Method for preparation of activated alumina from suspended solids in mother liquor

A technology of activated alumina and floating matter, which is applied in the preparation of alumina/hydroxide, etc., can solve the problems of increased production cost, energy consumption, and high raw material cost, so as to improve equipment operation rate, simple operation, and reduce evaporation scarring Effect

Active Publication Date: 2015-04-15
SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing activated alumina preparation methods include: carbonization method, acid method, alkali method and sol-gel method, etc. In the production process, aluminum salts are generally used as raw materials, and the cost of raw materials is relatively high. In addition, it needs to be finely ground to below 325 mesh , increasing production costs and energy consumption

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0010] First weigh 100g of floating matter, wash with distilled water to remove the attached alkali, dry at 105°C for 2 hours for use, and then quickly dry in a high temperature hot air stream at 600°C to obtain alumina quick de-powdering; after cooling, add the rapidly dehydrated floating matter The pore-expanding agent pseudo-boehmite with a mass of 15% is fully mixed to form spherical particles with a diameter of 5-10mm; the finished spherical particles are dried in an oven at 105°C for 3 hours to completely remove the remaining particles Moisture; put the completely dried particles into a 700℃ muffle furnace for calcination for 4 hours, at 0-400℃: control the heating rate to 15℃ / min to achieve slow heating and prevent cracks in the ball, at 400-700℃ : Control the heating rate to 30°C / min to achieve rapid heating. When the temperature rises to 700°C, keep it for 5 hours, and then cool down to room temperature naturally to prepare activated alumina.

Embodiment 2

[0012] First weigh 100g of floating matter, wash with distilled water to remove the attached alkali, dry at 105°C for 2 hours, and then quickly dry in 800°C high temperature hot air to obtain alumina quick de-powdering; after cooling, add the rapidly dehydrated float 20% by mass of the pore expander pseudo-boehmite, fully mixed into spherical particles with a diameter of 5-10mm; the finished spherical particles are dried in an oven at 105°C for 3 hours to completely remove the remaining particles Moisture; put the completely dried particles into a muffle furnace at 850℃ for 4 hours, at 0-400℃: control the heating rate to 15℃ / min to achieve slow heating and prevent cracks in the ball, at 400-850℃ : Control the heating rate to 30°C / min to achieve rapid heating. When the temperature rises to 850°C, keep it for 4 hours, and then cool to room temperature naturally after cooling to prepare activated alumina.

Embodiment 3

[0014] First weigh 100g of floating matter, wash with distilled water to remove the attached alkali, dry at 105°C for 2 hours, and then quickly dry in 900°C high temperature hot air to obtain alumina quick de-powdering; after cooling, add the rapidly dehydrated float The pore-expanding agent pseudo-boehmite with 10% mass is fully mixed to form spherical particles with a diameter of 5-10mm; the finished spherical particles are dried in an oven at 105°C for 3 hours to completely remove the remaining particles Moisture: Put the completely dried particles into a 900℃ muffle furnace for calcination for 4 hours. At 0-400℃: control the heating rate to 15℃ / min to achieve slow heating and prevent cracks in the ball, at 400-900℃ : Control the heating rate to 30°C / min to achieve rapid heating. When the temperature rises to 900°C, it is kept for 3.5 hours, and after cooling, it is naturally cooled to room temperature to prepare activated alumina.

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Abstract

The invention discloses a method for preparation of activated alumina from suspended solids in mother liquor. The method comprises the steps of: (1) recovering suspended solids in seed precipitation mother liquor by a leaf filter, then conducting washing with water 2-3 times, and performing drying for standby use: (2) adding the dried suspended solids into a rapid dehydration process directly; (3) carrying out granulation after cooling, adding pseudo-boehmite accounting for 10-20% of the mass of the rapidly dehydrated suspended solids, and making the mixture into spherical particles with a diameter of 5-10mm; (4) drying the well made particles into an oven to conduct drying; (5) putting the completely dried particles into a 600-900DEG C muffle furnace to perform calcination for 2-6h, and controlling the heating rate in stages so as to obtain an activated alumina product. Compared with the prior art, the method provided by the invention has the advantages of short process and simple operation, can effectively utilize the suspended solids in the seed precipitation mother liquor, prevents the suspended solids from entering the evaporation process to influence the subsequent process, reduces evaporation and scab formation, improves equipment operation rate, and increases the economic benefits of alumina plants.

Description

Technical field [0001] The invention relates to a method for preparing activated alumina from mother liquor floats, in particular to a method for preparing activated alumina from mother liquor floats during alumina production. Background technique [0002] In the alumina production process, a vertical disc filter is generally used to filter the seed mother liquor, and then the seed mother liquor is sent to the evaporation process after heat exchange. During this process, suspended matter, that is, the tiny solid non-solid suspended in the solution, is produced. Soluble particles, its main component is tiny aluminum hydroxide particles. The content of floating matter in seed mother liquor is usually designed to be ≤1g / L, but in actual production, due to the influence of filter cloth damage and other factors, it is generally difficult to meet the design standard, which causes a large amount of floating matter to circulate in the process, which not only increases The power cost, ma...

Claims

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Application Information

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IPC IPC(8): C01F7/30
CPCC01F7/30
Inventor 张正勇陈国华李志国
Owner SHENYANG ALUMINIUM MAGNESIUM INSTITUTE
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