Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for recovering aluminium in aluminium ash by low-temperature alkaline smelting

A technology for recycling aluminum and low temperature, which is applied to the removal of alumina/hydroxide and solid waste, etc. It can solve the problems of not maximizing the value of aluminum resources, and achieve stable product quality, short process flow and simple operation Effect

Inactive Publication Date: 2011-02-16
CENT SOUTH UNIV
View PDF5 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The final product is anhydrous sodium aluminate crystals, which are used in the chemical industry, failing to maximize the value of aluminum resources

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Method for recovering aluminium in aluminium ash by low-temperature alkaline smelting
  • Method for recovering aluminium in aluminium ash by low-temperature alkaline smelting
  • Method for recovering aluminium in aluminium ash by low-temperature alkaline smelting

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] (1) Take 50g of pulverized aluminum ash and press 1 : Mix evenly at a mass ratio of 1.0, melt at 300°C for 150 minutes, NaOH and NaNO in the melting agent 3 The weight ratio is 1:0.5;

[0016] (2) After pulverizing the smelted product, the solid-liquid mass ratio of the smelted product to water is 1 : 3 Add the smelted product into pure water, soak and react for 60min at a stirring speed of 500r / min;

[0017] (3) Filtrate the solution, and decompose the seed crystal at a temperature of 40°C, a stirring speed of 200r / min, a seed crystal coefficient of 1, and a reaction time of 72h; the Al(OH) obtained after the seed crystal decomposition 3 α-Al was obtained after calcination at 1200℃ for 60min 2 o 3 ; The aluminum recovery rate is 95.73%, and the main phase composition in the product is: Al 2 o 3 98.5%, SiO 2 0.02%, Fe 2 o 3 0.01%, others 1.47%.

[0018] The composition (analyzed by XRF) of the aluminum ash used in this embodiment is as shown in Table 1:

...

Embodiment 2

[0022] (1) Take 50g of pulverized aluminum ash and mix them evenly with the melting agent at a mass ratio of 1:1.7, and smelt at 500°C for 30 minutes. NaOH and NaNO in the melting agent 3 The weight ratio is 1:0.9;

[0023] (2) After pulverizing the smelted product, according to the solid-to-liquid ratio (mass ratio) of 1:20, soak and react in pure water for 150min at a stirring speed of 800r / min;

[0024] (3) Filtrate the solution, and decompose the seed crystal under the conditions of 30°C, stirring speed 200r / min, seed crystal coefficient 1, and reaction time 84h; the Al(OH) obtained after the seed crystal decomposition 3 α-Al was obtained after calcination at 1200℃ for 60min 2 o 3 ; Aluminum recovery rate: 97.31%, the phase composition in the product is: Al 2 o 3 98.9%, SiO 2 0.01%, Fe 2 o 3 0.01%, others 1.08%.

Embodiment 3

[0026] (1) Mix 50g of pulverized aluminum ash with the melting agent at a mass ratio of 1:2.1, and melt at 650°C for 90 minutes. NaOH and NaOH in the melting agent 2 o 2 The weight ratio is 1:1.1;

[0027] (2) After pulverizing the smelted product, according to the solid-to-liquid ratio (mass ratio) of 1:15, soak it in pure water at a stirring speed of 300r / min for 30min;

[0028] (3) The solution obtained by filtration was decomposed at 60°C, the stirring speed was 200r / min, the seed crystal coefficient was 1, and the reaction time was 48h; the Al(OH) 3 α-Al was obtained after calcination at 1200℃ for 60min 2 o 3 ; Aluminum recovery rate: 93.88%, the phase composition in the product is: Al 2 o 3 98.3%, SiO 2 0.05%, Fe 2 o 3 0.03%, others 1.62%.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A method for recovering aluminium in aluminium ash by low-temperature alkaline smelting comprises the following steps: mixing the aluminium ash with a fusion agent according to the mass ratio of 1:0.5-1:2.1 and smelting the mixture at 300-800 DEG C; soaking the smelted product in water according to the smelted product / water ratio of 1:1-1:20 and stirring the smelted product to react for 20-180min; after filtration, carrying out seed precipitation for 48-84h under the following conditions: the temperature is 30-60 DEG C, the stirring speed is 200r / min and the seed coefficient is 1; and roasting the obtained Al(OH)3 at 1200 DEG C for 60min, thus obtaining alpha-Al2O3. The method can effectively extract the aluminium resources, solves the problem of environmental pollution of the aluminium ash, is environment-friendly in production process, greatly reduces the energy consumption compared with the traditional processes and is short in process flow, stable in product quality and simple to operate.

Description

technical field [0001] The invention relates to a method for recovering aluminum in aluminum ash by a low-temperature alkaline smelting method. Background technique [0002] CN 1673084A discloses a method for producing alumina from waste aluminum ash, which first screens and magnetically separates the aluminum ash. Then dehydrate until the water content of the aluminum ash is <15%; add Na to the dehydrated aluminum ash 2 CO 3 Stir the solution, sinter the slurry at 1100-1200°C, add water to the cooled clinker and grind to 120-150 mesh, heat and leach the crude solution of sodium aluminate, leaching at 80-100°C for 1-2h, and obtain aluminum after filtration Sodium acid solution, and then use the carbon method to prepare alumina. This method technological process is long, equipment is complicated, and product quality is not good. CN 1927718A discloses a method for preparing sodium aluminate from waste aluminum ashes. Firstly, the waste aluminum ashes are deaminized and...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02B09B3/00
Inventor 田庆华郭学益李菲
Owner CENT SOUTH UNIV