Unlock instant, AI-driven research and patent intelligence for your innovation.

Method for preparing chromium hydroxide and chloride by detoxified chromium residue

A technology of chromium hydroxide and 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, high arsenic recovery rate, and cost reduction

Inactive Publication Date: 2011-07-06
马艳荣
View PDF3 Cites 0 Cited by
  • 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

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A method for preparing chromium hydroxide and chloride with detoxified chromium slag, comprising the following specific steps:

[0022] 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;

[0023] 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 simultaneously, ...

Embodiment 2

[0027] A method for preparing chromium hydroxide and chloride with detoxified chromium slag, comprising the following specific steps:

[0028] 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;

[0029] 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

[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 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;

[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 1:1; At this moment, chromium chloride in the solution reacts with ammoniacal liquor to generate chromium hydroxide And precipitation, generate ammonium chloride simultan...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

The invention provides a method for preparing chromium hydroxide and chloride by detoxified chromium residue. The method comprises the steps of: smashing detoxified chromium residue into fine powders from 80-100 screen meshes, mixing the fine powders with the water with 2-5 times of the weight of the fine powders into the sizing agent, mixing the sizing agent with excessive hydrochloric acid to react for 1-3h under stirring, and filtering to obtain filter liquor 1 and filter residue 1; dropwise adding ammonia water into the filter liquor 1, so that the ratio of the substance quantity of chromic chloride to that of ammonia water is 1: (1-2), and filtering to obtain a filter cake 2 and filter liquor 2; washing, drying and smashing the filter cake 2 to obtain a chromium hydroxide product; distilling the filter liquor 2 by means of pressure reduction to be saturated solution, respectively dissolving out by means of cooling and crystallizing according to the different solubility of the ammonia chloride, the calcium chloride, the magnesium chloride and the aluminum chloride, and filtering the crystalline solid to obtain the ammonia chloride, the calcium chloride, the magnesium chloride and the aluminum chloride.

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 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 environmen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): C01G37/00C01F7/56C01F5/32C01F11/28C01C1/16B09B3/00
Inventor 马艳荣
Owner 马艳荣