Method for production of wet process phosphoric acid and byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum

A technology of hemihydrate gypsum and wet-process phosphoric acid, applied in chemical instruments and methods, phosphorus compounds, calcium/strontium/barium sulfate, etc., to reduce production costs and improve utilization

Active Publication Date: 2016-01-06
贵州正磷科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0009] After searching, there are no relevant patents and reports on the industrial large-scale production proce

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  • Method for production of wet process phosphoric acid and byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum

Examples

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Embodiment 1

[0046] Raw material 1: phosphate rock, collection location: Guizhou;

[0047] Raw material 2: sodium citrate, commercially available;

[0048] Raw material 3: aluminum sulfate, commercially available;

[0049] Raw material 4: sodium dodecylsulfonate, commercially available;

[0050] Raw material 5: sulfuric acid, concentration is 97wt%, commercially available;

[0051] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0052] A method for producing wet process phosphoric acid by-product α hemihydrate gypsum and high purity and high whiteness α hemihydrate gypsum, comprising steps as follows:

[0053] (1) Add phosphate rock powder and excess phosphoric acid into the extraction tank, the solid-to-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:18, the concentration of phosphoric acid is 25wt%, under the condition of constant...

Embodiment 2

[0062] Raw material 1: phosphate rock, collection location: Guizhou;

[0063] Raw material 2: sodium citrate, commercially available;

[0064] Raw material 3: iron sulfate, commercially available;

[0065] Raw material 4: sulfuric acid, concentration is 97%, commercially available;

[0066] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0067] A method for producing wet process phosphoric acid by-product α hemihydrate gypsum and high purity and high whiteness α hemihydrate gypsum, comprising steps as follows:

[0068] (1) Add phosphate rock powder and excess phosphoric acid into the extraction tank, the solid-to-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:25, the concentration of phosphoric acid is 30wt%, under the condition of constant stirring, after the extraction reaction is complete , add a sulfuric acid solut...

Embodiment 3

[0077] Raw material 1: phosphate rock, collection location: Guizhou;

[0078] Raw material 2: iron sulfate, commercially available;

[0079] Raw material 3: sodium dodecylsulfonate, commercially available;

[0080] Raw material 4: sulfuric acid, concentration is 97%, commercially available;

[0081] The sulfuric acid solutions used in the examples are obtained by diluting concentrated sulfuric acid with a concentration of 97 wt%, and carried out in a sulfuric acid dilution tank.

[0082] A method for producing wet process phosphoric acid by-product α hemihydrate gypsum and high purity and high whiteness α hemihydrate gypsum, comprising steps as follows:

[0083] (1) Add phosphate rock powder and excess phosphoric acid into the extraction tank, the solid-to-liquid mass ratio of phosphate rock powder and phosphoric acid is 1:30, the concentration of phosphoric acid is 28wt%, under the condition of constant stirring, after the extraction reaction is complete , add a sulfuric a...

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Abstract

The invention relates to a method for production of wet process phosphoric acid and byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum. The method includes: adding phosphoric acid and ground phosphate rock into an extraction tank to conduct extraction reaction, then adding sulfuric acid for further reaction to make 30%-50% of calcium ions generate dihydrate gypsum, transferring the part of dihydrate gypsum into a crystal transformation tank, adding a crystal modifier and controlling the crystal transformation conditions to obtain 30%-50% of ordinary alpha-hemihydrated gypsum, letting the other 50%-70% of calcium ions exist in the form of monocalcium phosphate in a phosphoric acid leaching solution, performing separation, then leading the phosphoric acid leaching solution into a decalcification reaction tank, adding a washing lotion diluted sulfuric acid solution, firstly performing decalcification, then controlling the crystal transformation conditions to subject the solid to crystal transformation reaction so as to generate high purity and high whiteness alpha-hemihydrated gypsum. The method provided by the invention not only reduces the content of phosphorus in the by-product alpha-hemihydrated gypsum, but also realizes industrial production of wet process phosphoric acid and the byproducts alpha-hemihydrated gypsum and high purity and high whiteness alpha-hemihydrated gypsum, thus meeting different requirements of industrial production requirements and market demands.

Description

technical field [0001] The invention relates to a production method of wet-process phosphoric acid, in particular to a method for producing α-hemihydrate gypsum by-product of wet-process phosphoric acid and high-purity and high-whiteness α-hemihydrate gypsum. Background technique [0002] In the traditional wet-process phosphoric acid manufacturing process, sulfuric acid and phosphate rock produce phosphoric acid and phosphogypsum. The phosphorus content of the by-product phosphogypsum is generally above 1.0%, and phosphogypsum with a phosphorus content higher than 0.5% is subject to many restrictions whether it is used as a chemical raw material or as a building material. Phosphogypsum has piled up like a mountain in many enterprises and has become a public nuisance. The problem of phosphogypsum has become a technical problem and a restrictive factor for the sustainable development of the phosphorus chemical industry. [0003] At present, there are many studies on improvin...

Claims

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Application Information

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IPC IPC(8): C01B25/231C01F11/46
CPCC01F11/46C01B25/231C01B25/321
Inventor 胡兆平姚华龙陈宏坤庞世花刘永秀李成志
Owner 贵州正磷科技有限公司
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