Method for preparing compact refractory material from chromium slag and special system of method

The technology of a refractory material and a special system is applied in the field of harmless reuse of chromium slag, which can solve the problems of environmental pollution, reduction of insoluble hexavalent chromium ions, and ineffective utilization of chromium slag, and achieves simple operation, feasible process, Complete detoxification effect

Pending Publication Date: 2017-01-04
JIANGSU PROVINCE METALLURGICAL DESIGN INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] 3) Wastewater containing hexavalent chromium is discharged after wet detoxification, which will cause certain environmental pollution;
[0007] 4) Insoluble hexavalent chromium ions cannot be completely reduced to trivalent chromium ions, resulting in incomplete wet detoxification
[0011] 3) The chromium slag after detoxification has not been effectively utilized

Method used

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  • Method for preparing compact refractory material from chromium slag and special system of method
  • Method for preparing compact refractory material from chromium slag and special system of method

Examples

Experimental program
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Effect test

Embodiment 1

[0046] The chromium slag is dry-milled in a dry grinding device to keep the particle size of the chromium slag at 180 mesh to 200 mesh. Long bituminous coal is used as reducing agent, and the particle size after grinding is controlled at 80 mesh to 150 mesh, among which the particle size of 80 mesh to 100 mesh is kept at 10%, and the particle size of 100 mesh to 150 mesh is controlled at about 90%.

[0047] Take 100 parts of dry-milled chromium slag, 12 parts of ground bituminous coal, 8 parts of water glass and 13 parts of water and mix them in a mixing device. After mixing evenly, press them into a brick shape. After drying at 200°C until the water content is less than 1%, put it into a high-temperature kiln, reduce and roast at 1350°C for 3 hours, and cool down to about 100°C with the furnace to obtain the finished chromium slag dense refractory brick.

[0048] After inspection, the hexavalent chromium content in the prepared finished chromium slag dense refractory brick sa...

Embodiment 2

[0050] The chromium slag is dry-milled in the dry grinding equipment, and the particle size of the chromium slag is controlled at 180 mesh to 200 mesh. Use semi-coke as the reducing agent, and after grinding, the particle size is controlled at 80 mesh to 150 mesh, wherein the particle size of 80 mesh to 100 mesh is controlled at 10%, and the particle size of 100 mesh to 150 mesh is controlled at 90%.

[0051] Take 100 parts of chrome slag after dry grinding, 12 parts of semi-coke after grinding, 8 parts of water glass and 9 parts of water and mix them in a mixing device, and press them into brick shape after mixing. After drying at 200°C until the water content is less than 1%, put it into a high-temperature kiln, bake it at 1280°C for 3 hours, and obtain the finished chromium slag dense refractory brick after cooling in the furnace.

[0052] After inspection, the hexavalent chromium content in the prepared finished chromium slag dense refractory brick sample is less than 1ppm...

Embodiment 3

[0054] The chromium slag is dry-milled in the dry grinding equipment, and the particle size of the chromium slag is controlled at 180 mesh to 200 mesh. Long bituminous coal is used as reducing agent, and the particle size after grinding is 80 mesh to 150 mesh, wherein the particle size of 80 mesh to 100 mesh is controlled at 10%, and the particle size of 100 mesh to 150 mesh is controlled at 90%.

[0055] Take 100 parts of dry-milled chrome slag, 12 parts of ground bituminous coal, 8 parts of water glass and 6 parts of water and mix them in a mixing device, and press them into adobe after mixing. After drying at 200°C until the water content is less than 1%, put it into a high-temperature kiln, bake it at 1200°C for 4 hours, and obtain the finished chromium slag dense refractory brick after cooling in the furnace.

[0056] After inspection, the hexavalent chromium content in the prepared finished chromium slag dense refractory brick sample is less than 2ppm, the brick is relat...

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Abstract

The invention discloses a method for preparing a compact refractory material from chromium slag and a special system of the method, and belongs to the field of chromium slag reutilization. The method comprises the following steps that (1) the chromium slag, reducing coal, a bonding agent and water are mixed to obtain a mixed material; the mixed material is pressed into a wet brick blank; (2) the wet brick blank is dried and then is subjected to reducing roasting in a high-temperature kiln; after the roasting is finished, cooling along with the kiln is performed to obtain the chromium slag compact refractory material. The invention further discloses the special system for realizing the method; the special system comprises a raw material treatment system, a raw material mixing and forming system and a reducing roasting system. The waste chromium slag is used as a major raw material; a compact refractory brick with the specific gravity of 2.3 to 2.7 g / m<3> is prepared by using the chromium slag as the major raw material through a pyrogenic process; the hexavalent chromium content is smaller than 2ppm; high temperature of 1300 DEG C can be resisted. The method has the advantages that the operation is simple; the process is feasible; the chromium slag detoxification is very thorough; the full reutilization of the chromium slag is realized.

Description

technical field [0001] The invention relates to a method for reusing chromium slag, in particular to a method for preparing dense refractory materials by using chromium slag and a special system for realizing the method, and belongs to the field of harmless reuse of chromium slag. Background technique [0002] Chromium is one of the most important raw materials in modern industry, widely used in chemical industry, ceramics, electronics industry, antiseptic and catalyst and other fields. Chromium slag is the waste slag discharged during the production process of metal chromium and chromium salt. Usually, about 10 tons of chromium slag will be discharged for every 1 ton of metal chromium produced, and 3-5 tons of chromium slag will be discharged for every 1 ton of chromium salt produced. my country's annual discharge of chromium residue is about 200,000 tons, and the accumulated chromium residue has exceeded 3 million tons so far. Among them, the content of hexavalent chromium...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/66C04B35/622
CPCC04B35/66C04B35/62204C04B2235/3201C04B2235/3427C04B2235/422C04B2235/77
Inventor 任中山闫方兴徐刚曹志成薛逊吴道洪
Owner JIANGSU PROVINCE METALLURGICAL DESIGN INST
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