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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

Active Publication Date: 2014-11-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] In view of the deficiencies in the various methods for treating chromium-containing wastewater in the prior art, mainly reflected in defects such as high cost and low efficiency, the purpose of the present invention is to provide a method that can quickly, efficiently, and cost-effectively remove chromium-containing waste water from chromium-containing waste water. A method for selectively extracting chromium to prepare chromium-rich iron slag, the method is simple in process, convenient in operation, and meets industrial production

Method used

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  • Method for extracting chromium from chromium-containing waste liquor
  • Method for extracting chromium from chromium-containing waste liquor
  • Method for extracting chromium from chromium-containing waste liquor

Examples

Experimental program
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Effect test

Embodiment 1

[0037] Using this process to process Cr 3+ The chromium-containing waste liquid with a mass concentration of 1.66g / L, the laterite nickel ore leachate used contains 20.24g / L of iron.

[0038] Preparation of magnetic fluid: crush the magnetite powder with a purity of more than 90% to less than 38 microns, and sieve it through a 400-mesh standard Taylor sieve. The ore (containing more than 55wt% iron) is mixed at a mass ratio of 5:1, and ground for 30 minutes in a ceramic ball mill, so that the hematite is coated on the surface of the magnetic crystal nucleus, and the magnetic material and water are mixed at a mass ratio of 1:2. Proportionally mixed to obtain the magnetic fluid.

[0039] Add 5g / L magnetic fluid into a 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 leaching solution with the chromium-containing waste solution at...

Embodiment 2

[0043] Using this process to process Cr 3+ Chromium-containing waste liquid with a 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: crush the magnetite powder with a purity of more than 90% to less than 38 microns, and sieve it through a 400-mesh standard Taylor sieve. The ore (containing more than 55wt% iron) is mixed at a mass ratio of 5:1, and ground for 35 minutes in a ceramic ball mill, so that the hematite is coated on the surface of the magnetic crystal nucleus, and the magnetic material and water are mixed at a mass ratio of 1:3. Proportionally mixed to obtain the magnetic fluid.

[0045] Add 8g / L magnetic fluid into the reaction kettle containing 0.5L distilled water and stir, add appropriate amount of dilute H 2 SO 4 solution so that the pH of the solution is around 3. Mix lateritic nickel ore leaching liquid with chromium-containing waste liquid in a ratio of 1...

Embodiment 3

[0050] Using this process to process Cr 3+ Chromium-containing waste liquid with a 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: crush the magnetite powder with a purity of more than 90% to less than 38 microns, and sieve it through a 400-mesh standard Taylor sieve. The ore (containing more than 55% iron) is mixed at 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 mixed at a mass ratio of 1:2.5 Proportionally mixed to obtain the magnetic fluid.

[0052] Add 10g / L magnetic fluid into a 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. Mix the laterite-nickel ore leaching solution with the chromium-containing waste solution ...

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Abstract

The invention discloses a method for extracting chromium from chromium-containing waste liquor. According to the method, magnetite powder is taken as a magnetic crystal nucleus, a compound which mainly comprises chromium and iron is generated by reacting chromium-containing waste water with laterite-nickel ore acid leach liquor, and the compound is wrapped on the surface of the magnetic crystal nucleus through adsorption and then separated by utilizing the magnetism of the magnetic crystal nucleus. The method disclosed by the invention can be used for preparing chromium-rich iron slag by fast, efficiently and selectively extracting the chromium from the chromium-containing waste liquor by adopting low cost and sufficiently recovering the iron resources contained in the laterite-nickel ore acid leach liquor, is simple in process and convenient to operate and meets the requirement for industrialized production.

Description

technical field [0001] The invention relates to a method for extracting chromium from chromium-containing waste liquid, and belongs to the technical field of comprehensive utilization of sewage resources. Background technique [0002] In the process of material surface treatment, chromium electroplating, metal passivation, coloring and cleaning will all produce chromium-containing wastewater. If it is directly discharged, it will not only waste resources, but also pollute the environment and seriously endanger human health. The national wastewater discharge standard stipulates that the maximum allowable concentration of residual Cr(VI) in wastewater is 0.5mg / L, and the total chromium is 1.2mg / L. Therefore, it is very necessary to treat electrochrome plating wastewater. At present, the treatment of chromium-containing wastewater at home and abroad mainly adopts chemical reduction method, electrochemical method, ion exchange method, and activated carbon adsorption method. In a...

Claims

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Application Information

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IPC IPC(8): C02F1/48C02F1/52C22B7/00C22B34/32C02F101/22
CPCY02P10/20
Inventor 孙伟韩海生唐鸿鹄刘文莉吕德良岳彤
Owner CENT SOUTH UNIV
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