Process for preparing basic chromium sulfate by using waste chromium material

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

Active Publication Date: 2012-05-02
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 develope

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), 1000Kg of chromium slag is added in the reaction kettle, and adding 150Kg of sulfuric acid, 70Kg of sodium formate and 40Kg of bleaching clay with a percentage by weight of 98% is added, and steam at about 100°C is sent into it at the same time, and acidification reaction is carried out for 3 hours to produce The acid gas and dust 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 ch...

Embodiment 2

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

[0034] (1) Add 1000Kg of chromium slag into the reaction kettle, add 80Kg of sulfuric acid with a weight percentage of 98%, 50Kg of sodium formate and 20Kg of bleaching clay, and simultaneously send in steam at about 95°C for acidification reaction treatment 4h, the acid gas and dust produced are pumped by 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 chromium liquid and press filtrate produced by electr...

Embodiment 3

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

[0040] (1), 1000Kg of chromium slag is added in the reactor, and add the sulfuric acid 160Kg, sodium formate 80Kg and bleaching clay 50Kg of 98% by weight percentage composition, send into the steam of about 110 ℃ of steam simultaneously, carry out acidification reaction treatment 2h, The generated acid gas and dust 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 chromium liquid and press ...

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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 electrochrome plating 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 Hazardous ...

Claims

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Application Information

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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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