30results about How to "Solve the problem of high value utilization" patented technology

The invention relates to a method for recovering ammonium chloride by preparing complex salt of magnesium ammonium chloride hexahydrate (HH4MgC13 6H2O). The method comprises the following steps of: placing aqueous solution of ammonium chloride into a crystallizing kettle; regulating the pH of the solution to 4 to 6 by hydrochloric acid; controlling the temperature of the crystallizing kettle in the range of 10 to 80 DEG C; adding magnesium chloride into the crystallizing kettle under the stirring condition, stopping adding the magnesium chloride when the concentration of the magnesium chloride in the solution reaches 3 to 5mol / L and then continuously stirring for 30 to 120 minutes; drying filtered solid to obtain magnesium ammonium chloride hexahydrate; and decomposing the magnesium ammonium chloride hexahydrate at a lower temperature of 0 to 50 DEG C to obtain solid of ammonium chloride. With the adoption of the method, no waste liquid is discharged in the whole process, and an ammonium chloride recovery process and a magnesium precipitating process are well integrated. The method has strong operability and is easy to realize industrialization.

The invention discloses a preparation method of a soil conditioner taking phosphogypsum as a raw material, and belongs to the technical field of phosphogypsum resource utilization. The preparation method comprises the steps of smashing the raw material, namely the phosphogypsum, and mixing with wet-process activated carbon evenly according to a certain ratio, then adding ammonium hydroxide or ammonia-nitrogen wastewater to carry out an acid-base neutralization reaction, obtaining a solid product and filter liquor after performing solid-liquid separation on a reactant, and drying the solid product to obtain the soil conditioner. The obtained soil conditioner is charcoal grey and in the shape of amorphous wet powder particle, has flexibility and elasticity, has no dust, has high specific surface area and high adsorptive property, and meanwhile, contains multiple nutritional ingredients required by the growth of crops, wherein ammonium hydrogen phosphate and ammonium dihydrogen phosphate have the capabilities of adjusting and stabilizing the pH value. The soil conditioner strengthens the capability of conditioning soil, increases the storage property, and really has eurytopicity, specificity, versatility, environmental protection property and economy.

The invention relates to a modified slag powder and a preparation method thereof. The preparation method comprises the following steps: performing heat treatment on the silico-calcium slag to obtain the heat-treated silico-calcium slag; mixing the heat-treated silico-calcium slag with coal ash, slag, gypsum, a cement grinding aid and an additive and grinding to obtain the modified slag powder. According to the preparation method, the silico-calcium slag powder is prepared by use of the silico-calcium slag by-product of producing alumina from the coal ash, and therefore, the application ways of the silico-calcium slag are expanded and the performance indices such as the strength of the concrete can be improved; on the other hand, the modified slag powder prepared by use of the method is superior to common blast furnace slag powder in both early strength and long-term strength, and the various indices at least conform to the standards of the national S95 grade slag powder, and therefore, the modified slag powder can be used as a cement or concrete admixture; the production operation process of the modified slag powder is simple and convenient and the problems of consumption and high value utilization of the silico-calcium slag can be effectively solved; in short, the modified slag powder has great popularization and application value.

The invention relates to the field of chemical industry production of formate from CO2, particularly a catalyst for preparing formate from CO2 and a preparation method thereof. The method for preparing the catalyst for preparing formate from CO2-containing synthetic gas, which is a spent contact mass generated in an organosilicon monomer methyl chlorosilane production process, comprises the following steps: washing the spent contact mass with an organic solvent, filtering, roasting, dissolving with acid, precipitating with alkali, filtering, drying and calcining. The invention solves the problem of high-value comprehensive utilization of solid residue spent contact mass in organosilicon synthesis industry. The prepared catalyst for preparing formate from CO2-containing synthetic gas has the advantages of low raw material cost and simple operational method, and can easily implement large-scale production; and the catalyst provided by the invention has higher formate synthesis activity, higher heat stability and better reproducibility, and is beneficial to controlling the product quality.

