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Method for preparing silver iodide by using iodine-contained brine

A technology of silver iodide and brine, which is applied in the direction of silver halide, can solve the problems of high cost of silver iodide and underutilization of iodine resources in brine, and achieve the effects of less reagent consumption, easy control of the production process, and low requirements for production scale

Inactive Publication Date: 2013-04-24
QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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  • Claims
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Problems solved by technology

[0007] The technical problem to be solved by the present invention is to overcome the high cost of preparing silver iodide in the prior art and the defects that iodine resources in brine are not fully utilized, and provide a method for preparing silver iodide with low cost and utilizing iodine-containing brine

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  • Method for preparing silver iodide by using iodine-contained brine
  • Method for preparing silver iodide by using iodine-contained brine
  • Method for preparing silver iodide by using iodine-contained brine

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preparation example Construction

[0025] figure 1 According to an embodiment of the present invention, a process flow for preparing silver iodide using iodine-containing brine is shown. As can be seen from the figure, the preparation method mainly includes the following three steps:

[0026] Step A, preparing gel balls, mixing sodium alginate hydrosol and silver chloride at a mass ratio of 100-500:1 to form a sol mixture, dropping the sol mixture into an aqueous calcium chloride solution to produce a gel, The gel is separated from the liquid phase system to obtain gel balls, and the gel balls contain silver chloride and calcium alginate. The concentration of the sodium alginate hydrosol can be 0.5-8wt%, and the concentration of the calcium chloride aqueous solution can be 2-18wt%. If the mass ratio of sodium alginate hydrosol to silver chloride is too small, the silver chloride will fall off from the gel ball; if the mass ratio of sodium alginate hydrosol is too small, the adsorption capacity of the gel micr...

Embodiment 1

[0038] Preparation of gel balls: Mix 250g of 2wt% sodium alginate aqueous sol with 1g of silver chloride solid powder to form a sol mixture; drop the sol mixture into 5wt% calcium chloride aqueous solution to produce a gel precipitate; The gel precipitate was separated from the liquid phase system to obtain 7 g of gel spheres.

[0039]Adsorption of iodine ions: put the gel balls into 22 kg of brine containing 40 mg / L iodine, stir and adsorb for 48 hours to obtain 8 g of iodine-loaded gel balls.

[0040] Preparation of silver iodide: put 8g of iodine-loaded gel balls into 70g of 2wt% excess sodium carbonate aqueous solution, stir thoroughly for 30 minutes, and filter to obtain sodium alginate solution containing sodium carbonate and 1.7g of crude silver iodide.

[0041] Purification of silver iodide: the obtained crude silver iodide was first washed 4 times with 2g 2wt% hydrochloric acid aqueous solution, and then washed 2 times with 15g water; the washed silver iodide solid wa...

Embodiment 2

[0045] Preparation of gel balls: Mix 250g of 2wt% sodium alginate aqueous sol with 1g of silver chloride solid powder to form a sol mixture; drop the sol mixture into 5wt% calcium chloride aqueous solution to produce a gel precipitate; The gel precipitate was separated from the liquid phase system to obtain 7 g of gel spheres.

[0046] Adsorption of iodine ions: put the gel balls into 22 kg of brine containing 40 mg / L iodine, stir and adsorb for 36 hours to obtain 8 g of iodine-loaded gel balls.

[0047] Preparation of silver iodide: Put 8 g of iodine-loaded gel balls into 50 g of 3 wt % excess sodium oxalate aqueous solution, stir thoroughly for 30 minutes, and filter to obtain sodium alginate solution containing sodium oxalate and 1.7 g of crude silver iodide.

[0048] Purification of silver iodide: the obtained crude silver iodide was first washed 4 times with 2g 2wt% hydrochloric acid aqueous solution, and then washed 2 times with 15g water; the washed silver iodide solid ...

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Abstract

The invention relates to a method for preparing silver iodide by using iodine-contained brine. The method comprises the following steps of: step A, preparing gel balls, mixing aqueous sodium alginate solution and silver chloride to form mixed sol solution, dropping the mixed sol solution into aqueous calcium chloride solution to produce gel, and separating out the gel from the liquid phase system to obtain the gel balls; step B, adsorbing iodine ions, adsorbing the gel balls for a certain time in the iodine-contained brine to obtain the gel balls loaded with iodine; and step C, preparing the silver iodide, adding the gel balls loaded with the iodine into aqueous solution of alkaline salt, mixing sufficiently to produce solid precipitate, and filtering to obtain the silver iodide and the aqueous sodium alginate solution containing salt. According to the preparation method, the iodine-contained brine is used as the raw material, and the sodium alginate can be easily recycled, so that the production cost is greatly reduced; and besides, the preparation method has the characteristics that the process is simple and short, the reagent dosage is little, the requirement on equipment is low, the production process is easy to control, the requirement on production scale is low, and the popularization and application are convenient.

Description

【Technical field】 [0001] The invention relates to a method for preparing silver iodide, in particular to a method for preparing silver iodide by utilizing iodine-containing brine. 【Background technique】 [0002] Iodine is a very important chemical resource, widely used in food, medicine, agriculture, photosensitive materials, metallurgy, military and other fields. Zhang Hongying of Wengfu Group Co., Ltd. pointed out in "China's Iodine Resources and Iodine Chemical Production and Consumption" in 2011 that my country's iodine demand is 3000-4000t / a, and the annual growth rate in recent years has reached 20wt%. , but the annual output is only 300t, and the self-sufficiency rate is only 14.2wt%. [0003] Iodine is mainly stored in seaweed plants, oil and gas field brine, salt lake brine, rock minerals and sea water. At present, my country mainly uses seaweed, phosphate rock, brine, etc. as raw materials to extract iodine by ion exchange method or air blowing method. The proces...

Claims

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Application Information

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IPC IPC(8): C01G5/02
Inventor 郭敏张慧芳叶秀深刘海宁李权吴志坚
Owner QINGHAI INST OF SALT LAKES OF CHINESE ACAD OF SCI
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