Method for preparing chromate from oyster shells and tanning sludge

A technology of tanning sludge and oyster shells, applied in the environmental field, to achieve the effects of cost reduction, convenient operation and simple process

Pending Publication Date: 2021-12-21
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Due to the problems existing in the methods of the prior art, the present invention provides a method for producing chromate by treating waste by using waste oyster shells in the environment and chromium-containing sludge produced by the leather industry, and the method solves the problem of Effects of chromium-containing sludge on the environment

Method used

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  • Method for preparing chromate from oyster shells and tanning sludge
  • Method for preparing chromate from oyster shells and tanning sludge
  • Method for preparing chromate from oyster shells and tanning sludge

Examples

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Embodiment 1

[0036] A resource recovery method for preparing chromate from oyster shells and tannery sludge, which specifically includes the following steps:

[0037] (1) Precipitate the waste water produced in the chrome tanning process of the tanning industry with alkali. The concentration of chromium in the waste water is 4637mg / L. Sodium hydroxide is used for precipitation, and about 2.7g of sodium hydroxide is added to 1L of waste water. The precipitated chromium-containing sludge is dried in an oven at 60°C, crushed with a crusher, passed through a 100-mesh screen, and set aside for use.

[0038] (2) Crush the washed and air-dried oyster shells to a size of 3-5 cm, try not to damage the overall structure, and set aside.

[0039] (3) Put 100-mesh chromium-containing precipitate and 3-5cm oyster shells in a crucible at a mass ratio of 1:6, infiltrate with deionized water, and mix well.

[0040] (4) Put the homogeneously mixed chromium-containing sludge and oyster shells in a tubular m...

Embodiment 2

[0044] A resource recovery method for preparing chromate from oyster shells and tannery sludge, which specifically includes the following steps:

[0045] (1) Precipitate the waste water produced by the chrome tanning process in the tanning industry with alkali. The concentration of chromium in the waste water is 4637mg / L. Precipitate with sodium hydroxide, and add about 2.7g of sodium hydroxide to 1L of waste water. The precipitated chromium-containing sludge is dried in an oven at 60°C, crushed with a crusher, and passed through a 100-mesh screen for use.

[0046] (2) Crush the washed and air-dried oyster shells with a crusher, pass through a 100-mesh sieve, and set aside.

[0047] (3) Put 100 meshes of chromium-containing precipitate and oyster shell powder in a crucible at a mass ratio of 1:2, infiltrate with deionized water and mix evenly.

[0048] (4) Put the homogeneously mixed chromium-containing sludge and oyster shell powder in a tubular muffle furnace, react at 800°...

Embodiment 3

[0052] A resource recovery method for preparing chromate from oyster shells and tannery sludge, which specifically includes the following steps:

[0053] (1) Precipitate the waste water produced by the chrome tanning process in the tanning industry with alkali. The concentration of chromium in the waste water is 4637mg / L. Precipitate with sodium hydroxide, and add about 2.7g of sodium hydroxide to 1L of waste water. The precipitated chromium-containing sludge is dried in an oven at 60°C, crushed with a crusher, and passed through a 100-mesh screen for use.

[0054] (2) Crush the washed and air-dried oyster shells with a crusher, and place them in a tubular muffle furnace at 800 °C for 2 h at a heating rate of 10 °C / min to modify the oyster shells. The oyster shell biomass powder is passed through a 100-mesh sieve and set aside.

[0055] (3) Put 100 meshes of chromium-containing precipitate and oyster shell biomass powder in a mass ratio of 1:1 in a crucible, infiltrate with d...

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Abstract

The invention discloses a method for preparing chromate by utilizing oyster shells and tanning sludge, which is a recycling method for recycling chromium by utilizing precipitate obtained by adding alkali to precipitate tanning wastewater, belongs to a solid waste recycling technology in the field of environment, and relates to a recycling technology for treating solid polluted wastes and treating wastes with wastes; therefore, the chromium sludge hazardous waste is treated, and the oyster shells are high-valued and recycled. The method comprises the following steps: firstly, drying and grinding a chromium precipitate; secondly, waste oyster shells collected from the seafood market and the seaside are naturally air-dried and deodorized, and then modifying the oyster shells to destroy the structures of the oyster shells; thirdly, roasting the ground chromium precipitate and the oyster shells or the modified oyster shells in a muffle furnace to obtain a calcium chromate salt product, thereby realizing the recycling and reutilization of the chromium element in the tannery sludge and the waste oyster shells in the environment.

Description

technical field [0001] The present invention relates to the resource utilization technology of solid hazardous waste and domestic waste in the environmental field, and relates to the treatment of solid waste produced in the tanning industry and the recycling and resource recovery method of discarded oyster shells in the environment. Solid waste for resource recovery. Background technique [0002] Chromium salts are in great demand in the fields of electroplating, chrome tanning, and pigments, and the future development prospects are good. However, due to the small reserves of chromium in my country, chromium salts used in most industries need to be imported, which leads to high cost problems, while chromium-containing wastewater and The problem of waste residue is becoming more and more serious. If it is used to prepare chromate and reuse it in industries such as tanning, the problems of environmental pollution and waste of chromium resources can be solved. [0003] Chromium...

Claims

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Application Information

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IPC IPC(8): C01G37/14C02F1/52C02F11/13C02F101/22C02F103/24
CPCC01G37/14C02F1/52C02F11/13C02F2101/22C02F2103/24
Inventor 程扬健李鹏旭李洪正
Owner FUZHOU UNIV
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