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A method for preparing silicon-magnesium gel from asbestos tailings magnetic separation iron powder and residue

A technology of asbestos tailings and silicon-magnesium gel, which is applied in chemical instruments and methods, gel preparation, silicon oxide, etc., achieves the effects of high economy, low cost and simple process

Active Publication Date: 2021-07-20
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no report yet on the preparation of silicon-magnesium gel from the silicon-magnesium residue of asbestos tailings

Method used

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  • A method for preparing silicon-magnesium gel from asbestos tailings magnetic separation iron powder and residue
  • A method for preparing silicon-magnesium gel from asbestos tailings magnetic separation iron powder and residue
  • A method for preparing silicon-magnesium gel from asbestos tailings magnetic separation iron powder and residue

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] A kind of asbestos tailings magnetic separation iron fine powder and residue of the present embodiment prepare the method for silicon-magnesium gel, and its process flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0037] (1) Crushing and grinding the asbestos tailings to pass through a 150-mesh sieve, mixing and grinding with 0.5 times the weight of sodium hydroxide and 0.5 times the weight of lignite, and then roasting and activating to obtain an activated residue. The roasting temperature is 800 ° C and the roasting time is 2 hours;

[0038] (2) The activation residue is magnetically separated by a magnetic separator with a field strength of 12000Oe to obtain iron concentrate powder and silicon-magnesium residue with a grade of 68% and a yield of 90.5%;

[0039] (3) Si-Mg residue is impregnated with a sodium hydroxide solution of concentration 1.0mol / L, and separated by filtration to obtain alkali leaching solution and alkali leaching r...

Embodiment 2

[0043] A kind of asbestos tailings magnetic separation iron fine powder and residue of the present embodiment prepare the method for silicon-magnesium gel, and its process flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0044] (1) Crushing and grinding the asbestos tailings to pass through a 200-mesh sieve, mixing and grinding with 1.0 times the weight of sodium hydroxide and 0.5 times the weight of lignite, and then roasting and activating to obtain an activated residue. The roasting temperature is 800 ° C and the roasting time is 2 hours;

[0045](2) The activation residue adopts the magnetic separator of field strength 20000Oe to carry out magnetic separation, obtains the iron fine powder of grade 64%, productive rate 86% and silicon-magnesium residue;

[0046] (3) Si-Mg residue is impregnated with a sodium hydroxide solution of concentration 1.0mol / L, and separated by filtration to obtain alkali leaching solution and alkali leaching residue...

Embodiment 3

[0050] A kind of asbestos tailings magnetic separation iron fine powder and residue of the present embodiment prepare the method for silicon-magnesium gel, and its process flow chart is as follows figure 1 As shown, the specific steps are as follows:

[0051] (1) Crushing and grinding the asbestos tailings to pass through a 200-mesh sieve, mixing and grinding with 1.0 times the weight of sodium hydroxide and 1 times the weight of coke, and then roasting and activating to obtain an activated residue, the roasting temperature is 800 ° C, and the roasting time is 2 hours;

[0052] (2) The activation residue adopts the magnetic separator of field strength 20000Oe to carry out magnetic separation, obtains the iron fine powder of grade 62%, productive rate 92.6% and silicon-magnesium residue;

[0053] (3) Si-Mg residue is impregnated with a sodium hydroxide solution of concentration 1.0mol / L, and separated by filtration to obtain alkali leaching solution and alkali leaching residue;...

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Abstract

The invention belongs to the technical field of comprehensive utilization of tailings, and discloses a method for preparing silicon-magnesium gel by magnetically separating iron powder and residue from asbestos tailings. The asbestos tailings are crushed, ground and sieved, mixed with alkali and carbonaceous materials and ground, then roasted and activated to obtain activated residue; the activated residue is subjected to magnetic separation to obtain iron powder and silicon-magnesium residue; the silicon-magnesium residue is impregnated with lye and separated by filtration , to obtain the alkaline leaching solution and the alkali leaching residue; 2 Obtain silicic acid colloid; the alkali leaching residue is dissolved with acid solution to obtain magnesium salt solution, and CO 2 The magnesium bicarbonate solution is obtained; the silicic acid colloid and the magnesium bicarbonate solution are mixed, an organic foaming agent and a curing agent are added, stirred and mixed, evaporated and dried to obtain a silica-magnesium gel. The method of the invention obtains valuable iron concentrate powder, prepares silicon-magnesium gel with wide application, and realizes full resource comprehensive utilization of asbestos tailings.

Description

technical field [0001] The invention belongs to the technical field of comprehensive utilization of tailings, and in particular relates to a method for preparing silicon-magnesium gel by magnetically separating iron powder and residue from asbestos tailings. Background technique [0002] Asbestos tailings are tailings stripped from asbestos mineral processing. Asbestos tailings mines not only occupy a large amount of land resources, but also cause environmental pollution such as air, water and soil. Unseparated short fibers in asbestos tailings can easily cause respiratory diseases, asbestosis and lung cancer, and pose a threat to human health and safety. serious threat. Therefore, the safe and environmentally friendly treatment and disposal of asbestos tailings is of great significance for improving human health and the ecological environment. [0003] Since asbestos tailings contain a small amount of asbestos, it is mainly composed of serpentine, brucite, magnetite, etc....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/24C04B12/04C04B38/10C01F5/24C01B33/14B03C1/30B03C1/02B01J13/00C04B111/40
CPCB01J13/0052B03C1/02B03C1/30C01B33/14C01F5/24C04B12/04C04B28/24C04B38/10C04B2111/40C04B22/10C04B24/129C04B24/121
Inventor 宿新泰林璋兰滢滢田兰兰朱钱
Owner SOUTH CHINA UNIV OF TECH
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