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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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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 rel

Method used

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

Examples

Experimental program
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Example Embodiment

[0025] Example 1

[0026] Take samples of iron ore tailings, local red soil (silica-to-aluminum ratio 2.2), kaolin, and corn stalk ash, dry them in a ventilated room at 25°C for 2 days and sieving them with a mesh size of 120. The red soil, kaolin, and corn stalk ash Mix uniformly, the mass ratio is 9:9:3, and the total mass is 85g. Grind the product, sieving through 120 meshes and take a mass of 20g, take a dry sample of iron tailings through a sieve of 120 mesh to weigh, take 20g dry sample, and mix the product and dry iron tailings sample evenly in a petri dish to make the mixture The compaction coefficient is 0.9. Stir the solid water glass, NaOH, and water according to the mass ratio of 5:6:35 until fully and uniformly to prepare the lye. The weight of the lye is 20g. The prepared lye is uniformly infiltrated into the mixture, and it is allowed to stand at room temperature for 20 days. Add 20 g of the aqueous solution to evenly wet the surface of the covering layer, and pe...

Example Embodiment

[0028] Example 2

[0029] Take samples of copper mine tailings, local red soil (silica-aluminum ratio 2.2), micro-silica powder, and corn stalk ash, dry them in a ventilated room at 25°C for 2 days and sieving with a mesh size of 120. Dry the red soil and micro-silica powder. , Corn stalk ash is evenly mixed, the mass ratio is 9:5:3, and the total mass is 85g. Grind the product, sieving through 120 meshes and take a mass of 20g, take a dry sample of copper tailings through a sieve of 120 mesh, take 20g dry sample, and mix the product and dry iron tailings sample evenly in a petri dish to make the mixture The compaction coefficient is 0.9. The solid water glass, NaCO 3 , The water is stirred according to the mass ratio of 5:5:35 until the lye is fully and uniformly prepared, wherein the lye mass is 20g, the prepared lye is uniformly infiltrated into the mixture, and it is allowed to stand at room temperature for 20 days, and then add 20g of the aqueous solution to evenly wet The...

Example Embodiment

[0031] Example 3

[0032] An in-situ construction method of tailings covering layer includes the following steps:

[0033] (1) Mix the compounding agent uniformly according to the ratio of the raw materials to obtain the precursor material of the tailings solidified covering layer for use; the tailings are lead-zinc ore; the compounding agent includes the following raw materials by weight: plant ash 2 Parts, 9 parts of red soil, 5 parts of micro-silica powder; the plant ash is conifer ash; the red soil silicon-to-aluminum ratio is 2, and it is air-dried at 20°C to a moisture content of 10%; in the compound The raw material particles are all 200 meshes;

[0034] (2) Apply the precursor material of the overburden layer obtained in step (1) evenly to the tailings pond, turn the soil to break the tailings surface, the depth of the tailings surface is 0cm, and then mix the precursor materials and homogenize them. The mesh number of the raw material is more than 100 meshes, the mixture i...

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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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