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System and method for co-producing sulfo-aluminate cement and sulfur by use of desulfurized gypsum and aluminum ash

A technology for sulfoaluminate cement and desulfurized gypsum, applied in chemical instruments and methods, sulfur preparation/purification, sulfur compounds, etc., can solve the problems of rising sulfur prices, insufficient gypsum carbon, and difficult to control atmosphere in the kiln

Active Publication Date: 2017-08-18
中芈(山东)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

my country's application of gypsum decomposition and co-production of cement and sulfuric acid technology started relatively late. At present, the mature technology is to combine the dried powdery materials with other raw materials and grind them into the hollow rotary kiln for decomposition and calcination. The atmosphere in the kiln is difficult to control. , prone to problems such as high oxygen content in the kiln, which will cause the carbon added in the raw material to partially react with oxygen, resulting in insufficient carbon required for the decomposition reaction of gypsum, and lower decomposition rate and desulfurization rate.
[0007] At the same time, my country is short of sulfur resources. Natural gypsum ore is generally used to produce sulfur, but the cost of producing sulfur from natural gypsum ore is relatively high. Chemical production mainly relies on imported sulfur, which leads to rising sulfur prices and increases the cost of chemical production.

Method used

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  • System and method for co-producing sulfo-aluminate cement and sulfur by use of desulfurized gypsum and aluminum ash
  • System and method for co-producing sulfo-aluminate cement and sulfur by use of desulfurized gypsum and aluminum ash
  • System and method for co-producing sulfo-aluminate cement and sulfur by use of desulfurized gypsum and aluminum ash

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0068] Such as figure 1 As shown, the aluminum ash and desulfurized gypsum are respectively sent into the dryer. In terms of solid matter after drying, desulfurized gypsum: 61%, aluminum ash: 38%, and activated carbon 1%. It is directly transported into the hollow rotary kiln for calcination, the calcination temperature is 1280°C, and the calcination time is 60 minutes. The high-temperature kiln gas produced passes through the waste heat recovery equipment, and the by-product high-temperature steam and hot water are used for indirect drying of the original aluminum ash and desulfurized gypsum. The kiln gas exiting the waste heat recovery equipment, the gas temperature is reduced to 860°C, and after dust removal, dehumidification purification, supplementary air to adjust the oxygen-sulfur ratio and drying, it enters the fixed bed of activated carbon with a particle size of 10 mesh, and generates elemental sulfur through catalytic reduction. The prepared sulfur The purity reach...

Embodiment 2

[0071] Send aluminum ash and desulfurized gypsum into the dryer respectively. In terms of dried solid matter, desulfurized gypsum: 66%, aluminum ash: 33%, and activated carbon 1%. It is directly transported into the hollow rotary kiln for calcination, the calcination temperature is 1250°C, and the calcination time is 50 minutes. The high-temperature kiln gas produced passes through the waste heat recovery equipment, and the by-product high-temperature steam and hot water are used for indirect drying of the original aluminum ash and desulfurized gypsum. The kiln gas exiting the waste heat recovery equipment, the gas temperature is reduced to 855°C, after dust removal, dehumidification purification, supplementary air to adjust the oxygen-sulfur ratio and drying, it enters the fixed bed of activated carbon with a particle size of 10 mesh, and generates elemental sulfur through catalytic reduction. The prepared sulfur The purity reaches 99%. Microwave heating is used to evaporate ...

Embodiment 3

[0074] Such as figure 2 As shown, the aluminum ash and desulfurized gypsum are sent into the dryer respectively. In terms of solid matter after drying, desulfurized gypsum: 65%, aluminum ash: 34%, and activated carbon account for 1%. It is directly conveyed into the hollow rotary kiln, and gas is passed into the rotary kiln for calcination. The calcination temperature is 1300°C and the calcination time is 30 minutes. The high-temperature kiln gas produced passes through the waste heat recovery equipment, and the by-product high-temperature steam and hot water are used for indirect drying of the original aluminum ash and desulfurized gypsum. The kiln gas exiting the waste heat recovery equipment, the gas temperature is reduced to 860°C, and after dust removal, dehumidification purification, supplementary air to adjust the oxygen-sulfur ratio and drying, it enters the two-stage reactor, and each reactor is filled with Cu / Al 2 o 3 Catalyst, and gas is fed into the two-stage re...

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Abstract

The invention discloses a system and a method for co-producing sulfo-aluminate cement and sulfur by use of desulfurized gypsum and aluminum ash. The method comprises the following steps: (1) drying aluminum ash, and heating desulfurized gypsum for dehydration to obtain semi-hydrated gypsum; (2) mixing aluminum ash with semi-hydrated gypsum according to a preset ratio, pulverizing, and homogenizing; (3) calcining the pulverized and homogenized mixture of aluminum ash and semi-hydrated gypsum while adding coal dust to the mixture, and carrying out oxygen enriched combustion to obtain sulfo-aluminate cement clinker and sulfur dioxide-containing flue gas; (4) mixing sulfo-aluminate cement clinker and desulfurized gypsum according to a ratio, and pulverizing to obtain sulfo-aluminate cement; and (5) dedusting the sulfur dioxide-containing flue gas, and carrying out catalytic reduction to obtain a sulfur product, wherein the mass ratio of aluminum ash to desulfurized gypsum to carbon powder is (33-39):(61-66):1.

Description

technical field [0001] The patent of the invention relates to the fields of chemical industry, building material technology, comprehensive utilization of desulfurized gypsum and aluminum ash resources, and environmental protection and management, and specifically relates to a system and method for producing sulphoaluminate cement and co-producing sulfur by using desulfurized gypsum and aluminum ash. Background technique [0002] In today's society where land resources are increasingly tight and environmental protection is becoming more and more important, the Ministry of Industry and Information Technology of China has included tailings, coal gangue, fly ash and smelting slag from five major industries in the "Twelfth Five-Year Plan" Special Plan for Comprehensive Utilization of Bulk Industrial Solid Waste , by-product gypsum and red mud are listed as bulk industrial solid waste, and they are the main objects of treatment. Among them, red mud, aluminum ash, and desulfurized ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/32C01B32/40C01B17/04
CPCC01B17/04C01B17/0473C01B17/0482C01P2006/80C04B7/323
Inventor 任常在吴长亮刘晓斌刘全勋王勇付华辉
Owner 中芈(山东)环保科技有限公司
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