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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 pickling process, and fluoride ions enter the water and soil environment, such as improper wastewater treatment, will cause serious damage Environmental pollution, high cost of refining
[0004] In the separation and refining process of middle and low-grade diatomite mainly composed of straight-chain algae, although high-grade refined diatomite can be produced by using the above method to meet the demand for catalyst production, the production cost is too high and the environmental pollution is serious

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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