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Process and equipment for continuously producing selenium dioxide

A technology of selenium dioxide and production process, applied in the chemical industry, sustainable manufacturing/processing, selenium/tellurium oxide/hydroxide, etc., can solve the problems of intermittent production of selenium dioxide, environmental pollution, etc., and achieve occupational hygiene The effect of good conditions, high product yield and low power consumption

Pending Publication Date: 2022-02-01
连州市拓胜新能源有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to solve the problems of existing selenium dioxide intermittent production and environmental pollution, and provide a process and equipment for continuous production of selenium dioxide, so as to achieve the goals of high quality, high yield, energy saving and environmental protection

Method used

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  • Process and equipment for continuously producing selenium dioxide
  • Process and equipment for continuously producing selenium dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] A continuous production process for selenium dioxide, comprising the steps of:

[0028] 1. Add 50kg of selenium material from the hopper 3 into the oxidation furnace 4, close the feed valve, and seal it;

[0029] 2. The oxidation furnace 4 is energized and heated, and the temperature rises to 270°C;

[0030] 3. Open the equipment or valves in the order of vacuum pump → oxygen → sublimator → rotary crystallization chamber, and maintain the negative pressure of the system at -10mmH 2 O column left and right;

[0031] 4. Oxygen is passed into the oxidation furnace 4 after flow meter 2 is metered, and reacts with selenium to generate gaseous selenium dioxide;

[0032] 5. When the temperature of the oxidation furnace 4 reaches 500°C, the heating is gradually stopped, and the reaction heat is used to maintain the oxidative combustion to continue, feeding once per hour, and the feeding amount is 30kg;

[0033] 6. Control the temperature of the sublimator between 450 and 500...

Embodiment 2

[0038] A continuous production process for selenium dioxide, comprising the steps of:

[0039] 1. Add 75kg of selenium material from the hopper 3 into the oxidation furnace 4, close the feed valve, and seal it;

[0040] 2. The oxidation furnace 4 is energized and heated, and the temperature rises to 285°C;

[0041] 3. Open the equipment or valves in the order of vacuum pump→oxygen→sublimator→rotary crystallization chamber, and maintain the negative pressure of the system at -30mmH 2 O column left and right;

[0042] 4. Oxygen is passed into the oxidation furnace 4 after flow meter 2 is metered, and reacts with selenium to generate gaseous selenium dioxide;

[0043] 5. When the temperature of the oxidation furnace 4 reaches 500°C, the heating is gradually stopped, and the reaction heat is used to maintain the oxidative combustion to continue, feeding once every 1.5 hours, and the feeding amount is 45kg;

[0044]6. Control the temperature of the sublimator between 450 and 500...

Embodiment 3

[0049] A continuous production process for selenium dioxide, comprising the steps of:

[0050] 1. Add 100kg of selenium material from the hopper 3 into the oxidation furnace 4, close the feed valve, and seal it;

[0051] 2. Turn on the electric heater 4 of the oxidation furnace, and the temperature rises to 300°C;

[0052] 3. Open the equipment or valves in the order of vacuum pump→oxygen→sublimator→rotary crystallization chamber, and maintain the negative pressure of the system at -50mmH 2 O column left and right;

[0053] 4. Oxygen is passed into the oxidation furnace 4 after flow meter 2 is metered, and reacts with selenium to generate gaseous selenium dioxide;

[0054] 5. When the temperature of the oxidation furnace 4 reaches 500°C, the heating is gradually stopped, and the reaction heat is used to maintain the oxidative combustion to continue, feeding once every 2 hours, and the feeding amount is 60kg;

[0055] 6. Control the temperature of the sublimator between 450 ...

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Abstract

The invention provides a selenium dioxide continuous production process and equipment. The equipment consists of a liquid oxygen storage tank 1, a flow meter 2, a feeding hopper 3, an oxidizing furnace 4, a sublimator 5, a rotary crystallization chamber 6, a separator 7 and a vacuum pump 8. The process comprises the following steps: 1, a feeding hopper 3 is disposed at the top of an oxidation furnace 4, and selenium is added into the furnace in batches, at regular time and quantitatively through valve control to ensure continuous operation of the oxidation furnace; 2, a rotary crystallization chamber 6 is additionally arranged, selenium dioxide is cut and falls into a packaging bag at the lower part of the central cylinder after being condensed and crystallized in the chamber, and the selenium dioxide is continuously produced; 3, a water jet vacuum pump is adopted for vacuumizing, the system maintains negative-pressure operation, tail gas washing is completed at the same time, and pollution of selenium dioxide production to the environment is eliminated. According to the invention, the problems of incapability of continuous production, environmental pollution and the like in the existing production process are solved, so that the purposes of continuous, efficient, high-quality, energy-saving and environment-friendly selenium dioxide production are achieved.

Description

Technical field: [0001] The invention relates to a process and equipment for the continuous production of selenium dioxide, belonging to the field of inorganic chemical production. Background technique: [0002] Selenium dioxide is a white shiny square crystal with a specific gravity of 3.59-3.95. It is very volatile. The gaseous selenium dioxide condenses into white or light yellow needles, which can be volatilized without melting. The sublimation temperature is 315°C. It is very soluble in water. This produces selenous acid. Selenium dioxide has a wide range of applications, the main uses are: [0003] 1. Metallurgy: Selenium dioxide is an additive produced by electrolytic metal manganese, and its consumption accounts for about 70% of the output of selenium dioxide; [0004] 2. Agriculture: used as foliar fertilizer raw material for selenium-containing crops, used in aquaculture to produce sodium selenite as a feed additive; [0005] 3. Chemical industry and glass: Sele...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B19/00
CPCC01B19/004Y02P20/10
Inventor 马远宏
Owner 连州市拓胜新能源有限公司
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