133results about How to "Reduced chromium content" patented technology

This invention relates to a process of synthesis and composition of open chain (ring), closed ring, linear branched and or substituted polyamines, polyamine derived tyrosine phosphatase inhibitors and PPAR partial agonists/partial antagonists via a series of substitution reactions and optimizing the bioavailability and biological activities of the compounds. Polyamines prevent the toxicty of neutoxins and diabetogenic toxins including paraquat, methyphenyl pyridine radical, rotenone, diazoxide, streptozotocin and alloxan. These polyamines can be to treat neurological, cardiovascular, endocrine acquired and inherited mitochondrial DNA damage diseases and other disorders in mammalian subjects, and more specifically to the therapy of Parkinson's disease, Alzheimer's disease, Lou Gehrig's disease, Binswanger's disease, Olivopontine Cerebellar Degeneration, Lewy Body disease, Diabetes, Stroke, Atherosclerosis, Myocardial Ischemia, Cardiomyopathy, Nephropathy, Ischemia, Glaucoma, Presbycussis, Cancer, Osteoporosis, Rheumatoid Arthritis, Inflammatory Bowel Disease, Multiple Sclerosis and as Antidotes to Toxin Exposure.

The invention relates to a method for treating waste water containing vanadium and chromium. The method comprises the following steps of: (1) adsorption: adopting an adsorbing medium to adsorb vanadium and chromium ions in the waste water containing vanadium and chromium; (2) desorption: adding a desorption agent into the adsorbing medium containing vanadium and chromium ions obtained in the step (1) to carry out desorption; (3) vanadium precipitation: adding alkaline substances into desorption solution, stirring to be uniform, and then filtering to obtain a calcium-vanadate product and vanadium-precipitated supernant; (4) chromium crystallization: carrying out evaporating concentration and cooling crystallization on the vanadium-precipitated supernant to obtain a sodium-chromate crude product and crystallizing mother liquor; (5) recrystallization: heating and dissolving the sodium-chromate crude product, and carrying out cooling crystallization to obtain a sodium-chromate product and cooling-crystallizing mother liquor; and (6) returning of the crystallizing mother liquor: returning the crystallizing mother liquor to the step (2) as the ingredient of the analysis solution to be repeatedly utilized. The method has the advantages that the recovery rate for the vanadium and chromium elements in the waste water reaches 99.9% or higher, simultaneously high-purity calcium vanadate and sodium chromate are obtained, and no waste water and waste residue are generated in the whole process.

The invention discloses a preparation method and an application method of a low-temperature low-chromium dyeing auxiliary agent of an acidic medium dye for wool. The preparation method comprises the steps that: 1, protein powder is prepared by using waste duck feather, wherein (1) the duck feather is subjected to pretreatment; (2) the suck feather is subjected to a dissolving treatment; and (3) duck feather protein powder is prepared; 2, a sodium hydroxide solution is prepared, and the sodium hydroxide solution is used for dissolving the duck feather protein powder; 3, sodium hydroxide, triethanolamine, and epichlorohydrin are adopted for preparing a cationic quaternary ammonium salt cross-linking modification agent WLS; and 4, the low-temperature low-chromium dyeing auxiliary agent for the acidic medium dye is prepared. The auxiliary agent can be used as a wool modification agent. After wool fibers are modified, wool fiber dyeing properties of acidic medium dyes are greatly improved, dye uptake percentage rate can be improved, mordant absorption performance of the dye is improved, chromium pollution in dye wastewater is reduced, wool fiber low-temperature low-chromium dyeing is realized, and waste duck feather keratin is effectively utilized. After modification, the wearability of wool products is improved.

