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Method for preparing chromium hydroxide and ammonium chloride from detoxicated chromium slag
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A technology for chromium hydroxide and chromium slag is applied in the field of comprehensive utilization and treatment of chromium slag, which can solve problems such as waste of resources, and achieve the effects of simple equipment, short process flow and high arsenic recovery rate.
Active Publication Date: 2012-12-12
南通飞鲸发电设备有限公司
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Abstract
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Problems solved by technology
However, the above-mentioned comprehensive utilization method fails to make full use of the various components contained in the chromium slag, thus, it is very wasteful of resources
Method used
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Embodiment 1
[0026] A method for preparing chromium hydroxide and ammonia chloride from detoxified chromium residue, including the following specific steps:
[0027] Step A: Crush the detoxification chromium residue into a fine powder of 100 mesh, mix it with 5 times the mass of water to form a slurry, then mix and react with excess hydrochloric acid under stirring, and after reacting for 3 hours, filter to obtain filtrate one and filter residue one; It mainly contains silicon dioxide, which is processed by other processes to obtain silicon dioxide or silicate; the filtrate contains chromium chloride, magnesium chloride, aluminum chloride and calcium chloride;
[0028] Step B: Add ammonia water dropwise to the filtrate 1, and make the ratio of the amount of chromium chloride to the amount of ammonia water 1:2; at this time, the chromium chloride in the solution reacts with the ammonia water to form chromium hydroxide The precipitation generates ammonia chloride at the same time and is filtered ...
Embodiment 2
[0033] A method for preparing chromium hydroxide and chloride from detoxification chromium residue, including the following specific steps:
[0034] Step A: The detoxification chromium residue is crushed into 90 mesh fine powder, mixed with 4 times the mass of water to form a slurry, and then mixed with excess hydrochloric acid under stirring. After reacting for 2 hours, filter to obtain filtrate one and filter residue one; It mainly contains silicon dioxide, which is processed by other processes to obtain silicon dioxide or silicate; the filtrate contains chromium chloride, magnesium chloride, aluminum chloride and calcium chloride;
[0035] Step B: Add ammonia water dropwise to the filtrate 1, and make the ratio of the amount of chromium chloride to the amount of ammonia water 1:2; at this time, the chromium chloride in the solution reacts with the ammonia water to form chromium hydroxide The precipitation generates ammonia chloride at the same time and is filtered to obtain filt...
Embodiment 3
[0040] A method for preparing chromium hydroxide and chloride from detoxification chromium residue, including the following specific steps:
[0041] Step A: The detoxification chromium residue is pulverized into a fine powder of 100 mesh, mixed with 2 times the mass of water to form a slurry, and then mixed with excess hydrochloric acid under stirring. After reacting for 1 hour, filter to obtain filtrate one and filter residue one; It mainly contains silicon dioxide, which is processed by other processes to obtain silicon dioxide or silicate; the filtrate contains chromium chloride, magnesium chloride, aluminum chloride and calcium chloride;
[0042] Step B: Add ammonia water dropwise to the filtrate 1 and make the ratio of the amount of chromium chloride to the amount of ammonia water 1:1; at this time, the chromium chloride in the solution reacts with the ammonia water to form chromium hydroxide The precipitation generates ammonia chloride at the same time and is filtered to obta...
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Abstract
The invention provides a method for preparing chromium hydroxide and ammonium chloride from detoxicated chromium slag. The detoxicated chromium slag is pulverized to fine powders of 80 meshes to 100 meshes, the fine powders are mixed with 2 to 5 times (by mass) of water to produce a slurry, the slurry reacts with an excessive amount of hydrochloric acid for 1 to 3 hours while stirring, and the reaction product is filtered to produce a first filtrate and a first filter residue; ammonia water is added dropwise into the first filtrate until the ratio of amount of substance of chromium chloride to quantity of ammonia water ranges from 1 to 1 to 1 to 2, and the first filtrate is filtered to produce a second filter cake and a second filtrate; the second filter cake is washed, dried and pulverized to obtain a chromium hydroxide product; the second filtrate is mixed with an ammonium carbonate solution to have reaction, at the moment, magnesium ions and calcium ions bond with carbonate ions toproduce magnesium carbonate precipitates and calcium carbonate precipitates, and aluminum ions bond with hydroxide ions in the liquid to produce aluminum hydroxide precipitates and simultaneously release carbon dioxide gas; the reaction liquid is filtered to produce a third filter cake containing magnesium carbonate, calcium carbonate and aluminum hydroxide and a third filtrate containing ammonium chloride; and the third filtrate containing ammonium chloride is fed to a reduced pressure distillation device for reduced pressure distillation to produce a saturated solution of ammonium chloride,the saturated solution of ammonium chloride is cooled to crystallize to separate ammonium chloride out, and the ammonium chloride crystals are filtered to obtain an ammonium chloride product.
Description
Technical field [0001] The invention relates to the technical field of comprehensive utilization and treatment of chromium slag, in particular to a method for preparing chromium hydroxide and ammonia chloride by detoxifying chromium slag. Background technique [0002] Chromium slag, the industrial waste generated in the production of metallic chromium and chromium salt, currently has more than 20 provinces and cities in China discharge chromium slag. The main components of chromium slag are: silicon dioxide accounts for 4-30%, aluminum oxide accounts for 5-10%, calcium oxide accounts for 26-44%, magnesium oxide accounts for 8 to 36%, and ferric oxide accounts for 2-11% %, chromium hexaoxide (Cr2O6) accounts for 0.6 to 0.8% and sodium dichromate (Na2Cr2O7) accounts for about 1%. [0003] The chromium slag is piled in the open air and leached by rain and snow, and the hexavalent chromium contained in it is dissolved into the groundwater or into rivers and lakes, polluting the enviro...
Claims
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Application Information
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