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A method for separately utilizing sulfur and calcium resources in gypsum

A gypsum and resource technology, applied in chemical instruments and methods, sulfur compounds, calcium/strontium/barium oxides/hydroxides, etc., can solve the problems of high heat consumption, high production cost, waste of resources, etc., and achieve separation efficiency High and low cost effect

Active Publication Date: 2022-03-04
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
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  • Application Information

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Problems solved by technology

However, due to the high decomposition temperature of phosphogypsum (1200°C) and high heat consumption, its production cost is high, which severely limits the utilization of phosphogypsum acid co-production cement, resulting in a great waste of resources

Method used

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  • A method for separately utilizing sulfur and calcium resources in gypsum
  • A method for separately utilizing sulfur and calcium resources in gypsum

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Embodiment Construction

[0026] The present invention will be described in further detail below in conjunction with specific examples.

[0027] (1) Add electron donor (0.1-1.0% of gypsum mass), color regulator (1-10% of gypsum mass), spent catalyst (0.1-0.9% of The total number is about 107), and after being stirred and aged for 30 days, it is dried in a rotary dryer at 300°C to obtain a dry material.

[0028] (2) Add the dry material to the cyclone preheater equipped with the fluidized decomposition furnace, and put coal powder (10-20% of the mass of gypsum) and combustion aid (1-10% of the mass of gypsum) into the fluidized furnace, and dry the material in the Fully decompose in a boiling decomposition furnace at 800-1200°C to obtain sulfur oxide gas and colored calcium oxide.

[0029] The following table is 20 embodiments numbered 1-20.

[0030]

[0031]

[0032] From Example 1-Example 20, it can be concluded that the decomposition rate of phosphogypsum is greater than or equal to 95%. In ...

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Abstract

This patent discloses a method for separately utilizing sulfur and calcium resources in gypsum. Electron donors, color regulators, waste catalysts and microorganisms are added to gypsum, mixed evenly and aged, and then dried to obtain dry materials. Put coal powder and combustion accelerant into the fluidized furnace, and the dry material is decomposed in the fluidized furnace to obtain sulfur oxide gas and colored calcium oxide. Compared with the existing technical solutions, the method has low production cost, high production efficiency and thorough decomposition.

Description

technical field [0001] The invention relates to the field of resource utilization of industrial waste residues, in particular to a method for recovering resources from gypsum, and can also be used to recover sulfur and calcium from industrial by-product gypsum. Background technique [0002] Gypsum is a sulfate mineral with the chemical formula CaSO 4 ·xH 2 O. Gypsum is divided into natural gypsum and industrial by-product gypsum. At present, industrial by-product gypsum is mainly phosphogypsum, desulfurization gypsum and titanium gypsum. [0003] Phosphogypsum is a by-product of the wet-process phosphoric acid industry, and every ton of phosphate fertilizer produced (in P 2 o 5 Calculation) produces about 4.5-5.0 tons of phosphogypsum. According to statistics, my country's phosphogypsum discharge amounted to 80 million tons in 2014, and the accumulation of phosphogypsum over the years has exceeded 300 million tons. Nationally, the comprehensive utilization rate of pho...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01B17/50C01F11/04
CPCC01B17/506C01F11/04
Inventor 谭宏斌董发勤马小玲王进蒋斌贺小春尹贻安谢笑微何英豪
Owner SOUTHWEAT UNIV OF SCI & TECH
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