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Method for preparing high-efficiency fluorine removal agent from solid wastes

A technology for solid waste and fluoride removal agent, which is applied in chemical instruments and methods, water/sludge/sewage treatment, adsorbed water/sewage treatment, etc. Complex preparation process and other problems, to achieve the effect of simple preparation process, resource utilization, and rich sources

Inactive Publication Date: 2013-02-13
TIANJIN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the use of these adsorbents, there are problems such as expensive raw material sources, complicated preparation process, and great influence on the environmental pH value or initial fluorine concentration, which often affect the practical application of the adsorption method to a certain extent.

Method used

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  • Method for preparing high-efficiency fluorine removal agent from solid wastes

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Embodiment 1

[0023] A method for preparing a high-efficiency defluorinating agent by utilizing solid waste, the steps are as follows:

[0024] 1) Crush the discarded walnut shells into particles with a particle size of 1mm, wash with deionized water and remove impurities, dry at 105°C for 4 hours, and set aside;

[0025] 2) Crush egg shells into 0.1mm powder, add to acetic acid solution with a concentration of 25% by volume, the dosage ratio of egg shell powder and acetic acid solution is 1g / 20ml, carry out acid hydrolysis reaction at 100°C for 4 hours, and obtain soluble calcium solution;

[0026] 3) Immerse the walnut shell particles in the above soluble calcium solution for calcification treatment, the dosage ratio of walnut shell particles and soluble calcium solution is 1g:2mL, react at 20°C for 2.5h, dry at room temperature from 30°C to 10 The heating rate of ℃ / min is increased to 250℃, and oxidation pretreatment is carried out for 22 minutes;

[0027] 4) N ​​at a flow rate of 10ml...

Embodiment 2

[0031] A method for preparing a high-efficiency defluorinating agent by utilizing solid waste, the steps are as follows:

[0032] 1) Crush the waste walnut shells and peanut shells into 0.15mm particles, mix them at a mass ratio of 1:1, wash with deionized water and remove impurities, dry at 105°C for 3 hours, and set aside;

[0033] 2) Wash and dry the shrimp shells and crush them into 0.1mm powder, add them to the citric acid solution with a concentration of 30% by volume, the dosage ratio of the shrimp shell powder to the citric acid solution is 1g / 25ml, and carry out the acid treatment at 110°C Hydrolysis for 6 hours to obtain a soluble calcium solution;

[0034] 3) Immerse the biomass particles in the above soluble calcium solution for calcification, the ratio of biomass particles to soluble calcium solution is 1g:2mL, react at 40°C for 3h, dry at room temperature from 30°C to 5°C The heating rate per minute was raised to 250°C, and the oxidation pretreatment was carried...

Embodiment 3

[0038] A method for preparing a high-efficiency defluorinating agent by utilizing solid waste, the steps are as follows:

[0039] 1) Crush the waste chestnut shells into particles with a particle size of 0.5mm, wash with deionized water and remove impurities, dry at 105°C for 3 hours, and set aside;

[0040] 2) Wash, dry and crush the eggshell into 0.25mm powder, add it to the propionic acid solution with a concentration of 40% by volume, the ratio of eggshell powder to propionic acid solution is 1g / 10ml, and carry out acid hydrolysis at 90°C React for 7 hours to prepare a soluble calcium solution;

[0041]3) Soak the chestnut shell particles in the above soluble calcium solution for calcification, the ratio of the amount of chestnut shell particles to the soluble calcium solution is 1g:2mL, react at 20°C for 2.5h, and dry at room temperature from 25°C to The temperature rise rate is 10°C / min to 300°C, and oxidation pretreatment is carried out for 27.5 minutes;

[0042] 4) N...

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Abstract

A method for preparing a high-efficiency fluorine removal agent from solid wastes comprises the preparation steps as follows: pulverizing and drying of biomass raw materials, calcification modifying of the biomass, and carbonizing pretreatment and high-temperature anoxic carbonizing treatment of the biomass; the solid wastes comprise walnut shells, cocoanut shells, dead branches, peanut shells, chestnut shells, orange peel, shaddock peel, straw, waste edible fungi residues, egg and quail-egg shells with high calcium content, various waste conches and shrimp shells; and the high-efficiency fluorine removal agent can be used for high-efficiency fluorine removal of high-fluorine ground water or fluorine-containing industrial wastewater and environmental modification. The method provided by the invention has the advantages as follows: 1) the solid wastes are adopted as raw materials in the preparation of the high-efficiency fluorine removal agent and have abundant sources, so that the resource utilization of the solid wastes is realized; 2) the preparation process of the fluorine removal agent is simple, feasible in operation and environmental-friendly; and 3) the fluorine removal agent is highly efficient and environment-friendly, the fluorine removal effect can reach more than 98 percent, the regeneration is convenient, and the regeneration rate can reach 60-90 percent.

Description

technical field [0001] The invention relates to the preparation of a high-efficiency defluorinating agent, in particular to a method and application of using solid waste to prepare a high-efficiency defluorinating agent. Background technique [0002] Fluorine is one of the trace elements necessary for the normal growth of the human body, but excessive fluorine can lead to fluorosis, dental fluorosis and bone disease, damage to nerve and muscle tissue; hinder bone growth, resulting in bone deformation and limb disability. The World Health Organization drinking water standard stipulates that when the fluorine content exceeds 1.5mg / L, it is high fluoride water. my country's drinking water hygiene standards (GB5749-2006) stipulate that the concentration limit of fluoride ions in drinking water is 1.0mg / L. Groundwater is the main source of drinking water. According to the investigation of the Earth Disease Department of the Ministry of Health of my country, about 77 million peo...

Claims

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Application Information

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IPC IPC(8): B01J20/24B01J20/30C02F1/28C02F1/58
Inventor 张瑞玲
Owner TIANJIN UNIVERSITY OF TECHNOLOGY
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