Method for decomposing chromite by low-temperature atmospheric-pressure fluidization

A low temperature and normal pressure, chromite technology, applied in the direction of improving process efficiency, etc., can solve the problems of high pressure, large equipment investment, etc., achieve the effect of reducing alkali concentration, low reaction temperature, and promoting contact reaction

Active Publication Date: 2015-06-24
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the pressure of this method is too high and the investment in equipment is large

Method used

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  • Method for decomposing chromite by low-temperature atmospheric-pressure fluidization
  • Method for decomposing chromite by low-temperature atmospheric-pressure fluidization

Examples

Experimental program
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Effect test

Embodiment 1

[0043] A method for fluidized decomposition of chromite at low temperature and normal pressure, comprising the following steps:

[0044] 1) Prepare an aqueous solution of potassium hydroxide, potassium carbonate, and potassium metaaluminate with a certain concentration, add it to the fluidized bed reactor, and preheat it to 100°C. The contents of potassium hydroxide, potassium carbonate and potassium metaaluminate in this solution are 40%, 10% and 5% respectively. The chromite ore screened into 200 mesh or less is mixed with the solution, wherein the mass ratio of potassium hydroxide to chromite is 10:1, i.e. 7kg of chromite and 120L of potassium hydroxide mixed solution;

[0045] 2) Continue to heat the fluidized bed reactor, turn on the compressed air, and control the air flow at 10m 3 / h, maintain at 240°C for 10h, the air flow rate is not less than 12m 3 / h;

[0046] 3) Cool down and sample for dilution, dilute to the concentration of potassium hydroxide in the reaction...

Embodiment 2

[0048] 1) Configure a certain concentration of potassium hydroxide, potassium carbonate, and potassium metaaluminate aqueous solution, add it to the fluidized bed reactor, and preheat it to 100°C. The contents of potassium hydroxide, potassium carbonate, and potassium metaaluminate in the solution are 50% respectively. %, 10%, 0%. The chromite ore screened into 200 mesh or less is mixed with the solution, wherein the mass ratio of potassium hydroxide to chromite is 5:1, i.e. chromite 18kg, potassium hydroxide mixed solution 120L;

[0049] 2) Continue to heat the fluidized bed reactor, and turn on the compressed air to control the air flow at 10m 3 / h, maintain at 255°C for 8h, the air flow is not less than 12m 3 / h;

[0050] 3) Cool down and sample for dilution, dilute to the concentration of potassium hydroxide in the reaction slurry is 300g / L, filter and separate the mixed slurry at about 80°C to obtain iron-rich tailings and chromium-containing lye, wash and dry the taili...

Embodiment 3

[0052] 1) Configure a certain concentration of potassium hydroxide, potassium carbonate, and potassium metaaluminate aqueous solution, add it to the fluidized bed reactor, and preheat it to 100°C. The contents of potassium hydroxide, potassium carbonate, and potassium metaaluminate in the solution are 50% respectively. %, 10%, 5%. . The chromite ore screened into 200 mesh or less is mixed with the solution, wherein the mass ratio of potassium hydroxide to chromite is 3:1, i.e. 30kg of chromite and 120L of potassium hydroxide mixed solution;

[0053] 2) Continue to heat the fluidized bed reactor, and turn on the compressed air to control the air flow at 10m 3 / h, maintained at 285°C for 6h, the air flow is not less than 16m 3 / h;

[0054] 3) Cool down and take samples to dilute, dilute to the reaction slurry potassium hydroxide concentration of 120g / L, filter and separate the mixed slurry at about 100°C to obtain iron-rich tailings and chromium-containing lye, and wash and d...

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Abstract

The invention relates to a method for decomposing chromite by low-temperature atmospheric-pressure fluidization, which comprises the following steps: adding potassium hydroxide and an optionally added mixed water solution of potassium carbonate and / or potassium metaaluminate into a reactor, preheating, adding chromite and / or pretreated chromite, and introducing oxidizing gas to perform oxidizing reaction while heating; diluting the reaction slurry with a diluter to obtain a solution containing potassium chromate, potassium hydroxide, potassium carbonate, potassium metaaluminate and other water-soluble impurity components and an iron-rich tailing solid-liquid mixed slurry; and carrying out solid-liquid separation on the mixed slurry at 80-130 DEG C to obtain the iron-rich tailings and chromium-containing alkali liquor. The reaction temperature of the method is below the boiling point of the solution, and the process is performed under atmospheric pressure; and thus, the method has the advantages of low equipment cost, high safety and high chromium extraction yield (up to 95% above), and is easy to operate, and the operating temperature is much lower than the temperature of the traditional chromium extraction technique.

Description

technical field [0001] The invention belongs to the fields of chromite hydrometallurgy and chromium chemical industry, and in particular relates to a method for fluidized decomposition of chromite at low temperature and normal pressure. Background technique [0002] Chromium resources are important strategic resources of the country, and chromium salts are important inorganic chemical products, which can be used as important basic raw materials for chemical industry-light industry-advanced alloy materials. In industries such as leather, pigments, dyes, spices, metal surface treatment, wood preservation, and military industry, it is listed as one of the eight most competitive resource raw material products. [0003] Chromite is a mineral with spinel structure, and it is the only chromium ore that can be mined at present. It is mainly used in metallurgical industry, refractory material and chemical industry. In the metallurgical industry, chromite is the raw material for the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22B1/00C22B3/12C22B34/32
CPCY02P10/20
Inventor 杜浩刘龙杰彭中李猛李兰杰郑诗礼张懿
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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