253results about How to "Reduce Chloride Content" patented technology

The invention belongs to the technical field of methods for preparing polycarboxylic acid water reducers. A method for preparing a polycarboxylic acid water reducer comprises the following: a step 1 of esterification, in which a poly(ethylene glycol methyl ether)acrylate macromonomer is synthesized by using methoxy polyethylene glycol and acrylic acid in a molar ratio of 1:1.1 to 1:1.5 at 100 to 120 DEG C, water is separated out in a reaction process, and the molecular weight of the macromonomer is 1,250 to 3,000; and a step 2 of polymerization, in which aqueous solution of the macromonomer is prepared, an unsaturated monomer and a catalyst A are added in turn at 40 to 50 DEG C, the temperature is kept constant at 28 to 40 DEG C, aqueous solution of anhydrous sodium hydrogensulfite or vitamin c is dripped, the concentration of a solid content is kept between 35 to 45 percent by adjusting water content, stirring is stopped, and the solution is allowed to stand for 1 to 1.5 hours, the pH value is kept between 6 and 8 by alkaline reagent after the reaction is finished, and the catalyst A is peroxyacetic acid or potassium peroxydisulfate. The invention has the advantages of low cost, simple process and high product performance.

The invention provides an incineration fly ash cement kiln synergic processing process comprising the following steps of: a, carrying out washing treatment on incineration fly ash twice to three times; b, dewatering the incineration fly ash subjected to the washing treatment in a dewatering device to obtain a fly ash filter cake, wherein the water ratio of the fly ash filter cake is 25-30 percent, and the concentration of chloride ions is 0.3-0.6 percent; c, processing washing waste water generated in the step a through a carbonization-coagulating sedimentation process to obtain waste water processing precipitates; d, mixing the waste water processing precipitates and the fly ash filter cake with cement raw materials in proportion, wherein obtained materials are used as production raw materials of cement clinker; and e, calcining the production raw materials of the cement clinker under the condition of high temperature of 1100-1450 DEG C. The incineration fly ash cement kiln synergic processing process has little energy consumption and can be used for efficiently treating heavy metal, overcomes the defect that a non-ferrous metal extraction technology can not eliminate organic pollutants contained in the fly ash and realizes the thorough harmlessness of the fly ash.

The invention provides a process for preparing sodium dichromate, namely producing the sodium dichromate through a carbonization method comprising: converting sodium chromate into the sodium dichromate via carbon dioxide under pressurizing condition; delivering sodium chromate neutral liquor with impurities removed to a carbonization tower after a cascade reaction of more than three continuous towers; obtaining carbonizing liquor by controlling different gradient parameters (concentration and temperature of the carbonizing liquor, partial pressure of the carbon dioxide, carbonizing time and the like), continuously carbonizing and separating under pressure; obtaining sodium dichromate finished products through concentrating, filtering, evaporating, crystallizing and centrifugal dehydrating.

The invention discloses a method for recycling glyphosate mother solution, and belongs to the technical field of chemical engineering. The method comprises the following steps: producing glyphosate and glyphosate mother solution by a glycine method or an iminodiacetic acid method; concentrating the glyphosate mother solution; carrying out an oxidization treatment on the glyphosate mother solution concentrate; cooling and crystallizing the glyphosate mother solution oxidation solution, taking out the crystallized glyphosate mother solution oxidation solution and concentrating; concentrating the permeate to obtain a sodium chloride product, and reusing the distillate; adjusting the pH value of the concentrate to 3-4, and then carrying out a photocatalytic oxidation reaction; adjusting the pH value to obtain a disodium hydrogen phosphate product or a trisodium phosphate product. According to the method disclosed by the invention, the concentration treatment is carried out before the glyphosate mother solution is oxidized, thus reducing the content of chloride ions in the glyphosate mother solution, increasing the concentration of the reactant, and increasing the efficiency of the subsequent oxidization reaction; hydrogen peroxide photocatalytic oxidation is carried out on the concentrate, the reaction is thorough, the oxidability is better, the substances difficult to oxidize by oxygen-enriched wet oxidization can be oxidized, and the reaction conditions are moderate.

