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Preparation method of high-purity chromic oxide

A chromium trioxide, high-purity technology, applied in chromium oxide/hydrate and other directions, can solve the problems of harsh equipment requirements, high cost, and unsatisfactory preparation purity.

Pending Publication Date: 2020-01-07
宁夏中科欧德科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Aiming at the problems that the existing chromium trioxide preparation process has strict equipment requirements, resulting in high cost and preparation purity that cannot meet the market demand of 99.995%, the present invention provides a simple process flow, simple equipment requirements, and low preparation cost. The preparation method of high-purity chromium trioxide with a purity of 99.995% meets market demand at the same time

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step one: be 50% sulfuric acid and 13.1g mass fraction by 315.56g mass fraction be the H of 5% 2 o 2 Stir and heat to 90°C, keep the temperature at 90°C±2°C, slowly adjust the stirring rate to 1200r / min, take 100g of high-purity chromium powder, add high-purity chromium powder in several times, and the high-purity chromium powder will be added in 20 minutes After the addition is complete, keep the heating temperature at 90°C±2°C and the stirring rate at 1200r / min to speed up the reaction, so that all the sulfuric acid participates in the reaction during the reaction, and the pH after the reaction is 1-2, and the entire reaction process takes 1 hour. Its reaction formula is as follows:

[0038] 3H 2 SO 4 +2Cr→Cr 2 (SO 4 ) 3 +3H 2 ↑

[0039]Step 2: Cool the reaction solution in step 1 to normal temperature, then suction filter the reaction solution, transfer the filtrate to another reactor, recycle the filter residue, and recover 4.3 g of the filter residue.

[0...

Embodiment 2

[0050] Step 1: 504.9g mass fraction is 40% sulfuric acid and 26.2g mass fraction is 5% H 2 o 2 Stir and heat to 90°C, keep the temperature at 90°C±2°C, take 200g of high-purity chromium powder at a stirring rate of 1200r / min, add high-purity chromium powder in several times, and the high-purity chromium powder will be added within 25 minutes After the addition is complete, keep the heating temperature at 90°C±2°C and the stirring rate at 12000r / min to speed up the reaction, so that all the sulfuric acid participates in the reaction during the reaction, and the pH after the reaction is 1-2. The entire reaction process takes 4 hours. Its reaction formula is as follows:

[0051] 3H 2 SO 4 +2Cr→Cr 2 (SO 4 ) 3 +3H 2 ↑

[0052] Step 2: Cool the reaction solution in step 1 to normal temperature, then suction filter the reaction solution, transfer the filtrate to another reactor, filter the residue, and recover 10.2 g of the filter residue.

[0053] Step 3: Stir and heat the ...

Embodiment 3

[0063] Step 1: 378.67g mass fraction is 60% sulfuric acid and 13.1g mass fraction is 5% H 2 o 2 Stir and heat to 90°C, keep the temperature at 90°C±2°C, take 100g of high-purity chromium powder at a stirring rate of 800r / min, add high-purity chromium powder in several times, and the high-purity chromium powder will be added within 40 minutes After the addition is complete, keep the heating temperature at 90°C±2°C and the stirring rate at 800r / min to speed up the reaction, so that all the sulfuric acid participates in the reaction during the reaction, and the pH after the reaction is 1 to 2. The whole process takes 2 hours. The formula is as follows:

[0064] 3H 2 SO 4 +2Cr→Cr 2 (SO 4 ) 3 +3H 2 ↑

[0065] Step 2: Cool the reaction solution in step 1 to normal temperature, then suction filter the reaction solution, transfer the filtrate to another reactor, recycle the filter residue, and recover 5.1 g of the filter residue.

[0066] Step 3: Stir and heat the filtrate tr...

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Abstract

The invention discloses a preparation method of high-purity chromic oxide, and relates to the technical field of high-purity oxide preparation. The preparation method comprises the following steps: reacting high-purity chromium particles with sulfuric acid under the action of hydrogen peroxide, carrying out suction filtration on the obtained reaction solution after the reaction is finished to obtain a chromium sulfate solution, stirring and heating the chromium sulfate solution, dropwise adding an ammonium bicarbonate solution, adding a cationic polyacrylamide flocculant when the pH value reaches 3.5-4.5, dropwise adding the ammonium bicarbonate solution until the pH value of the reaction solution reaches 7-8, aging the obtained reaction solution, carrying out suction filtration on the reaction solution after aging, drying the obtained green precipitate, grinding and screening the dried precipitate, and calcining the ground and screened dried precipitate to obtain the high-purity chromic oxide. The high-purity oxide is directly generated from the metal elementary substance through a chemical process, so the problems of waste of raw materials and reagents and difficulty in subsequent suction filtration of chromium carbonate colloid, caused by direct reaction of the metal elementary substance and the sulfuric acid, are solved.

Description

technical field [0001] The invention relates to the technical field of high-purity oxide preparation, in particular to a preparation method of high-purity chromium trioxide. Background technique [0002] Chromium trioxide has the characteristics of heat resistance, light resistance and chemical corrosion resistance, and is an important inorganic pigment. Ultrafine chromium trioxide has the characteristics of magnetism and high hardness, and can be used as an abrasive for magnetic materials or magnetic recording materials. As a commonly used fast-burning catalyst in composite solid propellants, the smaller the particle size of chromium trioxide, the higher its catalytic efficiency. It is mainly used as a colorant for enamel, ceramics, artificial leather, and building materials, and as a catalyst for organic chemical synthesis. , light-resistant coatings, abrasive materials, green polishing pastes and special inks for printing banknotes. It is also used in the production of ...

Claims

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Application Information

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IPC IPC(8): C01G37/02
CPCC01G37/02C01P2006/80
Inventor 赵久祥汪勇
Owner 宁夏中科欧德科技有限公司
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