Device and method for preparing cement and co-producing sulfuric acid by cooperating high-temperature liquid blast furnace slag with phosphogypsum/desulfurized gypsum

A technology for desulfurizing gypsum and blast furnace slag, which is applied in cement production, chemical instruments and methods, sulfur compounds, etc. It can solve problems such as long decomposition time, unstable strength, and large size, so as to increase the concentration of SO2 gas, reduce energy consumption and Equipment investment, avoiding the effect of complicated process

Active Publication Date: 2022-02-08
上海驰春节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] However, the decomposition temperature of phosphogypsum and desulfurized gypsum is high (1100-1200℃), and the decomposition time is long. Liquid phase, and after the liquid phase wraps phosphogypsum and desulfurized gypsum, it will further prevent the decomposition of phosphogypsum and desulfurized gypsum, thus prolonging the decomposition time of phosphogypsum and desulfurized gypsum, causing the preheater and decomposition furnace to stick to the wall and frequently block Therefore, it is difficult to choose the decomposition technology outside the kiln for cement production, and only the dry long kiln production process can be used for production. The size of the kiln is large, the energy consumption is high, the investment is la

Method used

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  • Device and method for preparing cement and co-producing sulfuric acid by cooperating high-temperature liquid blast furnace slag with phosphogypsum/desulfurized gypsum
  • Device and method for preparing cement and co-producing sulfuric acid by cooperating high-temperature liquid blast furnace slag with phosphogypsum/desulfurized gypsum
  • Device and method for preparing cement and co-producing sulfuric acid by cooperating high-temperature liquid blast furnace slag with phosphogypsum/desulfurized gypsum

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Experimental program
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Effect test

Embodiment 1

[0048] Embodiment 1: High-temperature liquid slag cooperates with phosphogypsum to make cement and co-produce sulfuric acid

[0049] Such as figure 1 As shown, in this embodiment, a device and method for co-producing sulfuric acid with high-temperature liquid slag in conjunction with phosphogypsum for cement production are provided, as follows:

[0050] Phosphogypsum gypsum has a high water content, contains soluble phosphorus, heavy metals, and fluoride, and needs to be washed with water. In this embodiment, in order to avoid the consumption of a large amount of water resources for washing, and to deal with the discharged sewage, the problem of increasing costs is to use a spiral The extruder squeezes out the physical water, and then enters the fixed bed drying furnace for drying and preheating while removing low-boiling fluorine and phosphorus, and the drying tail gas is washed and emptied. The detailed process is as follows:

[0051] Phosphogypsum first enters the molding ...

Embodiment 2

[0086] Example 2: High temperature liquid slag cooperates with desulfurization gypsum to make cement and co-produce sulfuric acid

[0087] In this embodiment, a high-temperature liquid slag is provided to cooperate with desulfurization gypsum to produce cement and co-produce sulfuric acid, as follows:

[0088] The desulfurized gypsum has low water content, and it can directly enter the fluidized bed equipped with ceramic balls combined with the air flow bed for drying and crushing, and the exhaust gas after drying is dedusted and emptied. The details are as follows:

[0089] The desulfurized gypsum first enters the drying and crushing system. The desulfurized gypsum passes through the silo 7-1 to control the feeding amount, and is transported to the conveyor 7-2 to the fluidized bed combined with entrained flow bed drying and crushing furnace 7; the fluidized bed combined with entrained flow bed is dried The furnace cloth air plate of the crushing furnace 7 is pre-installed wi...

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Abstract

The invention discloses a device and a method for preparing cement and co-producing sulfuric acid from high-temperature liquid blast furnace slag and ardealite/desulfurized gypsum, and relates to the field of solid waste resource utilization, and the device comprises a gypsum crushing and drying system and a fluidized pre-decomposition system communicated with the gypsum crushing and drying system; the lower end of the liquid-state fluidization pre-decomposition system is communicated with the slag liquid receiving and sintering system, the top of the liquid-state fluidization pre-decomposition system is connected with the cyclone separation system, the bottom of the slag liquid receiving and sintering system is communicated with the sintered liquid-state cement atomization pulverization and cooling heat exchange boiler system, and the top of the cyclone separation system is communicated with the acid making system. Compared with the prior art, the method has the beneficial effect that high-value and high-efficiency resource utilization of the blast furnace slag, the phosphogypsum or the desulfurized gypsum is realized.

Description

technical field [0001] The invention relates to the field of resource utilization of solid waste, in particular to a device and a method for co-producing sulfuric acid with high-temperature liquid blast furnace slag and phosphogypsum / desulfurized gypsum for cement production. Background technique [0002] my country's steel output accounts for more than 56% of the world's total. Crude steel output exceeded 1 billion tons for the first time, and pig iron nearly 900 million tons. The production of 1 ton of pig iron produces 0.3-0.6 tons of blast furnace slag. When the blast furnace slag is discharged from the blast furnace, the temperature is about 1450°C, and its sensible heat reaches 1621.6KJ / Kg. The blast furnace slag treatment currently adopts the water quenching process, and the heat of the blast furnace slag is basically not recovered; the main chemical components of the blast furnace slag are CaO, SiO 2 、Al 2 o 3 And MgO, which account for more than 95% in blast furn...

Claims

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Application Information

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IPC IPC(8): C04B7/24C04B7/147C04B7/04C04B7/40C04B7/43C04B7/44C01B17/50C01B17/76
CPCC04B7/24C04B7/147C04B7/04C04B7/40C04B7/43C04B7/44C01B17/506C01B17/76Y02P40/10
Inventor 郁国忠李志远
Owner 上海驰春节能科技有限公司
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