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A method for comprehensive utilization of asbestos tailings

A technology of asbestos tailings and hydrotalcite, applied in the field of resource utilization of solid waste, can solve the problems of insufficient further utilization of iron, aluminum and calcium, incomplete separation of waste, and insufficient extraction effect

Inactive Publication Date: 2016-08-31
HARBIN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] 1. The utilization of waste is incomplete, and the application mainly focuses on the utilization of magnesium and / or silicon, such as a method for preparing siliceous porous materials from asbestos tailings acid leaching residue (application number: 200810222081), a method of using asbestos tailings to prepare The method of flaky nano-magnesium hydroxide and spherical nano-silica (application number: 200810222081), etc., did not make full use of iron, aluminum and calcium in asbestos tailings, causing secondary pollution
[0005] 2. The separation of waste is not complete. At present, the acid extraction method based on sulfuric acid is mainly used in the research to realize the separation of metal and silicon. As we all know, silicon and metal exist in the form of silicate, and the content of silicon dioxide is much higher than that of silicon dioxide. Much higher than the number of metals, many metal ions are wrapped by silica, it is difficult to achieve effective separation
Its negative impact is reflected in the , Sulfuric acid is not ideal for the extraction of metal ions, and its extraction effect is not as good as hydrochloric acid and nitric acid
, The difficulty of further processing of sulfate is greater than that of corresponding nitrate and hydrochloride
[0006] 3. At this stage, the target product for resource utilization of magnesium in asbestos tailings is single, and the scope of product utilization is not wide
Moreover, because there are many types of metal elements other than magnesium in asbestos tailings, it is difficult to simplify the process flow of magnesium resource recycling in asbestos tailings

Method used

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  • A method for comprehensive utilization of asbestos tailings
  • A method for comprehensive utilization of asbestos tailings
  • A method for comprehensive utilization of asbestos tailings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) Weigh 10g of asbestos tailings into a beaker containing 200mL 1-2mol / L NaOH, 180 o C-200 o C is heated under water for 1-7 days, and the solid and liquid are separated to obtain solid substance A and solution B.

[0022] (2) Add 1 g of solid substance A to 1-50 mL of water, adjust the pH to 2-6 with hydrochloric acid or nitric acid, sonicate for 0.5-10 h, and filter to obtain filter residue C and filtrate. Add trivalent metal hydrochloride or nitrate to the filtrate to adjust the ratio of divalent metal ions to trivalent metal ions in the solution from 2 to 4, and adjust the pH to 10-11 with sodium hydroxide.

[0023] (3) 80 o C, after reacting for 8 hours, the precipitate was filtered and dried to obtain a hydrotalcite-like material.

[0024] (4) Combine solid C with solution B, soak for 2-10 days, and heat up to 60 o C-150 o C, adjusting the pH to 7-8, filtering and drying to obtain white carbon black.

[0025] (5) The prepared hydrotalcite-like material i...

Embodiment 2

[0027] On the basis of Example 1, the difference is (2) adding trivalent metal salt as Al(NO 3 ) 3 , to adjust the ratio of divalent metal ions and trivalent metal ions in the solution to 2.15. The generated hydrotalcite-like compound has a good lamellar structure and high adsorption efficiency, and the adsorption capacity for removing methyl orange is 171 mg / g.

Embodiment 3

[0029] On the basis of Example 1, the difference is (2) adding trivalent metal salt as Al(NO 3 ) 3 , to adjust the ratio of divalent metal ions and trivalent metal ions to 4 in the solution. Al(NO 3 ) 3 Because the cost of common aluminum salts is low, and the ratio is 4, the consumption of chemical reagents is reduced, the production cost is further reduced, and the waste utilization rate is improved.

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Abstract

The present invention belongs to the technical field of solid waste recycling, and relates to a comprehensive utilization method of asbestos tailings. The method comprises the specific steps of: adding asbestos tailings to a NaOH solution, conducting hydrothermal treatment, and conducting solid-liquid separation to obtain a solid substance A and a solution B; adding A to the water, adjusting the pH value by acid, conducting ultrasound treatment for 0.5-10 h, and filtering residue C; adjusting the ratio divalent metal ions and trivalent metal ions in the solution and the pH value, reacting for 8 h, filtering and drying to obtain a hydrotalcite-like material; and combining solid C and solution B, soaking, adjusting the pH value, filtering and drying to obtain white carbon black. The present invention has the advantages of complete utilization of the wastes, a lot of target product, wide range of product utilization, and simple production process.

Description

technical field [0001] The invention belongs to the technical field of resource utilization of solid waste, and relates to a method for comprehensive utilization of asbestos tailings. Background technique [0002] Asbestos is a general term for silicate minerals with long, flexible fibers. Asbestos tailings are mineral residues produced during asbestos processing, and its main components are serpentine asbestos, brucite, magnetite, quartz and other minerals. The main chemical components of asbestos tailings are silicon and magnesium, and a small amount of iron, aluminum, calcium, etc. Studies have shown that asbestos can cause lung cancer, asbestosis and other diseases. Therefore, asbestos has been listed as a carcinogen by the World Health Organization. If such carcinogenic substances are not recycled and discharged indiscriminately, it will certainly cause major hidden dangers to the natural environment and human health. ( Nature , 484, 27–28, 2013. and Lung Cance...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F7/02C01B33/12
Inventor 李松南张囡囡刘悦婕张家伟蔡清海
Owner HARBIN NORMAL UNIVERSITY
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