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A kind of method and device for one-step preparation of red vitriol sodium with chromite as raw material

A technology of chromite and red vanadium sodium, applied in the direction of chromate/dichromate, etc., can solve problems such as low production efficiency, health threats, secondary pollution, etc., and achieve reduction of energy waste, reduction of environmental pollution, and simple operation Effect

Active Publication Date: 2021-08-03
KUNMING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Chromate products are usually obtained through soda ash roasting process. Due to environmental problems, the roasting process is currently under great pressure. Medium siliceous and acidic gangue minerals, but the addition of lime will produce a large amount of highly alkaline chromite processing slag, which contains 1%-2% hexavalent chromium (mass fraction), which will lead to CaCrO 4 production of CaCrO 4 It is volatile and airborne, and poses a major threat to the health of humans, animals, and plants. Moreover, this production process has serious secondary pollution, waste of resources, high energy consumption, and low production efficiency. Therefore, in order to solve the traditional process Existing defects, urgent need for new technology

Method used

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  • A kind of method and device for one-step preparation of red vitriol sodium with chromite as raw material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A kind of device that takes chromite as raw material to prepare red vitriol sodium in one step, such as figure 1 As shown, it includes mixing device 1, stirring device, horizontal reactor 7, waste liquid tank 20, oxygen tank 23, carbon dioxide gas tank 24, decomposition tank 25, separation tank 26, pumps and valves, and mixing device 1 is also equipped with There are heating resistors and thermometers, which are used for heating and temperature measurement respectively. The mixing device 1 is equipped with a stirring device, which includes a self-priming paddle 2, a motor 3, a stirring rod 4, an open worm gear stirring blade 5, and a stirring rod 4 One end passes through the top of the mixing device 1 and is connected to the motor 3. The middle part of the stirring rod 4 is provided with a self-priming paddle 2, and the bottom of the stirring rod 4 is provided with an open-type worm gear stirring blade 5. The self-priming paddle 2 stirs the feed liquid upwards. The open...

Embodiment 2

[0042] Adopting the device of embodiment 1, the upper emptying port and the lower emptying port are one, and using chromite as raw material to prepare red vitriol sodium in one step, the concrete method steps are as follows:

[0043] (1) Add chromite containing elemental Cr with a mass percentage content of 68%, soda ash with a purity of 99%, sodium hydroxide with a purity greater than 96%, and water to the mixture according to the mass ratio of 1:1.05:0.45:5 In device 1, turn on the motor 3 and the heating resistor, stir and mix evenly while heating, stop heating and stirring after the temperature measured by the thermometer reaches 100°C, and obtain the mixed liquid material;

[0044] (2) The mixed liquid material in step (1) is drawn out from the feed liquid outlet of the mixing device 1 by the booster pump 6 and enters the horizontal reactor 7 from the mixed material liquid port 8, and the horizontal reactor is obtained from the liquid level gauge 12 After the liquid level...

Embodiment 3

[0051] Adopt the device of embodiment 1, the upper emptying port and the lower emptying port are two, take chromite ore as raw material and prepare red vitriol sodium in one step, and the concrete method steps are as follows:

[0052] (1) Add chromite containing elemental Cr with a mass percentage content of 68%, soda ash with a purity of 99%, sodium hydroxide with a purity greater than 96%, and water to the mixture according to the mass ratio of 1:1.1:0.5:5 In device 1, turn on the motor 3 and the heating resistor, stir and mix evenly while heating, stop heating and stirring after the temperature measured by the thermometer reaches 100°C, and obtain the mixed liquid material;

[0053] (2) The mixed liquid material in step (1) is drawn out from the feed liquid outlet of the mixing device 1 by the booster pump 6 and enters the horizontal reactor 7 from the mixed material liquid port 8, and the horizontal reactor is obtained from the liquid level gauge 12 After the liquid level ...

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Abstract

The invention discloses a method and a device for preparing chromite sodium in one step by using chromite as a raw material, specifically comprising the following steps: mixing chromite, soda ash, sodium hydroxide, and water according to the mass ratio of 1:1~1.1:0.4~0.5:5 Mix and stir the ratio and heat to 100°C to obtain the mixed liquid material; react the mixed liquid material for 2~3h at an oxygen pressure of 3~3.5Mpa and a temperature of 200~230°C; after the reaction, replace the oxygen with carbon dioxide gas, The temperature is 1.2~1.3Mpa, the temperature is 60~70°C, the reaction is 2~3h, and the mixed product is obtained; the mixed product is separated from the supernatant, and the supernatant is obtained at a temperature of 10~15°C, and white sodium bicarbonate crystals are obtained. After the separation of sodium bicarbonate, the solution is concentrated and then cooled to obtain the sodium bicarbonate product; in the present invention, the CO obtained by decomposing sodium bicarbonate 2 and sodium carbonate reuse, to achieve CO 2 , soda ash, heat energy efficient self-recycling, reducing energy waste.

Description

technical field [0001] The invention belongs to the field of preparation of sodium bauxite, and in particular relates to a method and a device for preparing sodium bauxite in one step using chromite as a raw material. Background technique [0002] Chromite is a mineral consisting mainly of oxides of iron, magnesium and chromium. Chromite is an indispensable mineral resource for the development of metallurgy, national defense, and chemical industries. It is mainly used in the metallurgical industry to produce stainless steel and various alloy steels and alloys. It is also widely used in glass, ceramics, and refractory materials. In addition, it is also used to extract metal chromium, produce ferrochrome alloy, stainless steel, and manufacture dichromate, etc. [0003] Chromium salts are widely used in electroplating, coatings, wood preservation and other fields, among which, as the parent product of chromium salts, 70%~85% of sodium red alum is used to manufacture other chro...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/14
CPCC01G37/14
Inventor 关清卿张庚庚陈瑶何亮庙荣荣宁平
Owner KUNMING UNIV OF SCI & TECH
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