53results about How to "Small increase ratio" patented technology

The invention discloses a solidification treatment method for sludge of urban sewage plants. The method comprises the following steps of (1) adding curing agent consisting of lime, sulfate aluminum cement, portland cement and fly ash in dehydrated sludge based on the weight of the dehydrated sludge, wherein the weight percentage of lime, sulfate aluminum cement, portland cement and fly ash in the curing agent are as follows: 1.2-1.9% of lime, 3.0-6.1% of sulfate aluminum cement, 3.0-3.7% of portland cement and 4.7-6.0% of fly ash; and (2) mixing the sludge added with the curing agent to form precursors of solidified blocks, piling the precursors up according to a height of 7 cm, and covering with waterproof membrane, maintaining the precursors for three days with a dry maintaining method, and forming sludge solidified blocks. The method provided by the invention has the advantages of efficiency, low cost, simple operation and the like.

The invention discloses a steel slag-desulfurized gypsum based soil solidification agent applicable to arsenic contaminated soil. The soil solidification agent contains the ingredients in percentage by weight: 40% to 45% of steel slag, 15% to 25% of desulfurized gypsum, 22% to 30% of slag, 7% to 10% of cement clinker and 3% of excitant. According to the soil solidification agent disclosed by the invention, arsenic is solidified and stabilized mainly by means of chemical wrapping and in-phase replaced solidifying, and the age of a solidifying reaction can be shortened and the mixed amount of the solidification agent and solidified volume increase ratio in engineering applications can be lowered while a solidifying effect is guaranteed, so that the solidifying efficiency is increased greatly.

The invention provides an arsenious waste curing method. The arsenious waste curing method comprises the following steps of: (1) grinding arsenious waste into powder, adding into iron, boron and phosphorous basic glass ingredients and a stabilizer, and uniformly mixing raw materials and drying; and (2) placing the dried raw materials into a stainless steel mould, heating to 400-500 DEG C at a constant speed within 0.8-1.2 hours, and insulating for 1-2 hours, wherein intensity of pressure in the stainless steel mould is maintained to be 10-12Mpa all the time in the heating process; and founding, homogenizing, then carrying out natural cooling to room temperature, taking out the mould, and demoulding, thus the solid arsenic crystal product is obtained. The invention also provides a solid arsenic crystal product generated by the arsenious waste curing method. Arsenic curing rate of the arsenious waste curing method is high, and the produced cured product can be used for making a building or decorative material.

The invention provides a solidification and stabilization method for mercury in mercury contaminants. The method includes the following steps that (1) mercury contaminant particles with the grain diameter not larger than 5 mm are mixed with soluble sulfide and water, and a first mixture is obtained; (2) the first mixture, cement and water are stirred and mixed, the stirring speed ranges from 20 r/min to 40 r/min, and a second mixture is obtained; and (3), after the second mixture is placed, the treated mercury contaminants are obtained. According to the method, the solidification effect of mercury in the contaminants is enhanced, the cement use amount is reduced on a large scale, the solidification capacity-increase ratio is small, and ready-made construction is rapid; and the leaching concentration of mercury after solidified bodies are stabilized for a long time is low, the mechanical strength of the solidified bodies can meet the requirements of ordinary road paving, and the solidification and stabilization method is suitable for mercury contamination repair projects with the large area, the tight schedule, the simple construction conditions and the low one-time invested cost requirement.

The invention relates to a method for solidifying-stabilizing bottom mud polluted by heavy metals by using cement and organic sulfides and application of an obtained solidified body. The method comprises the steps of adding aminodithioformic acid into the bottom mud polluted by heavy metals, stirring fully, adding cement, stirring the obtained mixture uniformly, and curing for 3d-14d to obtain the solidified body, so that a solidifying-stabilizing process is completed. The method has the advantages that the usage amount of the cement can be reduced, the cost is reduced, the capacity increasing rate of the solidified body is reduced, secondary pollution is avoided, the solidifying-stabilizing effect of the bottom mud polluted by heavy metals is improved, the cured solidified body can be used for landfill disposal or can serve as a building material.

