Method for preparing nitrogen, sulfur and potassium from polyhalite

A polyhalite and nitrogen-sulfur-potassium technology, which is applied in the field of nitrogen-sulfur-potassium compound fertilizer production, can solve problems such as the infeasibility of industrial production, and achieve the effects of low production cost, good water solubility, and low energy consumption

Inactive Publication Date: 2017-08-22
四川省冶金地质勘查局六0五队
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Problems solved by technology

However, industrial production is not feasible

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  • Method for preparing nitrogen, sulfur and potassium from polyhalite

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Embodiment Construction

[0022] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the embodiments and accompanying drawings.

[0023] like figure 1 As shown, the method for preparing nitrogen, sulfur, and potassium from polyhalite includes: grinding polyhalite into 120-mesh ore powder, heating it in a microwave oven (200°C) for 10 minutes, and then leaching it with a hot solution to carry out Solid-liquid separation, the liquid phase is K 2 SO 4 ,MgSO 4 solution, solid phase is CaSO 4 (Gypsum) product, the liquid phase is precipitated with 25% (wt) ammonia water to remove magnesium, and then filtered, the solid phase is Mg(OH) 2 , After calcination at 600°C, light MgO products can be obtained. The liquid phase was concentrated and crystallized by evaporation to obtain K 2 SO 4 ·(NH 4 ) 2 SO 4 Product, this product is nitrogen-sulfur-potassium ternary compound fer...

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Abstract

The invention discloses a method for preparing nitrogen, sulfur and potassium from polyhalite. The method comprises the following steps: crushing polyhalite ore powder and carrying out microwave-energy decomposition; subjecting the polyhalite ore powder having undergone microwave-energy decomposition to leaching with a hot solution and carrying out solid-liquid separation so as to obtain liquid-phase K2SO4, a MgSO4 solution and solid-phase CaSO4; subjecting K2SO4 and the MgSO4 solution to ammonia water precipitation so as to remove magnesium and carrying out filtering for separation so as to obtain solid Mg(OH)2 and liquid-phase K2SO4.(NH4)2SO4; calcining Mg(OH)2 at a temperature of 600 DEG C so as to obtain a MgO lightweight product; and subjecting liquid-phase K2SO4.(NH4)2SO4 to evaporative concentration and crystallization so as to obtain a K2SO4.(NH4)2SO4 product. Nitrogen-sulfur-potassium three-component fertilizer prepared in the invention has high fertilizer efficiency and good water solubility, can be rapidly absorbed by plants and is applicable to economic crops. The preparation method is simple in process flow, low in energy consumption, clean, environment friendly and low in production cost; and calcium, magnesium and potassium in polyhalite are overally recycled.

Description

technical field [0001] The invention relates to the technical field of preparing nitrogen, sulfur and potassium compound fertilizers, in particular to a method for preparing nitrogen, sulfur and potassium through polyhalite. Background technique [0002] Polyhalite (K 2 SO 4 · MgSO 4 2CaSO 4 2H 2 O) The molecular weight is 602, containing K 2 SO 4 28.9%, (K 2 O is 15.6%), CaO 18.6%, MgO 6.7%, SO 3 53.1%, H 2 O 6.0%, is a kind of double salt with low solubility. Important potassium minerals are widely produced in Sichuan Basin, Hubei Qianjiang Basin, Qinghai Qaidam Basin and Changqing Oilfield. The amount of polyhalite resources in the Sichuan Basin alone exceeds 100 billion tons, and the amount of resources is extremely rich. The polyhalite resources in Nongle, Qu County, Sichuan Province are buried relatively shallow. In the early 1970s, the Sichuan Building Materials Geological Exploration Brigade conducted exploration and obtained more than 5 million tons of ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C05G1/00C01F5/08
CPCC01F5/08C05C3/00C05D1/02
Inventor 邢智唐明林
Owner 四川省冶金地质勘查局六0五队
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