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Method for preparing water-soluble sylvite from deep polyhalite in in-situ reaction mode

A polyhalite ore and in-situ reaction technology, which is applied in earth square drilling, wellbore/well components, mining fluids, etc., can solve the problem of large-scale extraction of potassium in deep polyhalite mines, difficulty in crushing, and daily outflow Small volume and other problems, to avoid processing problems, simple process, large injection volume effect

Active Publication Date: 2013-09-25
SICHUAN BESTRED MINING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The method described in this document not only has the problem that it is difficult and difficult to implement in-situ crushing of deep-buried polyhalite ore, but also the obtained solution K + The concentration is low, and the daily outflow is extremely small, so it is difficult to achieve large-scale extraction of potassium for deep polyhalite deposits

Method used

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  • Method for preparing water-soluble sylvite from deep polyhalite in in-situ reaction mode

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] A simulated test for in-situ reaction of polyhalite ore with a buried depth of 2800m (the ground temperature is about 90°C and the ground pressure is about 28MPa) to prepare water-soluble potassium salts, which includes the following steps:

[0032] The simulated test was carried out with Dalong polyhalite ore in Guang'an, Sichuan. The ore K 2 O content is 12.64wt%;

[0033] (1) Use 0.5wt% HCl aqueous solution as the reaction solution.

[0034] (2) Put 200g of dense massive polyhalite ore into a high-temperature and high-pressure reaction kettle, and add 500ml of reaction solution to ensure that the reaction solution is completely soaked in polyhalite ore.

[0035] (3) Use a high-temperature and high-pressure reactor to simulate the deep underground ground temperature and ground pressure conditions, set the reaction temperature to 90°C, and the reaction pressure to 28MPa.

[0036] (4) Heat and pressurize to the set temperature and pressure conditions, let it stand for...

Embodiment 2

[0042] A simulated test for in-situ reaction of polyhalite ore with a buried depth of 2000m (the ground temperature is about 70°C and the ground pressure is about 20MPa) to prepare water-soluble potassium salt, the steps are as follows:

[0043] (1) The ore of the Wusheng Wanshan polyhalite mine in Guang'an was tested, and the ore K 2 The O content is 11.38 wt%.

[0044] (2) The NaOH aqueous solution with a concentration of 5 wt% was used as the reaction solution.

[0045] (3) Put 200g of dense massive polyhalite ore into a high-temperature and high-pressure reaction kettle, and add 500ml of reaction solution to ensure that the reaction solution completely soaks the polyhalite ore.

[0046] (4) Use a high-temperature and high-pressure reactor to simulate the deep underground ground temperature and ground pressure conditions, set the reaction temperature to 70°C, and the reaction pressure to 20MPa.

[0047] (5) Heat and pressurize to the set temperature and pressure condition...

Embodiment 3

[0053] A simulated test for in-situ reaction of polyhalite ore with a buried depth of 1000m (the ground temperature is about 45°C and the ground pressure is about 10MPa) to prepare water-soluble potassium salts. The steps are as follows:

[0054] (1) The ore of Nongle polyhalite ore in Quxian County, Sichuan Province was tested, and the ore K 2 The O content is 12.83 wt%.

[0055] (2) With a concentration of 5 wt% H 2 SO 4 The aqueous solution is the reaction solution.

[0056] (3) Put 200g of dense massive polyhalite ore into a high-temperature and high-pressure reaction kettle, and add 500ml of reaction solution to ensure that the reaction solution completely soaks the polyhalite ore.

[0057] (4) Use a high-temperature and high-pressure reactor to simulate the deep underground ground temperature and ground pressure conditions, set the reaction temperature to 45°C, and the reaction pressure to 10MPa.

[0058] (5) Heating and pressurizing to the set temperature and pressu...

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Abstract

The invention relates to a method for preparing water-soluble sylvite from a deep polyhalite seam in an in-situ reaction mode. The method for preparing the water-soluble sylvite from deep polyhalite in the in-situ reaction mode is characterized by comprising the following steps of: (1) preparing a reaction solution with certain concentration; (2) filling the reaction solution into the deep polyhalite seam, and enabling the reaction solution to contact with polyhalite; (3) standing and reacting, prompting the reaction solution to react with the polyhalite by using conditions of earth temperature and earth pressure, so as to generate water-soluble sylvite, and dissolving the water-soluble sylvite into a water solution so as to form a potassium-containing solution; (4) pulling out the potassium-containing solution from the seam; (5) filtering the potassium-containing solution and preparing the sylvite. By using the method, water-soluble sylvite is prepared from deep polyhalite in situ in large scale, the process is simple, the cost is low, the energy is saved and the environment is protected.

Description

technical field [0001] The invention relates to a method for preparing water-soluble potassium salt by in-situ reaction of deep polyhalite ore. Background technique [0002] Polyhalite (K 2 SO 4 · MgSO 4 2CaSO 4 2H 2 O) is an insoluble potassium-magnesium sulfate mineral whose K 2 The theoretical content of O is 15.62wt%, which is an important potassium resource. It is known in the literature to dissolve polyhalite ore in water after calcination or to mix polyhalite with acid (such as HNO 3 etc.) or react with salt to prepare potassium salt or compound potassium fertilizer, for example, U.S. Patents 1,946,068 and 4,246,019 disclose the use of HNO 3 A method for processing polyhalite to prepare potassium salt; Russian patent 2,276,123 discloses a method of using HNO 3 Reaction with polyhalite followed by neutralization with ammonia to prepare K-containing 2 SO 4 , MgSO 4 and NH 4 NO 3 The method of the mixture solution; U.S. Patent 2,138,827 discloses the method ...

Claims

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Application Information

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IPC IPC(8): E21B43/00
Inventor 张红张晗江
Owner SICHUAN BESTRED MINING
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