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Method for purifying low-grade sepiolite

A purification method and technology of sepiolite, applied in magnesium silicate, silicate and other directions, can solve the problems of complex production process, long production cycle, low product grade, etc., to avoid ore pollution, short process and cycle, simple craftsmanship

Inactive Publication Date: 2017-05-31
XIANGTAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The above purification process of sepiolite has problems such as complex production process, long production cycle, and low product grade, but due to industrial amplification, it cannot meet the needs of actual production

Method used

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  • Method for purifying low-grade sepiolite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The steps of this embodiment are as follows:

[0028] (1) Weigh 5.00g of sepiolite raw ore with a sepiolite content of about 30%, a total of 2 samples, marked as 1 and 1#, of which 1 is the control group without ultrasound, and 1# is the ultrasound group. Add water to the above samples according to the solid-liquid ratio of 1:8, and let the sepiolite fully absorb water and swell for more than 12 hours;

[0029] (2) Add the above samples with 0.2% sodium hexametaphosphate as a dispersant, stir at 400rpm for 3h, and ultrasonicate the experimental group for 20min in an ultrasonic instrument with an ultrasonic frequency of 40KHz and a sound intensity of 40w / cm 2 , and then the sample was left to stand for 1h; the control group was not ultrasonicated;

[0030] (3) Take out the suspension of the upper layer, centrifuge at 900 rpm for 5 minutes, discard the upper layer of water, dry the lower layer at 108°C for 24 hours, and grind to obtain the product.

[0031] The sepiolit...

Embodiment 2

[0033] The steps of this embodiment are as follows:

[0034] (1) Weigh 5g of raw sepiolite with a content of 20%, 2 samples in total, marked as 2 and 2#, of which 2 is the control group without ultrasound, and 2# is the ultrasound group. Add water to the above samples according to the solid-to-liquid ratio of 1:14, and let the sepiolite fully absorb water and swell after standing for more than 12 hours;

[0035] (2) Add the above samples with 0.3% sodium hexametaphosphate as a dispersant, stir at 300rpm for 3h, and ultrasonicate the experimental group for 20min in an ultrasonic instrument with an ultrasonic frequency of 40KHz and a sound intensity of 30w / cm 2 , and then the sample was left to stand for 4h; the control group was not ultrasonicated;

[0036] (3) Take out the suspension of the upper layer, centrifuge at 900 rpm for 5 minutes, discard the upper layer of water, dry the lower layer at 108°C for 24 hours, and grind to obtain the product.

[0037] The sepiolite prod...

Embodiment 3

[0039] In this example, water is added to the raw ore, dispersant is added to the pulp, and pulp is made under the combined action of mechanical stirring, ultrasonic assistance and dispersant dispersion; then sedimentation to obtain sepiolite-rich pulp ore; pulp vacuum filter dehydration, drying, and grinding To obtain the product, the concrete process steps are as follows:

[0040] Sepiolite pulping: the sepiolite raw ore selected has a sepiolite content of about 31%, and the remaining components are talc, quartz, calcite, etc. Add raw sepiolite and water into the stirring tank according to the solid-to-liquid ratio of 1:10, add a mixture of sodium hexametaphosphate and sodium pyrophosphate with a solid mass of 0.2% as a dispersant, turn on the ultrasonic generator, and the ultrasonic frequency is 5000KHz. The strength is 75w / cm 2. Turn on the mixer and continue to stir to prepare the ore slurry, the stirring speed is 400rpm, and the stirring time is 60min;

[0041] Purifi...

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Abstract

The invention discloses a method for purifying low-grade sepiolite. The method comprises the following steps: adding water and a dispersing agent into raw ore of sepiolite, and pulping under coactions of mechanical stirring, ultrasonic assistance and dispersion of the dispersing agent; obtaining sepiolite-enriched ore pulp through gravity settling; dehydrating, drying and grinding by using a vacuum filter, thereby obtaining a product. The method mainly aims to rapidly purify a sepiolite product under coactions of ultrasonic assistance and dispersion of the dispersing agent on the basis of a settling method. The method is simple in process, relatively short in preparation flow and preparation cycle, no other aids are needed except a small amount of the dispersing agent, ore pulp pollution is avoided, and later fine processing or secondary purification can be facilitated.

Description

technical field [0001] The invention belongs to the field of inorganic material processing, and in particular relates to a method for purifying low-grade sepiolite ore by means of an ultrasonic-assisted physical sedimentation method. Background technique [0002] Sepiolite is a magnesium silicate natural clay mineral, which belongs to the sepiolite-palygorskite clay mineral group. It is mainly distributed in a few countries such as Spain, China, the United States, and Turkey in the world. Its special layer-chain structure formed by the alternating arrangement of magnesium-oxygen octahedron and silicon-oxygen tetrahedron makes sepiolite have microporous channels in the same direction, and is rich in silicon hydroxyl groups. The above characteristics make sepiolite have Large specific surface area, uniform pore size, rich active sites, excellent hydrothermal stability and ion exchange performance, therefore, sepiolite is widely used in harmful gas adsorption, heavy metal disp...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/22
CPCC01B33/22C01P2006/80
Inventor 胡夏一周业丰刘利斌罗潇陈洪波
Owner XIANGTAN UNIV
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