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Preparation method of thallous iodide

A technology of thallium iodide and iodide, which is applied in the field of metal compound preparation, can solve the problems of thallium iodide with many impurities, complicated purification, and high content of heavy metals, and achieve the effects of simple preparation method, low cost and reduced emissions

Inactive Publication Date: 2018-06-29
GUANGZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The Chinese invention patent (application number 201410114415.1) discloses "a method for preparing thallium iodide from lead-zinc ore smelting wastewater as raw material". Lime precipitation makes sediment as adsorbent, extracts thallium from waste water to prepare thallium iodide; this method can reduce the cost of preparing thallium iodide; however, there are some shortcomings: lead-zinc ore is a polymetallic mineral, lead-zinc ore The heavy metal content in waste residue and smelting wastewater is high, and the obtained thallium iodide has many impurities, and the purification is complicated

Method used

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Embodiment 1

[0054] The present embodiment provides a kind of preparation method of thallium iodide, it comprises the following steps:

[0055] S1) Grinding and pulverizing the sulfuric acid ash, adding sulfuric acid waste water to the pulverized sulfuric acid ash, stirring to obtain the mixed solution I; adjusting the pH value of the mixed solution I to 9-10 with an alkaline reagent, and then proceeding sequentially filtering, drying and pulverizing to obtain bottom sludge powder; the pH value of the sulfuric acid wastewater is 1-2;

[0056] S2) adding sulfuric acid wastewater to the bottom mud powder, and stirring to obtain a mixed solution II; adjusting the pH value of the mixed solution II to 1-1.5 with an acidic reagent, and filtering to obtain a thallium extract;

[0057] S3) adding iodide to the thallium extract, and retrieving TlI by precipitation in a cold water bath to obtain crude TlI;

[0058] S4) adding ethanol to the Tll crude product, recovering the TlI ethanol solution;

...

Embodiment 2

[0061] This embodiment provides a preparation method of thallium iodide. The sulfuric acid wastewater and sulfuric acid ash in the raw materials come from a sulfuric acid factory in Yunfu. The content of thallium in the sulfuric acid wastewater is 0.34 mg / kg, and the content of thallium in the sulfuric acid ash is 57 mg / kg. kg, sulfuric acid ash also contains the following components in weight percentage: Fe 2 o 3 33%, Fe 3 o 4 35%; The preparation method specifically comprises the following steps:

[0062] S1) Grind sulfuric acid ash (the particle size of sulfuric acid ash after pulverization is ≤0.08mm), pass through a 200-mesh sieve, take 5kg of sulfuric acid ash, add 10kg of sulfuric acid waste water to the sulfuric acid ash; stir for 48-72h, and filter To obtain mixed solution I, add lime water to adjust the pH value of mixed solution I to 9-10; after standing overnight, filter and dry successively, and obtain 5 g of bottom mud powder after crushing;

[0063] S2) Ad...

Embodiment 3

[0069] This embodiment provides a preparation method of thallium iodide. The sulfuric acid wastewater and sulfuric acid ash in the raw materials come from a sulfuric acid factory in Yunfu. The content of thallium in the sulfuric acid wastewater is 0.32 mg / kg, and the content of thallium in the sulfuric acid ash is 51 mg / kg. kg, sulfuric acid ash also contains the following components in mass percentage: Fe 2 o 3 30%, Fe 3 o 4 40%; The preparation method specifically comprises the following steps:

[0070] S1) Grind sulfuric acid ash (the particle size of sulfuric acid ash after pulverization is ≤0.08mm), pass through a 200-mesh sieve, take 10kg of sulfuric acid ash, add 25kg of sulfuric acid waste water to the sulfuric acid ash; stir for 48-72h, and filter To obtain mixed solution I, add lime solution to adjust the pH value of mixed solution I to 9-10; after standing overnight, filter and dry in sequence, and after crushing, 10g of bottom mud powder is obtained;

[0071]...

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Abstract

The invention discloses a preparation method of thallous iodide, and belongs to the technical field of metal compounds. The preparation method is characterized in that ash slag of sulfuric acid, wastewater of sulfuric acid and iodide are used as raw materials to prepare; the ash slag of sulfuric acid is prepared from Fe2O3 (ferric oxide), Fe3O4 (ferroferric oxide), TlF (thallium fluoride) and TlF3 (thallium trifluoride); the sulfur acid waste water contains HF (hydrogen fluoride) and Tl<+>. The preparation method of the thallous iodide has the advantages that the production cost is reduced, and the purer product can be obtained.

Description

technical field [0001] The invention belongs to the technical field of metal compound preparation, and in particular relates to a preparation method of thallous iodide. Background technique [0002] Thallium iodide (TlI) can improve the transmittance of the fiber to the carbon dioxide laser, making its performance better than that of the silica fiber. The high-pressure mercury thallium lamp filled with thallium iodide is a green light source. Thallium iodide is used as an additive to cooperate with other luminescent materials to improve the photoelectric performance of the lamp; thallium iodide is widely used in the production of signal lamps and special light sources for chemical light reactions, etc. field. Thallous iodide is usually prepared from metal thallium by dissolving in nitric acid and precipitating potassium iodide; this preparation method is relatively expensive. [0003] According to "Thallium, 2015 World Market Review and Forecast", China, Kazakhstan and Rus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G15/00
CPCC01G15/00C01P2006/80
Inventor 吴颖娟陈永亨张平罗定贵黄雪夏刘娟李祥平
Owner GUANGZHOU UNIVERSITY
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