Waste acid concentration multistage treatment method
A treatment method, acid concentration technology, applied in water/sewage multi-stage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve problems affecting equipment maturity, lower thermal efficiency, increase cost, etc., to achieve Save cooling water, save material, save steam effect
A treatment method, acid concentration technology, applied in water/sewage multi-stage treatment, chemical instruments and methods, heating water/sewage treatment, etc., can solve problems affecting equipment maturity, lower thermal efficiency, increase cost, etc., to achieve Save cooling water, save material, save steam effect
CN101935077AActive Publication Date: 2011-01-05NANTONG JINGTONG GRAPHITE EQUIP
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[0029] The present invention will be further described in detail below in combination with specific embodiments.
[0030] figure 2 It is a schematic diagram of the connection relationship of the waste acid concentration multi-stage treatment device. refer to figure 2 As shown, the waste acid concentration multi-stage treatment device includes preheater, I-effect evaporating heater, I-effect evaporating separator, II-effect evaporating heater, II-effect evaporating separator, cooler, crystallizer, separator, III Efficient evaporation heaters, evaporation separators, and various components are connected in series in sequence with pipes.
[0031] And between the I-effect evaporative heater and the I-effect evaporative separator, and between the II-effect evaporative heater and the II-effect evaporative separator, a circulation pump is set to realize the circulation operation of the material; the cooler is connected with a circulation pump to make the II-effect The acid outpu...
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The invention relates to a waste acid concentration multistage treatment method which comprises the following steps of: heating 20-22% waste acid by a preheater, evaporating by a one-effect evaporation heater and a double-effect evaporation heater, cooling by a cooler and crystallizing by a crystallizer; heating by a triple-effect evaporation heater and separating by a separator to obtain 65% concentrated acid. The secondary steam part is used as a heat source part of the next stage heater and is condensed by spraying cooling water, wherein the one-effect evaporation heater and the double-effect evaporation heater are falling film graphite tube array evaporation heaters; the triple-effect evaporation heater is a floating head tube array graphite heat exchange. The water evaporation capability of the method is increased from 2.5 tons to 10 tons, and the stage number is 3 or more. A large amount of steam and cooling water is saved, and the pollution to the environment is reduced. The heat exchange area of equipment is reduced by 30%, and materials are saved and manufacturing cost is reduced correspondingly. The heat of steam is fully utilized, more than 35% of steam is saved, and more than 30% of cooling water can be saved. The condensed water part of the steam is used as the hear source part of the preheater and is recycled for other uses.
Description
technical field [0001] The invention relates to a low-concentration waste acid recovery and emission reduction method, in particular to a method for utilizing the evaporation characteristics of decompression and flash evaporation of the bath liquid to evaporate the water in the bath liquid so as to achieve the purpose of concentrating and recycling the waste acid A multistage treatment method for waste acid concentration. Background technique [0002] Sulfuric acid is the main raw material for the production of titanium dioxide by the sulfuric acid method, and a large amount of waste acid is produced during the production process. According to different processes, hydrolysis waste acid with a concentration of 17%-22% is generally called concentrated sulfuric acid, and 4-10% is bleaching waste acid. Generally speaking, 1 ton of finished product can produce 3.5 tons of dilute sulfuric acid, of which the total amount of dilute acid is 15%-20% is returned to the acid hydrolysis...
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Patent Timeline
05 Jan 2011
Publication
CN101935077A
- IPC
- C02F1/04; C02F9/10
- Inventors
- 陈汉明; 陈汉军