A kind of preparation method of high-purity fecl2·4h2o

Abstract

The invention discloses a preparation method of high-purity FeCl2.4H2O. The preparation method comprises the following processes for preparing the high-purity FeCl2.4H2O: by taking hot galvanizing waste acid as a raw material, filtering, reducing, performing vacuum distillation, recycling mother liquor, and the like. According to the embodiment of the invention, the problem of influence of Zn<2+> on the FeCl2.4H2O purity and FeCl2 use scope can be solved, the comprehensive utilization rate of FeCl2 is increased and the problems of high cost, single product and secondary pollution of extraction of high purity FeCl2.4H2O from waste acid can be solved. The invention provides a new method for recycling hot galvanizing waste acid. The waste acid is subjected to simple and low-consumption process, so that the purpose of increasing the additional value of products is achieved, the environment pressure is effectively reduced and the economic benefit of the enterprise is increased.

Description

technical field [0001] The invention belongs to the technical field of high-purity material preparation, in particular to a high-purity FeCl 2 4H 2 O preparation method. Background technique [0002] Hot-dip galvanizing is the most widely used steel surface treatment method with the best cost performance in the world today. Hot-dip galvanized products play an irreplaceable role in corrosion reduction and life extension of steel, energy saving and material saving. At the same time, coated steel is also a high value-added short-term product supported and prioritized by the state. However, a large amount of waste acid produced in the hot-dip galvanizing process is difficult deal with. If these waste acids are discharged directly, it will not only cause serious environmental pollution, but also reduce the economic benefits of enterprises. In order to realize the resource treatment of waste acid, protect the environment, save and rationally utilize resources, domestic and for...

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Problems solved by technology

[0003] In the prior art, there is a resource recovery method for hot-dip galvanizing acidic waste liquid, which mainly uses the diffusion dialysis method to treat the hot-dip galvanizing waste liquid, and obtains the waste water containing HCl and a small amount of Zn respectively. 2+ and the recovery liquid of its complexes and containing Fe 2+ , Zn 2+ Residual liquid, the method equipment requirements are high, the treatment process is complicated, and a large amount of waste liquid is still by-produced; and FeCl 2 4H 2 O is the preparation of FeCl 3 The main raw material, FeCl 3 Widely used in the tap water industry, residues in FeCl 2 4H 2 O Zn 2+ Belongs to heavy metal ions, will pollute tap water

In addition, the treatment method of galvanizing waste acid is to prepare superparamagnetic ferroferric oxide nanoparticles by co-precipitation method, using superparamagnetic ferroferric oxide as the core, and coating the surface of ferroferric oxide by hydrolysis One or more layers of silica shell, using the principle of coupling reaction, to modify the core coated with silica, using 3-aminopropyltrimethoxysilane as the modifying agent, on the core-shell structure Carry out modification to connect amino groups, and then use it to adsorb zinc in waste galvanizing acid, which contains Zn in waste galvanizing acid 2+ , Fe 2+ and hydrochloric acid, selective adsorption of Zn at room temperature 2+ ions to separate zinc, but there are also problems such as complex processing methods

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