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Recycling method for silicon dioxide calcium sulfate hydrate solid waste containing elemental sulfur

A technology of calcium sulfate hydrate and silicon dioxide, which is applied in the field of resource utilization of sulfur-containing solid waste, can solve the problems that cannot reflect environmental protection and economy

Pending Publication Date: 2021-11-16
四川天人能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This technology only recovers the manganese and ignores the remaining sulfur, silicon dioxide, and calcium sulfate mixture. The new hazardous waste is not treated, which cannot reflect its environmental protection and economical efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0011] Embodiment 1: A kind of solid waste containing elemental sulfur silicon dioxide calcium sulfate hydrate, containing elemental sulfur 10%, silicon dioxide 16%, the rest is calcium sulfate, add solid waste weight 10% finely ground carbon powder, solid waste The waste is sent to a closed container, and an excess of 8 times oxygen (or air or oxygen-enriched air) is circulated, heated to 250°C, and kept for 160 minutes, elemental sulfur reacts with oxygen to produce sulfur dioxide gas, carbon reacts with oxygen to produce carbon dioxide, and the cycle obtained The gas containing sulfur dioxide, carbon dioxide and oxygen is sent into the gas to synthesize sulfur trioxide through the process; at the same time, the dehydration microcrystalline solid of calcium sulfate and silicon dioxide with a loose structure without elemental sulfur is obtained. Anhydrite is molded with water for better strength.

Embodiment 2

[0012] Embodiment 2: A kind of solid waste containing elemental sulfur silicon dioxide calcium sulfate hydrate, containing elemental sulfur 8%, silicon dioxide 14%, all the other are calcium sulfate, add solid waste weight 7% finely ground carbon powder, solid waste The waste is sent to a closed container, and an excess of 6 times oxygen (or air or oxygen-enriched air) is circulated, heated to 260°C, and kept for 120 minutes, elemental sulfur reacts with oxygen to produce sulfur dioxide gas, carbon reacts with oxygen to produce carbon dioxide, and the cycle obtained The gas containing sulfur dioxide, carbon dioxide and oxygen is sent into the gas to synthesize sulfur trioxide through the process; at the same time, the dehydration microcrystalline solid of calcium sulfate and silicon dioxide with a loose structure without elemental sulfur is obtained. Anhydrite is molded with water for better strength.

Embodiment 3

[0013] Embodiment 3: A kind of solid waste containing elemental sulfur silicon dioxide calcium sulfate hydrate, solid waste contains elemental sulfur 6%, silicon dioxide 12%, the rest is calcium sulfate, add solid waste weight 5% finely ground carbon powder, Send the solid waste into a closed container, circulate through an excess of 4 times oxygen (or air or oxygen-enriched air), heat it to 280°C, and keep it for 90 minutes. Elemental sulfur reacts with oxygen to produce sulfur dioxide gas, and carbon reacts with oxygen to produce carbon dioxide. The circulating gas containing sulfur dioxide, carbon dioxide and oxygen is sent into the gas to synthesize sulfur trioxide through the process; at the same time, a dehydration microcrystalline solid of calcium sulfate and silicon dioxide with a loose structure without elemental sulfur is obtained. The microcrystalline solid is formed after adding water. It has better strength than anhydrous gypsum plus water molding.

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PUM

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Abstract

The invention relates to a recycling method for silicon dioxide calcium sulfate hydrate solid waste containing elemental sulfur. The recycling method comprises the following steps: grinding carbon powder, introducing excessive oxygen for circulation, and conducting heating to convert sulfur into sulfur dioxide, convert carbon into carbon dioxide, convert mixed gas into sulfur trioxide and simultaneously obtain calcium sulfate and silicon dioxide dehydrated microcrystalline solids with loose structures.

Description

technical field [0001] The invention relates to the fields of chemical industry, energy saving and environmental protection, and is a method for recycling sulfur-containing solid waste. Background technique [0002] Flue gas and coal gas desulfurization are common processes for cleaning gas in the chemical industry. Dry desulfurization is widely used because of its advantages of low pollution and low energy consumption. The desulfurizer is a mixture containing iron, calcium, aluminum, silicon and other oxides. The desulfurizer itself is a non-hazardous chemical product and has no pollution to the human body and the environment. The waste desulfurizer is a kind of A hazardous waste. [0003] The sulfides to be removed are usually H2S, SO2, COS, etc. Among them, H2S is the main one, and iron-based desulfurizers and manganese-based desulfurizers exist in the form of FeS and MnS after removing H2S. The solid waste is treated by pickling to produce H2S and SO2, and the elementa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B33/12C01F11/46C01B17/74
CPCC01B33/12C01F11/468C01B17/74C01P2006/80
Inventor 杨鹏田黎霞杨皓宋尉源
Owner 四川天人能源科技有限公司