4 results about "Sulfite" patented technology

The invention discloses anti-corrosion concrete applied to a sulfate bittern environment as well as a preparation and construction technology thereof. The concrete comprises the following raw materials: light calcined magnesia, magnesium sulfate, water, aggregate, a mineral admixture and an additive. Through mutual effect among the components of the concrete and with the sulfate bittern environment with specific salt type and concentration, the concrete can be condensed and hardened, generated, developed and strength-maintained in sulfate saline soil, sulfite saline oil or bittern environment in a wet state with specific salt type and concentration or below the underground water level. The concrete disclosed by the invention is applied to the sulfate bittern environment and can meet the requirements of concrete strength and durability of structures and components.

The invention relates to a cyanide-free Au-Sn alloy plating solution, a preparing method thereof and a method for conducting plating through the cyanide-free Au-Sn alloy plating solution, and belongs to the field of plating. The cyanide-free Au-Sn alloy plating solution comprises following raw materials and components including 0.01 mol/L-0.08 mol/L of gold ions, 0.02 mol/L-0.24 mol/L of stannous ions, 0.12 mol/L-2.40 mol/L of a stannous ion complex agent, 0.08 mol/L-1.50 mol/L of hydantoin and derivatives of the hydantoin, 0.06 mol/L-2.00 mol/L of sulfite, 0.01 mol/L-0.30 mol/L of a stabilizer and 0.02 mol/L-0.06 mol/L of a stannous ion antioxidant. The cyanide-free Au-Sn alloy plating solution has the beneficial effects that stability is high, components of a plating layer are controllable, the preparing method is simple and convenient, operation is easy, and waste liquid is easy to recycle. The plating solution can be preserved for a long term (two or more months) at the room temperature and therefore the cyanide-free Au-Sn alloy plating solution is expected to be applied to actual production.

Methods for extracting metalloid and metal species from a solid or liquid material by exposing the material to a fluid solvent, particularly supercritical CO2, and a chelating agent are described. The chelating agent forms a chelate with the species, the chelate being soluble in the fluid to allow removal of the species from the material. In preferred embodiments the extraction solvent is supercritical CO2 and the chelating agent comprises an organophosphorous chelating agent, particularly sulfur-containing organophosphorous chelating agents, including mixtures of chelating agents. Examples of chelating agents include monothiophosphinic acid, di-thiophosphinic acid, phosphine sulfite, phosphorothioic acid, and mixtures thereof. The method provides an environmentally benign process for removing metal and metalloids from industrial waste solutions, particularly acidic solutions. Both the chelate and the supercritical fluid can be regenerated and the contaminant species recovered to provide an economic, efficient process.

The invention discloses a method for producing a high-sulfur petroleum coke slurry additive, which comprises the following steps: uniformly mixing sodium lignin sulfonate, sodium dodecyl benzene sulfonate, a sodium naphthalene sulfonate formaldehyde high-molecular polymer, ethylene glycol and water, and heating; adding carboxymethyl cellulose and sodium hydrogen sulfite, and stirring to obtain a petroleum coke slurry additive; the method can obviously improve the concentration of the petroleum coke slurry, reduce the bleeding rate, improve the stability and efficiently utilize the petroleum coke in an environment-friendly manner, is suitable for gasification or incineration of the petroleum coke, and has creative significance in efficient utilization of the high-sulfur petroleum coke.