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Recycling and Utilization Method of Industrial Phosphogypsum Waste Residue

A phosphogypsum recycling technology, applied in the preparation of calcium/strontium/barium oxide/hydroxide, sulfate/bisulfate, etc., can solve the problem of impossible to realize the recycling and effective utilization of industrial phosphogypsum waste residue Problems such as low chemical purity and unindustrial phosphogypsum waste residue for large-scale production of potassium sulfate

Active Publication Date: 2017-01-25
济宁理工思源商务服务有限公司
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AI Technical Summary

Problems solved by technology

(5) the chemical composition of industrial phosphogypsum is very complicated, far from being as simple as only converting gypsum, the K of the prior art 2 SO 4 The chemical purity is too low, and the product application value is low
[0008] Therefore, the above-mentioned prior art is just an empty talk, and it is impossible to realize large-scale production of potassium sulfate from industrial phosphogypsum waste residue, and it is impossible to realize resource recovery and effective utilization of industrial phosphogypsum waste residue

Method used

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Examples

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Comparison scheme
Effect test

Embodiment

[0207] (1) Separation and recovery of phosphogypsum waste residue:

[0208] Phosphogypsum waste residue mainly includes: CaSO 4 2H 2 O, SiO 2 、H 3 PO 4 , Limonite FeO(OH) nH 2 O and apatite Ca 5 F(PO 4 ) 3 , and a small amount of calcium fluoride and a small amount of water-soluble sodium fluoride; for this waste residue, under vacuum conditions, at room temperature or heated and stirred, dehydrated and dried, and then filter large particles of apatite and phosphorus with a 50-100 mesh screen Limestone is recycled in the production of industrial ammonium dihydrogen phosphate:

[0209] 1. At room temperature, add the phosphogypsum waste residue to the gypsum CaSO 4 Slight excess of concentrated sulfuric acid H 2 SO 4 and SO 3 , stirring reaction, rotating speed 50 rev / min-150 rev / min,

[0210] The reaction time is 8 hours-24 hours; the gypsum generates Ca(HSO 4 ) 2 ;It can be properly heated to 40°C--50°C to speed up the reaction; Reaction formula:

[0211] CaSO...

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Abstract

The invention discloses a resource recycling method of industrial phosphogypsum waste residues and relates to the technical field of inorganic chemical industry. The method comprises the following steps: carrying out a reaction on gypsum calcium sulfate and concentrated sulfuric acid to generate calcium hydrogen sulfate; carrying out a reaction on calcium hydrogen sulfate which is 1 time and a sodium hydroxide NaOH or potassium hydroxide KOH aqueous solution which is 4 times; filtering or precipitating and separating to recover calcium hydroxide, limonite, silicic acid and calcium fluoride and CaHPO4; and obtaining sodium sulfate / potassium sulfate, sodium aluminate or potassium aluminate and calcium acetate Ca(CH3COO)2. The method is mainly applied to resource recycling of industrial phosphogypsum waste residues.

Description

[0001] Technical field: [0002] The invention relates to the technical field of inorganic chemical industry, in particular to a resource recycling method for industrial phosphogypsum waste residue. [0003] Background technique: [0004] In the production of existing industrial ammonium dihydrogen phosphate (monoammonium phosphate), a large amount of phosphogypsum waste residue will be produced, and the waste residue output is the same as that of the target product NH 4 h 2 PO 4 The ratio is as high as 1.9:1, and the annual output of phosphogypsum waste residue in my country is as high as 2 million tons or more, causing huge waste of resources and environmental pressure. However, there is no effective method for resource recovery and utilization of phosphogypsum waste residue in the prior art. Phosphogypsum waste residue mainly includes: gypsum CaSO 4 2H 2 O, limonite FeO(OH) nH 2 O, SiO 2、 In addition, the above-mentioned waste residue also includes about 1% of larger p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01F11/02C01D5/06
Inventor 耿兆翔
Owner 济宁理工思源商务服务有限公司
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