Process for preparing basic chromium sulfate by using waste chromium material

A technology of chromium sulfate and chromium material, applied in the field of inorganic salt recovery process and heavy metal treatment, can solve the problems of high treatment and production cost, complicated process, slow effect, etc., achieve low production cost, solve waste chromium pollution, and low investment. Effect

Active Publication Date: 2014-01-01
无锡金品环境技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0017] In the existing technology, some theoretical research has made some progress, but there is still a certain distance from the actual application, and it needs to be continuously improved, optimized and developed; some process methods are relatively mature, but the biggest problem is that the investment is large and the effect is slow. , the process is complicated, and the processing and production costs are relatively high

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The technology that reclaims basic chromium sulfate from waste chrome material comprises the steps:

[0028] (1) Put 1000 Kg of chromium slag into the reaction kettle, add 150 Kg of sulfuric acid with a weight percentage of 98%, 70 Kg of sodium formate and 40 Kg of decolorizing clay, and at the same time, send steam at about 100°C to carry out acidification reaction treatment 3h, the acid gas and dust produced are pumped by the air duct to the gas purification device for treatment;

[0029] (2) After the acidification treatment, the slurry discharged from the reaction kettle is passed into the air pressure tank, and the slurry is pressed into the filter press for pressure filtration, and the solid impurities other than chromium components are discharged in the form of filter residue, while the filter press liquid is After being collected by the slurry tank, it is stored in the waste chrome liquid storage tank;

[0030] (3) The waste chrome solution and press filtrate p...

Embodiment 2

[0033] The technology that reclaims basic chromium sulfate from waste chrome material comprises the steps:

[0034] (1) Put 1000 Kg of chromium slag into the reaction kettle, add 80 Kg of sulfuric acid with a weight percentage of 98%, 50 Kg of sodium formate and 20 Kg of decolorizing clay, and simultaneously send in steam at about 95°C to carry out The acidification reaction is treated for 4 hours, and the acid gas and dust generated are pumped through the air duct to the gas purification device for treatment;

[0035] (2) After the acidification treatment, the slurry discharged from the reaction kettle is passed into the air pressure tank, and the slurry is pressed into the filter press for pressure filtration, and the solid impurities other than chromium components are discharged in the form of filter residue, while the filter press liquid is After being collected by the slurry tank, it is stored in the waste chrome liquid storage tank;

[0036] (3) The waste chrome solutio...

Embodiment 3

[0039] The technology that reclaims basic chromium sulfate from waste chrome material comprises the steps:

[0040] (1) Put 1000 Kg of chromium slag into the reaction kettle, add 160 Kg of sulfuric acid with a weight percentage of 98%, 80 Kg of sodium formate and 50 Kg of bleaching clay, and at the same time, send steam at about 110°C to carry out acidification reaction After 2 hours of treatment, the acid gas and dust produced are pumped through the air duct to the gas purification device for treatment;

[0041] (2) After the acidification treatment, the slurry discharged from the reaction kettle is passed into the air pressure tank, and the slurry is pressed into the filter press for pressure filtration, and the solid impurities other than chromium components are discharged in the form of filter residue, while the filter press liquid is After being collected by the slurry tank, it is stored in the waste chrome liquid storage tank;

[0042] (3) The waste chrome solution and ...

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PUM

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Abstract

The invention relates to a process for treatment of heavy metal and recovery of an inorganic salt and especially to a process for preparing basic chromium sulfate by using a waste chromium material. In the process, a waste chromium liquid storage tank, an acidifying device, a reduction device, a reaction vessel, a condensation kettle, a press filtration device, a spray drying device and a gas purifying device are utilized; the process comprises the following steps: collecting electroplating and other chromium-containing waste liquid and waste residue, adding the collected waste liquid and waste residue into an acidifying reaction vessel, optimizing a formula for reagents, removing other impurity components except chromium components through addition and reaction of the reagents and press filtration, carrying out further dehydration by adjusting the condensation kettle for further reaction and preparing the product of basic chromium sulfate by using a centrifugal spray drier. The process provided in the invention is optimized, reasonable, simple and easy, makes the most of natural resources and natural conditions, has the advantages of low production cost, small investment and high yield and enables the problem of waste chromium pollution to be effectively overcome and the waste chromium material to be processed into inorganic chemical products, thereby producing remarkable environmental and economic benefits.

Description

technical field [0001] The invention relates to a process for treating heavy metals and recovering inorganic salts, in particular to a process for preparing basic chromium sulfate by utilizing waste chrome materials. Background technique [0002] Hexavalent chromium compounds are ubiquitous environmental pollutants and are carcinogenic. They are mostly produced in printing and dyeing, electroplating, leather processing, wood preservation, organic synthesis and certain catalyst manufacturing industries. In the process of industrial production, how to control the production of hexavalent chromium compounds and their subsequent treatment is a major environmental protection problem facing the world today. At present, chromium-containing wastewater mainly comes from electroplating chromium and rinsing wastewater, in which the concentration of hexavalent chromium is about 20~300mg / L. As a solid waste with leaching toxicity, chromium slag is numbered HW21 in the "National Hazardou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C01G37/00B09B3/00
Inventor 吴基生张殿海吴迪袁香
Owner 无锡金品环境技术有限公司
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