CN104512918B

CN104512918B - A kind of mother liquor floating material prepares the method for activated alumina

Info

Publication number: CN104512918B
Application number: CN201310450797.0A
Authority: CN
Inventors: 张正勇; 陈国华; 李志国
Original assignee: Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Current assignee: Shenyang Aluminum and Magnesium Engineering and Research Institute Co Ltd
Priority date: 2013-09-27
Filing date: 2013-09-27
Publication date: 2016-12-07
Anticipated expiration: 2033-09-27
Also published as: CN104512918A

Abstract

The present invention discloses a kind of method that mother liquor floating material prepares activated alumina, comprise the steps: (1) float of seed mother liquor through leaf filter reclaim after wash with water 23 times the most standby；(2) dried floating material is added directly into fast dewatering operation；(3) carry out pelletize after cooling, add the boehmite of the floating material quality 10 20% after fast dewatering, mixture is prepared as the diameter spheroidal particle in 5 10mm sizes；(4) granule made is put in baking oven it is dried；(5) being put in 600 900 DEG C of Muffle furnaces by the granule being completely dried and carry out calcining 26 hours, control by stages heating rate obtains active alumina product.Compared with the prior art the present invention, has technological process short, simple to operate, can effectively utilize the floating material in seed precipitation solution, avoid it to enter the evaporization process follow-up flow process of impact, reduce evaporation and scab, improve operation rate, increase alumina producer economic benefit.

Description

A kind of mother liquor floating material prepares the method for activated alumina

Technical field

The present invention relates to a kind of method that mother liquor floating material prepares activated alumina, particularly relate to one Plant the method that in aluminum oxide production process, float of seed mother liquor prepares activated alumina.

Background technology

In aluminum oxide production process, generally use vertical-disk filter and filter seed precipitation solution, then Seed precipitation solution send evaporization process after heat exchange, will produce floating material in the process, namely Suspend the non-molten granule of small solid in the solution, and its main component is small aluminium hydroxide Granule.It is≤1g/L that float of seed mother liquor content is commonly designed requirement, but in actual production Impact due to factors such as filter cloth breakages, it is difficult to reach design standard, thus result in a large amount of Floating material circulate on stream, the most not only add the power cost of various equipment, maintenance Expense and spare part expense, and be easily generated during floating material enters into vaporizer in mother solution and scab, manage The a series of harmful effect of degradation under road blocking, heat transfer coefficient, shortens the use cycle of vaporizer, Reduce the production capacity of vaporizer simultaneously, increase the steam consumption, cause unnecessary energy waste. Floating material after present stage recovery joins in seed precipitation tank generally as essence kind, due in floating material Aluminum hydroxide particles the least, the molecule do not grown up during seeded precipitation will be again In secondary entrance circulation process, easily cause floating material secondary and exceed standard, be unfavorable for producing stable operation.

Activated alumina is a kind of porous, has the solid matter of high degree of dispersion, has the highest ratio Surface area, its microcellular structure has the characteristic required by catalytic action, such as absorption property, surface Acidity and heat stability etc..Activated alumina industrially has purposes widely, is mainly used as Desiccant, adsorbent, catalyst and catalyst carrier etc..Prepared by existing activated alumina Method has: carbonizatin method, acid system, alkaline process and sol-gal process etc., the most typically makes Being raw material by aluminium salt, cost of material is higher, additionally needs to be finely ground to below 325 mesh, increases Production cost and energy consumption.

Summary of the invention

This patent is that the one proposed to solve the problems referred to above utilizes float of seed mother liquor The method preparing activated alumina, it is low that the method has cost of material, decreases conventional preparation side Fine grinding operation in method, production technology is simple, and production cost is low, it is easy to industrialization promotion.

For reaching above-mentioned purpose, the present invention is achieved in that

A kind of mother liquor floating material prepares the method for activated alumina, it is characterised in that include walking as follows Rapid: (1) float of seed mother liquor washes with water 2-3 time after leaf filter reclaims, and thoroughly removes Residual alkali in floating material and other soluble impurities, the most standby；(2) will be dried After floating material be added directly into fast dewatering operation, in the heat of the high velocity turbulent flow of 600-900 DEG C Air-flow realizes fast dewatering；(3) carry out pelletize after cooling, add floating after fast dewatering The boehmite of trip material amount 10-20%, to improve pore volume and specific surface area, then and soon After floating material after speed dehydration is sufficiently mixed, mixture is prepared as diameter in 5-10mm size Spheroidal particle；(4) granule made is put in baking oven it is dried, thoroughly remove particle-removing The moisture of middle residual；(5) granule being completely dried is put in Muffle furnace 600-900 DEG C of temperature Carry out calcining 2-6 hour, control by stages heating rate under degree, prevent bead efflorescence, then Naturally cool to room temperature, obtain active alumina product.

