Material for purifying arsenate and chromate in drinking water and preparation method and application thereof

A medium arsenate and chromate technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of complex preparation process, limitation, and high cost, and achieve large adsorption capacity and low production cost. low cost effect

Inactive Publication Date: 2010-06-09
HEFEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods have a certain adsorption effect on arsenic, but the preparation process is complicated and the cost is high. Many adsorbents for arsenic removal do not have the function of adsorbing and removing chromium at the same time, so their practical application is limited.

Method used

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  • Material for purifying arsenate and chromate in drinking water and preparation method and application thereof
  • Material for purifying arsenate and chromate in drinking water and preparation method and application thereof
  • Material for purifying arsenate and chromate in drinking water and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Select dense massive pyrrhotite ore from metal sulfide mines, wherein the content of pyrrhotite is not less than 90%, crush and sieve the pyrrhotite ore, and take the difference in particle size between 0.1 and 1.0mm Fill the filter column with granular particles, prepare simulated arsenic-containing and chromium-containing groundwater with tap water containing 1mg / L arsenic and 0.5mg / L chromium, and upflow the prepared arsenic-containing and chromium-containing water into the filter column, the hydraulic retention time For 1 hour, take out the filtered water regularly to detect the content of arsenic and chromium with atomic fluorescence and spectrophotometer respectively. After 70 days of filtering operation, the concentration of arsenic in the effluent is still lower than the standard A of the national drinking water on the content of arsenic, such as figure 1 shown; and the concentration of chromium in the effluent is still lower than the standard B for chromium cont...

Embodiment 2

[0031] Select dense massive pyrite ore from pyrite mines, where the content of pyrite is not less than 90%, crush and screen the pyrite ore, and take different particle sizes between 0.1 and 1.0mm Particles, 10 grams of particles are filled in a tube furnace, calcined at 500°C for 3 hours under the protection of nitrogen, and cooled to room temperature to obtain pyrrhotite particles prepared by calcining pyrite, and pyrrhotite particles prepared by calcining pyrite Fill the filter column with ore particles, and prepare simulated high-arsenic and chromium groundwater containing 1 mg / L arsenic and 0.5 mg / L chromium with tap water. The prepared water enters the filter column with an upflow, and the hydraulic retention time is 1 hour. The content of arsenic and chromium was detected by atomic fluorescence and spectrophotometer. After 70 days of filtration operation, the concentration of chromium and arsenic in the effluent was still lower than the national drinking water standard, ...

Embodiment 3

[0033]The pyrite concentrate powder is obtained by beneficiating metal sulfide mines, the particle size is less than 0.1mm, and the content of pyrite is not less than 90%. Add water glass according to the ratio of 3-10% by mass, prepare 2-4mm granules in a ball forming machine, fill the granules into a tube furnace, calcinate at 500°C for 3 hours under the protection of nitrogen, and cool to room temperature to obtain Pyrhotite particles prepared by calcining pyrite powder, and then the pyrrhotite particles prepared by calcining pyrite powder were packed into a filter column, and tap water was used to prepare simulated arsenic-containing, Chromium underground water, the prepared water enters the filter column with upflow, the hydraulic retention time is 1 hour, and the filtered water is taken regularly to detect the content of arsenic and chromium with atomic fluorescence and spectrophotometer respectively. After 70 days of filtration operation, the chromium and arsenic concent...

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Abstract

The invention relates to a material for purifying arsenate and chromate in drinking water and a preparation method and application thereof. The material is characterized in that: the material is sulfide of iron, manganese or zinc; the content of the sulfide in the material is not less than 50 weight percent; the content of arsenic is not more than 0.5 weight percent; and the concentration of the arsenate and the chromate in the drinking water is between 0.01 and 5 mg/L. The material for purifying the drinking water has the advantages of wide sources of raw materials, low cost and high adsorption activity, and capacity of being repeatedly used.

Description

technical field [0001] The invention relates to a mineral filter material for removing arsenate and chromate in water, its preparation method and application. Background technique [0002] Arsenic (As) is a ubiquitous and non-essential element with metalloid properties. The toxicity of arsenic is related to its chemical properties and valence. Because elemental arsenic is insoluble in water, it is almost not absorbed by organisms after ingestion and is completely excreted. It is generally harmless; organic arsenic, except for derivatives of arsine hydrogen, is generally less toxic; trivalent arsenic ions are the most toxic to cells. Especially arsenic trioxide, commonly known as letter stone, arsenic, etc., is the most toxic. Trivalent arsenic enters the human body and can combine with the sulfhydryl group of protein to form a specific conjugate, which hinders the respiration of cells and exhibits toxic effects. Trivalent arsenic also has a significant effect on mitochondri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/62C02F101/22C02F101/20
Inventor 陈天虎史亚丹王延明
Owner HEFEI UNIV OF TECH
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