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Technology for calcining and recycling magnesium desulfurizing byproduct containing magnesium sulfite

A magnesium method desulfurization, magnesium sulfite technology, applied in the direction of sulfur compounds, magnesium oxide, chemical instruments and methods, etc., can solve the problems of reduced investment benefits, reduced activity of magnesium oxide, low utilization value of magnesium sulfite products, etc.

Active Publication Date: 2010-01-13
SINOPEC NINGBO ENG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Its disadvantage is that the utilization value of the finished magnesium sulfite produced is low, which increases the operating cost of the device
The disadvantage is that the calcination temperature is high, which wastes energy, and causes the activity of the generated magnesium oxide to decrease, and does not use waste heat
Its disadvantages are: if the calcined magnesium sulfite is less, the amount of sulfur dioxide produced after calcining is less, the investment benefit is correspondingly reduced, and the waste heat is not used

Method used

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  • Technology for calcining and recycling magnesium desulfurizing byproduct containing magnesium sulfite

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0088] formula:

[0089]Magnesium sulfite water-containing filter cake 100 parts by weight (from the desulfurization by-product of various magnesium method flue gas desulfurization devices, wherein detection obtains about 77% of magnesium sulfite, about 2% of calcium sulfite, about 10% of water content, and the balance cannot Avoided inert impurities (comprising about 1% of magnesium salt and about 9% of other solid content), the parts by weight are based on magnesium sulfite)

[0090] Sulfur 25 parts by weight

[0091] Program:

[0092] After the hydrous filter cake of magnesium sulfite and sulfur are transported, sulfuric acid is produced in the following sections of raw material mixing, boiling calcination, closed dilute pickling and purification, and two-transfer and two-suction sections.

[0093] step:

[0094] 1.1 Raw material section

[0095] Magnesium sulfite water-containing filter cake and sulfur are transported into the raw material warehouse for storage separat...

Embodiment 2

[0130] The process of Example 2 is according to Example 1, the difference is that the calcination section of part 1.2 controls the temperature of the calcination furnace to ~850°C.

[0131] Product comprises: product acid is 98% sulfuric acid (total conversion ratio is greater than 99%); Produce 3.82Mpa-450 ℃ medium pressure superheated steam; Contain the magnesium oxide of 70-80% by weight in the solid product containing magnesium oxide (reactivity The discoloration time detected by the citric acid method is about 100 seconds.).

[0132] discuss:

[0133] The product obtained under this temperature is similar to the product obtained in Example 1, but the activity of magnesium oxide produced is slightly reduced.

Embodiment 3

[0135] The process of embodiment 3 is according to embodiment 1, the difference is that the parts of sulfur are 30. Product comprises: product acid is 98% sulfuric acid (total conversion ratio is greater than 99%); Produce 3.82Mpa-450 ℃ medium pressure superheated steam; Contain the magnesium oxide of 70-80% by weight in the solid product containing magnesium oxide (reactivity The discoloration time detected by the citric acid method is about 80 seconds.).

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Abstract

The invention provides a method for calcining and recycling magnesium desulfurizing byproducts, which comprises the following the steps: (a) providing the following components in portion by weight: 100 portions of magnesium desulfurizing byproducts containing magnesium sulfite and 10 to 35 portions of sulfur mixture; and (b) carrying out boiling calcination on the mixture of the step (a) at a calcining temperature of between 500 DEG C and 1,000 DEG C to decompose the mixture into gas products containing SO2 and solid products containing magnesium oxide.

Description

technical field [0001] The invention relates to a recycling method, in particular to a reclamation recycling technology of magnesium sulfite, a by-product of magnesium desulfurization. Background technique [0002] my country is the world's largest coal producer and consumer. SO 2 Pollution has become an important factor restricting my country's economic and social development, reducing SO 2 Emissions, Controlling Atmospheric SO 2 Pollution and the protection of atmospheric environmental quality are the main issues of my country's environmental protection at present and for a long time to come. [0003] In recent years, the patented magnesium desulfurization technology has been applied in a very few countries or regions such as the United States, Japan, South Korea, and Taiwan. Compared with the limestone-gypsum method, the magnesium oxide method has many advantages: the desulfurization reaction activity of the magnesium-based desulfurizer is high, the dosage is only 40%...

Claims

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Application Information

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IPC IPC(8): C01F5/12C01B17/50
Inventor 仝明唐志永陈昕亢万忠林大泉鲁军
Owner SINOPEC NINGBO ENG
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