96results about How to "The process is green and environmentally friendly" patented technology

The invention discloses a process for preparing high-purity ultrafine magnesium hydroxide by a sodium hydroxide method; by using a crystal seed decomposition method, purified brine and crystal seed of the magnesium hydroxide are added to a reaction pool to be mixed and temperature is kept at 60-80 DEG C; then solution of the sodium hydroxide is added to the reaction pool to carry out the precipitation reaction, crystallization and aging; after the reaction is finished, slurry of the magnesium hydroxide is filtered and washed; cake after filter is dried and crashed, the crystal product of the magnesium hydroxide is obtained. Compared with the prior art, the process for preparing the high-purity ultrafine magnesium hydroxide accelerates agglomeration and growth of the magnesium hydroxide crystal by adding the crystal seed, solves the problem of the difficulty for filtering and washing the filter cake by using the prior sodium hydroxide method to produce the magnesium hydroxide, and directly utilizes the slurry of the magnesium hydroxide generated by the reaction as the crystal seed to carry out cyclic decomposition. The process flow is simple and the process parameter can be easily controlled. The production process is pro-environment without producing pollutant. At the same time, the purity of the magnesium hydroxide obtained by the process and the recovery rate of the magnesium are very high; furthermore, the purity of the by-product sodium chloride is high. The process for producing the magnesium hydroxide has great development prospect.

The present invention relates to pore forming agent, and is especially pore forming agent for porous magnesium alloy and porous aluminum alloy and with controllable pore size, porosity and pore wall thickness and its preparation process and pore forming method. The pore forming agent is prepared with light calcium carbonate, RE carbonate, etc as material and through an extruding and pelletizing process. When it is used, the granular pore forming agent is used as the support and molten magnesium alloy or aluminum alloy is made to seepage flow into the pore forming agent so as to obtain porous magnesium alloy or aluminum alloy after treatment. The porous magnesium alloy and aluminum alloy preparing process can control the pore size, porosity and pore wall thickness effectively, and the alloy is used for sea water cell anode, metal rubber and other porous light metal product.

The invention relates to a technological method for extracting and separating quadrivalent cerium, thorium, and less-cerium trivalent rare-earth from rare earth sulfate solution. The rare earth sulfate solution, which is obtained through processing the rare-earth ores and contains the thorium and high-valence cerium, is used as raw material; synergistic extraction agent basing on P507 and P204 is adopted for extracting and separating; the cerium (4) and the thorium are extracted into an organic phase, then selective washing and back extraction are performed step by step to obtain the products including pure cerium and pure thorium, the trivalent rare-earth is left in a water phase, and then unsaponifiable P507 or the synergistic extraction agent basing on P507 is adopted to perform multistage fractional extraction to separate single rare earth elements after impurity removal. The technological methodn has the characteristics that the synergistic extraction agent basing on P507 and P204 is adopted, the thorium is easy to perform the back extraction, and extraction capacity is large, and the emulsification is not generated during the extraction process; the cerium (4), the thorium and trivalent rare-earth are extracted and separated in the same extraction system; both extraction and the separation adopt unsaponifiable extraction agent, and ammonia-nitrogen wastewater is not generated; in addition, the thorium is recovered as products, and the pollutions caused by thorium-containing waste residue and the ammonia-nitrogen containing wastewater are eliminated from headstream. Therefore, the technological method has the advantages of simple procedures, green environmental protection, and low manufacturing cost.

The invention provides a carbon dioxide sorbent based on ordered mesoporous carbon and a preparation method. According to the preparation method, ordered mesoporous carbon is synthesized according to a solvent evaporation-induced self assembly (EISA) method, and supported polyethylene imine (PEI) modification is performed on ordered mesoporous carbon according to an impregnation method, so as to improve the hydrophobicity of the novel sorbent. The sorbent obtained according to the preparation method is uniform in pore size distribution and very high in orderliness; the sorbent adopts the structure of ordered mesoporous carbon, so that the heat stability is relatively high; the carbon dioxide adsorbing capacity of the sorbent and the hydrophobicity are relatively high. Therefore, based on such properties, the sorbent not only can adapt to a high-humidity environment, but also can be applied to an adsorbing process of which the temperature is above normal; meanwhile, the renewability is high, no pollutant is generated in the preparation process, and the technological process is environmentally friendly.

The invention discloses a Sn-Sb-Zn composite heat stabilizer for polyvinyl chloride (PVC) sheets. The Sn-Sb-Zn composite heat stabilizer comprises, by weight, 10-20 parts of thioglycolic acid methyl tin, 40-60 parts of thioglycolic acetic ester antimony and 5-15 parts of organic acid zinc salt. The invention further discloses the preparation method of the Sn-Sb-Zn composite heat stabilizer and application of the Sn-Sb-Zn composite heat stabilizer as a PVC stabilizer. The composite heat stabilizer is high in product quality, low in toxicity, environment-friendly, less in tin content in a formula and applicable to various PVC hard sheet materials, has good initial and long-term heat stability, and is high in product transparency.