The invention discloses a waste incineration fly ash heavy metal inorganic composite stabilizing agent which can reduce the treatment cost and is environmentally friendly and a stabilizing and curingmethod thereof. The waste incineration fly ash heavy metal inorganic composite stabilizing agent is prepared from ferrous sulfate, sodium dihydrogen phosphate, disodium hydrogen phosphate, potassium pyrophosphate, bentonite, kaolin, calcium oxide and calcium hydroxide, wherein the mass ratio of any two components is 1-5: 1. The stabilizing and curing method of the waste incineration fly ash heavymetal inorganic composite stabilizing agent comprises the following steps: S1, selecting components of the heavy metal inorganic composite stabilizing agent, and S2, stabilizing heavy metals in the waste incineration fly ash. The waste incineration fly ash heavy metal inorganic composite stabilizing agent and the stabilizing and curing method thereof are adopted, raw materials are easy to obtain,the dosage is small, the agent cost is low, the stabilizing/curing process is simple, a cured body is stable, good acid and alkali resistance is achieved, and secondary pollution to the environment isavoided. The stabilizing agent has a good curing effect on heavy metals in the household garbage incineration fly ash.

The invention discloses an aluminum base gelling and curing agent, which comprises calcium aluminate, sulfur aluminum cement and an early-strengthening coagulant aid, wherein the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5. The invention also discloses a preparation method of the above aluminum base gelling and curing agent. According to the method, the calcium aluminate, the sulfur aluminum cement and the early-strengthening coagulant aid, in the mass ratio of the above three parts is : (1-3) : (6.5-8.5) : 0.5, are ground, sieved, mixed and stacked up in a cone shape. After that, samples are pressed flat, and peripheral samples are stacked up centrad again in a cone shape and then pressed flat. So repeatedly for several times, and then the aluminum base gelling and curing agent can be obtained. The invention also discloses a method for treating the dredged sediment by means of the above aluminum base gelling and curing agent. Waste and gravels in the mud of the dredged sediment are separated, and then the cationic-type polyacrylamide is added to thicken and dehydrate the dredged sewage. After that, the aluminum base gelling and curing agent is added and mixed with the dredged sewage, and the mixture is stirred. Meanwhile, a water reducer is added and mixed uniformly with the above mixture. After the dehydration and solidification process, the obtained product is subjected to stabilization maintenance. The aluminum base gelling and curing agent is higher in economic, social and environmental benefits.

The invention relates to a method for preparing a chromium curing/stabilizing material, the chromium curing/stabilizing material prepared thereby and an application thereof. The method comprises the following steps of: uniformly mixing a silicon-aluminium mineral, calcium-magnesium mineral and an additive, and after high-temperature calcination at the temperature of 800-1600 DEG C, obtaining a calcinated material; then uniformly mixing the calcinated material, a stabilizer, a chromium precipitating agent and a viscosifier to obtain the chromium curing/stabilizing material. The chromium curing/stabilizing material can be used for curing/stabilizing chromium and controlling chromium pollution, and is especially used for remediation of soil polluted by the chromium.

The invention provides a stabilizing treatment method for beryllium-containing waste residues and belongs to the technical field of environment-friendly treatment of harmful substances. The method comprises the steps of wet grinding, diversified synthetic reaction, curing molding and the like. The leaching concentration of beryllium in the treated cured material is less than 0.2 mg/L and is lowerthan the control limit value of "Hazardous Waste Pollution Landfill Control Standard-GB18598-2019", and the cured material can be directly put in storage for safe landfilling. According to the method,the beryllium-containing waste residues are safely disposed, and the method has positive significance in ecological environment protection.

The invention relates to the technical field of hazardous waste disposal, and particularly relates to a method for stabilized solidification of mercury-containing waste salt slag by using petrochemical waste alkali slag. The method comprises the following steps that the mercury-containing waste salt slag and the petrochemical waste alkali slag are subjected to first-stage mixing and ball milling,and then an auxiliary stabilizer is added into a material obtained after first-stage mixing and ball milling, the mixture is subjected to second-stage mixing and ball milling; and 2) the material obtained in the step 1) is mixed with a solidifying material, and stirred to obtain a uniform bulk granular solidified material. By the adoption of the method, waste can be treated with waste, important economic, social and environmental benefits are achieved, and a novel method is provided for terminal harmless treatment of mercury-containing waste salt.

The invention discloses a method for stabilizing iron arsenate slag. The method comprises the following steps that (1), an iron-based stabilizer is added into the arsenic-containing waste residue, andmixing is carried out; (2), a reaction solution is added into the mixture, and stirring is carried out to prepare slurry; and (3), after the slurry is stirred under a certain condition, liquid-solidseparation is carried out, and the filtered product undergoes standing, air drying or drying dewatering, so that a stable product of the iron arsenate slag is obtained, and the filtrate is returned tothe reaction solution to be reused. The method has the advantages of being simple in process, easy to operate, low in auxiliary material cost, free of secondary pollution, small in capacity increasing ratio and the like; and the method can be directly applied to the final treatment and disposal of the iron arsenate slag.