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A method for producing 4a zeolite by using waste alumina and quartz sand

A technology of alumina and quartz sand, applied in the direction of crystalline aluminosilicate zeolite, A-type crystalline aluminosilicate zeolite, etc., can solve the problems of high energy consumption, high raw material cost, and large impact of raw material market fluctuations, so as to reduce evaporation load, reduce production costs, and avoid transportation problems

Active Publication Date: 2016-11-16
LUOYANG TIANPING MOLECULAR SIEVE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method of hydrothermally synthesizing 4A molecular sieve requires 0.5 tons of aluminum hydroxide, 0.6 tons of water glass, and 0.4 tons of caustic soda per ton of 4A zeolite product. The cost of raw materials is high, and the raw materials are greatly affected by market fluctuations, which is not conducive to stable production.
In addition, the traditional method has a long process flow and large energy consumption, which is not conducive to energy saving and consumption reduction. Therefore, it has always been a problem that people in the industry are working hard to solve to invent a production method of 4A zeolite with low raw material cost and short process flow.

Method used

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  • A method for producing 4a zeolite by using waste alumina and quartz sand

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Preparation of Part1 Sodium Aluminate Solution

[0026] Take the waste alumina in the alumina industry, and it mainly contains the following components after testing: 82%Al 2 o 3 , 5% silica, 5% calcium oxide and 2% iron, according to Al in alumina waste 2 o 3 content, according to Na 2 O, Al 2 o 3 Add soda ash at a molar ratio of 1.15, mix well, and bake at 950°C through a rotary kiln. The roasting time is controlled at 0.5h by the number of rotations of the rotary kiln and the amount of material to be fed, and the roasted material is used with Na 2 O concentration is the stripping of 75g / L alkaline aqueous solution, makes the Na in the whole solution 2 O / Al 2 o 3 The molar ratio is 2 to obtain a sodium aluminate solution.

[0027] Preparation of Part2 liquid water glass

[0028] 4A zeolite dilute mother liquor is evaporated to make Na 2 The O concentration reaches 3.5mol / l, according to the Na of the evaporated mother liquor 2 O concentration, the additio...

Embodiment 2

[0033] Preparation of Part1 Sodium Aluminate Solution

[0034] Take the waste alumina in the alumina industry, and it mainly contains the following components after testing: 82%Al 2 o 3 , 5% silica, 5% calcium oxide and 2% iron, according to Al in alumina waste 2 o 3 content, according to Na 2 O, Al 2 o 3 Add soda ash at a molar ratio of 1.0, mix well, and roast at 1000°C through a rotary kiln. The roasting time is controlled at 0.3h by the number of revolutions of the rotary kiln and the amount of feeding, and the roasted materials are used with Na 2 O concentration is the stripping of 50g / L alkaline aqueous solution, makes Na in the whole solution 2 O / Al 2 o 3 The molar ratio was 1.5 to obtain a sodium aluminate solution.

[0035] Preparation of Part2 liquid water glass

[0036] 4A zeolite dilute mother liquor is evaporated to make Na 2 The O concentration reaches 3mol / l, according to the Na of the evaporated mother liquor 2 O concentration, the amount of quartz...

Embodiment 3

[0041] Preparation of Part1 Sodium Aluminate Solution

[0042] Take the waste alumina in the alumina industry, and it mainly contains the following components after testing: 82%Al 2 o 3 , 5% silica, 5% calcium oxide and 2% iron, according to Al in alumina waste 2 o 3 content, according to Na 2 O, Al 2 o 3 Add soda ash at a molar ratio of 1.5, mix well, and bake at 800°C through a rotary kiln. The roasting time is controlled within 1h by the number of revolutions of the rotary kiln and the amount of feeding, and the roasted materials are used with Na 2 O concentration is 100g / L the stripping of alkaline aqueous solution, makes the Na in the whole solution 2 O / Al 2 o 3 The molar ratio is 2 to obtain a sodium aluminate solution.

[0043] Preparation of Part2 liquid water glass

[0044] 4A zeolite dilute mother liquor is evaporated to make Na 2 The O concentration reaches 5mol / l, according to the Na of the evaporated mother liquor 2 O concentration, the addition amoun...

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Abstract

The invention relates to a method for producing 4A zeolite by using waste alumina and quartz sand. The method can use waste alumina, quartz sand and soda ash with wide sources and low price as raw materials, thereby reducing the production cost. At the same time, it avoids the transportation problem of liquid dangerous goods and reduces the evaporation load of the system, so as to achieve the purpose of high and stable production, cost reduction and efficiency increase.

Description

technical field [0001] The invention relates to a method for producing 4A zeolite, in particular to a method for producing 4A zeolite by utilizing waste alumina and quartz sand. Background technique [0002] At present, the hydrothermal synthesis method commonly used in industry is used to produce 4A zeolite molecular sieve. The aluminum source usually used is bauxite or aluminum hydroxide, and the sodium aluminate solution obtained by dissolving with liquid alkali under certain conditions, and the silicon source is solid sodium silicate. Liquid water glass obtained by melting at high temperature. After the sodium aluminate solution and water glass are cooled, they are slurried at a low temperature according to a certain ratio. After adding a guiding agent, they are aged for a period of time, and then crystallized after heating up to obtain a qualified 4A zeolite molecular sieve product. This method of hydrothermally synthesizing 4A molecular sieve requires consumption of 0...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B39/14
Inventor 刘新权
Owner LUOYANG TIANPING MOLECULAR SIEVE
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