34results about How to "Reduce the amount of sulfuric acid" patented technology

The invention discloses a method for preparing a biological flocculant by using biological iron-calcium slag in biological heap leaching. The biological iron-calcium slag produced in the process of low-grade copper ore hydrometallurgical biological heap leaching is used to reduce the iron content in the biological iron-calcium slag. Leaching and concentration include three main steps: (1) Iron-calcium pre-separation: mix biological iron-calcium slag and raffinate in proportion to obtain iron-rich raffinate, and then add limestone for neutralization to obtain biological iron-rich (2) Multi-stage countercurrent leaching: Through two-stage serial leaching tanks, the biological iron-rich slag is circulated and leached in the system; (3) Colloidal destabilization and separation: The mixed solution is destabilized by ultrasonic and high temperature to reduce viscosity, Then press filter to obtain the biological flocculant. The invention has low production cost, and the iron concentration in the leaching solution is greater than 100g / L, and can be used as a biological flocculant, which solves the problem of accumulation of biological iron-calcium slag in enterprises, reduces environmental risks and pressures, and simultaneously creates economic benefits for enterprises.

The invention relates to a production method of water-soluble monoammonium phosphate, which belongs to the technical field of clean processing and utilization of phosphate rock. A method for producing water-soluble monoammonium phosphate, comprising the following steps: a. mixing nitric acid and rock phosphate, reacting at 30-70°C for 0.5-2 hours, and separating solid and liquid to obtain an acidolysis solution; b. and until the pH is 6.5-8, solid-liquid separation, solid phase I and liquid phase I are obtained; c, solid phase I and sulfuric acid solution are mixed, 30-70 ° C for 0.3-2h, solid-liquid separation, solid phase II and Liquid phase II; neutralize the liquid phase II until the pH is 4.0-4.5, and then separate the solid and liquid to obtain solid phase III and liquid phase III; wherein, the liquid phase III is water-soluble monoammonium phosphate after processing. The method of the invention completely separates phosphorus and calcium in the phosphate rock, greatly improves the utilization rate of elements such as calcium and phosphorus, and can directly produce water-soluble monoammonium phosphate.

The invention relates to a method for producing 1, 5(1, 8)-binitro anthraquinone. The method comprises the following steps: putting anthraquinone in concentrated nitric acid, stirring and cooling the mixture, dripping sulphuric acid at a temperature of between 20 DEG C below zero and 15 DEG C, and making the mixture react for 2 hours continuously at the temperature of between 20 DEG C below zero and 15 DEG C after the dripping is finished, wherein the weight ratio of the concentrated nitric acid to the anthraquinone is between 5 to 1 and 30 to 1, and the weight ratio of the concentrated sulphuric acid to the anthraquinone is between 1 to 1 and 2 to 1; and then gradually heating the reaction mixture to between 60 and 65 DEG C, making the mixture react for 2 hours continuously, and finally adding the reaction mixture into cold water to separate out solid, filtering the solid, washing the solid by water and then drying the solid to obtain the binitro anthraquinone, wherein total content of 1,5-binitro anthraquinone and 1, 8-binitro anthraquinone is not lower than 88 percent. The method has the remarkable advantages that the method has normal-pressure reaction and simple process, canuse batch process and continuous method for production, and uses general chemical equipment, and uses little sulphuric acid, and reduces discharge of pollutant. The total content of the 1, 5(1, 8)-binitro anthraquinone in nitration reaction surpasses that of the prior advanced art.

