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Method of preparing nanomaterials in multiple structures from iron-rich low-grade clay minerals

A technology of clay minerals and nanomaterials, which is applied in the direction of nanotechnology, magnetic materials, and nanotechnology for materials and surface science, can solve the problems of waste of resources, deep color of clay minerals, and many associated minerals, and achieve stable quality. Efficient conversion and utilization, excellent performance

Active Publication Date: 2019-06-21
LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Clay minerals are extremely abundant in nature, but because the "genes" of the basic structural units constituting different clay minerals are similar, a variety of minerals (such as montmorillonite, illite, muscovite, quartz, Feldspar, etc.) are usually formed simultaneously, resulting in a complex composition of naturally occurring clay minerals, with many associated minerals
In addition, during the long geological formation process, the isomorphic substitution phenomenon of clay minerals will occur, and the Mg(II) or Al(III) ions in the octahedral layer will be replaced by Fe(III) or other color-causing metal ions, resulting in Clay minerals have a darker color, which restricts their application in the industrial field
Since the existing technology cannot efficiently and comprehensively utilize miscellaneous ores in low-grade clay minerals, low-grade ores are treated as tailings, resulting in a serious waste of resources

Method used

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  • Method of preparing nanomaterials in multiple structures from iron-rich low-grade clay minerals
  • Method of preparing nanomaterials in multiple structures from iron-rich low-grade clay minerals
  • Method of preparing nanomaterials in multiple structures from iron-rich low-grade clay minerals

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Red low-grade attapulgite clay mineral (SiO 2 Content 65%, Fe 2 o 3 Content 6%) crushed through a 200-mesh sieve. Take 1 kg and disperse it into 8 kg of 3.5 mol / L mixed acid (ascorbic acid: hydrochloric acid = 1:3 molar ratio) aqueous solution. After microwave hydrothermal treatment at 120 °C for 30 minutes, centrifuge and collect the supernatant to obtain solution B; the solid is dried , pulverized to obtain white powder A;

[0029] Weigh 200g of white powder A, disperse it into 3000g aqueous solution containing 90g of magnesium ions, add 40g of ammonium chloride, and then add ammonia water to adjust the pH value to 10, mix well, put it into a hydrothermal reaction kettle, seal it, and put it at a temperature of 160°C After reacting for 12 hours, cooling to room temperature, centrifuging, washing, and vacuum drying to obtain layered magnesium silicate nanomaterials;

[0030] Add sodium hydroxide solution to solution B to adjust the pH value to 13, then reflux at 10...

Embodiment 2

[0032] Iron-rich low-grade bentonite (SiO 2 Content 50%, Fe 2 o 3Content 9.8%) crushed into powder and passed through 200 mesh sieve. Weigh 1 kg and disperse it into 8 kg of 3.5 mol / L mixed acid (ascorbic acid: hydrochloric acid = 1:3 molar ratio) aqueous solution. After microwave hydrothermal treatment at 120°C for 30 minutes, centrifuge and collect the centrifuged supernatant to obtain solution B. The solid was dried and pulverized to obtain white powder A;

[0033] Weigh 200g white powder A, disperse it into 3000g aqueous solution containing 240g zinc ions, add 200g ammonium sulfate, then add ammonia water to adjust the pH value to 12, mix well, put it into a hydrothermal reactor, seal it, and react at a temperature of 120°C 12h, after cooling to room temperature, centrifuge, wash, and vacuum-dry to obtain zinc silicate nanomaterials with nanoflower-like morphology;

[0034] Add sodium hydroxide solution to solution B, adjust the pH value of the solution to 10, then rea...

Embodiment 3

[0036] Iron-rich sepiolite (SiO 2 Content 56%, Fe 2 o 3 Content 7.8%) crushed into powder and passed through 200 mesh sieve. Weigh 1 kg, disperse it into 8 kg of 3.5 mol / L mixed acid (ascorbic acid: hydrochloric acid = 1:3 molar ratio) aqueous solution, and after microwave hydrothermal treatment at 120°C for 30 minutes, centrifuge and collect the centrifuged supernatant to obtain a solution B; The solid is dried and pulverized to obtain a white powder A;

[0037] Weigh 200g of white powder A, disperse it into 3000g of aqueous solution containing 200g of nickel ions, add 100g of ammonium nitrate, then add ammonia water to adjust the pH value to 11, mix well and put it into a microwave hydrothermal reaction kettle, seal it, and store it at a temperature of 140°C After reacting for 12 hours, cooling to room temperature, performing centrifugation, washing, and vacuum drying to obtain nanomaterials with nano-cluster morphology;

[0038] Add sodium hydroxide solution to solution...

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Abstract

The invention provides a method of preparing nanomaterials in multiple structures from iron-rich low-grade clay minerals. The method comprises the steps of dissolving out octahedral metal ions from the clay minerals using acid to form high-purity SiO2 and an aqueous solution rich in the metal ions, obtaining metal silicate nanomaterials with different patterns through an in-situ conversion-crystallization reaction between SiO2 and the different metal ions under a hydrothermal condition, obtaining two-dimensional layered hydroxide through an in-situ alkali sediment-crystallization reaction of the solution rich in the metal ions prepared by acid dissolution, performing calcining treatment, converting an iron-containing component into magnetic iron oxide, and obtaining the magnetic layered nanomaterial. According to the method, an octahedral and tetrahedral 'splitting-recombination' strategy is adopted for the various minerals in the iron-rich low-grade clay minerals; a technical bottleneck problem in all-component conversion for synthesizing the nanomaterial from the silicate clay minerals precisely, efficiently and economically is solved; and comprehensive and efficient utilizationof all components in the low-grade clay minerals is achieved.

Description

technical field [0001] The invention relates to a method for preparing various structural nanomaterials by using iron-rich low-grade clay minerals, and belongs to the technical field of deep processing of non-metallic minerals and preparation of nanomaterials. Background technique [0002] Clay minerals are composed of the most abundant elements on the earth, such as O, Si, Al, Fe, Ca, Na, K and Mg, through silicon-oxygen tetrahedron (SiO 4 ) and Mg, Al or Fe oxygen octahedra (MO 6 ) composed of hydrous magnesium-rich aluminum silicate minerals, due to their special natural nanostructure and morphology (such as nanorods, nanotubes, nanolayers, nanofibers), as an important basic material, it has been used in chemical industry, environmental protection, It has been widely used in agriculture, building materials, new materials and other fields. [0003] Clay minerals are extremely abundant in nature, but because the "genes" of the basic structural units constituting different...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/20C01B33/24B82Y30/00H01F1/00H01F1/03H01F41/02
Inventor 王文波王爱勤董文凯汪琴宗莉牟斌朱永峰康玉茹惠爱平
Owner LANZHOU INST OF CHEM PHYSICS CHINESE ACAD OF SCI
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