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Use of magnesium used refractory, preparation and use method of composite scale inhibitor

A technology of composite scale inhibitor and refractory material, applied in the field of flue gas desulfurization

Active Publication Date: 2012-10-10
BAOSHAN IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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  • Use of magnesium used refractory, preparation and use method of composite scale inhibitor

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Experimental program
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Effect test

Embodiment 1

[0045] figure 1 It is the preparation process of composite antiscalant. In this example, 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 sorting and sorting, removing surface slag and cold steel, crushing and crushing, magnetic separation and iron removal, and multi-stage grinding, it is made into 100-mesh powder. 2 SO 4 Immerse in the solution for 1 hour, remove impurities such as dust and inclusions by gravity flotation, then dry at 60°C for 2 hours, and roast at 600°C for 2 hours, after cooling, add 1wt% acetonitrile to the magnesium refractory powder The diacid, 10wt% sodium humate and 1wt% sodium sulfate are mixed evenly to form a 5.0wt% solution, and added to the desulfurization tower in an appropriate amount.

[0046] The original flue gas is the exhaust gas from a sintering plant of a steel company, with a flow rate of 90,000m 3 / h, the temperature is 120°C, SO in flue ga...

Embodiment 2

[0049] Such as figure 1 As shown, after the cement industry uses magnesia-calcium bricks (chemical composition is: MgO, 75.57%, CaO, 19.85%, Al 2 o 3 , 0.51%, SiO 2 , 1.15%, Fe 2 o 3 , 0.74%) after sorting and sorting, removing surface slag and cold steel, crushing and crushing, magnetic separation and iron removal, and multi-stage grinding, it is made into a 325-mesh powder. 2 SO 4 Immerse in the solution for 8 hours, remove impurities such as dust and inclusions by gravity flotation, then dry at 200°C for 8 hours, and roast at 1000°C for 8 hours. The diacid, 10wt% sodium humate and 10wt% sodium sulfate are mixed evenly to form a 30.0wt% solution, which is added to the desulfurization tower in an appropriate amount.

[0050] The original flue gas is the exhaust flue gas from a power plant with a flow rate of 720,000m 3 / h, the temperature is 130℃, SO in the flue gas 2 The concentration is 2500~3800mg / Nm 3 . The desulfurizer is limestone slurry, the fineness of lime...

Embodiment 3

[0053] Such as figure 1 As shown, the magnesia-alumina bricks used in the iron and steel industry (chemical composition: MgO, 50.25%, CaO, 1.28%, Al 2 o 3 , 23.51%, SiO 2 , 2.50%, Fe 2 o 3 , 0.44%) after sorting and sorting, removing surface slag and cold steel, crushing, magnetic separation and iron removal, and multi-stage grinding, it is made into 100-mesh powder. 2 SO 4 Immerse in the solution for 4 hours, remove impurities such as dust and inclusions by gravity flotation, then dry at 200°C for 2 hours, and roast at 900°C for 6 hours. After cooling, add 30wt% hexene di After the acid and 10wt% sodium humate are mixed evenly, they are mixed with the limestone solid powder desulfurizer at a ratio of 0.05wt%, and then made into a 20.0wt% solution, and added in an appropriate amount to the desulfurization tower.

[0054] The original flue gas is the exhaust gas from a sintering plant of a steel company, with a flow rate of 60,000m 3 / h, the temperature is 130℃, SO in t...

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Abstract

The invention discloses a usage of magnesium used refractory material as well as the preparation and using method of a compound scale inhibitor, and is characterized in that the magnesium used refractory material which is the waste of industry is used for preparing the compound scale inhibitor. The method for preparing the compound scale inhibitor comprises the steps: 1) the magnesium used refractory material which is the waste of industry is sequentially treated by sorting, removing slag and chilled steel, grounding processing, magnetic separation and removal of iron as well as multilevel grounding, and then made into powder; 2) acid cleaning and dipping, the obtained powder is dipped in strong acid solution and treated by gravity-floatation; 3) drying and roasting; 4) additive is evenlymixed. When in use, the compound scale inhibitor is not only can be mixed with limestone / lime solid material to be prepared into solution for synchronous adding, but also can be prepared into solution to be directly added into a desulfurizing tower. The invention has simple processing, saves the resources and reduces the preparation cost of the compound scale inhibitor; the compound scale inhibitor can improve the desulfurization degree, the utilization rate of absorbent and the reliability of system operation, while the desulphurization system is prevented from scale formation.

Description

technical field [0001] The invention relates to flue gas desulfurization technology, in particular to a process for preparing a flue gas desulfurization composite scale inhibitor by using magnesia refractory materials. Background technique [0002] The wet limestone / lime-gypsum flue gas desulfurization process has become the mainstream of the current flue gas desulfurization process due to its mature process route, high desulfurization efficiency, and good adaptability to flue gas and desulfurizers, accounting for about 80% of the market share . However, in actual operation, due to the Ca(OH) in the absorption liquid 2 , CaCO 3 , CaSO 3 , CaSO 4 The deposition or crystallization of such substances often leads to fouling of the system, which seriously affects the physical and chemical processes of the desulfurization system, resulting in increased system resistance and decreased desulfurization efficiency. When the scale layer reaches a certain thickness, it may fall off...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01D53/50B01D53/78C02F5/08
Inventor 石磊陈荣欢王如意姚金甫沈晓林石洪志林瑜刘道清
Owner BAOSHAN IRON & STEEL CO LTD
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