CN1034228C - Iron-removing process by solvent extraction - Google Patents

Abstract

The present invention relates to an iron-removing technology by solvent extraction, which comprises working procedures of extraction, back extraction, depositing iron conversion, etc. The present invention is characterized in that the working procedure of back extracting iron selects NH4F to serve as anti-iron agents of an iron-rich organic phase, and the working procedure of depositing iron conversion adopts NH4OH to serve as depositing iron converting agents. Compared with the original technology, the present invention has a series of advantages of easy regeneration of back extracting agents, high anti-iron ratio, easy filtration of Fe (OH) 3 deposition, simple technology, low cost, no acid mist, favorable environment, etc.

Description

A kind of method of removing deironing in the rich iron organic phase of non-ferrous metal from collection

The present invention relates to a kind of method of removing deironing in the rich iron organic phase of non-ferrous metal from collection.

Solvent extraction technology is a method commonly used in the non-ferrous metal wet smelting process, and the iron that exists in solution often is used as impurity and need removes.

U.S. Pat 4497655 discloses a kind of self-contained Fe ³⁺Deironing and thermal degradation (NH in the organic solution (as Phosphorus collection liquid) ₄) ₃FeF ₆Method, promptly adopt NH ₄F makes iron removing reagent, deironing from organic solution, and its chemical reaction is:

(1)

Then, adopt thermal decomposition method with (NH ₄) ₃FeF ₆Thermal degradation is given birth to NH ₄F and HF, its reaction formula is:

(2)

Problem is that reaction (2) not only need consume heat energy, and the NH that generates ₄F and HF are gas, and it is cumbersome reclaiming them from gas.

The object of the present invention is to provide that a kind of technology is simple, iron back extraction ratio height, reverse-extraction agent be easy to regeneration, the method for deironing in rich iron organic phase is to overcome above-mentioned shortcoming.

Of the present invention from the method for collection except that deironing in the rich iron organic phase of non-ferrous metal, comprise and use 2-4N NH ₄F makes iron removing reagent, back extraction iron and heavy iron conversion procedure from rich iron organic phase, and the chemical reaction of back extraction ironworker preface is expressed as:

The invention is characterized in that described heavy iron conversion procedure obtains (NH with back extraction iron ₄) ₃FeF ₆Add ammoniacal liquor (NH ₄OH) regulate pH value 7-9, make it to be converted into Fe (OH) ₃Precipitation makes NH simultaneously again ₄F regeneration and return the operation of use, its chemical reaction is:

Of the present inventionly remove the method for deironing in the rich iron organic phase of non-ferrous metal from collection, compare with existing old technology, not only technology is simple, and have energy-conservation, reverse-extraction agent is easy to regenerate, Fe (OH) ₃Precipitation slag is easy to advantages such as filtering separation.

Further set forth the present invention below in conjunction with embodiment.

Zinc hydrometallurgy contains the low sour supernatant liquor of Fe, and its major ingredient is as follows: (g/L)

Zn 116.29，Fe 15.19，In 0.09，SiO ₂ 0.145，

Sn 0.145，H ₂SO ₄ 16.64

Deferrization process concrete steps of the present invention are as follows:

1, extraction: the low sour supernatant liquor organic extractant P that will contain Fe ₂₀₄During extraction non-ferrous metal element, Fe ³⁺Also be extracted into organic phase simultaneously, behind the non-ferrous metal element in the HCl back extraction organic phase, obtain rich iron organic phase (FeR ₃), send down the back extraction operation in road to handle, the condition of this extraction process is an organic phase and the ratio (volume ratio) of water is 1: 2, mixing time 5 minutes, 3 grades.

2, back extraction: with concentration is the NH of 2-4N ₄F makes iron removing reagent, back extraction iron from rich iron organic phase, and back extraction is 1 with the volume ratio of organic phase: 1-15, reaction times 4-6 minute, the back extraction ratio of iron was 90-95%, the back extraction operation mainly makes the Fe in the rich iron organic phase ³⁺By back extraction and generation (NH ₄) ₃FeF ₆Precipitation, the reverse-extraction agent of back extraction non-ferrous metal element (mainly being indium) is a 6N hydrochloric acid, organic phase is 15: 1 with back extraction volume ratio mutually, the reverse-extraction agent of back extraction iron is the NH of 3N ₄F, back extraction is 1: 1 with the volume ratio of organic phase, 5 minutes reaction times.

3, heavy iron transforms: (the NH that back extraction ironworker preface is obtained ₄) ₃FeF ₆Add ammoniacal liquor (NH ₄OH) regulate pH value to 8.5, make (NH ₄) ₃FeF ₆Be converted into Fe (OH) ₃Precipitation makes NH simultaneously ₄Use is returned in F regeneration.

Accompanying drawing is a process flow sheet.

Claims (1)

1, a kind of from the method for collection except that deironing in the rich iron organic phase of non-ferrous metal, it comprises the NH with 2-4N ₄F makes iron removing reagent, back extraction iron and heavy iron conversion procedure from rich iron organic phase, and the chemical reaction of back extraction ironworker preface is expressed as:

The invention is characterized in that described heavy iron conversion procedure obtains (NH with back extraction iron ₄) ₃FeF ₆Add ammoniacal liquor (NH ₄OH) regulate pH value 7-9, make it to be converted into Fe (OH) ₃Precipitation makes NH simultaneously again ₄F regeneration and return the operation of use, its chemical reaction is:

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