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Novel process for cleanly producing phosphate ammoniate fertilizer in the processing of phosphate rock powder

A technology of phosphate rock powder and process, applied in ammonium orthophosphate fertilizer, phosphate fertilizer, ammonium sulfate and other directions, can solve problems such as land occupation and environmental pollution

Active Publication Date: 2010-02-10
BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Since the phosphorus in phosphate rock powder exists in the form of calcium phosphate, it is necessary to use a large amount of sulfuric acid to dissolve dilute phosphoric acid and produce a large amount of phosphogypsum by-product. The resulting dilute phosphoric acid is then neutralized with ammonia gas and concentrated to synthesize monoammonium phosphate and phosphoric acid Diammonium, a large amount of phosphogypsum has no effective treatment method, causing a large amount of land occupation and environmental pollution, only a small amount is used for cement addition

Method used

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  • Novel process for cleanly producing phosphate ammoniate fertilizer in the processing of phosphate rock powder

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] A. Pretreatment of phosphate rock powder: firstly, the finely ground P 2 o 5 Mix 26g of phosphate rock powder with a content of 21.33% and 60g of water, add 6-10g of dilute phosphoric acid with a concentration of 20% for pretreatment, heat at the same time, and stir for 10 minutes to obtain pretreated pulp, which is to be acidolyzed.

[0039] B. One-time acid hydrolysis treatment: 13g of concentrated sulfuric acid with a concentration of 98% was added dropwise in 10 minutes with the above pulp under stirring, and then 11.7g of ammonium sulfate solid was added in a one-time feeding method, and the temperature was raised to keep the reaction in a slightly boiling state The reaction was carried out for 5 hours, the condensing tube kept the liquid reflux, and the generated HF gas was treated with lye for tail gas absorption. The reaction slurry was sampled and centrifuged to analyze the P in the supernatant and solid waste residue. 2 o 5 content. The reaction phosphorus...

Embodiment 2

[0045] A, phosphate rock powder pretreatment: with embodiment one.

[0046] B, one-time acid hydrolysis treatment: with the above-mentioned ore pulp in a stirring state, 13g of concentrated sulfuric acid with a concentration of 98% was added dropwise in 10 minutes, reacted for 3 hours in a slightly boiling state, then added 11.7g of ammonium sulfate solid, and then React in boiling state for 2 hours, keep the liquid reflux in the condenser tube, and the generated HF gas is treated with lye for tail gas absorption. The reaction slurry was sampled and centrifuged to analyze the P in the supernatant and solid waste residue. 2 o 5 content. The reaction phosphorus release rate can reach 40-50%.

[0047] C, centrifugal treatment: with embodiment one.

[0048] D, secondary acid hydrolysis treatment: with embodiment one.

[0049] E, slurry filtration: with embodiment one.

[0050] F, the extraction of sulfate radical and the synthesis of calcium carbonate: with embodiment one. ...

Embodiment 3

[0052] A, phosphate rock powder pretreatment: with embodiment one.

[0053] B. Primary acid hydrolysis treatment: Add 30 g of ammonium bisulfate solid to the above-mentioned ore pulp under stirring, and react for 5 hours in a slightly boiling state. The condensing tube keeps the liquid reflux, and the generated HF gas is treated with lye for tail gas absorption. The reaction slurry was sampled and centrifuged to analyze the P in the supernatant and solid waste residue. 2 o 5 content. The reaction phosphorus release rate can reach 29-35%.

[0054] C, centrifugal treatment: with embodiment one.

[0055] D, secondary acid hydrolysis treatment: with embodiment one.

[0056] E, slurry filtration: with embodiment one.

[0057] F, the extraction of sulfate radical and the synthesis of calcium carbonate: with embodiment one.

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Abstract

The invention provides a novel process for producing a byproduct of phosphate ammoniate fertilizer in the processing of phosphate rock powder and discloses a clean production method for producing calcium carbonate in ardealite processing. The novel process can solve two problems of high cost of phosphate rock powder processing and difficult processing of the ardealite of the conventional sulfuricacid method. Compared with the production method adopted by conventional phosphate plants, the process makes innovations in process and engineering aspects, thereby improving phosphorus release rate,greatly reducing consumption of sulfuric acid, and producing the widely used and cheap byproduct of calcium carbonate while producing ammonium phosphate, ammonium dihydrogen phosphate and ammiaonia sulfate. The novel process for producing phosphate ammoniate fertilizer in the processing of phosphate rock powder create good economic benefits and social environmental protection benefits and meets requirements for clean production, cyclic economy, energy conservation and low energy consumption.

Description

technical field [0001] The present invention has developed a clean production process using phosphate rock powder as raw material, using ammonium sulfate instead of liquid ammonia and part of sulfuric acid to synthesize ammonium phosphate salts in one pot, and proposes to use carbon dioxide and ammonia or ammonium bicarbonate to treat phosphogypsum to synthesize ammonium sulfate. A new process for resource recycling of by-product calcium carbonate. Background technique [0002] At present, there are mainly two process routes for treating phosphate rock powder, the sulfuric acid method and the hydrochloric acid method, and the former is the main one. Since the phosphorus in phosphate rock powder exists in the form of calcium phosphate, it is necessary to use a large amount of sulfuric acid to dissolve dilute phosphoric acid and produce a large amount of phosphogypsum. The dilute phosphoric acid produced is then neutralized with ammonia gas and concentrated to synthesize monoa...

Claims

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Application Information

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IPC IPC(8): C01B25/28C05B7/00C01B25/18C01F11/46C01F11/18C01C1/24
Inventor 田莹莹尹应武
Owner BEIJING ZIGUANG YINGLI CHEM TECH CO LTD
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