Potassium nitrate and ammonium chloride co-production process

Abstract

The invention discloses a potassium nitrate and ammonium chloride co-production process, which comprises nine work procedures of raw material preparation, potassium nitrate crystallization, potassiumnitrate separation, potassium nitrate drying packaging, ammonium chloride evaporation, ammonium chloride crystallization, ammonium chloride separation, a circulation water system and an air pressure system, wherein in the raw material preparation work procedure, an ammonium nitrate unloading pump is connected with an ammonium nitrate tank car for pumping an ammonium nitrate solution into an ammonium nitrate solution groove; through the potassium nitrate crystallization work procedure, primary and secondary potassium nitrate and crystallization devices are connected with a primary steam sprayerand a vacuum pump for vacuum temperature reduction; annular spray heads additionally added above flow guide tubes in the middles of the primary and secondary potassium nitrate crystallization devices; a water inlet of the annular spray head is connected with a hot water pipe; in the ammonium chloride separation work procedure, a clean liquid pipe is used for communicating the upper part of an ammonium chloride thickening device A and an ammonium chloride thickening device B; a liquid outlet of the ammonium chloride thickening device B is connected with an ammonium chloride clean liquid tank.The invention provides the potassium nitrate and ammonium chloride co-production process with the advantages that the safety performance is high; the energy consumption is low; the production period is short; the product quality is high.

Description

technical field [0001] The invention relates to the technical field of inorganic chemical product production, in particular to a potassium nitrate and ammonium chloride co-production process. Background technique [0002] At present, the domestic method for producing potassium nitrate mainly adopts ammonium nitrate and potassium chloride double decomposition method, and the existing technology of this double decomposition reaction production potassium nitrate mainly has the following defects: 1, most of the enterprises producing potassium nitrate by double decomposition method adopt solid ammonium nitrate , need to add water to dissolve before the metathesis reaction, solid ammonium nitrate has explosive characteristics, low safety factor, and the storage and transportation of solid ammonium nitrate are very difficult, which increases the cost of storage and transportation; 2, the existing nitric acid At present, the potassium crystallization section generally adopts a three...

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Problems solved by technology

[0002] At present, the domestic method for producing potassium nitrate mainly adopts ammonium nitrate and potassium chloride double decomposition method, and the existing technology of this double decomposition reaction production potassium nitrate mainly has the following defects: 1, most of the enterprises producing potassium nitrate by double decomposition method adopt solid ammonium nitrate , need to add water to dissolve before the metathesis reaction, solid ammonium nitrate has explosive characteristics, low safety factor, and the storage and transportation of solid ammonium nitrate are very difficult, which increases the cost of storage and transportation; 2, the existing nitric acid At present, the potassium crystallization section generally adopts a three-stage steam ejector to vacuum-cool the potassium nitrate crystallizer. The principle of the steam ejector is to use steam as the working fluid to suck the low-pressure fluid to form a vacuum in the equipment, so that there is a need to consume A large amount of cooling water and steam cause the disadvantage of high energy consumption; 3. The diversion barrel inside the existing potassium nitrate crystallizer is easy to agglomerate, which seriously affects normal production; 4. The two parts in the existing ammonium chloride separation section The ammonium chloride thickener A and B are disconnected in the middle, and the ammonium chloride crystal slurry from the previous section first enters the ammonium chloride thickener A, and after standing still for a period of time, open the ammonium chloride centrifuge A for Solid-liquid separation work; then the potassium chloride crystal slurry enters the ammonium chloride thickener B first, and after standing still for a period of time, the ammonium chloride centrifuge B is turned on for solid-liquid separation. The two ammonium chloride thickeners are Repeated cycle work, so there is frequent start-up of ammonium chloride centrifuges A and B, high energy consumption, large equipment wear, troublesome operation, short static time of ammonium chloride crystal slurry, poor solid-liquid separation effect, and poor product quality Shortcomings

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