Process for disassembling phosphate ore by mixed acid and coproducing potassium dihydrogen phosphate, hydrogen phosphate and combined fertilizer

A technology for co-production of potassium dihydrogen phosphate and calcium hydrogen phosphate, applied in chemical instruments and methods, sulfate/bisulfate preparation, phosphorus compounds, etc. The effect of dealing with the problem

Inactive Publication Date: 2009-01-07
黄明科 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

By adopting the method of the invention, not only can the problem of impurity interference in the production of phosphate by using medium and low-grade phosphate rocks be successfully solved, but also the recovery rate of phosphorus pentoxide can be increased to close to 100%, various resources can be fully utilized, and the process can be simplified at the same time, reducing corrosion, simplify equipment, and receive good technical and economic effects

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  • Process for disassembling phosphate ore by mixed acid and coproducing potassium dihydrogen phosphate, hydrogen phosphate and combined fertilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0078] Embodiment 1: see Fig. 1.

[0079] Decomposing phosphate rock with mixed acid to produce calcium hydrogen phosphate and potassium dihydrogen phosphate comprises the following steps:

[0080] a, preparation of hydrogen chloride and potassium bisulfate:

[0081] In potassium bisulfate reaction tank 1, 16 tons of filtrate (KCl content 10%) after filtering calcium hydrogen phosphate in the input step e, add 11.9 tons of Repone K (the completion of batching contains 13.5 tons of Repone K in the slurry) , stir evenly and be prepared into a slurry containing 46% of potassium chloride. According to the mol ratio of sulfuric acid and Repone K is the ratio of 1: 1, in this potassium bisulfate reaction tank 1, add sulfuric acid (18.12 tons of sulfuric acid are added in total), stirring reaction. The reaction temperature is 60°C (without heating, the heat of reaction is achieved by itself).

[0082] The total amount of aqueous solution of potassium hydrogensulfate after the reac...

Embodiment 2

[0093] Embodiment 2: see Fig. 1.

[0094] A method for decomposing phosphate rock with mixed acid to co-produce potassium dihydrogen phosphate, calcium hydrogen phosphate and compound fertilizer, comprising the following steps:

[0095] a, preparation of hydrogen chloride and potassium bisulfate:

[0096] Get sulfuric acid and Repone K in the ratio of 1:1 by molar ratio; In potassium bisulfate reaction tank 1, water and Repone K are mixed and mixed with Repone K and the weight percentage composition that makes Repone is 40% slurry and stir Evenly, then add sulfuric acid, stir and react for 1 hour to obtain an aqueous solution of hydrogen chloride gas and potassium hydrogensulfate;

[0097] b. Phosphate rock absorbs hydrogen chloride for acidolysis reaction:

[0098] Get phosphate rock powder and water by the mass ratio of phosphate rock powder: water=1: 1, in hydrochloric acid decomposition reaction tank 2, phosphate rock powder and water are mixed and stirred into slurry, a...

Embodiment 3

[0114] Embodiment 3: see Fig. 1.

[0115] A method for decomposing phosphate rock with mixed acid to co-produce potassium dihydrogen phosphate, calcium hydrogen phosphate and compound fertilizer, comprising the following steps:

[0116] a, preparation of hydrogen chloride and potassium bisulfate:

[0117] Take sulfuric acid and Repone K in a ratio of 1:1 by molar ratio; in potassium bisulfate reaction tank 1, water and Repone Repone are mixed and prepared into a slurry that is 70% by weight of Repone Repone and stirs Evenly, then add sulfuric acid, stir and react for 4 hours to obtain an aqueous solution of hydrogen chloride gas and potassium bisulfate;

[0118] b. Phosphate rock absorbs hydrogen chloride for acidolysis reaction:

[0119] Get phosphate rock powder and water by the mass ratio of phosphate rock powder: water=1:3, in hydrochloric acid decomposition reaction tank 2, phosphate rock powder and water are mixed and stirred into slurry, absorb hydrogen chloride gas, ...

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Abstract

A method for the joint production of monopotassium phosphate, calcium hydrophosphate and compound fertilizers through by subjecting phosphorite to mixed acid resolution is characterized in that the method comprises the steps of taking sulphuric acid and potassium chloride to prepare chlorine hydride and acid potassium sulfate; conducting acidolysis reaction after phosphorite slurry absorbs chlorine hydride; preparing monopotassium phosphate through the reaction between an acidolysis filtrate and calcium oxide and lemery; agitating a mixture of the acidolysis fitrate with monopotassium phosphate crystallization mother liquor to neutralize and prepare calcium hydrophosphate; preparing recycle acid through the reaction between the acidolysis filtrate with sulphuric acid; preparing full water-solubility compound fertilizers through the reaction between recycle acid and an acid potassium sulfate solution and ammonium hydrogen carbonate or ammonia, etc. The method can successfully solve the impurity interference problem in the production of phosphate by using phosphorite of middle-low grade, and increase the reclaim rate of phosphorus pentoxide to approximate 100%. The method has the advantages of fully utilizing resources, simplifying process and devices, reducing corrosion, saving energy, reducing acid consumption and cost, eliminating pollution, and achieving good technical and economic effects.

Description

technical field [0001] The invention belongs to a method for preparing phosphorus compounds, calcium compounds and inorganic fertilizers by treating phosphate ore, and relates to a method of using mixed acid to decompose phosphate ore to co-produce potassium dihydrogen phosphate (or sodium dihydrogen phosphate), calcium hydrogen phosphate and compound fertilizer production method. It is suitable for using sulfuric acid and hydrochloric acid to decompose phosphate rock, especially medium and low-grade phosphate rock, to directly produce fine phosphate (potassium dihydrogen phosphate, sodium dihydrogen phosphate, etc.), calcium hydrogen phosphate and fully water-soluble sulfur-based compound fertilizers. Background technique [0002] In the prior art, the production of fine phosphate generally adopts hot process phosphoric acid or wet process phosphoric acid. At present, the production technology of fine phosphate generally uses thermal phosphoric acid; because the phosphate ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/01C01D5/06C01B25/30C01B25/32C05G1/00
Inventor 黄尚勋黄明科
Owner 黄明科
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