Method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution

A magnesia chromite ore and leaching solution technology, which is applied in the direction of chromium sulfate, etc., can solve the problems such as the difficulty of removing impurities in the magnesia chromite sulfuric acid leaching solution, and achieve the effects of mild conditions, saving equipment space, and shortening the process flow

Active Publication Date: 2014-07-23
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at the deficiencies in the prior art and solving the problem of difficult removal of impurities in the sulfuric acid leaching solution of magnesia chromite ore, the invention provides a method for preparing basic chromium sulfate from magnesia chromite sulfur

Method used

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  • Method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution
  • Method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution
  • Method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution

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Embodiment 1

[0031] Using 100mL magnesium chromite sulfuric acid leaching solution as raw material, the concentration of metal ions in the leaching solution is [Cr 3+ ]=34.6g / L, [Fe 3+ ]=26.6g / L, [Mg 2+ ] = 5.0 g / L.

[0032] use as figure 1 Shown magnesia chromite ore sulfuric acid leaching solution produces the schematic diagram of the technological process of basic chromium sulfate, and the present embodiment magnesia chromite ore sulfuric acid leaching solution produces the method for basic chromium sulfate, and concrete steps are as follows:

[0033] Step 1: Adjust the magnesium chromite sulfuric acid leaching solution to 70°C, place it in a constant temperature tank with a stirring device, slowly add iron filings into the container and start stirring, after 15 minutes of reaction, take 2 mL of the reaction solution every 5 minutes for use Potassium thiocyanate for Fe 3+ Detection, after 25 minutes of reaction, it was detected that there was no Fe in the reaction solution 3+ exist...

Embodiment 2

[0042] Taking 100mL of magnesium chromite sulfuric acid leaching solution as raw material, the concentration of metal ions in the solution is [Cr 3+ ]=38.1g / L, [Fe 3+ ]=24.7g / L, [Mg 2+ ]=3.4g / L.

[0043] Present embodiment magnesia chromite ore sulfuric acid leaching solution produces the method for basic chromium sulfate, and concrete steps are as follows:

[0044] Step 1: Adjust the magnesium chromite sulfuric acid leaching solution to 40°C, place it in a constant temperature tank with a stirring device, slowly add iron filings into the container and start stirring, after 35 minutes of reaction, take 2 mL of the reaction solution every 5 minutes for use Potassium thiocyanate for Fe 3+ Detection, after 10 minutes of reaction, it was detected that there was no Fe in the reaction solution 3+ exist, stop heating and stirring;

[0045] Step 2: Filter the sample to get the filtrate, at this time Fe in the filtrate 3+ Has been completely reduced to Fe by iron filings 2+ , th...

Embodiment 3

[0053] With 500mL magnesium chromite sulfuric acid leaching solution as raw material, the concentration of metal ions in the solution is [Cr 3+ ]=42.7g / L, [Fe 3+ ]=29.6g / L, [Mg 2+ ]=6.2g / L.

[0054] Present embodiment magnesia chromite ore sulfuric acid leaching solution produces the method for basic chromium sulfate, and concrete steps are as follows:

[0055] Step 1: Adjust the magnesium chromite sulfuric acid leaching solution to 90°C, place it in a constant temperature tank with a stirring device, slowly add iron powder into the container and start stirring, and after 35 minutes of reaction, take 2 mL of the reaction solution every 3 minutes and use sulfur Potassium cyanide for Fe 3+ Detection, after 15 minutes of reaction, it was detected that there was no Fe in the reaction solution 3+ exist, stop heating and stirring;

[0056] Step 2: Filter the sample to get the filtrate, at this time Fe in the filtrate 3+ Has been completely reduced to Fe by iron powder 2+ , it...

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Abstract

The invention discloses a method for preparing basic chrome sulphate by magnochromite sulphuric acid leaching solution, which belongs to the technical field of mineral processing. The method disclosed by the invention comprises the following steps of: adjusting the temperature of the magnochromite sulphuric acid leaching solution to 40-90 DEG C and keeping the temperature constant, adding excessive iron chips or iron powder and continuously stirring, and stopping heating and stirring after Fe<3+> is not contained in the reaction solution; filtering and taking the filtrate, and recycling the remainder iron chips; adjusting the pH value of the filtrate to an interval from 1 to 4 by basic solution, slowly adding oxalic acid solids with an amount which is 1.0-1.8 times of amount of substance of a theoretical value, controlling the pH value of the solution, and always keeping the pH value in an interval of an initial level +/-0.5; after adding, continuing to stir for 5-20 minutes, filtering to obtain the residue of metal oxalates, adding the basic solution in the filtrate to neutralize, adjusting until the basicity is 33+/-1%, and drying the mother solution to obtain basic chrome sulphate. The method disclosed by the invention is capable of removing iron and magnesium in the magnochromite sulphuric acid leaching solution simultaneously in a reactor, thus reducing process flow, saving equipment space, and achieving low cost and no Cr(VI) generation.

Description

technical field [0001] The invention belongs to the technical field of mineral processing, and in particular relates to a method for preparing basic chromium sulfate from magnesium chromite ore sulfuric acid leaching solution. Background technique [0002] Chromite is a kind of ore mainly composed of chromite spinel, Cr 2 o 3 The content is usually between 18 and 62%. Iron mainly exists in the form of Fe(II), while chromium mainly exists in the form of Cr(III). The specific composition and properties of chromite from different origins and origins are slightly different, and the Fe in the tetrahedral position 2+ will be partially covered by Mg 2+ Instead, to form isomorphic spinel, with (Mg, Fe 2+ )(Cr,Fe 3+ ) 2 o 4 Expressed by the general formula, we call it magnesia chromite. Magnesia chromite is the most important mineral form in chromite and is an important raw material for the production of chromium salts. [0003] Basic chromium sulfate is also known as basic ...

Claims

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Application Information

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IPC IPC(8): C01G37/08
Inventor 刘承军赵青史培阳张波姜茂发
Owner NORTHEASTERN UNIV
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