Fluosilicic acid comprehensive recycling technology
A technology of fluosilicic acid and process, which is applied in the field of comprehensive recovery and utilization of fluosilicic acid to achieve the effects of avoiding environmental pollution, improving absorption efficiency, and reducing production and operation costs
Inactive Publication Date: 2017-04-26
杨海
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Problems solved by technology
[0007] The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a comprehensive recovery and utilization process of fluosilicic acid. The waste utilization of the by-products in the process reduces environmental pollution and increases the comprehensive utilization of fluorosilicic acid. The present invention provides a new solution technology: a new comprehensive recovery and utilization transformation process of fluorosilicic acid, which is characterized in that: The main material used in the invention is the by-product fluosilicic acid produced by the fluorine absorption system in the production process of calcium superphosphate and wet-process phosphoric acid
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[0014] The present invention will be described in detail below with reference to the accompanying drawings. The process flow is: material reaction process: add clean water into the fluorine absorption circulation tank, and after the fluorine gas is absorbed and overflowed, the circulation liquid enters the low-concentration fluorosilicic acid storage tank and enters the defluorination system after cooling and precipitation, and removes the silica gel after defluorination and filtration Defluorination residue and filter residue are used as product fillers, most of the filtrate is used for diluting sulfuric acid, and a very small part overflows through the high-level pool to the circulation tank and newly replenished clean water for re-absorption cycle. This process performs a cycle, which effectively reduces At the same time as the temperature and concentration of the absorption liquid, it can effectively remove most of the fluorine element in the absorption liquid, fully improv...
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The invention relates to a fluosilicic acid comprehensive recycling technology. The technology is characterized in that calcium superphosphate and a by-product, namely fluosilicic acid, generated by a fluorine absorption system in the wet-process phosphoric acid production technology are used as main materials. The technology includes the material reaction step, wherein clean water is added into a fluorine absorption circulating tank, after overflowing fluorine-containing gas is cyclically absorbed, circulating liquid enters a low-concentration fluosilicic acid storage tank and then enters a defluorination system after being cooled and precipitated, silica gel defluorination residues are removed after defluorination and filtering, filter residues serve as product filler, most of filter liquor serves as diluting sulfuric acid, very little part of the filter liquor overflows to the circulating tank through a high-place pond and absorbed and circulated again with newly added clean water, and sulfuric acid consumption is reduced; clean water circulating liquid injected into the fluorine absorption circulating tank for the first time is absorbed and then conveyed to the high-place low-concentration fluosilicic acid (1.5-1.8 baume degrees) storage tank to serve as diluted concentrated sulfuric acid, and remaining circulating liquid enters the fluorine absorption circulating tank to be absorbed. The technology has the advantage of effectively achieving the aims of energy conservation, emission reduction and efficient comprehensive recycling.
Description
technical field [0001] This patent relates to the absorption liquid produced by the absorption of fluorine-containing gas produced when sulfuric acid decomposes phosphate rock, and the technical field of fluosilicic acid production, specifically related to the production process of calcium superphosphate and fluorine in the production process of wet-process phosphoric acid. A comprehensive recovery and utilization process of fluosilicic acid produced by the absorption system. Background technique [0002] Fluosilicic acid is also called hydrofluoric acid. Unstable and easy to decompose into silicon tetrafluoride and hydrogen fluoride. When the concentration reaches 8-10 degrees Baume, its aqueous solution is colorless and strongly acidic, and has corrosive properties to attack glass. It is usually stored in containers made of industrial ceramics or plastics. Fluorosilicic acid has disinfection properties and is used to make fluorosilicate and cryolite, and is used in electr...
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IPC IPC(8): C01B33/10
CPCC01B33/103
Inventor 杨海
Owner 杨海
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