Photograph of the area around the Eagle-Pichers Mine, Picher, Oklahoma. Slimes Pond Evaluation of plantings in Commerce, Oklahoma. View facing north in central portion of Field no. 6. Black Locust trees planted on 02-03-1967 without fertilizer nor mulch. OK-2878-26.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing north in Field no. 1. Native grass plantings seeded into prairie hay mulch. View, and Raymond Magness, is near the center of the plot. OK-2879-15.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing north in field no. 3, near the center of the field. Raymond Magness holds the rod by the sycamore tree planted on 02-03-1967. No ferilizer used, but prairie hay mulch used. OK-2879-16.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing northwest in fertilized and mulched portion of Field no. 5. Shows growth of volunteer cottonwood trees in area planted to native grasses. Grass planted and fertilizer applied in prairie hay mulch on MArch 15 - 16, 1967. OK-2879-2.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing northwest in mulched border north of Field no. 3. Seeded to a mixture of weeping and sand love grass and mixed bluestem. Seeded on 03-15-1967 and fertilized with 400 pounds of 10-20-10. OK-2879-12.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing west in Field No. 4, series 5. English rye grass was seeded on 09-19-1966 unmulched and fertilized at the rate of [unclear]. with rows using either 200 pounds of 10-20-10 fertilizer or 400 pounds of the same. The Road is held by Raymond Magness in the 400 pound row. OK-2878-5.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing west in Field no. 2, series 9, haygrazer planted on 05-12-1967 unmulched. 2 check rows without fertilizers, 2 rows with 200 pounds of 10-20-16 fertilizer, 2 rows with 400 pounds of 10-20-10 with 50% nitrogen top dressed on the eastern half. Raymond Magnass holds the pole upright between rows 3 & 4--top dressed on 06-24-1967. OK-2879-20.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing northwest in Field no. 4, series 6. German millet planted on 05-12-1967. Rows 1 and 2 were not fertilized. Rows 3 and 4 were with 200 pounds of 10-20-10 fertilizer. Rows 5 and 6 were fertilized using 400 pounds of 10-20-10 fertilizer and 150 pounds of 33-0-0 at the east end. Rows 7 and 8 used 200 pounds of 10-20-10 fertilizer and 150 pounds of 33-0-0. Raymond Magness in the photo. OK-2879-4.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing west toward Field no. 2, series 10. Planted sumac. The check rows are unfertilized; 2 rows are fertilized with 200 pounds of 10-20-10 fertilizer; 2 rows with 400 pounds of 10-20-10; 2 rows with 200 pounds of 10-20-10 fertilizer and 50 pounds of nitrogen top-dressed; and, 2 rows with 400 pounds of 10-20-10 fertilizer and 50 pounds of nitrogen top-dressed. Seeded on 05-12-1967; top-dressed on 06-24-1967, unmulched. OK-2879-11.

Photograph of the area around the Eagle-Pichers Mine, with slimes pond evaluation of plantings in Picher, Oklahoma. View facing west in Field no. 2, series 6, with broom corn, the summer cover crop planted on 05-12-1967. Unmulched. 2 check rowws without fertilizer, 2 rows with 200 pounds of 10-20-10 fertilizer, 2 rows with 400 pounds of 10-20-10, 2 rows of 10-20-10 fertilizer with 50% nitrogen top-dressed and 2 rows with 400 pounds of 10-20-10 fertilizer with 50% fertilizer top-dressed. Raymond Magness holds the rod between rows 4 and five. OK-2879-7.

The goal of this project is to improve energy efficiency of industrial crushing and grinding operations (comminution). Mathematical models of the comminution process are being used to study methods for optimizing the product size distribution, so that the amount of excessively fine material produced can be minimized. The goal is to save energy by reducing the amount of material that is ground below the target size, while simultaneously reducing the quantity of materials wasted as ''slimes'' that are too fine to be useful. This is being accomplished by mathematical modeling of the grinding circuits to determine how to correct this problem. The approaches taken included (1) Modeling of the circuit to determine process bottlenecks that restrict flow rates in one area while forcing other parts of the circuit to overgrind the material; (2) Modeling of hydrocyclones to determine the mechanisms responsible for retaining fine, high-density particles in the circuit until they are overground, and improving existing models to accurately account for this behavior; and (3) Evaluation of advanced technologies to improve comminution efficiency and produce sharper product size distributions with less overgrinding.

None

The objectives of this project were to test and demonstrate the feasibility of recovering coal fines that are currently disposed of with coal preparation plant effluent streams and producing a fine clean coal product that can be blended with the plant coarse clean coal. This recovery was effected by means of Michigan Technological University`s static tube flotation process, which was successfully demonstrated on a number of raw coals to reject 85% of the pyritic sulfur and recover 90% of the combustible matter. Under this project, the process parameters for the technology were modified for this application in order to recover a low-ash, low-sulfur clean coal that is, at a minimum, compatible with the quality of the clean coal currently produced by the preparation plant.

