Kaoline alkaline static bleaching technology

A technology of kaolin and kaolin ore, applied in the directions of aluminum silicate, silicate, fibrous filler, etc., can solve the problems of speeding up hydrosulfite hydrolysis, slowing hydrosulfite hydrolysis, difficult to achieve bleaching effect, etc., and achieves great promotion. Value and application prospects, stable bleaching effect, and effect of saving hydrosulfite

Inactive Publication Date: 2009-09-16
茂名市银华高岭土实业有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In acidic medium, the hydrolysis rate of hydrolysis powder is much faster than the bleaching rate of kaolin, resulting in waste of sodium hydrosulfite
In alkaline medium, the hydrolysis rate of sodium hydrolyzate at normal temperature is obviously slowed down, and it is difficult to achieve the bleaching effect under normal conditions, due to Fe 3+ reduced to Fe 2+ The reaction is reversible, if the hydrolysis rate of sodium bicarbonate is too slow, there is not enough reducing capacity in the medium, and some Fe 2+ will be oxidized to Fe 3+ , affecting the bleaching effect
In alkaline medium, to speed up the hydrolysis rate of hydrolysis powder, heating can be used, which will consume a lot of heat and is uneconomical in production

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In the kaolin alkaline static bleaching process of the present invention, the kaolin slurry with a pH value of 7.5 after classification is directly sent into the mixing tank, and sodium hydrosulfite is added. kg / m 3 The pulp is mixed evenly and transported to the pulp storage tank. After the pulp storage tank is full, let it stand for 10 hours, then discharge the pulp to the stirring tank, add sulfuric acid and oxalic acid as regulators, adjust the pH value of the pulp to 3, and complete the whole bleaching after stirring evenly process, wherein, based on the concentration of 98% sulfuric acid and anhydrous oxalic acid, the amount of oxalic acid is 15% of the total weight of the regulator.

Embodiment 2

[0018] In the kaolin alkaline static bleaching process of the present invention, the kaolin slurry with a pH value of 8 after classification is directly sent into the mixing tank, and sodium hydrosulfite is added. kg / m 3 The pulp is mixed evenly and transported to the pulp storage tank. After the pulp storage tank is full, it is allowed to stand for 20 hours, then the pulp is discharged to the stirring tank, and the regulator sulfuric acid and oxalic acid are added to adjust the pH value of the pulp to 4. Stir evenly to complete the whole bleaching process, wherein, based on the concentration of 98% sulfuric acid and anhydrous oxalic acid, the amount of oxalic acid is 20% of the total weight of the regulator.

Embodiment 3

[0020] In the kaolin alkaline static bleaching process of the present invention, the kaolin slurry with a pH value of 9 after classification is directly sent into the mixing tank, and sodium hydrosulfite is added. kg / m 3 The pulp is mixed evenly and transported to the pulp storage tank. After the pulp storage tank is full, let it stand for 30 hours, then discharge the pulp to the stirring tank, add sulfuric acid and oxalic acid as regulators, adjust the pH value of the pulp to 5, and complete the whole bleaching after stirring evenly process, wherein, based on the concentration of 98% sulfuric acid and anhydrous oxalic acid, the amount of oxalic acid is 25% of the total weight of the regulator.

[0021] Specific application examples:

[0022] The inventor built a set of alkaline static bleaching process in Yinhua Kaolin Industry Co., Ltd., Maoming City. The mixing tank and the acid-adding stirring tank are two ￠3000×2000mm mixing tanks, and the slurry storage tanks are 4 conc...

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PUM

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Abstract

The invention relates to kaoline alkaline static bleaching technology. The technology comprises: evenly mixing classified kaoline ore slurry and rongalite, standing the mixture for a while, adding a regulator into the mixture, controlling the ore slurry pH value to between 3 and 5, and evenly stirring the mixture to obtain the product. The technology has the advantages of simple operation, easy realization in production and obvious effect, can be widely used in kaoline processing enterprises and has great popularization value and application prospect.

Description

technical field [0001] The invention belongs to the field of kaolin processing, in particular to an alkaline static bleaching process of kaolin. Background technique [0002] Most of the bleaching methods of kaolin are reduction bleaching, which is to remove the colored Fe in kaolin 3+ reduced to colorless Fe 2+ , after dehydration Fe 2+ Remove to whiten the kaolin. Sodium hydrosulfite used in industrial production (scientific name: sodium dithionite, molecular formula: Na 2 S 2 o 4 ) as reducing agent and sulfuric acid as regulator. The specific method is to use sulfuric acid to adjust the pH value of the pulp to 2-3, then add hydrosulfite and stir for 30 minutes to complete the bleaching, which is carried out intermittently in one tank during production. Because sodium bicarbonate is very unstable, it will be hydrolyzed when it meets water, and the hydrolysis process will produce reduction, and the hydrolysis speed will increase with the decrease of pH value. In ac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/26C09C1/42
Inventor 王运新全明华
Owner 茂名市银华高岭土实业有限公司
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