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Method for recovering al and co from waste aluminum-based catalyst sodium roasting water leaching slag

A catalyst and aluminum-based technology, applied in the direction of improving process efficiency, can solve the problems of cobalt and aluminum that are difficult to recycle, cobalt has not been recovered, and the leaching rate of aluminum and cobalt is low, so as to promote leaching and recovery without high-pressure equipment and equipment less demanding effect

Active Publication Date: 2021-02-12
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Cobalt aluminate is a stable compound with a spinel structure. Conventional acid leaching and alkali leaching have low leaching rates of aluminum and cobalt. It is difficult to recover cobalt and aluminum by wet methods.
If the recovery of Al is to be achieved through the sodium roasting method, the roasting temperature needs to be increased to 1000-1200°C, so that sodium carbonate can form soluble sodium aluminate with alumina, which not only increases energy consumption, but also keeps cobalt It has not been recovered, and the resulting water leaching residue is listed as hazardous waste by the state because it contains heavy metal elements such as cobalt

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Step 1. Grinding the raw material to above 200 mesh.

[0022] Step 2, adding a sodium hydroxide solution with a mass concentration of 75% into a normal-pressure reactor and heating to 150°C.

[0023] Step 3, the raw material in step 1 is added in the reactor of step 2, and its alkali-mineral ratio is 3 (NaOH mass in the solution: raw material mass=3). Turn on the electric stirrer, and carry out the sub-molten salt leaching reaction under the conditions of stirring speed of 600r / min and stirring at constant temperature for 2h.

[0024] Step 4: Dilute the reaction product obtained in step 3 and separate the liquid and solid to obtain a cobalt-containing leaching residue and an aluminum-containing leaching solution. The aluminum leaching rate is 74.02%, and the aluminum-containing leaching solution can be crystallized to obtain a crystallization mother liquor and crude sodium aluminate Crystallization, the crystallization mother liquor can be returned to the sub-molten sa...

Embodiment 2

[0027] Step 1, grinding the water leached slag raw material to more than 200 mesh;

[0028] Step 2, adding a sodium hydroxide solution with a mass concentration of 80% into an atmospheric pressure reactor and heating to 190°C;

[0029] Step 3, add the water leaching slag raw material ground in step 1 into the reaction kettle of step 2, the alkali-mineral ratio is 4, turn on the electric stirrer, and carry out sub Molten salt leaching reaction;

[0030] Step 4: dilute the reaction product obtained in step 3 with water, and separate liquid and solid to obtain cobalt-containing leaching residue and aluminum-containing leaching solution. The aluminum leaching rate is 92.28%, and the aluminum-containing leaching solution can be crystallized to obtain crystalline mother liquor and crude aluminate Sodium crystallization, crystallization mother liquor can be returned to sub-molten salt leaching reaction, crude sodium aluminate crystallization can be re-dissolved and seeded to obtain ...

Embodiment 3

[0033] Step 1. Grinding the raw material to above 200 mesh.

[0034] Step 2, adding a sodium hydroxide solution with a mass concentration of 85% into a normal-pressure reactor and heating to 180°C.

[0035] Step 3, adding the water leached slag raw material ground in step 1 into the reaction kettle in step 2, the alkali-mineral ratio is 5. Turn on the electric stirrer, and carry out the sub-molten salt leaching reaction under the conditions of stirring speed of 600r / min and stirring at constant temperature for 2h.

[0036] Step 4: Dilute the reaction product obtained in step 3 and separate the liquid and solid to obtain cobalt-containing leaching slag and aluminum-containing leaching solution. The aluminum leaching rate is 93.80%, and the aluminum-containing leaching solution can be crystallized to obtain crystallization mother liquor and crude sodium aluminate Crystallization, the crystallization mother liquor can be returned to the sub-molten salt leaching reaction, and the...

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Abstract

The invention relates to a method for recovering Al and Co from sodium-calcined and roasted water leaching slag of waste aluminum-based catalysts, which efficiently recycles valuable metals Al and Co as main components in the water leaching slag, and reduces environmental pollution caused by waste slag. In the present invention, the reaction temperature of the water leaching slag is reduced from the current 1000-1200°C to 150-200°C, the temperature drop is significant, the low-temperature recovery of aluminum is realized, and the energy consumption is greatly reduced; the reaction medium sodium hydroxide is recycled, reducing the Wastewater discharge; low equipment requirements, no need for high-pressure equipment, low investment; CoMoO is realized at low temperature 4 The destruction of the spinel structure effectively promotes the leaching and recovery of the subsequent element Co, and the leaching rate of Al and Co can reach up to more than 95%.

Description

technical field [0001] The invention relates to a method for recovering Al and Co from sodium-calcined and roasted water leaching slag of waste aluminum-based catalysts, which efficiently recycles valuable metals Al and Co as main components in the water leaching slag, and reduces environmental pollution caused by waste slag. Background technique [0002] Sodium roasting-water immersion technology is currently the most widely used waste catalyst recovery method. This method is to mix the waste catalyst with sodium carbonate and put it into a rotary kiln for roasting at 600-900°C. The roasted product is dissolved by water immersion. The soluble molybdate and vanadate generated during the roasting process make molybdenum and vanadium enter the solution, and valuable metals such as aluminum and cobalt remain in the water leaching residue. Aluminum and cobalt are insoluble because cobalt and aluminum in the spent catalyst are easily formed into cobalt aluminate at a temperature ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B7/00C22B21/00C22B23/00
CPCC22B7/007C22B7/008C22B7/009C22B21/003C22B23/043C22B23/0446Y02P10/20
Inventor 廖春发谢岁曾颜亮邹耕王旭姜平国焦芸芬
Owner JIANGXI UNIV OF SCI & TECH