The invention relates to the field of chlorinated polyethylene preparation, in particular relates to a preparation method of chlorinated polyethylene based on hydrochloric acid suspension chlorination. The method comprises the following steps: adding polyethylene used as a raw material in a chlorination reactor containing 18-25% hydrochloric acid, a surfactant, an initiator and a dispersing agent, and heating to above 70 DEG C under the condition of stirring; introducing chlorine gas at a certain temperature and pressure, and opening a connection valve of the reaction kettle and a graphite cooler when the temperature in a kettle reaches 120 DEG C and the pressure in the kettle exceeds 0.4MPa so that steam enters the cooler to be condensed into liquid; respectively separating gaseous hydrogen chloride and liquid hydrochloric acid by a gas-liquid separator and discharging gaseous hydrogen chloride and liquid hydrochloric acid respectively; after introduction of chlorine is finished, closing the connection valve of the reaction kettle and the graphite cooler; introducing cooling water into the clamp sleeve of the reactor so that the temperature of the material is reduced to less than80 DEG C; and washing solid material obtained by solid-liquid separation with water, and drying so as to prepare chlorinated polyethylene. Chlorinated polyethylene prepared by the method can be used as an impact resisting modifier of plastic and a special synthesis rubber.

The invention discloses a slow hardening pump deliver type three expansion source concrete expansion agent, which is characterized by comprising preparation of raw materials such as anhydrite, high alumina chamotte, high-calcium sulphoaluminate chamotte, calcined magnesite and so on by weight portion and externally doped slushing agent, water retention agent, air entraining agent and retardant. The preparation method of the expansion agent comprises steps of crushing, common mixture, mixing and grinding and external doping mixture and finish product forming. The product has low alkali content, excellent expansion performance, strong suitability with concrete, balanced mechanical property after hardening, and small gradual slump loss of concrete shrinkage compensation, contributes to improving safety and durability of reinforced concrete, obviously improves the cracking resistance, volume stability, impermeability and frost resistance, and is simple and convenient to use and easy to control quality in construction. The slow hardening pump deliver type three expansion source concrete expansion agent can meet construction use requirements of commercial concrete, long distance pump-delivering concrete and mass concrete.

The invention belongs to the technical field of high polymer materials, and particularly relates to a rubber-plastic blending foam material and a preparation method thereof. The rubber-plastic blending foam material is prepared from components in parts by weight as follows: 25-35 parts of a rubber-plastic blending material, 5-8 parts of a foaming agent, 0.05-0.3 parts of a vulcanizing agent, 1.5-1.8 parts of an accelerant, 25-35 parts of filler, 5-8 parts of carbon black, 0.5-1 part of paraffin, 15-20 parts of chlorinated paraffin, 0.1-0.2 parts of stearic acid, 1-2 parts of epoxy soybean oil,0.3-0.5 parts of zinc oxide, 0.5-1 part of polyethylene glycol and 0.1-0.5 parts of an anti-aging agent. By means of proportion optimization selection of the components, content of chlorine ions in the obtained rubber-plastic blending foam material is lower than 400 ppm, and after a copper pipe is wrapped with the material and used for 240 h at the temperature of 60 DEG C and humidity of 95% plusor minus 3%, the color of the copper pipe can be close to that of a copper tube which is not wrapped with the rubber-plastic blending foam material.

