Sodium bichromate waste residue treatment method

A treatment method and a technology of sodium alumite, applied in chemical instruments and methods, solid waste removal, magnetic separation and other directions, can solve problems such as high economic benefits and chromium slag pollution, reduce environmental pollution, reduce ore consumption, and save storage and disposal. effect of cost

Pending Publication Date: 2021-05-11
邹玉文
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In order to solve the above technical problems, the present invention provides a method for treating waste slag of sodium red alum, which completely solves the problem of environmental pollution caused by chromium slag. The equipment used is simple, the investment is less, and it will not cause secondary pollution; it is of great significance to environmental protection. ; High economic benefit

Method used

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  • Sodium bichromate waste residue treatment method

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Effect test

Embodiment 1

[0026] A method for treating waste slag of sodium red alum. After the waste slag of sodium red alum is subjected to an N-level magnetic separation and washing step, the magnetic substances that do not adsorb hexavalent chromium are separated from the non-magnetic substances that have adsorption force to hexavalent chromium, and a hexavalent chromium-enriched solution, non-magnetic, is obtained. Magnetic slag and standard non-toxic waste slag, enriched hexavalent chromium solution can be returned to the red alum sodium production process for reuse, standard non-toxic waste slag enters the next step of comprehensive utilization, and non-magnetic slag enters the next step of harmless treatment. The mass ratio of the magnetic non-adsorbing hexavalent chromium to the non-magnetic material having hexavalent chromium adsorption is 9:1.

[0027] After the non-magnetic mixed liquid is treated by a filter press, the enriched hexavalent chromium solution is returned to the production proc...

Embodiment 2

[0030] When N=3, the waste slag enters the first magnetic separator after being evenly stirred by the non-magnetic mixed liquid produced by the first mixing tank and the second magnetic separator, and the magnetic slag enters the second mixing tank and the third magnetic separator. The non-magnetic mixed liquid produced by the separator is stirred evenly and then enters the second magnetic separator, and the non-magnetic mixed liquid in the magnetic separator is returned to the first stirring tank as waste residue washing liquid for recycling; in the second magnetic separator The magnetic slag enters the third mixing tank, and a certain amount of clear water is added at the same time, and then enters the third magnetic separator after stirring evenly, and the non-magnetic mixed liquid produced enters the second mixing tank for recycling; the first magnetic machine The medium and non-magnetic mixed liquid (containing sodium chromate solution) enters the filter press for recyclin...

Embodiment 3

[0032] In this embodiment, 5 magnetic separators are provided. Chromium slag contains 0.1% of hexavalent chromium, and the national standard for general industrial solid waste is that the hexavalent chromium content of waste slag leachate is less than 5ppm.

[0033] The red alum sodium waste residue is a calcium-free roasting method waste residue, and the magnetic separation washing method is a wet magnetic separation process, which is realized by a magnetic separator. The magnetic separator is an electromagnetic separator and / or a permanent magnet magnetic separator; wherein the magnetic force is electromagnetic and / or permanent magnet.

[0034] Specific process such as figure 1 Shown:

[0035] (1) The red alum sodium waste residue is sent into No. 1 mixing tank, mixed with the non-magnetic mixed liquid from No. 2 magnetic separator, and enters into No. 1 magnetic separator after being vigorously stirred into a slurry, and is divided into magnetic slag and non-magnetic slag...

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Abstract

The invention belongs to the technical field of sodium bichromate waste residues and particularly relates to a sodium bichromate waste residue treatment method which is characterized in that after sodium bichromate waste residues are subjected to an N-stage magnetic separation step, magnetic substances which do not adsorb hexavalent chromium are separated from non-magnetic substances which have adsorption capacity to the hexavalent chromium, an enriched hexavalent chromium solution, non-magnetic residues and non-toxic waste residues reaching the standard are obtained, the enriched hexavalent chromium solution is returned to the sodium bichromate production process for recycling, and the non-toxic waste residues and the non-magnetic residues reaching the standard enter a next step for comprehensive utilization. By using the sodium bichromate waste residue treatment disclosed by the invention, the hexavalent chromium-contained solution can be effectively returned to the sodium bichromate production process for recycling, so that the utilization rate of chromium ores is increased; used equipment is simple, the investment is less, the cost is low, and the problem of environmental pollution caused by chromium slag can be thoroughly solved; and secondary pollution cannot be caused in the treatment process, and the method has an important significance on environmental protection.

Description

technical field [0001] The invention belongs to the technical field of red alum sodium waste residue, in particular to a method for treating red alum sodium waste residue. Background technique [0002] Chromium slag, industrial waste produced during the production of metallic chromium and chromium salts. In particular, the chromium slag produced by sodium rufite is the residue after chromite ore is added to soda ash and dolomite at a high temperature of 1100-1200 ℃ and leached with water. About 1.2t of chromium slag is produced for every 1t of chromate produced. The mineral composition of chromium slag mainly includes periclase (MgO), dicalcium silicate (β-2CaO·SiO2), calcium aluminoferrite (4CaO·Al2O3·Fe2O3), calcium chromite (α-Ca(CrO2)2 ), ferric oxide, chromium spinel ((Mg Fe) (CrO2) 2), sodium chromate tetrahydrate (4Na2CrO4 4H2O), etc. [0003] Sodium red alum, also known as sodium dichromate, is an important basic chemical raw material. It is easily soluble in wate...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09B3/00B03C1/30
CPCB09B3/00B03C1/30
Inventor 邹玉文
Owner 邹玉文
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