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Method for preparing chromium hydroxide and ammonium chloride from detoxicated chromium slag

A technology of chromium hydroxide and ammonium chloride, which is applied in the field of comprehensive utilization and treatment of chromium slag, can solve problems such as waste of resources, and achieve the effects of simple equipment, cost reduction, and high arsenic recovery rate

Active Publication Date: 2011-07-06
南通飞鲸发电设备有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for preparing chromium hydroxide and ammonium chloride with detoxified chromium slag, comprising the following specific steps:

[0027] Step A: crush the detoxified chromium residue into 100-mesh fine powder, mix it with 5 times the mass of water to form a slurry, then mix it with excess hydrochloric acid under stirring, and filter it after reacting for 3 hours to obtain filtrate 1 and filter residue 1; 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 ammoniacal liquor dropwise in filtrate one, and make the ratio of the amount of substance of chromium chloride and the amount of substance of ammoniacal liquor be 1: 2; At this moment, chromium chloride in the solution reacts with ammoniacal liquor to generate chromium hydroxide And precipitation, generate ammonium chloride simulta...

Embodiment 2

[0033] A method for preparing chromium hydroxide and chloride with detoxified chromium slag, comprising the following specific steps:

[0034] Step A: crush the detoxified chromium residue into 90-mesh fine powder, mix it with 4 times the mass of water to form a slurry, then mix and react with excess hydrochloric acid under stirring, and filter after reacting for 2 hours to obtain filtrate 1 and filter residue 1; 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 ammoniacal liquor dropwise in filtrate one, and make the ratio of the amount of substance of chromium chloride and the amount of substance of ammoniacal liquor be 1: 2; At this moment, chromium chloride in the solution reacts with ammoniacal liquor to generate chromium hydroxide And precipitation, generate ammonium chloride simultaneousl...

Embodiment 3

[0040] A method for preparing chromium hydroxide and chloride with detoxified chromium slag, comprising the following specific steps:

[0041] Step A: crush the detoxified chromium residue into 100-mesh fine powder, mix it with 2 times the mass of water to form a slurry, then mix it with excess hydrochloric acid for reaction under stirring, and filter after reacting for 1 hour to obtain filtrate 1 and filter residue 1; 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 ammoniacal liquor dropwise in filtrate one, and make the ratio of the amount of substance of chromium chloride and the amount of substance of ammoniacal liquor be 1:1; At this moment, chromium chloride in the solution reacts with ammoniacal liquor to generate chromium hydroxide And precipitation, generate ammonium chloride simultan...

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PUM

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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 ammonium chloride from detoxified chromium slag. Background technique [0002] Chromium slag is the industrial waste produced during the production of metal chromium and chromium salts. Currently, 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 8-36%, and ferric oxide accounts for 2-11%. %, chromium hexaoxide (Cr2O6) accounts for 0.6-0.8% and sodium dichromate (Na2Cr2O7) accounts for about 1%. [0003] Chromium slag is piled up in the open air, soaked by rain and snow, and the contained hexavalent chromium is dissolved and infiltrated into groundwater or into rivers and lakes, polluting the e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00C01C1/16B09B3/00
Inventor 马艳荣
Owner 南通飞鲸发电设备有限公司
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