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A restoration matrix for abandoned mine pits in limestone quarries and its preparation method and landfill method

A quarry, limestone technology, applied in the field of ecological restoration of abandoned mines, to achieve the effect of saving costs, alleviating desertification and air pollution caused by sand and dust

Active Publication Date: 2020-07-28
WUHAN UNIV OF TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention can simultaneously solve the problems of landfill repair of abandoned mine pits, treatment of tailings sand and resource utilization of urban sludge

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] A method for preparing a repair matrix for an abandoned mine pit in a limestone quarry provided in this embodiment comprises the following steps:

[0052] 1) The sludge from Wuhan Hanxi Sewage Treatment Co., Ltd. is selected, and its water content is 76.8wt%. Use a twin-screw mixer to mix the sludge and calcium oxide powder evenly. The calcium oxide powder blending ratio is 25wt%, and the particle size is ≥ 40 mesh. After mixing, it is naturally stacked in the sun shed for 5 days, and the moisture content is further reduced to 23.5wt%. .

[0053] 2) Transport the stabilized sludge to the mixing system, add tailings sand (the proportion of tailings sand mixing is 60wt%, particle size<10cm, water content≤20%), and after standing for 1 day, the restoration for mine pit landfill is obtained matrix.

[0054] 3) Use the restoration matrix for -105m mine pit landfill, and compact it with a road roller every 1m of landfill.

[0055] The water content of the mine restoration ...

Embodiment 2

[0057] A kind of preparation method that the present invention is used for the restoration matrix of abandoned mine pit of limestone quarry comprises the following steps:

[0058] 1) Sludge from the emergency sewage treatment station for comprehensive water environment management of Huangxiao River is selected, and its water content is 73.9wt%. Use a twin-screw mixer to mix the sludge and calcium oxide powder evenly. The mixing ratio of calcium oxide powder is 15wt%, and the particle size is ≥40 mesh. .

[0059] 2) Transport the stabilized sludge to the mixing system, add tailings sand (tailings sand mixing accounts for 35wt%,

[0060] 3) Use the restoration matrix to fill the mine pit at -50m, and compact it with a road roller every time 1m is buried.

[0061] The water content of the mine restoration matrix prepared in this example is 24.9wt%, pH is 8.58, fecal coliform group value>9.3, ova mortality rate>99%, transverse shear strength is 28.6KN / ㎡, conforms to GB / T23485 -...

Embodiment 3

[0063] The invention provides a method for preparing a restoration matrix for an abandoned mine pit in a limestone quarry, comprising the following steps:

[0064] 1) The sludge from Wuhan Xincheng Sewage Treatment Co., Ltd. is selected, and its water content is 75.1wt%. Use a twin-screw mixer to mix the sludge and calcium oxide powder evenly. The mixing ratio of the calcium oxide powder is 8wt%, and the particle size is ≥40 mesh. .

[0065] 2) Transport the stabilized sludge to the mixing system, add tailings sand (the proportion of tailings sand mixing is 15wt%, particle size <10cm, water content ≤20%), and after standing for 1 day, the restoration for mine pit landfill is obtained matrix.

[0066] 3) The restoration matrix is ​​used for landfilling of mine pits above -20m, and compacted with a road roller every time 1m is buried.

[0067] The water content of the mine repair matrix prepared in this example is 26.7wt%, pH is 7.88, fecal coliform group value>11.1, egg mort...

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Abstract

The invention provides a preparation method of a repairing substrate for a limestone quarry abandoned mine and a mining pit. The preparation method comprises the steps that (1), different proportion of calcium oxide powder is mixed to stabilize urban domestic sludge; and (2), the stabilized sludge is mixed with different proportion of tailing sand to obtain the repairing substrate, the urban domestic sludge and the wasted tailing sand of mine fields are fully used by the repairing substrate, and resource utilization of various waste is achieved. The invention further provides a landfill methodof the repairing substrate prepared through the preparation method. The landfill method comprises the steps that (1), an impermeable layer is laid; (2) the repairing substrate is subjected to landfill; and (3), surface layer planting soil is covered. According to the landfill method, a reasonable solving method is provided for ecological repairing problem of the abandoned mine and the mining pit,the problems such as desertification and air pollution due to mine field over-exploitation are relieved, the suitable repairing substrate is subjected to landfill according to the depth of the miningpit, thus it is guaranteed that the best sludge absorptive and ecological remediation effects are achieved, the surface layer soil is improved, and conditions are created for return-greening the abandoned mines.

Description

technical field [0001] The invention relates to the technical field of ecological restoration of abandoned mines, in particular to a repairing matrix for abandoned mine pits in limestone quarries, a preparation method and a landfill method thereof. Background technique [0002] With the development of my country's urban economy and the increase of population, the amount of urban domestic sewage treatment is increasing day by day, and a large amount of domestic sludge will be produced in the process of sewage treatment. The composition of municipal domestic sludge is complex. In addition to containing a large amount of nitrogen, phosphorus, various trace elements and organic matter and other available components, it also contains a certain amount of salt, refractory organic matter, pathogens and parasites (eggs) and other toxic and harmful substances. If it is directly discharged without reducing, stabilizing, and harmless treatment, it will easily cause serious secondary pol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E21C41/32E02D31/00B09B1/00A01B79/00
CPCA01B79/00B09B1/00E02D31/004E21C41/32Y02W30/30
Inventor 桂厚瑛宁静蔡瑶瑶林善明周秋名尹传件
Owner WUHAN UNIV OF TECH
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