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Process for producing industrial phosphate with calcination method

An industrial phosphoric acid and phosphate technology, applied in the fields of phosphorus compounds, chemical instruments and methods, inorganic chemistry, etc., to achieve low energy and material consumption and stable product quality

Active Publication Date: 2013-09-04
SICHUAN SHANGZHOU IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

More than 60% of the phosphate rocks in my country are low-grade phosphate rocks, most of which are less than 25%. To use wet acid production, this part of phosphate rocks must be washed before use, which increases production costs and causes a lot of waste of resources.

Method used

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  • Process for producing industrial phosphate with calcination method

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Effect test

Embodiment 1

[0026] Using 1260 tons of Phosphate Mine in Laomergshan, Jinkouhe District, Leshan City, Sichuan Province 2 o 5 21.5% of the phosphate rock is used to produce industrial phosphoric acid. First, the phosphate rock is crushed and then crushed again. The crushed phosphate rock powder is passed through a 120-mesh sieve, and the P contained in it is 2 o 5 The mass percentage content of CaO is about 21%, the mass percentage content of CaO is about 48%, Fe 2 o 3 The mass percentage content of Al is about 1.2%, Al 2 o 3 The mass percentage of is about 0.8%, the mass percentage of MgO is about 6%, the mass percentage of SiO2 is about 2.4%, and the mass percentage of F is about 2.1%;

[0027] (2) Mixing and forming: Put phosphate rock powder and sulfuric acid with a concentration of 98% into the mixing mixer in proportion to stir, and the mixed materials are transported to the forming field for 3 hours, the mass ratio of phosphate rock powder to sulfuric acid =1:0.5, the two are e...

Embodiment 2

[0036] Using 120 tons containing P 2 o 5 21.5% of the phosphate rock is used to produce industrial phosphoric acid. Firstly, the phosphate rock is crushed and crushed again. The crushed phosphate rock powder is passed through a 120-mesh sieve. The selected phosphate rock is low-grade phosphate rock, which contains P 2 o 5 The mass percentage content of CaO is about 21%, the mass percentage content of CaO is about 48%, Fe 2 o 3 The mass percentage content of Al is about 1.2%, Al 2 o 3 The mass percentage of is about 0.8%, the mass percentage of MgO is about 6%, the mass percentage of SiO2 is about 2.4%, and the mass percentage of F is about 2.1%;

[0037] (2) Mixing and forming: Put the phosphate rock powder and sulfuric acid into the mixing mixer in proportion to stir. After mixing, the materials are transported to the forming field for 3 hours. Accurate measurement by flow meter, accurate measurement of phosphate rock powder by belt scale, mass ratio of phosphate rock ...

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Abstract

The invention relates to a process for producing industrial phosphate with a calcination method. The method includes the steps as follows: firstly, crushing: phosphate rock is primarily crushed and then smashed again, smashed phosphate rock powder is sieved with a 120-mesh sieve; secondly, mixing and curing: the phosphate rock powder and sulfuric acid are placed into a mixing stirrer in proportion for stirring, and a mixed material is conveyed to a curing field to be cured for 2-3 hours; thirdly, calcination: cured clinker is conveyed to a calcination furnace for calcination, the calcination temperature is controlled to range from 250 DEG C to 280 DEG C, and the calcination time is controlled to be 1.5 hours to 2 hours; fourthly, hydrolysis: the calcinated gaseous substance is recycled, watered and recycled to generate fluosilicic acid, a solid substance enters a hydrolytic tank and is stirred to generate phosphoric acid, and the concentration of the generated phosphoric acid is controlled to be 12%-18%. According to the process, condition requirements are simple; raw materials with impurities of iron, magnesium and aluminum exceeding a prescribed limit of phosphoric acid by wet process can still be used for producing the industrial phosphate with the adoption of the process, and the product quality is stable.

Description

technical field [0001] The invention relates to the field of industrial application of phosphate rock, in particular to a process for producing industrial phosphate by a calcining method. [0002] Background technique [0003] In the prior art, there are two production methods of phosphate, one is thermal phosphoric acid: because more impurities such as iron, aluminum, calcium and magnesium are contained in the phosphate rock in our country, P 2 o 5 The phosphate rock with a mass percentage of more than 27% is heated to about 1350°C by electric heating method to generate P-containing steam, which is then calcined with oxygen to produce phosphoric acid and then phosphate. This method consumes high energy and is Pollution is large, and it is a project to be phased out. The other is wet-process phosphoric acid: this method will produce impurities such as aluminum oxide, iron oxide, and calcium oxide, which often produce a lot of precipitated substances, such as AlPO 4 、FeP...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/222C01B25/30
Inventor 罗宗恬李秋水
Owner SICHUAN SHANGZHOU IND
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