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A method for solidifying and stabilizing apatite containing chrome leather shavings

A technology of chromium leather shavings and apatite, which is applied in the field of solidification and stabilization of apatite containing chromium leather shavings, to achieve good biocompatibility and prevent metal leakage

Active Publication Date: 2021-03-23
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The object of the present invention is to provide a method for solidifying and stabilizing apatite containing chromium-containing leather shavings, aiming at solving the existing waste treatment method for chromium-containing leather shavings

Method used

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  • A method for solidifying and stabilizing apatite containing chrome leather shavings
  • A method for solidifying and stabilizing apatite containing chrome leather shavings
  • A method for solidifying and stabilizing apatite containing chrome leather shavings

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] In a horizontal mixer, add 100 parts of Cr containing 2 o 3 =1.55% leather shavings, 20 parts of water, 5 parts of ferrous sulfate 7 hydrate, 15 parts of Ca(OH) with a ratio of Ca / P of 2.0 2 with Na 2 HPO 4The mixture was heated to 35°C, stirred for 30 minutes, adjusted to pH = 9.0-10.0 with 20% NaOH solution, stirred for 30 minutes, pressed into a fixed shape with a 10t packing machine, placed in a sintering furnace (high temperature furnace), filled with nitrogen for 5 minutes, and heated up Heat to 100°C, keep warm for 30-40 minutes, then raise the temperature to 500-550°C, keep warm for 40 minutes, take out of the oven, cool to room temperature, and crush into particles as inorganic-organic composite hardening materials, suitable for soil landfill, cement floor tile filler or plastic floor filler .

[0032] After sintering, the pulverized particles are determined by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299—2007) (pH...

Embodiment 2

[0034] In a horizontal mixer, add 100 parts of Cr containing 2 o 3 =2.72% leather shavings, 30 parts of water, 7 parts of ferrous sulfate heptahydrate, 15 parts of CaCl with a ratio of Ca / P of 4.0 2 with NaH 2 PO 4 The mixture was heated to 35°C, stirred for 30 minutes, adjusted to pH = 9.0 with 20% NaOH solution, stirred for 30 minutes, pressed into a fixed shape with a 10t packing machine, placed in a sintering furnace (high temperature furnace), filled with nitrogen for 5 minutes, and heated to 100 ℃, keep warm for 40 minutes, then raise the temperature to 400-450 ℃, keep warm for 60 minutes, take it out of the oven, cool to room temperature, crush it into granules as inorganic-organic composite hardening material, suitable for soil landfill, cement floor tile filler or plastic floor filler.

[0035] After sintering, the pulverized particles are determined by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299—2007) (pH=3.20±0.05) to m...

Embodiment 3

[0037] In a horizontal mixer, add 100 parts of Cr containing 2 o 3 =2.22% leather shavings, 30 parts of water, 6 parts of ferrous sulfate 7 hydrates, 12 parts of Ca(NO 3 ) 2 with NaH 2 PO 4 The mixture was heated to 35°C, stirred for 30 minutes, adjusted to pH = 10.0 with 20% NaOH solution, stirred for 30 minutes, pressed into a fixed shape with a 10t packing machine, placed in a sintering furnace (high temperature furnace), filled with nitrogen for 5 minutes, and heated to 120 ℃, keep warm for 40 minutes, then raise the temperature to 450-500 ℃, keep warm for 60 minutes, take it out of the oven, cool to room temperature, and crush it into granules as inorganic-organic composite hardening material, suitable for soil landfill, cement floor tile filler or plastic floor filler.

[0038] After sintering, the pulverized particles are determined by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299—2007) (pH=3.20±0.05) to measure the total Cr...

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Abstract

The invention discloses a method for solidifying and stabilizing apatite containing chrome leather shavings. The method for solidifying and stabilizing apatite containing chromium leather shavings uses hydroxyapatite to be placed in a sintering furnace to form a high degree of collagen and chromium ions. Mineralize the product to prepare a solid mineralized material containing chromium salts; fill the sintering furnace with nitrogen for 5 minutes, raise the temperature to 100-120°C, keep it for 30-40 minutes, then raise the temperature to 400-600°C, and keep it for 30-60 minutes. After the sintering of the present invention, the pulverized particles are measured by "Solid Waste Leaching Toxic Leaching Method Sulfuric Acid Nitric Acid Method" (HJ / T 299-2007) (pH=3.20±0.05) to measure the total Cr content≤15mg / kg, Cr(VI) content≤0.5mg / kg.

Description

technical field [0001] The invention belongs to the technical field of apatite solidification and stabilization, and in particular relates to a method for solidification and stabilization of apatite containing chromium leather scraps. Background technique [0002] Solidification / stabilization technology is one of the main methods for dealing with toxic and hazardous wastes in the world, and solidification / stabilization of sludge is a material that has been studied more in the treatment of toxic and hazardous wastes at home and abroad in the past 20 years. The US EPA calls solidification of cement-based materials the best technology for disposing of toxic and hazardous waste. The core of this technology is to mix waste and cement, and form a hard cement solidified body after hydration reaction, so as to achieve the purpose of reducing the leaching of hazardous components in waste. Tannery waste chromium-containing leather scraps come from the residual lower corners of raw hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A62D3/33A62D101/43
CPCA62D3/33A62D2101/43
Inventor 单志华杨建根张一炜邓航霞陈慧
Owner SICHUAN UNIV