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Method and device for quickly dissolving alumina out of sintered clinker of high-alumina fly ash

A high-alumina fly ash, alumina technology, applied in the removal of alumina/aluminum hydroxide, solid waste, etc., can solve the problems of long dissolution time, secondary reaction of dicalcium silicate decomposition, etc.

Inactive Publication Date: 2010-01-20
NORTHEASTERN UNIV ENG & RES INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the dissolution method in the current process of extracting aluminum from fly ash, the present invention provides a method and device for rapidly dissolving alumina from high-alumina fly ash sintered clinker, which solves the problem of extracting aluminum from fly ash. In the dissolution process, the dissolution time is long, the secondary reaction of dicalcium silicate decomposition is serious, etc.

Method used

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  • Method and device for quickly dissolving alumina out of sintered clinker of high-alumina fly ash
  • Method and device for quickly dissolving alumina out of sintered clinker of high-alumina fly ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] The process is as follows.

[0033] The four Al-containing 2 o 3 Mix with NaOH solution in the preparation tank to prepare the adjustment solution. These four kinds of solutions are: all the seeds are filtered from the mother liquor, all the silicon-calcium slag washings are washed, and all the finished products are filtered from Al(OH) 3 Part of the carbon mother liquor from the washing liquid and the evaporation tank tank area, the amount of the part of the carbon mother liquor used is 30% of the total amount of the carbon mother liquor.

[0034] Among them, the Al in the mother liquor separated from the seed filtration 2 o 3 : 68.69g / l, NaOH: 135.19g / l;

[0035] Al in silicon calcium slag washing liquid from silicon calcium slag washing 2 o 3 : 48.30g / l, NaOH: 47.99g / l;

[0036] Al(OH) from finished product filtration 3 Al in washing solution 2 o 3 : 17.56g / l, NaOH: 35.39g / l;

[0037] Part of the carbon from the evaporator tank area is divided into Al in ...

Embodiment 2

[0051] The process is as follows.

[0052] The four Al-containing 2 o 3 Mix with NaOH solution in the preparation tank to prepare the adjustment solution. These four kinds of solutions are: all the seeds are filtered from the mother liquor, all the silicon-calcium slag washings are washed, and all the finished products are filtered from Al(OH) 3 Part of the carbon mother liquor from the washing liquid and the evaporation tank tank area, the amount of the part of the carbon mother liquor used is 35% of the total amount of the carbon mother liquor.

[0053] Among them, the Al in the mother liquor separated from the seed filtration 2 o 3 : 69.32g / l, NaOH: 139.20g / l;

[0054] Al in silicon calcium slag washing liquid from silicon calcium slag washing 2 o 3 : 49.68g / l, NaOH: 49.55g / l;

[0055] Al(OH) from finished product filtration 3 Al in washing solution 2 o 3 : 19.25g / l, NaOH: 39.33g / l;

[0056] Part of the carbon from the evaporator tank area is divided into Al in ...

Embodiment 3

[0070] The process is as follows.

[0071] The four Al-containing 2 o 3 Mix with NaOH solution in the preparation tank to prepare the adjustment solution. These four kinds of solutions are: all the seeds are filtered from the mother liquor, all the silicon-calcium slag washings are washed, and all the finished products are filtered from Al(OH) 3 Part of the carbon mother liquor from the washing liquid and the evaporation tank tank area, the amount of the part of the carbon mother liquor used is 25% of the total amount of the carbon mother liquor.

[0072] Among them, the Al in the mother liquor separated from the seed filtration 2 o 3 : 65.57g / l, NaOH: 130.36g / l;

[0073] Al in silicon calcium slag washing liquid from silicon calcium slag washing 2 o 3 : 45.85g / l, NaOH: 45.63g / l;

[0074] Al(OH) from finished product filtration 3 Al in washing solution 2 o 3 : 15.11g / l, NaOH: 30.39g / l;

[0075] Part of the carbon from the evaporator tank area is divided into Al in ...

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Abstract

The invention provides a method and a device for quickly dissolving alumina out of sintered clinkers of high-alumina fly ash. The device comprises a surge tank, a cylindrical dissolving device, a water-whirling device, a settling tank, a crude liquid tank, a rod mill, a two-stage dissolved slurry tank, a crude liquid pump and a two-stage dissolved slurry pump. The method comprises the following processes: Al(OH)3 washing liquor obtained by filtering spent liquor from seed precipitation, silicon and calcium slag washing liquor and finished products and partial spent liquor from carbonization precipitation are blended into adjustment liquid to be transported into the cylindrical dissolving device together with the sintered clinkers of the fly ash to undergo countercurrent dissolving, the overflow enters the water-whirling device, the overflow from the water-whirling device enters the settling tank to be further flocculated, settled and separated, and then the overflow enters the crude liquid tank to be pumped to the conventional process of desiliconizing; base flow from a cyclone, secondary silicon and calcium slag washing liquor and return sand in the cylindrical dissolving device enter the rod mill to undergo two-stage dissolving, and the two-stage dissolved grout and the base flow from the settling tank are transported to the process of silicon and calcium slag washing. The invention can solve the problems of long dissolving time, severe secondary decomposition reaction of dicalcium silicate and the like in the dissolving process for extracting aluminium from fly ash.

Description

technical field [0001] The invention relates to the technical field of environmental protection and alumina materials, in particular to the technology of comprehensively utilizing fly ash to prepare alumina. Background technique [0002] Fly ash resources are abundant, and the output is large and concentrated. Every time the power plant generates 1000Kwh of electricity, it produces an average of 87kg of fly ash. With the continuous development of the power industry, its emissions will increase year by year. Waste fly ash not only occupies land, but also pollutes the environment, and the harmful components contained in it will endanger organisms and human health. Since fly ash contains a large amount of alumina and some valuable rare metals, if it can be extracted and utilized, it can not only realize the comprehensive utilization of waste but also solve the problem of lack of alumina production resources in my country. Therefore, the systematic research, development and ut...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 赵成明张战军杨再明闫学良黎娜王宁
Owner NORTHEASTERN UNIV ENG & RES INST CO LTD
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