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Novel technique for producing concrete by using hygroscopic state sewage sludge waste slag B grade mixture material

A technology of one-stage batching and new process, applied in the field of new energy-saving technology for two-stage batching, can solve the problem of single-stage batching being unfavorable for the utilization of water-containing sludge waste residue, and achieve the effects of easy environmental protection, elimination of pollution, and wide range of benefits and wastes.

Inactive Publication Date: 2008-05-07
尹小林
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is: to solve the problem that the single-stage batching of the existing cement technology is not conducive to the utilization of water-containing sludge waste, and to provide a simple process, low investment, and can save a lot of drying and grinding energy consumption. Save water resources and save natural mineral resources, make extensive use of sludge and waste, reduce CO emissions 2 , Energy-saving and environmentally friendly new process for producing cement by using wet sludge and waste residue secondary ingredients

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Embodiment 1: A certain cement factory in Guangxi has 2 shaft kiln lines and 1 rotary kiln line, and utilizes the sugar filter mud of the local sugar factory, and the sugar filter mud moisture content is 29.4%, CaO46.42%, SiO 2 3.21%, Al 2 o 3 4.12%, Fe 2 o 3 0.89%, MgO5.72%, LOSS 39.26%, industrial analysis low calorific value 1580×4.18KJ / kg, sugar filter mud material is highly viscous and very difficult to dry. Trial production adopts two-stage batching process, using sugar filter mud to replace all limestone batching, designed as silicate clinker, and needs to supplement the element component as SiO 2 、Al 2 o 3 , Fe 2 o 3 , in order to facilitate vertical kiln firing and do not affect the trial of rotary kiln, add 2% coal (12% coal is usually used in vertical kiln batching), and the coal ash is included in the batching composition design. The dry powder in the pilot production is made of coal ash, shale, sulfuric acid mud, manganese slag, and coal, and the...

Embodiment 2

[0024] Example 2: Sludge from a sewage treatment plant in a certain city in Hunan has a water content of 79.8% after draining, and it is very difficult to dry and utilize. The average chemical analysis composition is SiO 2 19.36%, Fe 2 o 3 2.39%, Al 2 o 36.47%, CaO 8.21%, MgO 0.73%, LOSS 62.35%, and the average calorific value measured by the differential thermal analyzer is 1359×4.18KJ / kg. The test adopts a two-stage batching process. The sludge is used to replace clay brick raw materials and some calcium raw materials. It is designed as a silicate clinker, and the supplementary element component is mainly calcium. First-level batching Limestone, steel slag, and anthracite are metered and batched, and ground to a fineness of 0.08mm, and 10-12% of the dry material is sieved, and then the dry powder and sludge are pre-mixed after the second-level metering and batching, and then homogenized by a homogenizer , in the secondary metering batching, percentage by weight, dry po...

Embodiment 3

[0025] Example 3: In the vertical resource kiln production line of a factory in Zhuzhou, Hunan, calcium carbide slag in PVC production is used to replace limestone. The average moisture content of calcium carbide slag is 35%, and the chemical composition dry basis CaO content is 67.9%, SiO 2 5.13%, Fe 2 o 3 2.32%, Al 2 o 3 3.76%, CaO3.42%, the target clinker is designed as silicate clinker, the rate value is controlled KH0.95~1.05, n2.0±0.1, P1.8±0.2, and the primary ingredients are silica sand, fly ash, Steel slag, anthracite, and mineralizer are metered and batched by ball mill to make raw meal dry powder with a fineness of 0.08mm and the sieve residue <14%. The secondary batching is raw meal dry powder and wet calcium carbide slag. Percentage, dry powder: calcium carbide slag = 20-40%: 80-60%, pre-mixed, homogenized by a homogenizer, formed into a Φ10mm rod by an extrusion molding machine, and sent to a vertical kiln for calcination. The output of the vertical kiln is ...

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Abstract

The invention relates to a new technique by adopting two-stage ingredients of wet mud and slag to produce cement. The technique comprises the steps as follows: wet industrial waste residue or sludge at sewage of the city or water treatment sewage are adopted as raw materials after filter-press, or centrifugal dewatering or drying, two-stage dry-wet matching with the material through one-stage matching powder milling is performed, a material stick or a material ball is produced after being mixed equably, and the material stick or the material ball enters into the cement kiln to burn into clinker after being dried by waste heat. The invention has simple process, good capability of large drying and powder milling energy consumption conservation, great adoption of mud waste residue and distinct effects in reducing CO2, water resource and natural mineral resource conservation, energy conservation and environmental protection.

Description

Technical field: [0001] The invention relates to a new process technology in the comprehensive utilization of resources, energy saving and emission reduction and environmental protection of the cement industry, in particular to a secondary batching energy-saving method for producing cement clinker by using water-containing industrial waste residue, urban sewer sludge and water treatment sludge batching New process technology method. Background technique: [0002] For more than 100 years in the cement industry, in order to strive for uniform chemical composition of raw materials, single-stage batching has been used, that is, the raw materials of each component or raw materials and fuels are combined with CaO, SiO 2 、Al 2 o 3 , Fe 2 o 3 The chemical composition of etc. requires ingredients to be ground together to make raw materials. In addition to the wet rotary kiln process with high energy consumption, the grinding of raw materials needs to control the moisture content...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/24
CPCC04B7/367C04B7/24C04B7/42Y02P40/10
Inventor 尹小林
Owner 尹小林
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