Method for producing chromate by liquid-phase catalytic oxidation of chromite
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A liquid-phase catalysis and chromate technology, applied in the direction of chromate/dichromate, etc., can solve the problems of long reaction time and disadvantages
Inactive Publication Date: 2015-04-15
HUBEI ZHENHUA CHEMICAL CO LTD +1
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The above-mentioned patents have different reaction times depending on the oxidant added. When the oxidant is the most commonly used oxygen
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Embodiment 1
[0020] Chromite ore 250g, chromite ore particle size less than 50μm (-300 mesh), alkali ore ratio 4:1, alkali concentration 60%, manganese hydroxide 125g, lye, chromite and manganese hydroxide are prepared as raw material Slurry was added to the reaction kettle, oxygen was used as an oxidant, the total pressure was controlled to 3.2MPa, the stirring speed was 650 rpm, the temperature was 260°C, the reaction was 120min, and the chromite leaching rate was 90.37%.
Embodiment 2
[0024] 250g of chromite, the particle size of chromite is less than 28μm (500 mesh), the alkali ore ratio is 4:1, the alkali concentration is 60%, manganese hydroxide 12g, the lye, chromite and manganese hydroxide are prepared into slurry , into the reactor, oxygen as an oxidant, control the total pressure of 3.2MPa, stirring speed of 650 rpm, temperature of 260 ° C, reaction 120min, chromite leaching rate of 57.64%.
Embodiment 3
[0028] 250g of chromite, the particle size of chromite is less than 50μm (-300 mesh), the ratio of alkali to mineral is 4:1, the concentration of alkali is 60%, copper oxide is 15g, and lye, chromite and copper oxide are prepared into slurry, Adding oxygen into the reaction kettle, using oxygen as an oxidant, controlling the total pressure to 3.2MPa, stirring speed to 650 rpm, temperature to 260°C, and reacting for 120 minutes, the leaching rate of chromite was 82.53%.
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Abstract
The invention discloses a method for cleanly producing chromate by liquid-phase catalytic oxidation of chromite. The method includes following steps: (1) preparing a slurry material from the chromite, an alkaline solution and a catalyst; (2) performing an oxidizing reaction to the slurry material prepared in the step (1) with an oxidizing agent to obtain a reaction product; (3) diluting the reaction product, performing liquid-solid separation to respectively obtain an alkaline solution and a mixture composed of a crystal of chromate (such as sodium chromate or potassium chromate) and a residue; and (4) dissolving and filtering the mixture and removing impurities from the mixture to obtain a chromate solution, and further performing evaporative crystallization to the chromate solution to obtain the chromate product. The method can effectively increase the efficiency of producing the chromate (such as sodium chromate or potassium chromate) by liquid-phase catalytic oxidation of the chromite. In the method, the catalyst does not enter the liquid phase after the reaction finished so that the catalyst can be separated from the chromate (such as sodium chromate or potassium chromate) product. The catalyst is free of polluting the product so that the method has an excellent industrial application prospect.
Description
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