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Process for preparing super-fine calcium sulfate from recycled sulfur dioxide waste gas

A technology of sulfur dioxide and calcium sulfate, which is applied in the fields of calcium/strontium/barium sulfate, chemical instruments and methods, and separation of dispersed particles, can solve problems such as sulfur dioxide pollution, and achieve the effect of reducing usage and production costs

Inactive Publication Date: 2010-10-13
HUNAN HENGGUANG TECH
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Problems solved by technology

[0005] The purpose of the present invention is to solve the pollution problem of sulfur dioxide discharge from the production of sodium silicate as a raw material by using a new approach without relying on the production of downstream product white carbon black, so as to realize the combination of sodium silicate as a raw material and sodium silicate Large-scale industrial production of ultra-fine calcium sulfate with high added value

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  • Process for preparing super-fine calcium sulfate from recycled sulfur dioxide waste gas
  • Process for preparing super-fine calcium sulfate from recycled sulfur dioxide waste gas

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Embodiment

[0040] Take the production of 40 tons of dry process water glass per day as an example:

[0041] 1. Using sodium sulfate, silica sand, and reduced coal as raw materials, and industrial coal as fuel, heat-storage horseshoe furnace is used to produce water glass. The consumption of sodium sulfate is 0.95 tons / hour, the consumption of silica sand is 1.25 tons / hour, and the consumption of reduced coal is 0.10 tons / hour. After the material is evenly distributed, it is fed into the melting furnace at a feeding rate of 2.3 tons / hour. The flow rate of the molten water glass is 1.667 tons / hour, and the daily output of dry-process water glass is 40 tons.

[0042] 2. The temperature of the waste gas exiting the regenerative horseshoe water glass melting furnace is 320°C, the volume concentration of carbon dioxide is 3.1%, and the flow rate of the waste gas is 4736Nm / h

[0043] 3. The exhaust gas enters the absorption tower, and 25% sulfuric acid is formed in the absorption tower. The te...

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Abstract

The invention discloses a process for preparing super-fine calcium sulfate from recycled sulfur dioxide waste gas, in particular to a process for producing high-value-added super-fine calcium sulfate from sulfur dioxide waste gas discharged from the dry-process water-glass production based on anhydrous sodium sulfate and low-cost industrial lime, which is used for achieving the effective recycling of sulfur dioxide. The process mainly comprises the following procedures: the absorption of sulfur dioxide; the catalytic oxidation of sulfur dioxide to form dilute sulfuric acid; the pulping treatment of calcium oxide; the addition of calcium sulfate growth inhibitor; the formation of super-fine calcium sulfate slurry; filter pressing and drying to obtain the product of super-fine calcium sulfate. By handling the problem of pollution caused by sulfur dioxide waste gas and producing the high-value-added super-fine calcium sulfate product at the same time, the process of the invention achieves the co-production of water-glass and super-fine calcium sulfate and obviously reduces the production cost. Therefore, the process is suitable for industrialized production.

Description

Technical field: [0001] The invention relates to the field of chemical industry, in particular to a process for preparing superfine calcium sulfate from sulfur dioxide waste gas discharged from the production of water glass by a lime recovery dry method. technical background: [0002] A large amount of sulfur dioxide waste gas is produced in the process of using sodium sulfate to produce water glass. Calculated by volume, the concentration of sulfur dioxide in the general exhaust gas is greater than 3%, which will cause obvious air pollution to the environment. The biggest disadvantage that exists. As environmental protection issues become more and more prominent, the process of producing water glass and then preparing white carbon black by using sodium sulfate is replaced by the soda ash, that is, sodium carbonate method, and has become the mainstream of dry production of water glass. The price of sodium sulfate is generally about 300 yuan / ton, and the price of sodium carb...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B01D53/78C01F11/46
Inventor 曾维兴
Owner HUNAN HENGGUANG TECH
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