Harmless treatment process for waste chromium slag

A technology of harmless treatment and process method, applied in the direction of solid waste removal, etc., can solve problems such as harm to farmland and aquatic organisms, carcinogenicity, secondary environmental pollution, etc., and achieve broad prospects for comprehensive utilization, cost reduction, and large disposal volume. Effect

Inactive Publication Date: 2008-08-27
赵建国
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] The harmful components in waste chromium slag are mainly hexavalent ions such as water-soluble sodium chromate and acid-soluble calcium chromate; the waste chromium slag piled up in the open air has been washed by rain for a long time, and a large amount of hexavalent chromium ions have dissolved and infiltrated into the ground surface with rainwater. , pollute groundwater, rivers, and lakes, and also endanger farmland and aquatic organisms. Hexavalent chromium ions are very harmful to human health. Its compounds have strong oxidative properties and are harmful to the digestive tract, respiratory tract, skin, and mucous membranes of the human body. People who have been exposed to hexavalent chromium compounds for a long time will cause chromium poisoning, and cause headaches, fatigue, weight loss, anorexia, liver and kidney damage, chromium compounds also have carcinogenic effects, especially lung cancer; The waste chromium slag from harmful chemical treatment is used as some industrial raw materials. Due to its chemical characteristics, it will cause secondary pollution to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0013] Embodiment one: if figure 1 , mix 430kg of waste chrome slag with 150kg of fly ash, 120kg of zinc kiln slag, and 300kg of red mud evenly, crush it with a ball mill to 80 mesh fineness, send it to a sintering furnace for physical and chemical treatment, sinter at a high temperature of 1050°C for 3 hours, and then cool it out for 2 hours , the sintered slag was crushed to 50 mesh and soaked in water for 24 hours, then filtered out the slag with a filter cloth, and the filtrate was filtered with FeSO 4 As a reducing agent, FeSO 4 Adding a large amount is fifteen times of the hexavalent chromium ion measured in the filtrate to carry out the reduction reaction, adding FeSO 4 After adjusting the filtrate, under the condition of pH value of 8, the hexavalent chromium ion in the filtrate is reduced to the harmless precipitate of trivalent chromium salt; the waste gas generated during the sintering process is sucked into the washing tower for spray washing, The sediment genera...

Embodiment 2

[0014] Embodiment two: see Figure II , mix 450kg waste chrome slag with 100kg fly ash, 150kg zinc kiln slag and 300kg red mud evenly, crush it with a ball mill to 50 mesh fineness, send it to a sintering furnace for physical and chemical treatment, sinter at 1000°C for 4 hours, and then cool it out for 3 hours , the sintered slag was crushed to 50 mesh and soaked in water for 22 hours, then filtered out the slag with a filter cloth, and the filtrate was filtered with FeSO 4 As a reducing agent, FeSO 4 The addition of a large amount is fourteen times of the hexavalent chromium ion measured in the waste chromium slag to carry out the reduction reaction, adding FeSO 4 After adjusting the filtrate, the hexavalent chromium ions in the filtrate are reduced to harmless precipitates of trivalent chromium salts under the condition of pH value of 8.2; the waste gas generated during the sintering process is sucked into the washing tower for spray washing, The sediment generated after ...

Embodiment 3

[0015] Embodiment three: see Figure II , mix 400kg of waste chromium slag with 150kg of fly ash, 150kg of zinc kiln slag, and 300kg of red mud evenly, crush it with a ball mill to a fineness of 60 mesh, send it to a sintering furnace for physical and chemical treatment at 1100°C for 4 hours of high-temperature sintering, and then leave the furnace to cool for 3 hours. The sintered slag was crushed to 50 mesh and soaked in water for 20 hours, then filtered out the slag with a filter cloth, and the filtrate was filtered with FeSO 4 As a reducing agent, FeSO 4 The addition of a large amount is sixteen times of the hexavalent chromium ion measured in the waste chromium slag to carry out the reduction reaction, adding FeSO 4 After adjusting the filtrate, the hexavalent chromium ions in the filtrate are reduced to harmless precipitates of trivalent chromium salts under the condition of pH value of 8.5; the waste gas generated during the sintering process is sucked into the washing...

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Abstract

The invention relates to an innocent treatment method of waste chromic slag, which comprises: mixing the waste chromic slag, coal ash, zinc stove slag, and red mud at the weight percents of waste chromic slag in 40-45%, the coal ash in 10-15%, the zinc stove slag in 10-15% and the red mud in 28-30% to be broken into 50-80 items and deoxidized sintered in the sintering furnace at the temperature of 1000-1100Deg. C; the sintered mixture after cooled for 2-3 hours is dipped for 20-26 hours to filter the slag via filter cloth, while the filter solution uses FeSO4 as reducing agent whose amount is 14-16 times of Cr6+ of waste chromic slag, therefore, the filter solution can process reducing reaction at the pH valve of 8-8.5; the waste gas generated in sintering is fed into washing tower to be washed, and the generated water vapor is all discharged. The invention can overcome the defect of present method which can not process innocent treatment, to reduce the nocuous elements of waste chromic slag and avoid the environment pollution.

Description

Technical field: [0001] The invention belongs to the technical field of harmless treatment of waste chromium slag. Background technique: [0002] Chromium slag is the waste slag discharged from the production of sodium dichromate and metal chromium. The chromium slag contains oxides of magnesium, calcium, silicon, iron, aluminum and unreacted chromium trioxide, as well as water-soluble sodium chromate and acid Soluble calcium chromate. At present, waste chromium residue is mainly used as industrial waste and piled up on some idle land. Some products and technologies also use waste chromium residue as industrial raw materials, such as for the manufacture of calcium magnesium phosphate fertilizer, cast stone, cement additives or glass colorants, etc. , but these are based on the utilization of waste chromium slag without harmless treatment. [0003] The harmful components in waste chromium slag are mainly hexavalent ions such as water-soluble sodium chromate and acid-soluble...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09B3/00
Inventor 赵建国
Owner 赵建国
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