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Production process of iron-free high-purity aluminum sulfate

A production process, aluminum sulfate technology, applied in the direction of aluminum sulfate, aluminum sulfur compounds, flocculation/precipitation water/sewage treatment, etc., can solve the problem of high iron content in bauxite, achieve high alumina content and low iron element content , the effect of large precipitated particles

Active Publication Date: 2022-07-12
HENGYANG JIANHENG IND DEV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main raw materials for the production of aluminum sulfate by sulfuric acid method are sulfuric acid and bauxite. However, due to the high iron content in bauxite, iron removal is not performed during the production process, and the mass fraction of iron in the product aluminum sulfate is as high as 0.5%.

Method used

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  • Production process of iron-free high-purity aluminum sulfate
  • Production process of iron-free high-purity aluminum sulfate

Examples

Experimental program
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Effect test

Embodiment 1

[0029] The preparation method of ion adsorbent comprises the following steps:

[0030] (1) Preparation of activated sepiolite: 100g of sepiolite and 1000g of 0.5mol / L NaOH aqueous solution were placed in a reaction flask, and mechanically stirred for 1h to obtain activated sepiolite;

[0031] (2) Add 100g of activated sepiolite and 1300mL of absolute ethanol into the reaction flask, stir mechanically evenly, add 40g of 3-aminopropyltriethoxysilane, and adjust the pH of the solution with a mass fraction of 25% acetic acid aqueous solution to 40 ℃, heat preservation reaction for 24h to obtain modified sepiolite;

[0032] (3) 100g p-carboxybenzaldehyde, 5000mL dimethyl sulfoxide, and 4000mL deionized water were mixed to prepare p-carboxybenzaldehyde mixed solution;

[0033] (4) Add 100g of modified sepiolite and 2800mL of dimethyl sulfoxide into the reaction kettle, add a mixed solution of p-carboxybenzaldehyde containing 50g of p-carboxybenzaldehyde, stir mechanically evenly, h...

Embodiment 2

[0035] The preparation method of ion adsorbent comprises the following steps:

[0036] (1) Preparation of activated sepiolite: 100g of sepiolite and 1200g of 0.5mol / L NaOH aqueous solution were placed in a reaction flask, and mechanically stirred for 1.5h to obtain activated sepiolite;

[0037] (2) Add 100 g of activated sepiolite and 2000 mL of absolute ethanol into the reaction flask, stir mechanically evenly, add 50 g of 3-aminopropyl triethoxysilane, and adjust the pH of the solution with a mass fraction of 40% acetic acid aqueous solution to 60 ℃, heat preservation reaction for 24h to obtain modified sepiolite;

[0038] (3) 100g p-carboxybenzaldehyde, 5000mL dimethyl sulfoxide, and 4000mL deionized water were mixed to prepare p-carboxybenzaldehyde mixed solution;

[0039] (4) Add 100g of modified sepiolite and 3500mL of dimethyl sulfoxide into the reaction kettle, add a mixed solution of p-carboxybenzaldehyde containing 80g of p-carboxybenzaldehyde, stir mechanically eve...

Embodiment 3

[0041] The preparation method of ion adsorbent comprises the following steps:

[0042] (1) Preparation of activated sepiolite: 100g of sepiolite and 1500g of 1mol / L NaOH aqueous solution were placed in a reaction flask, and mechanically stirred for 2h to obtain activated sepiolite;

[0043] (2) Add 100g of activated sepiolite and 3000mL of absolute ethanol into the reaction flask, stir mechanically evenly, add 75g of 3-aminopropyltriethoxysilane, the mass fraction of 25-45% acetic acid aqueous solution to adjust the pH of the solution, and heat up. To 70 ℃, heat preservation reaction for 36h, to obtain modified sepiolite;

[0044] (3) 100g p-carboxybenzaldehyde, 5000mL dimethyl sulfoxide, and 4000mL deionized water were mixed to prepare p-carboxybenzaldehyde mixed solution;

[0045] (4) Add 100g of modified sepiolite and 4500mL of dimethyl sulfoxide into the reaction kettle, add a mixed solution of p-carboxybenzaldehyde containing 100g of p-carboxybenzaldehyde, stir mechanica...

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Abstract

The invention discloses a production process of iron-free high-purity aluminum sulfate, and relates to the technical field of flocculant production. The production process of the iron-free high-purity aluminum sulfate comprises the following steps: (1) grinding and activating fly ash; (2) carrying out acid leaching on the fly ash particles, filtering and separating to obtain a filter cake; (3) roasting the filter cake at high temperature, adding water, stirring and hydrolyzing to obtain a mixed solution; (4) evaporating and crystallizing the mixed solution to obtain crystals; and (5) adsorbing and crystallizing the crystal to obtain the iron-free high-purity aluminum sulfate. The aluminum sulfate obtained by the aluminum sulfate production process disclosed by the invention is low in iron content and high in aluminum oxide content.

Description

technical field [0001] The invention relates to the technical field of flocculant production, in particular to a production process of iron-free high-purity aluminum sulfate. Background technique [0002] With the development of industry, the consumption of industrial water has increased sharply, and the industrial wastewater produced has also increased accordingly. There are many methods of water treatment, such as flocculation sedimentation method, biochemical method and ion exchange method, etc. The flocculation sedimentation method is due to its low composition, Simple operation is widely used in the field of water treatment. As flocculants in water treatment, there are mainly two types of iron salts and aluminum salts. Iron salt flocculants have good flocculation effect, but iron ions have adverse effects on drinking water and various industrial water, and are highly corrosive to equipment when used. , It is generally not allowed to be used in water supply treatment, s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/74C02F1/52
CPCC01F7/74C02F1/5245C01P2006/80Y02P10/20
Inventor 何青峰欧阳承文
Owner HENGYANG JIANHENG IND DEV
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