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A preparation method of defluoridation material based on crop straw and magnesium smelting waste

A crop straw and waste technology, applied in chemical instruments and methods, water/sludge/sewage treatment, adsorption water/sewage treatment, etc., can solve the problems of high treatment cost, multiple resources, large amount of defluoridation agent, etc. Achieve the effects of rich and easy-to-obtain raw materials, simple preparation process, and large fluorine adsorption capacity

Inactive Publication Date: 2017-03-22
北京绿洁美科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these technologies have a positive effect in reducing the fluorine content in water, there are still problems such as high treatment costs, the consumption of more resources for the preparation of defluoridation agents, the large amount of defluoridation agents, secondary pollution, and the treatment of water bodies with different pH values. There are no defects in universality and other aspects
Patents CN102259946A, CN102357357A and CN104324684A can all obtain good defluorination effect, but the raw materials containing Ti, Zr, Ce and other elements are used, resulting in high cost of these defluoridation materials, and they are only suitable for treating neutral water; patent CN1966407A published A method for removing fluorine from an acidic zinc electrolyte with aluminum salt and phosphate, but this method has resulted in a considerable loss of the valuable element zinc in the electrolyte
[0004] On the other hand, the main process used to smelt metal magnesium in my country is the silicothermal method, and the current process produces a large amount of CO 2 Most of the exhaust gas is directly discharged into the atmosphere without treatment, and a large amount of solid waste such as waste calcined white, dust and reduction slag is also seriously polluted the environment.
At the same time, my country is still a country rich in biomass resources, and a large amount of biomass waste including crop straws produced every year has not been effectively utilized

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0061] Example 1 Preparation of neutral water body defluoridation material and its defluoridation effect

[0062] Preparation of the fluoride removal material in this embodiment

[0063] Step 1: Preparation of Biomass Binder

[0064] After immersing straws with an average size of ≤3 mm in water 8 to 10 times the mass of the straws for 1 day, add slaked lime equivalent to 35% of the mass of the straws, stir evenly, and then heat to 100°C and keep it warm for 4 hours to obtain a yellow viscous substance. Add phosphoric acid accounting for 10% of its volume to the yellow viscous substance, and stir evenly to obtain a biomass binder;

[0065] The second step: Digestion and carbonation of solid waste generated in the silicon thermal magnesium smelting process

[0066] First, the waste calcined white, magnesium reduction slag and dust generated during the calcination process are crushed to below 200 mesh, and the crushed material is added to water for digestion according to the li...

Embodiment 2

[0077] Example 2 Preparation of materials for zinc electrolyte defluorination and its defluorination effect

[0078] Preparation of the fluoride removal material in this embodiment

[0079] Step 1: Preparation of Biomass Binder

[0080] Soak straws with an average size of ≤3mm in water 8-10 times the mass of the straws for 3 days, add slaked lime equivalent to 35% of the mass of the straws, stir evenly, then heat to 95-100°C and keep it warm for 4 hours to obtain a yellow viscous substance , add phosphoric acid accounting for 20% of its volume to the yellow viscous substance, and stir evenly to obtain a biomass binder;

[0081] The second step: Digestion and carbonation of solid waste generated in the silicon thermal magnesium smelting process

[0082] First, the waste calcined white, magnesium reduction slag and dust generated during the calcination process are crushed to below 200 mesh, and the crushed material is added to water for digestion according to the liquid-solid ...

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Abstract

The invention discloses a preparation method of a defluorination material based on crop straws and magnesium making wastes. The magnesium making wastes comprise carbon dioxide exhaust gas generated in a silicothermic process magnesium making flow, and solid wastes containing calcined dolomite wastes, magnesium reducing slag and dusts. The preparation method comprises the following steps: preparing a biomass binder from the crop straws, digesting the solid wastes generated in the silicothermic process magnesium making flow, carbonating a digestion slurry, carrying out thermal decomposition and batch mixing on the carbonated slurry, and carrying out molding high temperature heat treatment. The defluorination material can efficiently remove fluorine in general industrial wastewater and nonferrous metal electrodeposition electrolytes, realizes control of harms through using wastes, and makes the crop straws and the silicothermic process magnesium making wastes become a main raw material for control fluorine harms.

Description

technical field [0001] The present invention relates to the recycling technology of waste gas and waste residue produced by crop straw and thermal magnesium smelting process, and specifically relates to a method for preparing a defluoridation material based on crop straw and magnesium smelting waste. The defluoride material can efficiently remove general industrial wastewater Fluorine in the electrolyte for electrodeposition of non-ferrous metals. The invention belongs to the technical field of water treatment material preparation. Background technique [0002] Fluorine-containing wastewater in my country has the characteristics of complex composition, large water volume, and wide distribution. Fluoride-containing wastewater mainly comes from fluorine chemical industry, steel production, aluminum electrolysis and aluminum processing, acid production and sulfide-containing fertilizer production, glass product manufacturing and processing, Non-ferrous metal smelting and other ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B01J20/20B01J20/30C02F1/28C02F1/58
Inventor 周向清张志敏
Owner 北京绿洁美科技有限公司
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