Whitening method for washing iron-dyed kaolin

A kaolin, washing iron technology, applied in chemical instruments and methods, dyeing physical treatment, dyeing low molecular organic compound treatment and other directions, can solve the problems of high energy consumption, unsuitable for industrial production, complex process flow, etc. The effect of high speed, simple operation and low cost

Inactive Publication Date: 2009-12-16
XIAMEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of this method are: the efficiency of iron removal is not high, the demand for energy consumption is large, the process flow is relatively complicated, and large-scale industrial application needs to be further improved
[0009] In summary, there are certain deficiencies in the main technological methods at present, or they are not suitable for industrial production.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] 1) Taking Longhai iron-dyed kaolin in Fujian Province as an example, the natural whiteness of Longhai iron-dyed kaolin after washing is 60.51%, the sintered whiteness at 1280°C is 84.13%, the Al content is 38.03%, and the Fe content is 1.03%. The main mineral composition is kaolinite, with small amounts of muscovite and quartz. The mineral structure is mainly scaly, with a small amount of tubular.

[0034] 2) Add 16 tons dry weight of Longhai iron dyed kaolin into the bleaching tank, add water and stir to adjust the pulp concentration to 15%, then add concentrated sulfuric acid to adjust the pH value of the pulp to 2, add 2% hydrosulfite to react for 40 minutes Add 0.7% oxalic acid to react for 15 minutes, then add water to wash until the pH value of the pulp is 7, drain the water after settling, so that the concentration of the pulp reaches 45%, and then send it to the peeling machine through a mud pump for ultrafine grinding to 2500 mesh.

[0035] 3) The measured ble...

Embodiment 2

[0039] Embodiment 2: raw ore and technical process are the same as embodiment 1. The dry weight of kaolin is 20 tons, the pulp concentration is 20%, the pH value of the pulp is 2, the amount of hydrosulfite added is 3%, the reaction time is 50 minutes, the amount of oxalic acid is added 0.9%, the reaction time is 15 minutes, and the pH value of the pulp is 6 after washing, and the pulp concentration is 40 %, flake to 3000 mesh. The measured bleaching earth whiteness is 82%, the sintered whiteness at 1280°C is 91.7%, the Fe content is 0.52%, and the Al content is 36.96%. The amount of whitening agent ammonium chloride is 3%, the calcination temperature is 980°C, and the time is 90min. The whiteness of calcined kaolin after depolymerization and dispersing can reach 93%, the fineness is about 2500 mesh, and the Al content is 44.00%, and the Si content is 55.10%.

Embodiment 3

[0040] Embodiment 3: raw ore and technical process are the same as embodiment 1. The dry weight of kaolin is 20 tons, the pulp concentration is 25%, the pH value of the pulp is 3, the amount of hydrosulfite added is 4%, the reaction time is 60min, the amount of oxalic acid is 1%, the reaction time is 20min, and the pH value of the pulp is washed until the pH value is 6, and the pulp concentration is 35 %, flake to 3500 mesh. The measured bleaching earth whiteness is 82.0%, the sintered whiteness at 1280°C is 91.5%, the Fe content is 0.51%, and the Al content is 37.82%. The amount of whitening agent ammonium chloride is 4%, the calcination temperature is 980°C, and the time is 120min. The whiteness of calcined kaolin after depolymerization and dispersing can reach 92%, the fineness is about 2500 mesh, and the Al content is 44.57%, and the Si content is 55.12%.

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Abstract

The invention discloses a whitening method for washing iron-dyed kaolin, and relates to kaolin. The invention provides the whitening method for washing the iron-dyed kaolin, which can remove iron in the iron-dyed kaolin with higher whiteness, has lower cost and can be industrialized. The method comprises the following steps: washing crude kaolin ore to remove detrital minerals such as fine sand, feldspar and the like and coarse impurities such as rock debris and the like, then adding a bleaching agent into the kaolin ore to reduce ferric iron in the kaolin ore into ferrous iron, washing the ferric iron, filtering and removing the iron, finally making iron impurities in the clay and chlorine react to generate gaseous ferric chloride salt by adding a whitening agent into the solution and calcining the kaolin ore, and eliminating the ferric chloride salt in a mode of volatilization so as to achieve the aims of removing the impurities and improving the whiteness of the kaolin.

Description

technical field [0001] The invention relates to a kind of kaolin, in particular to a production process of bleaching and calcining whitening of washed iron-dyed kaolin. Background technique [0002] As an important non-metallic mineral, kaolin ore is being exploited in large quantities at present, and high-quality resources are decreasing day by day. High-quality calcined kaolin, especially high-white and ultra-fine calcined kaolin is in short supply, and the development and utilization of inferior kaolin has become a matter of great concern to manufacturers. [0003] Iron-stained kaolin has an iron content as high as about 1%, and the iron contained in it is ferric iron that is insoluble in water, so special methods are required for iron removal and whitening. At present, the methods of iron removal and whitening of kaolin reported in the literature mainly include flotation method, high gradient magnetic separation method, and acid treatment method; calcination whitening m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09C1/42C09C3/04C09C3/06C09C3/08
Inventor 罗学涛戴瑾李锦堂陈文辉
Owner XIAMEN UNIV
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