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Method for treating waste carbide slag and waste hydrochloric acid

A technology of waste calcium carbide and waste hydrochloric acid, which is applied in chlorine/hydrogen chloride purification, calcium/strontium/barium halide, calcium/strontium/barium chloride, etc., to achieve effective comprehensive utilization, quality assurance, and good reaction effect

Inactive Publication Date: 2013-04-03
GUIZHOU KAILIN GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for processing waste carbide slag and waste hydrochloric acid, to solve the problem of comprehensive utilization of waste carbide slag and waste hydrochloric acid in the prior art

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  • Method for treating waste carbide slag and waste hydrochloric acid

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Effect test

Embodiment 1

[0023] Inject the waste calcium carbide slag and water into the activated carbon pretreatment device with a stirring device in a weight ratio of 1:1.8 and stir to form a uniform emulsion, settle naturally for 40 seconds, and send it to a filter press to obtain calcium hydroxide. The supernatant of the waste calcium carbide slag slurry is stored for later use; the waste hydrochloric acid is treated with activated carbon adsorption to obtain relatively pure hydrochloric acid. Take 400g of 25% hydrochloric acid in a 1000ml flask, slowly add 140g of carbide slag (calcium hydroxide) pretreated with activated carbon, dry and crushed, under stirring, control the reaction temperature at 90°C, and use 1% waste calcium carbide slag slurry as the supernatant liquid (calcium hydroxide solution) absorption. After the addition, the stirring reaction was continued until the pH value was 12, and then the stirring was stopped and filtered. Weigh 400g of filtrate, heat and concentrate on an el...

Embodiment 2

[0025] Inject the waste calcium carbide slag and water into the activated carbon pretreatment device with a stirring device in a weight ratio of 1:2 and stir to form a uniform emulsion, settle naturally for 50 seconds, and send it to a filter press to obtain calcium hydroxide. The supernatant of the waste calcium carbide slag slurry is stored for later use; the waste hydrochloric acid is treated with activated carbon adsorption to obtain relatively pure hydrochloric acid. Take 400g of 30% hydrochloric acid in a 1000ml flask, slowly add 150g of calcium carbide slag (calcium hydroxide) (water content 8%, dry basis calcium hydroxide content 80%, particle size less than 1mm) under stirring, add 3g of activated carbon simultaneously, and control the reaction temperature At 85°C, the generated waste gas is absorbed with 1% calcium hydroxide solution. After the addition, the stirring reaction was continued until the pH value was 12, and then the stirring was stopped and filtered. We...

Embodiment 3

[0027] Inject the waste calcium carbide slag and water into the activated carbon pretreatment device with a stirring device at a weight ratio of 1:2.2 and stir to form a uniform emulsion, settle naturally for 60 seconds, and send it to a filter press to obtain calcium hydroxide. The supernatant of the waste calcium carbide slag slurry is stored for later use; the waste hydrochloric acid is treated with activated carbon adsorption to obtain relatively pure hydrochloric acid. Take 300g of 30% hydrochloric acid in a 1000ml flask, slowly add 110g of calcium carbide slag (calcium hydroxide) (water content 8%, dry basis calcium hydroxide content 80%, particle size less than 1mm) under stirring, simultaneously add 3g of activated carbon, and control the reaction temperature At 80°C, the generated waste gas is absorbed with 1% calcium hydroxide solution. After the addition, the stirring reaction was continued until the pH value was 12, and then the stirring was stopped and filtered. ...

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Abstract

The invention discloses a method for treating waste carbide slag and waste hydrochloric acid. The method comprises the following steps: pouring waste carbide slag and water into an active carbon pretreatment device with a stirring device at a weight ratio to stir the waste carbide slag and the water into uniform emulsion; naturally settling the emulsion; feeding the settled product to a filter press to press and filter the settled product to obtain calcium hydroxide and storing the supernatant of the waste carbide slag slurry for further use at the same time; treating the waste hydrochloric acid by the adsorption of active carbon to obtain very pure hydrochloric acid; reacting the calcium hydroxide with the hydrochloric acid in a reactor according to pure mass; controlling the reaction temperature; absorbing the generated waste gas with the supernatant of the waste carbide slag slurry; adding the supernatant of the waste carbide slag slurry into the reaction liquid and stirring till the pH value is adjusted to 12; sucking and filtering the reaction liquid to obtain calcium chloride filter liquor and a filter cake; and finally, concentrating, distilling, centrifugally separating and drying the calcium chloride filter liquor to obtain calcium chloride. The method is low in cost, solves the problem of exhaust emission, is favorable for thorough reaction, ensures the quality of product and implements the effective comprehensive utilization of waste carbide slag and waste hydrochloric acid.

Description

technical field [0001] The invention relates to a method for treating waste carbide slag and waste hydrochloric acid. Background technique [0002] Carbide slag is the industrial waste of acetylene production plant, its composition is complex, besides calcium hydroxide, it also contains metal oxide or hydroxide, silicon dioxide and sulfide, phosphide. The acetylene production process is divided into dry acetylene and wet acetylene processes. The calcium carbide slag produced by different processes is different. The calcium carbide slag produced by the dry acetylene process has small particle size and low moisture content, but the content of sulfur and phosphorus is higher than that of wet acetylene. The process produces high carbide slag. Because the calcium carbide slag is produced in a large amount and has little use value, it is often used for landfill treatment, which not only occupies a large amount of land, but also pollutes soil and water sources. The waste hydrochl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B7/07C01F11/28
Inventor 梅桂宋聚铸唐兴兰施尚明陈旭
Owner GUIZHOU KAILIN GRP CO LTD
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