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Bleaching production method for washing iron-dyed kaolin

A production method and kaolin technology, applied in aluminum silicate, silicate and other directions, can solve the problems of uneconomical economy, low iron removal efficiency, complex process, etc., and achieve controllable production process, considerable market prospects, and simple operation. Effect

Inactive Publication Date: 2010-06-09
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The disadvantages of this method are: the efficiency of iron removal is not high; the energy consumption is large; the process is relatively complicated, and large-scale industrial application needs to be perfected
In addition, Fe in kaolin used for bleaching 2 o 3 The content should not be too high (generally less than 1%), otherwise, the consumption of sodium hydrosulfite is too high, which is not economical

Method used

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  • Bleaching production method for washing iron-dyed kaolin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A subway in Fujian Province was used to dye kaolin. After washing, the natural whiteness of 325 mesh iron-dyed kaolin is 65%, the content of Fe in kaolin is 0.95%, and the content of Al is 37.8%. The main mineral composition is kaolinite and a very small amount of muscovite and quartz; Minerals mainly exist in irregular lamellar shape, with a small amount of tubular shape, and the whole is flocculent. Add the 325-mesh washed iron-dyed kaolin slurry with a converted dry weight of 20 tons into the bleaching tank, add water and stir to adjust the slurry concentration to 25%. Add concentrated sulfuric acid to adjust the pH value of the slurry to 3, add 3% sodium hydrosulfite to react for 45 minutes, and then add 0.8% oxalic acid to react for 15 minutes. Add water to wash 3 times until the pH value of the pulp is 6.5, drain the water after sedimentation, and the concentration of the precipitated product pulp reaches 32%. Put the bleached washing water into the wastewater t...

Embodiment 2

[0040] Adopted raw material and bleaching process are with embodiment 1. After conversion, the dry weight of kaolin is 15 tons, and the pulp concentration is 20%. The pH value of the pulp is 3, the amount of hydrosulfite added is 3%, the reaction time is 45min, the amount of oxalic acid is added 0.8%, the reaction time is 15min, and the pulp is washed 3 times until the pH value of the pulp is 7, and the concentration of the precipitated product pulp reaches 30%. Put the bleached washing water into the wastewater treatment tank, and add 0.8‰ quicklime while stirring to adjust the pH value of the wastewater to about 7. After stirring for 30 minutes, let it stand still for 5-6 hours, put clean water into the clean water pool, and waste residue treatment After multiple wastewater treatments, place the waste residue pool. Chemical analysis determined an iron content of 0.41% and an aluminum content of 37.13%, with no change in mineral composition and structure after bleaching. Th...

Embodiment 3

[0042] Adopted raw material and bleaching process are with embodiment 1. After conversion, the dry weight of kaolin is 30 tons, and the pulp concentration is 35%. The pH value of the pulp is 3, the amount of sodium hydrosulfite added is 3%, the reaction time is 45 minutes, the amount of oxalic acid is added 0.8%, the reaction time is 15 minutes, and the pH value of the pulp is 7 after washing for 3 times, and the concentration of the precipitated product pulp reaches 38%. Put the bleached washing water into the wastewater treatment tank, and add 0.8‰ quicklime while stirring to adjust the pH value of the wastewater to about 7. After stirring for 30 minutes, let it stand still for 5-6 hours, put clean water into the clean water pool, and waste residue treatment After multiple wastewater treatments, place the waste residue pool. Chemical analysis determined an iron content of 0.53% and an aluminum content of 36.99%, with no change in mineral composition and structure after blea...

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Abstract

The invention discloses a bleaching production method for washing iron-dyed kaolin, and relates to kaolin. The invention provides a bleaching production method for washing iron-dyed kaolin, which can obtain higher brightness, can realize wastewater recycle and environment-friendly clean production and is suitable for large-scale production. The method definitely gives the process parameters such as the using amount of sodium hydrosulfite, a pH value, solid-liquid ratio, reaction time, adding amount of complexing agent and complexing time, bleaching times, adding amount of sewage treating agent, a pH value of the wastewater and the like to achieve the optimal bleaching effect on the washing iron-dyed kaolin. The natural whiteness of the iron-dyed kaolin can be improved to over 80 percent from about 60 percent, and the sintering whiteness can be improved to over 90 percent from about 87 percent, which meet the whiteness requirements of high-grade daily ceramic raw materials. Meanwhile, the method can treat and recycle the wastewater.

Description

technical field [0001] The invention relates to kaolin, in particular to a bleaching production method of water-washed iron-dyed kaolin. Background technique [0002] High-quality high-purity kaolin has physical and chemical properties such as high whiteness, soft quality, easy dispersion and suspension in water, good plasticity and high cohesiveness, excellent electrical insulation performance and good fire resistance, and has become a popular choice for papermaking, ceramics, Mineral raw materials necessary for dozens of industries such as rubber and plastics, paint coatings, medicine and national defense. As an important non-metallic mineral, the consumption of kaolin is increasing at an annual rate of 2.55% to 5% in recent years. As a large number of kaolin mines have been mined and high-quality resources are decreasing day by day, the development and utilization of low-quality kaolin has become an important way to protect resources and achieve sustainable development o...

Claims

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Application Information

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IPC IPC(8): C01B33/26
Inventor 罗学涛沈晓杰李锦堂于瑞敏戴瑾陈文辉
Owner XIAMEN UNIV
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