Device and method for preparing silicon-calcium base material and sulfuric acid from industrial byproduct gypsum

A technology for industrial by-products of gypsum and calcium silicon, which is applied in the field of solid waste recycling, can solve the problems of difficulty in ensuring the atmosphere, reduced processing intensity of the rotary kiln, and easy scarring of materials in the kiln, so as to reduce the decomposition reaction temperature and improve the product quality. Economic value, reducing the effect of the powder homogenization process

Pending Publication Date: 2022-02-08
INST OF PROCESS ENG CHINESE ACAD OF SCI
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Problems solved by technology

[0008] However, in the prior art, the use of industrial by-product gypsum to produce cement and co-produce sulfuric acid involves two key steps: gypsum reduction and cement firing (cement clinker produced from gypsum reduction products), but the temperature of the gypsum decomposition process is 1200-1350 ° C, which requires reduction Atmosphere, while the firing temperature of cement is 1300-1450°C, which requires an oxidizing atmosphere. There is a temperature cross in the reaction process, and the atmosphere is difficult to guarantee. It is difficult to control in a rotary kiln, and the materials in the kiln are easily scarred. Therefore, the operating temperature requires In an extremely narrow interval control, the coal consumption is high, which leads to the reduction of the treatment intensity of the rotary kiln, the increase of the amount of combustion air, and the flue gas SO 2 The concentration of the sulfur

Method used

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  • Device and method for preparing silicon-calcium base material and sulfuric acid from industrial byproduct gypsum
  • Device and method for preparing silicon-calcium base material and sulfuric acid from industrial byproduct gypsum

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Embodiment 1

[0078] This embodiment provides a kind of industrial by-product gypsum to prepare the device of silicon-calcium base material and sulfuric acid, such as figure 1 As shown, the device includes a slurry mixer 2, a solid-liquid separator 4, a filter cake breaker 5, and a dry decomposition reactor 8 connected in sequence;

[0079] Wherein, a carbon material inlet, a gypsum inlet, a washing water inlet and a slurry outlet are set on the slurry mixer 2, and the slurry outlet is connected to the inlet of the solid-liquid separator 4, and the slurry outlet is connected to the inlet of the solid-liquid separator 4. A slurry mixing pump 2 is set on the pipeline between the mixer and the solid-liquid separator 4; a carbon material pulverizer 1 is set at the carbon material inlet; the solid outlet of the solid-liquid separator 4 is connected to the filter The inlet of the cake breaker 5 is connected; the circulating water inlet is set on the slurry mixer 2, and the liquid outlet of the solid

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Abstract

The invention provides a device and a method for preparing a silicon-calcium base material and sulfuric acid from industrial byproduct gypsum. The device comprises a slurrying mixer, a solid-liquid separator, a filter cake crusher and a drying and decomposing reactor which are connected in sequence. A gas outlet of the drying and decomposing reactor is connected with a gas inlet of a sulfur dioxide-to-sulfuric acid device, and a solid outlet of the drying and decomposing reactor is connected with an inlet of a silicon-calcium base material collector. By utilizing the device disclosed by the invention, slurrying and mixing of industrial byproduct gypsum and a carbon material can be realized, a filter cake obtained by solid-liquid separation is mixed with fuel and combustion-supporting gas for reduction pyrolysis, the processes of gypsum drying and powder homogenization are reduced, SO2 in pyrolysis gas is recovered to obtain a sulfuric acid product by specially taking gypsum decomposition as a target, the obtained silicon-calcium base material not only can be used for producing carbon reduction type cement clinker, but also can be used for acid soil regulators, adhesives and the like, and the economic value of the product is improved.

Description

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Claims

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Application Information

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Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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