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Method for preparing high-chromium product by combining micro waves and ultrasonic waves to leach chromite through hydrochloric acid

A hydrochloric acid leaching and chromite technology, applied in the direction of improving process efficiency, can solve the problems of many reagents, complicated process, long process, etc., and achieve the effect of low cost, short process and low reduction temperature

Inactive Publication Date: 2018-12-18
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It can be seen from the above method that the process of preparing metallic chromium is complicated, the flow process is long, and more reagents are added.

Method used

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  • Method for preparing high-chromium product by combining micro waves and ultrasonic waves to leach chromite through hydrochloric acid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Such as figure 1 Shown, this microwave-ultrasonic combination uses hydrochloric acid leaching chromite to prepare the method for high chromium product, and its concrete steps are as follows:

[0029] Step 1, crushing the chromite ore until the particle size is below 200 mesh to obtain chromite ore powder; the chromite ore includes the following mass percentage components: Cr 2 o 3 40.82%, SiO 2 5.02%, Al 2 o 3 13.04%, CaO2.4%, MgO10.83%, TFe19.85%, Cr 2 o 3 / FeO1.69;

[0030] Step 2. Add the chromite powder obtained in step 1 into a hydrochloric acid solution with a concentration of 11.6mol / L according to the liquid-solid ratio of 2:0.5mL / g, heat up to 600°C under the condition of microwave power of 1500g / W, and The power is 100W, the ultrasonic frequency is 20KHz, and the insulation is leached for 60 minutes. After the leaching is completed, filter and dry to obtain the leaching residue;

[0031] Step 3. Powder the leaching slag obtained in step 2 until the par...

Embodiment 2

[0034] Such as figure 1Shown, this microwave-ultrasonic combination uses hydrochloric acid leaching chromite to prepare the method for high chromium product, and its concrete steps are as follows:

[0035] Step 1, crushing the chromite ore until the particle size is below 200 mesh to obtain chromite ore powder; the chromite ore includes the following mass percentage components: Cr 2 o 3 40.82%, SiO 2 5.02%, Al 2 o 3 13.04%, CaO2.4%, MgO10.83%, TFe19.85%, Cr 2 o 3 / FeO1.69;

[0036] Step 2. Add the chromite powder obtained in step 1 into a hydrochloric acid solution with a concentration of 12.4mol / L according to the liquid-solid ratio of 3:1mL / g, and heat up to 400°C under the condition of microwave power of 1000g / W. Heat preservation and leaching for 20 minutes under the conditions of 180W and ultrasonic frequency of 28KHz. After the leaching is completed, filter and dry to obtain the leaching residue;

[0037] Step 3. Powder the leach slag obtained in step 2 until the...

Embodiment 3

[0040] Such as figure 1 Shown, this microwave-ultrasonic combination uses hydrochloric acid leaching chromite to prepare the method for high chromium product, and its concrete steps are as follows:

[0041] Step 1, crushing the chromite ore until the particle size is below 200 mesh to obtain chromite ore powder; the chromite ore includes the following mass percentage components: Cr 2 o 3 40.82%, SiO 2 5.02%, Al 2 o 3 13.04%, CaO2.4%, MgO10.83%, TFe19.85%, Cr 2 o 3 / FeO1.69;

[0042] Step 2. Add the chromite powder obtained in step 1 into a hydrochloric acid solution with a concentration of 12.0mol / L according to a liquid-solid ratio of 3:1mL / g, and heat up to 500°C under the condition of a microwave power of 1300g / W. Heat preservation and leaching for 40 minutes under the conditions of 120W and ultrasonic frequency of 24KHz. After the leaching is completed, filter and dry to obtain the leaching residue;

[0043] Step 3. Powder the leaching slag obtained in step 2 until...

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Abstract

The invention relates to a method for preparing a high-chromium product by combining micro waves and ultrasonic waves to leach chromite through hydrochloric acid, and belongs to the technical field ofmicrowave smelting and chromite. The method comprises the following steps of: crushing chromite into chromite powder with a grain size smaller than 200 meshes; adding the obtained chromite powder into a hydrochloric acid solution with concentration of 11.6-12.4 mol / L in a liquid-solid ratio of (2-3) to (0.5-1)mL / g, heating to 400-600 DEG C under a condition with microwave power of 1000-1500g / W, preserving heat and leaching for 20-60 minutes under conditions with ultrasonic power of 100-180W and ultrasonic frequency of 20-28 KHz, and filtering and drying to obtain leached residues after leaching is completed; crushing the obtained leached residues until the grain size is smaller than 200 meshes, adding a ferro-silicon alloy reducing agent, mass of which accounts for 75-100% of that of theleached residues, to uniformly mix, and performing constant-temperature microwave roasting for 10-40 minutes at a temperature of 1100-1450 DEG C under microwave power of 1000-1500g / W, thereby obtaining the high-chromium product. The method is simple in process, is short in process, is strong in operability and is relatively low in cost.

Description

technical field [0001] The invention relates to a method for preparing high-chromium products by leaching chromite ore with hydrochloric acid combined with microwave and ultrasonic wave, and belongs to the technical field of microwave metallurgy and chromite ore. Background technique [0002] There is no pure chromium in nature, and more than 50 kinds of chromium-containing minerals have been discovered so far, but most of them contain low chromium, scattered distribution, and low industrial utilization value. Chromite, a natural aggregate of chromium spinel-like minerals, is the only industrial source of chromium in the world economy. The main components of chromite are oxides of iron, magnesium and chromium, and the general formula can be expressed as (FeO·Cr 2 o 3 ). [0003] Metal chromium is a brittle metal and cannot be used as a metal material alone, but it can be smelted into alloys with iron, cobalt, nickel, tungsten, titanium, aluminum, copper and other metals. ...

Claims

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Application Information

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IPC IPC(8): C22B34/32C22B3/10C22B5/04
CPCC22B3/10C22B5/04C22B34/32Y02P10/20
Inventor 代林晴胡婷刘花刘秉国张利波郭胜惠彭金辉
Owner KUNMING UNIV OF SCI & TECH
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