Method for preparing porous silicon dioxide by utilizing asbestos tailings

A technology of porous silica and asbestos tailings, which is applied in the directions of silica, silica, chemical instruments and methods, etc., can solve the problem of easily corroded containers by acid solutions, easily corroded containers by alkaline solutions, low magnesia leaching rate, etc. problems, to achieve the effect of easy promotion and application, low equipment requirements and low cost

Active Publication Date: 2019-01-25
SHAANXI SCI TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantages of the above disclosed acid leaching method are: insufficient acid treatment, low leaching rate of magnesium oxide, easy to cause secondary pollution during the treatment process; and acid solution is easy to corrode the container, which requires high equipment and high cost
[0004] The Chinese patent No. 105502426B "Method for preparing water glass by extracting silicon oxide from chrysotile tailings by strong alkali roasting method" discloses a method of leaching with strong alkali as a chemical auxiliary agent; the strong alkali roasting method The disadvantage is that the lye is easy to corrode the container, which is highly corrosive and requires high equipment

Method used

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  • Method for preparing porous silicon dioxide by utilizing asbestos tailings
  • Method for preparing porous silicon dioxide by utilizing asbestos tailings
  • Method for preparing porous silicon dioxide by utilizing asbestos tailings

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0044] A method for preparing porous silicon dioxide from asbestos tailings, comprising the steps of:

[0045] (1) Ball milling. Take an asbestos tailings in southern Shaanxi, crush them in a ball mill with a rotating speed of 220r / min, and mill them for 8 hours to obtain tailings powder with a particle size of 4.0um to 534.9um; among them, the asbestos tailings include magnesium oxide 40%~42%, silicon dioxide 43%~45%, iron oxide 3%~5%, nickel oxide 0.45%~0.55%;

[0046] (2) Mixing, filtering the above tailings powder with a 400-mesh sieve, and then mixing it with ammonium bisulfate evenly to prepare a powder mixture with a mass ratio of tailings powder and ammonium bisulfate of 1:2.93;

[0047] (3) Roasting, the above powder mixture is moved into a corundum crucible, and then reacted in a box-type resistance furnace at a temperature of 500 ° C for 2.5 hours to obtain powder clinker;

[0048] (4) Dissolution, dissolve the above powder clinker with deionized water to obtain a ...

Embodiment 2

[0052] A method for preparing porous silicon dioxide from asbestos tailings, comprising the steps of:

[0053] (1) Ball milling, pulverize the asbestos tailings in a ball mill with a rotational speed of 240r / min, and ball mill for 7.5 hours to obtain tailings powder with a particle size of 4.0um to 534.9um;

[0054] (2) Mixing, the above tailings powder is filtered through a stainless steel metal screen with a pore size of 0.0374mm, and then mixed with ammonium bisulfate to obtain a powder mixture with a mass ratio of tailings powder and ammonium bisulfate of 1:3.1;

[0055] (3) Roasting, move the above powder mixture into a corundum crucible, and then react in a box-type resistance furnace at a temperature of 530°C for 2.3 hours to obtain powder clinker;

[0056] (4) Dissolution, dissolving the above powder clinker with deionized water 5.5 times the mass of powder clinker to obtain a clinker turbid liquid; Alkaline clinker turbid liquid;

[0057] (5) Separation, using a Buc...

Embodiment 3

[0060] A method for preparing porous silicon dioxide from asbestos tailings, comprising the steps of:

[0061] (1) Ball milling, pulverize the cotton tailings in a ball mill with a rotating speed of 210r / min, and ball mill for 8.5 hours to obtain tailings powder with a particle size of 4.0um to 534.9um;

[0062] (2) Mixing, filter the above tailings powder with a sieve with a pore size less than 0.0374mm, and then mix it evenly with ammonium bisulfate to prepare a powder mixture with a mass ratio of tailings powder and activator ammonium bisulfate of 1:3.3 ;

[0063] (3) Roasting, move the above powder mixture into a corundum crucible, and then react in a box-type resistance furnace at a temperature of 470°C for 3 hours to obtain powder clinker;

[0064] (4) Dissolution, dissolving the above powder clinker with deionized water with 6 times the mass of powder clinker to obtain a clinker turbid liquid; Alkaline clinker turbid liquid;

[0065] (5) Separation, using a Buchner f...

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Abstract

The invention relates to the field of tailing resource utilization, in particular to a method for preparing porous silicon dioxide by utilizing asbestos tailings. The method comprises the steps of (1)ball milling, wherein asbestos tailings are smashed and are subjected to ball milling to prepare tailing powder; (2) material mixing, wherein the tailing powder is filtered and mixed with an activating agent, and mixed material powder is prepared; (3) roasting, wherein the mixed material powder is put in a chamber electric furnace for reaction, and clinker power is prepared; (4) dissolution, wherein the clinker powder is dissolved in water to prepare clinker fluid, then the clinker fluid is adjusted to be alkaline, and alkaline clinker fluid is prepared; (5) separation, wherein the alkaline clinker fluid is filtered and separated; (6) drying, wherein after filtering, residual solid products are dried, and the porous silicon dioxide is prepared. The adopted auxiliary agent ammonium bisulfate is low in corrosion on equipment, pollution and cost, not only can the resource utilization for asbestos tailings be achieved, but also secondary pollution cannot be caused, and the method meets the requirements of green production and is suitable for industrial production.

Description

technical field [0001] The invention relates to the field of resource utilization of tailings, in particular to a method for preparing porous silicon dioxide from asbestos tailings. Background technique [0002] Asbestos tailings are mineral residues produced in asbestos mining and selection. The main component is serpentine, and it also contains a small amount of talc, dolomite and calcite. The chemical composition of asbestos tailings is mainly SiO 2 , MgO and a small amount of iron, aluminum, calcium and other substances. According to statistics, tens of millions of tons of asbestos tailings are produced in my country every year. These huge asbestos tailings not only occupy a large amount of land resources, but also pollute the environment. [0003] The Chinese patent "Method for Comprehensive Utilization of Asbestos Tailings" with the announcement number 101792184A discloses a direct acid leaching method for resource utilization. The Chinese patent No. 102352435A "A h...

Claims

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Application Information

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IPC IPC(8): C01B33/12B01J20/10B01J20/28B01J20/30C02F1/28C02F101/30
CPCB01J20/103C01B33/12C02F1/281B01J20/28054C01P2004/03C01P2002/72C02F2101/308
Inventor 罗清威
Owner SHAANXI SCI TECH UNIV
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