A kind of fine-grain tailings surface curing agent and its application method

A technology of fine-grain tailings and surface solidification, which is applied in the field of environmental engineering, can solve the problems of wind migration of heavy metals and environmental hazards, and achieve the effects of improved curing effect, low curing cost and short curing cycle

Active Publication Date: 2022-03-15
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to address the deficiencies of the prior art, and at the same time solve the problem of the wind migration of fine-grain tailings and the migration of heavy metals that may cause harm to the surrounding environment under the condition of rainfall forming runoff. The present invention provides a fine-grain tailings Tailings surface curing agent and its application method

Method used

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  • A kind of fine-grain tailings surface curing agent and its application method
  • A kind of fine-grain tailings surface curing agent and its application method
  • A kind of fine-grain tailings surface curing agent and its application method

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Embodiment 1

[0035] Embodiment 1 of the present invention is the surface solidification method of gold tailings, comprising the following:

[0036] The solidified gold tailings particles come from the tailings pond of Xinda Gold Mine in Baotou, Inner Mongolia. The content of the tailings with a particle size of 2 Solution+30ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ②30ml NaAlO 2 Solution+10ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ③20ml NaAlO 2 Solution+20ml Na 2 SiO 3 Solution+20mlNa 2 CO 3 Solution, each component of each group of curing agent combination solution is sprayed 3 times and 5 times respectively, and the interval between two sprays is 5 days. After each spraying of the above mixed solution, 10ml of per 100g of tailings is sprayed Spray CaCl at a ratio of 240mM calcium chloride solution 2 Solution, after spraying the solution, the tailings were air-dried under natural drying conditions, and the compressive strength of the surface solidified body spraye...

Embodiment 2

[0040] Embodiment 2 of the present invention is the surface solidification method of copper tailings, comprising the following contents:

[0041] The solidified copper tailings particles come from the tailings pond of Zhongwei Copper Mine in Ningxia. The particle size of the tailings is all below 1mm, and the Si / Al molar ratio is 6.66; 1mol / L sodium metaaluminate solution, 1mol / L metaaluminate Sodium silicate solution, 1mol / L sodium carbonate solution, and anhydrous calcium chloride solid configuration concentration is 240mM calcium chloride solution to form the curing agent. According to the surface area of ​​the tailings reservoir and the target solidification thickness to be obtained, spray 60ml of the mixed solution of sodium metaaluminate solution, sodium metasilicate solution and sodium carbonate solution per 100g of tailings; 2 Solution+30ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ②30ml NaAlO 2 Solution+10ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ③20...

Embodiment 3

[0045] Embodiment 3 of the present invention is the surface solidification method of gold tailings, comprising the following:

[0046] The solidified gold tailings come from the tailings pond of Xinda Gold Mine in Baotou, Inner Mongolia. The content of tailings with a particle size of 2 Solution+30ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ②30ml NaAlO 2 Solution+10ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 solution, ③20ml NaAlO 2 Solution+20ml Na 2 SiO 3 Solution+20ml Na 2 CO 3 Solution, the remaining 10ml in each ratio is calcium chloride solution; the ratio of adding 100ml of curing agent is: ④ 20ml NaAlO 2 Solution+40mlNa 2 SiO 3 Solution+30ml Na 2 CO 3 solution, ⑤40ml NaAlO 2 Solution+20ml Na 2 SiO 3 Solution+30ml Na 2 CO 3 solution, ⑥30ml NaAlO 2 Solution+30ml Na 2 SiO 3 Solution+30ml Na 2 CO 3 solution, the remaining 10ml in each proportion is calcium chloride solution, add the curing agent of the above proportion in the tailings, then fully sti...

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Abstract

The invention discloses a surface curing agent for fine-grain tailings and an application method thereof. The curing agent is composed of four components: sodium metasilicate solution, sodium metaaluminate solution, sodium carbonate solution and calcium chloride solution; The amount of sodium aluminate solution and sodium metaaluminate solution is determined according to the Si / Al molar ratio of the fine-grained tailings itself, and the CO in the curing agent 3 2‑ and Ca 2+ Concentrations are determined according to how the curing agent is used, and two methods of application of the curing agent are proposed. Under the calcification and hydration induced by metasilicate, metaaluminate and carbonate functional groups, tailings particles will generate geopolymer and calcium carbonate precipitation, and the compressive strength of the solidified body can reach about 1000-3500Kpa. The classification can reach the level of "strongly cemented soil or soft rock" to realize the cementation and fixation of tailings particles, so that the surface particles will not migrate with wind or rainwater runoff, and the leaching of heavy metals can be inhibited.

Description

technical field [0001] The invention relates to the technical field of environmental engineering, in particular to a surface curing agent for fine-grained tailings and an application method thereof, which solidify the fine-grained tailings on the surface of metal tailings ponds and inhibit the migration of tailings particles. Background technique [0002] Mineral resources are considered to be the material basis for national development and human survival. During the development and utilization of mineral resources, industrial waste tailings will be generated, especially a large number of tailings stored in the open air will migrate with the wind after drying. A large amount of valuable metals remain in the mine, which will lead to a series of environmental problems over time, and pose a certain threat to human health and safety. The tailings produced by non-ferrous metal beneficiation are hazardous wastes. The particles are often fine, and more than 80% of the particle size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/12C04B28/00E02D3/12C04B18/12
CPCC04B40/0039C04B28/00E02D3/12C04B2111/00784C04B12/04C04B22/0093C04B22/10C04B22/124C04B18/12Y02W30/91Y02P40/10
Inventor 张道勇王文艺潘响亮
Owner ZHEJIANG UNIV OF TECH
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