The invention relates to a technical field of tanning chemistry and engineering, and provides a production technology for improving the smoothness and fineness of the grain surface of leather. According to the production technology, the grain surface of the cow leather obtained through the production technology is smooth, fine, tiny in pores, attractive, elegant, high in product grade, good in physical and mechanical properties, soft and comfortable in hand feeling and good in resilience, and in addition, the production technology is simple and easy to realize, appropriate in production cost and suitable for mass production and use. The production technology for improving the smoothness and fineness of the grain surface of the leather sequentially comprises the following steps of carryingout splitting on limed hide, carrying out deliming, softening and pickling, carrying out tanning, carrying out wringing and shaving, carrying out softening, carrying out retannin, carrying out neutralizing, carrying out filling, carrying out greasing, carrying out overdyeing and carrying out post treatment, wherein the tanning process adopts an aluminum-contained multi-metal tanning agent and a chrome tanning agent for co-tanning, the retanning process adopts a liquid betel nut tannin extract, an aldehyde tanning agent, an amphoteric synthetic tanning agent and the aluminum-contained multi-metal tanning agent for retanning, and the filling process adopts a micromolecular acrylic resin retanning agent, a phenolic condensation compound, a naphthalene sulfonic acid condensation compound, a synthetic greasing agent, sulfonated natural oil and a plant tannin extract for filling.

The invention relates to a method for refining sodium sulfate powder from chromium-containing mirabilite. The method comprises the following steps: a) grinding the chromium-containing mirabilite in the presence of water to prepare water-containing slurry; b) regulating the pH of the water-containing slurry obtained in the step a) with sulfuric acid to 2-3, and then adding sodium sulfite to reduce hexavalent chromium in the water-containing slurry to trivalent chromium, thus obtaining a saturated or over-saturated sodium sulfate water solution; c) stirring and crystallizing the saturated or over-saturated water solution which is obtained after reduction in the step b); d) filtering out crystals obtained in the step c); e) washing the crystals obtained in the step d) with the saturated sodium sulfate water solution; f) re-crystallizing the washed crystals obtained in the step e) with a saturated neutral sodium sulfate water solution to obtain the sodium sulfate powder. According to the method provided by the invention, additional heating is not required, the energy consumption is low, the obtained sodium sulfate powder has high yield and high purity, the content of sodium sulfate can achieve 99.00-99.90wt%, and the chromium content does not exceed 5ppm.

The invention relates to an original form dechroming method for chrome leather fragment, and application of a product thereof in fertilizer aspect. The method comprises the following steps of: adding water and calcium oxide, soaking at 20-40 DEG C for 1-4 days, washing by water and filtering; adding water, acid and salt into the filter residue, dechroming at 20-30 DEG C for 2-4 hours, washing by water and filtering; continuing to add water, salt and alkaline into the filter residue, keeping the temperature and dechroming for 30-60 min, regulating the pH to be neutral, washing by water and filtering; obtaining an original form dechromed product of chrome leather fragment; mixing and crushing the original form dechromed product of chrome leather fragment with plant ash, pelleting, and thus containing an agricultural composite fertilizer. The composite fertilizer not only has low chrome content and is rich of potassium element and organic nitrogen, but also has certain slow release function, and can effectively promote growth of plants.

The invention relates to resource utilization of chrome leather solid wastes, in particular to a method for preparing an amino acid chelated fertilizer by using chrome leather solid wastes. According to the invention, the method comprises the following steps of: using the chrome leather wastes as raw materials, dechroming and hydrolyzing the chrome leather wastes so as to generate an amino acid, and then chelating trace elements so as to prepare the amino acid chelated fertilizer. The method for preparing the amino acid chelated fertilizer by using the chrome leather solid wastes, provided by the invention, has the advantages of simple process and easiness in operation; collagens in the chrome leather solid wastes are completely hydrolyzed to be chelated with the trace elements so as to prepare the chelated fertilizer; the chrome content of the chelated fertilizer is less than national standard; and the chelating rate of the collagens and the trace elements is more than 95%. The chelated fertilizer prepared by using the method provided by the invention can be used for leaf surface spraying, seed soaking and root pouring and has an obvious effect on yield increase of crops.

A process for treating the industrial sewage containing Cr and V includes such steps as preparing the solution of sodium pyro-sulfite, proportionally adding it to the sewage in reduction tank, reducing the 6-valence Cr to 3-valence Cr, proportionally adding the solution of sodium hydroxide to the sewage in neutralizing tank for reaction between V2O2 and sodium hydroxide to generate Na2V4O9 * 4H2O, reaction between V4O9 and said 3-valence Cr to generate Cr2(V4O9)3 deposit and changing residual 3-valence Cr to chromium hydroxide deposit, regulating pH=7.5-8.5, clarifying, and press filtering of suspended substance.

