New process for recycling magnesium sulfate heptahydrate by utilizing magnesium oxide flue gas desulfurization
A technology of magnesium sulfate heptahydrate and magnesium oxide, applied in magnesium sulfate, chemical instruments and methods, dispersed particle separation and other directions, can solve the problems of high cost, high energy consumption of magnesium sulfate, reduce energy consumption and cost, etc., and achieve utilization rate Improved, high recovery rate, reduced energy consumption and cost
Inactive Publication Date: 2012-08-15
国粤(深圳)科技投资有限公司 +1
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[0009] In order to overcome the disadvantages of high energy consumption and high cost of magnesium oxide desulfurization and recovery of magnesium sulfate at present in China, the invention provides a new process for recovery of magnesium sulfate heptahydrate from magnesium oxide flue gas desulfurization, which can improve the utilization rate of absorbent, and it utilizes flue gas The thermal energy heats and evaporates the water in the magnesium sulfate solution, and it uses the air-cooled crystallization tower to further evaporate the water in the magnesium sulfate solution and cool and crystallize. This new process technology can greatly reduce energy consumption and cost
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[0044] The present invention will be described in detail below in conjunction with the accompanying drawings.
[0045] Such as figure 1 Shown, concrete technological process of the present invention is as follows:
[0046] (1) Magnesium oxide powder is used to prepare desulfurization agent slurry. Add magnesium oxide powder (200-300 mesh) and water into the pulping box in proportion to mix, stir and react to make absorbent slurry, and the solid content of the slurry is controlled at 10-30%. The absorbent slurry is sent to the desulfurization tower.
[0047] (2) Flue gas absorption reaction. In the desulfurization tower, the absorbent slurry circulates to absorb sulfur dioxide in the flue gas to generate magnesium sulfite, thereby removing sulfur dioxide in the flue gas. The temperature of the slurry in the desulfurization tower is controlled at 45-68°C, and the pH value of the circulating slurry is between 5-6.5. Blow air into the desulfurization tower, and control 40-60% ...
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Abstract
The invention discloses a new process for recycling magnesium sulfate heptahydrate by utilizing magnesium oxide flue gas desulfurization. The new process is characterized by comprising the following steps: (1) magnesium oxide pulping; (2) flue gas desulfurization; (3) evaporation warming; (4) filter purification and cooling crystallization; (5) centrifugal separation; and (6) drying to obtain magnesium sulfate heptahydrate. According to the invention, the absorption liquid is subjected to evaporation concentration by utilizing flue gas heat energy, and water in the magnesium sulfate solution is evaporated, and the magnesium sulfate solution is cooled and crystallized by using an air cooling crystallizing tower, thus the energy consumption and cost for recycling magnesium sulfate are remarkably lowered and the use ratio of the magnesium oxide absorbent is improved as well.
Description
technical field [0001] The invention belongs to the technical field of flue gas desulfurization, and in particular relates to a new process for utilizing magnesium oxide wet flue gas desulfurization and recovering magnesium sulfate heptahydrate. Background technique [0002] Flue gas desulfurization technology is one of the main means to control sulfur dioxide emissions. At present, the limestone-gypsum method is the main process of flue gas desulfurization, but the gypsum produced by this method is of poor quality and low price, resulting in high operating costs. [0003] Since my country's magnesium oxide (magnesia) resources are very rich, accounting for about 25% of the world's total reserves, magnesium oxide desulfurization technology has been developed in China in recent years. The main process of magnesium oxide desulfurization technology is as follows: firstly, magnesium oxide is added with water to react to make magnesium hydroxide slurry, and the magnesium oxide s...
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IPC IPC(8): B01D53/80B01D53/50B01D53/96C01F5/40
Inventor 张罡黄光茂吴江许金秀徐立新严言午黄燕何斌鸿
Owner 国粤(深圳)科技投资有限公司