Method for extracting white carbon black from mine tailing

A technology for silica and tailings, applied in the chemical industry, can solve the problems of high process cost, difficult extraction, and failure to make great progress, and achieve the effects of simple and scientific process, cost reduction, and strong industrial application value.

Inactive Publication Date: 2013-10-23
INNER MONGOLIA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Baiyan Obo Mine is a typical paragenetic ore. The ore is not only rich in rare earth, iron, niobium, fluorite and other resources, but also rich in a large amount of silicon. With the selection of rare earth, iron and other resources, silicon has been further refined. However, because the silicon in the Baiyun Obo tailings mainly occurs in silicate minerals, it is difficult to extract it, and no major progress has been made so far.
[0004] Predecessors have also done a lot of research on the extraction of silicon from iron tailings. For example, the patent application number 201110071373 studies the extraction method of silicon from iron tailings, but it has not been used in actual production. From the perspective of comprehensive utilization of resources, the process cost is too high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Roasting with alkali and molten salt: Take 100g of Baiyan Obo tailings, add 200g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;

[0022] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;

[0023] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;

[0024] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 71.25%.

Embodiment 2

[0026] (1) Roasting with alkali and molten salt: Take 100g of Baiyun Obo tailings, add 240g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;

[0027] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;

[0028] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;

[0029] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 74.74%.

Embodiment 3

[0031] (1) Roasting with alkali and molten salt: Take 100g of Baiyun Obo tailings, add 260g of sodium hydroxide and 100g of molten salt and mix well, then roast at 700°C for 2 hours;

[0032] (2) Water immersion: Use ordinary industrial water to stir and water immerse the roasted and decomposed minerals. The leaching temperature is 85°C and the water immersion time is 0.25h;

[0033] (3) Filtration: after immersion in water, filter and wash until the filtrate is neutral to obtain washing liquid and washing residue, and the washing liquid is a solution containing sodium silicate;

[0034] (4) Add hydrochloric acid to adjust the pH: the concentration of hydrochloric acid is 2.4mol / L, and the pH is adjusted to about 7. In a water bath at 95°C and stirred at 500r / min, white carbon black is prepared by precipitation method, and the prepared white carbon black is filtered and washed with water. , drying, the recovery rate of silicon is 78.43%.

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Abstract

The invention discloses method for extracting white carbon black from mine tailing. According to the invention, Bayan Obo mine tailing is adopted as a raw material for leaching and extracting silicon for preparing white carbon black. The invention belongs to the field of chemical engineering. According to the invention, grinded mine tailing and an alkali metal hydroxide are mixed according to a ratio of 1.0:2.0-3.0:1.0; the mixture is roasted under a temperature of 600-750 DEG C; the roasted mine tailings is soaked by using water, and is washed to neutral; the washing liquid is adopted as a mother liquor, and white carbon black is prepared with a precipitation method. The process provided by the invention is simple and scientific. With the method, silicon can be leached and extracted from Bayan Obo mine tailing highly efficiently, and can be used for preparing white carbon black. A silicon leaching rate is no lower than 75%. The prepared white carbon black satisfies a national standard. Also, other byproducts can be recovered during the process. Therefore, with the method, Bayan Obo mine tailing can be comprehensively utilized.

Description

technical field [0001] The invention relates to a method for extracting white carbon black from tailings, which belongs to the field of chemical industry. Background technique [0002] The traditional sources of precipitated silica are mainly sodium silicate, silicon tetrachloride, and ethyl orthosilicate. Except for sodium silicate, the other costs are very high. The new method uses cheap non-metallic minerals as the silicon source, which greatly reduces the production cost of white carbon black. The main raw materials are wollastonite, opal, halloysite, olivine, snakebite, kaolin, hard kaolin, coal gangue, fly ash and so on. As the patent application number CN93104590.8 reports the method of reclaiming silicon from wollastonite to produce white carbon black, the patent application number CN86107192 and the patent application number CN94111512.7 report the extraction of silicon from rice husk Process for preparing white carbon black. [0003] In order to meet the increas...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 李梅高凯张栋梁柳召刚周富强郭财胜
Owner INNER MONGOLIA UNIV OF SCI & TECH
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