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Method for utilizing sulfur and calcium resources in gypsum respectively

A technology for gypsum and resources, applied in chemical instruments and methods, sulfur compounds, calcium/strontium/barium oxides/hydroxides, etc., can solve the problem of high production cost, high heat consumption, limited phosphogypsum acid production and co-production of cement Using other problems to achieve the effect of low cost and high separation efficiency

Active Publication Date: 2019-04-19
SOUTHWEAT UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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  • Method for utilizing sulfur and calcium resources in gypsum respectively
  • Method for utilizing sulfur and calcium resources in gypsum respectively

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Experimental program
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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%. I...

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Abstract

The invention discloses a method for utilizing sulfur and calcium resources in gypsum respectively, and the method is as follows: adding an electron donor, a color modifier, a waste catalyst and microorganisms into the gypsum, uniformly mixing, aging and drying to obtain a dry material; introducing coal powder and a combustion improver into a boiling furnace to decompose the dry material in the boiling furnace to obtain a sulfur oxide gas and calcium oxide with color. Compared with the prior art, the method has the advantages of 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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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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