The report consists of the vugraphs from the presentations which covered the following topics: Summaries of the US Department of Energy`s coal preparation research programs; Preparation trends in Russia; South African coal preparation developments; Trends in hard coal preparation in Germany; Application of coal preparation technology to oil sands extraction; Developments in coal preparation in China; and Coal preparation in Australia.

This document contains primarily reproductions of slides presented at the 1986 Annual Doe Remedial Action Programs Meeting, Oak Ridge, Tennessee.

A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.

A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.

A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.

Ford, Bacon and Davis Utah Inc. has performed an engineering assessment of the problems resulting from the existence of radioactive uranium mill tailings at the Monument Valley millsite in Arizona. The Phase II, Title I services include the preparation of topographic maps, the performance of core drillings and radiometric measurements sufficient to determine areas and volumes of tailings and other radium-contaminated materials, the evaluation of resulting radiation exposures of individuals residing nearby, the investigation of site hydrology and meteorology and the evaluation and costing of alternative corrective actions. Radon gas release from the tailings on the site constitutes the most significant environmental impact, although windblown tailings and external gamma radiation are also factors. The sparse population and relatively low radiation levels yield minimal immediate environmental impact; hence, the two alternative actions presented are directed towards restricting access to the site (Options I and II), and returning the windblown tailings to the pile and stabilizing the pile with 2 ft of cover material (Option II). Both options include remedial action costs for offsite locations where tailings have been placed. Cost estimates for the two options are $585,000 and $1,165,000. Reprocessing the tailings for uranium is not economically feasible.

Ion exchange is used in nearly every part of the nuclear fuel cycle -- from the purification of uranium from its ore to the final recovery of uranium and transmutation products. Ion exchange also plays a valuable role in the management of nuclear wastes generated in the fuel cycle.

Ford, Bacon and Davis Utah Inc. has performed an engineering assessment of the problems resulting from the existence of radioactive uranium mill tailings at Shiprock, New Mexico. The Phase II, Title I services include the preparation of topographic maps, the performance of core drillings and radiometric measurements sufficient to determine areas and volumes of tailings and other radium-contaminated materials, the evaluation of resulting radiation exposures of individuals and nearby populations, the investigation of site hydrology and meteorology and the evaluation and costing of alternative corrective actions. Radon gas release from the 1.7 million tons of tailings at the Shiprock site constitutes the most significant environmental impact, although windblown tailings and external gamma radiation are also factors. The 11 alternative actions presented range from completion of the present ongoing EPA site decontamination plan (Option I), to stabilizing in-place with varying depths of cover material (Options II-IV), to removal to an isolated long-term disposal site (Options V-XI). All options include remedial action costs for off-site locations where tailings have been placed. Costs estimates for the 11 options range from $540,000 to $12,500,000. Reprocessing the tailings for uranium is not economically feasible.

An engineering assessment was made of the problems resulting from the existence of radioactive uranium mill tailings at the Monument Valley millsite in Arizona. The Phase II, Title I services include the preparation of topographic maps, the performance of core drillings and radiometric measurements sufficient to determine areas and volumes of tailings and other radium-contaminated materials, the evaluation of resulting radiation exposures of individuals residing nearby, the investigation of site hydrology and meteorology and the evaluation and costing of alternative corrective actions. Radon gas release from the tailings on the site constitutes the most significant environmental impact, although windblown tailings and external gamma radiation are also factors. The sparse population and relatively low radiation levels yield minimal immediate environmental impact; hence, the two alternative actions presented are directed towards restricting access to the site and returning the windblown tailings to the pile and stabilizing the pile. Both options include remedial action costs for offsite locations where tailings have been placed. Cost estimates for the two options are $585,000 and $1,165,000.

A weekly student newspaper from the Rice Institute in Houston, Texas that includes campus news and commentaries along with advertising.

Column flotation provides excellent recovery of ultrafine coal while producing low ash content concentrates. However, column flotation is not efficient for treating fine coal containing significant amounts of mixed-phase particles. Fortunately, enhanced gravity separation has proved to have the ability to treat the mixed-phased particles more effectively. A disadvantage of gravity separation is that ultrafine clay particles are not easily rejected. Thus, a combination of these two technologies may provide a circuit that maximizes both the ash and sulfur rejection that can be achieved by physical coal cleaning while maintaining a high energy recovery. This project is studying the potential of using different combinations of gravity separators, i.e., a Floatex hydrosizer and a Falcon Concentrator, and a proven flotation column, which will be selected based on previous studies by the principle investigator. During this reporting period, an extensive separation performance comparison between a pilot-scale Floatex Density Separator (18{times}18-inch) and an existing spiral circuit has been conducted at Kerf-McGee Coal Preparation plan for the treatment of nominally {minus}16 mesh coal. The results indicate that the Floatex is a more efficient separation device (E{sub p}=0.12) than a conventional coal spiral (E{sub p}=0.18) for Illinois seam coals. In addition, the treatment of {minus}100 …