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Method for Simultaneous Separation of Chromium, Iron and Aluminum from Acidic Metal Solutions Containing Chromium, Iron and Aluminum

A metal solution and simultaneous separation technology, applied in the field of chemical separation, can solve the problems of long process, high cost of energy consumption and alkali consumption, inability to remove chromium and aluminum at the same time, and achieve the effect of simple process, low cost and low energy consumption

Active Publication Date: 2017-02-15
池州西恩新材料科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Conventional iron removal methods are jarosite method and needle iron method, both of which require high temperature (about 90°C) and alkali addition, long process, high energy consumption and alkali consumption cost
These methods cannot remove chromium and aluminum at the same time, other methods are required to remove chromium and aluminum

Method used

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  • Method for Simultaneous Separation of Chromium, Iron and Aluminum from Acidic Metal Solutions Containing Chromium, Iron and Aluminum

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: Separate chromium, iron, aluminum electroplating sludge sulfuric acid solution (stock solution) simultaneously from electroplating sludge sulfuric acid solution: pH: 2.0, concentration (unit: g / L): Fe 3+ : 3.5, Cr 3+ : 4.1, Al 3+ : 0.5, Ni 2+ : 6.8, Cu 2+ : 3.4, Zn 2+ : 6.2.

[0045] Separation process:

[0046] (1) Add dolomite (calcium carbonate and magnesium carbonate) powder under air stirring, neutralize to pH 5.0 in one stage, and precipitate at a temperature of 43°C;

[0047] (2) Carry out solid-liquid separation with a plate and frame filter press to obtain a first-grade filter residue and separation liquid, the main concentration (g / L) of the separation liquid is: Fe 3+ : 0.02, Cr 3+ : 0.03, Al 3+ : 0.01, Ni 2+ : 5.4, Cu 2+ : 2.8, Zn 2+ : 5.5;

[0048] (3) The primary filter residue is neutralized with the stock solution until the stock solution pH is 2.8; after neutralization, the stock solution returns to step (1) to continue precipi...

Embodiment 2

[0051] Embodiment 2: Separate chromium and iron simultaneously from stainless steel pickling solution

[0052] Stainless steel pickling solution (stock solution): pH: 1.5, concentration (g / L): Fe 总 : 15.7, Cr 3+ : 1.7, Ni 2+ : 1.6.

[0053] Separation process:

[0054] (1) Neutralize and aerate and oxidize to pH 2.0 as the oxidation stock solution;

[0055] (2) Take the oxidation stock solution and add sodium hydroxide to neutralize to pH 4.5, and conduct precipitation at a temperature of 35°C;

[0056] (2) Carry out solid-liquid separation with a plate and frame filter press to obtain a first-grade filter residue and a separation liquid, and the concentration of the separation liquid (g / L) is: Fe 3+ : 0.022, Cr 3+ : 0.010, Ni 2+ :3;

[0057] (3) The separated primary filter residue is neutralized with the oxidation stock solution to pH 3.2 of the oxidation stock solution;

[0058] (4) After plate and frame pressure filtration, the filter cake was washed with 3 times ...

Embodiment 3

[0060] Embodiment 3: Separation of chromium, iron and aluminum simultaneously from laterite ore sulfuric acid leaching solution

[0061] Laterite sulfuric acid immersion solution (stock solution), pH: 1.8, concentration (mg / L): Fe 总 : 13.6, Cr 3+ : 0.30, Al 3+ : 0.24, Ni 2 + : 2.8, Co 2+ : 0.11.

[0062] Separation process:

[0063] (1) First neutralize the aeration oxidation, Fe 2+ converted to Fe 3+ , as the oxidation stock solution;

[0064] (2) add lime water to neutralize to pH 4.0, temperature 47 ℃, precipitate;

[0065] (3) After solid-liquid separation, the primary filter residue and separation liquid are obtained, and the ion concentration of the separation liquid (mg / L): Fe +3 : 0.011, Cr 3 + : 0.002, Al 3+ : 0.001, Ni 2+ : 2.2, Co 2+ : 0.09.

[0066] (4) The primary filter residue is neutralized with the stock solution to pH 3.5 of the stock solution;

[0067] (5) After the plate and frame filter press, the filter cake is washed with 4 times the vol...

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Abstract

The invention relates to a method for simultaneously separating chromium, iron and aluminum from an acidic metal solution containing chromium, iron and aluminum. The method comprises the following steps: firstly, primarily neutralizing the acidic metal solution containing chromium, iron and aluminum, adjusting the pH to 4.0-5.0 and simultaneously settling chromium, iron and aluminum; then, carrying out solid-liquid separation to obtain primary filter residues and a separating liquid; neutralizing the primary filter residues by the acidic metal solution containing chromium, iron and aluminum till the pH of the acidic metal solution containing chromium, iron and aluminum is 2.8-3.5; then carrying out solid-liquid separation and washing the separated solid to obtain a hydroxide mixture of chromium, iron and aluminum. The method is simple in flow, free from high temperature in the treatment process and relatively low in energy consumption. Moreover, the used additive is relatively low in cost. The method provided by the invention can be used for simultaneously removing chromium, iron and aluminum in the acidic metal solution and under the condition that the chromium, iron and aluminum removal rate is greater than 95%, the loss rate of copper, nickel and cobalt is less than 4%.

Description

technical field [0001] The invention relates to a method for separating chromium, iron and aluminum from electroplating sludge pickling solution or metal surface pickling solution, and belongs to the field of chemical separation. Background technique [0002] When refining nickel, copper, zinc, and cobalt products by hydrometallurgy, iron and aluminum ions are removed in acidic solution, while in electroplating sludge pickling solution and metal surface pickling, in addition to iron ions, chromium and aluminum ions need to be separated . Conventional iron removal methods are jarosite method and needle iron method, both of which require high temperature (about 90°C) and alkali addition, long process, high energy consumption and alkali consumption cost. These methods cannot remove chromium and aluminum at the same time, and other methods are required to remove chromium and aluminum. Contents of the invention [0003] The purpose of the present invention is to overcome the ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B3/44C22B34/32C22B21/00
CPCY02P10/20
Inventor 赵志安杨徐烽徐克俭
Owner 池州西恩新材料科技有限公司