The invention provides a method for preparing xonotlite from calcium disodium silicate. The method comprises 1, mixing calcium disodium silicate and a sodium hydroxide solution, carrying out a reaction process at a temperature of 120-200 DEG C for 0.5-3h and orderly filtering and drying the reaction product to obtain a calcium silicate hydrate and 2, mixing the calcium silicate hydrate and water, carrying out gradient heating to a temperature of 200-260 DEG C, carrying out a thermal insulation reaction process for 1-8h and orderly filtering and drying the reaction products to obtain xonotlite. The method utilizes calcium disodium silicate-containing alkali-containing industrial residue as a raw material which has a low price and stable performances so that a xonotlite production cost is greatly reduced. The method can be operated by simple processes and has short reaction time. Alkali in calcium disodium silicate can be recovered and recycled in a form of a high concentration caustic solution so that the method is suitable for industrial production.

The invention relates to a method for comprehensively utilizing waste residues and liquid waste of animal biochemical products and belongs to the technical field of biology. The method includes steps of enzymolysis of waste residues and liquid waste; bag filtration of enzymolysis liquid to obtain filter residues and filtrate; filtrate filtering by a micro-filtration membrane to obtain concentrated liquid and permeating liquid; nanofiltration and concentration of the permeating liquid and obtaining concentrated liquid and permeating liquid; secondary nanofiltration and concentration of the permeating liquid to obtain concentration liquid and permeating filtrate; dechlorinating and purifying of the permeating liquid by the reverse osmosis technology and respectively collecting the concentrated liquid and the permeating liquid; mixing the concentrated liquid with the residues of the bag filtration, microfiltration and combining the concentrated liquid of the primary nanofiltration; vacuum drying via microwaves and obtaining animal protein crude products for feeding and edible animal protein crude products; freezing and drying of the concentrated liquid of the secondary nanofiltration and obtaining officinal polypeptide crude products. The method for comprehensively utilizing waste residues and liquid waste of the animal biochemical products is simple in process and low in production cost, products at various levels are good in quality, comprehensive utilization level of the waste residues and the liquid waste of the animal biochemical products is improved, and the problems about environmental pollution and high-valued utilization are solved.

The invention discloses a chitosan-copper-loaded montmorillonite intercalation composite material, a preparation method and an application thereof. Chitosan-copper-loaded montmorillonite intercalation composite material uses copper-loaded montmorillonite powder as the main material of the intercalation, and uses chitosan for intercalation composite, wherein the copper content of copper-loaded montmorillonite powder is 0.5% ~5%, the molecular weight of chitosan is 10~50kDa. The chitosan-copper-loaded montmorillonite powder intercalation composite material disclosed by the present invention has a large specific surface area. The copper-loaded montmorillonite powder is used as the main body of the intercalation composite material, and chitosan is used for intercalation fusion, which will have antibacterial properties. Combination of chitosan with astringent, mucosal repair and immune enhancement activities and copper-loaded montmorillonite powder with adsorption, antidiarrheal and antibacterial effects makes the two synergistic and can be better used for the treatment of porcine inflammatory bowel disease Prevention and control can reduce the diarrhea rate of weaned piglets and adult pigs to 20%, and can be widely used in the field of feed additives.

The invention provides a method for preparing xonotlite from disodium silicate calcium. The method comprises the following steps that disodium silicate calcium and a sodium hydroxide solution are mixed, and the mixture is heated to reach the temperature of 200-260 DEG C through a temperature-gradient method and subjected to a heat-preserved reaction for 1-8 h; a reaction product is filtered and dried in sequence, and xonotlite is obtained. Alkali-containing industrial waste residue containing disodium silicate calcium is adopted as a raw material, the raw material is low in cost, easy to obtain and stable in performance, and therefore the production cost of the xonotlite is greatly reduced; in addition, the method is easy to operate, short in reaction time and particularly suitable for industrial production.