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In-situ construction method of tailing covering layer

A construction method and technology of covering layer, applied in the field of mineral processing and environmental protection, can solve the problems of unclear impact of steel slag life, pollution of groundwater and lakes, backward mineral processing technology, etc., to achieve strong adsorption capacity, maintain reactivity, energy and resources The effect of low demand

Inactive Publication Date: 2019-11-08
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Because the ore grade of many mines is too low, multi-component symbiosis, and the mineral processing technology in some areas is backward, resulting in a serious waste of mineral resources, and because the tailings particles are finely broken, the following problems occur during the stacking process: flow and collapse; weathering corrosion; pollution groundwater and lakes
It prevents the migration and diffusion of pollutants in the horizontal direction. Due to the large demand restrictions on external solid waste and raw materials and transportation costs, the limitations of raw materials are relatively large, and the longitudinal leaching of tailings cannot be avoided, and the addition of a large amount of steel slag will shorten its life. impact is unclear
Some scholars have proposed a method of using tailings rotary kiln to prepare geopolymers (201811395606.4). The active material prepared by calcining tailings to prepare cementitious materials has good reactivity and has a good application prospect for tailings covering layer , but requires a lot of energy, and off-site disposal, tailings acquisition is the limiting factor, and the high cost of the processing process is not economical

Method used

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  • In-situ construction method of tailing covering layer
  • In-situ construction method of tailing covering layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Samples of iron ore tailings, local red soil (silicon-aluminum ratio 2.2), kaolin, and corn stalk ash were taken and dried in a ventilated room at 25°C for 2 days and sieved separately with a mesh number of 120. The red soil, kaolin, and corn stalk ash Mix evenly, the mass ratio is 9:9:3, and the total mass is 85g. Grind the product, sieve 120 mesh and take 20g of mass, take a dry sample of iron tailings and sieve 120 mesh, weigh, take 20g of dry sample, mix the product and dry iron tailing sample evenly and place them in a petri dish to prepare a mixed material, and the compaction coefficient was measured to be 0.9. Stir the solid water glass, NaOH, and water according to the mass ratio of 5:6:35 until fully uniform to obtain lye, wherein the mass of lye is 20g, uniformly infiltrate the mixture with the prepared lye, let it stand at room temperature for 20 days, and again Add 20 g of aqueous solution to evenly wet the surface of the covering layer, and test after 7 da...

Embodiment 2

[0029] Take copper ore tailings samples, local red soil (silicon-aluminum ratio 2.2), micro-silica fume, and corn stalk ash in a ventilated room for 2 days at 25°C and sieve with a mesh number of 120. Air-dried red soil, micro-silica fume 1. Mix the corn stalk ash evenly, the mass ratio is 9:5:3, and the total mass is 85g. Grind the product, sieve 120 mesh and take 20g of mass, take a dry sample of copper tailings, sieve 120 mesh and weigh, take 20g of dry sample, mix the product and dry iron tailing sample evenly and place them in a petri dish to prepare a mixed material, and the compaction coefficient was measured to be 0.9. Solid water glass, NaCO 3 1. Stir the water according to the mass ratio of 5:5:35 until it is fully uniform to obtain lye, in which the mass of lye is 20g, soak the mixture evenly with the lye, let it stand at room temperature for 20 days, add 20g of aqueous solution again to wet it evenly Cover the surface of the layer and let it stand for 7 days at r...

Embodiment 3

[0032] An in-situ construction method for a tailings covering layer, comprising the following steps:

[0033] (1) Mix the compounding agent evenly according to the proportion of raw materials to obtain the precursor material of the tailings solidified covering layer, and set aside; the tailings are lead-zinc ore; the compounding agent includes the following raw materials in parts by weight: plant ash 2 9 parts of red soil, 5 parts of silica fume; the plant ash is coniferous tree ash; the silicon-aluminum ratio of the red soil is 2, and it is air-dried at 20°C until the water content is 10%; The particle size of the raw material is 200 mesh;

[0034] (2) Apply the overburden precursor material obtained in step (1) evenly to the tailings pond, turn over the soil and break the surface of the tailings. The depth of the overturning and crushing of the surface of the tailings is 0 cm, and then mix the precursor material and homogenize it. The mesh number of raw materials is more th...

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Abstract

The invention discloses an in-situ construction method of a tailing covering layer. The in-situ construction method comprises the following steps: uniformly mixing original tailings and a compoundingagent according to a certain proportion to prepare a covering layer substance, covering a tailing pond with the prepared covering layer substance, carrying out mixing, and applying alkali liquor to obtain a solidified tailing covering layer. The tailing covering layer provided by the invention has the characteristics of controlled dissolution of solidified heavy metals and leaching resistance, andthe materials are cheap and are easy to obtain. Compared with a covering layer of a conventional tailing pond, the tailing covering layer constructed by the method has the advantages of stability, energy and resource conservation, and environment friendliness.

Description

technical field [0001] The invention belongs to the fields of mineral processing and environmental protection, and in particular relates to an in-situ construction method of a tailings covering layer. Background technique [0002] The situation of soil pollution in my country is very serious, among which tailings polluted soil accounts for as much as one-third, and the number of accumulated tailings is increasing by more than 300 million tons every year. Serious soil pollution has endangered food safety, human health, ecological security and agriculture. Sustainable development even affects the foreign trade of agricultural products and the interests of environmental diplomacy. Because the ore grade of many mines is too low, multi-component symbiosis, and the mineral processing technology in some areas is backward, resulting in a serious waste of mineral resources, and because the tailings particles are finely broken, the following problems occur during the stacking process: ...

Claims

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Application Information

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IPC IPC(8): B09C1/08
CPCB09C1/08B09C2101/00
Inventor 田森林严鑫睿胡学伟黄建洪李英杰赵群宁平陈杰李波
Owner KUNMING UNIV OF SCI & TECH
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