Method for extracting high-purity scandium oxide from titanium dioxide waste acid and Bayer-process red mud by virtue of high-temperature acid leaching

A technology of titanium dioxide waste acid and scandium oxide, which is applied in the direction of improving process efficiency, can solve problems such as inability to perform long-term operation, and achieve the effect of reducing the cost of scandium extraction

Inactive Publication Date: 2014-10-29
GUANGXI BAIHE CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, whether scandium is recovered from Bayer process red mud or scandium is recovered from titanium white waste acid, the process requires reasonable cost and the final environmental protection problem of waste acid or red mud needs to be solved, otherwise it cannot be carried out in industrial applications or long-running

Method used

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  • Method for extracting high-purity scandium oxide from titanium dioxide waste acid and Bayer-process red mud by virtue of high-temperature acid leaching

Examples

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Effect test

Embodiment 1

[0032] at 1m 3 Add 200L mixing water into the reaction tank, start mechanical stirring and gradually add 100kg of powdery Bayer process red mud, continue stirring for 1 hour after adding, then heat up, add acetic acid steam when the material liquid reaches 85°C, and stir for a period of time Finally, add 300 liters of titanium white waste acid at a rate of 5 liters per minute, continue to stir and react for 50 minutes, then cool, and filter when the temperature of the feed liquid is lower than 80°C. After the filter residue is fully washed, it is sent to the residue yard for stacking, and the filtrate is sent to the scandium extraction process. The filtrate containing scandium is extracted and back-extracted. After the stripped residue is dissolved, it is hydrolyzed to remove titanium at 100°C for 2 hours. ℃, adding oxalic acid for precipitation, adding water to the precipitate and then calcining at 850 ℃ to obtain scandium trioxide with a purity of 93.6%. Dissolve scandium ...

Embodiment 2

[0034] at 1m 3 Add 250L mixing water into the reaction tank, start mechanical stirring and gradually add 100kg of powdery Bayer process red mud, continue stirring for 1 hour after adding, then heat up, add additive N when the feed liquid reaches 90°C, and stir for a period of time Finally, add 300 liters of titanium white waste acid at a rate of 6 liters per minute, continue to stir and react for 50 minutes, then cool, and filter when the temperature of the feed liquid is lower than 80°C. After the filter residue is fully washed, it is sent to the residue yard for stacking, and the filtrate is sent to the scandium extraction process. The filtrate containing scandium is extracted and back-extracted. After the stripped residue is dissolved, it is hydrolyzed to remove titanium at 102°C for 2 hours. ℃, add oxalic acid for precipitation, add water to the precipitate and then calcinate at 850 ℃ to obtain scandium trioxide with a purity of 94.3%. Dissolve scandium trioxide with a p...

Embodiment 3

[0036] at 1m 3Add 250L of sizing water into the reaction tank, start the mechanical stirring and gradually add 100kg of powdery Bayer process red mud, continue to stir for 1 hour after adding, then heat up, add additive N when the feed liquid reaches 90 ° C, and stir for a period of time After that, 320 liters of titanium dioxide waste acid was added at a rate of 5.5 liters / minute, and the reaction was continued for 55 minutes with stirring, and then cooled. When the temperature of the feed liquid was lower than 80°C, filtration was performed. The filter residue is fully washed and then sent to the slag yard for stacking, and the filtrate is sent to the scandium extraction process. The scandium-containing filtrate was extracted and back-extracted. After the back-extraction residue was dissolved, the titanium was removed by water at 102 °C for 2 hours. After filtration, the filtrate was subjected to secondary extraction, washed to remove impurities, and then back-extracted. ℃ ...

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Abstract

The invention relates to a method for extracting high-purity scandium oxide from titanium dioxide waste acid and Bayer-process red mud by virtue of high-temperature acid leaching. The method comprises the following steps of firstly preparing red mud produced by the Bayer process into red mud slurry at a room temperature, and then raising the temperature by heating and carrying out acid leaching, filtering, further processing leaching slag and sending to a slag field for stockpiling; extracting acid leaching filtrate with an organic phase, carrying out back-extraction with a lye, dissolving with an acid, hydrolyzing, performing secondary extraction, removing impurities, carrying out secondary back-extraction, dissolving with hydrochloric acid, precipitating with oxalic acid and calcining scandium oxalate to obtain scandium oxide, dissolving scandium oxide with hydrochloric acid again, adding potassium sulfate, sodium carbonate to further remove impurities, adding a solution of oxalic acid, precipitating, washing obtained scandium oxalate, drying and calcining to obtain the high-purity scandium oxide product. According to the method, titanium dioxide waste acid and Bayer-process red mud are conjunctively treated, wastes are treated with processing of wastes, wastes are changed into treasure and the comprehensive recycling of titanium dioxide waste acid and Bayer-process red mud is achieved.

Description

technical field [0001] The invention relates to a process for extracting high-purity scandium oxide from titanium white waste acid and Bayer process red mud by high-temperature acid leaching, and belongs to the technical field of comprehensive utilization of industrial waste liquid and slag and chemical metallurgy. Background technique [0002] Scandium is known as a strategic element in the new century. It is widely used in the fields of national defense, aerospace, nuclear technology, laser, electronics, metallurgy, chemical industry, glass, computer power supply, superconductivity and medicine, but scandium resources on the earth are limited. [0003] At present, my country has an annual production capacity of about 10 million tons of titanium dioxide, and most titanium dioxide manufacturers use the traditional production process of sulfuric acid method, and produce 1 ton of titanium dioxide to produce titanium dioxide waste acid with a concentration of 15-20%6 ~8 tons, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B7/00C22B59/00
CPCY02P10/20
Inventor 兰红春杨明莫绍贞卢劲草农亨李勇黄家富
Owner GUANGXI BAIHE CHEM CO LTD
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