5results about How to "PH drop" patented technology

This invention relates to the field of flue gas treatment technology, specifically to a sulfur dioxide gas absorbent, comprising the following raw materials by weight: 90-100 parts of an aqueous amine solution and 2-6 parts of additives. In this invention, the nitrogen-zinc ion-sulfur active center of the catalyst acts as a molecular key, efficiently and reversibly coordinating and activating sulfur dioxide molecules, significantly reducing the reaction energy barrier and fundamentally improving the intrinsic absorption rate. The enhancer, with its high specific surface area, provides a large interface for the reaction. Its surface sulfonic acid groups not only buffer the decrease in system pH, maintaining the optimal acid-base environment for the reaction, but also catalyze the conversion of absorption intermediates into more stable products, thereby shifting the reaction equilibrium to the right. Under the combined effect of these two factors, the catalyst accelerates the reaction towards equilibrium, while the enhancer continuously shifts the equilibrium point, resulting in a higher absorption capacity for the absorbent.

The invention belongs to the technical field of organic fertilizers, and particularly relates to a straw-based biochar composite slow-release fertilizer for saline-alkali soil improvement and a preparation method of the straw-based biochar composite slow-release fertilizer. The preparation method comprises the following steps: (1) uniformly mixing sheep manure and pigeon manure, mixing the mixed manure with crushed corn straw to obtain a total material, inoculating bacillus subtilis, and composting and fermenting to obtain a primary organic matter; (2) fermenting the primary organic matter by using aspergillus niger, trichoderma reesei and saccharomyces cerevisiae to obtain a submerged fermentation organic matter; (3) crushing the submerged fermentation organic matter to prepare particles; the composite coating powder is scattered into the submerged fermentation organic matter, coating is conducted, and the coated organic matter is obtained; and (4) uniformly mixing the coated fermented organic matter, biochar, desulfurized gypsum, humus soil, a water-retaining agent and ammonium dihydrogen phosphate to obtain the straw-based biochar composite slow-release fertilizer for saline-alkali soil improvement. The organic fertilizer can improve the pH value of saline-alkali soil, reduce the salt content and increase the organic matter content.

The invention discloses a method for separating and recovering nano-zinc oxide from a zinc-containing solution through complexing-ammonia distillation, and belongs to the field of hydrometallurgy. According to the method, zinc-ammonia complexing is utilized, firstly, impurity ions with low precipitation pH are removed by adjusting the pH value of a solution, then the pH value of the solution is reduced in a heating ammonia distillation mode, and zinc ion precipitation is separated out, so that the zinc ion precipitation is separated from impurity ions with high precipitation pH in the solution, high-purity zinc-containing precipitation is obtained, and finally high-purity nano zinc oxide is obtained through low-temperature roasting. The obtained zinc extraction tailings can be roasted to prepare the NH3-SCR catalyst with excellent performance, a calcium-magnesium-containing solution can be used for CO2 mineralization, and full-quantitative utilization of impurity ions is achieved. According to the method, separation of zinc and impurity ions in the zinc-containing solution can be achieved, the nano-zinc oxide product is obtained, the purity of the nano-zinc oxide product is as high as 97.2%, and the zinc recovery rate reaches 95%. The method realizes the purpose of separating, purifying and preparing the high-purity zinc oxide in the complex solution, has the characteristics of simple process, environment friendliness and low cost, and has wide application prospect and practical significance.

This invention discloses a method for producing protein feed from sprayed corn husks via two-stage solid-state fermentation using microorganisms. The protein feed is obtained by two-stage solid-state fermentation of sprayed corn husks and urea using a compound microorganism. The compound microorganisms include Aspergillus niger, Saccharomyces cerevisiae, Bacillus licheniformis, and Pediococcus pentosaceus. The two-stage solid-state fermentation includes two stages: aerobic solid-state fermentation and anaerobic solid-state fermentation. The crude protein content of the obtained sprayed corn husk protein feed product is 29%–36%, of which the nitrogen-converted protein content of true protein, peptides, and amino acids is 23%–29%, while the nitrogen-converted protein content of urea and inorganic ammonia nitrogen is only 3%–6%. The feed fermentation process can effectively convert low-cost urea into high-value protein, amino acids, and peptides that can be utilized by animals, thereby reducing the cost of protein production.

The invention provides a method for quickly improving salt-resistant fertile soil in soda saline-alkali dry farmland, which comprises the following steps: adjusting a low-salt organic material, mixing and stirring with ferric sulfate powder, carrying out subcritical hydrolysis carbonization, and respectively collecting hydrolysate and solid hydrolyzed carbon; after autumn crops are harvested, conventional straw crushing and stubble cleaning treatment are carried out, hydrolysate and urea are mixed and then sprayed to straw, volcanic slag is spread, and then deep ploughing and field returning are carried out; hydrolyzed carbon and chemical fertilizer are mixed to serve as base fertilizer to be applied in furrows before sowing in spring, and then dry field crops are planted. The number of soil humus and water-stable large aggregates is synchronously and rapidly increased, the salt upward moving amount is reduced, the pH of the soil is reduced, the utilization rate of the fertilizer is increased, the soda saline-alkali soil is improved from the perspective of constructing healthy and fertile plough layer soil, and the grain yield is permanently guaranteed.