Process for combined production of polyferric sulfate and ferric trichloride by two-step acid dissolution method of fine iron powder

A technology for polymerizing ferric sulfate and ferric chloride, which is applied in the direction of ferric sulfate and ferric halide, can solve the problem of no joint production of polymeric ferric sulfate and ferric chloride, and achieve the effect of broadening the production process and reducing production costs

Active Publication Date: 2019-04-02
焦作市煜乾环保科技有限公司 +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, there is currently no process for the joi

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  • Process for combined production of polyferric sulfate and ferric trichloride by two-step acid dissolution method of fine iron powder

Examples

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Example Embodiment

[0034] Example 1

[0035] Such as figure 1 As shown, the two-step acid solution method for co-producing polyferric sulfate and ferric chloride of iron fine powder includes the following steps:

[0036] 1) Add iron fine powder to dilute sulfuric acid for leaching to obtain the first step acid solution; iron fine powder is magnetically separated hematite powder, with a particle size of 100-200 mesh, total iron content above 50%, leaching The step is carried out in an acid-resistant reactor, the mass concentration of the dilute sulfuric acid is 25%, the mass ratio of the total iron in the iron fine powder to the sulfuric acid in the dilute sulfuric acid is 1:2.0; the leaching conditions include: the pressure is normal pressure, the temperature is 110°C, leaching time is 1.5 hours;

[0037] 2) Use magnesite powder to adjust the acidity of the acid in the first step; this adjustment step is completed in the acid-resistant adjustment tank, mainly to adjust the Fe in the acid in the first...

Example Embodiment

[0044] Example 2

[0045] Such as figure 1 As shown, the two-step acid solution method for co-producing polyferric sulfate and ferric chloride of iron fine powder includes the following steps:

[0046] 1) Add iron fine powder to dilute sulfuric acid for leaching to obtain the first step acid solution; iron fine powder is pyrite slag without magnetic separation, its particle size is 100-200 mesh, and the total iron content is above 50% The leaching step is carried out in an acid-resistant reactor, the mass concentration of the dilute sulfuric acid is 35%, the mass ratio of the total iron in the iron fine powder to the sulfuric acid in the dilute sulfuric acid is 1:2.5; the leaching conditions include: the pressure is 1kgf / cm² , The temperature is 120℃, and the leaching time is 1.5 hours;

[0047] 2) Use ferrous sulfate solid to adjust the acidity of the acid in the first step; this adjustment step is completed in the acid-resistant adjustment tank, mainly to adjust the Fe in the aci...

Example Embodiment

[0054] Example 3

[0055] Such as figure 1 As shown, the two-step acid solution method for co-producing polyferric sulfate and ferric chloride of iron fine powder includes the following steps:

[0056] 1) Add iron fine powder to dilute sulfuric acid for leaching to obtain the first step acid solution; iron fine powder is magnetite powder that has been magnetically separated, with a particle size of 100-200 mesh and total iron content above 50%. The step is carried out in an acid-resistant reactor, the mass concentration of the dilute sulfuric acid is 45%, the mass ratio of the total iron in the iron fine powder to the sulfuric acid in the dilute sulfuric acid is 1:3.0; the leaching conditions include: the pressure is 1.5kgf / cm², The temperature is 110°C, and the leaching time is 1.8 hours;

[0057] 2) Use magnesite powder to adjust the acidity of the acid in the first step; this adjustment step is completed in the acid-resistant adjustment tank, mainly to adjust the Fe in the acid ...

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Abstract

The invention belongs to the technical field of chemical production processes, and discloses a process for combined production of polyferric sulfate and ferric trichloride by a two-step acid dissolution method of fine iron powder. The process comprises the following steps: adding the fine iron powder into diluted sulfuric acid, and carrying out leaching so as to obtain a first-step acid solution;adjusting the acidity of the first-step acid solution with magnesite powder or ferrous sulfate solid; subjecting an obtained acid solution to press filtration so as to obtain a first-step filtrate anda first-step filter residue; oxidizing the first-step filtrate so as to produce a polyferric sulfate liquid; mixing the first-step filter residue with the fine iron powder, and adding an obtained mixture into hydrochloric acid for dissolution so as to obtain a second-step acid solution; adjusting the acidity of the second-step acid solution with the magnesite powder or ferrous chloride solid; subjecting an obtained acid solution to press filtration, backwashing a filter residue, and carrying out drying under blowing with air so as to obtain a second-step filtrate, a backwashed solution and asecond-step filter residue; and oxidizing the second-step filtrate so as to produce a ferric trichloride liquid. The process provided by the invention realizes combined production of the polyferric sulfate and the ferric trichloride, maximumly utilizes the content of iron in the fine iron powder, and reduces the cost of production.

Description

technical field [0001] The invention belongs to the technical field of chemical production technology, and in particular relates to a process for the co-production of polyferric sulfate and ferric chloride by a two-step acid-dissolving method of iron fine powder. Background technique [0002] The preparation method of existing polyferric sulfate generally comprises: firstly adopt the ferric sulfate solution that the waste residue containing ferric iron reacts with sulfuric acid to obtain; , or its mixture is added to the ferric sulfate solution, and the reaction temperature is controlled to be 40-110°C, so that a part of Fe in the solution 3+ After reduction, filter, add an oxidant to the filtrate, control the oxidation temperature at 40-130°C, and remove Fe 2+ Complete oxidation to obtain a reddish-brown polymeric ferric sulfate solution; the basicity of the polymeric ferric sulfate is controlled at 0-28%. In addition, there is currently no process for the joint productio...

Claims

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Application Information

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IPC IPC(8): C01G49/14C01G49/10
CPCC01G49/10C01G49/14
Inventor 胡先国张彬彬
Owner 焦作市煜乾环保科技有限公司
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