The invention relates to an absorption oil-gas recycling system and an absorption oil-gas recycling process. The system comprises an absorption device, a desorption device, an intake device and a storage device, which are connected with one another. The absorption device and the desorption device are more first-staged. By the absorption oil-gas recycling system, the recycling process by combining multistage absorption and desorption is achieved, the problems of pollution and waste of hydrocarbon components in oil and gas are solved, external environment is protected effectively, and energy is utilized efficiently and economically. The absorption oil-gas recycling system is suitable for popularization and application in related oil-gas recycling fields, especially suitable for fields such as lean oil recycling and reusing and crude oil-gas recycling and reusing.

The invention relates to a water-purifying process and water-purifying equipment thereof. Tap water is treated into flushing water, clean water and direct drinking water in a grading and classifying manner as required through a first-stage purification treatment device, a second-stage purification treatment device and a third-stage purification treatment device which are connected in sequence from bottom to top. By adopting the water-purifying process and the water-purifying equipment, water resources are utilized more optionally and reasonably, the problems of secondary pollution and the like since heavy metal pollutants in tap water cannot be removed in an efficient and environment-friendly way in the prior art are solved effectively, heavy metal ions, residual chlorine and other harmful particles in tap water are removed efficiently, bacteria are killed, the water quality is improved, sewage is disposed automatically, and the water yield and the utilization ratio of water are increased greatly; the health of a user is ensured; tap water is classified and treated effectively and is utilized in a shunting way according to the water quality, water amount and water pressure requirements of household water, and water is saved; energy is saved efficiently, space is saved, and remarkable energy-saving and environmental protection effects are achieved. The water-purifying process and the water-purifying equipment are suitable to be popularized and applied in relevant tap water treatment field.

The invention discloses a preparation method of cotton bast fiber and chitosan composite nonwoven fabric for filtering, and belongs to the technical field of fiber materials. Cotton bast is separatedthrough steam flash-explosion pretreatment, formation is conducted by a papermaking method, and chitosan is added to enhance the mechanical property and the filtering efficiency. The preparation method is simple, convenient and environment-friendly in process flow and adapts to industrialized production. The nonwoven fabric adopts lignin-enriched cotton bast fiber and chitosan as raw materials, sothat the nonwoven fabric has high antibacterial property. The cotton bast and the chitosan are biology-based materials and can be degraded in the natural environment after use, so that environmentalburden is reduced and the problem that the electrostatic spinning method is difficult in industrialized and mass production is solved.

The invention discloses a comprehensive treatment process for high-temperature removed dust. The process is used for thermally pressing the high-temperature removed dust to form hot removed dust press blocks by effectively using massive physical heat of dry high-temperature removed dust and easy forming property of a high-temperature material. The hot removed dust press block product provides a hot raw material for the subsequent process, and is added into a final reduction furnace or a pre-reduction furnace in a two-step smelting reduction process or added into a blast furnace after being cooled in use, so that the energy consumption of the subsequent process is effectively reduced. Meanwhile, the process links of cooling the hot removed dust, mixing, adding adhesive, pelletizing and the like in the conventional dust treatment flow are canceled in the hot removed dust press block process, so the process flow has predominant effects of saving energy, protecting environment, reducing cost, increasing comprehensive benefit and the like.

The invention discloses an improved method for recovering methanol from methanol rectification purge gas. According to the invention, a purge gas washing tower and a pre-tower reflux tank are employed, gas at top of a pre-tower at a rectification section passes through two-stage condensation, a light component purge gas after condensation is introduced into the purge gas washing tower; deionized water is introduced as an extraction washing agent for circularly extracting and washing, and centrifugation and gravity self-separating auxiliary equipment and a separator plate are employed at a column reactor segment for standing, extracting, separating light oil and methanol. The method can extract and recover methanol, solves the problem of discharge of noncondensable gas after the environmental protection standard is increased, and has the advantages of concise process, less equipment investment, and easy operation.

The invention provides a manufacturing process of bamboo woven products, comprising the following steps: preparing a plant dyeing agent; S2: soaking the bamboo to be dyed in the plant dyeing agent; ‑48 hours; take out the bamboo to be dyed after step S2, and wash it with 22°C water; place the bamboo to be dyed after step S3 to dry in the shade at 22°C for 24‑48 hours; repeat step S2‑S4, at least More than two times, a semi-finished product is obtained; the surface of the semi-finished product is evenly brushed with wood wax oil to obtain a finished product. The manufacturing process of a bamboo woven product provided by the present invention does not destroy the internal fiber structure of bamboo through low-temperature production, reduces the risk of cracking and deformation of bamboo, is more conducive to dyeing fastness, and dyes and fades more uniformly. Then use wood wax oil to protect the outer surface of bamboo to reduce the problem of dye fading. And the use of plant dyeing, the entire process is environmentally friendly and will not produce harmful substances to the human body.

