415 results about "Alkali carbonate" patented technology

The invention discloses a composite heavy metal polluted soil in-situ fixing method. The method comprises the following steps of: preparing a heavy metal polluted soil restoration agent by using 80 to 90 weight parts of bentonite or kaolin serving as a filling agent, 0.5 to 15 weight parts of ferrous sulfide, 0.5 to 5 weight parts of magnesium sulfate, 1.5 to 8 weight parts of magnesium sulfite, 1 to 5 weight parts of magnesium oxide, 2 to 10 weight parts of calcium hydroxide and 1 to 5 weight parts of phosphorus-containing preparation; and mixing the components and heavy metal polluted soil according to the weight ratio of 1:(5-20), and uniformly stirring to make the humidity of the soil kept between 15 and 30 percent, wherein heavy metal ions in the polluted soil are converted into water-insoluble metal sulfides, hydroxides, multi-metal co-precipitates, basic carbonates and phosphate minerals, the biological activity of heavy metal is lost, and the heavy metal is fixed in the soil. The restored soil meets the requirement of second-level standard values of 'Environmental Quality Standard for Soil' (GB 15618-1995) in China.

The invention discloses a method for synthesizing a cobalt oxide / graphene composite wave-absorbing material and relates to nanometer wave-absorbing materials. The method comprises the following steps: (1) dissolving a metal cobalt salt, ammonium fluoride and urea in water, thereby obtaining a metal saline solution; (2) adding the metal saline solution prepared in the step (1) into a hydrothermal kettle, and magnetically stirring to be uniform; (3) dispersing graphene solid powder into an absolute ethyl alcohol solution, thereby obtaining a graphene alcohol solution; (4) adding the graphene alcohol solution prepared by the step (3) into the metal saline solution prepared in the step (2), mixing, stirring, putting the hydrothermal kettle into a drying oven for reacting, thereby obtaining purple turbid liquid; and centrifuging, washing the obtained precipitate by using the ethanol solution, thereby obtaining a subcarbonate / graphene material; and (5) heating and drying the subcarbonate / graphene material obtained in the step (4), calcining, thereby obtaining the product cobalt oxide / graphene composite wave-absorbing material. The method is simple, high in operability, mild in preparation conditions, clean and pollution-free in reaction process, high in reaction efficiency and high in reproducibility.

First, a ferrous iron-containing suspension solution is obtained by mixing an aqueous ferrous salt solution and an aqueous alkali solution containing one or two of an alkali carbonate and an alkali hydroxide. Then, an iron oxyhydroxide particle precursor is obtained by blowing an oxygen-containing gas having an oxygen component proportion of 0.5 to 0.8 into the suspension solution thus obtained to oxidize the ferrous iron in the suspension solution at an oxidation rate of 30 to 65% while the suspension solution is being controlled to fall in a temperature range of -5 DEG C. or higher and lower than 10 DEG C. Thereafter, the iron oxyhydroxide particles 2 are produced from the iron oxyhydroxide particle precursor by blowing an oxygen-containing gas into the suspension solution containing the iron oxyhydroxide particle precursor while the suspension solution is being controlled to fall in a temperature range of 20 DEG C. or higher and lower than 45 DEG C.

The invention discloses a high water-containing mud curing agent for mine filling and a using method thereof. The curing agent consists of a component A and a component B, wherein the component A consists of alum, sulfuric aluminate and / or ferrous aluminate and / or high-aluminum cement clinker, amorphous SiO2 superfine powder and pelletized blast furnace slag; the component B consists of solid water glass, alkali carbonate, lime and gypsum; and the components are ground into solid fine powder materials of 200 meshes with screen residue of not more than 10 percent, and the solid fine powder materials are mixed uniformly to form the component A and the component B respectively. In use, the component A and the component B are prepared into aqueous slurry respectively, the slurry B is delivered together with mud, the slurry A is separately delivered, and the slurry in double pipes is mixed and cured after the slurry is delivered to a filling field. The strength of the filled cured body in 7 days is 0.5 to 3.5MPa, and the strength of the filled cured body in 28 days is 1 to 5MPa. The high water-containing mud is cured by using a composite gel system, so that the water content and the condensation rate of the mud are improved, the early strength of the mud is increased, and the later strength of the mud is continually increased.

The invention relates to a composite type molten iron desulfurizer and a preparation method thereof, which relates to a novel desulfurizer used for desulfurizing of molten iron or molten steel and a manufacturing process thereof. The components and the weight percentage ratio of the composite type molten iron desulfurizer are: 70.0 to 75.0 percent of CaO, 2.0 to 3.0 percent of TMg, 10.0 to 12.0 percent of CaC2, 8.0 to 10.0 percent of NaHCO3, 0.5 to 1.5 percent of Al, C 1.0 to 4.0 percent of C, 0 to 5.0 percent of CaF2, less than and equal to 0.18 percent of S, less than and equal to 0.10 percent of P and the rest of impurities; the finished product of the desulfurizer is powdery. The preparation method of the sulfurizer is that lime, passivated magnesium powders, calcium carbide, alkali carbonate additives, aluminum powders, graphite or charcoal, fluorite, etc. are utilized as the raw materials and are mixed evenly according to a certain weight percentage, dried and pretreated; passivated liquid is prepared; then the passivated liquid is poured into the materials to be stirred till the materials are dried, and the materials are cooled naturally and ground to make into powdery finished product. Compared with the prior art, the composite type desulfurizer and the preparation method thereof of the invention have the following advantages: short time required by the desulfurizing treatment, small quantity of slags, small temperature drop and good desulfurizing effect; low comprehensive using cost; simple production process and wide resources of the raw materials; improvement of slag forms during molten iron desulfurizing and reduction of iron loss of the molten iron. The calcium carbide, especially the magnesium powders (particles) are the products of high energy consumption, the effect of energy saving is achieved because the composite type molten iron desulfurizer of the invention correspondingly lowers the using amount of CaC2 or Mg.

The invention discloses an animal nutrient additive trace element compound bag as well as a preparation method and an application thereof. The compound bag mainly comprises compound glycine polymineral, selenite and basic salt of a trace element, wherein the compound glycine polymineral contains copper glycinate, ferrous glycinate, zinc glycinate, manganese glycinate and the like; and the basic salt of the trace element contains at least one of basic chlorate, basic carbonate and basic sulfate corresponding to the trace elements such as copper, zinc, and manganese. The preparation method comprises the following steps of: mixing the glycine raw material and the inorganic trace element compound, adding the mixture into water, regulating the pH value, heating, fully stirring, reacting, then discharging, adding other raw materials into the reaction product to form uniformly dispersed suspension, drying, granulating, and thus obtaining the trace element compound bag. The trace element compound bag can be used as an animal feed additive, and has the advantages of simplified process, high biological value, low adding quantity, obvious growth-promoting effect, low side reaction of animals and the like.