A method for preparing sulphoaluminate cement by using cyanide tailings

Abstract

A method for preparing sulphoaluminate cement by utilizing cyanide tailings, which is carried out according to the following steps: (1) Prepare cyanide tailings, lime and aluminum materials as raw materials, add or not add mineralizers, and make a mixed material ; (2) high temperature sintering with high temperature kiln to obtain sintered clinker; (3) cooling to normal temperature with cooling kiln, and cement grinding treatment to make sulphoaluminate cement. The method of the invention has a good effect of removing cyanide, and the cyanide breaking rate reaches over 99%. The sulphoaluminate cement after high-temperature sintering is high-strength rapid-hardening cement, which can fully meet the amount of cement used for infrastructure and backfilling of gold ore enterprises.

Description

technical field [0001] The invention relates to the fields of nonferrous metal metallurgy technology and environmental protection technology, in particular to a method for preparing sulphoaluminate cement by using cyanide tailings. Background technique [0002] Because gold mines use cyanide gold extraction technology in the production process, a large amount of cyanide tailings will be produced, and these cyanide tailings contain a large amount of pollutants, such as sulfur, copper, arsenic, mercury and highly toxic cyanide . Except for a small amount of cyanide tailings that can be used, a considerable amount of cyanide tailings is only stored and disposed of, which not only occupies a large amount of land resources, but also has the hidden danger of polluting surface water, groundwater and soil, and has great impact on the surrounding environment. Big potential safety hazards and environmental protection hazards; at present, cyanide tailings have been listed by the count...

AI Technical Summary

Problems solved by technology

Except for a small amount of cyanide tailings that can be used, a considerable amount of cyanide tailings is only stored and disposed of, which not only occupies a large amount of land resources, but also has the hidden danger of polluting surface water, groundwater and soil, and has great impact on the surrounding environment. Big potential safety hazards and environmental protection hazards; at present, cyanide tailings have been listed by the country as HW33 hazardous waste in the "National Hazardous Waste List", with obvious pollution characteristics and serious pollution. Practical control technologies to eliminate the environmental hazards of such hazardous wastes

[0003] At present, the technology for treating cyanide tailings is mainly flotation method, supplemented by autoclave method, chlorination roasting method, molten salt roasting method, reduction roasting method, oxidation method, solidification method, preparation of Portland cement, To prepare bricks and blocks, etc., the flotation method (CN201410228170.5, CN201410099597.X, CN201510055236.X) is mostly carried out under weak acid conditions. - Unstable, resulting in bad working environment, and need to undergo multiple flotation treatments; autoclave method (CN201510023812.2) is mainly carried out in autoclave or autoclave, which requires long-term high temperature and pressure maintenance, and needs to deal with the pressure brought by autoclave. secondary pollution; the chlorination roasting method (CN201410317041.3, CN201410757942.4) is mainly a method of mixing chlorination agents and cyanidation tailings with high-temperature roasting, which requires high anti-corrosion capabilities of equipment and high energy consumption; The salt roasting method (CN201410317042.8, CN201611121854.0) uses molten salt or molten pool to roast cyanide slag, the roasting temperature is higher, and the time is longer; the reduction roasting method (CN201610825331.8, CN201610846576.9) uses a reducing agent in Reduction at high temperature takes a long time; the oxidation method (CN201711048319.1) uses ozone, hydrogen peroxide, sodium hypochlorite and other oxidants to oxidize the cyanide tailings, and the operating cost is high; the curing method (CN201710628397.2) uses a curing agent to solidify the cyanide residue , but it cannot fundamentally solve the possible environmental pollution caused by cyanide tailings; preparation of Portland cement (CN201210002870.3, Kong Yapeng-Research on the comprehensive utilization of valuable elements in cyanide tailings [D]. Northeastern University, 2014 ), using cyanide tailings with high aluminum and silicon content to prepare ordinary Portland cement; preparing bricks (CN201110116703.7, Zhu Mincong, etc., research on the technology of making building materials autoclaved bricks from gold mine tailings[J]. Comprehensive utilization, 2008 (1): 43-46, CN200410036554.3) Autoclaved bricks, permeable bricks and concrete blocks are prepared by using cyanide tailings, active agents, additives, etc., which require high temperature and long-term autoclaving or cyanide damage Incomplete and other issues

[0004] These existing methods either have high energy consumption or are accompanied by secondary pollution or incomplete cyanide breaking or complex process, and high operating costs; , reasonable and effective treatment

Images