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Method for preparing ceramsite by taking modified chromium slag as raw material and application of ceramsite

A technology of ceramsite and chromium slag, which is applied in the field of resource utilization of industrial solid waste, can solve the problems of single type of wastewater, complex preparation process, and low utilization rate of chromium slag, and achieve strong immobilization, simple preparation process, and utilization high rate effect

Pending Publication Date: 2022-01-28
WUHAN UNIV OF SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] The purpose of the present invention is to provide a method for preparing ceramsite with modified chromium slag as raw material and the application of ceramsite to solve the problem of low utilization rate of chromium slag and complicated preparation process in the traditional ceramsite preparation method, and the obtained ceramsite is treated as waste water The problem of the single type of wastewater being treated

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  • Method for preparing ceramsite by taking modified chromium slag as raw material and application of ceramsite

Examples

Experimental program
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Effect test

Embodiment 1

[0045] (a) Preparation of ceramsite with modified chromium slag as raw material

[0046] S1. Mixing:

[0047] Grind the chromium slag, calcium oxide, soluble starch and montmorillonite respectively with a grinder until the particle size is less than 100 μm, according to the mass ratio of chromium slag: calcium oxide: soluble starch: montmorillonite is 60:5:8:27 Mix all ingredients well.

[0048] Wherein, the main component and content (mass percentage) of chromium slag are: SiO 2 Content 12.78%, Al 2 o 3 Content 9.99%, Fe 2 o 3 content 42.98%, CaO content 4.45%, MgO content 6.81%, Na 2 O content 1.01%, Cr 2 o 3 Content 6.73%, TiO 2 Content 1.15%.

[0049] S2. Granulation:

[0050] Put the mixture obtained in step S1 in a pelletizing machine, add atomized water accounting for 35% of the total mass of the raw material mixture, granulate through the pelletizing machine, and use a screening machine to screen out green pellets with a particle size of 3-5mm .

[0051] S...

Embodiment 2-3

[0056] A method for preparing ceramsite with modified chromium slag as raw material, compared with Example 1, the difference is that in step S1, the ratios of chromium slag, calcium oxide, soluble starch and montmorillonite are different, respectively Chromium residue in embodiment 2: calcium oxide: soluble starch: the mass ratio of montmorillonite is 45:15:13:27, and chromium residue in embodiment 3: calcium oxide: soluble starch: the mass ratio of montmorillonite is 30: 30:15:25, the others are roughly the same as those in Embodiment 1, and will not be repeated here.

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Abstract

The invention provides a method for preparing ceramsite by taking modified chromium slag as a raw material and application of the ceramsite, the chromium slag, calcium oxide, soluble starch and montmorillonite are mixed, granulated and roasted at high temperature to obtain the ceramsite, and the ceramsite is applied to wastewater treatment. Calcium oxide is used as a modifier, so that a large amount of calcium oxide is attached to the pore surface of the obtained ceramsite, OH-ions and Ca < 2 + > ions are formed on the micropore surface of the ceramsite during wastewater treatment, and the adsorption capacity is improved; montmorillonite and soluble starch have a synergistic effect on the adsorbability of the ceramsite, so that the adsorbability of the ceramsite is improved; the chromium slag utilization rate is high, and stacking of the chromium slag is effectively reduced; the preparation process of the ceramsite is simple, and the selected raw materials are wide in source and low in price; the obtained ceramsite is high in porosity, large in specific surface area and obvious in wastewater treatment effect, and has a fixing effect on Cr < 6 + >; and through simultaneous action of chemical adsorption and physical adsorption of the ceramsite, organic wastewater and inorganic wastewater can be treated, and the sewage treatment variety is wide.

Description

technical field [0001] The invention relates to the technical field of resource utilization of industrial solid waste, in particular to a method for preparing ceramsite by using modified chromium slag as a raw material and the application of ceramsite. Background technique [0002] Chromium compounds are one of the main products of inorganic chemical industry. They are widely used in chemical industry, light industry, metallurgy, textile and machinery industries. About 15% of the products in my country's national economy are related to chromium compounds. Chromium slag is a solid waste discharged during the production of chromium salts. It is extremely toxic because it contains water-soluble hexavalent chromium. If chromium slag is piled up in the open air, it will not only waste land resources, but also cause varying degrees of pollution to groundwater, endangering Human health and growth of plants and animals. With the official implementation of the newly revised "Clean P...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B38/06C04B38/00C04B33/132C04B33/13C02F1/28C02F101/20C02F101/22C02F101/10
CPCC04B38/0645C04B38/009C04B33/132C04B33/131C02F1/281C02F2101/20C02F2101/22C02F2101/105C04B2235/3208Y02P40/60
Inventor 马国军海远浩徐菊郑顶立张翔
Owner WUHAN UNIV OF SCI & TECH