Fluosilicic acid for lead electrolysis and preparation method thereof

A technology of fluorosilicic acid and lead electrolysis, which is applied in the preparation of fluorosilicic acid for lead electrolysis and the field of fluorosilicic acid for lead electrolysis, which can solve the problem of decreasing the content of fluorosilicic acid, increase the preparation operation process of lead electrolyte, and increase the amount of lead electrolyte production cost etc.

Active Publication Date: 2020-10-16
QINGHAI TONGXIN CHEM
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has the following problems: when fluosilicic acid is produced, the production process determines that fluosilicic acid contains hydrogen fluoride and sulfuric acid impurity components. In addition, under certain conditions, fluosilicic acid decomposes to generate hydrogen fluoride, resulting in a decrease in the content of fluosilicic acid.
In addition, during lead electrolysis, the added lead oxide will react with hydrogen fluoride and sulfuric acid to generate PbF 2 , PbSO 4 Precipitation, on the one hand, increases the amount of lead oxide, greatly increasing the production cost of lead electrolyte, on the other hand, it is necessary to 2 , PbSO 4 Precipitation for separation, increasing the lead electrolyte preparation process

Method used

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  • Fluosilicic acid for lead electrolysis and preparation method thereof
  • Fluosilicic acid for lead electrolysis and preparation method thereof
  • Fluosilicic acid for lead electrolysis and preparation method thereof

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preparation example Construction

[0038] like figure 1 As shown, one aspect of the present invention provides a preparation method S100 of fluosilicic acid for lead electrolysis, which specifically includes the following steps S110-S130:

[0039] S110, providing a low-grade fluosilicic acid solution, the low-grade fluosilicic acid solution doped with hydrogen fluoride impurities and sulfuric acid impurities.

[0040] It should be noted that the low-grade fluosilicic acid solution provided in this example is a by-product when producing anhydrous hydrogen fluoride, and the main components it contains are: H 2 SiF 6 , HF, H 2 SO 4 , for the lead electrolysis industry, the doped hydrogen fluoride impurities and sulfuric acid impurities have certain adverse effects, and further removal is required to obtain higher-purity fluosilicic acid, so that the low-grade fluosilicic acid can be effectively used, which requires Analyze the content of each component, and then remove the corresponding impurities according to...

Embodiment 1

[0057] This embodiment provides a method for preparing fluosilicic acid for lead electrolysis, and the specific preparation process includes the following steps:

[0058] S1. Provide low-grade fluorosilicic acid, and analyze the components and content of low-grade fluorosilicic acid, and the result is H 2 SiF 6 : 24.09%, HF: 19.75%, H 2 SO 4 : 1.14% (mass percentage, the same below), according to the analysis results, 799.32g of this low-grade fluorosilicic acid was weighed.

[0059] S2, according to the result in step S1, according to molar ratio (6HF):(SiO 2 )=1:2 Calculate the theoretical amount of quartz sand, and weigh 163.77g of quartz sand according to the molar ratio relationship between the theoretical amount and the actual amount, wherein, the particle diameter of the quartz sand used in this embodiment ranges from 0.5mm to 2mm, and the The crystal morphology of quartz sand is as figure 2 shown.

[0060] Add the quartz sand in the above step to the low-grade f...

Embodiment 2

[0065] This embodiment provides a method for preparing fluosilicic acid for lead electrolysis, and the specific preparation process includes the following steps:

[0066] S1. Provide low-grade fluorosilicic acid, and analyze the result of low-grade fluorosilicic acid as H 2 SiF 6 : 24.09%, HF: 19.75%, H 2 SO 4 : 1.14%, weighed 800.75 g of the low-grade fluorosilicic acid according to the analysis results.

[0067] S2, according to the result in step S1, according to molar ratio (6HF):(SiO 2 )=1:2 to calculate the theoretical amount of quartz sand, and weigh 164.14g of quartz sand according to the molar ratio between the theoretical amount and the actual amount. The quartz sand used in the example is figure 2 The quartz sand with the crystal morphology shown is obtained after calcining at 800°C for 12 hours. The crystal morphology of the quartz sand is as follows image 3 and Figure 4 As shown, it is a hexagonal column with a loose porous structure, a large specific su...

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Abstract

The invention provides fluosilicic acid for lead electrolysis and a preparation method thereof, and belongs to the technical field of chemistry and chemical engineering. The preparation method comprises the steps that a low-grade fluosilicic acid solution is provided, and the low-grade fluosilicic acid solution is doped with hydrogen fluoride impurities and sulfuric acid impurities; a certain amount of quartz sand is added into the low-grade fluosilicic acid solution for reaction, so that hydrogen fluoride impurities are removed for the first time, and first clear liquid is obtained; and a certain amount of lead oxide is added into the first clear liquid for reaction, so that sulfuric acid impurities are removed, meanwhile, the remaining hydrogen fluoride impurities are removed for the second time, second clear liquid is obtained, and the second clear liquid is fluosilicic acid for lead electrolysis. By adopting the quartz sand with special crystal morphology, hydrogen fluoride impurities can be effectively removed; sulfuric acid impurities and remaining hydrogen fluoride impurities are removed through lead oxide, the total removal rate of the hydrogen fluoride impurities reaches 99% or above, the total removal rate of the sulfuric acid impurities reaches 98% or above, the impurity removal rate is high, the preparation process is simple, and the cost is low.

Description

technical field [0001] The invention belongs to the technical field of chemistry and chemical engineering, and in particular relates to a preparation method of fluorosilicic acid for lead electrolysis and a kind of fluorosilicic acid for lead electrolysis. Background technique [0002] Fluorosilicate Molecular Formula H 2 SiF 6 , Molecular weight 144.09, the aqueous solution is a colorless transparent fuming liquid, the relative density is about 1.32, the boiling point is 108.50 ℃, has a pungent smell, is volatile, soluble in water, the highest concentration is 60.92%, and there is no anhydrous product. The acid is highly toxic, can corrode mucous membranes, eyes and skin, has strong corrosion to skin, and is poisonous to human respiratory organs; it is the preparation of sodium fluorosilicate, potassium, ammonium, magnesium, copper, barium, lead and other The basic raw material of silicate and silicon tetrafluoride, used in metal electroplating, wood preservation, brewing...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/10C25C1/18
CPCC01B33/103C25C1/18C01P2006/80
Inventor 任忠虎安东刘泽巨李龙伍杨占菊黎碧玉马福元李振昌刘世浩杜国栋
Owner QINGHAI TONGXIN CHEM
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