A method for preparing basic chromium sulfate tanning agent from chromite ore sulfuric acid leaching solution

A chrome sulfate tanning agent and leaching solution technology, which can be used in small raw hides/large raw hides/leather/fur treatment, small raw hides/large raw hides/leather hides/fur chemical treatment, tanning treatment, etc. problem, to achieve the effect of complete iron removal, strong continuity, and mild method conditions

Active Publication Date: 2016-11-23
NORTHEASTERN UNIV LIAONING
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  • Description
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Problems solved by technology

[0004] Aiming at the problem that the existing chromite sulfuric acid leaching solution is difficult to remove iron, the present invention provides a method for preparing basic chromium sulfate tanning agent from the chromite sulfuric acid leaching solution. Iron removal, so that Fe in solution 3+ The concentration drops below 1g / L, and then deep iron removal of goethite is carried out, which realizes the effective separation of chromium and iron in the acidic system solution, and prepares high-quality basic chromium sulfate tanning agent products

Method used

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  • A method for preparing basic chromium sulfate tanning agent from chromite ore sulfuric acid leaching solution
  • A method for preparing basic chromium sulfate tanning agent from chromite ore sulfuric acid leaching solution
  • A method for preparing basic chromium sulfate tanning agent from chromite ore sulfuric acid leaching solution

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preparation example Construction

[0050] The following preparation method of chromite sulfuric acid leaching solution is: grinding the chromite ore into particles, adding it to the reactor, and then adding sulfuric acid. The liquid-to-solid ratio of sulfuric acid to mineral powder is (1~4): 1mL / g, at the stirring speed The temperature is 60~160 rpm, the temperature is 90~160℃, the catalyst is added to carry out the acidolysis reaction, the reaction temperature is 110~170℃, the reaction time is 1~8h, the reaction solution is filtered and the filter residue is removed to obtain chromium Iron ore sulfuric acid leaching solution.

[0051] The used pyrite seed crystals and goethite seed crystals have a mass purity of >97% and a powder particle size of <74μm.

Embodiment 1

[0053] Using 500mL chromite sulfuric acid leaching solution as raw material, the concentration of metal ions in the leaching solution is [Cr 3+ ]=26.4g / L, [Fe 3+ ]=13.2g / L, [Mg 2+ ]=3.7g / L, [Al 3+ ]=4.5g / L.

[0054] Use as figure 1 As shown in the schematic diagram of the process flow of preparing basic chrome sulfate tanning agent from chromite sulfuric acid leaching solution, the method for preparing basic chrome sulfate tanning agent from chromite sulfuric acid leaching solution in this embodiment, the specific steps are as follows:

[0055] Step 1: Pour the chromite sulfuric acid leaching solution into the reactor, turn on the heating and stirring, the stirring speed is 2400rad / s (radian per second), raise the temperature of the leaching solution to 90℃, and slowly drop 2.5mol / L into the reactor Potassium hydroxide solution until the pH value of the solution reaches 2.3, and keep it unchanged for at least 1 min;

[0056] Then pour 2.5g jarosite seed crystal powder into the reacto...

Embodiment 2

[0066] Using 500mL chromite sulfuric acid leaching solution as raw material, the concentration of metal ions in the leaching solution is [Cr 3+ ]=30.7g / L, [Fe 3+ ] = 19.8g / L, [Mg 2+ ]=5.2g / L, [Al 3+ ]=6.6g / L.

[0067] In this embodiment, the method for preparing basic sulfate chrome tanning agent from chromite sulfuric acid leaching solution, the specific steps are as follows:

[0068] Step 1: Inject the chromite sulfuric acid leaching solution into the reactor, turn on the heating and stirring, the stirring speed is 1800rad / s, and the temperature of the leaching solution is raised to 85℃, and slowly drop 3mol / L sodium hydroxide solution into the reactor to reach the solution The pH value reaches 1.7 and remains unchanged for at least 1 min;

[0069] Pour 1g of yellow sodium iron vitriol seed crystal powder into the reactor, keep the stirring speed at 1800rad / s for aging reaction for 150 minutes, and monitor the pH value of the solution to stabilize in the range of 1.6 to 1.8 by addi...

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Abstract

The invention provides a method of preparing a basic chromium sulfate tanning agent from chromite sulfuric acid leachate, belongs to the technical field of ore processing, and aims to solve the problem that iron cannot be removed from chromite sulfuric acid leachate easily in the prior art. In the provided method, the temperature of chromite sulfuric acid leachate is controlled in a range of 60 to 100 DEG C, the pH value is controlled in a range of 1 to 3, then a pyrite crystal seed is added to carry out crystallization; then the crystals are filtered to obtain pyrite crystals and a filtrate; the temperature of the filtrate is maintained, the pH of the filtrate is adjusted to a range of 2 to 4, then adding a goethite crystal seed to carry out crystallization; the crystals are filtered to obtain goethite crystals and a filtrate; a diluted alkali solution is added into the filtrate to neutralize the filtrate, after neutralization, the basicity of the solution is in a range of 32 to 34%; and then the solution is dried to obtain the basic chromium sulfate tanning agent. During the preparation process, no virulent Cr(VI) is generated; the method is clean and nontoxic therefore, moreover, the iron is removed in two steps, thus the iron is almost removed, and the iron content of the obtained basic chromium sulfate tanning agent in mass percentage is less than 0.1%.

Description

Technical field [0001] The invention belongs to the technical field of mineral processing, and particularly relates to a method for preparing a basic sulfate chrome tanning agent from a chromite sulfuric acid leaching solution. Background technique [0002] Chromite is the main occurrence form of chromium in nature. Among them, iron, magnesium, aluminum and chromium co-exist in chromite in the form of isomorphic spinel, available (Mg, Fe 2+ )(Cr,Al,Fe 3+ ) 2 O 4 The general formula is expressed. Due to different mineralization conditions, some chromites do not contain magnesium, and some chromites do not contain aluminum. Chromite is widely used in the chemical industry and other fields and is an important raw material for the production of chromium salts. my country began to produce chromium salts in 1958, and in 2005 it surpassed the United States for the first time to become the world's largest country in chromium salt production. Up to now, nearly half of the world's chromi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C14C3/06
CPCC14C3/06
Inventor 刘承军赵青张庆松史培阳姜茂发
Owner NORTHEASTERN UNIV LIAONING
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