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Treating method and system for tungsten smelting waste gas

A treatment method and exhaust gas technology, applied in the direction of gas treatment, separation methods, chemical instruments and methods, etc., can solve the problems of large alkali consumption, high cost, high energy consumption, etc., and achieve the effect of efficient utilization

Active Publication Date: 2019-08-27
JIANGXI UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the defects of large alkali consumption, high energy consumption and high cost in the treatment process of ammonia-containing and sulfur-containing waste gas from tungsten smelting in the prior art, thereby providing a low reagent consumption and low energy consumption. A method and system for treating waste gas from tungsten smelting with low consumption, low cost, good ammonia sulfur absorption effect and high value-added by-products

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  • Treating method and system for tungsten smelting waste gas

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Using Nessler's reagent spectrophotometry (HJ535-2009) to determine the concentration of ammonia before tungsten smelting waste gas treatment is 200mg / m 3 , Using ion chromatography (HJ549-2009) to determine the concentration of hydrogen sulfide before tungsten smelting waste gas treatment is 10mg / m 3 .

[0042] This embodiment provides a method for treating waste gas from tungsten smelting, including:

[0043] S1. The waste gas from tungsten smelting is subjected to a heat exchange and cooling treatment, and the temperature of the heat exchange outlet water is controlled to be ≤45°C to obtain a condensed ammonia and waste gas.

[0044] S2. The primary condensed ammonia and waste gas obtained from S1 are sprayed with tap water circulation to obtain sulfur-containing ammonia and waste gas. When the free ammonia (NH 3 When the concentration of) reaches 50g / L, add hydrogen peroxide gradually and take samples for testing. When S 2- When the concentration is 0g / L, stop adding hydrog...

Embodiment 2

[0051] Using Nessler's reagent spectrophotometry (HJ535-2009) to determine the concentration of ammonia before exhaust gas treatment is 200mg / m 3 , Using ion chromatography (HJ549-2009) to determine the concentration of hydrogen sulfide before exhaust gas treatment is 10mg / m 3 .

[0052] This embodiment provides a tungsten smelting waste gas treatment system, which includes a first heat exchanger 1, a first leaching tower 2, a second heat exchanger 3, and a The second leaching tower 4, the third leaching tower 5, and the fourth leaching tower 6, the first fan 15 is connected to the gas inlet of the first heat exchanger 1, and the second fan 16 is connected to the second heat exchanger 3 and the Between the two leaching towers 4, the third fan 17 is connected between the third leaching tower 5 and the fourth leaching tower 6. Among them, the leaching tower is equipped with an elution tank and a leaching pump, the first leaching tower 2 is equipped with an eluting tank 7 and a leac...

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Abstract

The invention provides a treating method for tungsten smelting waste gas. The method comprises the step that tungsten smelting waste gas is subjected to first-time heat exchange cooling treatment, tapwater circular spraying, second-time heat exchange cooling treatment, diluted hydrochloric acid circular spraying and diluted sulphuric acid circular spraying separately to obtain purified waste gas.The invention further provides a treating system for tungsten smelting waste gas. According to the method and system, condensed and cooled ammonia hydroxide and waste gas are subjected to tap water circular spraying at the same time, efficient recycling of ammonia can be completed with no alkali addition and air stripping, multi-stage spraying and absorption are performed, the ammonia and sulfurremoval effect is good, meanwhile, ammonia hydroxide, ammonia chloride, ammonia sulfate and other products with the high value can be obtained, and solutions for spraying can all be recycled; on one hand, the concentration of the obtained product can be increased; on the other hand, consumption of reagents is reduced, energy consumption is low, the cost is low, and tungsten smelting waste gas is efficiently absorbed and utilized.

Description

Technical field [0001] The invention relates to the technical field of waste gas treatment, in particular to a method and system for treating waste gas from tungsten smelting. Background technique [0002] Ammonium paratungstate (APT) is an important precursor for preparing tungsten powder. The main process for producing ammonium paratungstate is: firstly, tungsten ore is prepared by sodium hydroxide decomposition / sodium carbonate decomposition method to prepare sodium tungstate feed solution, and then through traditional decomposition method and solvent extraction method , Ion exchange method, etc., convert the sodium tungstate feed solution into ammonium tungstate feed solution, then purify the ammonium tungstate feed solution to remove molybdenum, and finally use the evaporation crystallization method to prepare ammonium paratungstate solid. Among them, in the process of purifying and removing molybdenum from the ammonium tungstate feed solution, in order to achieve a better m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/00B01D53/14B01D53/18B01D53/58B01D53/75B01D53/78B01D53/96C01C1/02C01C1/16C01C1/24
CPCB01D53/002B01D53/14B01D53/18B01D53/78B01D53/58B01D53/75B01D53/96C01C1/24C01C1/164C01C1/022B01D2257/406
Inventor 黄万抚曾斌曾祥荣李新冬黄李金鸿胡运祯张天锡
Owner JIANGXI UNIV OF SCI & TECH
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