Method for disposing industrial waste sulfuric acid by utilizing carbide slag

A technology of calcium carbide slag and waste sulfuric acid, applied in the direction of calcium/strontium/barium sulfate, etc., can solve the problems of complex process and no effective treatment of waste gas, and achieve the effect of simple process, reduction of waste treatment cost and pollution reduction.

Inactive Publication Date: 2016-06-08
河南开祥精细化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Not only the process is complicated (such as Chinese Patent Publication No. CN1884173, which requires more than a dozen processes), but also the waste gas in the reaction process is not effectively treated

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for treating industrial waste sulfuric acid by utilizing carbide slag, specifically:

[0024] 1) Take the waste sulfuric acid produced by purifying acetylene gas in the production process of 1,4-butanediol in a fine chemical enterprise as raw material. The waste sulfuric acid is a stable dark brown liquid with a slight odor; 2 SO 4 80%, 7% water, 13% organic matter and dust;

[0025] Take the calcium carbide slurry discharged from the acetylene generating device of a chlor-alkali enterprise as raw material, and use GB / T2793-1995 to measure its solid content. The measurement temperature is 105±2°C, the time is 180±5min, and the sampling volume is 1.0 g. The solid content is 15%. According to the standard GB176-1987 of the People's Republic of China (Cement Chemical Analysis Method), among them, calcium oxide is 69.52%, silicon dioxide is 3.17%, aluminum oxide is 2.95%, iron oxide is 0.92%, magnesium oxide is 0.74%, sulfur oxide is 0.81%. Lost 19.56%;

[0026...

Embodiment 2

[0029] A method for treating industrial waste sulfuric acid by utilizing carbide slag, specifically:

[0030] 1) Take the waste sulfuric acid produced by drying hydrogen chloride gas in a chlor-alkali enterprise as raw material, the waste sulfuric acid is a stable light brown liquid; 2 SO 4 83%, water 14% and other 3% composition;

[0031] Take calcium carbide slag from a dry process of a 1,4-butanediol production enterprise as raw material, gray solid powder, analyze according to the standard GB176-1987 of the People's Republic of China (cement chemical analysis method), of which calcium oxide is 64.43%, silicon dioxide 6.31%, alumina 2.01%, iron oxide 1.28%, magnesium oxide 1.36%, sulfur oxide 0.54%, loss on ignition 22.53%;

[0032] 2) Stir and mix carbide slag and water evenly in a mixing tank to obtain a suspension of carbide slag with a solid content of 35%. Then use an anti-alkali pump to send the calcium carbide slag suspension to a neutralization tank with a water ...

Embodiment 3

[0035] A method for treating industrial waste sulfuric acid by utilizing carbide slag, specifically:

[0036] 1) Take the waste sulfuric acid produced by a chlor-alkali enterprise to purify acetylene gas as raw material. The waste sulfuric acid is a stable dark brown liquid with a pungent and unpleasant odor, low viscosity and free flow; 2 SO 4 88%, 6% water, 6% organic matter and dust;

[0037] The calcium carbide slag slurry discharged from the calcium carbide slag settling tank of a chlor-alkali enterprise is used as raw material, and its solid content is measured by GB / T2793-1995. The measured solids content was 28%. According to the standard GB176-1987 of the People's Republic of China (Cement Chemical Analysis Method), among them, calcium oxide is 63.52%, silicon dioxide is 3.17%, aluminum oxide is 1.95%, iron oxide is 1.92%, magnesium oxide is 0.74%, sulfur oxide is 0.41%. Lost 17.93%;

[0038] 2) Store the calcium carbide slurry directly in a sealed mixing tank wit...

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PUM

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Abstract

The invention relates to a method for disposing industrial waste sulfuric acid by utilizing carbide slag. The method comprises the following steps: evenly mixing the carbide slag with water in an airtight mixing tank to obtain a carbide slag suspension of which the solid content is 15 wt% (weight percentage) to 35 wt%; then, delivering the carbide slag suspension into a neutralizing tank; adding the waste sulfuric acid into the neutralizing tank under stirring until the pH (Potential Of Hydrogen) of a system in the neutralizing tank is 7 to 9; then, delivering a mixture to a filter press for solid-liquid separation; returning filtrate to the airtight mixing tank for recycling, wherein a filter cake is water-contained calcium sulfate. The method disclosed by the invention is greatly simplified in production flow, very simple in process, easy to operate and low in energy consumption; meanwhile, after two kinds of industrial waste are disposed, the filtrate returns to the system for reuse; the water-contained calcium sulfate filter cake can be directly used as a raw material for producing cement and gypsum, and can also be used directly used for paving and the like, and no secondary pollutants are generated.

Description

technical field [0001] The invention belongs to the technical field of three wastes treatment and comprehensive utilization, and in particular relates to a method for treating industrial waste sulfuric acid with carbide slag. Background technique [0002] Waste sulfuric acid is a waste liquid produced by many industrial processes. The concentration of these waste sulfuric acids varies, and the concentration of many waste sulfuric acids is above 80%. For example, sulfuric acid is used as an adsorption and purification agent for acetylene gas in the process of hydrolysis of calcium carbide to produce acetylene and natural gas cracking to produce acetylene, to purify the acetylene gas produced by calcium carbide, so as to facilitate the reaction in the subsequent alkyne aldehyde condensation section. 1 ton of calcium carbide consumes about 17 kg of sulfuric acid and produces about 20-22 kg of waste sulfuric acid with a concentration of 80-86%. In the chlor-alkali industry, sul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01F11/46
CPCC01F11/46
Inventor 曹敏程相龙杨勇李建立郭晋菊赵小玲董文博江雯侯萌萌和进伟张彦军马斌
Owner 河南开祥精细化工有限公司
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