Method of purifying diatom shale to prepare diatom ooze functional filler

A diatom shale and functional filler technology, applied in the field of chemical raw material manufacturing, can solve the problems of specific surface area reduction, loss of raw ore structure, affecting functions, etc., and achieve the effect of high added value and good whiteness

Inactive Publication Date: 2018-08-17
上海广拓投资有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, the structure of diatomite or diatom shale is destroyed, and some properties of the original ore structure are lost, such as micropore melting becomes larger, specific surface area decreases, pore volume decreases, etc., thereby affecting its own functions.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The invention provides a method for purifying diatom shale to prepare diatom mud functional filler, comprising the following steps:

[0029] 1) Grind 500g diatom shale raw ore into 200 mesh powder;

[0030] 2) Dry the powder in a drying furnace at a temperature of 380°C until the moisture content is less than 5wt%;

[0031] 3) Transfer the dried powder to the purification kettle, add 1.2L of acidic solution, heat up to the boiling of the mixed solution under stirring, keep it warm for 5.5 hours, and then cool to below 60°C;

[0032] 4) Filter and wash with water until the pH value of the filtrate reaches 6.0, then stop washing;

[0033] 5) After the filtered filter residue is filtered through the diaphragm, it is calcined in a calcination chamber, calcined at 600°C for 6 hours, and then cooled naturally;

[0034] 6) Crush the calcined and cooled material to 325 meshes to obtain the finished product.

[0035] Further, the acidic solution is a mixed solution of water, ...

Embodiment 2

[0037] The invention provides a method for purifying diatom shale to prepare diatom mud functional filler, comprising the following steps:

[0038] 1) Grind 500g diatom shale raw ore into 200 mesh powder;

[0039] 2) Dry the powder in a drying furnace at a temperature of 400°C until the moisture content is less than 5wt%;

[0040] 3) Transfer the dried powder to the purification kettle, add 1.2L of acidic solution, heat up to the boiling of the mixed solution under stirring, keep it warm for 5.5 hours, and then cool to below 60°C;

[0041] 4) Filter and wash with water until the pH value of the filtrate reaches 6.0, then stop washing;

[0042] 5) After the filtered filter residue is filtered through a diaphragm, it is calcined in a calciner, calcined at a temperature of 750°C for 5 hours, and then cooled naturally;

[0043] 6) Crush the calcined and cooled material to 325 meshes to obtain the finished product.

[0044] Further, the acidic solution is a mixed solution of wat...

Embodiment 3

[0046] The invention provides a method for purifying diatom shale to prepare diatom mud functional filler, comprising the following steps:

[0047] 1) Grind 400g diatom shale raw ore into 200 mesh powder;

[0048] 2) Dry the powder in a drying furnace at a temperature of 380°C until the moisture content is less than 3wt%;

[0049] 3) Transfer the dried powder to the purification kettle, add 1L of acidic solution, heat up to the boiling of the mixed solution under stirring, keep it warm for 5 hours, and then cool it down to below 60°C;

[0050] 4) Filter and wash with water until the pH value of the filtrate reaches 6.0, then stop washing;

[0051] 5) After the filtered filter residue is filtered through the diaphragm, it is calcined in a calcination chamber, calcined at 600°C for 6 hours, and then cooled naturally;

[0052] 6) Crush the calcined and cooled material to 800 meshes to obtain the finished product.

[0053] Further, the acidic solution is a mixed solution of wat...

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PUM

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Abstract

The invention provides a method of purifying diatom shale to prepare a diatom ooze functional filler. The method comprises following steps: grinding diatom shale ores into powder; drying powder in a drying oven until the water content is less than 5 wt%; transferring dried powder to a purification kettle, adding an acidic solution into the purification kettle, heating the purification kettle understirring until the mixed solution is boiling, maintaining the temperature for 5 to 6 hours, then cooling until the temperature is lower than 60 DEG C; filtering, washing the reaction product by water, stopping washing when the pH value of the filtrate reaches 6.0; after filtration, subjecting the filter residues to membrane filter pressing, burning the filter residues in a calcining furnace, cooling after burning; and grinding cooled substances to obtain a finished product. A chemical leaching method is adopted, the whiteness and main component contents of the product are greatly improved; the whiteness and purity of the product are high, the internal structure of diatom shale is well maintained, and the product has a wide application range.

Description

technical field [0001] The invention relates to the technical field of manufacturing chemical raw materials, in particular to a method for purifying and preparing diatom mud functional fillers from diatom shale. Background technique [0002] Diatom shale is a kind of siliceous rock, which is a kind of biogenic siliceous sedimentary rock because it is formed by the accumulation and evolution of ancient diatom remains. Its chemical composition is mainly SiO 2 , containing a small amount of Al 2 o 3 , Fe 2 o 3 , CaO, MgO, K 2 O, Na 2 O.P 2 o 5 and organic matter. SiO 2 Usually more than 80%, up to 94%. The color of diatom shale is white, off-white, gray and light taupe, etc., and its chemical and physical properties are stable. At the same time, diatom shale is also porous, with a large porosity, and its mesopore number is 5000-6000 times that of activated carbon. We call this unique structure "molecular sieve", and its adsorption performance is strong. When diatom ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/06C04B20/02C04B14/08
CPCC04B20/06C04B14/08C04B2111/00482C04B20/026
Inventor 毛建云刘平余志强
Owner 上海广拓投资有限公司
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