Silica gel cleaning production method and sulfuric acid production method

A clean production and production method technology, applied in the direction of sulfur trioxide/sulfuric acid, silicon oxide, silicon dioxide, etc., can solve problems such as air pollution and achieve energy saving effects

Inactive Publication Date: 2008-12-24
QINGDAO MAKALL GROUP CO LTD
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  • Application Information

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Problems solved by technology

[0008] Because this method will emit a large amount of sulfur-containing flue gas, which will cause serious pollution to the atmosphere, it has been rarely used in recent years.

Method used

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  • Silica gel cleaning production method and sulfuric acid production method
  • Silica gel cleaning production method and sulfuric acid production method
  • Silica gel cleaning production method and sulfuric acid production method

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Experimental program
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Embodiment Construction

[0057] 1. Sodium silicate (Na 2 O 3.3SiO 2 ) production

[0058] The content of sodium sulfate is 99%, the average fineness is 50 mesh, the content of sodium sulfate is 98.5%, the content of silicon dioxide is 98.5%, the water content is 2.6%, the average particle size is 60 mesh, and the fixed carbon content is 72%. The average fineness Coal with a degree of 40 mesh, a calorific value of 6800 kcal / kg, and a sulfur content of 2.2% is fully mixed evenly, and the batching ratio is in accordance with the stoichiometric ratio of sodium natron with a modulus of 3.3, but the excess of sodium sulfate is 8%. The added amount of reduced coal is increased to 7% of the theoretical added amount of Yuanming powder, and it is continuously added to the horseshoe flame kiln with a heat value of 1350 kcal / Nm3 as fuel and a heating temperature of 1400 ° C. Paohuatin with a modulus of 3.3 is produced. At the same time, the total amount of flue gas (wet basis) measured is: 33653~37134Nm 3 / h,...

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Abstract

The invention relates to a cleaning production method of a silica gel and a production method of a sulfuric acid belonging to the preparation technology field of the silica gel and sulfuric acid, wherein the silica gel production method employs sulfuric acid to react with alkali metal silicate, the alkali metal silicate is prepared by kraft process and the material sulfuric acid is completely or partially from sulfur compounds in the recovered flue gas during the production of another material alkali metal silicate. The production method of the invention achieves the repeated recycle of the sulfur element and the alkali metal element, improves the resource utilization rate and solves the environmental protection problem. The sulfuric acid production method of the invention is to recover the sulfur compounds in the flue gas during the production of the alkali metal silicate and to produce sulfuric acid by the unsteady conversion technology, which overcomes the problems of higher concentration of sulfur dioxide and little fluctuation required in the acid-making technology and achieves the autothermal equilibrium of the conversion with little investion and low energy consumption.

Description

technical field [0001] The invention relates to a clean production method of silica gel, including a recycling process of raw materials and (by-)products, and a method for producing sulfuric acid by recovering sulfur compounds in the flue gas in the alkali metal silicate production process as the main raw material. Background technique [0002] Silica gel is a silica xerogel with a three-dimensional network structure. It is usually prepared industrially by reacting sodium silicate (trade name sodium silicate, common name water glass) with various inorganic acids (mainly sulfuric acid). The production methods of sodium silicate are divided into dry method and wet method, and the dry method is divided into carbonate method, sulfate method, bisulfate method, nitrate method or solid caustic soda method, among which carbonate method and The sulfate method is most commonly used. [0003] The carbonate method uses soda ash and quartz sand as raw materials. The production process o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/14C01B17/69
Inventor 李永兆
Owner QINGDAO MAKALL GROUP CO LTD
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