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Method for recycling aluminum hydroxide powder by using titanium dioxide waste acid and secondary aluminum ash

A technology of aluminum hydroxide and titanium dioxide waste acid, applied in chemical instruments and methods, aluminum compounds, inorganic chemistry, etc., can solve the problems of low utilization rate of valuable resources, difficult disposal of waste residue, high process cost, and increase disposal costs. The effect of income, less impurity content and high denitrification effect

Active Publication Date: 2021-03-26
GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0019] The purpose of the present invention is to provide a method for recycling aluminum hydroxide powder by using titanium white waste acid and secondary aluminum ash to solve the problems of high process cost, complicated operation, low utilization rate of valuable resources and waste residue in the existing aluminum ash treatment technology. Difficult to deal with

Method used

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  • Method for recycling aluminum hydroxide powder by using titanium dioxide waste acid and secondary aluminum ash

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Experimental program
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Effect test

Embodiment 1

[0046] Such as figure 1 Shown, a kind of method of utilizing titanium white waste acid and secondary aluminum ash to reclaim aluminum hydroxide powder of the present invention may further comprise the steps:

[0047] Step 1: Add concentrated sulfuric acid with a concentration of 98% to titanium white waste acid with a sulfuric acid mass concentration of 20% and a ferrous sulfate mass concentration of 5%. The final concentration of the titanium white waste acid is 45%, and the stirring reaction time is 0.5 h, cooling temperature 35 ℃, after crystallization, solid-liquid separation, obtain ferrous sulfate concentration and be 0.32% titanium white waste acid after pretreatment, ferrous sulfate removal rate is 93.6%;

[0048] Step 2: Use crushing equipment to crush and screen the secondary aluminum ash to obtain 80 meshes of crushed aluminum ash for later use;

[0049] Step 3: Add water to the reaction tank, then add the 80-mesh broken aluminum ash obtained in step 2 into the re...

Embodiment 2

[0055] Such as figure 1 Shown, a kind of method of utilizing titanium white waste acid and secondary aluminum ash to reclaim aluminum hydroxide powder of the present invention may further comprise the steps:

[0056] Step 1: Add concentrated sulfuric acid with a concentration of 80% to titanium white waste acid with a sulfuric acid mass concentration of 65% and a ferrous sulfate mass concentration of 10%. The final concentration of the titanium white waste acid is 65%, and the stirring reaction time is 3h , Cooling temperature 65 ℃, after crystallization, solid-liquid separation, obtain ferrous sulfate concentration and be 0.12% titanium white waste acid after pretreatment, the removal rate of ferrous sulfate is 98.8%;

[0057] Step 2: Use crushing equipment to crush and screen the secondary aluminum ash to obtain 200 meshes of crushed aluminum ash for later use;

[0058] Step 3: Add circulating water into the reaction tank, and then add the 200-mesh broken aluminum ash obta...

Embodiment 3

[0064] Such as figure 1 Shown, a kind of method of utilizing titanium white waste acid and secondary aluminum ash to reclaim aluminum hydroxide powder of the present invention may further comprise the steps:

[0065] Step 1: Add concentrated sulfuric acid with a concentration of 90% to titanium white waste acid with a sulfuric acid mass concentration of 55% and a ferrous sulfate mass concentration of 8%. The final concentration of the titanium white waste acid is 55%, and the stirring reaction time is 2h , Cooling temperature 45 ℃, after crystallization, solid-liquid separation, obtain ferrous sulfate concentration and be 0.2% titanium white waste acid after pretreatment, the removal rate of ferrous sulfate is 97.5%;

[0066] Step 2: Use crushing equipment to crush and screen the secondary aluminum ash to obtain 18 meshes of crushed aluminum ash for later use;

[0067] Step 3: Add tap water to the reaction tank, and then add the 18 mesh broken aluminum ash obtained in step 2...

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Abstract

The invention discloses a method for recycling aluminum hydroxide powder by using titanium dioxide waste acid and secondary aluminum ash, and belongs to the field of aluminum industrial waste treatment. The method comprises the steps of crushing, water leaching denitrification and desalination, waste acid pretreatment, acid leaching, impurity removal, precipitation and drying. The method for recycling the aluminum hydroxide powder by using the titanium dioxide waste acid and the secondary aluminum ash has the beneficial effects that the secondary aluminum ash is subjected to acid leaching after the titanium dioxide waste acid is pretreated, and the aluminum hydroxide powder is recycled; compared with a traditional process, the method has the advantages of being low in material consumption,low in treatment cost, good in economic benefit and the like; and valuable resources are recycled through a method of using waste to treat waste, the concept of circular economy, energy conservationand emission reduction is met, and the method can be widely applied to treatment of aluminum industrial waste.

Description

technical field [0001] The invention relates to the technical field of aluminum industrial waste, in particular to a method for recovering aluminum hydroxide powder by utilizing titanium white waste acid and secondary aluminum ash. Background technique [0002] Aluminum ash is a solid substance containing metallic aluminum and other components produced during the production, use and recycling of electrolytic aluminum, cast aluminum and other aluminum industries. The main composition and content (mass fraction) of aluminum ash are: 10% to 30% of aluminum metal; 20% to 40% of aluminum oxide; 7% to 15% of oxides of silicon, magnesium and iron; potassium, sodium, calcium and Magnesium chloride and other trace fluorides 15% to 30%. [0003] According to statistics, Guangxi operates more than 2 million tons of electrolytic aluminum production capacity, and electrolytic aluminum and its supporting aluminum processing downstream industry chain will produce at least about 30,000 to ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/02C22B21/00C01F7/26
CPCC22B7/02C22B7/006C22B21/0023C01F7/26Y02P10/20
Inventor 杨崎峰林宏飞丘能周郁文周思宏慕俊豪陆承高
Owner GUANGXI BOSSCO ENVIRONMENTAL PROTECTION TECH
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