Method for preparing high-quality diatomite by oscillation-based hydrochloric acid process

A technology of diatomite and hydrochloric acid method, applied in the direction of silicon oxide, silicon dioxide, etc., can solve the harsh process environment of atmospheric pressure boiling acid washing method, the corrosion and damage of diatomite structure, and restrict the quality, quality and application of diatomite. Scope and other issues, to achieve the effect of improving the quality and use of chemical activity

Inactive Publication Date: 2015-01-28
桂林新竹大自然生物材料有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existence of harmful impurity elements (such as iron, manganese, etc.) in diatomite restricts the quality, quality and application range of diatomite. At present, the more feasible methods for refining low-quality diatomite include alkali calcination and atmospheric pressure. Boiling pic

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  • Method for preparing high-quality diatomite by oscillation-based hydrochloric acid process

Examples

Experimental program
Comparison scheme
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Example Embodiment

[0026] Example 1

[0027] 1. Firstly, crush and disperse the diatomite concentrate obtained by preliminary purification to a particle size of 50-100 μm.

[0028] 2. Then mix the crushed diatomite powder with hydrochloric acid with a mass concentration of 20%;

[0029] The amount of HCl is 5 times of Σ(x×n).

[0030] 3. Then it is placed in a closed acid-proof and pressure-resistant reversible reactor, and the reaction is carried out during the reversal process. The reaction temperature is 80°C and the reaction time is 36 hours.

[0031] 4. After the reaction is completed, the reactant is taken out from the reactor after cooling, the liquid is filtered, and washed with hot water at 80°C ultrasonically until the pH of the diatomaceous earth and purified water is neutral, and then dried at 300°C for 5 hours.

[0032] 5. Calcining the dried product in an oxidizing environment for 1 hour. The calcination temperature is controlled at 500°C, and sufficient oxidation is required. The organic mat...

Example Embodiment

[0034] Example 2

[0035] 1. Firstly, crush and disperse the diatomite concentrate obtained by preliminary purification to a particle size of 25-50μm;

[0036] 2. Then mix the crushed diatomite powder with hydrochloric acid with a mass concentration of 36%;

[0037] The amount of HCl is 4 times of Σ(x×n).

[0038] 3. Then it is placed in a closed acid-proof and pressure-resistant reversible reactor, and the reaction is carried out during the reversal process. The reaction temperature is 100°C and the reaction time is 24 hours.

[0039] 4. After the reaction is completed, the reactant is taken out from the reactor after cooling, the liquid is filtered off, washed with hot water at 80°C and ultrasonically until the pH of diatomaceous earth and purified water is neutral, and then dried at 250°C for 3h.

[0040] 5. Calcining the dried product in an oxidizing environment for 1 hour. The calcination temperature is controlled at 750°C. Full oxidation is required to remove the organic matter, ca...

Example Embodiment

[0042] Example 3

[0043] 1. Firstly, the diatomite concentrate obtained by preliminary purification is pulverized and dispersed to a particle size of 10-25μm.

[0044] 2. Then mix the crushed diatomite powder with hydrochloric acid with a mass concentration of 25%;

[0045] The amount of HCl is 2 times of Σ(x×n).

[0046] 3. Then it is placed in a closed acid-proof and pressure-resistant reversible reactor, and the reaction is carried out during the reversal process. The reaction temperature is 60°C and the reaction time is 12 hours.

[0047] 4. After the reaction is completed, the reactant is taken out from the reactor after cooling, the liquid is filtered, and washed with hot water at 80°C ultrasonically until the pH of the diatomaceous earth and purified water is neutral, and then dried at 150°C for 2h.

[0048] 5. Calcining the dried material in an oxidizing environment for 1 hour. The calcination temperature is controlled at 800°C. The oxidation is required to be sufficient. The or...

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Abstract

The invention relates to a method for preparing high-quality diatomite by an oscillation-based hydrochloric acid process. According to the method, diatomite concentrate obtained by preliminary purification is taken as a raw material, heating reaction is performed with HCl under oscillation, filtration is performed to filter out sigma x TCln soluble matters, hydrochloric acid and the like, and washing, drying and calcination are performed to remove organic impurities, carbon and water in micropores of diatomite so as to obtain high-purity diatomite. According to the method provided by the invention, perfect biological porous active structure properties of amorphous SiO2 of diatomite are retained, diatomite after treatment has the advantages of high activity, high whiteness and low iron content, the whiteness can achieve 88-96, the content of SiO2 in diatomite is more than 98%, the iron content is lower than 0.4%, the specific surface is more than 20m<2>/g, and the quality and using properties of a product are greatly improved.

Description

technical field [0001] The invention relates to mineral purification, in particular to the refining of diatomite, in particular to a method for preparing high-quality diatomite based on a shaking hydrochloric acid method. Background technique [0002] Diatomaceous earth is an amorphous biomineralized siliceous mineral. The main chemical composition is amorphous silica, and the impurity composition mainly includes colloidal Al 2 o 3 , Fe 2 o 3 , MnO, CaO, MgO, K 2 O, Na 2 O.P 2 o 5 And organic matter and bone water. Usually white, off-white, light gray, light yellow and dark gray, light and porous. With the depletion of resources, there are fewer and fewer high-quality diatomites, and low-quality diatomites are modified and activated to reach the quality of high-quality diatomites, which is a hot field for the development of low-quality diatomites. [0003] The pore volume of diatom raw soil is generally 0.45 ~ 0.98cm 3 / g. It is precisely because the diatom shell...

Claims

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Application Information

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IPC IPC(8): C01B33/12
Inventor 王平匡猛韦仲华韦宇洪刘斌李呈权谢亮
Owner 桂林新竹大自然生物材料有限公司
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