Method for extracting iodine from blanching waste water of fresh kelp

A technology for extracting iodine from kelp blanching wastewater, applied in the direction of iodine, iodine/hydrogen iodide, etc., can solve problems such as iodine is not easy to crystallize, oxidant environmental pollution, and analysis speed is not easy to control, so as to avoid pollution, low maintenance cost, and economical Efficient Extraction Extraction Effects

Inactive Publication Date: 2012-06-27
YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved in the present invention is to provide a method for extracting iodine from fresh kelp blanching wastewater; use the air blowing method to extract iodine in fresh kelp blanching wastewater, to overcome the poor water quality of fresh kelp blanching wastewater, many impurities, Strong production seasonality and other shortcomings that cannot be solved by the traditional kelp iodine extraction process. At the same time, the high temperature of fresh kelp blanching wastewater is used to solve the heating problem of the traditional air blowing method, reduce process costs, and realize economical and efficien

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026]Embodiment 1: the oxidizing agent that adopts for step 2 is NaNO 2 , total iodine content and NaNO in fresh kelp blanching wastewater 2 The ratio of 1.5: 1; the volume ratio of blown air and liquid used in step 3 is about 300: 1, and the absorption solution used in step 4 is Na 2 SO 3 Solution; The iodine analysis method adopted for step 5 is to use Na 2 SO 3 The analysis method adopted when the solution is used as the absorption liquid, the pH value of the absorption liquid is adjusted to 1.2 with concentrated sulfuric acid, and the oxidant KClO is added according to the iodine content in the absorption liquid 3 Precipitate iodine, iodine and KClO 3 The mass ratio of is 3: 1; The reducing agent that adopts for step 6 is NH 2 SO 3 H.

[0027] The blanching wastewater generated during the blanching process of fresh kelp is about 5m 3 , where the iodine content is 300ppm, and the water temperature is 70°C. Add industrial hydrochloric acid with a concentration of 3...

Embodiment 2

[0029] Embodiment 2: the oxidizing agent that adopts for step 2 is NaClO, and the ratio of total iodine amount and NaClO available chlorine in the fresh kelp blanching waste water is 9: 1, and the volume ratio of blowing out air and liquid that adopts for step 3 is about 500: 1 , the absorption solution that adopts for step 4 is the NaOH solution of concentration 10%, the iodine analysis method that adopts for step 5 is the acidification analysis method that adopts when using NaOH solution as absorption liquid; Decomposes during the process, no need to add reducing agent to remove.

[0030] The raw material for extracting iodine is about 5m of blanching wastewater generated during the blanching process of fresh kelp. 3 , where the iodine content is 540ppm, and the temperature is 68°C. Add 36% industrial hydrochloric acid in the feed liquid to adjust the fresh sea-tangle blanching wastewater pH value to 0.5; the amount of adding 10% NaClO solution of available chlorine in the ...

Embodiment 3

[0032] Embodiment 3: the oxidizing agent that adopts for step 2 is NaClO and NaNO 2 Combined use, add NaClO and then add NaNO 2 , the total iodine content of the feed liquid and the available chlorine of NaClO and NaNO 2 The ratio is 1: 0.1: 0.1, the volume ratio of blown air and liquid used in step 3 is about 1000: 1, the absorption solution used in step 4 is NaOH solution, and the iodine analysis method adopted in step 5 is to use NaOH solution The reduction acidification oxidation method used as the absorption liquid, the reducing agent used is Na 2 SO 3 ; The reducing agent adopted for step 6 is NH 2 SO 3 Na.

[0033] The raw material for extracting iodine is about 5m of blanching wastewater generated during the blanching process of fresh kelp. 3 , wherein the iodine content is 800ppm, and the temperature is 72°C. Adding sulfuric acid to the feed liquid to adjust the pH value of the fresh sea-tangle blanching water to 1; the amount of adding 10% NaClO solution of av...

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Abstract

A method for extracting iodine from blanching waste water of fresh kelp comprises the steps as follows: adjusting the pH value of the blanching waste water, adding an oxidant into the blanching waste water, blowing out the iodine in the blanching waste water by using air, absorbing the iodine in the blown out air by using a solution, analyzing the iodine in the absorption solution, and removing residual oxidant in iodine waste water. The invention overcomes the defects that cannot be overcome in the traditional kelp ion-exchange iodine extraction process through the adoption of the air blowing method, and solves the heating problems in the traditional air blowing method in virtue of the characteristic of high temperature of the blanching waste water of fresh kelp, reduces process cost, realizes economical and efficient extraction of iodine from the blanching waste water of fresh kelp, and achieves the iodine extraction rate above 80 percent. The invention discloses a reduction acidification oxidation method to solve the speed problem of iodine analysis adopting a NaOH solution as an absorption solution and improve quality. Besides, the invention adopts a quantitative reaction method and removes the residual oxidant NaNO2 in the waste water after iodine extraction, thereby solving the problem of environmental pollution caused by the oxidant in the traditional process.

Description

Technical field: [0001] The invention belongs to the technical fields of environmental protection and chemical industry, and in particular relates to a method for extracting iodine from fresh kelp blanching wastewater. Background technique: [0002] Kelp processing is one of the pillar industries in my country's aquaculture industry. The annual output of kelp is about 800,000 tons, of which about 500,000 tons are processed into salted kelp after blanching and salting. volume of high-temperature hot water for blanching treatment, and the total amount of blanching wastewater produced by fresh kelp processing is about 80,000-100,000 tons per year. During this process, some active ingredients in the fresh kelp will dissolve in the blanching water, and the iodine content in it can reach 300-800ppm. However, this part of the blanching water has high temperature, high impurities, and poor water quality. It wastes resources and pollutes the environment. [0003] The traditional iod...

Claims

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Application Information

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IPC IPC(8): C01B7/14
Inventor 冷凯良苗钧魁殷邦忠许洋孙伟红邢丽红贾福强
Owner YELLOW SEA FISHERIES RES INST CHINESE ACAD OF FISHERIES SCI
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