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A method for extracting in a bismuth-iron mixed solution-ammonia water decomposition to separate bismuth-iron and producing pure bismuth hydroxide

A mixed solution, bismuth hydroxide technology, applied in the preparation of bismuth compounds, chemical instruments and methods, bismuth compounds and other directions, can solve the problems of single valence system and single valence state, and achieve complete separation of bismuth and iron, simple operation, The effect of short process flow

Active Publication Date: 2019-12-31
杨婷
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The article "Extraction performance of bismuth by N235 under the action of chloride ions" and the article "Cl - Extraction and removal of antimony and bismuth from copper electrolyte with N235 under the action of extraction" studied the extraction process of bismuth by N235, mainly for copper electrolyte, its valence state is relatively single, and the process route of extraction-stripping is also used; in short, The main characteristics of the current bismuth extraction practice are: a single element valence system, neutral or near-neutral extraction, extraction and stripping process routes, for the open circuit removal of iron from leachate and electrolyte in the process of acid leaching or electrowinning bismuth extraction no good effect

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  • A method for extracting in a bismuth-iron mixed solution-ammonia water decomposition to separate bismuth-iron and producing pure bismuth hydroxide

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Embodiment 1

[0037] This embodiment relates to a method for extracting from a mixed solution of bismuth and iron - decomposing and separating bismuth and iron and producing pure bismuth hydroxide.

[0038] The composition (g / L) of the bismuth-iron mixed solution as test raw material is: Bi T 37.6 Fe T 16.5 Fe 3+ 1.12. The acidity is 1.4g / L; the iron powder used for valence adjustment is reduced iron powder with a purity of Fe>98%.

[0039] Specific steps are as follows:

[0040]S1. Valence state adjustment: Weigh 500mL of the bismuth-iron mixed solution of the above ingredients, add 1.68g of reduced iron powder (1.5 times the theoretical amount), and react at 40°C for 3h; separate the supernatant and analyze the Fe in the solution 3+ The concentration of the iron is 0.10g / L, and the calculated reduction rate of iron is 91.10%;

[0041] S2. Extraction: Take all the adjustment solution obtained in step S1, add 200mL organic phase extractant, and its composition is: N235 concentration i...

Embodiment 2

[0044] This embodiment relates to a method for extracting from a mixed solution of bismuth and iron - decomposing and separating bismuth and iron and producing pure bismuth hydroxide.

[0045] Bismuth iron solution and reduced iron powder as test raw materials are the same as in Example 1.

[0046] Specific steps are as follows:

[0047] S1. Valence state adjustment: Weigh 500mL of the bismuth-iron mixed solution of the above ingredients, add 1.46g of reduced iron powder (1.3 times the theoretical amount), and react at 60°C for 2h; separate the supernatant and analyze the Fe in the solution 3+ The concentration of the iron is 0.07g / L, and the calculated reduction rate of iron is 93.80%;

[0048] S2. Extraction: Take all the adjustment solution obtained in step S1, add 200mL organic phase extractant, and its composition is: N235 concentration is 38.0%, TBP concentration is 15.0%, and sec-octanol concentration is 4.0%. Three countercurrent extractions were carried out, and the...

Embodiment 3

[0051] This embodiment relates to a method for extracting from a mixed solution of bismuth and iron - decomposing and separating bismuth and iron and producing pure bismuth hydroxide.

[0052] Bismuth iron solution and reduced iron powder as test raw materials are the same as in Example 1.

[0053] Specific steps are as follows:

[0054] S1. Valence state adjustment: Weigh 500mL of the bismuth-iron mixed solution of the above ingredients, add 1.23g of reduced iron powder (1.1 times the theoretical amount), and react at 70°C for 1h; separate the supernatant and analyze the Fe in the solution 3+ The concentration of the iron is 0.04g / L, and the calculated reduction rate of iron is 96.43%;

[0055] S2. Extraction: take all the adjustment solution obtained in step S1, and add 250 mL of organic phase extractant, which is composed of: N235 concentration of 28.0%, TBP concentration of 25.0%, and isooctyl alcohol concentration of 7.0%. Perform five countercurrent extractions, then s...

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Abstract

The invention discloses a method for extracting, decomposing and separating iron-bismuth and producing pure bismuth hydroxide from a bismuth-iron mixed solution, belonging to the field of non-ferrous metal metallurgy. The method first uses iron powder to reduce high-valent iron ions in the bismuth-iron mixed solution into Ferrous ions in a low-valent state are filtered and separated to obtain a low-priced bismuth-iron solution, and then a quaternary ammonium salt extractant is used to extract and separate bismuth from it to obtain a bismuth-rich organic phase and a ferrous raffinate, which can be directly opened; and The bismuth-rich organic phase is not stripped, and the ammonia water is directly decomposed to generate bismuth hydroxide, and the quaternary ammonium salt extractant is regenerated at the same time. The method realizes the separation of bismuth and iron through the valence adjustment and extraction process, and the separation of bismuth and iron is thorough; the innovative ammonia water decomposition step is used to directly complete the dissociation of bismuth, and the bismuth product and regenerated extractant are obtained in one step, which simplifies the process , reduce reagent consumption, and solve the problem of separation and separate utilization of bismuth iron solution in the process of bismuth smelting.

Description

technical field [0001] The invention belongs to the field of non-ferrous metal metallurgy, and more specifically relates to a method for extracting in a bismuth-iron mixed solution-ammonia decomposition to separate iron-bismuth and producing pure bismuth hydroxide. Background technique [0002] The smelting of bismuth includes pyrotechnics and wet-processes. The pyrotechnics include smelting smelting, precipitation smelting, reaction smelting, mixed smelting and other enhanced smelting technologies such as side-blown smelting, which have the disadvantages of large reagent consumption, low direct yield and cost High disadvantages; wet bismuth smelting is mainly based on acid method, including ferric chloride leaching-iron powder replacement method, ferric chloride leaching-diaphragm electrodeposition method, ferric chloride leaching-hydrolysis bismuth precipitation method, chlorine gas selective leaching The principle is based on the leaching of bismuth sulfide ore by strong ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22B3/44C22B3/26C22B30/06C01G29/00
CPCC01G29/003C22B3/44C22B30/06C22B3/26Y02P10/20
Inventor 叶龙刚欧阳臻胡宇杰肖利陈艺锋夏志美
Owner 杨婷