Deironing process for kaolin

A kaolin and process technology, applied in the direction of inorganic chemistry, non-metallic elements, silicon compounds, etc., can solve the problems of less kaolin, low dissolution efficiency of iron impurities, and ineffective removal of iron impurities, so as to improve the efficiency of iron removal, Increased whiteness and high applicability

Active Publication Date: 2020-03-06
漳州市龙华矿产有限公司
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

However, since the content of iron impurities in kaolin mines in various regions is very different, and the dissolution efficiency of iron impurities in acid solution is low, kaolin mines in different regions cannot be obtained after only 40-45 minutes of acidity. less kaolin, the whitene

Method used

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  • Deironing process for kaolin
  • Deironing process for kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1: a kind of kaolin iron removal process comprises the steps:

[0037] Step 1, put the kaolin filter cake in Zhangzhou City into the sulfuric acid pool, and disperse it evenly through the mixer; the sulfuric acid pool in this step is a sulfuric acid solution with pH=1 made of sulfuric acid and water; the kaolin filter cake in this step is authorized The patent notification number is prepared in Example 1 of the kaolin preparation method of CN101798096B.

[0038] Step 2, feed hydrogen peroxide with a mass fraction of 30% into the sulfuric acid pool, the liquid-solid ratio of hydrogen peroxide to the kaolin filter cake in step 1 is 1:300; stir at a speed of 120r / min for 10min, and keep the sulfuric acid pool by adding sulfuric acid solution Solution pH=1.

[0039] Step 3: Put barium thiocyanate into the sulfuric acid pool, the ratio of barium thiocyanate to the kaolin filter cake in step 1 is 1:100, and let it stand for 10 minutes to obtain iron-removing slurr...

Embodiment 2

[0043] Embodiment 2: a kind of kaolin iron removal process, the difference with embodiment 1 is that in step 2, in the sulfuric acid pool, the stirring time is 5min after passing into hydrogen peroxide, and keep the pH=2 in the sulfuric acid pool; The ratio of barium cyanate to kaolin filter cake is 1:150, and the standing time is 5 minutes.

Embodiment 3

[0044] Example 3: A kaolin iron removal process, the difference from Example 1 is that before the cleaning operation in step 5, the iron removal slurry is passed into the EDTA tank, and stirred at a speed of 60r / min for 5min.

[0045] Among them, the solution in the EDTA pool is made of EDTA and water according to the ratio of 1:2000. The specific operation is to add the corresponding weight of EDTA to the water at 70°C and stir it. The liquid-solid ratio of EDTA and the kaolin filter cake in step 1 is 1:500 in this implementation.

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Abstract

The invention discloses a deironing process for kaolin, belonging to the field of kaolin production. The deironing process comprises the following steps: 1, putting a kaolin filter cake into a sulfuric acid pool, and uniformly dispersing the kaolin filter cake; 2, introducing hydrogen peroxide, carrying out stirring for 5-10 minutes, and keeping the pH value of the solution in the sulfuric acid pool to be 1-2; 3, feeding barium thiocyanate into the sulfuric acid pool, wherein a ratio of barium thiocyanate to the kaolin filter cake in the step 1 is 1: (100-150), and carrying out standing for 5-10 min to obtain de-ironed ore pulp; 4, sampling the de-ironed ore pulp, carrying out filtering to obtain a kaolin-removed solution, and if the solution is red, introducing the de-ironed ore pulp in the step 2 into a sulfuric acid solution for replacement and washing and then cyclically repeating the step 3 and the step 4, or if the solution is transparent, carrying out step 5; 5, washing the de-ironed ore pulp obtained in the step 3 with clear water, and carrying out filter pressing to obtain a secondary kaolin filter cake; and 6, drying and pulverizing the secondary kaolin filter cake to obtain a finished kaolin product. The deironing process has the advantages that the iron content in the kaolin is reduced, the whiteness of the kaolin is improved, and the applicability of the process ishigh.

Description

technical field [0001] The invention relates to the field of kaolin production, more specifically, it relates to a kaolin iron removal process. Background technique [0002] Kaolin is a non-metallic mineral, a kind of clay and clay rock mainly composed of kaolinite clay minerals, and now it has become necessary for dozens of industries such as papermaking, ceramics, rubber, chemicals, coatings, medicine and national defense. Mineral raw materials. [0003] The quality of kaolin is generally evaluated by parameters such as whiteness, particle size, and plasticity. The whiteness is used as the main judgment parameter: generally, the more thoroughly the kaolin is bleached, the less iron content in the kaolin slurry, and the higher the whiteness of the kaolin due to the less colored iron oxide or ferrous oxide. The field is also wider. [0004] A Chinese invention patent with the notification number CN101798096B discloses a kaolin preparation method, including: mining and rem...

Claims

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Application Information

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IPC IPC(8): C01B33/40
CPCC01B33/40C01P2006/65
Inventor 罗书明杨月瑛周勇鹏
Owner 漳州市龙华矿产有限公司
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