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Deferrization method of iron-containing liquor

A technology of solution and weak base solution, which is applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc. It can solve problems such as narrow pH control range, long reaction time, and incomplete iron removal. Achieve the effects of easy control of operating conditions, less adsorption and co-precipitation, and high iron removal efficiency

Active Publication Date: 2007-12-26
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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  • Abstract
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Problems solved by technology

[0003] The jarosite method requires sufficient sulfate ions and alkali metal or ammonium ions in the solution, the reaction temperature is between 85-100°C, iron removal is not complete, the general residual iron concentration is greater than 0.2g / L, and the pH control range is narrow , Difficult to control, large amount of residue, long reaction time

Method used

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  • Deferrization method of iron-containing liquor

Examples

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Effect test

Embodiment 1

[0024] Iron removal of nickel, cobalt and iron-containing waste liquid in nickel sulfate and cobalt production enterprises.

[0025] Waste liquid composition: total iron Fe: 13.49g / L, Ni 2+ .90.82g / L,Co 2+ : 13.47g / L

[0026] 1. Preparation of iron citrine seeds:

[0027] Weigh 2kg, 50kg, and 500kg of EDTA, green vitriol, and water, mix and stir until the green vitriol is completely dissolved; then, slowly add 2mol / L ammonia water at a rate of 70L / hour until the solution pH=8.5 , stop dripping ammonia water; continue to stir for 15 minutes, start oxygen oxidation, until the pH drops to about 4 and stabilize, continue to add ammonia water dropwise, when the pH is adjusted to about 5, stop dripping ammonia water, with the progress of the oxidation reaction If the reaction is carried out, the pH will gradually decrease and become stable. Similarly, add ammonia water in the interval and gradually increase the pH to about 7. At this time, the pH has stabilized and will not decre...

Embodiment 2

[0031] Iron removal of manganese-containing solution in manganese sulfate production enterprises.

[0032] Solution composition: total iron Fe: 13.18g / L, Mn 2+ : 49.91g / L.

[0033] One, preparation ferric citrine seed: with embodiment one.

[0034] 2. Iron removal steps:

[0035] Add hydrogen peroxide to reduce Fe in manganese solution 2+ fully oxidized to Fe 3+ , then use Na 2 CO 3 After adjusting the pH of the solution to about 1, add 500L of newly prepared iron citrine seed solution (containing about 20g / L iron) to the 2000L reactor, stir at a speed of 60r / min, and drop the oxidized manganese-containing solution at the same time and a concentration of 15% Na 2 CO 3 Solution, the dropping rate of manganese solution is about 1000L / hour, Na 2 CO 3 The drop rate of the solution is about 500L / hour and the pH of the reaction solution is controlled at 4.5-5.0. After 60 minutes of reaction, stop adding Na 2 CO 3 and manganese-containing solution, continue to stir for 5-...

Embodiment 3

[0038] Iron removal for zinc-containing solution in zinc oxide production enterprises.

[0039] Solution composition: total iron Fe: 11.53g / L, Zn 2+ : 68.42g / L.

[0040] One, preparation ferric citrine seed: with embodiment one.

[0041] 2. Iron removal steps:

[0042] Add KClO 3 Fe in zinc-containing solution 2+ fully oxidized to Fe 3+ , then use Na 2 CO 3 After adjusting the pH of the solution to about 1, add 500L of newly prepared iron citrine seed solution (containing about 20g / L iron) to the 2000L reactor, stir at a speed of 60r / min, and add the oxidized zinc solution dropwise at the same time And ammonia water with a concentration of 6%, the dropping rate of the zinc-containing solution is about 680L / hour, the flow rate of the ammonia water is about 320L / hour, and the pH of the reaction solution is controlled at 4.0-4.5. After 90 minutes of reaction, stop adding ammonia water and zinc-containing solution, continue to stir for 5-10 minutes, then stand still for 10...

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Abstract

The disclosed deironing method for iron-contained solution comprises: oxidizing the solution for pretreatment, preparing ferrite yellow crystal seed; adding the said seed liquid into reactor, dropping oxidized solution and weak base solution simultaneously; when the liquid volume achieves reactor effective volume, extracting the reaction liquid to filter and obtain the objective solution. This invention has fast reaction speed and well effect with small investment at normal temperature.

Description

technical field [0001] The invention relates to a method for removing iron from an iron-containing solution. Background technique [0002] The basic methods for removing iron from iron-containing solutions include jarosite method, goethite method, hematite method, Fe(OH) 3 Precipitation. The disadvantages of these methods are as follows: [0003] The jarosite method requires sufficient sulfate ions and alkali metal or ammonium ions in the solution, the reaction temperature is between 85-100°C, iron removal is not complete, the general residual iron concentration is greater than 0.2g / L, and the pH control range is narrow , Difficult to control, large amount of residue, long reaction time. The goethite method requires the reaction temperature to be between 70-100°C. Oxidation under high temperature conditions will reduce the solubility of oxygen, and the utilization efficiency of oxygen is low, and requires Fe in the initial solution 3+ The concentration is less than 1g / L,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/64C02F1/72C02F1/74
Inventor 陈志传童张法李海毛谙章
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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