Method for producing ferrous oxalate from hematite

A technology for ferrous oxalate and hematite, which is applied in the preparation of carboxylate, organic chemistry, etc., can solve the problems of being unsuitable for large-scale industrial production, high production cost, etc., and achieve the effects of cheap and easy-to-obtain raw materials and simple process.

Inactive Publication Date: 2007-12-12
GUIZHOU BRANCH CHINA ALUMINUM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a kind of low-cost raw material for the problem that both ammonium oxalate and ferrous sulfate are chemical raw materials in the production method of ferrous oxalate existing in the prior art, the production cost is better, and are not suitable for large-scale industrial production. Method for producing ferrous oxalate from hematite with easy access, simple process and no environmental pollution

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] (1) Sample preparation

[0014] The hematite is crushed and ground to a particle size of -150 μm, and then concentrated into 65% ore powder by magnetic separation. The content of total iron and ferrous iron is determined in Table 1:

[0015] Iron content of table 1 hematite powder

[0016] mineral name

total iron T Fe %

FeO%

Fe 2 o 3 %

Hematite

64.35

8.54

83.11

[0017] (2) acid soluble

[0018] Add 2g of hematite powder to 100mL of oxalic acid solution with a weight percentage of 15%, stir and leaching at 80°C, and the reaction time is 4h, so that the oxides of iron in various valence states in hematite can be Free in the solution, the dissolution rate is above 85%. The chemical reaction formula of the acid dissolution process is: Fe 2 o 3 +6H 2 C 2 o 4 →2H 3 Fe(C 2 o 4 ) 3 +3H 2 o

[0019] (3) Light restoration

[0020] Filtrate while it is hot, let the leaching solution stand under natura...

Embodiment 2

[0028] (1) Sample preparation

[0029] The hematite is crushed and ground to -75 μm, and then concentrated into 65% ore powder by magnetic separation. The content of total iron and ferrous iron is determined in Table 1:

[0030] Iron content of table 1 hematite powder

[0031] mineral name

total iron T Fe %

FeO%

Fe 2 o 3 %

Hematite

65.33

8.81

83.56

[0032] (2) acid soluble

[0033] Add 2g of hematite powder to 100mL of oxalic acid solution with a weight percentage of 20%, stir and leaching at 85°C, and the reaction time is 5h, so that the oxides of iron in various valence states in hematite can be Free in the solution, the dissolution rate is over 90%. The chemical reaction formula of the acid dissolution process is: Fe 2 o 3 +6H 2 C 2 o 4 →2H 3 Fe(C 2 o 4 ) 3 +3H 2 o

[0034] (3) Light restoration

[0035] Filtrate while it is hot, let the leaching solution stand under natural light conditions, a...

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Abstract

The invention relates to a method for producing ferrous oxalate taking bloodstone as raw material with acid- disslovation- irradiation reduction process. It is characterized in that it comprises following steps: disintegrating bloodstone, grinding, refining and getting mineral powder with TFe content larger than 65%; adding mineral powder into ferrous oxalate solution, stirring and extracting at 80- 85 Deg. C for 1- 6 hours; filtering at high temperature, stewing filterate under irradiation for 3d- 7d for reduction, getting light yellow ferrous oxalate crystal, separating crystal and getting vacuum drying it at 60 Deg. C and 13.3 Kpa for 1- 3 hours, getting ferrous oxalate. The invention employs bloodstone to replace ferric persulfate, employs oxalic acid to repalce ammonium oxalate. The invention is characterized by easy to get raw material, simple process, no environmental pollution and suitability for large- sacle industrial production.

Description

technical field [0001] The invention relates to a method for producing ferrous oxalate from hematite, which relates to a method for producing ferrous oxalate, in particular to a method for producing ferrous oxalate by using hematite as a raw material and adopting an acid-dissolution-light reduction two-step method. Background technique [0002] Ferrous oxalate is an organic chemical product. In addition to being used as a chemical reagent, it is also used in coatings, dyes, ceramic enamel, optical glass and glassware coloring, the preparation of photosensitive materials, and the production of nano-iron oxide. [0003] At present, the production method of ferrous oxalate formed by the reaction of ammonium oxalate and ferrous sulfate is adopted in industry. Dissolve the ammonium oxalate and ferrous sulfate crystals in water respectively, then add the ammonium oxalate solution into the ferrous sulfate solution, and stir continuously in a stainless steel reaction pot to form a l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C07C55/06C07C51/41
Inventor 周吉奎李军亮曹慧君
Owner GUIZHOU BRANCH CHINA ALUMINUM IND
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