A process for preparing potassium fertilizer from potassium feldspar decomposition mother liquor by adsorption method

Abstract

The invention discloses a technology for preparing a potash fertilizer from potassium feldspar-decomposed mother liquor employing an adsorption method. The technology comprises the following steps: (1) grinding the potassium feldspar into -100 to -400 meshes; (2) evenly mixing with a strong alkali liquid after grinding potassium feldspar minerals, and then carrying out hydrothermal reaction inside a high-pressure container; (3) adding water to leach, agitating for 0.5-24 hours and carrying out solid-liquid separation; (4) adding zeolite which is equal to 0.2-1fold of the mass of the potassium feldspar, and agitating for 0.5-4 hours, so as to separate out potassium ions by zeolite adsorption; (5) adding the zeolite adsorbed with the potassium ions in the step (4) to an inorganic acid or a sodium salt liquid, agitating for 1-24 hours, and then carrying out solid-liquid separation; (6) cleaning a solid phase by clean water twice, and baking at 100-300 DEG C for 0.5-4 hours to recycle; and (7) evaporating and crystallizing the liquid phase obtained in the step (5), so as to prepare a qualified potash fertilizer. By adopting the technology, the potassium feldspar is decomposed at a high temperature, energy consumption is reduced, and the technology is short in technological process, simple in equipment, low in investment and low in production cost.

Description

technical field [0001] The invention relates to a process for preparing potassium fertilizer from potassium feldspar decomposing mother liquor, in particular to a process for preparing potassium fertilizer from potassium feldspar decomposing mother liquor by an adsorption method. Background technique [0002] Potassium salt resources in my country are poor, but potassium feldspar resources are abundant, widely distributed, large reserves, and high potassium content, generally greater than 10% (calculated as potassium oxide), is an ideal raw material for comprehensive utilization of potassium salt production. Potassium feldspar is a Si~AL~O framework structure, and its molecular formula is K[AlSi 3 o 8 ], its composition is a network structure, extremely stable, and is hardly decomposed by acid and alkali under normal temperature and pressure. Therefore, the development and utilization of potassium feldspar is limited. [0003] At present, a large number of literatures have...

AI Technical Summary

Problems solved by technology

Potassium feldspar is a Si~AL~O framework structure, and its molecular formula is K[AlSi 3 o 8 ], its composition is a network structure, extremely stable, almost not decomposed by acid and alkali under normal temperature and pressure, therefore, the development and utilization of potassium feldspar is limited

[0003] At present, a large number of literatures have introduced the development and utilization of potassium feldspar. The more classic methods of decomposing potassium feldspar are high-temperature calcination, ion exchange, hydrofluoric acid decomposition, etc., but because these methods all have high process energy consumption, Serious pollution, high economic cost, complicated process and other defects cannot be applied in industry