A method for recycling and reusing waste power battery belongs to that field of recycling waste battery. The battery is completely discharged and placed under a sealed and protective gas atmosphere, and the battery pole head, the shell and the battery cell are collected by cold cutting; the obtained cell is immersed and cleaned in the replacement solution. And the positive electrode, the negativeelectrode and the diaphragm are separated by unwinding; The positive and negative electrode pieces are respectively soaked in distilled water and ultrasonicated to obtain positive and negative electrode materials, aluminum foil and copper foil; The electrolyte volatile in the process of cell disassembly is absorbed by absorption tower. Distillation, condensation, filtration and drying are used forrecycling of the replacement liquid used in the cell immersion process, and the harmful substances are recovered through a neutralization sedimentation tank and a tail gas absorption tank. The ultrasonic liquid is recycled after being precipitated by adding demulsifier, filtered and treated by biological contact oxidation. The invention realizes the recovery and regeneration of the waste lithiumion battery, the process is safe, harmless, the automation degree is high, the treatment is efficient and convenient, and the secondary pollution to the environment is not generated.

The invention provides a modified aramid fiber pulp with an average length of 5-8 mm, wherein the modified aramid fiber pulp is a modified aramid fiber pulp containing an imidazole ionic liquid. The invention further provides a preparation method of the modified aramid fiber pulp, wherein mainly steam blasting treatment, imidazole ionic liquid spraying treatment, fluidized bed airflow mill dry grinding and other processes are performed to prepare the modified aramid fiber pulp, the method has characteristics of short process, low energy consumption, no solvent and environment protection, and the prepared modified aramid fiber pulp has characteristics of high fibrillation degree, rich hairiness and large specific surface area. According to the present invention, with the application of the modified aramid fiber pulp as the reinforcing material to produce the brake lining and other friction materials, the strength, the toughness and the heat resistance of the brake lining are improved, the preparation formula does not contain asbestos, and the green environment protection advantage is provided.

The invention discloses a combined integrated water injection well plug removal process method, and relates to the technical field of oil production engineering. The technical problem that the existing well washing method can not guarantee the unblocking of a shaft and is prone to causing secondary plugging due to corrosion. The process method comprises the following steps that S1, inorganic plugremoval agents are pumped into the well, and the well is shut for 12-24 hours; S2, a rotary scraper is used for scraping from a wellhead to the bottom of the well; S3, a skid-mounted filter well-washing truck on the ground is used for circularly washing the well, and fine particles after dispersing and dissolving are filtered into the skid-mounted filter well-washing truck; S4, the inorganic plugremover agents are circulated into the well; and S5: the well is opened, water is injected, and a water injection system is used for removing the plug of a stratum. The process is safe, environment friendly and reasonable, and does not produce waste liquids, no corrosion exists, the compatibility is good, and the plug of the shaft is removed while the plug of the stratum is removed.

The invention discloses a nickel-containing electroplating wastewater treatment method which comprises the following steps: putting nickel-containing electroplating wastewater into a stirring tank, and stirring with an electric stirring machine; putting a precipitator into the stirring tank; further putting a settling agent into the stirring tank; further putting a composite water purifier into the stirring tank, and increasing a stirring speed for a certain time; further putting a polymeric flocculant into the stirring tank, and reducing the stirring speed for a certain time; introducing obtained wastewater into the settling tank, and performing precipitation so as to obtain precipitated sludge; filtering and drying the precipitated sludge; dissolving the dried sludge into dilute sulfuric acid so as to obtain a primary solution; extracting the primary solution so as to obtain an extract; performing reverse extraction on the extract so as to obtain a reverse extract; electrolyzing the reverse extract, thereby obtaining metal nickel. The method is environmentally friendly in process procedure, low in energy consumption, high in heavy metal recycling rate, low in overall production cost and easy in industrial on-scale production.

The invention relates to an oil-gas recycling system and an oil-gas recycling process. The system comprises a gas-liquid separation device, an absorption intake separation device, an intake separation device and a storage device. The storage device is connected with the gas-liquid separation device and the intake separation device respectively. The gas-liquid separation device is connected with the intake separation device which is connected with the absorption intake separation device. The absorption intake separation device is above first stage. The intake separation device is also above first stage. By the oil-gas recycling system, combination of multiple separation techniques is achieved, the recycling process by combining multistage intake and absorption intake is achieved, hydrocarbon components in oil and gas can be recycled completely and thoroughly, and energy waste is avoided. The oil-gas recycling system is evident in environment protection effect, low in economic cost, convenient and safe to operate, and suitable for popularization and application in related hydrocarbon-contained oil-gas recycling fields.