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Dicyandiamide black slag resource utilization treatment process

A treatment process and technology of dicyandiamide, applied in the direction of carbide, calcium carbide, calcium/strontium/barium oxide/hydroxide, etc., can solve problems such as consumption, decrease in output of cement and non-sintered bricks, etc.

Inactive Publication Date: 2020-08-25
东阳市琰安建筑工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are three kinds of dicyandiamide black slag that have been industrially processed, namely the production of cement, coking coal, and non-fired bricks. However, when producing the above three commodities, the waste slag is only used as an auxiliary raw material, and only a small amount of waste slag can be consumed. Now that the construction industry is in a downturn, the output of cement and non-fired bricks is also declining, so it is urgent to find a method that can handle a large amount of dicyandiamide black slag

Method used

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  • Dicyandiamide black slag resource utilization treatment process

Examples

Experimental program
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Effect test

Embodiment 1

[0028] A dicyandiamide black slag resource utilization treatment process, the main scheme of which is:

[0029] According to the number of parts by mass, dry 1000kg of dicyandiamide black slag in the drying equipment until the moisture content is 0.8%, and the temperature is 80°C, then sieve the waste slag with a 150-mesh standard sieve, and keep the undersieve, and sieve The coarse slag is separated and enters the winnowing equipment, and the air volume of winnowing is controlled to be 62.1m 3 / h, collect the settled waste slag and combine it with the sieve; then add 6% binder and 5% quality improving agent to the obtained waste slag, mix it evenly and mold it under 8MPa, then place the formed waste slag in 800 ℃, carbonization at an atmosphere pressure of 0.1MPa for 20 hours, drying at 80 ℃ for 30 minutes after completion, and then calcining at 900 ℃ for 120 minutes, and the finished product of activated calcium oxide can be obtained after completion.

[0030] Described bin...

Embodiment 2

[0039] A dicyandiamide black slag resource utilization treatment process, the main scheme of which is:

[0040] According to the number of parts by mass, 1100kg of dicyandiamide black slag is dried in a drying equipment until the moisture content is 1.5%, and the temperature is 90°C, and then the waste residue is sieved with a 200-mesh standard sieve, and the sieved material is retained. The coarse slag is separated and enters the winnowing equipment, and the air volume of winnowing is controlled to be 65.5m 3 / h, collect the settled waste slag and combine it with the sieve; then add 9% binder and 7% quality improving agent to the obtained waste slag, mix it evenly and mold it under 10MPa, then place the formed waste slag in 100 ℃, carbonization under the pressure of 0.5MPa for 15 hours, after completion, dry at 100 ℃ for 45 minutes, and then calcinate at 960 ℃ for 180 minutes, and the finished product of activated calcium oxide can be obtained after completion.

[0041] Desc...

Embodiment 3

[0050] A dicyandiamide black slag resource utilization treatment process, the main scheme of which is:

[0051] According to the number of parts by mass, dry 1200kg of dicyandiamide black slag in the drying equipment until the moisture content is 2.3%, and the temperature is 100°C, then sieve the waste slag with a 250-mesh standard sieve, and keep the undersieve, and sieve The coarse slag is separated and enters the winnowing equipment, and the air volume of winnowing is controlled to be 68.7m 3 / h, collect the settled waste slag and combine it with the sieve; then add 11% binder and 8% quality improving agent to the obtained waste slag, mix well and mold it under 13MPa, then place the formed waste slag at 120 ℃, carbonization under the pressure of 1 MPa for 10 hours, after completion, dry at 120 ℃ for 60 minutes, and then calcinate at 980 ℃ for 240 minutes, and the finished product of activated calcium oxide can be obtained after completion.

[0052] Described binder is a ki...

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Abstract

The invention relates to the field of environmental protection, in particular to a dicyandiamide black slag resource utilization treatment process. The invention provides a method for resource utilization of dicyandiamide black slag. According to the invention, a large amount of dicyandiamide black slag can be treated and resource utilization is realized. The method comprises the following steps:firstly, improving the content of calcium carbonate in dicyandiamide black slag through screening and winnowing; then providing a modified glutinous rice pulp inorganic adhesive and adding a quality improving agent to enable formed waste residues to meet the production strength requirement of a lime kiln, and carbonizing and calcining to prepare an active calcium oxide finished product with a highcalcium oxide content, a low impurity content, a loose structure and high activity. The active calcium oxide finished product can be used in a process for producing dicyandiamide from calcium carbideto achieve the purpose of cyclic utilization; according to the method, a large amount of dicyandiamide black slag can be treated with high quality, the environment can be protected, resources can berecycled, and the method has high economic value.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a resource utilization treatment process of dicyandiamide black slag. Background technique [0002] Dicyandiamide black slag is one of the three largest industrial waste residues in China. It is a dry waste slag produced during the production of dicyandiamide. Its main components include calcium carbonate, graphitized carbon, free carbon and A small amount of inorganic impurities. [0003] CN1493537A discloses a treatment method of dicyandiamide waste residue, which is characterized in that the cyanide in the waste residue is oxidized to cyanate, and the cyanate then releases carbon dioxide and nitrogen, and the waste residue after this treatment is modified waste residue. Modified waste slag can be mixed with cementitious materials to make ceramsite. This invention makes the dicyandiamide waste slag completely treated, not only converts the cyanide in the waste slag int...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/06C01F11/04C01F11/02C09J1/00C09J11/08C08H99/00C01B32/942
CPCC01B32/942C01F11/02C01F11/04C01F11/06C01P2002/82C01P2006/80C08H99/00C09J1/00C09J11/08
Inventor 李荣竹刘冬朱启明
Owner 东阳市琰安建筑工程有限公司
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