A heavy metal adsorbent for purifying dilute acid and its application
A technology of heavy metals and adsorbents, which is applied in the direction of adsorption of water/sewage treatment, other chemical processes, chemical instruments and methods, etc., can solve problems such as the decline of effects, and achieve the effects of reducing water consumption, ideal sedimentation effect, and reducing emissions
Active Publication Date: 2019-04-19
云南兴贤环保科技有限公司
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Problems solved by technology
However, although the existing DTC adsorbents have obvious removal effect on heavy metal ions in neutral or partial alkaline solution, their effect will be greatly reduced in the environment of strong acid solution.
Method used
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Experimental program
Comparison scheme
Effect test
Embodiment 1
[0033] Prepare heavy metal adsorbent sample 1, the specific method is as follows:
[0034] (1) Get 50 mass parts of dimethyl ammonium dithiocarbamate aqueous solution of 30% mass concentration and drop in the reactor;
[0035] (2) Get 3 parts of sodium sulfite and put it into the reaction kettle, stir and mix;
[0036] (3) Get 30 parts of ammonium sulfide aqueous solution of 17% mass concentration and drop in the reactor, stir and mix;
[0037] (4) Get 15 parts of thiourea aqueous solution of 5% mass concentration and put into the reactor, stir and mix;
[0038] (5) Take 2 parts of tannic acid and put it into the reaction kettle, stir and mix evenly to obtain the heavy metal adsorbent.
Embodiment 2
[0040] Repeat embodiment 1, have following difference: prepare heavy metal adsorbent sample 2, raw material is composed of:
[0041]
Embodiment 3
[0043] Repeat embodiment 1, have following difference: prepare heavy metal adsorbent sample 3, raw material is composed of:
[0044]
[0045]
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The invention discloses a heavy metal adsorbent for purifying a dilute acid and application thereof. The heavy metal adsorbent is prepared by mixing the following components in order: 50-70 parts of a 30% ammonium dimethyldithiocarbamate aqueous solution, 2-5 parts of sodium sulfite, 10-30 parts of a 17%-20% ammonium sulfide aqueous solution, 10-20 parts of a 5% thiourea aqueous solution and 2-5 parts of tannic acid. The heavy metal adsorbent is filled into a filtration adsorption tower, waste acid is introduced into the filtration adsorption tower, purified dilute acid enters a plate-type heat exchanger for cooling via a dilute acid circulation tank, and after cooling, the cooled dilute acid is introduced into a two-level dynamic wave washing tower for flue gas washing. The product can effectively remove heavy metal ions from the waste acid, and overcomes the problem of poor treatment effect of a conventional DTC heavy metal adsorbent in acidic environment. The heavy metal adsorbent is combined with a dilute acid purifying reuse method, the acid concentration of the cyclic dilute acid can be significantly enhanced without affection of the process conditions, dilute acid emission can be reduced, the consumption of water in purification process can be reduced, and the water saving emission reduction effect is remarkable.
Description
technical field [0001] The invention belongs to the technical field of sulfuric acid production flue gas purification, and in particular relates to a heavy metal adsorbent capable of effectively purifying dilute acid. At the same time, the invention also relates to the application method of the heavy metal adsorbent in the purification and recycling of dilute acid. Background technique [0002] In the production of sulfuric acid, the wet purification of flue gas adopts the pickling purification process, and the main purification equipment includes a power wave scrubber, a packed tower and a two-stage electric demister. The use of dynamic wave system can effectively purify the flue gas, so that the harmful impurity dust and some gaseous impurity molecules in the flue gas can transfer phases and enter the circulating dilute acid, so as to obtain qualified raw flue gas. However, with the increase of the number of cycles, the circulating dilute acid contains a large amount of s...
Claims
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IPC IPC(8): B01J20/22C02F1/28C02F1/62
CPCB01J20/22B01J2220/46C02F1/285C02F2101/20
Inventor 蔡挂才缪忠和沈宗庆黄晓阳
Owner 云南兴贤环保科技有限公司