add 10g / L magnetic fluid to the reaction kettle containing 0.5L distilled water and stir, add an appropriate amount of dilute H 2 SO 4 solution so that the pH of the solution is around 2.7. The laterite nickel ore leaching solut...
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