The invention discloses a salt-free high-chrome-absorption chrome tanning method for animal skin and application of the salt-free high-chrome-absorption chrome tanning method. The salt-free high-chrome-absorption chrome tanning method is characterized by comprising the following steps of treating pretreated animal skin by using aromatic sulfonic acid or a low-molecular polycondensate thereof; regulating the pH value of the animal skin to 4.0-6.5 under the condition that no neutral salts such as sodium chloride and sodium sulfate are used; and carrying out chrome tanning under a relatively high initial pH value condition to realize salt-free high-chrome-absorption tanning. By using the salt-free high-chrome-absorption chrome tanning method, the problem that the quality and performances of leather or fur are influenced because the skin possibly has the acid expansion phenomenon under salt-free and acidic tanning conditions, the combination of chrome and the surface of the skin are excessively fast during the tanning, and the chrome cannot permeate the skin easily under the relatively high initial pH value condition is solved; and compared with the conventional chrome tanning method, the chrome tanning method disclosed by the invention is advantaged in that the chrome tanning efficiency is remarkably increased, the consumption of chrome can be reduced by more than 30%, the absorption rate of chrome is up to more than 98%, the concentration of chrome in chrome tanning effluent is reduced to be less than 50mg/L, chrome in wet blue leather is more uniformly distributed, and the chrome tanning effluent can be recycled many times. By using the salt-free high-chrome-absorption chrome tanning method, the chlorine and chrome pollution generated in the leather and fur preparation processes is remarkably reduced.

The invention relates to high-manganese low-chromium type hot work die steel and a preparation method of the high-manganese low-chromium type hot work die steel, and belongs to the technical field ofhot work die steel. The high-manganese low-chromium type hot work die steel is prepared from, by mass, 0.35-0.45% of C, 0.50-1.20% of Si, 0.60-1.20% of Mn, 3.75-4.50% of Cr, 0.80-1.20% of Mo, 0.30-0.60% of V, 0.50-5.50% of Co, 0.80-3.00% of Ni, less than 0.02% of P, less than 0.02% of S and the balance Fe and inevitable impurities. The high-manganese low-chromium type hot work die steel is prepared through the processes of material preparation, smelting, casting, electroslag remelting, high temperature homogenization treatment, forging, annealing and heat treatment. Compared with existing H13hot work die steel, the high-manganese low-chromium type hot work die steel has higher toughness and higher heat stability.

This invention relates to a method for producing chromates, especially for producing alkali metal chromates. The method comprises following steps: the obtaining of a mixture of alkali metal hydroxide, alkali metal chromate, and ferrous residue after the reaction of chromite ore with an oxidant in the reactor in the presence of molten salt or in aqueous solution of alkali metal hydroxide, the obtaining of a leaching slurry by leaching the reaction products with aqueous solution of alkali metal hydroxide, the separating of the primary chromate product from the leaching slurry, the obtaining of pure chromate crystal by purifying the primary chromate product. Both the primary chromate product and the pure chromate crystal can be used as the raw materials to manufacture other chromium compounds. Compared with the currently-used roasting method, the method has the advantages of decreasing the reaction temperature by about 700° C., of improving the chromium recovery rate up to nearly 100%, of minimizing the amount of the ferrous residue by not adding calcium-containing auxiliaries, and of completely eliminating the disposal problem of the chromium-containing residue and the environmental pollution due to the addition of calcium-containing auxiliaries, by using ferrous residue as the raw materials for other industries after extraction of magnesium.

The invention discloses an efficient farmland utilization method for cultivating single-season rice, ratoon rice and wild fungi and mainly solves the technical problem that existing farmland utilization rate is not high, waste straw treatment methods are not environmentally friendly, the economic benefits are not high and the like. The technical scheme is characterized as follows: by cultivating the ratoon rice, labor force output is reduced while the grain yield is guaranteed, first rice straw is crushed and returned to the field, growing of weeds in the rice field can be avoided, the field can be fertilized, cadmium reduction and selenium enrichment measures are taken, low-cadmium and selenium-rich rice is produced, straw after harvesting of the ratoon rice is laid on the field, the wildfungi are planted on the straw, propagation of the wild fungi can accelerate rotting of the straw, after the wild fungi are harvested, the straw further rots to form organic fertilizer, the soil fertility is enhanced, and the soil property of the field is improved.

