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A kind of method utilizing phosphogypsum to produce α-hemihydrate gypsum

A technology of hemihydrate gypsum and phosphogypsum, applied in chemical instruments and methods, inorganic chemistry, calcium/strontium/barium sulfate, etc., can solve the problems of no industrial value and high processing cost, shorten the conversion time and increase the ionic strength , the effect of increasing the conversion rate

Active Publication Date: 2022-05-03
HUBEI GUOCHUANG HI TECH MATERIAL +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods have high processing costs and have no industrial value

Method used

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  • A kind of method utilizing phosphogypsum to produce α-hemihydrate gypsum

Examples

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Effect test

Embodiment 1

[0027] Weigh 1kg of phosphorus gypsum, add 1kg of tap water, and mix into a homogeneous slurry. Transferred into the rod mill, the grinding is 5min, and the grinding fineness is determined to be -200 mesh 90%. Thick to 50% phosphogypsum concentration, transferred to the cyclone, adjust the stirring speed of 60r / min, inlet water velocity of 10mL / min to separate the upper foam slurry overflow. After the foam overflow is completed, adjust the stirring speed to 300r / min, the inlet water speed is 50mL / min, open the middle valve of the cyclone to flow out of the phosphogypsum solution until the outflow liquid has a solid content of 10%. The foam liquid was filtered to obtain organic matter and dried to 60.4g; the phosphogypsum solution was filtered to obtain pretreated phosphogypsum, which was naturally dried to obtain 840g pretreated phosphogypsum; the solids at the bottom of the cyclone filtered to obtain silica slag, which was dried to 90.3g. Washing water is recycled, but its P 2 O ...

Embodiment 2

[0032] Take 130 of Example 1 after drying phosphogypsum naturally transferred into the crucible, placed in a muffle furnace, heated at a rate of 8 ° C / min to 500 ° C calcination for 2 hours, natural cooling cooling to room temperature to obtain calcined phosphogypsum 115g.

[0033] Calcined phosphorus gypsum with 100mL acidity of 1nol / dm 3 ，Ca 2+ / Mg 2+ / PO 4 3- / H + The ratio of 2.34:1.48:0.118:1 solution was mixed, transferred to the transcrystalline kettle, heated to 90 °C, the reaction was 90min, filtered while hot, washed once with hot water, to give α - hemihydrous gypsum 46.2g. Filtered to obtain an aqueous solution added ammonium sulfate to remove calcium ions, and then with ammonia water and to pH of 7, precipitated ammonium magnesium phosphate, used for mineral processing grinding water.

[0034] 46.2g α- hemihydrous gypsum was added to the α-sulfonyl fatty acid soap solution at 90 ~ 105 ° C, the reaction continued for 30min at this temperature, and then into the air,...

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Abstract

The invention relates to the technical field of phosphogypsum recovery and utilization, and discloses a method for producing α-hemihydrate gypsum by using phosphogypsum. In the method, after the phosphogypsum is pulverized, a large amount of organic matter and silicate are removed through hydrocyclone separation, and then Calcination is used to further remove impurity carbon, and then crystallization is carried out to obtain α-hemihydrate gypsum. Finally, fatty acid is used to surface treat α-hemihydrate gypsum to obtain high-quality α-hemihydrate gypsum. The method has low treatment cost and no pollution, can efficiently and comprehensively recover phosphorus, calcium and sulfur resources in phosphogypsum, and all by-products can be effectively utilized, and the yield is high, which is suitable for enterprise production.

Description

Technical field [0001] The present invention relates to the field of phosphorus gypsum recycling technology, specifically to a method of using phosphogypsum to produce α - hemihydrous gypsum. Background [0002] Phosphogypsum refers to the by-product gypsum produced by wet sulfuric acid in the process of phosphate ore production of phosphoric acid and its phosphate. China currently mainly uses this method to produce wet phosphoric acid, according to statistics, for every 1 ton of wet phosphoric acid produced, 4 to 5 tons of phosphogypsum will be generated. Due to the poor endowment of phosphogypsum, containing a large number of impurities such as organic matter, phosphorus, quartz, silicate, iron and aluminum, it is difficult to directly apply to building materials, fillers and other fields, so the utilization rate of phosphogypsum is less than 30%, and most of them are stacked in phosphogypsum warehouses with solid waste. These phosphogypsum not only requires occupying a lot of...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B11/26C01F11/46
CPCC04B11/26C01F11/466C01P2006/65C01P2006/80
Inventor 吉永海潘志权涂娟代典万路张华丽张吉敏
Owner HUBEI GUOCHUANG HI TECH MATERIAL
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