The invention discloses a polycarboxylate superplasticizer with super high early strength and a preparation method of the polycarboxylate superplasticizer. The polycarboxylate superplasticizer is prepared as follows: amine polyoxyethylene ether, acrylic acid, maleic hydroxy acid ester and allyl amine are taken as monomers and added with an inorganic peroxide initiator for free radical copolymerization, main chains of molecules of the superplasticizer contain carboxylic acid groups, sulfonic acid groups and amino groups simultaneously, side chains adopt long-chain polyamine ether, and the ratio of polyoxyethylene ether to acrylic acid to water to maleic hydroxy acid ester to allyl amine to the inorganic peroxide initiator in parts by mass is 100:(20-30):(100-150):(2-10):(2-10):(0.1-0.5). The invention further provides the preparation method of the polycarboxylate superplasticizer. The polycarboxylate superplasticizer with super high early strength has the advantages of short setting time, high early strength, good adaptability, extremely low chlorine ion content and capability of improvement of the concrete durability; meanwhile, the production process is simple, low in cost, environment-friendly and pollution-free, and mass production can be realized.

The invention relates to a snowmelt agent, which is a composite snowmelt agent and comprises the following components and contents (weight) in percentage by weight: 80 to 95 percent of acetate and 5 to 20 percent of chloride. Compared with the prior art, the snowmelt agent has good snow removing effect and low chloride content, can reduce the corrosivity of the snowmelt agent obviously, effectively protects pavement and bridges, prolongs the service life of public facilities and reduces the cost while achieving excellent snow removing effect.

The invention belongs to the technical field of environmentally friendly chemicals, particularly relates to a low-chloride snow-melting agent and further discloses a preparation method of the low-chloride snow-melting agent.According to the low-chloride snow-melting agent, sodium borate, sodium formate, calcium chloride, ammoniom acetate, ethylenediamine tetraacetic acid disodium, urea, potassium citrate, sodium gluconate and sodium bentonite serve as preparation raw materials, the content of chlorine salt is low, adopted raw materials are all ingredients which are safe, free of toxin and environmentally friendly and completely meet the requirement for environmentally friendliness.The prepared low-chloride snow-melting agent has the advantages of being low in freezing point (the freezing point of 200 g/L is lower than minus 11 DEG C), high in dissolution velocity (the speed is higher than 10 g/min), high in ice melting capacity (90% higher than snow melting capacity of sodium chloride) and small in corrosion of carbon steel materials (corrosion is smaller than 0.03 mm/a), can be widely applied to snow melting and freezing prevention of various roads, is low in chlorine ion content of a product and is consistent with the current development requirement of environmental protection.

The present invention relates to the manufacture and an application method for auxiliary agent which can reduces the low temperature reducibility index of sintered ore. With the weight percentage ratio, the auxiliary agent has the chemical formula that boric acid is 3-5 percent, calcium chloride is 30-40 percent, calcium nitrate is 30-40 percent, magnesium sulfate is 25-30 percent, and fatty alcohol polyoxyethylene ether is 1-10 percent; the chemical agent with suitable content and granularity is evenly mixed, and is packed and sealed into bags with 25 kg per bag. The prepared auxiliary agent is completely dissolved with water of 3 percent content, and the prepared solution is sprayed to the sintered ore with 3.4 kg/ton content. The present invention provides the preparation and the application method of the chemical agent suitable for reducing the low temperature reduction and the pulverization of the sintered ore with simple formula, remarkable effect, low cost, and simple application method, and by adopting the auxiliary agent, the low temperature reduction and pulverization indexes of the sintered ore can be effectively reduced by about RDI _{+ 3.15 mm} 10 percent.

