3results about How to "No output" patented technology

The invention belongs to the technical field of nonferrous smelting, and relates to a method for separating lead bullion and copper matte and producing low-arsenic copper matte in a bottom blowing smelting furnace. The method comprises the following steps: continuously and quantitatively adding the high-arsenic copper dross into a bottom blowing smelting furnace for oxidation smelting, introducing natural gas and oxygen into a bottom oxygen lance, keeping a low-temperature oxidizing atmosphere in the furnace, and producing a three-phase melt layer of lead bullion, low-arsenic copper matte and high-lead dross; produced lead bullion is discharged through a siphon channel; and the produced low-arsenic matte is discharged through a matte opening, and high-lead slag is discharged through a slag opening. According to the method, the problems that crude lead and matte are difficult to separate and high-arsenic matte is produced in the traditional copper scum bottom blowing reduction smelting process are solved, the content of As in the produced matte is smaller than 0.5%, and high-quality crude copper can be produced through subsequent further treatment. And meanwhile, the energy consumption is low, the cost is low, large-scale production is achieved, the industrial advantage is more obvious, the comprehensive yield of copper is 99% or above, and the removal rate of arsenic in copper is 95% or above.

The invention provides a method for extracting maleic acid monosalt crystals by using maleate production wastewater, and relates to the technical field of wastewater treatment.The maleate production wastewater is hydrolyzed in alkali metal hydroxide, maleate in the wastewater is converted into maleate disalt, the maleate disalt reacts with maleic anhydride to generate maleic acid monosalt, and the maleate monosalt is separated out. Sodium carbonate is continuously added into the filtrate in which the maleic acid monosalt is collected, and the filtrate can be continuously used for an alkali washing process in maleic ester production. Therefore, the method provided by the invention realizes the extraction of effective substances in the maleate production wastewater and the cyclic utilization of the waste liquid, has no wastewater discharge, is high in operability, and has important practical application value.

This invention discloses a method for purifying silica from quartz minerals, comprising the following steps: Step 1) Adding hydroxide to a quartz mineral slurry to obtain an aluminum removal reaction slurry, wherein the OH in the aluminum removal reaction slurry... ‑ The concentration is 0.02-0.5 mol / L; the aluminum removal reaction slurry is heated to 50-120℃ under closed conditions and stirred for 0.5-12 h. After the reaction, solid-liquid separation is performed to obtain aluminum-removed quartz mineral; step 2) a high-alkali enhanced oxidant solution is added to the aluminum-removed quartz mineral to obtain an iron removal reaction slurry, wherein the high-alkali enhanced oxidant contains peroxide, carbonate and hydroxide, and the OH- concentration in the iron removal reaction slurry is 0.5-10.0 mol / L; the iron removal reaction slurry is heated to 120-200℃ under closed conditions and stirred for 0.5-2 h, and then heated to 200-280℃ under closed conditions and stirred for 0.1-1 h. After the reaction, solid-liquid separation is performed to obtain purified silica.