Composite salt treatment and comprehensive utilization process of insoluble potassium-enriched minerals

A compound salt, potassium-rich technology, applied in the direction of aluminum sulfur compounds, carbonate preparations, sulfate/bisulfate preparation, etc., can solve the problems of long reaction cycle, low efficiency, complicated separation of impurities, high raw material cost, and achieve industrial The effect of broad chemical prospect, good environmental compatibility and lower production cost

Inactive Publication Date: 2015-03-25
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although there are a large number of technical developments and patents, most of the above-mentioned processes are difficult to achieve large-scale industrial production. Comprehensive analysis shows the following shortcomings: (1) energy consumption and material consumption are large, such as high-temperature sintering method, using Na 2 CO 3 / K 2 CO 3 The high-temperature sintering still has problems such as high cost of raw materials and complicated separation of impurities; (2) acid treatment due to high impurity content leads to high cost, severe equipment corrosion, and poor environmental compatibility, especially acid treatment containing fluoride , this problem is especially serious; (3) The tailings discharge problem is a difficult point in the acid process, and for the alkali process, the cost can be reduced because the silicon-calcium slag can by-produce Portland cement; (4) the current research is more The main disadvantage of the hydrothermal method is that the decomposition of potassium feldspar is not complete, and the product K 2 O has low nutrient content and strong alkaline (pH ≥ 10), long reaction cycle and low efficiency, making it difficult to realize large-scale industrial production

Method used

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  • Composite salt treatment and comprehensive utilization process of insoluble potassium-enriched minerals

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024]Mix 1000g of calcium sulfate and 400g of calcium carbonate with 100g of sodium nitrate to form a composite salt, mix it evenly with 1000g of potassium feldspar ore powder, control the roasting temperature at 1100°C, roast for 1.5h, and soak the roasted material in water for 4h, control the water The mass ratio to the raw ore is 6:1, and solid I and 5600mL liquid I are obtained after filtration. The content of Al in liquid I is 7367mg / L, the content of K is 11620mg / L, the content of Na is 3600mg / L, and the content of other impurities is less than 30mg / L.

[0025] Liquid I uses CO 2 After the pH was adjusted to 8.5, filtration and separation were carried out to obtain 119 g of solid II and 5540 mL of liquid II. The Al content in liquid II was 183 mg / L, and the separation of K and Al was achieved well.

[0026] Al content in solid II is 33.20%, converted into Al(OH) 3 The content is 95.5%, and the contents of other components are shown in Table 1; the solid II is passed t...

Embodiment 2

[0031] Mix 700g of calcium sulfate and 600g of calcium nitrate, and 110g of sodium silicate to form a composite salt, mix evenly with 1000g of potassium feldspar ore powder, control the roasting temperature at 1400°C, roast for 0.5h, and soak the roasted material in water for 2.5h. The mass ratio of water to raw ore is controlled to be 10:1, and solid I and liquid I are obtained after filtration.

[0032] Liquid I uses H 2 SO 4 After adjusting the pH to 5.5, filter and separate to obtain solid II and liquid II, and Al(OH) in solid II 3 The content is 85%, and the Al content in liquid II is 254mg / L.

[0033] Solid II uses Al(OH) 3 The typical process of production, that is, the Bayer method, the obtained Al(OH) 3 Preparation of sandy Al by roasting 2 o 3 ; Liquid II is processed by alcohol salting-out method (volume ratio of alcohol and liquid II is 0.6:1), centrifugal separation, drying and other processes to obtain K 2 SO 4 product, K 2 SO 4 K in the product 2 The ...

Embodiment 3

[0035] The composite salt of 1600g calcium sulfate, 250g calcium carbonate and 150g sodium sulfite is mixed evenly with 1000g potassium feldspar ore powder, the roasting temperature is controlled at 1450°C, roasted for 2h, and the roasted material is soaked in water for 1.5h (the mass ratio of water to raw ore 8:1), after filtration, solid I and 7800mL liquid I were obtained, and the analysis results of I liquid I are shown in Table 2.

[0036] Liquid I uses H 2 SO 4 After adjusting the pH to 8.0, filter and separate to obtain 132g of solid II and 7750mL of liquid II. The above separation process can separate Al and K very well. After analysis, Al(OH) in solid II 3 content>90%, Al content in liquid II is lower than 250mg / L.

[0037] Solid II is reacted with NaOH solution to control the Ke ratio to 1.3-1.6 and the carbon content to be 12h to obtain Al(OH) 3 Sandy Al was obtained after roasting 2 o 3 ; Liquid II is treated with alcohol salting-out method, the volume ratio o...

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Abstract

The invention discloses a composite salt treatment and comprehensive utilization process of insoluble potassium-enriched minerals. The process comprises the following steps: mixing insoluble potassium-enriched minerals with composite salt containing calcium salt and sodium salt, and then roasting at high temperature; performing water leaching on a roasted product, and then performing solid-liquid separation I to obtain a solid I and a liquid I, wherein the solid I is used for preparing aerated bricks or Portland cement additives, the liquid I is used for separating out precipitates by adjusting a pH value and is subjected to solid-liquid separation II to obtain a solid II and a liquid II, and the solid II is further prepared into Al2(SO4)3 or Al2O3; and preparing K2SO4 or K2CO3 by performing condensation crystallization or salt precipitation on the liquid II. According to the process disclosed by the invention, the insoluble potassium-enriched minerals are subjected to roasting treatment by the composite salt containing the calcium salt and sodium salt, and water leaching is combined to ensure that potassium, aluminum and silicon in the insoluble potassium-enriched minerals are fully separated, and meanwhile, aluminum products and potassium products with relatively high purity can be obtained; and by adopting the process, the comprehensive recovery and utilization of insoluble potassium-enriched mineral resources can be achieved.

Description

technical field [0001] The invention relates to a compound salt treatment and comprehensive utilization process of insoluble potassium-rich minerals, and belongs to the technical field of comprehensive utilization of insoluble potassium-rich mineral resources. Background technique [0002] The potassium-containing minerals of insoluble potassium-rich rocks are mainly microplagioclase, whose crystal chemical formula is K[AlSi 3 o 8 ], theoretical composition (mass fraction): SiO 2 64.7%, Al 2 o 3 18.4%, K 2 O 16.9%, triclinic system, crystal structure [Si(Al)O 4 ] Tetrahedrons link into four-membered rings. Therefore, the goal of comprehensive utilization of potassium-rich rocks is to destroy the structure of potassium feldspar with the lowest energy and to realize SiO 2 、Al 2 o 3 、K 2 O resource utilization of the three components, of which potassium is the most valuable. [0003] Although potassium is widely used, more than 90% of the world's potassium salt pro...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F7/02C01F7/74C01D5/06C01D7/02
Inventor 刘耀驰莫红兵
Owner CENT SOUTH UNIV
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