Material sorting method

A sorting, percentage technology, applied in the direction of analyzing materials, using wave/particle radiation for material analysis, sorting, etc., can solve problems such as water pollution

Active Publication Date: 2011-08-31
MINERAL SEPAREJSHN TECHZ INK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Some processes use acids to remove contaminants and contaminate water

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0045] Example 1: Linear Absorption Coefficient

[0046] Figure 7 Pyrite (FeS), coal, and silica (SiO 2 ) mass absorption coefficient (μ). Also their densities are shown. Note that coal is a mixture of carbon and hydrocarbons, and there is no NIST "standard" for coal. Thus, the X-ray absorption coefficient for coal is the NIST data for graphite corrected to a coal density of 1.2 grams per cubic centimeter (g / cc). As shown elsewhere herein, coal absorbs much less than pyrite among silicates for X-rays between 8 and 20 kiloelectron volts (KeV). use Figure 7 The information in shows how contaminants can be separated from coal.

Embodiment 2

[0047] Example 2: Percent X-ray transmission at different energies

[0048] The methods disclosed herein use x-ray energy that allows the selection of contaminants for removal while providing detectable transmission through the coal. As a first step, the size of the raw coal is reduced to less than 5 cm in order to provide significant transmission through the coal sample, while opaque contaminants such as sulfides and silicates pass through the X-ray transmission percentage of these materials. decrease to be detected. Figure 8The percent transmission calculated from the NIST absorption coefficient information is shown in .

[0049] Such as Figure 8 Best visible in medium, coal transmits X-ray energy extremely easily compared to what other materials allow. For example, it is calculated that the use of X-ray energy at the 15KeV level results in 56.6% transmission through coal with a thickness of 1 cm, whereas a contaminant with a thickness of only 1 mm has lower transmissio...

Embodiment 3

[0050] Example 3: Separation of Contaminants from Coal

[0051] The following method was performed on a 100 lb wet washed coal sample to separate contaminants from the coal. The samples were dried in the sun to remove moisture remaining from the wet washing step. After sun drying, the samples were reduced to individual pieces smaller than 10 cm in size. A sample was placed in an X-ray scanning device (Baggage Scanner Model No. 7555 commercially available from Smiths Detection, Danbury, CT). The X-ray apparatus is tuned to detect X-ray energies up to 160KeV. The transmission through each sample block was measured at two energy ranges. X-ray detectors receiving transmissions of X-ray energy are set such that transmissions through the coal correlate with transmissions at both energy ranges giving atomic numbers approximately less than 10. As noted in this application, these contaminants result in a reduced percent transmission of X-rays through the material, resulting in a hi...

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Abstract

Disclosed is a material sorting method, which processes ores by means of the difference of X-ray linear absorption coefficients and removes elements with high atomicity from elements with low atomicity. The method in a mine reduces pollution and transport cost. One embodiment of the invention is that impurities having sulfur, silicate, mercury, arsenic and radioactive elements are discharged from coal, which reduces the amount and toxicity of coal ashes, and reduces energy consumed by discharging and cleaning flue gas from coal combustion. The removal of discharge elements improves thermal efficiency and reduces pollution and carbon footmark of power generation.

Description

[0001] This application claims priority to US Patent Application Serial No. 12 / 712,343, filed February 25, 2010, entitled "Method of Reducing Coal Ash," the entire contents of which are incorporated herein by reference. [0002] We hereby inform that Charles E. Roos, a United States citizen of 2507 Ridgewood Drive, Nashville, TN 37215, and Edward J. Sommer, Jr., a United States citizen of 5329 General Forrest Court, Nashville, TN 37215, have invented novel and useful " Material Sorting Method". technical field [0003] The present application relates to the field of coal separation, in particular to a method for treating ore and removing elements with higher atomic number from elements with lower atomic number by utilizing the difference in linear absorption coefficient of X-rays. Background technique [0004] Natural coal is a mixture of carbon, hydrocarbons, moisture, and polluting minerals with higher atomic numbers. Coal generates half of U.S. electricity, but utilities...

Claims

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Application Information

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IPC IPC(8): B07C5/346
CPCB07C5/346G01N23/083
Inventor 查尔斯·E·鲁斯小爱德华·J·萨默
Owner MINERAL SEPAREJSHN TECHZ INK
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