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Process and system for co-production of quick lime and sulfur through gypsum reduction, oxidation and cyclic calcination

An oxidation cycle and process system technology, applied in the direction of sulfur preparation/purification, calcium/strontium/barium oxide/hydroxide, sulfur compounds, etc., can solve the problems of reducing the quality of quicklime and inability to co-produce various sulfur products , to achieve the effects of lowering the decomposition temperature, alleviating the shortage of sulfur resources, and reducing external dependence

Active Publication Date: 2020-11-27
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Aiming at the problem that the quicklime prepared from gypsum in the prior art contains calcium sulfide, which greatly reduces the quality of the quicklime, and the process of preparing quicklime from gypsum in the prior art cannot co-produce various sulfur products

Method used

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  • Process and system for co-production of quick lime and sulfur through gypsum reduction, oxidation and cyclic calcination

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0045] like figure 1 As shown, this embodiment provides a gypsum reduction-oxidation cyclic calcination system for joint production of lime and sulfur, including a gypsum storage bin 1 for storing gypsum, a preheating and drying system 2 connected in sequence, a reduction calciner 3, and a first high-temperature separator 4. Oxidation calciner 5, second high temperature separator 6, quicklime cooler 7 and quicklime storage bin 8, the gas phase outlet of the first high temperature separator 4 is connected to the gas phase inlet of the preheating drying system 2, one of the outlets of the second high temperature separator 6 Connect the reduction calciner inlet. Generally, the reaction between CaS and oxygen at high temperature also has parallel competing reactions. This embodiment limits the excess air ratio in the redox section. In the device disclosed in the present disclosure, a part of CaS reacts with oxygen to generate CaO and SO2 Another part of CaS reacts with oxygen to...

Embodiment 2

[0049] This embodiment provides a process for cyclic calcination of gypsum reduction and oxidation to generate lime and sulfur. The process is carried out in the system for cyclic calcination of gypsum reduction and oxidation to generate lime and sulfur described in Example 1.

[0050] Including the following steps:

[0051] The gypsum is stored in the gypsum storage bin 1, and is transported to the gypsum preheating and drying system 2 through the feeder to precisely control the feeding amount for preheating and drying. The high-temperature heat source comes from the calcination flue gas discharged from the reduction calciner 3; The temperature of the gypsum is 600-1050°C, first enters the reduction calciner 3, controls the reaction temperature 700-1200°C in the reduction calciner 3 and controls the air coefficient and excess air coefficient of the reducing gas, specifically, by controlling the reducing gas and the The mixing ratio of air and gas flow are precisely controlled...

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Abstract

The invention belongs to the field of solid waste resource utilization, and particularly provides a system and process for co-production of quick lime and sulfur through gypsum reduction, oxidation and cyclic calcination. The method comprises the following steps that gypsum is subjected to reduction calcination and then subjected to oxidation calcination, the reaction temperature of reduction calcination and oxidation calcination is controlled to be 700-1200 DEG C, and the gas-air coefficient is the excess air coefficient; sulfur dioxide in the flue gas separated in the reduction calcining process is subjected to carbon thermal reduction to generate sulfur; flue gas generated in the oxidation calcining process carries an oxidation calcining material to return to the reduction calcining process for cyclic calcining until the mass fraction of collected solid materials meets the requirements of quicklime products, the problems that in the prior art, quick lime prepared by taking gypsum asa raw material contains calcium sulfide, the quality of the quick lime is greatly reduced, a sulfur product cannot be co-produced in the process of preparing the quick lime by taking gypsum as a rawmaterial, and the environment is polluted are solved.

Description

technical field [0001] The disclosure belongs to the field of resource utilization of solid waste, and specifically provides a process and a system for generating lime and sulfur through gypsum reduction and oxidation cycle calcination. Background technique [0002] The statements herein merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] At present, the production of industrial by-product gypsum in my country is about 118 million tons, and the comprehensive utilization rate is only 38%. Among them, desulfurization gypsum is about 43 million tons, with a comprehensive utilization rate of about 56%; phosphogypsum is about 50 million tons, with a comprehensive utilization rate of about 20%; other by-product gypsum is about 25 million tons, with a comprehensive utilization rate of about 40%. At present, the cumulative stockpiles of industrial by-product gypsum have exceeded 300 million tons, including m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B2/10C01F11/08C01B17/02
CPCC04B2/10C01F11/08C01B17/0264
Inventor 马春元夏霄张立强崔琳赵希强李军
Owner SHANDONG UNIV
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