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A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid

A technology for purification and separation of waste liquid, applied in the field of chemical separation, can solve the problems of poor chromium precipitation rate, poor product utilization, low ore-forming rate, etc., to achieve enhanced chromium-precipitation rate, significant economic benefits, and increased ore-forming rate Effect

Active Publication Date: 2021-10-26
CENT SOUTH UNIV
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  • 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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  • A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid
  • A method for regulating and purifying and separating chromium mineralization in chromium-containing waste liquid

Examples

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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 regulating and purifying and separating chromium mineralization in chromium-containing waste liquid, comprising: mixing zero-valent iron powder and Na 2 After S is mixed at a molar ratio of 2 to 10:1, ball milling is carried out to obtain modified sulfide zero-valent iron powder; the chromium-containing waste liquid is adjusted to acidity, and then a mineralization accelerator is added to the chromium-containing waste liquid for pretreatment. treatment to obtain a pretreatment solution, wherein the mineralization accelerator includes tartaric acid; adding the modified zerovalent iron sulfide powder to the pretreatment solution for reaction to obtain a liquid to be separated; adding hydrogen to the liquid to be separated Sodium oxide is used to obtain a solution containing ferrochrome sludge, and the solution containing ferrochrome sludge is subjected to solid-liquid separation treatment to obtain the separated ferrochrome sludge. The invention provides a new method for regulating and purifying chromium mineralization and separation in chromium-containing waste liquid, which can increase the chromium precipitation rate in chromium-containing waste liquid, increase the ore-forming speed, improve product utilization, and obtain high-quality chrome alloy.

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 Patents(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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