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A kind of bleaching method of kaolin

A technology of kaolin and mass fraction, applied in the field of bleaching, can solve the problems of low acid use efficiency, complicated process, low removal rate, etc., and achieve the effect of reducing the use of sulfuric acid, simple process and high whiteness

Active Publication Date: 2017-10-17
LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The removal rate of other dyeing impurity metal ions is low under this condition
Moreover, the process is complicated and the use efficiency of acid is low

Method used

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  • A kind of bleaching method of kaolin
  • A kind of bleaching method of kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] a, 100mL of ore pulp (comprising the ion of Fe, Ti, V, Cr, Cu and / or Mn element in the ore pulp) is placed in the first container, the mass fraction that adds 10mL is 8% hydrogen peroxide solution, again 8 mL of 4-2-pyridylazoresorcinol solution with a mass fraction of 8% was added, stirred continuously, and reacted at 25° C. for 35 min. Taking iron ions as an example, the following chemical reactions occur:

[0022] 2Fe 2+ +H 2 o 2 =2Fe 3+ +2OH -

[0023] PAR+Fe 3+ =[PAR-Fe(III)] 3+

[0024] b. Transfer the contents of the first container to the second container, and a shut-off valve is provided at the bottom of the second container. Add 50mL of chloroform and 12mL of 1.5% polyacrylamide solution to the pulp in the second container, stir for 8min, and then let stand for 15min. After standing for stratification, release the solid matter deposited in the lower layer through the stop valve; again Put the solid matter in a third container with a shut-off valve at...

Embodiment 2

[0026] a, 100mL of ore pulp (comprising the ion of Fe, Ti, V, Cr, Cu and / or Mn element in the ore pulp) is placed in the first container, the mass fraction that adds 8mL is 10% hydrogen peroxide solution, again Add 5 mL of 4-2-pyridylazoresorcinol solution with a mass fraction of 10%, stir continuously, and react at 15° C. for 40 min.

[0027] b. Transfer the contents of the first container to the second container, and a shut-off valve is provided at the bottom of the second container. Add 40mL of carbon tetrachloride and 15mL of polyacrylamide solution with a mass fraction of 2% to the slurry in the second container, stir for 5min, and then let stand for 20min. Substance: Place the solid substance in the third container with a stop valve at the bottom again, add 40mL carbon tetrachloride and 15mL polyacrylamide solution with a mass fraction of 2% to the third container, stir for 5min, and then let it stand After standing for 20 minutes, release the solid matter deposited in ...

Embodiment 3

[0029] a, 100mL of ore pulp (comprising the ion of Fe, Ti, V, Cr, Cu and / or Mn element in the ore pulp) is placed in the first container, the mass fraction that adds 12mL is 5% hydrogen peroxide solution, again Add 10 mL of 5% 4-2-pyridylazoresorcinol solution, stir continuously, and react at 30° C. for 30 min.

[0030] b. Transfer the contents of the first container to the second container, and a shut-off valve is provided at the bottom of the second container. Add 60mL of petroleum ether and 10mL of polyacrylamide solution with a mass fraction of 1% to the pulp in the second container, stir for 10min, and then let stand for 10min. After standing for stratification, release the solid matter deposited in the lower layer through the stop valve; Put the solid matter again in the third container with a shut-off valve at the bottom, add 60mL of petroleum ether and 10mL of polyacrylamide solution with a mass fraction of 1% to the third container, stir for 10min, and then let it sta...

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Abstract

The invention discloses a method for bleaching kaolin. The method comprises the following steps: a step a of placing kaolin pulp in a container, adding 8-12 ml of hydrogen dioxide solution with a mass percentage of 5-10% into every 100 ml of pulp, and adding 5-10 ml of 4-2-pyridylazo-resorcinol solution with a mass percentage of 5-10% into every 100 ml of pulp, and reacting for 30-40 min at 15-30 DEG C; a step b of using an organic solvent and polyacrylamide solution to extract solid matter in the container many times, performing solid-liquid separation, and obtaining solid matter which is bleached kaolin. The method has the advantages that dyed impurity metal ions are separated completely, and the kaolin whiteness is high; in the separation process, sulfuric acid used is reduced, so that a neutralizing process does not need to be performed, production links are reduced, the production efficiency is improved, and no waste is generate; 4 the reaction is performed at normal temperature and normal pressure, and the process is simple; and 5 the production cost is reduced.

Description

technical field [0001] The invention relates to a bleaching method, in particular to a kaolin bleaching method. Background technique [0002] Whiteness is the main technical index of kaolin products. Kaolin in nature contains dyeing impurity metal elements, such as Fe, Ti, V, Cr, Cu, Mn and so on. The whiteness cannot meet the requirements of the product, and whitening treatment is required. In industry, the ore pulp is often whitened by magnetic separation, and then chemically bleached to achieve higher whiteness. Chemical bleaching is to add sulfuric acid, hydrosulfite and other chemical reagents to kaolin to reduce the ferric iron of kaolin to ferrous iron and separate it to achieve the purpose of whitening. Since the reaction is carried out in an acidic medium, a large amount of harmful ions such as sulfuric acid and ferrous ions will remain in the bleached pulp, which needs to be neutralized and iron removed before it can be reused. That is, adding lime solution and...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/80
Inventor 邸万山
Owner LIAONING PETROCCHEM VOCATIONAL & TECH COLLEGE