Clean environment-friendly production technique of chromic oxide

A chromium trioxide, clean and environmentally friendly technology, applied in the direction of chromium trioxide, chromium oxide/hydrate, etc., can solve problems such as difficult industrialization, low efficiency, and environmental pollution, and achieve easy industrial scale production, improved production efficiency, and economical benefit-enhancing effect

Inactive Publication Date: 2012-08-22
HUNAN LIANZHI METALLURGY NEW MATERIAL
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Problems solved by technology

[0003] But the existing above-mentioned production technology of metal chromium and chromium salt mainly has the following technical problems: as adopting hexavalent chromium conversion method, it is to be main raw material with chromite, by adding the fine powder mixing of lime or dolomite and soda ash etc. Roasted at high temperature in the rotary kiln, the sodium chromate contained in it is leached as a raw material, and dichromium trioxide, metal chromium and chromium salt are produced through the transformation of sodium chromate, and a large amount of hexavalent Chromium waste residue, every ton of sodium chromate produced will produce more than 6 tons of waste residue, of which highly toxic hexavalent chromium ions and calcium chromate seriously pollute the environment and affect human health
Although this method does not produce toxic hexavalent chromium ions, it is either inefficient, or the separation of impurities is not complete and it is difficult to industrialize

Method used

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  • Clean environment-friendly production technique of chromic oxide
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Embodiment 1

[0012] Embodiment 1, refer to figure 1 , the present invention adopts the principle of high-temperature oxidation-reduction reaction, the thermodynamics and kinetics principle of solid-solid reaction, uses carbon ferrochrome powder as the main raw material, and metal oxide powder as the auxiliary raw material, passes through 500 The high-temperature solid-solid phase metallurgy method at ℃~1500℃ converts the chromium in ferrochromium carbon into dichromium trioxide, and the conversion rate of chromium is 15~95%. After cooling and preparing powder, the water separation method is used Or acid separation to separate chromium trioxide. The weight ratio of the carbon ferrochrome to the metal oxide is 1:0.3-1.2, and the particle size of the carbon ferrochrome and metal oxide powder should be between 1.0 mm and 500 mesh. The chromium content of the carbon ferrochrome is 30-80%, and the quality should meet GB5683-87; the oxide purity of the metal oxide powder is ≥ 60%, preferably usi...

Embodiment 2

[0017] Embodiment 2, the present invention can also add catalyst in the mixed powder of carbon ferrochrome powder and metal oxide, and described catalyst comprises potassium ion type, sodium ion type catalyst, carbon ferrochrome and metal oxide mixed powder The weight ratio of the catalyst to the catalyst is 1:0.005-0.02, and the particle size of the catalyst powder is 80-500 meshes; compaction, drying, and high-temperature metallurgy convert the chromium in the carbon ferrochromium into dichromium trioxide, and prepare it by cooling. After powdering, chromium trioxide is separated by water separation method or acid separation method. Described potassium ion catalyst comprises potassium chloride KCl, potassium fluoride KF, potassium iodide KI or potassium carbonate K 2 CO 3 , sodium ion catalysts include sodium chloride NaCl, sodium fluoride NaF, sodium iodide NaI or sodium carbonate Na 2 CO 3 . refer to figure 1 , all the other are with embodiment 1.

Embodiment 3

[0018] Embodiment 3, the weight ratio of the carbon ferrochrome of the present invention to the metal oxide is 1:0.3-0.5, and the chromium separation rate can reach 15-33%. refer to figure 1 , all the other are with embodiment 1 or 2.

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Abstract

The invention relates to a clean environment-friendly production technique of chromic oxide. The invention mainly solves the technical problem that the existing production technique has a great impact on the environment, can not implement industrial production due to the immature production technique, or the like. The technical scheme is as follows: the technique comprises the following steps: mixing the main raw material carbon ferrochrome powder and the auxiliary material metal oxide powder, compacting, drying, carrying out a solid-solid metallurgical process at 500-1500 DEG C to convert chrome in the carbon ferrochrome into chromic oxide, cooling to obtain powder, and separating to obtain the chromic oxide. The invention solves the problem of environment pollution due to sexavalent chrome and calcium chromate in the prior art; and the production technique is simple, has obvious social benefit, can easily implement industrial large-scale production, greatly enhances the production efficiency, and obviously enhances the economic benefit.

Description

technical field [0001] The invention relates to a production process of metal chromium and chromium salt, in particular to a production process of chromium trioxide. Background technique [0002] At present, the process of producing sodium chromate from chromite is the same in the front process of the joint production process of metal chromium and chromium salt, but the latter process is different. The post-process of the metal chromium system is mainly trivalent chromium, while the chromium salt system is all hexavalent chromium. If Cr is brought into the chromium salt system in the process, it will bring great difficulties to the production. The crystal color is deep, and the Glauber's salt is fine, black and sticky, which cannot be washed and dried. What's more, it will make it difficult to carry out normal production. Another example is "Research on the New Process of Producing Metal Chromium (Chromium Salt) with Ferrochrome" published in "Ferroalloy" (page 35-38, Issue...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/033
Inventor 刘巍
Owner HUNAN LIANZHI METALLURGY NEW MATERIAL
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