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Coagulating salt for potassium salt solid mine backfilling and manufacturing method thereof

A manufacturing method and technology of coagulation salt, which are applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve problems such as affecting the production and safety of mining areas, low backfill strength, and coal seam collapse, etc., and achieve good social benefits. and economic benefits, low cost and simple manufacturing process

Inactive Publication Date: 2011-09-07
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The tailings itself is a soluble salt, which belongs to a bulk structure. The backfilling strength is low and the density is low. Direct backfilling will easily cause the collapse of the mine layer and affect the production and safety of the mining area. For this, we use the technical method of coagulation salt to effectively solve the problem of backfilling. question

Method used

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  • Coagulating salt for potassium salt solid mine backfilling and manufacturing method thereof
  • Coagulating salt for potassium salt solid mine backfilling and manufacturing method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A kind of coagulation salt manufacture method for potash solid mine backfill, such as figure 1 As shown, get 10.00kg of lightly burned powder roasted by magnesite, whose main content is active magnesium oxide, prepare 12.00kg of magnesium chloride saturated solution (specific gravity is 1.33), select the magnesium chloride saturated solution obtained in the potassium salt production process for use here, and take the tail 10.00kg of ore sodium chloride salt grains, 10.00Kg of magnesium chloride salt grains, wherein the grain diameter of sodium chloride salt grains is 8mm, and the grain diameter of magnesium chloride salt grains is 4mm. Stir the above solutions and materials evenly in a mixer, make a slurry, pour it into a template or a standard mold, and mold it at ambient temperature. After demolding, it is maintained at ambient temperature and air humidity less than 70% for 12 hours to become Coagulate salt and measure its mechanical properties.

[0020] Its main tec...

Embodiment 2

[0030] A method for producing coagulation salt for backfilling of potassium salt solid mines. Get 10.00kg of lightly burned powder roasted by magnesite, whose main content is active magnesium oxide, and prepare 8.00kg of magnesium chloride saturated solution (specific gravity is 1.35). Here, potassium salt is used For the magnesium chloride saturated solution obtained in the production process, 150.00 kg of tailings sodium chloride salt grains and 120.00 kg of magnesium chloride salt grains are taken. Stir the above solutions and materials evenly in the mixer, inject the slurry into the formwork or standard mold and form it at ambient temperature. Coagulate salt and measure its mechanical properties.

[0031] Its main technical indicators are as follows:

[0032] Density: 1320kg / m 3 ,

[0033] Compressive strength: 3.25MPa,

[0034] Flexural strength: 0.92MPa,

[0035] Axial compressive strength: 2.08MPa,

[0036] Axial tensile strength: 0.26MPa,

[0037] Static compres...

Embodiment 3

[0040] A method for producing coagulation salt for backfilling of potassium salt solid mines. Get 10.00kg of caustic dolomite powder half-roasted in dolomite ore, its main content is active magnesium oxide, and prepare 12.00kg of magnesium chloride saturated solution (specific gravity is 1.33). Here, magnesium chloride The hydrate is prepared by taking 10.00kg of tailings sodium chloride salt grains and 10.00Kg of magnesium chloride salt grains. Stir the above solutions and materials evenly in a mixer, make a slurry, pour it into a template or a standard mold, and mold it at ambient temperature. After demolding, it is maintained at ambient temperature and air humidity less than 70% for 12 hours to become Coagulate salt and measure its mechanical properties.

[0041] Its main technical indicators are as follows:

[0042] Density: 1960kg / m 3 ,

[0043] Compressive strength: 32MPa,

[0044] Flexural strength: 7.8MPa,

[0045] Axial compressive strength: 25.0MPa,

[0046] Ax...

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Abstract

The invention relates to a coagulating salt for potassium salt solid mine backfilling and a manufacturing method thereof. The manufacturing method comprises the following steps: 1. preparing a magnesium chloride saturated solution; 2. evenly mixing 1.00 part by mass of magnesium oxide, 0.80-1.20 parts by mass of magnesium chloride saturated solution, 1.00-15.00 parts by mass of sodium chloride particle in tailings and 1.00-12.00 parts by mass of magnesium chloride particle in tailings to form a slurry; 3. casting the slurry, and curing to form; and 4. curing at ambient temperature under the humidity of lower than 70% for 6-12 hours to obtain the coagulating salt. By manufacturing the coagulating salt with a certain strength from magnesium oxide and a great deal of tailings containing sodium and magnesium salts, the invention has the advantages of simple manufacturing process, low cost and wide sources of magnesium oxide, can maximally backfill the tailings into the mine, meets the requirement of safety in production, and solves the problem of pollution of tailings for the vegetation in the ambient environment as well as the problem of stacking of the tailings, thereby having favorable social benefit and economic benefit.

Description

technical field [0001] The invention relates to the field of chemical building materials, in particular to a potassium salt solid mine backfilling coagulation salt and a manufacturing method thereof. Background technique [0002] my country and surrounding countries and regions are rich in underground salt mine resources. At present, the development and utilization of its resources, especially the utilization of potash ore resources, is in the ascendant. However, with the extraction of potash ore, a large amount of sodium and magnesium salt tailings are accompanied. According to the requirements of clean production and environmental protection, most of the tailings will be backfilled underground, except for a part of comprehensive utilization. The underground backfill requires safety and reliability. The tailings itself is a soluble salt, which belongs to a bulk structure. The backfilling strength is low and the density is small. Direct backfilling will easily cause the colla...

Claims

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Application Information

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IPC IPC(8): C04B28/32C04B18/12
CPCY02W30/91
Inventor 肖学英张志宏王继东程怀德常成功张全有董茹董生发马艳芳
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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