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Method for mining and machining water-soluble potassium salt mine

A potash mine, water-soluble technology, applied in the fields of mining fluids, earthwork drilling, alkali metal chlorides, etc., can solve problems such as being unfavorable to large-scale production, unable to fully utilize geothermal heat, and low brine concentration.

Inactive Publication Date: 2011-11-23
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method is not conducive to large-scale production, and cannot make full use of geothermal heat, and the concentration of brine is low

Method used

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  • Method for mining and machining water-soluble potassium salt mine
  • Method for mining and machining water-soluble potassium salt mine
  • Method for mining and machining water-soluble potassium salt mine

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0266] Drilling and mining part:

[0267] Taking carnallite ore as an example, when the buried depth of the mine is 150-600 meters, the total thickness of the ore layer is 1.5-75m, the content of potassium oxide is 6%-22%, and the content of sodium chloride is 10%-40%. The drilling method is as follows: Drill a vertical well on the ground with an ordinary drilling rig, and the diameter of the final hole is 240mm. After reaching 100 meters above the mine floor, the inclination is increased, and the horizontal drilling is used when reaching the mine floor. The vertical well in the middle is drilled at a distance of 1600 meters from the first well in the rectangular limited area. The diameter of the final hole is 150 mm. For horizontal drilling, dock with the horizontal section of the first well, then drill horizontally in the opposite direction, and repeat this until the distance between the vertical wells at both ends reaches 3,200 meters. Alloy steel pipes with a diameter of 2...

Embodiment 2

[0286] Drilling and mining part:

[0287] Taking potassium halite as an example, when the buried depth of the mine is 1500-4500 meters, the total thickness of the ore seam is 0.95-55m, the content of potassium oxide is 6%-24%, and the content of sodium chloride is 20%-40%, the following drilling methods are adopted:

[0288] Ordinary drilling rigs are used to drill vertical wells on the ground. The diameter of the final hole is 120mm. After reaching 100 meters above the mine floor, the inclination is increased. When reaching the mine floor, horizontal drilling is used for horizontal drilling. The horizontal drilling distance is 600m. In the limited area, at a distance of 1,200 meters from the first well, the vertical well in the middle is drilled, the diameter of the final hole is 85mm, and after reaching 100 meters above the floor of the mine, the inclination is increased, and the floor of the mine is changed to horizontal drilling. Dock with the horizontal section of the fir...

Embodiment 3

[0305] Drilling and mining part:

[0306] Taking potash rock salt mine as an example, when the buried depth of the mine is below 4500 meters, the total thickness of the ore seam is 2.5-35m, the content of potassium oxide is 6%-30%, and the content of sodium chloride is 20%-40%, the following drilling methods are adopted:

[0307] Ordinary drilling rigs are used to drill vertical wells on the ground. The diameter of the final hole is 120mm. After reaching 150 meters above the mine floor, the inclination is increased. When reaching the mine floor, horizontal drilling is used for horizontal drilling. The horizontal drilling distance is 1000m. 2,000 meters away from the first well in the limited area, the vertical well in the middle is drilled down, the diameter of the final hole is 85mm, and after 150 meters above the bottom of the mine, the inclination is increased, and the bottom of the mine is changed to horizontal drilling. Dock with the horizontal section of the first well, ...

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Abstract

The invention discloses a method for mining and machining a water-soluble potassium salt mine. The method disclosed by the invention comprises the following steps: firstly, exploiting the potassium salt mine by adopting a well drilling water soluble method; evaporating and crystallizing the exploited brine to sequentially precipitate a sodium salt and a potassium salt; refrigerating and crystallizing the residual feed liquid to further precipitate potassium chloride; and respectively filtering and drying the precipitated sodium salt and potassium salt to obtain finished sodium salt and potassium salt, wherein a part of mother liquor after the sodium salt and potassium salt are precipitated is used for preparing magnesium chloride, and the other part is used for preparing magnesium oxide. The method disclosed by the invention is particularly suitable for the exploitation of a potassium mine having the defects of complicated geological and hydrologic conditions, over-shallow or over-deep burial, poor quality and high carnallite content, can reduce ground collapse, improves the exploitation rate, can prepare a potassium fertilizer in a large scale and has the advantages of low energy consumption and little pollution and waste discharge.

Description

technical field [0001] The invention relates to a mining and processing method of water-soluble potassium salt ore, which is especially suitable for mining and processing of potassium salt ore under complex geological conditions. Background technique [0002] At present, according to the different properties of potassium salt deposits, there are many mining and processing methods. The introduction is as follows: (1) For potassium-containing brine, such as the Dead Sea, the brine can be directly extracted to the sun-dried salt pond, and after a long period of segmented solar evaporation, carnallite is gradually precipitated at the bottom of the pond, and the collected carnallite is washed and crystallized Potassium chloride is obtained after treatment with flotation and other processes. (2) For potassium-containing dry salt lakes exposed on the surface, such as Qinghai Chaerhan Salt Lake and Lop Nur in my country, Atacama Salt Lake in Chile, etc., it is generally used to dig...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E21B43/00C01D3/08C01F5/40C01F5/30C01F5/02
Inventor 马凯马培华方勇王金铭郑秀兴刘树海贲艳英
Owner CHINA NAT OFFSHORE OIL CORP
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