The invention relates to the technical field of preparing nickel oxide and recovering hydrochloric acid, and in particular relates to a process and equipment for preparing nickel oxide and recovering hydrochloric acid. The equipment comprises a nickel oxide solution tank for recovering waste acid, a waste acid filter, a pre-concentrator, a baking furnace, a furnace top spraying device, burners in tangent distribution, a rotary horizontal mixer, a breaker, a rotary valve, a nickel oxide powder pneumatic conveying and collecting system, a first-stage absorption tower, a second-stage absorption tower, a smoke exhaust fan, a washing tower, a feeding pump sealing as well as cooling water circulating and supplying device, a pyrolysis acid storage tank, a conveying pipeline, a gas and liquid separator, a chimney, a dust extractor, a pneumatic feeding device, a feeding pipeline online cleaning device, a combustion supporting and heating device, a back-flushing flow aiding device, a chlorine removal device and an air purifier. The process and the equipment for preparing nickel oxide and recovering hydrochloric acid have the following advantages that reaction temperature regulating range of the baking furnace is widened, waste gas reaches the discharge standard, equipment utilization rate of the baking furnace is improved, and environmental pollution is avoided.

The invention discloses a recycle method of recycled water, which comprises the steps of: mixing cooked wastewater with the recycled water by the biochemically-treated and deeply-treated discharged water; and treating the mixed water through a lime+flocculation precipitating working procedure, a multi-medium filtering working procedure, a filtering working procedure by active carbon, a softening working procedure by a softener, an ultra-filtering working procedure and a reverse osmosis working procedure to obtain recycling water, wherein the recycling water is used as compensating water of circulating water, greening water, boiler water or fire fighting water. The recycle method of the recycled water can be used for wholly recycling the cooker wastewater; and the recycle method of the recycled water is used for mixing the cooked wastewater with the recycled water such as the circulating water wastewater, deoxidization station reverse osmosis concentrated water, the boiler wastewater and the like through the biochemically-treated and the deeply-treated discharged water and then treating the mixing water together, so that the quality of the recycled water is improved, the treatment difficulty is reduced, and the recycled water is high in yield and low in cost.

The invention discloses a whole-process nutrient supply type composite fertilizer and a preparation method thereof. A raw material containing nitrate nitrogen, ammonium nitrogen, amide nitrogen, controlled release nitrogen and organic matters is added in the material. The components of the whole-process nutrient feeding type composite fertilizer are effectively proportioned in percentage by mass on the basis of nitrogen content: 2-4% of nitrate nitrogen, 5-8% of ammonium nitrogen, 5-8% of amide nitrogen and 6-10% of controlled release nitrogen, the contents of phosphorus and potassium are determined according to different product proportions, and the content of the organic matters is not less than 6%. In the production process, the viscosity of urea nitrate generated in a reaction of ammonium nitrate phosphate and urea and granulation tail gas washing water are used as liquid phase amount necessary for granulation to finish the material granulation process, in order to prevent excessive urea nitrate from being generated in the granulation process, ammonia gas is directly introduced into the material layer of a rotor drum granulator to finish the ammoniation treatment of ammonium nitrate phosphate and control the quantity of the urea nitrate generated in the reaction. The fertilizer not only can improve the utilization rate of fertilizer nutrients and ensure the whole-process nutrient supply of crops so as to increase the yield of the crops and improve the quality, but also can avoid harm caused by escherichia coli and such toxic substances as heavy metal, improve the soil, reduce the soil salinity and fertilize the land.

The invention relates to the technical field of civil engineering, and especially relates to a composite steel pipe UHPC damping column pier. The composite steel pipe UHPC damping column pier is composed of an external steel pipe, an internal steel pipe, an UHPC layer and a rubber concrete layer; the internal steel pipe is sleeved in the external steel pipe, a part between the inner wall of the external steel pipe and the outer wall of the internal steel pipe is filled with the UHPC layer, and an internal part of the internal steel pipe is filled with the rubber concrete layer. The composite steel pipe UHPC damping column pier uses the advantages of steel pipe, UHPC and the rubber concrete, can better solve the anticorrosion problem of the steel pipe concrete, increases the endurance of amember, reduces the life-cycle cost of the member, and prolongs the life period of the member; the damping column pier has the advantages of energy saving and environmental protection, accords with continuous development requirement of green building idea and building industry; the member has the advantages of large carrying capacity reserve, good ductility, seismic performance and fatigue resistance, excellent shock resistance, and good damping performance, and has excellent seismic performance and good damping capability.

