Acidolysis method of magnesium-containing phosphate rock

A technology of phosphate rock and acid hydrolysis, which is applied in the direction of ammonium sulfate, chemical instruments and methods, phosphorus compounds, etc., and can solve the problem of high manufacturing cost

Active Publication Date: 2013-11-20
武善东 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Magnesium Ammonium Phosphate MgNH 4 PO 4 It is obtained by the action of magnesium salt solution and ammonium phosphate solution, and the manufacturing cost is relatively high. This long-acting fertilizer component is contained in the current ammonium phosphate products

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  • Acidolysis method of magnesium-containing phosphate rock

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Embodiment 2

[0095] Beneficial effects of the present invention:

[0096] 1, the main idea of ​​the present invention is to make full use of the chemical energy that acid has and the advantage of existing phosphide processing technology, no matter with HCl, HNO 3 、H 3 PO 4 、H 2 SO 4 Or mixed acid can decompose magnesium-containing phosphate rock into relatively pure Ca(H 2 PO 4 ) 2 ·H 2 O crystals, calcium becomes high-purity industrial filler CaSO 4 Or calcium sulfate whiskers, fluorine becomes pure fluorosilicate, magnesium becomes ammonium magnesium phosphate, and the raw materials used in acid-lysis phosphate rock are completely recycled. Under the premise of eradicating the "three wastes", the theoretical utilization rate of raw materials is 100%, forming An independent new process of acid hydrolysis of phosphate rock including high-magnesium phosphate rock has been established.

[0097] 2. The focus of the present invention is to turn magnesium ions into a controllable param...

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Abstract

The invention discloses an acidolysis method of magnesium-containing phosphate rock. The method provided by the invention is characterized by comprising the following steps of: carrying out acidolysis on the magnesium-containing phosphate rock to obtain a water-soluble calcium, magnesium and phosphoric acid containing acidolysis solution, carrying out acidolysis on the phosphate rock by using the generated phosphoric acid to generate Ca(H2PO4)2.H2O solid, performing a reaction between H2SO4 and water-soluble calcium to generate high-pureness calcium sulfate whisker, and performing a reaction between water-soluble magnesium and phosphor in the acidolysis solution and NH3 to generate character separation magnesium ions of a MgNH4PO4 solid so as to realize complete high-efficiency comprehensive utilization of the acidolyzed magnesium-containing phosphate rock. The focus of the invention is to change magnesium ions into controllable parameters which are beneficial to circulation of the acidolysis solution. The magnesium-containing phosphate rock can be efficiently utilized, and also the compound magnesium ammonium phosphate can be used to realize the separation of phosphor magnesium from a circulation medium HCl or HNO3 or CaCL, Ca(NO3)2, thus realizing the combination and combined production with a present ammonium phosphate and phosphor product processing technology. The method provided by the invention has advantages of concise technology, less investment, low energy consumption, low cost, high benefit and no discharge of ''three wastes (waste gas, wastewater and industrial residue)'', and fully presents great business value and great resource value of the high magnesium-containing phosphate rock.

Description

Technical field: [0001] The invention relates to a method for acid-decomposing phosphate rock, more precisely, an acid-decomposing method for high-benefit and comprehensive utilization of magnesium-containing phosphate rock. Background technique: [0002] In inventor's disclosed " method of acid hydrolyzing phosphate rock " (publication number CN1962421A), its technical scheme comprises the following steps: [0003] a. React with acid and phosphate rock to generate an acid solution containing water-soluble calcium and phosphoric acid; the acid contains HCl or HNO 3 , or H 3 PO 4 , or a mixed acid composed of any proportion of the three; HCl includes H 2 SO 4 The HCl gas generated by the reaction with KCl or NaCl is absorbed into the HCl solution by the acid solution. [0004] b. Separate the acidolysis solution, react with phosphoric acid in the acidolysis solution with a phosphorus-containing compound, and generate a compound containing Ca(H 2 PO 4 ) 2 ·H 2 O cryst...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B25/32C01B25/45C01F11/46C01C1/24
Inventor 武善东武征张建华武善斌
Owner 武善东
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