The method of described control by stages heating rate is: when 0-400 DEG C: control heating rate It is 15 DEG C/min, during more than 400 DEG C: controlling heating rate is 30 DEG C/min, treats in temperature It is raised to insulation 2-6 hour during assigned temperature, after cooling, naturally cools to room temperature.

Compared with the prior art the present invention, has technological process short, simple to operate, can be effectively sharp With the floating material in seed precipitation solution, avoid it to enter the evaporization process follow-up flow process of impact, reduce and steam Send out and scab, improve operation rate, increase alumina producer economic benefit.

Detailed description of the invention

Embodiment 1

First weigh 100g floating material, wash away attached alkali with distilled water, at 105 DEG C, be dried 2 Hour standby, then in the high-temperature hot air-flow of 600 DEG C, rapid draing obtains the fast shedding of aluminium oxide； Add the expanding agent boehmite of the floating material quality 15% after fast dewatering after cooling, fill The diameter spheroidal particle in 5-10mm size is made after dividing mixing；The spheroidal particle made is existed It is dried 3 hours at 105 DEG C in baking oven, thoroughly removes the moisture of residual in particle-removing；By completely dry Dry granule is put in 700 DEG C of Muffle furnaces and is carried out calcining 4 hours, when 0-400 DEG C: control to rise Temperature speed is 15 DEG C/min, it is achieved heats up at a slow speed, prevents bead crack, when 400-700 DEG C: Controlling heating rate is 30 DEG C/min, it is achieved be rapidly heated, and protects when temperature rises to 700 DEG C Temperature 5 hours, naturally cools to room temperature, prepares activated alumina after cooling.

Embodiment 2

First weigh 100g floating material, wash away attached alkali with distilled water, at 105 DEG C, be dried 2 Hour standby, then in the high-temperature hot air-flow of 800 DEG C, rapid draing obtains the fast shedding of aluminium oxide； Add the expanding agent boehmite of the floating material quality 20% after fast dewatering after cooling, fill The diameter spheroidal particle in 5-10mm size is made after dividing mixing；The spheroidal particle made is existed It is dried 3 hours at 105 DEG C in baking oven, thoroughly removes the moisture of residual in particle-removing；By completely dry Dry granule is put in 850 DEG C of Muffle furnaces and is carried out calcining 4 hours, when 0-400 DEG C: control to rise Temperature speed is 15 DEG C/min, it is achieved heats up at a slow speed, prevents bead crack, when 400-850 DEG C: Controlling heating rate is 30 DEG C/min, it is achieved be rapidly heated, and protects when temperature rises to 850 DEG C Temperature 4 hours, naturally cools to room temperature, prepares activated alumina after cooling.

Embodiment 3

First weigh 100g floating material, wash away attached alkali with distilled water, at 105 DEG C, be dried 2 Hour standby, then in the high-temperature hot air-flow of 900 DEG C, rapid draing obtains the fast shedding of aluminium oxide； Add the expanding agent boehmite of the floating material quality 10% after fast dewatering after cooling, fill The diameter spheroidal particle in 5-10mm size is made after dividing mixing；The spheroidal particle made is existed It is dried 3 hours at 105 DEG C in baking oven, thoroughly removes the moisture of residual in particle-removing；By completely dry Dry granule is put in 900 DEG C of Muffle furnaces and is carried out calcining 4 hours, when 0-400 DEG C: control to rise Temperature speed is 15 DEG C/min, it is achieved heats up at a slow speed, prevents bead crack, when 400-900 DEG C: Controlling heating rate is 30 DEG C/min, it is achieved be rapidly heated, and protects when temperature rises to 900 DEG C Temperature 3.5 hours, naturally cools to room temperature, prepares activated alumina after cooling.

Claims

1. the method that a mother liquor floating material prepares activated alumina, it is characterised in that include as Lower step: (1) float of seed mother liquor washes with water 2-3 time, thoroughly after leaf filter reclaims Remove the residual alkali in floating material and other soluble impurities, the most standby；(2) will Dried floating material is added directly into fast dewatering operation, at the high velocity turbulent flow of 600-900 DEG C Thermal current in realize fast dewatering；(3) pelletize is carried out after cooling, after adding fast dewatering The boehmite of floating material quality 10-20%, then with fast dewatering after floating material fill After dividing mixing, mixture is prepared as the diameter spheroidal particle in 5-10mm size；(4) will The granule made is put in baking oven and is dried, and thoroughly removes the moisture of residual in particle-removing；(5) The granule being completely dried is put in 600-900 DEG C of Muffle furnace and carry out calcining 2-6 hour, sublevel Section controls heating rate, prevents bead efflorescence, then naturally cools to room temperature, obtain active oxygen Change aluminum product；The method of described control by stages heating rate is: when 0-400 DEG C: control to rise Temperature speed is 15 DEG C/min, heats up at a slow speed, prevents bead crack；During more than 400 DEG C: control Heating rate is 30 DEG C/min, is incubated 2-6 hour, fall when temperature rises to 600-900 DEG C Room temperature is naturally cooled to after temperature.