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Combined preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black

A technology of nano-calcium carbonate and pseudo-boehmite, which is applied in the direction of calcium carbonate/strontium/barium, nanotechnology, nanotechnology, etc., can solve the problem of demanding gas influx and pH value control and affecting the nucleation of white carbon black and growth, reaction conditions are not easy to control, etc., to overcome the harsh reaction conditions, easy industrial production, and low price

Pending Publication Date: 2021-04-27
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Precipitated white carbon black is favored by people because of its mild reaction conditions, simple production technology and low cost. However, the product has a small specific surface area, a large particle size, and a large number of hydroxyl groups on the surface, which is easy to form aggregates. A large amount of sodium salt wastewater will be produced
The carbon dioxide precipitation method does not need to use strong acid and is the lowest cost process route. However, this method belongs to the gas-liquid two-phase reaction, the reaction rate is slow, and it is easy to cause uneven mixing of raw materials. The nucleation and growth of black will seriously affect the quality of the product, and the utilization rate of carbon dioxide is low and the loss is large
[0006] At present, the production of pseudo-boehmite and nano-silica is faced with problems such as difficult control of reaction conditions, unstable product quality, and discharge of large amounts of sodium salt wastewater. Therefore, it is necessary to develop new preparation technologies with controllable conditions, low energy consumption, and green environmental protection. The new process is of great significance to the sustainable development of the pseudo-boehmite and silica industries

Method used

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  • Combined preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black
  • Combined preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black
  • Combined preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Step A: Weigh 106 grams of Na 2 CO 3 , added to deionized water to prepare Na with a concentration of 1mol / L 2 CO 3 solution, then to Na 2 CO 3 CO was introduced into the solution 2 gas to CO in solution 2 reaches saturation and obtains CO 2 saturated NaHCO 3 solution.

[0037] Step B: Take 0.5L of the NaHCO prepared in Step A 3 solution, weigh 5 g of sodium dodecyl sulfonate and add to NaHCO 3 solution and stir evenly; weigh 74 grams of Ca(OH) 2 Add to 600 grams of deionized water and grind for 5 minutes with a colloid mill to obtain Ca(OH) 2 slurry, NaHCO 3 Solution with Ca(OH) 2 The slurry was added to a colloid mill and ground for 6 minutes to obtain a nano-calcium carbonate slurry. The slurry was crystallized at 90°C for 1 hour, the precipitate was filtered, washed 6 times with deionized water, and then dried in an oven at 100°C for 3 hours, get nano CaCO 3 product. The NaOH mother liquor is reserved for future use, and the washing solution is store...

Embodiment 2

[0041] Step A: Take 0.5L of the Na obtained in Step 1 D 2 CO 3 mother liquor, into CO 2 gas to CO in solution 2 reaches saturation and obtains CO 2 saturated NaHCO 3 solution.

[0042] Step B: Take 0.25L of the NaHCO prepared in Step A 3 solution, weigh 5 g of sodium dodecylbenzenesulfonate and add to NaHCO 3 solution and stir evenly; weigh 37 grams of Ca(OH) 2 Add to 200 grams of deionized water and grind for 8 minutes with a colloid mill to obtain Ca(OH) 2 slurry, NaHCO 3 Solution with Ca(OH) 2 Add the slurry to the colloid mill at the same time and grind it for 10 minutes to obtain a nano-calcium carbonate slurry, and place it at 50°C for crystallization for 1 hour, filter the precipitate, wash it with the NaOH lotion in Example 1, and finally use deionized water Wash once, then dry in an oven at 95°C for 6 hours to obtain nano-CaCO 3 product. The NaOH mother liquor is reserved for future use, and the washing solution is stored in sequence according to the washi...

Embodiment 3

[0046] Step A: Weigh 159 grams of Na 2 CO 3 , added to deionized water to make Na with a concentration of 1.5mol / L 2 CO 3 solution, then to Na 2 CO 3 CO was introduced into the solution 2 gas to CO in solution 2 reaches saturation and obtains CO 2 saturated NaHCO 3 solution.

[0047] Step B: Take 0.5L of the NaHCO prepared in Step A 3 solution, weigh 10 g of polyacrylamide and add to NaHCO 3 solution and stir evenly; weigh 111 grams of Ca(OH) 2 Add to 1000 grams of deionized water and grind for 10 minutes with a colloid mill to obtain Ca(OH) 2 slurry, NaHCO 3 Solution with Ca(OH) 2 Add the slurry to a colloid mill at the same time and grind it for 10 minutes to obtain a nano-calcium carbonate slurry, and crystallize it at 50°C for 2 hours, filter the precipitate, wash it with deionized water 6 times, and then dry it in an oven at 120°C for 2 hours. get nano CaCO 3 product. The NaOH mother liquor is reserved for future use, and the washing solution can be reused...

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Abstract

The invention discloses a combined preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black. According to the method, an aluminum source, a silicon source, Ca (OH) 2 and CO2 are used as raw materials, nano calcium carbonate and pseudo-boehmite or white carbon black are jointly prepared through a step-by-step cascade reaction, and a byproduct Na2CO3 is recycled. In the preparation process of the nano calcium carbonate, Ca (OH) 2 slurry and a CO2 saturated NaHCO3 solution are forced to be microscopically mixed by virtue of high shearing force of a colloid mill, so that the mixing efficiency is greatly improved, agglomeration of the nano calcium carbonate is inhibited, and a NaAlO2 or Na2SiO3 solution is prepared by reaction of a byproduct NaOH and an aluminum source or a silicon source. NaAlO2 or Na2SiO3 is reacted with a CO2 saturated NaHCO3 solution to prepare the nano pseudo-boehmite or white carbon black. The method realizes 100% utilization of reaction raw materials, has mild reaction conditions, is green and environment-friendly, has low production cost and is easy for industrial production.

Description

[0001] Field [0002] The invention relates to the field of preparation of inorganic non-metallic functional materials, in particular to a joint preparation method of nano calcium carbonate and pseudo-boehmite or white carbon black. Background technique [0003] Pseudoboehmite is a kind of boehmite with incomplete crystallization and special spatial network structure. It has physical properties such as high specific surface area, large pore volume and chemical properties of peptization and thixotropy under acidic conditions. These excellent properties of pseudo-boehmite make it widely used as a catalyst, carrier, binder, washcoat, flame retardant, and adsorbent in the petroleum industry, automobile industry, fire protection field, paper industry, environmental protection industry, and construction industry. used in many fields. Nano-silica is a non-toxic, odorless, white silicon dioxide powder, which has the advantages of chemical inertness, high electrical insulation, large ...

Claims

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Application Information

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IPC IPC(8): C01F11/18C01F7/02C01B33/18B82Y30/00B82Y40/00
CPCC01F11/181C01F7/02C01B33/18B82Y30/00B82Y40/00C01P2002/72C01P2004/03C01P2004/64
Inventor 唐平贵李殿卿冯拥军
Owner BEIJING UNIV OF CHEM TECH
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