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A kind of method that utilizes citric acid slag to prepare composite cement retarder

A technology of citric acid slag and composite cement, applied in sustainable waste treatment, solid waste management, climate sustainability and other directions, can solve problems such as environmental pollution, property consumption, waste, etc., to reduce environmental pollution, realize reuse, Create simple effects

Active Publication Date: 2018-04-27
新化县天马水泥有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention: In view of the gradual shortage of traditional cement retarder gypsum resources, the discharge of chemical gypsum is very large, which pollutes the environment. The problem of consumption and waste, the present invention is by utilizing CaSO in the citric acid slag 4 2H 2 O, as a high-quality gypsum component, the mycelial suspension is obtained by cultivating Thiobacillus ferrooxidans, and the citric acid slag is treated to remove SO 3 and some heavy metals, and then mix it with sodium methyl silicate to modify the citric acid slag after microbial treatment to increase its ability to delay cement hydration, and then mix it with plant ash to obtain composite cement retarder

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0017] In parts by weight, take 40 parts of EMB agar medium, 15 parts of ferrous gluconate solution with a mass fraction of 5%, 12 parts of ammonium nitrate, 2 parts of dipotassium hydrogen phosphate and 1.2 parts of potassium dihydrogen phosphate, stir evenly to form For the mixture, use hydrochloric acid with a mass fraction of 30% to adjust the pH of the mixture to 2.5, and then put the mixture into a pressure steam sterilizer for sterilization to obtain a culture medium; inoculate Thiobacillus ferrooxidans to the above-mentioned culture medium according to the inoculum size of 10%. Then move the culture medium to a constant temperature shaker, culture at 150r / min, 28°C for 4 days, use deionized water with a flow rate of 3mL / min to wash the surface of the culture medium until there is no hyphae on the surface, collect the washing liquid, the mycelia suspension was treated; according to the solid-to-liquid ratio of 1:2, take the citric acid slag and the above-mentioned myceli...

example 2

[0020] In parts by weight, take 50 parts of EMB agar medium, 10 parts of ferrous gluconate solution with a mass fraction of 5%, 8 parts of ammonium nitrate, 1 part of dipotassium hydrogen phosphate and 0.8 part of potassium dihydrogen phosphate, stir evenly to form For the mixture, use hydrochloric acid with a mass fraction of 30% to adjust the pH of the mixture to 3.5, and then put the mixture into a pressure steam sterilizer for sterilization to obtain a culture medium; inoculate Thiobacillus ferrooxidans to the above-mentioned culture medium according to the inoculum size of 15%. Then move the culture medium to a constant temperature shaker, culture at 150r / min, 32°C for 5 days, use deionized water with a flow rate of 5mL / min to wash the surface of the culture medium until there is no hyphae on the surface, collect the washing liquid, the mycelia suspension was treated; according to the solid-to-liquid ratio of 1:2, the citric acid residue and the mycelia suspension obtained...

example 3

[0023]In parts by weight, take 48 parts of EMB agar medium, 12 parts of ferrous gluconate solution with a mass fraction of 5%, 10 parts of ammonium nitrate, 2 parts of dipotassium hydrogen phosphate and 1.0 part of potassium dihydrogen phosphate, stir evenly to form For the mixture, use hydrochloric acid with a mass fraction of 30% to adjust the pH of the mixture to 3.0, and then put the mixture into a pressure steam sterilizer for sterilization to obtain a culture medium; inoculate Thiobacillus ferrooxidans to the above-mentioned culture medium according to the inoculum size of 12%. Then move the culture medium to a constant temperature shaker, culture at 150r / min, 30°C for 5 days, use deionized water with a flow rate of 4mL / min to wash the surface of the culture medium until there is no hyphae on the surface, collect the washing liquid, the mycelia suspension was treated; according to the solid-to-liquid ratio of 1:2, the citric acid residue and the mycelia suspension obtaine...

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Abstract

The invention relates to a method for preparing a compound cement retarder from citric acid residues, belongs to the technical field of waste utilization and aims to solve the problems that gypsum resources of conventional cement retarders are increasingly scarce, the emission of chemical gypsum is large, the environment is polluted, large quantities of waste citric acid residues occupy a large area of land during stacking and transportation and huge consumption and waste of financial resources and materials are caused. CaSO4.2H2O in the citric acid residues is taken as a high-quality gypsum ingredient, a mycelium suspension is obtained by culturing ferrous oxide thiobacillus, the citric acid residues are treated, SO3 and part of heavy metals in the citric acid residues are removed, then the citric acid residues are mixed with methyl sodium silicate, the citric acid residues after microbiological treatment is modified, the cement hydration postponing capability is improved, the citric acid residues are mixed with plant ash and the like, and the compound cement retarder is prepared.

Description

technical field [0001] The invention relates to a method for preparing a composite cement retarder by using citric acid slag, and belongs to the technical field of waste utilization. Background technique [0002] Citric acid slag is the waste slag produced in the process of producing citric acid. After being treated by the filter press process, the water content is about 12%, and the fineness is relatively fine. Its shape is like mud, and it is white and loose, so it is also called calcium mud. a CaSO 4 2H 2 O is the main component of industrial waste, its SO 3 The content is as high as 42 to 48%. Usually, 2 to 3 tons of waste residue can be produced for every 1 ton of citric acid produced. The annual output of citric acid in my country exceeds 10 6 t, the annual output of waste residue exceeds 2×10 6 t. With the rapid development of my country's national economy, especially the chemical industry, the discharge of citric acid residues is increasing year by year. Gr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B22/12C04B18/18C04B103/22
CPCC04B18/18C04B40/0039C04B2103/22C04B18/101C04B22/124Y02W30/91
Inventor 陈克坚
Owner 新化县天马水泥有限公司