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Method for deferrization and whitening of palygorskite by using sodium oxalate and hydrochloric acid

A palygorskite and sodium oxalate technology, applied in the material field of the chemical industry, can solve problems such as limited improvement of whiteness, difficult conditions to control, complicated operation, etc., and achieve the effect of simple operation, easy control of conditions, and good bleaching effect

Inactive Publication Date: 2006-12-27
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although this method can remove iron to a certain extent, the operation is complicated and the conditions are difficult to control. Sulfur powder reduction can produce S, which is easy to return to yellow, and is easy to cause environmental pollution.
However, the single use of oxalic acid and some ordinary stirring and heating methods has limited improvement in whiteness.

Method used

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  • Method for deferrization and whitening of palygorskite by using sodium oxalate and hydrochloric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Add palygorskite powder into a beaker, add a certain amount of water and stir evenly to make a 5% original slurry, and let it stand for 2 hours to precipitate large particles of impurities. Take out 70% by volume of the upper layer slurry by the upper layer discharge method, and discard the bottom sediment. Add sodium oxalate to the upper slurry to make the concentration of sodium oxalate 2% by weight; add hydrochloric acid dropwise to make the pH of the slurry ≤ 3, stir evenly, and ultrasonicate for 30 minutes in an ultrasonic instrument to fully refine the palygorskite particles. Then heat and stir at 80° C. for 2 hours, so that the iron ions in the palygorskite are fully dissolved, and complexed with oxalate ions and dissolved in the liquid phase. Stop heating, carry out suction filtration while hot, the filtrate is yellow. Wash with water several times until the filtrate is neutral. The target product is obtained by drying and grinding according to conventional me...

Embodiment 2-8

[0030] Press the preparation flow process of embodiment 1, carry out the experiment according to the experimental conditions listed in the table below,

[0031]

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PUM

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Abstract

The invention discloses a sodium oxalate and alcaine composite deironing whitening method of paligorskite, which comprises the following steps: dispensing paligorskite and water at 1-10% density rate to prepare slurry; stewing for 1-4 h; sedimenting; draining 60-80 percent upper layer slurry through upper layer discharge method; adding sodium oxalate with 0.1-10% weight rate density in the upper layer slurry; dripping alcaine pH value not more than 3; heating to stir upper layer slurry mechanically at 40-100 deg.c; sucking the slurry at the heating time; washing many times until the filtrate displays neutral; drying; grinding to obtain the product.

Description

technical field [0001] The invention relates to a palygorskite sodium oxalate and hydrochloric acid compound iron removal and whitening method, which belongs to the material of the chemical industry [0002] technology field. Background technique [0003] Palygorskite is a natural rod-shaped nanomaterial. Due to its special structure, it is widely used in medicine, chemical industry, building materials and other fields. Because natural palygorskite ore often contains various impurities, such as: quartz, etc., especially ferrous, titanium, organic matter and other colored substances will affect its whiteness, so that the application of palygorskite in high value-added products is limited. [0004] Routine chemical analysis shows that the main color-causing impurities in ores such as palygorskite and zeolite are iron ions. At present, there are mainly the following methods for chemical bleaching of mineral iron removal: [0005] ① Acid leaching method: use hydrogen ions to...

Claims

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Application Information

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IPC IPC(8): C04B41/00C04B41/45
Inventor 方卫民章良
Owner ZHEJIANG UNIV
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