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Method for preparing basic chromium sulfate from chromium-contained wastewater

A technology for chromium sulfate and chromium wastewater, applied in the direction of chromium sulfate and the like, can solve the problems of complex treatment process, inability to reuse resources, and high treatment costs, and achieve the effects of simple process, less impurities and high bioavailability.

Active Publication Date: 2019-03-01
XINGJIA BIO ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the commonly used treatment method of chromium-containing wastewater is the chemical reduction precipitation method, and the Cr 6+ reduced to Cr 3+ , and then generate chromium hydroxide precipitates under alkaline conditions to remove chromium ions. The generated chromium hydroxide precipitates cannot be reused as resources due to high impurity content and complex components. In addition, such methods generally have a large amount of reagents, which can Disadvantages of higher consumption, more complex processing process, and higher processing costs

Method used

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Examples

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Effect test

Embodiment 1

[0045] A method for preparing basic chromium sulfate with chromium-containing waste water of the present invention comprises the steps:

[0046] (1) Continuously add hydrogen peroxide with a mass concentration of 30% in 10L of chromium-containing wastewater until the cyanide detection test paper is detected as 0, and the color of hydrogen peroxide solution does not change after sampling, and the reaction is carried out at 70°C for 6 hours; The chromium content in the chromium wastewater is 514mg / L in terms of chromium, and the chromium-containing wastewater also includes Fe 3+ , Zn 2+ 、Cu 2+ and Ni 2+ , where Fe 3+ The content is 102mg / L, Zn 2+ 、Cu 2+ and Ni 2+ The contents of 43mg / L, 117mg / L, 84mg / L respectively;

[0047] (2) After the reaction of step (1) is finished, adding an aqueous sodium hydroxide solution with a mass concentration of 10% to adjust the pH value of the chromium-containing wastewater to 9, remove heavy metal precipitates therein after filtering, an...

Embodiment 2

[0052] A method for preparing basic chromium sulfate with chromium-containing waste water of the present invention comprises the steps:

[0053] (1) Continuously add hydrogen peroxide with a mass concentration of 30% in 100L of chromium-containing wastewater until the cyanide detection test paper is detected as 0, and the color of hydrogen peroxide solution does not change after sampling, and the reaction is carried out at 90°C for 3 hours; The chromium content in the chromium wastewater is 642mg / L in terms of chromium, and the chromium-containing wastewater also includes Fe 3+ , Zn 2+ 、Cu 2+ and Ni 2+ , where Fe 3+ The content is 241mg / L, Zn 2+ 、Cu 2+ and Ni 2+ The contents of 83mg / L, 61mg / L, 145mg / L respectively;

[0054] (2) After the reaction in step (1) is finished, adding an aqueous potassium hydroxide solution with a mass concentration of 20% to adjust the pH value of the chromium-containing wastewater to 8, remove heavy metal precipitates therein after filtering...

Embodiment 3

[0059] A method for preparing basic chromium sulfate with chromium-containing waste water of the present invention comprises the steps:

[0060] (1) Continuously add hydrogen peroxide with a mass concentration of 30% in 500L of chromium-containing wastewater until the cyanide detection test paper is detected as 0, and the color of hydrogen peroxide solution does not change after sampling, and the reaction is carried out at 50°C for 8 hours; The chromium content in the chromium wastewater is 206mg / L in terms of chromium, and the chromium-containing wastewater also includes Fe 3+ , Zn 2+ 、Cu 2+ and Ni 2+ , where Fe 3+ The content is 246mg / L, Zn 2+ 、Cu 2+ and Ni 2+ The contents of 81mg / L, 64mg / L, 101mg / L respectively;

[0061] (2) After the reaction of step (1) is finished, adding an aqueous sodium hydroxide solution with a mass concentration of 20% to adjust the pH value of the chromium-containing wastewater to 8, remove the heavy metal precipitate therein after filtering...

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Abstract

The invention discloses a method for preparing basic chromium sulfate from chromium-contained wastewater. The method includes: adding excessive oxidizing agent into the chromium-contained wastewater to heat the chromium-contained wastewater up, adding alkaline liquor to adjust the pH (potential of hydrogen) value to be alkaline, filtering to remove heavy metal sediments in the chromium-contained wastewater, adding sulfuric acid into obtained filter liquor to adjust the pH value to be acidic, and adding oxalic acid till a chromium sulfate solution is obtained; adding alkaline liquor into the chromium sulfate solution with stirring so as to react to obtain syrup type viscous liquid, cooling to crystallize, centrifuging to obtain liquid basic chromium sulfate, and subjecting the liquid basicchromium sulfate to concentrating, washing, drying, smashing and screening to obtain solid basic chromium sulfate. According to the method, minute amount of heavy metal ions is removed by extracting principal components in the chromium-contained wastewater, and suitable conditions are furtherly chosen to prepare the basic chromium sulfate finally. The method for preparing the basic chromium sulfate from the chromium-contained wastewater is simple in technology, low in cost and high in product yield, and is not only capable of providing a new technical solution for recovery of the chromium-contained wastewater, but also is capable of preparing the basic chromium sulfate which is stable in state, high in purity and less in impurities.

Description

technical field [0001] The invention belongs to the field of animal feed addition, in particular to a method for preparing basic chromium sulfate from chromium-containing wastewater. Background technique [0002] Chromium is an important mineral needed by animals. It is widely distributed throughout the body in low concentrations in animals. It exists in the form of trivalent chromium. It is mainly distributed in the liver, kidney, and spleen, and the content in blood and feathers is relatively small. The bioavailability of trace elements in animal feed is closely related to the form in which they exist. Due to the unstable chemical properties of inorganic salts, the inorganic ions in them are prone to chemical reactions with other ingredients in the feed and become forms that are not easily absorbed. Studies have shown that the absorption rate of inorganic chromium by animals is 0.4% to 3%, and the absorption rate of inorganic trivalent chromium ions is only 1%. There are ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/08
CPCC01G37/08C01P2004/61C01P2006/80
Inventor 向阳葵彭红星邓敏周长虹黄逸强
Owner XINGJIA BIO ENG CO LTD
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