Electroplating sludge resource utilization method

Abstract

An electroplating sludge resource utilization method comprises the following steps: (1) pretreatment: separating heavy metal elements from electroplating sludge by a wet process, and neutralizing the electroplating sludge with lime or limestone, to obtain an electroplating sludge waste residue with calcium sulphate dihydrate as a main component; (2) preparation of raw material: replacing all gypsum and all iron raw materials in raw material ingredients with the electroplating sludge waste residue, or replacing a part of gypsum and a part of iron raw materials with the electroplating sludge waste residue, then blending with gypsum and vanadine, and powder-grinding to prepare the raw material for producing a calcium sulphoaluminate or calcium sulphoferrate clinker; and (3) baking for 0.5-1 h at the temperature of 1250-1400 DEG C. The electroplating sludge is used as the raw material containing polymetal and is subjected to resource utilization to produce two kinds of materials, namely a corresponding metal and / or metal salt material and a gypsum-based building material, so the problem of pollution in electroplating industry is facilitated to be solved, and the implementation of circular economy development is facilitated.

Description

technical field [0001] The invention relates to the field of environmental protection and waste utilization, in particular to a resource utilization method of electroplating sludge. Background technique [0002] The electroplating industry is one of the three major polluting industries in the world today, and it is also an important basic processing industry in my country. The electroplating sludge generated during the electroplating process enriches almost all the elements in the electroplating wastewater, including harmful heavy metals, and the conventional compound components in the electroplating sludge Mainly include: CaO, SO 3 、Al 2 o 3 , Fe 2 o 3 , CuO , NiO, ZnO, CdO, CrO, SiO 2 、Na 2 O, MgO, Co 2 o 4 , SrO, Nb 2 o 5 , ZrO 2 , PbO, HgO, etc. and some anions, among which copper, nickel, chromium and other heavy metals are mainly hydroxide precipitates. Most electroplating sludge mainly contains chromium, iron, nickel, copper, zinc and other heavy meta...

AI Technical Summary

Problems solved by technology

[0031] In summary, although the resource utilization of electroplating sludge has always been a research hotspot at home and abroad, many scientific research institutions and enterprises have conducted a lot of research on the recycling of valuable metals in electroplating sludge and the harmless resource treatment. However, most of them are in the laboratory stage or demonstration. Although there are relatively mature wet process (hydrometallurgy) and thermochemical (pyrometallurgy) valuable metal recovery technologies, the process of fully recovering valuable metals in electroplating sludge Technically, there are still problems such as high cost, complicated operation, and low purity of the recovered products, and the processing volume is small, the cost is high, and there are problems of ultimate disposal of sludge and waste residue or secondary pollution, resulting in electroplating, one of the three major pollution sources in the world. The problem of industrial pollution has not been solved. For this reason, there is an urgent need for a method that can use electroplating sludge as a raw material, which can not only use existing mature methods, but also extract most of the valuable metals economically, and recycle the electroplating sludge. A New Method of Recycling All Components of Mud