The invention belongs to the field of leather tanning process and relates to a process for tanning and softening sheepskin by a multi-carboxylic nano compound chrome tanning additive. In a traditional chrome tanning method, the use of various chemicals in picking and chrome tanning procedures causes damage to the ecological environment. According to leather tanning mechanisms and structural features of collagenous fiber and the multi-carboxylic nano compound chrome tanning additive, the process used for leather tanning and skin softening is characterized in that the shrinkage temperature of blue wet leather can reach 105 DEG C, the grain side is flat and fine, and the requirements of goat skin garment leather can be met; compared with the method that 8 percent of chromium powder is adopted for conventional tanning liquid waste, liquid waste is characterized in that the content of Cr2O3 in the liquid waste is reduced to 172 mg/L from 1,952 mg/L, and the content of chromium in the liquid waste is reduced greatly; compared with the conventional chrome tanned leather, the chrome tanned leather treated through the process has the advantages that excellent effects to follow-up backwater, neutralization, and control to chromium pollution in dying and oiling liquid waste are achieved, the physical and mechanical performance of crust leather is similar, compact hand feeling is achieved, the filling performance and the softness are excellent, and the requirements of the goat skin garment leather can be met.

The invention discloses a grate bar and a preparation method thereof, which belongs to the technical field of heat-resisting materials. The grate bar comprises the following chemical components in percentage by mass: 1.2 to 1.6 percent of C, 15.0 to 20.0 percent of Cr, 2.3 to 2.8 percent of Al, 4.5 to 5.0 percent of Si, 0.05 to 0.15 percent of Ti, 0.05 to 0.15 percent of Nb, 0.08 to 0.20 percent of RE, 0.06 to 0.15 percent of Mg, less than 0.6 percent of Mn, less than 0.04 percent of S, less than 0.05 percent of P and the balance of Fe, wherein the total mass of the Ti and the Nb is more than or equal to 0.20 percent and less than or equal to 0.28 percent. The grate bar of the invention can be produced by electric furnace and is formed by lost foam casting; the grate bar has high strength, high toughness, high inoxidizability and high thermal fatigue resistance, and can be used on large sintering machine trolley for more than 2 years; and when the grate bar is used, the labor intensity of workers can be relieved, the production efficiency of the sintering machine can be improved, and great social and economic benefit can be created.

The invention belongs to the technical field of arc additives, and discloses a duplex stainless steel wire material for arc additives. The duplex stainless steel wire material is composed of a metal powder core and a steel strip, the metal powder core comprises, by mass, 55-90% of chromium powder, 0-5.5% of nickel powder and the balance powder; the invention further discloses a duplex stainless steel member, which is obtained by the duplex stainless steel wire through an arc additive process. By means of the duplex stainless steel wire for the arc additives, the duplex stainless steel member with the austenite content being about 50% and meeting the standard specification can be directly obtained through arc additive manufacturing; the corrosion resistance of the duplex stainless steel member is greatly improved, and the cost of the duplex stainless steel member is obviously reduced; and meanwhile, the duplex stainless steel member which is complex in shape, high in strength and high in corrosion resistance can be produced and manufactured.

The invention relates to the technical field of tanning waste source utilization and provides a method for preparing a semi-chrome tanning addition agent through waste chrome shavings and an application method of the semi-chrome tanning addition agent. Waste chrome shaving resources can be effectively converted into the semi-chrome tanning addition agent so as to be reused in the leather production and preparation processes, and the dual economic benefits of environment-friendly tanning and reduction of tanning cost are achieved. According to the method for preparing the semi-chrome tanning addition agent through the waste chrome shavings, collagen hydrolysate liquor is obtained through acid hydrolysis of the waste chrome shavings and then modified through unsaturated dicarboxylic acid andtetrakis hydroxymethyl phosphonium salt, the semi-chrome tanning addition agent is obtained, carboxyl functional groups of collagens in the semi-chrome tanning addition agent are increased, the jointpoints of proteins in the obtained semi-chrome tanning addition agent and a chrome tanning agent are increased, thus, combination and absorption of leather treated through the obtained semi-chrome tanning addition agent and the chrome tanning agent are promoted, meanwhile, the obtained semi-chrome tanning addition agent has certain tanning performance and filling property, the crust leather contraction temperature can be increased, and the fullness, elasticity and grain surface flatness of crust leather are improved.