1987-01-08_REVISION - M1977493 - Laserfiche WebLink

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6 6. Pamak WTP--a wax, tar, and pitch product--was an effective stabiliz- ing agent at $250 per acre. 7. Petroset SB-1--an elastomeric polymer--was an effective stabilizer at $250 per acre, 8, Potassium silicate, having an SiOy to K20 ratio of 2.5, was an effec- tive stabilizer where applied at costs of $450 to $950 per acre. 9. PB-4601--a polymeric stabilizing agent--was an effective stabilizing agent at a cost of $500 per acre. .~ 10, A cationic neoprene emulsion and Rezosol, an elastomeric polymer, were effective stabilizers at a cost of about $500 per acre. 11, Dresinol--TC 1843--an ammonium casein of tall oil pitch, was an effec tive stabilizer at $500 per acre. 12, 'Sodium silicates, having ratios of 2.4 to 2.9 SiOa to 1 NazO, were effective stabilizers when applied in quantities costing about $200 per acre, Calcium chloride was an effective additive to the sodium silicate and per- mitted a reduction in the quantities of sodium silicate needed foi effective stabilization, Chemical Field Trial Chemicals were tested in the laboratory for possible application on ura- nium tailings at Tuba City, Ariz. Vegetative procedures were deemed unsuit- r able at Tuba City because the annual precipitation is only 6.5 inches, and S also because one section of dike of pond tailings is highly. alkaline (pH 9.3) ~ and another section is highly acid (pH 2,3). Physical stabilization using ~ country rock and soil coverings was considered too costly. The chemicals selected from laboratory testing for field use included DCA-70, an elastomeric i polymer produced by Union Carbide Co., for use on all the dike tailings, both ~ acidic and basic, and calcium lignosulfonate for use on all pond tailings, • both acidic and basic. A 34,5-acre tract of Tuba City tailings was stabilized by Bureau of Mines personnel in May 1968, with the two selected chemicals. These were applied using a lightweight sprinkling device called a Rain Train to cheaply distrib- ute the chemicals on the unstable surface, The dikes comprising an area of about 6.5 acres were stabilized with 1,500 gallons of DCA-70 applied at a solution strength of 4 percent at a cost of 10 cents per square yard. Sixty- three tons of calcium lignosulfonate was applied to the beach area of about 28 acres at the rate of 1.05 pounds per square yard, The average stabiliza- tion cost was $335 per acre, The tailings were inspected in May 1969, March 1970, and July 1972. The 1969 inspection showed about 10 percent disruption of the dike surface, prin- cipally where overhanging projections on the dikes had not been leveled off prior to treatment, and wind could secure purchase beneath sections of crust.