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Carbide slag powdering process and system

A technology of powder making system and calcium carbide slag, which is applied in the field of calcium carbide slag powder making technology and system, which can solve the problems of low desulfurization efficiency, insufficient oxygen content, easy absorption of water and moisture of calcium carbide slag and block the screen, etc., and achieves high screening accuracy and is not easy The effect of bonding and ensuring long-term stable operation

Active Publication Date: 2012-06-27
ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The drying system of this desulfurization system adopts a dryer. Since hot air is used to dry calcium carbide slag, the temperature is relatively low. The residual sulfur and phosphorus ions in the slag cannot be oxidized and will still be brought into the desulfurization system, causing certain adverse effects on the oxidation of the wet desulfurization system; When the powder is less than 250 mesh, the calcium carbide slag part is easy to absorb water and wet and block the screen; the method disclosed in this invention patent can only be applied to the calcium spraying desulfurization system in the circulating fluidized bed boiler furnace, and the desulfurization efficiency is low, so it cannot be directly applied to wet desulfurization system

Method used

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  • Carbide slag powdering process and system
  • Carbide slag powdering process and system
  • Carbide slag powdering process and system

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Experimental program
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Effect test

Embodiment 1

[0036] A certain place is rich in calcium carbide slag resources, the price of carbide slag is 30-50 yuan / ton, and there is a stable source of raw materials. The price of limestone is between 150-300 yuan / ton according to the quality difference, and the price of lime is 400-600 yuan / ton. There are many coal-fired power plants within 300 kilometers, and 90% of them adopt desulfurization processes such as limestone-gypsum wet method, carbide slag-gypsum wet method, and slaked lime semi-dry method.

[0037] The calcium carbide slag powder preparation project has an investment of 5 million yuan, a total installed capacity of 300Kw, an annual output of 80,000 tons, an operating cost of 2 million yuan, and a finished carbide slag powder price of 150-200 yuan / ton, bringing economic benefits of more than 5 million yuan per year.

Embodiment 2

[0039] A calcium carbide slag mill adopts the process system provided by the patent of the present invention. The quality parameters of the calcium carbide slag feed are: moisture content -32%, Ca(OH) 2 -85% (dry basis), CaCO 3 -11% (dry basis), impurity (containing sulfur, phosphorus and other reducing substances) -4%, COD-9.3mg / g (dry basis), directly applied to this calcium carbide slag desulfurization system, hourly calcium carbide slag (wet base) consumption is 12t, the gypsum purity of the desulfurization system is 89.5%, the sulfite content is 6%, the COD of desulfurization wastewater raw water is 800mg / L, and it can reach 300mg / L by aeration treatment.

[0040] When processing the calcium carbide slag, the temperature of the rotary kiln is controlled at 850-900°C, and the powder separator with a particle size greater than 325 mesh is sent back to the ball mill for circular grinding. , Ca(OH) 2 -31.6%, CaCO 3 -1.5%, impurity (containing sulfur, phosphorus and other r...

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Abstract

The invention discloses a carbide slag powdering process and a carbide slag powdering system and belongs to the field of resource and environment protection. The carbide slag powdering system comprises a drying system, a grinding system and a powder selecting system, wherein the drying system comprises a rotary kiln, a furnace, a first draught fan and a rotary kiln feeding bin, wherein one side of the rotary kiln is communicated with the furnace, and the other side of the rotary kiln is communicated with the first draft fan and the rotary kiln feeding bin; the grinding system comprises a pre-grinding bin which is communicated with the outlet of the rotary kiln and a ball mill which is communicated with the outlet of the pre-grinding bin; the powder selecting system comprises a powder selecting machine which is communicated with the outlet of the ball mill; and hopper lifting machines are arranged at the positions of the rotary kiln feeding bin, the furnace and the pre-grinding bin. According to the process disclosed by the invention, the carbide slag is processed by the system and prepared by the system into qualified desulfurizing agent for wet desulphurization, reducing matters containing phosphorus, sulfur and the like in the carbide slag are oxidized in a high-temperature environment while the carbide slag is dried, and high-quality carbide slag desulfurizing agent can be obtained by more accurate screening.

Description

technical field [0001] The invention relates to the field of resources and environmental protection, in particular to a process and system for making powder from carbide slag. Background technique [0002] The production of acetylene by the calcium carbide method in China will inevitably produce calcium carbide slag (pulp), an auxiliary industrial waste, and there are currently two main digestion routes for carbide slag (pulp). One is to dehydrate the calcium carbide slurry to form dry slag as a raw material for the production of cement and other building materials; the other is to filter and purify the calcium carbide slurry to replace calcium carbonate and use it as a desulfurizer in the desulfurization system of the power plant. [0003] The eighth phase of the thermal power plant of Zhejiang Juhua Group adopts the NID semi-dry desulfurization process introduced by Zhejiang Feida Electromechanical Group Company from ABB Company of Sweden, and uses calcium carbide slag dry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D53/50B09B3/00
Inventor 夏纯洁莫建松吴忠标周觅
Owner ZHEJIANG TIANLAN ENVIRONMENTAL PROTECTION TECH
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