Use of magnesium used refractory materials and method for preparing desulfurizing agent thereof

A desulfurization agent and refractory technology, applied in the field of flue gas desulfurization, can solve problems such as easy scaling, large amount of circulating water, and complex system management operations, so as to avoid energy consumption and environmental pollution, reduce operating costs, and save magnesium The effect of sand resource

Inactive Publication Date: 2011-05-11
BAOSHAN IRON & STEEL CO LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, the limestone-gypsum method is the mainstream process for flue gas desulfurization [CN2629812Y]. Although it has the advantages of high desulfurization efficiency, good adaptability to flue gas, mature process route, and cheap and easy-to-obtain desulfurizer, it still faces the following problems: ①CaCO 3 , CaSO 3 and CaSO 4 The solubility is low, and fouling, blockage and wear are prone to occur during system operation; ②The use value of the by-product gypsum is low, and the market sales prospect is not optimistic, especially in places where the by-product natural gypsum is accumulated in large quantities, causing environmental pollution;③ The equipment occupies a large area, the system management operation is complicated, and the investment and operation costs are high; ④The amount of circulating water is large, and the desulfurization wastewater is difficult to treat; ⑤The calcium method produces equimolar CO while desulfurization 2 , exacerbating the greenhouse effect
This not only wastes resources, but also pollutes the environment

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The magnesia carbon brick (chemical composition: MgO, 71.85%, F.C., 14.34%, CaO, 2.26%, Al 2 o 3 , 4.43%, SiO 2 , 3.10%, FeO, 0.36%) after manual demolition, sorting and sorting, slag and impurity removal, crushing, magnetic separation, ball milling pretreatment, after gravity flotation removal of impurities and activation treatment of roasting at 1000 °C for 4 hours, it was made into 100 The target powder is sent to the MgO mixing tank through the feeder, where it is mixed with process water and digested to generate Mg(OH) 2 Slurry, after aging for 3h, by Mg(OH) 2 Delivery pump to Mg(OH) 2 Slurry storage tank, adjust the solid content of the slurry to 10%, and transport it to the absorption tower.

[0028] The original flue gas is taken from the exhaust flue gas of a sintering plant, with a flow rate of 90000m 3 / h, the flue gas temperature is 120-140°C, the SO in the flue gas 2 The concentration is 500~800mg / Nm 3 , After the desulfurization absorption process i...

Embodiment 2

[0030] Magnesium-calcium bricks used in the cement industry (chemical composition: MgO, 75.57%, CaO, 19.85%, Al 2 o 3 , 0.51%, SiO 2 , 1.15%, Fe 2 o 3, 0.74%) after manual demolition, sorting and sorting, slag and impurity removal, crushing, magnetic separation, ball milling pretreatment, after gravity flotation removal of impurities and activation treatment of roasting at 600 °C for 6 hours, it was made into 325 mesh powder, which was given The feeder is sent to the MgO mixing tank, where it is stirred, mixed and digested with process water to generate Mg(OH) 2 Slurry, after aging for 5h, from Mg(OH) 2 Delivery pump to Mg(OH) 2 Slurry storage tank, adjust the solid content of the slurry to 30%, and transport it to the absorption tower.

[0031] The original flue gas is taken from a power plant with a flow rate of 600,000m 3 / h, the flue gas temperature is 110-130°C, and the SO2 concentration in the flue gas is 2500-2900mg / Nm 3 , After the desulfurization absorption pr...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses an application of a magnesium used refractory and a method for preparing desulfurizing agents from the magnesium used refractory. The application of the magnesium used refractory is mainly characterized in that industrial waste magnesium used refractory is used as a flue gas desulfurizing agent. The preparation method comprises the following steps: (1) carrying out sorting, impurity removal, crushing and processing, magnetic separation for removing ferrum and multistage grinding on the decomposed magnesium used refractory to be prepared into powder; (2) acid washing and gravity floating; (3) drying and baking; (4) preparing slurry: preparing the obtained powder into slurry with the solid content between 10 percent and 30 percent and curing the slurry for 3-5 hours.The invention not only saves excellent magnesite sources, but also avoids energy consumption and environment pollution in the process of treating the waste magnesium used refractory and manufacturingthe prior magnesium oxide powder desulfurizing agent and greatly reduces the cost of the flue gas desulphurization process by a magnesium wet method.

Description

technical field [0001] The invention belongs to the technical field of flue gas desulfurization, in particular to a method for preparing a desulfurizing agent in a desulfurization tower. Background technique [0002] Currently, my country's SO 2 The total emissions have exceeded 20 million tons for many years, ranking first in the world. The flue gas desulfurization process has been widely used in the purification of industrial flue gas. Generally, the alkaline absorption liquid is used to contact the flue gas to make the flue dust and SOx in the flue gas 2 Enter the absorption liquid together to purify the flue gas. Common processes include limestone / lime-gypsum method, discarding method, sodium washing method, double alkali method, magnesium oxide method, flue gas circulating fluidized bed method, activated carbon method, ammonia method, Spray drying method and calcium spraying in the furnace plus tail humidification activation method, etc. Among them, the limestone-gyp...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50
Inventor 石磊沈晓林姚金甫王如意陈荣欢刘道清林瑜石洪志
Owner BAOSHAN IRON & STEEL CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap