Method for removing aluminum from strong alkali solution and application

A technology of alkaline solution and aluminum remover, applied in chemical instruments and methods, alkali metal compounds, recycling technology, etc., can solve the problems of difficult processing and high cost, and achieve the effect of wide applicability

Pending Publication Date: 2022-05-13
GUANGDONG BRUNP RECYCLING TECH +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The alkaline leaching method first dissolves aluminum with alkali, and then adjusts the pH to...

Method used

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  • Method for removing aluminum from strong alkali solution and application
  • Method for removing aluminum from strong alkali solution and application
  • Method for removing aluminum from strong alkali solution and application

Examples

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Effect test

Embodiment 1

[0033] The method for removing aluminum in the sodium hydroxide strong alkali solution of the present embodiment comprises the following specific steps:

[0034] S1: Take aluminum-containing sodium hydroxide strong alkali solution, concentrate it, and filter to obtain 1.5L of the first concentrated solution, with a pH of 13.9 and a concentration of 83.0g / L, in which aluminum ions are 55.6g / L;

[0035] S2: Put 1.5L of the first concentrated solution in the reaction tank, add aluminum removing agent to the first concentrated solution, the aluminum removing agent is composed of 252.8g of sodium silicate and 98.5g of silicon dioxide, and mix to obtain a mixed solution;

[0036] S3: The mixed solution was reacted at 150°C for 2 hours, the temperature of the reacted solution was lowered to 25°C, the liquid-solid of the lye after the reaction was separated through a filter press, and dried to obtain 395.8g of aluminum-silicon slag and 1.2L of filtrate;

[0037] S4: Evaporate and crys...

Embodiment 2

[0044] The method for removing aluminum in the lithium hydroxide strong alkali solution of the present embodiment comprises the following specific steps:

[0045] S1: Take aluminum-containing lithium hydroxide strong alkali solution, concentrate it, and filter to obtain 1.5L of the first concentrated solution, with a pH of 14.2 and a concentration of 62.5g / L, in which aluminum ions are 46.0g / L;

[0046] S2: Put 1.5L of the first concentrated solution in the reaction tank, add an aluminum removing agent to the first concentrated solution, the aluminum removing agent is composed of 174.5g of lithium silicate and 67.9g of silicon dioxide, and mix to obtain a mixed solution;

[0047] S3: React the mixed solution at 150° C. for 2 hours, cool down the reacted solution to 25° C., separate the liquid and solid from the reacted lye through a filter press, and dry to obtain 327.4 liters of aluminum-silicon slag and 1.2 L of filtrate;

[0048] S4: Evaporate and crystallize 1.2L of the fi...

Embodiment 3

[0054] The method for removing aluminum in the lithium hydroxide strong alkali solution of the present embodiment comprises the following specific steps:

[0055]S1: Take aluminum-containing lithium hydroxide strong alkali solution, concentrate it, and filter to obtain 1.5L of the first concentrated solution, with a pH of 14.8, a concentration of 70.2g / L, and a concentration of 4.5g / L of aluminum ions;

[0056] S2: Put 1.5L of the first concentrated solution in the reaction tank, add an aluminum removing agent to the first concentrated solution, the aluminum removing agent is composed of 17.1g of lithium silicate and 6.6g of silicon dioxide, and mix to obtain a mixed solution;

[0057] S3: React the mixed solution at 150° C. for 2 hours, cool down the reacted solution to 25° C., separate the liquid and solid from the reacted lye through a filter press, and dry to obtain 32.0 g of aluminum-silicon slag and 1.2 L of filtrate;

[0058] S4: Evaporate and crystallize 1.2L of the fi...

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Abstract

The invention belongs to the technical field of environmental protection, and discloses a method for removing aluminum from a strong alkali solution and application, the method comprises the following steps: concentrating and filtering the strong alkali solution, taking a first concentrated solution, adding the first concentrated solution into an aluminum removal agent, reacting, cooling, and carrying out solid-liquid separation to obtain silicon slag and filtrate; concentrating and filtering the filtrate to obtain a metal hydroxide crystal and a second concentrated solution; the aluminum removal agent comprises the following components: silicate and silicon dioxide; the strong alkali solution contains aluminate ions. According to the method, silicate and silicon dioxide are used as aluminum removal agents in the strong alkali solution, aluminum is made to generate water-insoluble aluminosilicate under the condition that the original pH of the solution is not changed, aluminum in the strong alkali solution is removed to 30-100 ppm, corresponding sodium hydroxide, potassium hydroxide or lithium hydroxide crystals can be recycled, and mother liquor is recycled.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method and application of a strong alkali solution for removing aluminum. Background technique [0002] The removal of aluminum is involved in the fields of battery recycling and hydrometallurgy. At present, the methods for removing aluminum include alkaline leaching, extraction, and pretreatment. Aluminum has amphoteric properties and exists in the form of aluminate in alkaline solution, so it is a difficult problem to remove aluminum under strong alkaline conditions. The alkaline leaching method first dissolves aluminum with alkali, and then adjusts the pH to 9.0 with acid to precipitate Al(OH) 3 Precipitation, this method is costly and difficult to handle. [0003] Based on this, in order to effectively remove aluminum in strong alkali solution, a method for efficiently removing aluminum in strong alkali solution is developed. Contents of the...

Claims

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Application Information

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IPC IPC(8): C22B7/00C22B3/44H01M10/54H01M6/52C22B26/10C22B26/12C01D1/32C01D15/02
CPCC22B7/006C22B3/44H01M10/54H01M6/52C22B26/10C22B26/12C01D1/32C01D15/02Y02W30/84
Inventor 苗耀文李长东乔延超李波陈若葵阮丁山
Owner GUANGDONG BRUNP RECYCLING TECH
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