Method and device for refining and recycling hydrochloric acid from hydrochloric acid pickling waste liquid
A technology for pickling waste liquid and recovering hydrochloric acid, which is applied in chemical instruments and methods, metallurgical wastewater treatment, chlorine/hydrogen chloride purification, etc., to achieve the effects of high recovery concentration, energy saving, and production cost reduction
Inactive Publication Date: 2009-11-04
WUXI XINGYI INTELLIGENT ENVIRONMENT EQUIP CO LTD
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Problems solved by technology
[0009] One of the purposes of the present invention is to overcome the deficiencies in the prior art, to provide a hydrochloric acid pickling waste solution that can solve the problem of treatment and disposal of a large amount of hydrochloric acid waste liquid produced during iron and steel cleaning, and can quickly recover the equipment cost of investment. Method for recovering hydrochloric acid
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[0023] The present invention will be further described below in conjunction with specific drawings and embodiments.
[0024] The pickling waste liquid produced by the hydrochloric acid pickling line enters the waste acid storage tank 1 and is transported to the filter 2 by the waste acid pump. system. The waste acid feed liquid enters the heater 4 through the forced circulation pump, and exchanges heat with the refrigerant medium in the heater 4. After reaching a certain evaporation temperature, it returns to the vacuum evaporator 3. Under the vacuum state in the vacuum evaporator 3, Water and hydrochloric acid are evaporated, separated from liquid and gas by the demister at the top of the vacuum evaporator 3, then enter the condenser 5, and after heat exchange, it is cooled to liquid dilute hydrochloric acid, and then enters the reuse acid storage tank 6 through a jet vacuum pump, and transports Back to the pickling line for reuse.
[0025] Along with the continuous evapora...
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The invention relates to the technical field of treating hydrochloric acid pickling waste liquid, and in particular discloses a method for refining and recycling hydrochloric acid from the hydrochloric acid pickling waste liquid. The invention also discloses a device for realizing the hydrochloric acid recycling method. The method comprises the following steps: filtering the hydrochloric acid pickling waste liquid in a waste acid storage tank through a filter; conveying the filtered waste liquid to a vacuum evaporator; conveying the hydrochloric acid pickling waste liquid in the vacuum evaporator from the bottom of the vacuum evaporator to a heater for heating through a circulating pump; returning the heated hydrochloric acid pickling waste liquid to the vacuum evaporator for forced circulation and vacuum evaporation; conveying mixed steam on the top of the vacuum evaporator into a condenser for condensing through a pipeline; pumping the condensed mixed steam into a recycled acid storage tank for storage through a vacuum pump; utilizing the circulating pump to convey concentrated solution on the bottom of the vacuum evaporator to a centrifugal filter; performing centrifugal separation to obtain ferrous chloride crystals; and allowing mother liquor to flow back to the waste acid storage tank after the centrifugal separation. The invention can realize the evaporation of hydrochloric acid at a low temperature, thereby saving heat energy and ensuring the reduction of production cost.
Description
technical field [0001] The invention relates to the technical field of treatment of hydrochloric acid pickling waste liquid, in particular discloses a method for refining and recovering hydrochloric acid from hydrochloric acid pickling waste liquid, and also discloses a device for realizing the hydrochloric acid recovery method. Background technique [0002] In order to improve the surface structure of steel to facilitate processing, the industry often uses strong acid to chemically clean the surface of steel to remove the oxidized rust layer. When the pickling is carried out to a certain extent, the acid concentration in the lotion decreases, the metal ion concentration increases, and the pickling rate slows down. At this time, new acid needs to be replaced to maintain a suitable pickling speed, so aging waste acid is produced. Because hydrochloric acid is relatively cheap and has a better pickling effect, it is widely used in the field of pickling. According to incomplet...
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Login to View More IPC IPC(8): C01B7/07C02F9/10C02F1/04C02F1/38C02F101/12C02F103/16
CPCY02P20/10
Inventor 匡优新
Owner WUXI XINGYI INTELLIGENT ENVIRONMENT EQUIP CO LTD