Method for exploitation and utilization of polyhalite-halite accompanying mineral deposit

A technology of polyhalite and halite, which is applied in the field of mining and utilization of polyhalite-halite associated deposits, can solve problems such as ineffective utilization, deep burial, and insoluble potassium salt components, etc., so as to reduce mining costs, The effect of high yield, high yield and high purity

Active Publication Date: 2014-02-26
DAZHOU HENGCHENG ENERGY GROUP
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Problems solved by technology

As for the deeply buried polyhalite and halite associated deposits, due to its deep burial and the insoluble characteristics of high-value potassium salt components, the

Method used

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  • Method for exploitation and utilization of polyhalite-halite accompanying mineral deposit

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Embodiment 1

[0044] The fresh water is continuously pumped into the inlet end of the polyhalite and halite-associated deposit dissolution well group wells, and at the same time, the dissolved brine is continuously collected from the outlet end. According to the mensuration of sodium ion and potassium ion content in polyhalite and halite associated ore deposit, after obtaining the content of sodium ion and potassium ion, after guaranteeing Na + Under the premise of saturation, the concentration of potassium ions should be increased as much as possible, and the amount of injected water should be calculated according to this principle. After injecting water, control the leaching time for 15 days, at which time the brine Na + Concentration 110g / l, K + Concentration 8g / l. Add 10% lime emulsion made of water under stirring condition to precipitate Mg in brine 2+ , the temperature of the solution during precipitation is 40°C, the pH of the precipitation end point is controlled at 10.0, the pre...

Embodiment 2

[0050] The fresh water is continuously pumped into the inlet end of the polyhalite and halite-associated deposit dissolution well group wells, and at the same time, the dissolved brine is continuously collected from the outlet end. According to the Na in the leaching brine + with K + concentration to determine the injection water flow rate, and control the leaching time for 25 days, at which time the leaching brine Na + Concentration 110g / l, K + Concentration 12g / l. Add 15% lime emulsion made of water under stirring condition to precipitate Mg in brine 2+ , the temperature of the solution during precipitation is 60°C, the pH of the precipitation end point is controlled at 10.4, the precipitation is filtered, and then a sodium carbonate solution with a saturation of 60% is added to the supernatant of the filtered precipitation to precipitate calcium. The molar ratio of the amount of sodium carbonate added to calcium The ratio is 1.5:1, the precipitation temperature is 60°C,...

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Abstract

The invention provides a method for exploitation and utilization of a polyhalite-halite accompanying mineral deposit. The method comprises the steps of injecting fresh water into the polyhalite-halite accompanying mineral deposit to leach out a brine stock solution of which the sodium ion concentration is more than 79g/L and the potassium ion concentration is more than 4g/L; enabling the brine stock solution to react with a lime emulsion, filtering and then adding a sodium carbonate solution to obtain purified brine; concentrating the purified brine by evaporating, and controlling the concentration of sulfate ions to be more than 20g/L to obtain crude sodium chloride and concentrated brine; freezing the concentrated brine to obtain coarse nitrate and a frozen nitrate stock solution; concentrating the frozen nitrate stock solution through vacuum evaporation, and controlling the potassium ion concentration to be more than 80g/L to obtain crude sodium chloride and a salt manufacturing stock solution; cooling the salt manufacturing stock solution to obtain crude potassium chloride and a separated potassium stock solution. The method provided by the invention is reasonable in process and ensures that the accompanying mineral deposit is subjected to maximized utilization. The method is simple in operation, low in cost and high in yield, and not only reduces the exploitation cost of polyhalite, but also realizes the comprehensive utilization of resources.

Description

technical field [0001] The invention relates to the field of ore deposit mining, in particular to a method for mining and utilizing polyhalite-halite associated ore deposits. Background technique [0002] Polyhalite is a widely distributed insoluble sulfate-type potassium ore, and its theoretical potassium content is as high as 12.8%. The dissolution rate of ions in polyhalite is slow and the equilibrium concentration of potassium ions is low. Through experiments, An Lianying and others measured the liquid phase K of polyhalite in fresh water at 25°C, 50°C, and 75°C. + The dissolved equilibrium concentrations are: 19.13g / l, 22.30g / l, 36.78g / l. To achieve such a result, more stringent conditions are required: finer particle size, higher solid-liquid ratio, etc. Due to the insoluble characteristics of polyhalite, the current development of polyhalite is limited to the direct mining of a single ore body on the surface or shallow layer. The methods of crushing, roasting, and ...

Claims

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Application Information

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IPC IPC(8): C01D3/08C01D5/00
Inventor 唐兵安普伟王思相
Owner DAZHOU HENGCHENG ENERGY GROUP
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