Method of preparing basic chromium sulfate tanning agent from chromite sulfuric acid leachate

A technology of chromium sulfate tanning agent and leachate, which can be used in small hide/big hide/leather/fur treatment, small hide/big hide/leather/fur chemical treatment, tanning treatment, etc. It can solve iron removal difficulties, etc. problem, to achieve the effect of complete iron removal, good use effect and strong continuity

Active Publication Date: 2015-07-15
NORTHEASTERN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • Method of preparing basic chromium sulfate tanning agent from chromite sulfuric acid leachate
  • Method of preparing basic chromium sulfate tanning agent from chromite sulfuric acid leachate
  • Method of preparing basic chromium sulfate tanning agent from chromite sulfuric acid leachate

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preparation example Construction

[0050] The following preparation method of sulfuric acid leaching solution of chromite ore is as follows: grind chromite ore into particles, add sulfuric acid into the reactor, and then add sulfuric acid. The liquid-solid ratio of sulfuric acid and mineral powder is (1-4): 1mL / g, 60-160 rev / min, heat up, at a temperature of 90-160°C, add a catalyst for acidolysis reaction, the reaction temperature is 110-170°C, the reaction time is 1-8h, filter the reaction solution, remove the filter residue, and obtain chromium iron ore sulfuric acid leaching solution.

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

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 The schematic diagram of the process of preparing basic chromium sulfate tanning agent by chromite sulfuric acid leaching solution shown, the present embodiment prepares the method for basic chromium sulfate tanning agent by chromite sulfuric acid leaching solution, and concrete steps are as follows:

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

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

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] The present embodiment prepares the method for basic chromium sulfate tanning agent by chromite ore sulfuric acid leaching liquor, concrete steps are as follows:

[0068] Step 1: Inject the chromite sulfuric acid leaching solution into the reactor, turn on heating and stirring at a stirring speed of 1800rad / s, raise the temperature of the leaching solution to 85°C, and slowly add 3mol / L sodium hydroxide solution dropwise into the reactor to the solution The pH value reaches 1.7 and remains unchanged for at least 1 minute;

[0069] Pour 1g of jarosite seed crystal powder into the reactor, keep the stirring speed at 1800rad / s for aging reaction for 150min, and monitor the pH value of the solution by dropping the above-mentioned sodium hydroxide solution in the ra...

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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, in particular to a method for preparing basic chromium sulfate tanning agent from chromite ore sulfuric acid leaching solution. Background technique [0002] Chromite is the main form of chromium in nature, in which iron, magnesium, aluminum and chromium coexist in chromite in the form of isomorphic spinel, which can be used (Mg, Fe 2+ )(Cr,Al,Fe 3+ ) 2 o 4 expression in the general formula. Due to different ore-forming conditions, some chromites do not contain magnesium, and some chromites do not contain aluminum. Chromite is widely used in 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 surpassed the United States for the first time in 2005 to become the world's largest producer of chromium salts. Up to now, nearly half of the world's chromium salts are produced in...

Claims

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Application Information

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Patent Type & Authority Applications(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
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