Environment-friendly alkaline residue and sludge composite solidified soil with low chloride ion content
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An environmentally friendly technology with chloride ion content, applied in solid waste management, sustainable waste treatment, climate sustainability, etc., can solve the problems of low dissolved chloride ion content and environmental protection
Active Publication Date: 2020-07-14
JIANGSU NATURE WAY TECH
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[0005] In order to solve the above problems, the invention discloses a low chloride ion content environment-friendly alkali residue sludge composite solidified soil, which has the advantages of low dissolved chloride ion content and environmental protection, and the prepared composite solidified soil has a dissolved chloride ion content lower than The original tidal flat mud solves the problem of high concentration of dissolved chloride ions in alkali slag polluting the environment, realizes the resource utilization of alkali slag, reduces environmental pollution, and has obvious economic, social and environmental benefits
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Embodiment 1
[0032] The contents of each component of the solidified soil are: 40 parts of alkali slag, 60 parts of sludge, 0.4 part of anion exchanger, 0.3 part of wrapping agent, 0.5 part of water absorbing agent, 0.2 part of dispersant, 3 parts of cement, 4 parts of lime, and 3 parts of fly ash 2 parts, 2 parts of gypsum. After the alkali slag is solidified, the unconfined compressive strength of the solidified soil after standard curing for 28 days is 150kPa, and the performance of the solidified soil meets the needs of engineering backfill; - The content is 6000mg / kg, which is lower than the original tidal mud.
Embodiment 2
[0034]The contents of each component of the solidified soil are: 40 parts of alkali slag, 60 parts of sludge, 0.3 parts of anion exchanger, 0.3 part of wrapping agent, 0.3 part of water absorbing agent, 0.1 part of dispersant, 2 parts of cement, 3 parts of lime, and 2 parts of fly ash 1 part, 1 part gypsum. After the alkali slag is solidified, the unconfined compressive strength of the solidified soil after standard curing for 28 days is 160kPa, and the performance of the solidified soil meets the needs of engineering backfill; - The content is 8800mg / kg, which is lower than the original tidal mud.
Embodiment 3
[0036] The contents of each component of the solidified soil are: 40 parts of alkali slag, 60 parts of silt, 0.4 part of anion exchanger, 0.2 part of wrapping agent, 0.5 part of water absorbing agent, 0.1 part of dispersant, 3 parts of cement, 4 parts of lime, and 2 parts of fly ash 2 parts, 2 parts of gypsum. After the alkali slag is solidified, the unconfined compressive strength of the solidified soil after standard curing for 28 days is 155kPa, and the performance of the solidified soil meets the needs of engineering backfill; - The content is 8000mg / kg, which is lower than the original tidal mud.
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Abstract
The invention discloses environment-friendly alkaline residue and sludge composite solidified soil with low chloride ion content. The formula comprises the following components in parts by weight: 35-40 parts of alkaline residues, 55-60 parts of sludge, 0.3-0.4 parts of an anion exchanger, 0.2-0.3 parts of a wrapping agent, 0.3-0.5 parts of a water absorbent, 0.1-0.2 parts of a dispersing agent, 2-3 parts of cement, 3-4 parts of lime, 2-3 parts of fly ash and 1-2 parts of gypsum. According to the invention, 201X7 strongly basic anion resin is used as an anion exchanger; diammonium phosphate and diatomite are used as wrapping agents; alkali residues are used as an alkali activator of a curing agent; under the condition of certain unconfined compressive strength, the environment-friendly solidified soil with low chloride ion content is prepared, the content of dissolved chloride ions is lower than that of original mud flat sludge, the problem that the concentration of the dissolved chloride ions in the alkaline residues is high and pollutes the environment is solved, resource utilization of the alkaline residues is achieved, environmental pollution is reduced, and economic, social and environmental benefits are obvious.
Description
technical field [0001] The invention belongs to the technical field of civil engineering materials, and in particular relates to an environment-friendly alkaline slag silt composite solidified soil with low chloride ion content. Background technique [0002] The "ammonia-soda method" production process is used to produce soda ash. In the soda making process, raw materials such as calcium oxide and sodium oxide are prepared under certain process conditions to produce a large number of by-products, which are collectively called alkali slag, also known as alkali cement. The waste residue is mainly from the CaCl generated in the ammonia distillation process in the ammonia-soda production process. 2 , CaCO 3 and SiO brought by limestone 2 , CaCO 3 , and the unremoved small amount of impurities and their products brought by the original salt. For every 1 ton of soda ash produced, about 300kg of alkali slag is produced, and the amount of alkali slag produced is quite considerab...
Claims
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