The invention discloses an alcohol production method based on comprehensive utilization of waste water and belongs to the technical field of a waste water treatment and alcohol fermentation industry. The alcohol production method comprises carrying out one-step deamination treatment on an anaerobic digestion liquid, then carrying out solid-liquid separation to obtain an anaerobic clear liquid, and mixing the anaerobic clear liquid and a grain stillage clear liquid to obtain a liquid for material blending, wherein a ratio of the anaerobic clear liquid to the liquid for material blending is 60-99%. The one-step deamination treatment process comprises distilling an anaerobic digestion solution through water vapor in a distillation column with multiple layers of column plates or a filler, and removing a part of ammonia nitrogen and alkalinity of the anaerobic digestion solution through thermodynamic effects of water vapor. Through further deamination treatment on the anaerobic digestion solution, ammonia nitrogen accumulation in anaerobic digestion solution recycle is eliminated. The method has low energy consumption, less investment and simple operation, and is very suitable for industrial application.

The invention provides a process for primary desulfurization and secondary vanadium purification of roasted vanadium ores. The process takes sodium salts which do not contain chlorine ions as a roasting additive of vanadium ores and molds the vanadium ores; and the roasted sodium-containing vanadium ores are used for reclaiming SO2 gas generated in the roasting process at first, and diluted acid is used for immersion and vanadium purification. The maximum characteristic of the process is that the sodium-containing vanadium ores are taken as alkaline desulfurized substances and circulated intoa desulfurizing tower; Na<+> ions in the vanadium ores are recycled in the form of intermediate carriers; when the concentration of the Na<+> ions in a circulating absorption liquid reaches a certainvalue, the recovery rate of the SO2 gas generated in the roasting process can be improved and the amount of sulfuric acid in the procedure of immersion in the diluted acid and vanadium purification can be reduced; and sodium salt wastewater can be taken as the roasting additive of the vanadium ores instead of the sodium salts which do not contain the chlorine ions, so that the problem of severe environmental pollution of a large quantity of sodium salt wastewater and the SO2 gas produced in the conventional technological line is solved, and the process is a novel environment-friendly stone-like coal vanadium purification process having the advantages of utilization of waste materials to produce waste materials, high resource utilization rate, low production cost, small environmental pollution and even non pollution.

The invention provides a synthetic method for p-methyl phenyl serine ethyl ester. The method comprises the following steps: adding diethyl sulfate, ethanol, sulfuric acid and p-diphenylserine copper salt in a reaction vessel, performing a backflow reaction, monitoring the esterification conversion rate at 95-99% and completing the reaction; cooling the mother liquor after insulation and press filtration and crystallizing the material, performing pumping filtration after cooling to -5-0 DEG C, dissolving an obtained filter cake with water and removing copper by sodium sulfide, performing ammoniacal liquor analysis to obtain the product. The method has the advantages that average yield can reach 95%, product purity can reach more than 98%, waste water is little, and the method is environmentally friendly.

The invention discloses a method for extracting beryllium oxide from low-grade beryllium ore. The method is characterized by comprising the following steps of: grinding the low-grade beryllium ore, pelletizing, drying, roasting, and crushing to obtain a roasted material; adding concentrated sulfuric acid, stirring, leaching, and separating to obtain acidified liquid and acidified slag; adding theacidified liquid into the other roasted material, and stirring and leaching to obtain primary steep and primary leaching residue; adding concentrated sulfuric acid into the primary leaching residue, adding water, and stirring and leaching to obtain secondary steep and secondary leaching residue, wherein the acidified liquid is replaced by the secondary steep for recycling; extracting the primary steep by adopting an extracting agent in a volume ratio of phosphors extracting agents: alkanol: kerosene of (25-45):(5-1):(50-70) to obtain a beryllium-loaded organic phase and raffinate; washing theberyllium-loaded organic phase by adopting solution of oxalic acid, and performing back extraction by using solution of NaOH to obtain a blank organic phase and stripping solution; and regulating theconcentration of hydroxyl ions in the stripping solution to ensure that beryllium is hydrolyzed and precipitated, and calcining a precipitate to obtain the beryllium oxide. The method is easy to operate, the cost is low, the beryllium oxide with the content of over 97 percent is obtained, and the recovery rate of the beryllium is about 80 percent. The method is suitable for extracting the beryllium oxide from low-grade beryllium ore with low BeO content and high CaF2 content.