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Rapid and accurate determination method of chromium and chromium extracting and manufacturing product process
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A determination method and precise technology, applied in the fields of fine chemical analysis, metallurgy and chemical manufacturing, which can solve the problems of long time required, inaccurate chromium results and high cost
Inactive Publication Date: 2019-07-09
唐翔
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Problems solved by technology
Although some chromium detection methods have added other metal exclusion agents in advance, the impurities removed are too limited, resulting in a much higher chromium detection result, and judging from the existing chromium detection methods, the detection process is complicated and requires It takes a long time, high cost, and low accuracy. The most critical outstanding problem is that the actual value of chromium detected is too high
A domestic company has invented a detection method for trace elements in hexavalent chromium chromate, patent number: 201310342781.8 Publication date: 2013.11.20 It simply considers the removal of lead and barium metals, but in the production process of hexavalent chromium salt Among them, chromic acid can directly remove lead, barium, and strontiumheavy metals in the solution, but there is no way to remove other metals, which still leads to inaccurate results of chromium detection and has no practical application value.
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Embodiment 1
[0036] Taking 99.8% of the metal chromium produced by a domestic enterprise by molten electrolysis, the index value is:
[0038] 1. Weigh 50g of chromium sample and put it into a beaker, weigh 130g of sulfuric acid, place the beaker on the electric furnace, add 30g of water, add sulfuric acid dropwise while heating to completely dissolve the chromium. Filter to remove impurities to obtain a filtrate.
[0039] 2. Add alkali, oxidant, yellow blood salt, red blood salt, and nitrosophenylhydroxylamine to the filtrate, stir to complete the reaction, filter and wash for many times, so that there is no chromium ion solution in the filter residue, dry the filter residue, and weigh 42.8g , to produce high-purity Cr 3+ filtrate.
[0040] 3. Cr 3+ Add ammonia water to the filtrate to make Cr in the solution 3+Completely precipitate as chromium hydroxide, filter, wash, completely remove the impurity ...
example 2
[0042] Take the high-purity chromium Cr99.5% produced by the electrolysis of chromium ammoniumalum in a domestic enterprise.
[0043] 1. Weigh 50g of metal chromium and 130g of sulfuric acid, put the chromium powder into a 500ml beaker, place it on the electric furnace, add 30ml of water, add acid while heating, completely dissolve the chromium powder, filter, remove impurities, and obtain Cr 3+ solution.
[0044] 2. Add gamma-hydroxyquinoline and nitrosophenylhydroxylamine to the filtrate, stir for reaction, filter, remove the filter residue, and wash repeatedly so that the filter residue does not contain Cr 3+ solution to produce high-purity Cr 3+ Solution 350ml.
[0045] 3. Take high-purity Cr 3+ Solution 50ml, add ammoniumpersulfate to make the Cr in the solution 3+ fully oxidized to Cr 6+ .
[0046] 4. Titrate the solution Cr with diphenylcarbazide 6+ , and then using atomic colorimetric analysis, 50ml of chromium is converted to 6.1g. Step 3 produces Cr 3+ The...
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Abstract
The invention relates to a rapid and accurate determination method of chromium and a chromium extracting and manufacturing product process. Chromium-containing substances such as metalchromium, chromium alloy, chromite and chromium compounds are dissolved by adding acid, impurities in the chromium solution are removed by adding special substances to prepare a high-purity chromium solution, and then the chromium solution is subjected to chemical method and instrument analysis to quickly determine the content of chromium and extract chromium to prepare chromium products. According to the rapidand accurate determination method, metal chromium ions are firstly purified, the influence of other metal ions on chromium is fully eliminated to enable the determination of chromium to be very fast and accurate, and the extracted chromium has high purity, so that the high-quality chromium series high-end products are prepared, and the rapid and accurate determination method is widely applied to different fields of the requirements of chromium series products.
Description
technical field [0001] The invention relates to a rapid and accurate determination and extraction process of chromium, which belongs to the fields of fine chemical analysis, metallurgy and chemical manufacturing. Background technique [0002] Chromium plays an important role in the development of national economy. Widely used in aerospace, high-end weapons, electronic information technology, biomedicine, beauty products, food, health products, electroplating, leather, ceramics, pigments and other fields. [0003] Chromium was discovered in 1797 by the French chemist Vauqueland analyzing chromium lead ore. He used chromium lead ore to produce chromic acid and reduced it with carbon in a graphitecrucible to obtain light gray metallic chromium. The production of metal chromium mainly uses dichromium trioxide as raw material at home and abroad, and is produced by thermite method, carbon reduction method, and molten electrolysis method. There are very few enterprises that use s...
Claims
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