Two-stage method for separating and refining diatomaceous earth

A technology of refining diatomite and two-step method, which is applied in the field of two-step separation and refining of diatomite, which can solve the problems of environmental pollution, difficult recovery, fluorine ion entry, etc.

Inactive Publication Date: 2004-01-07
INST OF SOIL SCI CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Pickling refined diatomite with sulfuric acid not only has a large acid consumption, but the pickling waste liquid contains a large amount of soluble iron and aluminum ions, and is not easy to recycle, causing serious environmental pollution; the yield of refined diatomite is low, generally below 50% , the refining cost is high
Pickling with a mixed acid of sulfuric acid and hydrofluoric acid, although the amount of acid can be reduced, but there are also those problems in the sulfuric acid pick

Method used

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  • Two-stage method for separating and refining diatomaceous earth
  • Two-stage method for separating and refining diatomaceous earth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Take a 5000 ml beaker, add 2900 ml of water to 1000 g of diatomite, and beat the diatomite into a slurry; add 100 ml of 15% sodium hexametaphosphate solution, and stir evenly. Put it in an electric furnace and heat it to a slight boil, and keep it for 45 minutes. After the slurry is cooled, separate and remove the heavy sand larger than 200 meshes. The remaining slurry is placed in a bucket with a water level of 120 cm. Settling and separating 4 times to remove tailings less than 1 micron . Then use 30% sulfuric acid to carry out pickling according to acid: soil ratio of 4:1, and the heating time is 8 hours. After the sample is dried, refined diatomite is obtained. Its chemical composition and pickling yield are as follows: Table 1 Pickling and refining Elemental composition (%) of diatomite and pickling yield sample ignition loss SiO 2 Fe 2 o 3 al 2 o 3 TiO 2 Pickling yield (%) Raw soil 6.69 66.66 3.75 18.20 0.71 Pickling refined soil 2.18 90.51 0.27 ...

Embodiment 2

[0024] Take a 5000ml beaker, add 2900ml of water to 1000g of diatomite, and beat the diatomaceous earth into a slurry; add 100ml of 15% sodium oxalate solution, stir well, and disperse with ultrasonic waves for 30 minutes; separate and remove more than 200 The purpose is heavy sand, and the remaining slurry is settled and separated twice in a bucket with a water level of 120 cm to remove tailings less than 1 micron. Then use 38% sulfuric acid to carry out pickling according to acid: soil ratio of 2:1, and the heating time is 12 hours. After the sample is dried, refined diatomite is obtained. Its chemical composition and pickling yield are as follows: Table 2 pickling and refining Elemental composition (%) of diatomite and pickling yield sample ignition loss SiO 2 Fe 2 o 3 al 2 o 3 TiO 2 Pickling yield (%) Raw soil 6.69 66.66 3.75 18.20 0.71 Pickling fine soil 2.11 90.81 0.25 3.24 0.41 86.3 Pickling acid: soil is 2:1, pickling time is 12 hours, and pickling temp...

Embodiment 3

[0026] Take a 5000 ml beaker, add 2900 ml of water to 1000 g of diatomite, and beat the diatomite into a slurry; add 100 ml of 15% sodium hexametaphosphate solution, and stir evenly. Put it in an electric furnace and heat it to a slight boil, and keep it for 45 minutes. After the pulp cools, separate and remove the heavy sand larger than 200 meshes. The remaining pulp is placed in a bucket with a water level of 120 cm. Settle and separate for 3 times, and remove the tailings smaller than 1 micron . Then use 35% sulfuric acid to carry out acid pickling at a ratio of 3:1 of acid: soil, and the heating time is 10 hours. After the sample is dried, refined diatomite is obtained. Its chemical composition and pickling yield are as follows: Table 3 pickling and refining Elemental composition (%) of diatomite and pickling yield sample ignition loss SiO 2 Fe 2 o 3 al 2 o 3 TiO 2 Pickling yield (%) Raw soil 6.69 66.66 3.75 18.20 0.71 Pickling refined soil 2.20 91.09 0.21...

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Abstract

A process for preparing high quality infusorial earth by washing the medium-low grade infusorial earth in water and acid successively. It includes adding oxalate or phosphate as a reductive dispersant in infusorial earth, stirring strongly/digesting/ultrasonic dispersing; washing with water firstly to remove clay impurity and sulfuric acid secondary to remove iron-aluminium oxide. The product canbe used as the material of catalyst carrier.

Description

technical field [0001] The invention belongs to the technical field of separation and purification of diatomite, and relates to a new method suitable for diatomite of various grades to be refined into high-grade products through water washing-acid washing step by step, in particular to a method suitable for diatomite containing clay and other impurities. A two-step method for separating and refining high-grade diatomite into high-grade products. Background technique [0002] Diatomite has a wide range of uses in industrial and agricultural production, especially high-grade diatomite is an important chemical raw material, such as high-purity diatomite can be used as a catalyst carrier. But not all diatomite with high purity can be used as catalyst carrier. According to the existing research results, only high-purity diatomite mainly composed of straight-chain algae can produce high-quality catalysts. my country's Jilin Changbai diatomite although SiO 2 The content is high a...

Claims

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Application Information

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IPC IPC(8): B01J21/16C01B33/113
Inventor 史学正于东升陆长青孙维侠王洪杰
Owner INST OF SOIL SCI CHINESE ACAD OF SCI
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