Abstract: Salts of tetrathiocarbonic acid are produced by a process in which a hydroxide, sulfur, carbon disulfide and hydrogen sulfide are reacted continuously. The salts are produced as aqueous solutions having concentrations of about 15 to about 55 percent by weight.

Abstract: Salts of tetrathiocarbonic acid are produced by a batch process in which a hydroxide, hydrogen sulfide, sulfur and carbon disulfide are reacted sequentially. The salts are produced as aqueous solutions having concentrations of upwards of 30 percent by weight.

Abstract: Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polishes the geothermal brine by contacting the brine with a packing metal higher in the electromotive series than silver for a time sufficient for a precious metals to precipitate onto the packing at brine temperature and pH conditions which inhibit iron-rich silica scale. Most preferably, the contacting is accomplished near an injection well at the end of a heat extraction process and the packing comprises coiled zinc-galvanized steel chicken wire mesh packed in a sufficient density to also act as a filter for suspended particles. Alternatively, contacting is also accomplished near the production well. Dissolving the packing in a suitable acid leaves a precious metal-rich residue behind for subsequent recovery.

Abstract: Geothermal brine is passed through a zone containing a packing metal so as to reduce its tendency to deposit iron/silica scale, reduce corrosivity of the brine, and/or remove and recover metals from the brine. The method polished the geothermal brine by contacting the brine with a packing metal higher in the electromotive series than silver for a time sufficient for a precious metals to precipitate onto the packing at brine temperature and pH conditions which inhibit iron-rich silica scale. Most preferably, the contacting is accomplished near an injection well at the end of a heat extraction process and the packing comprises coiled zinc-galvanized steel chicken wire mesh packed in a sufficient density to also act as a filter for suspended particles. Alternatively, contacting is also accomplished near the production well. Dissolving the packing in a suitable acid leaves a precious metal-rich residue behind for subsequent recovery.

Abstract: In-stream suspended solids measurement in geothermal brine is accomplished by removal of suspended solids under process conditions followed by cooling using a detachable probe assembly. The cooling inhibits precipitation of added solids. By placing an in-stream filter at the sample entrance to immediately collect and remove suspended solids, pressure drop across the filter can be used to obtain real time suspended solids measurements. The filter may be composed of non-reactive/non-scaling materials and exposed for short durations to avoid additional chemical reaction and precipitation/scale at the filter. The detachable probe is attached to a valved access to the process stream allowing detachment and device weighing (instead of scale removal and weighing) to also provide suspended solids measurements.