The invention belongs to the technical field of the concrete and in particular relates to a low-chloride ion high-performance concrete. The low-chloride ion high-performance concrete is prepared from the following raw materials in parts by weight: 280-360 parts of cement containing 0.005% of chloride ions, 30-50 parts of silica fume containing 0.018% of chloride ions, 70-115 parts of coal ash containing 0.005% of chloride ions, 70-120 parts of mineral powder containing 0.007% of chloride ions, 155-165 parts of water, 660-775 parts of sand containing 0.007% of chloride ions, 976-1098 parts of broken stone containing 0.001% of chloride ions, and 7.50-9.65 parts of water reducing agent containing 0.03% of chloride ions. The total content of chloride ions in the concrete provided by the invention is controlled within the range from 0.015% to 0.018%; and the concrete has the advantages of high workability, high strength and high durability; besides, the strength of the concrete is in the range from C50 to C65.

The invention belongs to the technical field of concrete admixtures in chemical building materials, and particularly relates to a preparation method of a grafted copolymer and an air-entraining and slump-retaining polycarboxylate concrete water reducer. The air-entraining and slump-retaining polycarboxylate air-entrained concrete efficient water reducer is synthesized by the following steps: introducing a double bond in the process of preparing a macromonomer with reaction activity through utilization of polyoxyalkylene ether monomers; copolymerizing a product obtained from the former step and carboxylic acid monomers and allylsulfonate monomers in a solution so as to introduce a long side chain. The preparation technology is very simple; the reaction condition is easy to control; industrial three wastes are not generated in the production process; the solvent can be recycled after being recovered; and the solvent recovery rate reaches 98%-100%, so that the economic benefits are ensured; and the environmental pollution is avoided.

The invention discloses a method for removing alkaline dross chloride ions through surfactant. The method comprises the following steps of after alkaline dross, the surfactant and water are mixed according to the mass ratio of 50: (1-10): (150-300), stirring the materials completely till uniform slurry is obtained; then, conducting filter pressing through a filter press, so that filter cakes are obtained; and conducting drying, so that dechlorinated alkaline dross is obtained, and removal of the chloride ions in the alkaline dross is completed. The method for removing the alkaline dross chloride ions is simple in process and good in effect; energy is saved, and environment protection is achieved; the surfactant is mixed to the alkaline dross, so that an agglomeration structure in the alkaline dross is destroyed, and thus the accumulation volume of the alkaline dross is reduced; after filter pressing is completed, the content of the chloride ions in the alkaline dross is further lowered; the obtained dechlorinated alkaline dross can be massively applied to building materials, and thus the problem of alkaline dross disposal is effectively solved; and the problem that the alkaline dross cannot be regenerated and reused on a large-scale can be solved conveniently.

The invention relates to the field of sewage treatment, in particular to a method of continuously removing chloride ions from circulating water for water-quenched slag at low cost. The method comprises the steps of: step 1: recovering aluminum from waterworks sludge for treatment to prepare aluminum hydroxide as an aluminum source, and taking calcium oxide or calcium hydroxide as a calcium source,step 2: calculating a total amount of chloride ions in the water and dosage of calcium and aluminum agents according to a measured chloride ion concentration of the circulating water for the water-quenched slag, step 3: adding the agents into the circulating water for the water-quenched slag, performing stirring for reaction, standing and filtration, and detecting a chloride ion content in the circulating water after the filtration, step 4: feeding carbon dioxide to regulate a pH (potential of hydrogen) of the circulating water to be less than 8.5. The treated circulating water can be used for secondary dechloridation or dechloridation for many times; conditions are completely referred to the above steps; after the continuous dechloridation, water quality reaches the standard; and the circulating water can be used for circular water quenching. The method makes full use of renewable resources and is energy-saving, environmentally friendly and high in treatment efficiency, and the agents are cheap and easy to obtain.