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Method for producing cement clinker from stainless steel cold rolling dewatered sludge ingredient

A technology of dewatered sludge and cement clinker, applied in the field of comprehensive utilization of hazardous waste, can solve the problems of secondary pollution, large primary investment, high treatment cost, etc., and achieve the effect of improving burnability

Inactive Publication Date: 2009-07-08
SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These disposal methods will cause secondary pollution of harmful metal elements to soil and water sources, and there is a great potential risk. At the same time, the primary investment of the above-mentioned treatment methods is also large, and the treatment cost is very high.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] On the cement production line, limestone, clay, stainless steel cold-rolled dewatered sludge (hereinafter referred to as "sludge"), iron ore powder, and coal ash are used as raw materials, and 80 tons of cement raw materials are prepared according to the following weight percentages: limestone 78.6%, clay 12.5% %, sludge 1%, iron ore powder 2.2%, coal powder 5.3%, the cement raw meal prepared by mixing the above raw materials evenly, adopts the existing technology and equipment to burn Portland cement clinker at 1400 °C. The performance indicators of the obtained Portland cement clinker all meet the quality requirements of 525 grade commercial clinker stipulated in GB / T21372-2008 (Portland cement clinker standard), and can stably produce high-quality PC (composite Portland cement ) 32.5R cement products. The leaching toxicity test of harmful metal chromium and nickel in cement clinker conforms to the harmless index of GB5085.3-2007 (identification standard for leaching ...

Embodiment 2

[0018] On the cement production line, 300 tons of cement raw meal are prepared by raw materials according to the following weight percentages: 75% limestone, 10.0% clay, 5.5% sludge, 5.3% coal ash, and 0.5% gypsum. Portland cement clinker is fired at 1350°C. The performance indicators of Portland cement clinker all meet the quality requirements of 525 grade commercial clinker stipulated in GBT21372-2008 (Portland cement clinker standard), and its flexural strength : 6.0MPa for 3 days; 8.8MPa for 28 days; compressive strength: 30.7MPa for 3 days, 55.8MPa for 28 days, and its mineral composition is f-CaO: 0.61%; C 3 S+C 2 S: 72.4%; CaO / SiO 2 : 3.13%, which also meets the requirements of relevant standards. The leaching toxicity test of heavy metal chromium and nickel in cement clinker conforms to the harmless index of GB5085.3-2007 (identification standard for leaching toxicity of hazardous wastes), the total chromium content in heavy metal liquid leaching is only 0.026mg / L, a...

Embodiment 3

[0021] On the cement production line, prepare 80 tons of cement raw meal by raw materials according to the following weight percentages: 74.1% limestone, 12.6% clay, 8% sludge, and 5.3% coal ash. Burn Portland cement clinker at ℃, the corresponding rate of cement clinker is: KH: 0.95, SM: 1.98, IM: 1.6, and the performance indicators of Portland cement clinker have reached GB / T21372-2008 ( Portland cement clinker standard) stipulates the 525 label commodity clinker quality requirements, and can stably produce high-quality PC (composite Portland cement) 32.5R cement products. The leaching toxicity test of harmful metal chromium and nickel in cement clinker complies with the harmless index of GB5085.3-2007 (identification standard for leaching toxicity of hazardous waste), and the total chromium and nickel content in the leaching solution does not exceed the standard requirements.

[0022] The moisture content of the stainless steel cold rolling dewatered sludge used in Example ...

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Abstract

The invention relates to a method for producing cement clinker through utilization of a stainless steel cold-rolled dehydrated sludge ingredient. The method comprises that: stainless steel cold-rolled dehydrated sludge and other materials of a cement green stock are evenly mixed to prepare the cement green stock; the cement green stock comprises the following compositions in percentage by weight: 70 to 79 percent of limestone, 10 to 14 percent of clay, 1 to 8 percent of the stainless steel cold-rolled dehydrated sludge, 5.3 percent of coal ash, 0 to 3 percent of iron ore powder and 0 to 0.5 percent of gypsum; and the prepared cement green stock is sintered to form silicate cement clinker. The obtained cement clinker and a corresponding cement product have no essential difference with the prior silicate cement clinker and a cement product in composition and performance; the quality of the cement clinker and the corresponding cement product meets the index requirement of national corresponding product standard and can be used as a normal high-quality commodity; and the method effectively utilizes and processes industrial sludge containing harmful metal elements, achieves the effects of resource optimization and utilization and has remarkable environment-friendly benefit.

Description

technical field [0001] The invention belongs to the field of comprehensive utilization of hazardous waste, and in particular relates to a comprehensive utilization method of stainless steel cold rolling dewatered sludge. Background technique [0002] Stainless steel cold rolling dewatered sludge contains a certain amount of impurity elements chromium, nickel and fluorine in addition to more calcium oxide and iron oxide, and the environmental pollution hazard of its discharge is obvious. According to the traditional disposal methods of general industrial waste sludge, landfill and incineration are the main methods. These disposal methods will cause secondary pollution of harmful metal elements to soil and water sources, and there is a great potential risk. At the same time, the primary investment of the above-mentioned treatment methods is also large, and the treatment cost is very high. [0003] In the production method of Portland cement, the clinker is calcined by raw mat...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24C02F11/00C02F103/16
CPCC04B7/24Y02P40/10C04B7/02C04B7/26C04B7/60
Inventor 陈志传陈袁魁胡志刚陈昌铭毛谙章廖蔚峰薛志强王卫红孙育斌刘大海
Owner SHENZHEN SHENTOU ENVIRONMENT TECH CO LTD
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