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Method for removing calcium oxide for whitening by using low-whiteness talcum powder

A technology of talc and calcium oxide, applied in chemical instruments and methods, inorganic chemistry, silicon compounds, etc., can solve the problems of low whiteness of talc and high calcium oxide content, achieve simple process, promote development, huge economic value and The effect of social meaning

Inactive Publication Date: 2015-04-22
LIANG SHAN XICHENG NEW MATERIAL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the problems of low whiteness and high calcium oxide content of talc powder, the invention provides a method for removing calcium oxide and whitening talc powder with low whiteness

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) First remove 1000Kg of loess ore (whiteness 55) to remove surface impurities, and then heat and dry to make the water content less than 10%;

[0024] (2) After drying, crush and grind to make the fineness D50 reach more than 800 mesh;

[0025] (3) First add water into the mixing tank, the amount of water added is 2000Kg, and then add powder while stirring to fully stir the powder evenly;

[0026] (4) Add the stirred pulp into the reaction kettle, then slowly add hydrochloric acid to make the pH of the pulp = 4, and heat the pulp at the same time to keep the temperature at 55°C;

[0027] (5) Add hydrosulfate to the reaction kettle, the addition amount is 20Kg, and stir while adding hydrosulfite. After adding, keep the temperature at 55°C and react for 40 minutes;

[0028] (6) After the reaction is completed, add hydrogen peroxide to the reactor under stirring, the amount of hydrogen peroxide added is 2% of the solid content of the pulp, keep the temperature at 55°C,...

Embodiment 2

[0032] (1) First remove 1000Kg of loess ore (whiteness 65) to remove surface impurities, then heat and dry to make the water content less than 10%;

[0033] (2) After drying, crush and grind to make the fineness D50 reach more than 800 mesh;

[0034] (3) First add water into the mixing tank, the amount of water added is 2000Kg, and then add powder while stirring to fully stir the powder evenly;

[0035] (4) Add the stirred pulp into the reaction kettle, then slowly add hydrochloric acid to make the pH of the pulp = 5, and heat the pulp at the same time to keep the temperature at 65°C;

[0036] (5) Add hydrosulfite to the reaction kettle in an amount of 10Kg, and stir while adding hydrosulfite. After adding, keep the temperature at 65°C and react for 50 minutes;

[0037] (6) After the reaction is completed, add hydrogen peroxide to the reactor under stirring, the amount of hydrogen peroxide added is 2% of the solid content of the pulp, keep the temperature at 65°C, and react f...

Embodiment 3

[0041] (1) First remove 1000Kg loess ore (whiteness 66) to remove surface impurities, then heat and dry to make the water content less than 10%;

[0042] (2) After drying, crush and grind to make the fineness D50 reach more than 800 mesh;

[0043] (3) First add water into the mixing tank, the amount of water added is 2000Kg, and then add powder while stirring to fully stir the powder evenly;

[0044] (4) Add the stirred pulp into the reaction kettle, then slowly add hydrochloric acid to make the pH of the pulp = 5, and heat the pulp at the same time to keep the temperature at 60°C;

[0045] (5) Add sodium hydrosulfate to the reaction kettle, the addition amount is 15Kg, and stir while adding hydrosulfite. After adding, keep the temperature at 60°C and react for 45 minutes;

[0046] (6) After the reaction is completed, add hydrogen peroxide to the reactor under stirring, the amount of hydrogen peroxide added is 2% of the solid content of the pulp, keep the temperature at 60°C,...

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Abstract

The invention discloses a method for removing calcium oxide for whitening by using low-whiteness talcum powder. The method comprises the steps of (1) removing impurities of loess ores at first, and then drying by heating; (2) after drying, crushing and grinding; (3) adding water into a size mixing kettle at first, then adding a powder material while stirring, and fully stirring the powder material uniformly; (4) adding a well-stirred ore pulp into a reaction kettle, and then slowly adding hydrochloric acid; (5) adding sodium hydrosulfite into the reaction kettle, stirring at the same time, and reacting for 40-50 minutes; (6) adding oxydol into the reaction kettle while stirring to react for 20 minutes; (7) performing pressure filtration dehydration on the well-reacted ore pulp in a pressure filter, and then drying to obtain a finished product of talcum powder. The method disclosed by the invention is simple in process, safe and environment-friendly, can well improve the whiteness of the talcum powder and reduce the content of calcium oxide, and is suitable for large-scale industrial production, so that the method can promote the development of the low-whiteness talcum powder and prevent resource waste, and has huge economic values and social significance.

Description

technical field [0001] The invention relates to the technical field of chemical industry, in particular to a method for removing calcium oxide and whitening low-whiteness talc powder. Background technique [0002] Talc powder is called PULVISTALCI in English. It is white or off-white, fine, non-sandy powder, and feels greasy to the touch. Odorless and tasteless. This product is insoluble in water, dilute mineral acid or dilute alkali hydroxide solution. Can be used for medicinal purposes. [0003] The main component of talc is talc hydrous magnesium silicate, the molecular formula is Mg 3 MSi 4 o 10 ](OH) 2 . Talc is a monoclinic crystal system. The crystals are pseudo-hexagonal or diamond-shaped flakes, which are occasionally seen. Usually in dense block, leaf, radial, fibrous aggregates. Colorless, transparent or white, but due to a small amount of impurities, it appears light green, light yellow, light brown or even light red; the cleavage surface is pearly. Ha...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B33/20
Inventor 李远春谢丽
Owner LIANG SHAN XICHENG NEW MATERIAL CO LTD