Gas guide tube used for aluminum fluoride production by dry method

Abstract

The invention relates to a gas guide tube, in particular to a gas guide tube used for aluminum fluoride production by a dry method. The gas guide tube used for the aluminum fluoride production by the dry method is characterized by comprising a steel lining polytetrafluoroethylene (PTFE) straight pipe, a first steel lining PTFE expansion joint, a steel lining PTFE distribution pipe, a steel lining PTFE main guide tube, a steel lining PTFE connector, a second steel lining PTFE expansion joint and a steel lining PTFE bend, wherein the steel lining PTFE straight pipe is connected with the steel lining PTFE distribution pipe through the first steel lining PTFE expansion joint; the steel lining PTFE distribution pipe is arranged inside the steel lining PTFE main guide tube; the steel lining PTFE main guide tube is connected with the second steel lining PTFE expansion joint through the steel lining PTFE connector; and the second steel lining PTFE expansion joint is connected with the steel lining PTFE bend. The gas guide tube is reasonable in structure, long in service life, convenient to maintain and low in construction cost, and has good cooling, cleaning and purifying effects.

Description

technical field [0001] The invention relates to an air guiding tube, in particular to an air guiding tube for dry process aluminum trifluoride production. Background technique [0002] The gas guide pipe is the connection equipment between the hydrogen fluoride reaction kiln, the pre-purification tower and the sulfuric acid mixing tank. When the gas produced by the hydrogen fluoride reaction kiln passes through the gas guide pipe, the sulfuric acid from the sulfuric acid mixing tank is sprayed to cool down, washed and purified, and then enters the pre-purification The sulfuric acid enters the hydrogen fluoride reaction kiln to react with fluorite. [0003] The current air duct is easily damaged during use, causing production to be stopped for maintenance and causing a large amount of economic losses. According to the analysis of the actual production situation, it is found that the design of the airway tube has the following problems: [0004] (1) Since the designed air gu...

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Problems solved by technology

[0004] (1) Since the designed air guide pipe is an inclined straight pipe, after the gas generated by the hydrogen fluoride reaction kiln enters, the sprayed sulfuric acid can only contact a small part of the hydrogen fluoride gas, which cannot achieve a good cooling, washing and purification effect

[0005] (2) Sulfuric acid will directly impact the bottom of the air guide pipe after it comes down from the mixing tank, causing serious erosion and wear at the bottom, and significantly shortening the service life

This material is severely worn and corroded under the high temperature of 200°C, high-concentration sulfuric acid and hydrogen fluoride at high speed, and cannot meet the process requirements.

Moreover, domestic producers who do not have this material must import it from abroad, which has a long delivery cycle and high cost.

[0007] (4) The amount of gypsum brought into the subsequent pre-purification system is too large, resulting in an increase in the solid content of the pre-purification cycle acid, resulting in frequent blockage of the pre-purification acid cooler, and serious wear of the magnetic pump and diaphragm pump

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