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Method for mineralization regulation and purification separation of chromium in chromium-containing waste liquid

A technology for purifying separation and waste liquid, applied in the field of chemical separation, can solve the problems of low ore-forming rate, poor chromium deposition rate, poor product utilization, etc. Effect

Active Publication Date: 2021-09-07
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The main purpose of the present invention is to provide a method for regulating and purifying chromium mineralization and separation in chromium-containing waste liquid, aiming to solve the above-mentioned technical problems of poor chromium precipitation rate, low mineralization rate and poor product utilization

Method used

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  • Method for mineralization regulation and purification separation of chromium in chromium-containing waste liquid
  • Method for mineralization regulation and purification separation of chromium in chromium-containing waste liquid

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Effect test

Embodiment 1

[0065] A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid, comprising:

[0066] 1. Take the chromium-containing waste liquid from the iron and steel smelter for use. The main chemical components of the chromium-containing waste liquid are shown in the following table:

[0067] element total chromium Hexavalent chromium P Si Zn S Na Content (mg / L) 5324.10 3625.0 1412.40 1159.00 578.34 322.13 128.09

[0068] 2. First, add 20 g of zero-valent iron powder and 250 mL of 40 g / L Na 2 S solution, reacted at a ball milling speed of 300 r / min for 1 h, and then washed with deoxygenated water; the modified zero-valent iron sulfide powder washed with deoxygenated water was collected under the action of an external magnetic field, and then placed in a vacuum oven at 105 °C Dry for 2 h, and store in a vacuum seal after drying to prevent oxidation.

[0069] 3. Take 25mL of the above-mentioned c...

Embodiment 2

[0074] A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid, comprising:

[0075] 1. Take the chromium-containing waste liquid from the iron and steel smelter for use. The main chemical components of the chromium-containing waste liquid are shown in the following table:

[0076] element total chromium Hexavalent chromium P Si Zn S Na Content (mg / L) 5324.10 3625.0 1412.40 1159.00 578.34 322.13 128.09

[0077] 2. First, add 20 g of zero-valent iron powder and 250 mL of 40 g / L Na 2 S solution, reacted at a ball milling speed of 300 r / min for 1 h, and then washed with deoxygenated water; the modified zero-valent iron sulfide powder washed with deoxygenated water was collected under the action of an external magnetic field, and then placed in a vacuum oven at 105 °C Dry for 2 h, and store in a vacuum seal after drying to prevent oxidation.

[0078] 3. Take 25mL of the above-mentioned...

Embodiment 3

[0083] A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid, comprising:

[0084] 1. Take the chromium-containing waste liquid from the iron and steel smelter for use. The main chemical components of the chromium-containing waste liquid are shown in the following table:

[0085] element total chromium Hexavalent chromium P Si Zn S Na Content (mg / L) 5324.10 3625.0 1412.40 1159.00 578.34 322.13 128.09

[0086] 2. First, add 20 g of zero-valent iron powder and 250 mL of 40 g / L Na 2 S solution, reacted at a ball milling speed of 300 r / min for 1 h, and then washed with deoxygenated water; the modified zero-valent iron sulfide powder washed with deoxygenated water was collected under the action of an external magnetic field, and then placed in a vacuum oven at 105 °C Dry for 2 h, and store in a vacuum seal after drying to prevent oxidation.

[0087] 3. Take 25mL of the above-mentioned...

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Abstract

The invention provides a method for mineralization regulation and control and purification separation of chromium in chromium-containing waste liquid. The method comprises the following steps: mixing zero-valent iron powder and Na2S according to a molar ratio of (2-10): 1, and carrying out ball milling to obtain modified sulfurized zero-valent iron powder; adjusting the chromium-containing waste liquid to be acidic, adding a mineralization accelerant into the chromium-containing waste liquid for pretreatment, and obtaining a pretreatment solution, wherein the mineralization accelerant comprises tartaric acid; adding the modified sulfurized zero-valent iron powder into the pretreatment solution for reaction to obtain a to-be-separated solution; adding sodium hydroxide into the to-be-separated liquid to obtain a solution containing the ferrochrome sludge, and carrying out solid-liquid separation treatment on the solution containing the ferrochrome sludge to obtain the separated ferrochrome sludge. The invention provides a novel method for mineralizing, regulating, purifying and separating chromium in the chromium-containing waste liquid, the chromium precipitation rate in the chromium-containing waste liquid can be increased, the mineralization speed can be increased, the product utilization degree can be improved, and high-quality ferrochrome can be obtained.

Description

technical field [0001] The invention relates to the field of chemical separation, in particular to a method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid. Background technique [0002] Chromium-containing waste liquid produced in steel, leather, electroplating and other industries will not only pollute the environment, but also cause waste of chromium resources. In order to make full use of resources, chromium-containing waste liquid has become one of the important sources of raw materials for chromium recovery. Among them, the most commonly used method for recovering chromium from chromium-containing waste liquid is the reduction precipitation method. However, in the process of chromium separation and recovery Among them, due to the existence of heteroelements, the ore-forming rate and recovery rate of chromium are limited to a certain extent, so that the chromium content after ore-forming is low, and it also affects...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F101/22C02F101/20
CPCC02F9/00C02F1/705C02F1/66C02F1/5236C02F2101/22C02F2101/203C02F1/02
Inventor 梁彦杰林璋土育玲颜旭刘学明廖邑雯柯勇田晨
Owner CENT SOUTH UNIV
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